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Materials of Construction of Stainless Steel Valves
　
| Composition, % |
| ASTM A351 | ASTM A494 | ||||
| Element | CF8M | CF3M | CN7M | M-35-1 | CW-12MW |
| Carbon | 0.08 | 0.03 | 0.07 | 0.35 | 0.12 |
| Chromium | 18.0 - 21.0 | 17.0 - 21.0 | 19.0 - 22.0 | 0.00 | 15.5 - 17.5 |
| Columbium (Niobium) | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 |
| Copper | 0.00 | 0.00 | 3.0 - 4.0 | 26.0 - 33.0 | 0.00 |
| Iron | 0.00 | 0.00 | 0.00 | 3.50 | 4.5 - 7.5 |
| Manganese | 1.50 | 1.50 | 1.50 | 1.50 | 1.00 |
| Molybdenum | 2.0 - 3.0 | 2.0 - 3.0 | 2.0 - 3.0 | 0.00 | 16.0 - 18.0 |
| Nickel | 9.0 - 12.0 | 9.0 - 13.0 | 27.5 - 30.5 | balance | balance |
| Phosphorus | 0.04 | 0.04 | 0.04 | 0.03 | 0.04 |
| Silicon | 1.50 | 1.50 | 1.50 | 1.25 | 1.00 |
| Sulfur | 0.04 | 0.04 | 0.04 | 0.03 | 0.03 |
| Tungsten | 0.00 | 0.00 | 0.00 | 0.00 | 3.75 - 5.25 |
| Vanadium | 0.00 | 0.00 | 0.00 | 0.00 | 0.20 - 0.40 |
| Assume all values are maximum, unless a range is given |
| Tensile Requirements | Mechanical Properties | ||||
| Tensile Strength | 70,000 | 70,000 | 62,000 | 65,000 | 72,000 |
| Yield Strength | 30,000 | 30,000 | 25,000 | 25,000 | 40,000 |
| Elongation in 2 inches, % | 30.0% | 30.0% | 35.0% | 25.0% | 4.0% |
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