ASTM A204/A204M

This specification covers molybdenum alloy steel plates, intended particularly for welded boilers and other pressure vessels. Plates under this specification are available in three grades having different strength levels: Grade A; Grade B; and Grade C. The steel shall be killed. The steel shall conform to the chemical requirements specified. Tension tests on plates shall conform to the requirements specified.

Chat Now

Send Inquiry

Product Description

1.What is ASTM A204/A204M Alloy Steel Plate?

It is a multipurpose alloy steel alloy that is highly usable and multipurpose. It is also known as Molybdenum based alloy. Alloy Steel 204 GR A Plates have a high Molybdenum content and are highly used in welded boilers and pressure vessels.

2.What are the chemical compositions and mechanical properties of ASTM A204/A204M?

chemical compositions

Grade	Carbon (C)	Manganese (Mn)	Silicon (Si)	Molybdenum (Mo)	Phosphorus (P) ≤	Sulfur (S) ≤	Typical Application Temperature
Grade A	≤0.25%	0.40–0.65%	0.15–0.30%	0.45–0.60%	0.035%	0.035%	≤480°C
Grade B	≤0.20%	0.40–0.70%	0.15–0.30%	0.80–1.00%	0.035%	0.035%	≤540°C
Grade C	≤0.20%	0.40–0.70%	0.15–0.30%	1.00–1.20%	0.035%	0.035%	≤595°C

mechanical properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa) ≥	Elongation (%) ≥	Impact Toughness (Optional)
Grade A	415–550	205	22	Requires additional testing
Grade B	485–625	275	20	Requires additional testing
Grade C	550–690	310	18	Requires additional testing

3.What are the main uses of ASTM A204/A204M?

Energy Industry

Power Plant Boilers: High-temperature steam pipelines, superheaters, reheaters, etc. (e.g., Grade B/C used in supercritical boilers).
Industrial Furnace Equipment: Pressure-bearing components of heat treatment furnaces, high-temperature flue gas heat exchangers.

Chemical and Petrochemical Industry

Medium and High-Temperature Pressure Vessels: Vacuum towers in refineries, ammonia synthesis reactors (resistant to hydrogen corrosion).
Heat Exchanger Shells: Scenarios requiring long-term exposure to high-temperature media (e.g., heat transfer oil systems).

Mechanical Manufacturing

Heavy Equipment Structural Components: Mechanical parts requiring high-temperature strength (e.g., support structures for metallurgical industry heating furnaces).

Products Categories