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Introduction
UNS S31703(317L) is an austenitic stainless steel,it has stronger resistance to chemical corrosion, especially in environments containing chloride ions. Its corrosion resistance increases with the increase in the molybdenum content of the alloy. And compared with conventional chromium-nickel austenitic stainless steel,317L alloy has higher ductility, stress corrosion resistance, compressive strength and high temperature resistance.317L is a low carbon grade or L grade that has excellent resistance to sensitization during welding and heat treatment.
Chemical components(%)
Composition | C | Si | Mn | P | S | Cr | Ni | Mo | Al |
Min | \ | \ | \ | \ | \ | 14.0 | 6.5 | 2.00 | 0.75 |
Max | 0.09 | 1.00 | 1.00 | 0.04 | 0.03 | 16.0 | 7.75 | 3.00 | 1.5 |
Mechanical properties
Rigidity | Tensile strength | Yield strength | Elongation |
≤217HB | ≥515MPa | ≥205MPa | ≥35% |
Physical properties
Density | Melting points | Specific heat | Magnetism | Thermal conductivity | Linear expansivity |
8.0g/cm3 | 141500-1425℃ | 502J/(kg.℃） | yes | 14.6W/(m.k)(100℃) | 16.5×10-6/K(20-100℃) |
UNS S31703 Production Standard
Round bars/Wires | ASTM A276 |
Sheet/Plate | ASTM A240(for pressure vessels and general applications) |
Seamless and Welded Tubes/Pipes | ASTM A312(for high-temperature and general corrosive service) ASTM A269(for general service) |
Flanges/Fittings/Valves/Parts | ASTM A182 |
Seamless heat-exchanger Tubes | ASTM A213 |
Applications
(1)317L stainless steel is widely used in petroleum and petrochemical equipment, such as reactors in petrochemical equipment.
(2)In the flue gas desulfurization device of the power plant,317L stainless steel is used in the tower body, flue, baffle plate, internal parts, spray system, etc. of the absorption tower.
(3)Seawater treatment equipment, seawater heat exchangers, paper industry equipment, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment and other fields are also the application places of 317L stainless steel.
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