ASTM A216 covers three grades of carbon steel (Grades WCA, WCB, and WCC). Today, we will introduce the mechanical properties, chemical composition and other properties of this grade for you.

Which grade should be selected depends on the design and use conditions, mechanical properties and high temperature characteristics.

This standard applies to carbon steel castings for valves, flanges, fittings or other pressure-bearing parts that work at high temperatures. At the same time, its quality is suitable for assembly with other castings or forged steel parts through fusion welding.

After the steel casting is cooled to below the transformation range, it should be heat treated and arranged under the conditions of annealing, normalizing, normalizing and tempering according to its design and chemical composition.

The surface of the steel casting should be free of attachments such as sand, cracks, hot tears and other discontinuities. Therefore, repair welding should be carried out when deemed appropriate.

ASTM A216 Grade WCA Cast Steel

Material Properties

Density: 7.82 g/cm3 (488 lb/ft3)
Elastic (Young’s, Tensile) Modulus: 210 GPa (30 x 106 psi)
Elongation at Break: 28 %
Specific Heat Capacity: 450 J/kg-K
Strength to Weight Ratio: 64 kN-m/kg
Tensile Strength: Ultimate (UTS): 500 MPa (73 x 103 psi)
Tensile Strength: Yield (Proof): 220 MPa (32 x 103 psi)
Thermal Expansion: 11.8 µm/m-K

Alloy Composition

Iron (Fe): 97.4 to 100 %
Residuals: 0 to 1.0 %
Manganese (Mn): 0 to 0.7 %
Silicon (Si): 0 to 0.6 %
Carbon (C): 0 to 0.25 %
Sulfur (S): 0 to 0.045 %
Phosphorus (P): 0 to 0.04 %

ASTM A216 Grade WCB Cast Steel

Material Properties

Density: 7.82 g/cm3 (488 lb/ft3)
Elastic (Young’s, Tensile) Modulus: 210 GPa (30 x 106 psi)
Elongation at Break: 25 %
Specific Heat Capacity: 450 J/kg-K
Strength to Weight Ratio: 73 kN-m/kg
Tensile Strength: Ultimate (UTS): 570 MPa (83 x 103 psi)
Tensile Strength: Yield (Proof): 280 MPa (41 x 103 psi)
Thermal Expansion: 11.9 µm/m-K

Alloy Composition

Iron (Fe): 97.0 to 100 %
Manganese (Mn): 0 to 1.0 %
Residuals: 0 to 1.0 %
Silicon (Si): 0 to 0.6 %
Carbon (C): 0 to 0.3 %
Sulfur (S): 0 to 0.045 %
Phosphorus (P): 0 to 0.04 %

ASTM A216 Grade WCC Cast Steel

Material Properties

Density: 7.82 g/cm3 (488 lb/ft3)
Elastic (Young’s, Tensile) Modulus: 210 GPa (30 x 106 psi)
Elongation at Break: 25 %
Specific Heat Capacity: 450 J/kg-K
Strength to Weight Ratio: 73 kN-m/kg
Tensile Strength: Ultimate (UTS): 570 MPa (83 x 103 psi)
Tensile Strength: Yield (Proof): 300 MPa (44 x 103 psi)
Thermal Expansion: 11.9 µm/m-K

Alloy Composition

Iron (Fe): 96.9 to 100 %
Manganese (Mn): 0 to 1.2 %
Residuals: 0 to 1.0 %
Silicon (Si): 0 to 0.6 %
Carbon (C): 0 to 0.25 %
Sulfur (S): 0 to 0.045 %
Phosphorus (P): 0 to 0.04 %

Reference Standards:

A488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
A703/A703M Specification for Steel Castings, General Requirements, for Pressure-Containing Parts
A985/A985M Specification for Steel Investment Castings General Requirements, for Pressure-Containing Parts

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