ASTM A204 Grade C is a molybdenum‑alloy pressure vessel steel plate designed for medium‑temperature service where higher strength and improved thermal stability are required. As the strongest grade within the A204 family, Grade C provides enhanced tensile performance and reliable creep resistance, making it suitable for boilers, heat‑exchanger shells, and petrochemical equipment operating under sustained elevated temperatures. The material offers dependable weldability, uniform mechanical behavior, and consistent performance in pressure‑bearing structures requiring long‑term durability.
Chemical Composition

C	Mn	P	S	Si	Mo
≤0.28	0.40–0.90	≤0.025	≤ 0.025	0.15–0.40	0.45–0.60

 
Mechanical Properties

Property	Yield Strength	Tensile Strength	Elongation
Requirement	≥ 275 MPa	485-620MPa	≥ 20%

 
Dimensions

Thickness	3–150 mm
Width	1220–4200 mm
Length	5000–18000 mm
Supports custom cutting and shaping.

 

Stock & Processing

• Regular stock for A204 Grade C

• Cutting, drilling, welding, bending, machining

• Custom dimensions available

• Fast delivery for project orders

• Global supply capability

Applications

• Medium‑temperature pressure vessels

• Boilers and heat‑exchanger shells

• Petrochemical reactors

• Industrial heating equipment

• Components requiring higher tensile strength at elevated temperatures