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2205 duplex stainless steel seamless pipe has excellent mechanical properties and corrosion resistance, as well as a good welding line, and has a wide range of applications in the oil and gas industry, marine engineering, chemical industry and other industries. The length of the oil and gas pipelines laid with duplex stainless steel in the oil and natural gas industry has exceeded 850Km, most of which are 2205 duplex stainless steel seamless steel pipes. Due to the corrosive nature of the natural gas medium, the high-pressure pipelines used in the West-East Gas Pipeline Project are 2205 pairs. Phase stainless steel material.

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201 stainless steel welded pipe has the characteristics of acid resistance, alkali resistance, high density, no bubbles, no pinholes and so on. It is used to produce high-quality materials for various watch cases and watchband bottom covers. Mainly used to make decorative tubes, industrial tubes, and some shallow stretched products.

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202 stainless steel is one of the 200 series stainless steel, the national standard model is 1Cr18Mn8Ni5N.

202 stainless steel is widely used in building decoration, municipal engineering, highway guardrail, hotel facilities, shopping malls, glass handrails, public facilities and other places.

This is the most cost effective grade of steel. So the 202 Stainless Steel round bar Price is lower compared to other grades of stainless steels and all metallic products in general. There are different versions of the material with low carbon and high carbon content. 

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304 stainless steel has excellent corrosion resistance and good resistance to intergranular corrosion. For oxidizing acids, it is found in experiments that 304 stainless steel has strong corrosion resistance in nitric acid with a concentration ≤ 65% below the boiling temperature. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids. Stainless steel 304 seamless pipe is a versatile stainless steel material with stronger rust resistance than 200 series stainless steel materials. High temperature resistance is also better, as high as 1000-1200 degrees.

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The products conform to the national standard GB/T14976-2002 (stainless steel seamless pipe for fluid transportation), GB/T14975-2002 (stainless steel seamless pipe for structure), GB/T13296-91 (stainless steel seamless pipe for boiler and heat exchanger), finished products The factory has undergone strict testing and meets the technical index requirements of the national standard. Drinking water, chilled water, vacuum and compressed air pipes, but the main and branch pipes except for chilled water after entering the clean room use sanitary 304L stainless steel seamless pipes.

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Properties of 309S stainless Steel:

309 s corresponding Chinese brand is 0 cr23ni13, American standard S30908 (American AISI, ASTM) .corrosion resistance, heat resistance are better than 0 cr19ni9.309 s is containing sulfur free cutting stainless steel.

It is a variation of 309 stainless steel  with lower carbon content. It is applied to the occasion. Low carbon content is made in the heat affected zone near the weld in the precipitation of carbide to a minimum,which may result in precipitation of carbide stainless steel inter-granular corrosion in some environments (welding erosion)

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310S stainless steel seamless pipe, commonly known as 2520, is called 2520 because the CR content index is 25 and the NI content index is 20. It has good oxidation resistance and corrosion resistance.

310S is an austenitic chromium-nickel stainless steel with good oxidation resistance and corrosion resistance. Because of the higher percentage of chromium and nickel, 310S has much better creep strength, can work continuously at high temperatures, and has good high temperature resistance.

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It is a long steel with a hollow section and no joints on the periphery. Steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipes are lighter when the bending and torsion strength is the same. At present, steel pipes have been widely used for manufacturing.

First, the thicker the wall thickness of the stainless steel seamless pipe, the more economical and practical it is, and the thinner the wall thickness, the greater the cost of its processing;

Secondly, the process of stainless steel seamless pipe determines its limited performance. Generally, seamless steel pipes have low precision: uneven wall thickness, low brightness on the inside and outside of the pipe, high cost of sizing, and there are pits and black spots on the inside and outside that are not easy to remove;

Third, the inspection and shaping of stainless steel seamless pipes must be processed offline. Therefore, it embodies its superiority in terms of high-pressure, high-strength, and mechanical structural materials.

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Low temperature embrittlement---In a low temperature environment, the deformation energy of 316L stainless steel welded pipe is small. In a low temperature environment, the phenomenon that elongation and reduction of area decrease is called low temperature embrittlement. This low-temperature embrittlement occurs in most ferritic stainless steels.

Generally, boiler tubes are mainly used to make water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes, and arch brick tubes. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam tubes, etc. for high-pressure and ultra-high-pressure boilers.

