The following specifications cover Stainless Steel 321
- AISI 321
- AMS 5510
- AMS 5557
- AMS 5559
- AMS 5570
- AMS 5576
- AMS 5645
- AMS 5689
- ASTM A167
- ASTM A182
- ASTM A193 (321,B8T, B8TA)
- ASTM A194 (321,B8T, B8TA)
- ASTM A213
- ASTM A240
- ASTM A249
- ASTM A269
- ASTM A271
- ASTM A276
- ASTM A312
- ASTM A314
- ASTM A320 (321,B8T, B8TA)
- ASTM A336
- ASTM A358
- ASTM A376
- ASTM A403
- ASTM A409
- ASTM A430
- ASTM A473
- ASTM A479
- ASTM A511
- ASTM A554
- ASTM A580
- ASTM A632
- ASTM A774
- ASTM A778
- ASTM A813
- ASTM A814
- DIN 1.4541
- MIL S-27419
- MIL T-6737
- QQ S763
- QQ S766
- UNS S32100
- 8R30(tm)
- Project 70 321(tm)
- Remanit 4541(tm)
| Carbon | 0.08 max | |
| Chromium | 17 – 19 | |
| Iron | Balance | |
| Manganese | 2 max | |
| Nickel | 9 – 12 | |
| Phosphorus | 0.045 max | |
| Silicon | 1 max | |
| Sulphur | 0.03 max | |
| Titanium | Min:5 x C |
| Principal Design Features | |
The key feature of 321 stainless is its resistance to intergranular corrosion. It employs titanium as a stabilizing element against chromium carbide formation. This alloy also exhibits strength characteristics superior to those of 304 stainless. |
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| Applications | |
Jet engine parts, furnace heat treated parts, expansion joints, turbo superchargers, oil refiners, exhaust manifolds and high temperature chemical production equipment. |
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| Machinability | |
Slightly tougher than 304 stainless, this material will produce the same tough stringy chips. The use of slow speeds and constant positive feeds will minimize this alloy’s tendency to work harden. |
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| Welding | |
321 may be welded by all commonly used fusion and resistance methods. Oxyacetylene welding is not recommended. When necessary, use AWS E/ER347 filler metal. |
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| Hot Working | |
Working temperatures of 2100-2300 F (1149-1260 C) are recommended for forging, upsetting and other hot work processes. Do not work this alloy at temperatures below 1700 F ( 927 C). Material must be water quenched or fully annealed after working to reattain maximum corrosion resistance. |
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| Cold Working | |
Although this material requires higher initial forces than 304 stainless, it is quite tough and ductile and can be readily stamped, blanked, spun and drawn. |
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| Annealing | |
1800-2000 F (928-1093 C), air cool. This procedure will result in maximum ductility. For maximum corrosion resistance, see the note on stabilizing anneal under corrosion. |
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| Hardening | |
This alloy does not harden by heat treating. Elevated properties may only be obtained through cold reduction. |
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| Density (lb / cu. in.) | 0.29 |
| Specific Gravity | 7.9 |
| Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) | 0.12 |
| Electrical Resistivity (microhm-cm (at 68 Deg F)) | 432 |
| Melting Point (Deg F) | 2600 |
| Modulus of Elasticity Tension | 28 |
Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.