Stainless steel pipe S31803

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S31803 dual phase stainless steel is composed of 21% chromium, 2.5% molybdenum and nickel nitrogen form 4.5% duplex stainless steel alloy. It has high strength, good toughness and good overall and local stress corrosion resistance. The yield strength of S31803 duplex stainless steel is two times that of austenitic stainless steel, this feature enables designers to reduce weight in the design of products, let this alloy has a price advantage than 316317L. This alloy is particularly applicable to -50 degrees F/+600 degrees F temperature range. Beyond this temperature range of applications, also can consider this kind of alloy, but there are some limitations, especially when used in welding structure.

The characteristics of S31803 duplex stainless steel:

1.S31803 dual phase stainless steel and austenitic stainless steel 316L and 317L compared, S31803 properties of dual phase steel in the resistance to pitting and crevice corrosion is more superior, it has very high corrosion resistance of austenite, and compared, its lower thermal expansion coefficient, high thermal conductivity.

2.S31803 dual phase stainless steel and austenitic stainless steel are compared, the compressive strength is two times, compared with 316L and 317L, the designer can reduce the weight. Alloy 2205 is particularly applicable to - 50 degrees F/+600 degrees F temperature range, in a strictly limited circumstances (especially for welding structure), can also be used to lower the temperature.

Chemical composition: C = 0.030, Mn = 2 Si = 1, P = 0.030 S = 0.020 Cr and 22 ~ 23 Ni and 4.5 ~ 6.5 Mo3.0 ~ 3.5 N0.14 ~ 0.20 (austenite and ferrite)

S31803 dual phase stainless steel applications:

Pressure vessels, pressure tanks, high pressure pipe, heat exchanger (chemical processing industry).

Petroleum natural gas pipeline, the heat exchanger tubes.

And the sewage treatment system.

And the pulp and paper industry classifier, bleaching equipment, storage and processing system.

High strength corrosion environment of the rotary shaft, impeller blades, press roller, etc..

Cargo tank, ship or truck

And food processing equipment

S31803 dual phase stainless steel standard:

ASTM/ASME..A240 UNS S32205/S31803...

EURONORM..1.4462 X2CrNiMoN 22.5.3...

AFNOR....Z3 CrNi 22.05 AZ

DIN....W. Nr 1.4462

S31803 dual phase stainless steel corrosion resistance:

Uniform corrosion

Because the chromium content (22%), Mo (3%) and nitrogen content (0.18%), 2205 of the properties of corrosion resistance is better than that of 316L and 317L in most environments.

Local corrosion

The content of chromium, molybdenum and nitrogen S31803 duplex stainless steel in the oxidizing and acidic solution, has a strong ability to resist corrosion and crevice corrosion.

Stress corrosion resistance

Dual phase microstructure of stainless steel is helpful to improve the resistance of the stainless steel stress corrosion cracking ability. At a certain temperature, oxygen tension exists, and the absence of chloride, austenitic stainless steel will happen to chloride stress corrosion. Because of these conditions is not easy to control, so the use of 304L, 316L and 317L are limited in this respect.

Corrosion fatigue

High strength and corrosion resistance of S31803 duplex stainless steel which has high resistance to corrosion fatigue strength. Processing equipment susceptible to corrosion environment and cyclic loading, the characteristics of S31803 duplex stainless steel is very suitable for such applications.


Chemical composition of S31803 duplex stainless steel after 1900 degrees /1922 degrees F (1040 degrees /1080 degrees C) solution annealed microstructure can obtain ideal 50 alpha / 50 gamma. If the heat treatment temperatures above 2000 degrees F, may lead to an increase in the ferrite components. Like other dual phase stainless steel, alloy 2205 is easily affected by the intermetallic phase precipitation. Intermetallic phases at 1300 DEG F and 1800 DEG between F at 1600 DEG F precipitation, temperature, the precipitation of the fastest. Therefore, we need to conduct experiments on the S31803 duplex stainless steel, to ensure that no intermetallic phase, testing, reference ASTM A 923.

