About Alloy
321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture properties than alloys 304 and 304L. It also possesses good low temperature toughness.
321H (UNS S 32109) is the higher carbon (0.04 – 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the plate enables dual certification.
321 cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.
321 stainless steel plate is also advantageous for high temperature service because of its good mechanical properties. 321 stainless steel plate offers higher creep and stress rupture properties than 304 and, particularly, 304L, which might also be considered for exposures where sensitization and intergranular corrosion are concerns.
Product Form & Standard
AMS 5510: Sheet / strip / plate
AMS 5557: Welded/seamless tube
AMS 5559: Welded / thin wall tube
AMS 5570: Seamless tube
AMS 5576: Welded tube
AMS 5645: Bars / wire / forging
Chemical Composition
| Weight% | C | Si | Mn | P+S | Cr | Ni | Ti | N | Fe | Cu | Mo |
| AMS 5510 Alloy 321 | 0.08 max | 0.25-1.00 | 2.0 max | 0.040P 0.030S | 17-19 | 9-12 | 0.7 max | 0.1 max | Bal | 0.75 max | 0.75 ma |
Mechanical Properties
| Material | Condition | Tensile Strength (ksi) | Yield Strength (ksi) | % Elongation | Hardness HB |
| Alloy 321 AMS 5510 | AMS 5510 Sheet (Sol Trtd) | 70-100 | 25 | 40 | - |
| Alloy 321 AMS 5645 | AMS 5645 Bar (Sol Trtd) | - | - | - | 255 max |
Application
Aerospace – piston engine manifolds
Chemical Processing
Expansion Joints
Food Processing – equipment and storage
Petroleum Refining – polythionic acid service
Waste Treatment – thermal oxidizers
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