Stainless steel in the past 20 years, the world’s stainless steel pipe production has developed greatly, technology and equipment levels have improved greatly, in recent years in the new and expanded stainless steel seamless pipe workshop, welded pipe workshop and cold rolling cold drawing workshop, there are many fruitful new technology and efficient new equipment. China’s stainless steel pipe production after more than 40 years of development, especially in the past 20 years, both stainless steel seamless pipe or welded pipe production technology has made great progress, production, quality and variety continue to increase and improve the quality of a few products to reach the international advanced level.

The following will lead you to understand the material types and uses of stainless steel tubes.

A, the classification of stainless steel pipe

1, according to the production method: seamless tube – cold-drawn tube, extruded tube, cold-rolled tube. Welded pipe: (a) classification by process – gas shielded welded pipe, electric arc welded pipe, resistance welded pipe (high frequency, low frequency). (b) according to the welding seam – straight seam welded pipe, spiral welded pipe.

2, classified by section shape: round steel pipe; rectangular pipe.

3, classified by wall thickness: thin-walled steel pipe, thick-walled steel pipe

4, classified by use: civil tube: round, rectangular, flower tube, generally used for decoration, construction, structure, etc..

Industrial pipe: industrial piping with steel pipe, general piping with steel pipe (drinking water pipe), mechanical construction / fluid transfer tube, boiler heat exchange tube, food sanitation tube, etc. Generally used in various fields of industry such as: petrochemical, paper, nuclear energy, food, beverage, pharmaceutical and other industries with high requirements for fluid media pipeline.

Second, stainless steel pipe material distinction

1, the concept of steel: steel is ingot, billet or steel through pressure processing into the various shapes, sizes and properties of the materials we need. Steel is an important material essential to national construction and the realization of the four, stainless steel pipe materialization is widely used, a wide variety, according to the different shapes of the section, steel is generally divided into four categories of profiles, plates, pipes and metal products, in order to facilitate the organization of steel production, order supply and good management, and is divided into heavy rail, light rail, large sections, medium-sized sections, small sections, steel cold-formed steel, steel. High-quality sections, wire rod, medium-thick steel plate, thin steel plate, electrical silicon steel sheet, strip steel, seamless stainless steel pipe steel, welded stainless steel pipe, metal products and other varieties.

2, steel production methods: most steel processing is steel through pressure processing, stainless steel tube materialization points to make the processed steel (billet, ingot, etc.) plastic deformation. According to the steel processing temperature steel is divided into two types of cold processing and hot processing.

The main processing methods of steel are: rolling – the steel metal billet through the gap between a pair of rotating rolls (various shapes), due to the compression of the rolls to reduce the cross-section of the material, the length of the pressure processing method to increase, which is the most common way of producing steel production, mainly used to produce steel profiles, plates, tubes. Divided into cold rolling and hot rolling.

Forging steel: the use of forging hammer reciprocating impact or press pressure to change the billet into our desired shape and size of a pressure processing method. Generally divided into free forging and die forging, commonly used for the production of large materials, open billets and other cross-sectional steel size of larger materials.

Pulling steel: is already rolled metal billet (type, tube, products, etc.) through the die hole pulling into a cross-sectional reduction in length increase processing methods mostly used for cold processing.

Extrusion: is the steel metal in the closed extrusion Jane, one end of the pressure, so that the metal from the specified die hole extrusion and get the same shape and size of the finished product processing methods, mostly used in the production of non-ferrous metal steel.

Three, the use of stainless steel pipe

1, seamless steel pipe stainless steel: seamless steel pipe is a long steel with a hollow cross-section, no seams around.

Manufacturing process and process of seamless steel pipe: smelting > ingot > rolling > sawing > peeling > perforation > annealing > pickling > ash > cold drawing > cutting head > pickling > storage

Characteristics of seamless steel pipe: From the above process we can easily see that, first, the thicker the wall thickness of the product, the more economical and practical it is, the thinner the wall thickness, its processing costs will rise significantly; second, the product’s process determines its limitations, the general seamless steel pipe low precision, uneven wall thickness, low brightness of the tube appearance, the high cost of sizing, and the internal and external appearance of the pockmarks, black spots are not easy to Third, its detection and shaping must be processed offline. Therefore, it reflects its superiority in high pressure, high strength, mechanical structure materials.