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321 stainless steel seamless pipe is a hollow long round steel, widely used in petroleum, chemical, medical, food, light industry, mechanical instrumentation and other industrial pipelines and mechanical structural parts. In addition, when the bending and torsion strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also often used to produce various conventional weapons, barrels, shells, etc. 321 stainless steel seamless pipe is a steel pipe that is resistant to weak corrosive media such as air, steam, water, and chemical corrosive media such as acid, alkali, and salt. Also known as stainless acid-resistant steel pipe. The corrosion resistance of 321 stainless steel seamless pipe depends on the alloying elements contained in the steel. Chromium is the basic element for the corrosion resistance of stainless steel. When the chromium content in the steel reaches about 12%, the chromium reacts with the oxygen in the corrosive medium to form a very thin oxide film (self-passivation film) on the surface of the steel. , Which can prevent further corrosion of the steel matrix. In addition to chromium, the commonly used alloying elements of stainless steel seamless pipes include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various uses for the structure and performance of stainless.

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The 409L stainless steel has strong resistance to corrosion, high temperature and fatigue, and can realize the life and lightweight of exhaust system components.

With its excellent corrosion resistance, 409L stainless steel is suitable for prolonging the life of automobiles and lightening the weight of automobiles. As an environmentally friendly material for recycling, GM, Ford, Volkswagen, DaimlerChrysler and other major automobile manufacturers adopt 100% stainless steel in their exhaust systems.

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(1) When 409L steel crystallizes, the solid-liquid two-phase zone is very small, less than 30℃;

(2) There is almost no γ phase at high temperature.

The carbon content of 409L steel is very low, even if δ phase is present, the amount is very small.

Therefore, there is no significant impact on performance.

409L steel from high temperature to low temperature almost no α→γ phase transformation, so the grain is easy to grow up, there are thick ferrite structure, low strength, in continuous casting, after the slab is cut up, prone to bend phenomenon, affect the normal production.

The main problem during crystallization of 409L steel is the degradation of properties caused by coarse grain size≥192HB

Stainless steel 410S is produced in accordance with the American ASTM standard of stainless steel, equivalent to China's 1Cr13 stainless steel, S41000 (AISI, ASTM).

0.15% carbon, 13% chromium,410S stainless steel: good corrosion resistance, machinability, general purpose blade, valve type.

Heat treatment of stainless steel: solution treatment (℃) 800-900 slow cooling or 750 fast cooling

Advantage：

1) High strength;

2) Excellent machinability

3) Hardened after heat treatment;

4) Magnetic;

5) not suitable for harsh corrosive environment.

Application

General blade, mechanical parts, class 1 tableware (spoon, fork, knife, etc.).

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430 stainless steel is a general steel with good corrosion resistance. Its thermal conductivity is better than austenite, its thermal expansion coefficient is smaller than austenite, its heat resistance fatigue, and the addition of stabilized element titanium has good mechanical properties at the welding seam.

430 stainless steel for building decoration, fuel burner parts, household appliances, home appliances parts.

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SUS444 (00Cr18Mo2) is a ferritic stainless steel with ultra-low carbon and nitrogen content, 18% chromium and 2% molybdenum, and high corrosion resistance.The yield strength of 444 is equivalent to 1.5 times of carbon steel and 6 times of fiberglass steel. It has outstanding advantages in shock resistance, snow resistance, wind pressure resistance and impact resistance.

Small thermal expansion coefficient, the small unit is only 60% ~ 70% of chromium-nickel Olympic stainless steel, very suitable for hot expansion, cold shrinkage, thermal cycle conditions.

The steel has good plasticity and toughness and is suitable for drawing, rolling forming and stamping manufacturing.

Especially the application of corrosion resistance is the most excellent, in the high chloride medium corrosion resistance is better than ordinary ferrite stainless steel and Olympic stainless steel, generally do not produce chloride stress corrosion cracking.

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904L (N08904,,14539) super austenitic stainless steel contains 14.0-18.0% chromium, 24.0-26.0% nickel, 4.5% molybdenum.

It has good activation - passivation conversion ability, excellent corrosion resistance, in non-oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid has good corrosion resistance, in neutral medium containing chloride ion has good pitting resistance, and has good crack corrosion resistance and stress corrosion resistance.

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