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:Why can stainless steel pipes be welded by argon arc welding?
The arc welding of argon arc welding has the advantages of stable combustion, concentrated heat, high temperature of the arc column, high welding efficiency, narrow heat affected zone, and little stress, deformation and crack tendency of the weldment;
Q:Stainless steel pipes can not be less than the amount of chromium
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. Why is stainless steel rust? When the stainless steel tube surface appear brown rust (point) when people are surprised: stainless steel does not rust, rust is stainless steel, steel may be a problem. In fact, this is a lack of understanding of stainless steel one-sided misconceptions. Stainless steel will rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation - that is, stainless steel, and also has the ability to corrode in medium containing acids, alkalis, and salts - that is, corrosion resistance. But its corrosion resistance is changed with the chemical composition, the mutual state, the condition of use and the type of environmental medium.
Q:Stainless steel pipe specification 25*2 what does it mean?
Outside diameter 25MM, wall thickness 2MM, this tube is too thick, our company has thin wall stainless steel tube
Q:What's the difference between the stainless steel pipe welded pipe and seamless pipe?
Seamless tube is a strip of steel with a hollow cross section and no seams at all. The general is rolled into a cylindrical tube plate welding.
Q:Why does the 304 stainless steel pipe leak?
Chloride poisoning. Why chlorine is found in tap water is not explained here.
Q:Stainless steel pipe pickling ratio
Usage: apply proper amount of this product onto the surface of stainless steel to be processed, the thickness of 1~2 mm, 5-30 minutes or longer (by dirt, sheet materials and processing requirements), process the best brush a few times, the surface oxide skin, rust completely clean, with water (lime water or salt water better) rinse, avoid rust.
Q:Is food grade stainless steel GB9684 304?
You can't say that.GB9684 is the implementation of standards, 304 is a material of stainless steel, stainless steel material is very much, such as 304321316347310s, 904L and so on, as long as the material of stainless steel in accordance with GB9684 standards of production and processing, can be used as a food grade stainless steel, it should be said that in accordance with the implementation of the standard GB9684 production and processing of food grade stainless steel is 304.
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:Are stainless steel pipelines buried in need of corrosion protection?
In the aqueous medium such as Cl-, the localized destruction of the passive film due to acidification of the dielectric solution in the crevice (increasing of Cl- concentration, decrease in pH value) and hypoxia (oxygen concentration cell, gap hypoxia). The most fundamental is to eliminate the gap from the structure is designed to avoid the gap of the heat exchanger tube is connected with the gap at the gap on the tube plate, flange, gaskets, bolts, rivets, to take appropriate measures to prevent.
Q:Mirror stainless steel tube 60*60 how much is one meter?
Examples are stainless steel 63 round tubes, solid thickness 0.82 stainless steel tubes, single support 6 meters long, weight (63-0.82) *0.82*0.02491*6=7.62kg, a six meter long 63 round tube, thickness 0.82, theoretical weight is 7.62kg;

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