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ASTM A240 Specification for Stainless Steel Plates, Sheets and Strips used as parent material for manufacturing Flat Washers.
ASTM A240 specification covers stainless steel plates, sheets and strips for pressure vessels and general applications. This specification covers chemical composition and mechanical properties for various grades of ferritic, austenitic, martensitic, duplex, super duplex and high moly stainless steel alloys. Boltport frequently uses sheets and plates of 304, 304l, 316, 316l, 321, 347, 309, 310, 316Ti, 317L, Xm-19, 904L, 409, 410, 430, Duplex S31803, S32205, Super Duplex S32750, S32760, S32550, High moly UNS S31254, Alloy 20, etc., conforming to ASTM A240 specification for manufacturing sheet metal washers for bolting assemblies.
| Element | 304 | 316 | 321 | 410 | 904L | S31803 | S32750 | S31254 |
|---|---|---|---|---|---|---|---|---|
| Carbon | 0.07 | 0.08 | 0.08 | 0.08 – 0.15 | 0.02 | 0.03 | 0.03 | 0.02 |
| Manganese, max | 2.00 | 2.00 | 2.00 | 1.00 | 2.00 | 2.00 | 1.20 | 1.00 |
| Phosphorus, max | 0.045 | 0.045 | 0.045 | 0.040 | 0.045 | 0.030 | 0.035 | 0.030 |
| Sulfur, max | 0.030 | 0.030 | 0.030 | 0.030 | 0.035 | 0.020 | 0.020 | 0.010 |
| Silicon | 0.75 | 0.75 | 0.75 | 1.00 | 1.00 | 1.00 | 0.80 | 0.80 |
| Chromium | 17.50 – 19.50 | 16.00 – 18.00 | 17.00 – 19.00 | 11.50 – 13.50 | 19.00 – 23.00 | 21.00 – 23.00 | 24.00 – 26.00 | 19.50 – 20.50 |
| Nickel | 8.00 – 10.50 | 10.00 – 14.00 | 9.00 – 12.00 | 0.75 | 23.00 – 28.00 | 4.50 – 6.50 | 6.00 – 8.00 | 17.50 – 18.50 |
| Molybdenum | … | 2.00 – 3.00 | … | … | 4.00 – 5.00 | 2.50 – 3.50 | 3.00 – 5.00 | 6.00 – 6.50 |
| Nitrogen | 0.10 max | 0.10 max | 0.10 max | … | 0.10 max | 0.08 – 0.20 | 0.24 – 0.32 | 0.18 – 0.25 |
| Copper, max | … | … | … | … | 1.00 – 2.00 | … | 0.50 | 0.50 – 1.00 |
| Titanium | … | … | 5 x (C+N) – 0.70 | … | … | … | … | … |
| Type | Tensile Strength, ksi, min | Yield Strength, ksi, min | Elongation, % min | Hardness, maxA |
|---|---|---|---|---|
| 304 | 75 | 30 | 40 | 201 HBW or 92 HRB |
| 316 | 75 | 30 | 40 | 217 HBW or 95 HRB |
| 321 | 75 | 30 | 40 | 217 HBW or 95 HRB |
| 410 | 65 | 30 | 20 | 217 HBW or 96 HRB |
| 904L | 71 | 31 | 35 | 95 HRB |
| UNS S31803 | 90 | 65 | 25 | 293 HBW or 31 HRC |
| UNS S32750 | 116 | 80 | 15 | 310 HBW or 32 HRC |
| UNS S31254 | 100 | 45 | 35 | 223 HBW or 96 HRB |
| Type | Raw Material |
|---|---|
| 304 | 18-8 Chromium Nickel Austenitic Stainless Steel |
| 316L | Low Carbon, Chromium Nickel Molybdenum Austenitic Stainless Steel |
| 321 | Titanium Stabalized 18-8 Chromium Nickel Austenitic Stainless Steel |
| 410 | 12% Straight Chromium Martensitic Stainless Steel |
| 904L | High Nickel Molybdenum Super Austenitic Stainless Steel |
| UNS S31803 | Ferritic / Austenitic Duplex Stainless Steel |
| UNS S32750 | Ferritic / Austenitic Super Duplex Stainless Steel |
| UNS S31254 | High Moly Austenitic Stainless Steel |