ASME SA662/SA662M

ASME SA662/SA662M is a standard for carbon-manganese-silicon alloy steel plates used in medium and low temperature pressure vessels developed by the American Society of Mechanical Engineers (ASME). It is suitable for welding and manufacturing pressure vessels subjected to medium and low pressure loads, especially in low temperature environments.

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Product Description

1.What are the chemical compositions and mechanical properties of ASME SA662/SA662M?

Chemical Compositions (Weight %)

Element	Grade A	Grade B	Grade C
Carbon (C)	≤0.25%	≤0.25%	≤0.23%
Manganese (Mn)	0.70–1.35%	0.90–1.50%	0.90–1.50%
Phosphorus (P)	≤0.035%	≤0.035%	≤0.035%
Sulfur (S)	≤0.035%	≤0.035%	≤0.035%
Silicon (Si)	0.15–0.40%	0.15–0.40%	0.15–0.40%

Mechanical Properties

Property	Grade A	Grade B	Grade C
Tensile Strength (MPa)	415–550	485–620	515–655
Yield Strength (MPa, min)	240	275	290
Elongation in 200mm (%)	≥21	≥21	≥21
Charpy V-Notch Impact Energy (J)	Not specified	≥27 (at -29°C)	≥27 (at -46°C)

2.What are the characteristics of ASME SA662/SA662M?

Balanced Performance: Combines moderate strength with good weldability and formability.
Cost-Effective: Cheaper than high-alloy steels (e.g., stainless steel) for non-corrosive, moderate-strength applications.
Wide Availability: Commonly used in pressure vessel fabrication due to its code compliance (e.g., ASME BPVC Section II).
HeatTreatment: Plates are usually supplied in the as-rolled or normalized condition to optimize mechanical properties.

3.What are the application scenarios of ASME SA662/SA662M?

Pressure Vessels in Moderate/Low-Temperature Environments:Used for manufacturing pressure vessels operating at ambient to sub-zero temperatures.
Hydrocarbon Processing and Petrochemical Industry:Suitable for vessels and equipment in oil refineries, petrochemical plants, and gas processing facilities:Distillation columns,Pressure drums and separators,Pipelines and fittings handling cold fluids .
Power Generation Systems:Used in non-critical components of power plants, such as:Low-temperature feedwater systems,Auxiliary pressure vessels in steam cycles.
Industrial Equipment:General industrial applications requiring moderate strength and good low-temperature toughness:Air separation units,Chemical processing equipment,Marine or offshore structures (e.g., cold-region storage tanks).