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304 is available in Sheet, Strip, Plate, Tube, Bar (Round), Rod, Rings, Forgings.
Type 304 is a variation of the basic 18-8 grade, Type 304, with a higher chromium and lower carbon content. Lower carbon minimizes chromium carbide precipitation due to welding and its susceptibility to intergranular corrosion. In many instances, it can be used in the ”as-welded“ condition, while Type 304 must be annealed in order to retain adequate corrosion resistance.
Type 304L is an extra low-carbon variation of Type 304 with a 0.03% maximum carbon content that eliminates carbide precipitation due to welding. As a result, this alloy can be used in the ”as-welded“ condition, even in severe corrosive conditions. It often eliminates the necessity of annealing weldments except for applications specifying stress relief. It has slightly lower mechanical properties than Type 304.
Specifications : Types 304 Stainless Steel and 304L Stainless Steel are covered by the following specifications:
| Grade | US Aerospace/Military | US Commercial | British Specification | European Specification | Other |
| 304304L304LVM (Vac Melt)304 Tube | AMS 5501 Sheet / strip 125ksi AMS 5511 Sheet /strip (ann) AMS 5513 Sheet / strip (ann) AMS 5560 Seamless tube AMS 5563 1/4Hd seamless/welded AMS 5564 1/8Hd seamless/welded AMS 5565 Welded tube AMS 5566 Seamless/welded tube AMS 5567 Seamless/welded tube AMS 5569 Seamless/ welded tube AMS 5575 Welded tube AMS 5639 Bar / Forgings (304) AMS 5647 Bar/Forgings (304L) MIL-T-8506 Seamless /welded tube MIL-T-5695 Seamless / welded tube MIL-T-6845 Seamless / welded MIL-T-8504 Seamless/welded tube MIL-T-6737 Welded tube QQ-S-763 | ASTM A276 / ASME SA276 ASTM A479 / ASME SA479 ASTM A484 / ASME SA484 | BS 970; 304S31 / 304S12 | Werkstoff 1.4306 AFNOR Z2CN18-10 | UNS S30400 UNS S30403 |
| Chemical Composition Limits | |||||||||
| Weight % | C | Si | Mn | P + S | Cr | Ni | Fe | Mo | Cu |
| AMS 5511 304L | 0.03 max | 1.00 max | 2.0 max | 0.040 P 0.03 S | 18.0 - 20.0 | 8.0 - 11.00 | Bal | 0.75 max | 0.75 max |
| AMS 5513 304 | 0.08 max | 1.00 max | 2.0 max | 0.040 P 0.03 S | 18.0 - 20.0 | 8.0 - 10.5 | Bal | 0.75 max | 0.75 max |
| Specification | Tensile Strength (ksi) | Yield Strength (ksi) | Elongation (%) | Reduction of Area | Hardness HB |
| Sheet (Annealed) AMS 5511 | 100 max | - | 40 | - | - |
| Sheet (Annealed) AMS 5513 | 75 min | 30 | 40 | - | 202 |
| Bar (Sol Treated) 304 - AMS 5639 | 75 | 30 | 40 | 50 | |
| Bar (Sol Treated) 304L - AMS 5647 | - | - | - | - | 140-241 |
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