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Introduction
UNS S31803(SS2205 stainless steel), also known as S31803 or 2205/F51, is a duplex stainless steel with high hardness and good corrosion resistance.Due to its good corrosion resistance, SS2205 stainless steel is particularly popular in the production of sour oil and gas wells. In addition,S31803 also has high strength and good impact toughness, as well as good overall and local stress corrosion resistance, which allows it to maintain good performance at high temperatures. It should be noted that the performance of S31803 may be reduced when used under welding conditions. In order to improve this situation, nitrogen is added to F51 stainless steel, which not only improves its corrosion resistance, but also makes welding better.
Chemical components(%)
Composition | C | Si | Mn | P | S | Cr | Ni | Mo | N |
Min | \ | \ | \ | \ | \ | 21.00 | 4.50 | 2.50 | 0.08 |
Max | 0.03 | 1.00 | 2.00 | 0.03 | 0.02 | 23.00 | 6.50 | 3.50 | 0.20 |
Mechanical properties
Rigidity | Tensile strength | Yield strength | Elongation |
200-290HB | ≥620MPa | ≥450MPa | ≥25% |
Physical properties
Density | Melting points | Specific heat | Magnetism | Thermal conductivity | Linear expansivity |
7.80g/cm3 | 1420-1465℃ | 0.5J/(kg.℃） | yes | 19.0W/(m.k)(100℃) | 13.7×10-6℃/(0-100℃) |
UNS S31803 Production Standard
Round bars/Wires | ASTM A276 |
Sheet/Plate | ASTM A240(for pressure vessels and general applications) |
Seamless and Welded Tubes/Pipes | ASTM A789(for general service) ASTM A790(for general corrosive service) |
Flanges/Fittings/Valves/Parts | ASTM A182 |
Applications
l Pressure vessels, high-pressure storage tanks, high-pressure pipelines, heat exchanger (chemical processing industry)
l Oil and gas pipelines, heat exchanger fittings
l Wastewater treatment system
l Classifiers, bleaching equipment, storage and handling systems for the pulp and paper industry. (5)Rotary shafts, press rollers, blades, impellers, etc. in high-strength and corrosion-resistant environments
l Ship or truck cargo box
l Food processing equipment
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