ASME SA387SA387M

The ASME SA387 standard covers the supply of weldable chrome molybdenum alloy steel plates for pressure vessels used in elevated temperature service. The added molybdenum and chromium provides excellent corrosion resistance and high temperature resistance respectively.

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Product Description

1.What are the chemical compositions and mechanical properties of ASME SA387/SA387M?

Chemical Composition

Grade	Carbon (C)	Silicon (Si)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)	Chromium (Cr)	Molybdenum (Mo)
Grade11	0.05% – 0.17%	0.50% – 0.80%	0.40% – 0.65%	≤0.025%	≤0.025%	1.00% – 1.50%	0.45% – 0.65%
Grade22	0.10% – 0.18%	≤0.10%	≤0.65%	≤0.025%	≤0.025%	2.00% – 2.50%	0.90% – 1.10%

Mechanical Properties

Grade	Tensile Strength	Yield Strength	Elongation	Reduction of Area	Impact Energy (Charpy V-Notch)
Grade11	515 – 690 MPa	≥310 MPa	≥18%	≥40%	≥27 J at -30°C
Grade22	515 – 690 MPa	310 – 620 MPa	≥18%	≥45%	Not Specified

2.What are the characteristics of ASME SA387/SA387M?

High-Temperature Strength: Retains mechanical integrity at elevated temperatures (up to ~650°C, depending on grade), making it suitable for components like boiler plates, pressure vessels, and heat exchangers.
Toughness:Good impact resistance, especially in normalized and tempered conditions (e.g., Grade 11 may require impact testing at -30°C).
Weldability:Generally weldable, but preheating and post-weld heat treatment (PWHT) are often required to prevent hydrogen-induced cracking and improve ductility.
Heat Treatment:

Normalized and Tempered: Standard practice to achieve optimal mechanical properties (e.g., Grade 11 and 22 are often normalized at 885–955°C, then tempered at 705–760°C).

Quenched and Tempered: Used for higher-strength grades (e.g., Grade 91) to improve hardness and toughness.

Welding Considerations:

Preheat temperatures depend on thickness and grade (e.g., Grade 22 may require preheating to 150–200°C).

PWHT is critical to relieve stress and improve ductility, especially for thick sections.

3.What is the equivalent of ASME SA387/SA387M?

The Equivalent materials of Sa 387 Gr 12 are BS 620B, UNS K11757, A387 / SA 387, DIN 13 CRMO 44, and EN 3 CRMO 45.

4.What are the application scenarios of ASME SA387/SA387M?

High-Temperature Pressure Vessels: Reactors, boilers, and heat exchangers in refineries and power plants.
Petrochemical Industry: Components in hydrogenation, cracking, and reforming units.
Power Generation: Steam generators and superheaters in fossil fuel plants.
Advanced Applications: Ultra-supercritical boilers (Grade 91, 122) in modern power plants.