2, welded steel pipe: welded steel pipe for short, is a steel pipe made of steel plate or steel strip after the unit and mold curling and forming welded.

The manufacturing process and process of welded steel pipe: steel plate > slitting > forming > solution jointing > induction bright heat treatment > internal and external welding channel treatment > shaping > sizing > eddy current detection > laser sizing > pickling > storage

Characteristics of welded steel pipe: From the above process flow we can easily see: one, the product is a continuous online production, the thicker the wall thickness, the larger the investment in the unit and dissolving equipment, the less economical and practical it is. The thinner the wall thickness, its input-output ratio will drop accordingly; secondly, the process of the product determines its advantages and disadvantages, general welded steel pipe with high precision, uniform wall thickness, high brightness of the tube appearance (the surface grade of the steel plate determines the surface brightness of the steel pipe), can be arbitrarily sized. Therefore, it reflects its economy and beauty in high-precision, low and medium pressure fluid applications.

Stainless Steel Pipes
Galvanized Steel Pipes
Seamless Steel Pipes
Welded Steel Pipes

3 inch galvanized pipe

3.5 inch steel pipe

6mm steel tubing

Epoxy powder anti-corrosion steel pipe for water transmission is coated with epoxy powder on the surface of the steel pipe by electrostatic spraying process, and the film is formed once. The coating has the advantages of easy coating operation, no pollution, good impact and bending resistance, high temperature resistance, etc. 2PE/3PE anti-corrosion 2PE/3PE anti-corrosion structure: electrostatic spraying epoxy powder on the surface of steel pipe and lateral winding adhesive, lateral winding polyethylene anti-corrosion layer, combining the excellent performance of the three, thus significantly improving the overall quality of anti-corrosion pipeline. With chemical corrosion resistance, cathodic stripping resistance, resistance to mechanical damage performance.

Epoxy coal asphalt anti-corrosion epoxy coal asphalt anti-corrosion structure: made of epoxy resin + coal tar asphalt + filler anti-corrosion coating on the surface of the steel pipe with glass cloth as a reinforcement coating to form an anti-corrosion layer, commonly used in the outer wall of the pipe anti-corrosion. Thickness is generally 0.5 ~ 1.0mm. epoxy fusion powder anti-corrosion FBE/2FBE service life: 40 years to 50 years after the high-density polyethylene jacket anti-corrosion high-density polyethylene jacket anti-corrosion structure: in the outer surface of the steel pipe wrapped with high-density polyethylene material made, has a very high mechanical strength and excellent corrosion resistance, can protect the steel pipe in transport, installation and use process to avoid damage caused by external factors. damage caused by external factors during transportation, installation and use.

Epoxy powder anti-corrosion steel pipe for water transmission

Epoxy powder anti-corrosion steel pipe for water transmission: epoxy powder is a thermosetting, non-toxic coating, after curing to form a high molecular weight cross-linked structure coating, with excellent chemical anti-corrosion properties and high mechanical properties, especially wear resistance and adhesion. The coating is 100% solid, solvent-free, non-polluting, powder utilization rate of up to 95% or more, is a high-quality anti-corrosion coating for buried steel pipelines.

Epoxy powder composition: The basic characteristics of the mixture of epoxy resin, curing agent, pigments and additives required in the preparation of powder coatings, the physical and chemical properties of the mixture will exert some kind of influence. Firstly, the resin system must have the ability to wet the pigments and fillers to produce a minimal reaction between the resin and curing agent under conditions of temperature and time.

The production of a homogeneous quality product must be able to generate a powder of the required particle size with relative ease; the powder must remain fluid, have no bonding or agglomeration during transport and storage, and not react under these conditions. The most common application is electrostatic, so the powder particles must have the ability to carry an electric charge. When heated, the powder must melt and flow into a smooth continuous film. The substrate is wetted and cured under baking, and the coating obtained in this production process has the required mechanical chemical resistance.

