ASTM A216 Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service
ASTM A216 covers carbon steel castings for valves, flanges, fittings, or other pressure-containing parts for high temperature service and of quality suitable for assembly with other castings or wrought-steel parts by fusion welding.
Three grades, WCA, WCB, and WCC, are covered in this specification. Selection will depend upon design and service conditions, mechanical properties, and the high temperature characteristics.
Chemical Requirements Composition, %, max
| Element | UNS J02502 | UNS J03002 | UNS J02503 |
| Grade WCA | Grade WCB | Grade WCC | |
| Carbon | 0.25A | 0.30B | 0.25C |
| Manganese | 0.7A | 1.00B | 1.20C |
| Phosphorus | 0.035 | 0.035 | 0.035 |
| Sulfur | 0.035 | 0.035 | 0.035 |
| Silicon | 0.60 | 0.60 | 0.60 |
| Specified residual elements: | |||
| Copper | 0.30 | 0.30 | 0.30 |
| Nickel | 0.50 | 0.50 | 0.50 |
| Chromium | 0.50 | 0.50 | 0.50 |
| Molybdenum | 0.20 | 0.20 | 0.20 |
| Vanadium | 0.02 | 0.02 | 0.02 |
| Total of these specified residual elements | 1.00 | 1.00 | 1.00 |
A For each reduction of 0.01 % below the specified maximum carbon content, an increase of 0.04 % manganese above the specified maximum will be permitted up to a maximum of 1.10 %.
B For each reduction of 0.01 % below the specified maximum carbon content, an increase of 0.04 % Mn above the specified maximum will be permitted up to amaximum of 1.28 %.
C For each reduction of 0.01 % below the specified maximum carbon content, an increase of 0.04 % manganese above the specified maximum will be permitted toa maximum of 1.40 %.
Tensile Requirements
| Grade WCA | Grade WCB | Grade WCC | |
| Tensile Strength, min ksi [MPa] | 60 to 85 [415-585] | 70 to 95 [485-655] | 70 to 95 [485-655] |
| Yield Strength,A min ksi [MPa] | 30 [205] | 36 [250] | 40 [275] |
| Elongation in 2 in. or 50 mm , min, % B | 24 | 22 | 22 |
| Reduction of area,min, % | 35 | 35 | 35 |
A Determine by either 0.2 % offset method or 0.5 % extension-under-load method.
B When ICI test bars are used in tensile testing as provided for in Specification A703/A703M, the gage length to reduced section diameter ratio shall be 4 to 1.
