A387-11 Alloy Steel Plate

A387-11 is a chromium-molybdenum (Cr-Mo) alloy steel plate specified under the ASTM A387 standard, designed for high-temperature and pressure applications. As a grade within the A387 series, it is valued for its excellent creep resistance, oxidation resistance, and mechanical stability at elevated temperatures, making it a critical material in industries where components operate under extreme thermal and pressure conditions.

Chemical Composition & Key Properties:

Alloying Elements: The primary alloying elements are chromium (Cr, typically 1.00-1.50%) and molybdenum (Mo, 0.44-0.65%). Chromium enhances oxidation and corrosion resistance, while molybdenum improves high-temperature strength and creep resistance-critical for withstanding prolonged stress at high temperatures.

Mechanical Properties:

Tensile strength: Minimum 415 MPa

Yield strength: Minimum 205 MPa

Excellent toughness and ductility, even after long-term exposure to high temperatures.

Heat treatability: It can be normalized and tempered to optimize its microstructure for high-temperature performance.

 

 

 

 

 

 

 

Standards & Applications:

Specified Standard: ASTM A387/A387M, which outlines requirements for chromium-molybdenum alloy steel plates intended for welded pressure vessels and boilers.

Typical Applications:

Power Generation: Used in boiler components, steam pipes, and pressure vessels in coal-fired, gas-fired, and nuclear power plants, where resistance to high-temperature steam and pressure is essential.

Petrochemical Industry: Employed in reactors, heat exchangers, and piping systems that handle high-temperature, high-pressure hydrocarbons and corrosive media.

Refining Sector: Suitable for equipment in oil refineries, such as catalytic crackers and distillation units, which operate under extreme thermal and chemical conditions.

 

 

 

 

 

 

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