Welded Steel Pipes

Product Recommendation:

4 inch stainless pipe

3 inch round steel pipe

3.5 inch steel tubing

The use of epoxy powder anti-corrosion steel pipe is so large that it has been spread all over the world, from the force of land to sea, from plains to mountains, rivers, lakes, from the Siberian steppe to the African desert, from the American continent to the Middle East Gulf, these are examples of the application of fusion bonded epoxy powder.

China’s largest project “West-East gas transmission” is the use of epoxy powder anti-corrosion steel pipe, making heavy anti-corrosion epoxy powder coating in China has a long development. Heavy anti-corrosion fusion bonded epoxy powder coating can be divided into: powder for pipeline internal spraying, powder for pipeline external spraying, powder for oil drilling pipe, and powder for three-layer structure anti-corrosion. Double-layer fusion bonded epoxy powder anti-corrosion steel pipe.
Epoxy powder anti-corrosion steel pipe

Tianxiangcheng pipeline can undertake steel pipeline single and double fusion bonded epoxy powder (FBE), double polyethylene (2PE) and three layers of polyethylene (3PE), double poly (2PP), and three layers of poly (3PP), epoxy coal asphalt a cloth three oil or (two cloth four oil) steel pipe anti-corrosion, polyurethane prefabricated direct buried insulation pipe, black and yellow jacket insulation pipe, IPN8710 polymer non-toxic epoxy anti-corrosion, inside and outside Spraying epoxy series steel pipe anti-corrosion, interpenetrating network coating epoxy resin anti-corrosion, high-density polyethylene anti-corrosion, steel pipe inner wall cement mortar lining anti-corrosion, steel-plastic composite pipe, plastic-lined cold water with steel pipe, plastic-lined hot water with steel pipe, steel pipe outside galvanized inside plastic-lined anti-corrosion, sanitary standard plastic-lined anti-corrosion, anti-corrosion pipe fittings, steel pipe anti-corrosion series of coatings, prefabricated direct buried pipe insulation anti-corrosion, etc. The company produces a variety of anti-corrosion coatings, the main products are IPN8710 polyurethane polyethylene anti-corrosion coating, epoxy coal bitumen anti-corrosion coating, solvent-free epoxy resin anti-corrosion coating; can undertake the inner wall of steel pipe, the outer wall of epoxy coal bitumen a cloth three oil or (two cloth four oil) steel pipe anti-corrosion, steel pipe inner wall cement mortar lining anti-corrosion pipe, IPN8710 anti-corrosion processing. The company has advanced process equipment and complete testing means. With advanced testing equipment, we have established a perfect quality assurance system and passed the ISO9001:2000 international quality system certification. Our products are widely used in oil pipelines, natural gas pipelines, urban heating pipelines, water supply pipelines, electric power and other anti-corrosion projects. We have participated in the completion of many long-distance oil, gas and water pipeline anti-corrosion and insulation projects in China, and also participated in the completion of pipeline anti-corrosion projects for export to Indonesia, Sudan, Saudi Arabia and South Africa, and the quality of our products and services have been well received by our customers.

Seamless Steel Pipes

Recommended Products:

201 stainless steel tube

schedule 40 316 stainless steel pipe

2 inch schedule 40 galvanized pipe

In the epoxy powder anti-corrosion steel pipe production operation process, if the operation process is inappropriate method, then the production of epoxy powder anti-corrosion steel pipe to do anti-corrosion again, greatly reducing the efficiency of 3PE epoxy powder anti-corrosion steel pipe is no exception.

Industry stakeholders understand that the current factors affecting the performance of 3PE epoxy powder anti-corrosion steel pipe layer is still more, such as the layout of the process, equipment selection, surface quality, heating, coating temperature, cooling, transmission accuracy, material characteristics and testing, etc., poor control will lead to small coating adhesion, too thin, cracking or bubbles and other defects, the strict implementation of norms and scientific methods of operation is essential to control defects and ensure the yield of anti-corrosion pipe.

