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.
(For Metric Units, please visit ASTM A240M Specification)
| Grade | Raw Material |
|---|---|
| 304 | 18-8 Chromium Nickel Austenitic Stainless Steel |
| 304L | Low Carbon, 18-8 Chromium Nickel Austenitic Stainless Steel |
| 316 | Chromium Nickel Molybdenum 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 |
| S31803 | Ferritic / Austenitic Duplex Stainless Steel |
| S32205 | Ferritic / Austenitic Duplex Stainless Steel |
| S32750 | Ferritic / Austenitic Super Duplex Stainless Steel |
| S32760 | Ferritic / Austenitic Super Duplex Stainless Steel |
| S31254 | High Moly Austenitic Stainless Steel |
| N08020 | Nickel Iron Chromium Austenitic Stainless Steel |
(For all grades, please visit ASTM A240 Grades)
| Element | Grade B5 | Grade B6 | Grade B7, 7M | Grade B16 | Grade B8 | Grade B8M | Grade B8T |
|---|---|---|---|---|---|---|---|
| Carbon | 0.10 min | 0.08-0.15 | 0.37-0.49 | 0.36-0.47 | 0.08 | 0.08 | 0.10 min |
| Manganese, max | 1.00 | 1.00 | 0.65-1.10 | 0.45-0.70 | 2.00 | 2.00 | 1.00 |
| Phosphorus, max | 0.040 | 0.040 | 0.035 | 0.035 | 0.045 | 0.045 | 0.040 |
| Sulfur, max | 0.003 | 0.030 | 0.040 | 0.040 | 0.030 | 0.030 | 0.030 |
| Silicon | 1.00 | 1.00 max | 0.15-0.35 | 0.15-0.35 | 1.00 | 1.00 | 1.00 max |
| Chromium | 4.0-6.0 | 11.5-13.5 | 0.75-1.20 | 0.80-1.15 | 18.0-20.0 | 16.0-18.0 | 4.00-6.00 |
| Molybdenum | 0.40-0.65 | -- | 0.15-0.25 | 0.50-0.65 | -- | 2.00-3.00 | 0.40-0.65 |
| Vanadium | -- | -- | -- | 0.25-0.35 | -- | -- | -- |
| Aluminium, max | -- | -- | -- | 0.015 | -- | -- | -- |
| Bolt Grade | Diameter, in. | Tensile Strength, ksi | Yield Strength ksi | Elongation, % | Reduction, % | Hardness |
|---|---|---|---|---|---|---|
| B5 | Up to 4, inclusive | 100 | 80 | 16 | 50 | -- |
| B6 | Up to 4, inclusive | 110 | 85 | 15 | 50 | -- |
| B7 | 2.5 and under | 125 | 105 | 16 | 50 | 321 HBW or 35 HRC |
| Over 2.5 to 4 | 115 | 95 | 16 | 50 | 321 HBW or 35 HRC | |
| Over 4 to 7 | 100 | 75 | 18 | 50 | 321 HBW or 35 HRC | |
| B7M | 4 and under | 100 | 80 | 18 | 50 | 235 HBW or 99 HRB |
| over 4 to 7 | 100 | 75 | 18 | 50 | 235 HBW or 99 HRB | |
| B16 | 2.5 and under | 125 | 105 | 18 | 50 | 321 HBW or 35 HRC |
| Over 2.5 to 4 | 110 | 95 | 17 | 45 | 321 HBW or 35 HRC | |
| Over 4 to 8 | 100 | 85 | 16 | 45 | 321 HBW or 35 HRC | |
| B8, B8M, Class 1 | All Diameters | 75 | 30 | 30 | 50 | 223 HBW or 96 HRB |
| B8, B8T, Class 2 | 3/4 and under | 125 | 100 | 12 | 35 | 321 HBW or 35 HRC |
| Over 3/4 to 1, inclusive | 115 | 80 | 20 | 45 | 321 HBW or 35 HRC | |
| Over 1 to 1 1/4, inclusive | 105 | 65 | 25 | 45 | 321 HBW or 35 HRC | |
| Over 1 1/4 to 1 1/2, inclusive | 100 | 50 | 30 | 45 | 321 HBW or 35 HRC | |
| B8M, Class 2 | 3/4 and under | 110 | 95 | 15 | 45 | 321 HBW or 35 HRC |
| over 3/4 to 1, inclusive | 100 | 80 | 20 | 45 | 321 HBW or 35 HRC | |
| over 1 to 1 1/4, inclusive | 95 | 65 | 25 | 45 | 321 HBW or 35 HRC | |
| M30 to M36, inclusive | 620 | 345 | 30 | 45 | 321 HBW or 35 HRC |