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Introduction
SUS321 stainless steel is a stainless steel containing titanium stabilizing elements. Its chemical composition mainly includes chromium (Cr), nickel (Ni), titanium (Ti) and other elements. The reasonable ratio of these elements makes USU321 stainless steel round steel have excellent corrosion resistance and high temperature strength. At the same time, Type 321 is a stabilized austenitic stainless steel similar to type 304 but with a titanium addition. Meanwhile, This alloy cannot be hardened by heat treatment
Chemical components(%)
Composition | C | Si | Mn | P | S | Cr | Ni | Mo | Al |
Min | \ | \ | \ | \ | \ | 17.00 | 9.00 | 2.00 | 0.75 |
Max | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 19.00 | 12.00 | 3.00 | 1.5 |
Mechanical properties
Rigidity | Tensile strength | Yield strength | Elongation |
≤187HB | ≥515MPa | ≥205MPa | ≥40% |
Physical properties
Density | Melting points | Specific heat | Magnetism | Resistivity | Thermal conductivity | Linear expansivity |
7.93g/cm3 | 1398℃ | 0.50J/(Kg.℃） | \ | 0.072×10-6Ω·m(20℃) | 16.2W/(m.k)(100℃) | 16.5×10-6/K(20-100℃) |
SUS321 Stainless steel Available products and Standard
Round bars/Wires | ASTM A276,ASTM A314 |
Sheet/Plate/Strip | ASTM A240 |
Seamless and Welded Tubes/Pipes | ASTM A312(for high-temperature and general corrosive service) ASTM A269 (Seamless and Welded Austenitic Stainless Steel Tubing) ASTM A213 (Seamless Steel Boiler,Superheater,and Heat-Exchanger Tubes) |
Flanges/Fittings/Valves/Parts | ASTM A182 |
SUS321 Stainless steel performance
(1)Corrosion resistance:SUS321 stainless steel performs well in a variety of corrosive environments, especially in oxidizing media.
(2)High temperature resistance:Due to the titanium element,SUS321 stainless steel can still maintain good mechanical properties at high temperatures and is suitable for working environments up to 800°C.
(3)Resistance to intergranular corrosion:The addition of titanium effectively inhibits the occurrence of intergranular corrosion, allowing SUS321 stainless steel to maintain good corrosion resistance after welding or other high-temperature processing.
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