Epoxy powder anti-corrosion steel pipe

On the 3PE epoxy powder anti-corrosion steel pipe anti-corrosion quality, countries are different methods, announced a steel pipe external ring cooling device, cooling effect has improved, but still can not fundamentally overcome the quality defects and weld coating thickness thinning caused by external cooling methods.

It is pointed out that the ideal method to reduce the coating thickness thinning is to cool from the inside of the tube. And the relevant U.S. patent US6270847B1 discloses a steel pipe anti-corrosion internal cooling method, which is put into the pump inside the steel pipe, spraying water to the inner wall of the steel pipe during the rotation of the steel pipe, the cooling sequence of the steel pipe and anti-corrosion layer is: steel pipe, FBE layer, adhesive layer and PE layer. The heat transfer rate of steel pipe is fast, so that the steel pipe and coating can be cooled quickly, and because the cooling process of the anticorrosive layer is from the inside out, the anticorrosive layer is better bonded to the pipe wall when cooling and shrinking, the circumferential stress of the anticorrosive layer is very small, and the thinning of the anticorrosive layer on the weld path is very small, thus improving the quality of anticorrosive and reducing the cost of raw materials. But this internal cooling method is more difficult to achieve.

Stainless Steel Pipes

Recommended Products:

galvanized pipe 3 inch

3.5 sch 40 pipe

6mm stainless steel tubing

 

Plastic coated composite anti-corrosion steel pipe is divided into: hot dipping process, internal and external spraying process, rotomolding process, drenching process, suction coating process, fusion bonding winding process, etc.

Hot dipping using: fluidized bed dipping, one-time film-forming method. Also known as the first generation of plastic coated steel pipe anti-corrosion, inside and outside polyethylene.

Inside and outside spraying process: the use of electrostatic adsorption theory, through the steel pipe pretreatment, spraying polyethylene or epoxy resin powder with a spray gun. Also known as plastic coated steel pipe second generation of anti-corrosion, internal and external epoxy composite steel pipe.
Drenching process: also known as curtain method, through the sieve containing powder using the drenching method, coated on the outer wall of the heated steel pipe.

This process can be produced outside polyethylene within the epoxy composite steel pipe. Also known as plastic coated steel pipe third generation of anti-corrosion.

Fused knot winding process: using the hot knot winding method, hot melt adhesive and polyethylene in the form of extruder winding on the heated steel pipe, the reaction to form a three-layer structure, the full name is fused epoxy / extruded polyethylene structure protection layer.

This process can produce outer three-layer structure polyethylene inner fusion bonded epoxy composite steel pipe. Also known as plastic coated steel pipe fourth generation of anti-corrosion

Tianxiangcheng pipeline can undertake steel pipeline single and double fusion bonded epoxy powder (FBE), double polyethylene (2PE) and three layers of polyethylene (3PE), double poly (2PP), and three layers of poly (3PP), epoxy coal asphalt a cloth three oil or (two cloth four oil) steel pipe anti-corrosion, polyurethane prefabricated direct buried insulation pipe, black and yellow jacket insulation pipe, IPN8710 polymer non-toxic epoxy anti-corrosion, inside and outside Spraying epoxy series steel pipe anti-corrosion, interpenetrating network coating epoxy resin anti-corrosion, high-density polyethylene anti-corrosion, steel pipe inner wall cement mortar lining anti-corrosion, steel-plastic composite pipe, plastic-lined cold water with steel pipe, plastic-lined hot water with steel pipe, steel pipe outside galvanized inside plastic-lined anti-corrosion, sanitary standard plastic-lined anti-corrosion, anti-corrosion pipe fittings, steel pipe anti-corrosion series of coatings, prefabricated direct buried pipe insulation anti-corrosion, etc. The company produces a variety of anti-corrosion coatings, the main products are IPN8710 polyurethane polyethylene anti-corrosion coating, epoxy coal bitumen anti-corrosion coating, solvent-free epoxy resin anti-corrosion coating; can undertake the inner wall of steel pipe, the outer wall of epoxy coal bitumen a cloth three oil or (two cloth four oil) steel pipe anti-corrosion, steel pipe inner wall cement mortar lining anti-corrosion pipe, IPN8710 anti-corrosion processing. The company has advanced process equipment and complete testing means. With advanced testing equipment, we have established a perfect quality assurance system and passed the ISO9001:2000 international quality system certification. Our products are widely used in oil pipelines, natural gas pipelines, urban heating pipelines, water supply pipelines, electric power and other anti-corrosion projects. We have participated in the completion of many long-distance oil, gas and water pipeline anti-corrosion and insulation projects in China, and also participated in the completion of pipeline anti-corrosion projects for export to Indonesia, Sudan, Saudi Arabia and South Africa, and the quality of our products and services have been well received by our customers.

