A387Gr21CL1, also known as A387 Grade 21 Class 1, is a premium quality chromium-molybdenum alloy steel plate designed specifically for use in high-pressure and high-temperature applications such as pressure vessels and boilers. Manufactured to stringent ASTM A387M standards, this alloy steel plate combines exceptional strength, high-temperature resistance, and superior corrosion resistance, making it an ideal material for demanding industrial applications.

Chemical Composition

The A387Gr21CL1 steel plate boasts a well-balanced chemical composition that ensures optimal performance under extreme conditions. The key elements and their allowable ranges are as follows:

- Carbon (C): 0.05-0.17%

- Manganese (Mn): 0.40-0.65%

- Phosphorus (P): ≤0.025%

- Sulfur (S): ≤0.035%

- Silicon (Si): 0.15-0.40%

- Chromium (Cr): 0.80-1.15%

- Molybdenum (Mo): 0.45-0.60%

This precise blend of elements provides the plate with excellent creep strength, high-temperature stability, and resistance to oxidation and hydrogen attack.

Mechanical Properties

The mechanical properties of A387Gr21CL1 steel plate are equally impressive, ensuring reliable performance under heavy loads and extreme temperatures. Key mechanical properties include:

- Tensile Strength: Minimum value specified by the standard

- Yield Strength: ≥ 240 MPa

- Elongation (% in 2 inches or 50 mm): Sufficient to meet industry standards

These properties, combined with the steel's good toughness and ductility, make it suitable for use in critical components that require both strength and durability.

Heat Treatment

A387Gr21CL1 steel plates undergo rigorous heat treatment processes to achieve the desired microstructure and mechanical properties. The plates are typically supplied in the following heat treatment conditions:

- Annealed or normalized and tempered

- Custom heat treatment conditions can also be specified based on customer requirements

These heat treatment processes ensure that the steel plates have uniform properties and excellent resistance to embrittlement at high temperatures.

Size Range

A387Gr21CL1 steel plates are available in a wide range of thicknesses and dimensions to meet various application requirements. Typical thickness ranges from 8 mm to over 150 mm, with widths and lengths tailored to customer specifications. The plates can be cut to size or supplied in standard mill dimensions, ensuring flexibility and efficiency in material utilization.

Impact Testing

To ensure that A387Gr21CL1 steel plates meet the highest standards of toughness and impact resistance, they undergo rigorous impact testing. The plates are subjected to Charpy V-notch impact tests at specified temperatures, with results used to evaluate their suitability for use in various applications.

Main Application Scenarios

A387Gr21CL1 steel plates find extensive use in various industries where high-temperature and high-pressure resistance are critical. Key application areas include:

- Power generation: Used in boilers, steam generators, and other high-temperature components

- Petrochemical: Suitable for reactors, heat exchangers, and other equipment exposed to harsh chemicals and high temperatures

- Oil and gas: Utilized in pipelines, storage tanks, and other pressure vessels handling oil and gas products

- Refining: Ideal for hydrogenation reactors, distillation columns, and other refining equipment

TJC Steel Group Supply Case

TJC Steel Group, a leading supplier of premium steel products, offers A387Gr21CL1 steel plates to customers worldwide. Our plates undergo rigorous quality control checks, ensuring they meet or exceed industry standards.

Recent supply cases include:

- Supply of A387Gr21CL1 steel plates to a major power plant for use in boiler components, where the plates' high-temperature resistance and strength were critical factors.

- Provision of custom-cut A387Gr21CL1 plates to a petrochemical company for use in the construction of reactors and heat exchangers, requiring precise dimensional accuracy and excellent corrosion resistance.

- Delivery of A387Gr21CL1 steel plates to an oil refinery for use in hydrogenation reactors, where the plates' ability to withstand high hydrogen partial pressures and temperatures was essential.