S31803 dual phase stainless steel processing

Hot forming

We suggest that should be carried out in the following 600 degrees F temperature forming. In hot forming processing, the workpiece should be heated, should be in 1750 degrees F to 2250 degrees F within the temperature range of 2205 alloy under this temperature, very soft. If the temperature is too high, easy to hot tearing 2205 alloy. Below this temperature, the austenite will be broken. Below 1700 degrees F, because of the influence of temperature and deformation, intermetallic will soon form. After hot forming, should be an immediate solution annealed to at least 1900 degrees F temperature, and quenching to restore its phase equilibrium, toughness and corrosion resistance. We do not recommend eliminating stress, but if you must do so, materials to be solution annealed at a minimum of 1900 degrees F temperatures, then rapidly cooling, water quenching.

Cold forming

S31803 dual phase stainless steel can be cut and cold forming. However, due to the high strength and hardness of 2205 alloy itself, it than austenitic steel is more need for cold forming, also because of its high strength, should give full consideration to the factors of springback.

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Q:304L stainless steel pipe can withstand 0.1MPA?
Stainless steel pipe is a kind of hollow long strip round steel, mainly used in petroleum, chemical, medical, food, light industry, machinery, instrument and other industrial pipeline and mechanical structure parts. In addition, the bending and torsional strength of the same weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also used to produce all kinds of conventional weapons, guns, shells and so on.
Q:304 stainless steel seamless tube weight how to calculate?
304 stainless steel is a common stainless steel material, the density of 7.93 g/cm3, the industry is also called 18/8 stainless steel. High temperature resistance of 800 degrees, with good processability, high toughness characteristics, widely used in industry and furniture decoration industry and food and medical industry.
Q:Ask experts, 304 stainless steel pipe why rust?
Stainless steel is not easy to rust and has a lot to do with the composition of stainless steel. In addition to iron, stainless steel contains chromium, nickel, aluminum, silicon and so on. General stainless steel chromium content is generally not less than 12%, high even up to 18%. Steel added elements such as chromium, can change the performance of the steel, such as the molecular structure of steel more uniform on the surface of the steel is more easily to form a layer of dense oxide protective film, thereby greatly improving the ability of corrosion-resistant stainless steel. Therefore, stainless steel can resist fire, water, acid, alkali and various solutions to its corrosion, not rust. The scientists found that the internal structure of the steel is more uniform, various components more closely linked to the corrosion of the more difficult the invasion, also attached to the surface with a layer of oxide film, like iron and steel to wear armor, was not naturally easy to rust.
Q:Why can't stainless steel tubes be cut with acetylene?
To know why stainless steel tubes cannot be cut by acetylene, we must first understand why carbon steel can be cut by oxygen acetylene flame
Q:What is the difference between the stainless steel tube and tube rolling
Stainless steel stands for material. According to the production process, steel pipe, sub welded pipe, hot rolled pipe, cold rolled pipe and cold drawn pipe. What you say should refers to the cold drawn pipe drawing. Pipe called cold drawn, round steel called cold drawn. Compared with these processes, cold drawing and cold rolling are close to each other. The accuracy is higher, because of the plastic deformation, the mechanical properties are better. The specific difference is that the cold rolling is less than the cold drawn processing track, the accuracy and surface roughness are higher, and the processing cost is high. Cold drawing hardness is high, processing cost is low, processing will be wasted.
Q:What is the welding of stainless steel?
Many welding methods, commonly used argon arc welding, less thermal stress, less molten metal elements, forming beautiful; the remaining manual arc welding, higher requirements can be used when laser welding
Q:What are the specifications of stainless steel decorative pipes?
For the steel to withstand the pressure to the hydraulic test to test its ability and quality, leakage, soaked or expansion for qualified does not occur at the prescribed pressure, some steel according to the requirement of standard or edge test, flaring test and flattening test.
Q:How can stainless steel and copper pipe be welded?
Prepare a brass wire cleaning flux of base metal 3/4 stainless steel tube 5/8 copper rust (specific parent material specification is not clear to me) welding tools
Q:Stainless steel heating oven tube after treatment is heating blue will not be red?
Unless they are not stainless steel, or they control the temperature of the heating tube, the continuous heating will be red, after all, the material has not changed. If the outside of the heating tube is ceramic, it won't be red.
Q:304 stainless steel pipe, 20*2 pressure, how many kilograms?
304 yield strength is 210 R=, thickness D=, outer diameter, P=210/20=10.5, MPa, 1MPa=10, KG, can withstand 105 kg.

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