galvanized pipes manufacturers

Recommended Products:

3.5 galvanized pipe

3 inch diameter steel pipe

6mm steel tubing

schedule 80 steel pipe for sale

 

Seamless steel pipe is made from ingots or solid billets that are perforated to form a burr tube, and then hot rolled, cold rolled or cold dialed. 45 seamless steel pipe is one of the materials of steel and is a high quality carbon structural steel, which is used by a large number of mold production companies to make mold steel. Seamless steel pipe is made of high quality carbon steel or alloy steel and is available in hot rolled and cold rolled (drawn). Welded steel pipe is rolled into a tube-shaped steel plate to butt or spiral seam welding, in the manufacturing method, and is divided into low-pressure fluid transmission with welded steel pipe, spiral seam electric welding steel pipe, direct coil welding steel pipe, electric welding pipe, etc.. Seamless steel pipe can be used for various liquid and gas pipelines, etc. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, etc. From the caliber, <φ76, accounting for 35%, <φ159-650, accounting for 25%. In terms of varieties, 1.9 million tons of general purpose pipes, accounting for 54%; 760,000 tons of petroleum pipes, accounting for 5.7%; 150,000 tons of hydraulic pillar and precision pipes, accounting for 4.3%; 50,000 tons of stainless steel pipes, bearing pipes and automobile pipes, accounting for 1.4%.

The raw material for rolling seamless steel pipe is a round pipe billet. The round pipe embryo is cut and processed into a billet of about 1 meter in length by a cutting machine and sent to the furnace for heating by a conveyor belt. The billet is sent to the furnace to be heated at a temperature of about 1200°C. The fuel is hydrogen or acetylene. Temperature control in the furnace is a key issue. After the round billet is discharged from the furnace, it is hollowed out by a pressure piercing machine. The more common perforating machine is the conical roller perforating machine, which has high productivity, good product quality, large perforation and expansion capacity, and can perforate a variety of steel grades. After perforation, the round pipe billet has been three rolls of oblique rolling, continuous rolling or extrusion. After extrusion, the tube should be sized. Sizing machine through the conical drill bit high-speed rotation into the steel embryo perforation, the formation of steel pipe. The inner diameter of the steel pipe is determined by the length of the outer diameter of the sizing machine bit. After sizing, the steel pipe enters the cooling tower and is cooled by water spray, and after cooling, the steel pipe is straightened. Steel pipe is straightened and sent by conveyor belt to the metal flaw detector (or hydraulic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. The steel pipe quality inspection is followed by a strict hand selection. After quality inspection, the steel pipe is sprayed with paint with number, specification, production lot number, etc. and lifted into the warehouse by crane.

Specification: The specification of seamless steel pipe is expressed by the number of millimeters of outer diameter * wall thickness. φ:756MM; wall thickness: 100MM or less

Classification of seamless steel pipe: Seamless steel pipe is divided into two categories: hot rolled and cold rolled (dialed) seamless steel pipe.

Seamless steel pipe execution standards

Structural steel pipe GB/T8162-99 Oil drilling steel pipe YB528-65 Fluid steel pipe GB/T8163-99

Marine steel pipe GB5312-85 medium-pressure boiler steel pipe GB/T3087-99 petroleum jacket steel pipe API5CT

Geological drilling steel pipe YB235-70 Automotive semi-axial steel pipe GB3088-8 Chemical fertilizer steel pipe GB6479-86

Hydraulic pillar steel pipe GB173-98 Petroleum cracking steel pipe GB9948-88 Pipeline steel ASTMA53B/106B/API 5L B High-pressure boiler steel pipe DIN17175 ST45.8-Ⅲ GB5310-95 20G

Seamless steel pipe is rolled from solid billets after perforation.

Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes, etc.

Cold rolled (dialed) seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipe, but also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, stainless thin-walled steel pipe, shaped steel pipe. Hot-rolled seamless steel pipe outer diameter is generally greater than 32mm, wall thickness 2.5-75mm, cold-rolled seamless steel pipe diameter can be up to 6mm, wall thickness can be up to 0.25mm, thin-walled tube outer diameter can be up to 5mm, wall thickness is less than 0.25mm, cold-rolled than hot-rolled high dimensional accuracy.

Seamless steel pipe for general use: It is made of 10, 20, 30, 35, 45 and other high quality carbon knotted steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled. 10, 20 and other low carbon steel made of seamless steel pipe is mainly used for fluid transportation pipeline. 45, 40Cr and other medium carbon steel made of seamless steel pipe Used to manufacture mechanical parts, such as cars, tractors of stressed parts. Seamless steel tubes are generally used to ensure strength and crush test. Hot-rolled steel pipe is delivered in hot-rolled condition or heat-treated condition; cold-rolled is delivered in heat-treated condition.

Seamless steel tubes for low and medium pressure boilers: used for manufacturing various low and medium pressure boilers, superheated steam tubes, boiling water tubes, water-cooled wall tubes and superheated steam tubes for locomotive boilers, large smoke tubes, small smoke tubes and arch brick tubes, etc. Hot-rolled or cold-rolled (dialed) seamless steel tubes made of high-quality carbon structural steel. Mainly made of 10, 20 gauge steel, in addition to ensuring the chemical composition and mechanical properties to do the hydraulic test, rolled edge, flaring, flattening and other tests. Hot-rolled to hot-rolled state delivery, cold-rolled (dial) to heat treatment state delivery.

High-pressure boiler steel pipe: mainly used to manufacture high-pressure and above-pressure steam boiler pipes with high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipe, these boiler tubes are often in high temperature and high pressure work, the tube in the role of high-temperature flue gas and water vapor will also be oxidation and corrosion, so the steel pipe is required to have a high lasting strength, high oxidation resistance, and has good organizational Stability, the use of steel grades are: high-quality carbon structural steel grades 20G, 20MnG, 25MnG; alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb 1Cr18Ni11Nb high-pressure boiler tube in addition to ensure the chemical composition and mechanical properties, to do the hydraulic test one by one, to make the flaring, flattening test. Steel tube to heat treatment state delivery. In addition, the finished steel pipe microstructure, grain size, decarburization layer also have certain requirements.

Seamless steel pipe for geological drilling and petroleum drilling: To find out the underground rock structure, groundwater, oil, natural gas and mineral resources, drilling rigs are used to drill wells. Oil and natural gas extraction is even more inseparable from drilling, and seamless steel pipes for geological drilling and oil drilling are the main equipment for drilling, mainly including core outer pipe, core inner pipe, casing, drill pipe, etc. As the pipe for drilling has to work deep into the stratigraphic depth of several thousand meters, the working conditions are extremely complicated, and the drill pipe is subjected to stresses such as tension, pressure, bending, torsion and unbalanced impact load, as well as mud and rock abrasion, so the pipe must have sufficient strength, hardness, wear resistance and impact toughness. (geological Hanyu Pinyin prefix) plus the number one represents the steel yield point, commonly used steel number DZ45 45MnB, 50Mn; DZ50 40Mn2, 40Mn2Si; DZ55 40Mn2Mo, 40MnVB; DZ60 40MnMoB, DZ65 27MnMoVB. steel tubes are delivered in heat-treated condition.

Petroleum cracking pipe: Seamless steel pipe for furnace pipe, heat exchanger pipe and pipeline in petroleum refineries. Commonly used high-quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. In addition to the chemical composition and various mechanical properties of the steel pipe, but also to ensure the hydraulic pressure, flattening, flaring and other tests, and surface quality and non-destructive testing. Steel tubes are delivered in heat-treated condition. Stainless steel pipe: with a variety of stainless steel hot-rolled, cold-rolled stainless steel pipe, widely used in petroleum, chemical equipment pipelines and various uses of stainless steel structural parts, in addition to the chemical composition and mechanical properties should be guaranteed, where used to withstand fluid pressure of the steel pipe to ensure that the hydraulic test qualified. A variety of special steel pipe to ensure the conditions as specified.

It is true that galvanized steel pipes are actually ordinary welded steel pipes that have been galvanized. However, due to the different production processes, galvanized steel pipes are also differentiated by type.

For example, the order of galvanizing and processing is different, giving rise to two different products, and the price of galvanized steel pipe may also be different.

Galvanized steel pipe

Galvanized steel strip is produced by first galvanizing steel raw materials and then post-processed to produce a steel pipe called galvanized strip steel pipe, also called pre-galvanized steel pipe.

The raw steel material is first produced into a common steel pipe with the required welded steel pipe specifications, and then galvanized. The galvanized steel pipe produced in this way is called hot-dip galvanized steel pipe, also known as hot-dipped galvanized steel pipe.

There is a big difference in the price of these two types of galvanized steel pipes, with galvanized strip steel pipes being much cheaper than hot-dip galvanized steel pipes. This is due to the fact that in terms of zinc layer thickness, the steel pipe produced by the hot-dip galvanizing process will be thicker and have a stronger corrosion resistance.

However, many customers still tend to buy pre-galvanized steel pipes when they ask for quotations to buy galvanized square pipes. Not only because of the cheap price, but also because on the basis of the price, there is not much difference between the use and the hot-dip galvanized steel pipe.

However, it is important to note that if you need a steel pipe with a relatively high wall thickness, such as requiring a wall thickness of 2.5mm or more. Then the steel pipe manufacturer will default to your request for a hot dipped galvanized steel pipe. This is because the raw material for pre-galvanized steel pipes, galvanized strip steel, cannot meet such wall thickness conditions.

In other words, under the same conditions of use, people will use the cheaper pre-galvanized steel pipe and choose the hot-dipped galvanized steel pipe in special cases. The characteristics of these two types of galvanized steel pipes must be distinguished.

3.5 galvanized pipe,galvanized steel pipe factory,

We are currently the second largest consumer of electricity in the world, with the installed capacity of electricity increasing from 520 million kilowatts in 2005 to 1,144 million kilowatts in 2012, with an average annual growth rate of 11.97%. As a country with more coal and less gas and oil, coal-fired power generation still dominates our total power generation capacity. According to BP’s World Energy Statistics Yearbook 2012, coal accounts for 70.39% of the primary energy consumption structure.

Currently, the installed thermal power generation capacity accounts for 71.59% of the total installed power generation capacity, and the installed thermal power generation capacity increased from 390 million kilowatts in 2005 to 819 million kilowatts in 2012, with an average annual growth rate of 11.18%.

Thermal power generation is a form of power generation that uses the thermal energy generated by burning coal to heat water, turning it into high-pressure water vapor, which then drives a generator to generate electricity. Thermal power plant mainly consists of three major parts: power generation boiler, steam turbine and generator, in which the steam and water pipes in power generation boiler include reheater pipe, superheater pipe, water cooling wall pipe, coal saver pipe, air preheating pipe, heat conduction pipe, descending pipe and various joint box pipes. Due to the use of the above-mentioned pipeline in high temperature and high pressure conditions for a long time, the pipeline will be oxidation and corrosion under the action of high-temperature flue gas and water vapor, so the requirements of steel pipe with high lasting strength, high oxidation resistance corrosion performance and good organizational stability. To meet the above requirements, stainless steel tubes are used in large numbers in thermal power boilers. China’s thermal power unit investment has driven the development of stainless steel tubes for the power equipment manufacturing industry.