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ASTM A387 Grade 11 Class 2 (corresponding to ASME SA387 Gr. 11 Cl. 2) is a high-strength variant of 1-1/4Cr-1/2Mo chromium-molybdenum alloy steel plate.2026-11-03
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ASTM A387 Grade 11 Class 1 (equivalent to ASME SA387 Gr. 11 Cl. 1) is a 1-1/4Cr-1/2Mo chromium-molybdenum alloy steel plate designed for use in welded boilers and pressure vessels.2026-10-26
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ASTM A387/A387M is the American standard specification for chromium-molybdenum alloy steel plates intended for welded boilers and pressure vessels, and it is commonly applied together with ASME SA387 for code construction.2026-10-19
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ASTM A302 Grade D steel plate is a manganese-molybdenum-nickel (Mn-Mo-Ni) alloy steel plate manufactured for welded boilers and pressure vessels operating under moderate to elevated temperature.2026-10-12
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Chemical composition of SA302 Gr.C steel plate:
Carbon (C): ≤0.25% (requirements vary by thickness; e.g., ≤0.20% for thickness ≤25mm)2026-09-25
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ASTM A387 Grade 11 Class 2 (corresponding to ASME SA387 Gr. 11 Cl. 2) is a high-strength variant of 1-1/4Cr-1/2Mo chromium-molybdenum alloy steel plate. It is primarily used for the fabrication of welded boilers and pressure vessels operating under high-temperature and high-pressure conditions and is typically supplied in a normalized and tempered state.
Compared to the Class 1 version of the same grade, Class 2 offers higher strength—with a tensile strength of 585–760 MPa and a yield strength of at least 415 MPa—making it suitable for equipment with thicker walls and higher design stress. However, this comes at the cost of slightly reduced ductility and a narrower welding process window, necessitating stricter control over heat treatment and welding parameters.
This steel plate exhibits excellent resistance to hydrogen-induced corrosion, high-temperature oxidation, and creep. The chromium content facilitates the formation of a dense oxide film that protects against environmental degradation, while the molybdenum content ensures strength stability at temperatures above 400°C. Consequently, it is widely used in oil refining, fertilizer production, and coal-chemical industries—for components such as hydroprocessing reactors, heat exchanger shells, coke drums, and high-temperature pressure-bearing parts in power plant boilers.
The steel plates are subject to mechanical testing and ultrasonic examination in accordance with ASTM A20; for thicker plates, uniformity of properties through the thickness must also be considered. During fabrication, low-hydrogen welding consumables should be used, with a preheat temperature generally no lower than 150°C. Post-weld stress-relief heat treatment is essential to prevent cold cracking and embrittlement in the heat-affected zone (HAZ).
When procuring this material, it is advisable to clearly specify the grade, class (Class 2), delivery condition, ultrasonic testing requirements, and any third-party inspection mandates. Furthermore, the actual mechanical property data provided in the material test report (MTR) should be verified to ensure that Class 1 material is not supplied in place of Class 2.
Compared to the Class 1 version of the same grade, Class 2 offers higher strength—with a tensile strength of 585–760 MPa and a yield strength of at least 415 MPa—making it suitable for equipment with thicker walls and higher design stress. However, this comes at the cost of slightly reduced ductility and a narrower welding process window, necessitating stricter control over heat treatment and welding parameters.
This steel plate exhibits excellent resistance to hydrogen-induced corrosion, high-temperature oxidation, and creep. The chromium content facilitates the formation of a dense oxide film that protects against environmental degradation, while the molybdenum content ensures strength stability at temperatures above 400°C. Consequently, it is widely used in oil refining, fertilizer production, and coal-chemical industries—for components such as hydroprocessing reactors, heat exchanger shells, coke drums, and high-temperature pressure-bearing parts in power plant boilers.
The steel plates are subject to mechanical testing and ultrasonic examination in accordance with ASTM A20; for thicker plates, uniformity of properties through the thickness must also be considered. During fabrication, low-hydrogen welding consumables should be used, with a preheat temperature generally no lower than 150°C. Post-weld stress-relief heat treatment is essential to prevent cold cracking and embrittlement in the heat-affected zone (HAZ).
When procuring this material, it is advisable to clearly specify the grade, class (Class 2), delivery condition, ultrasonic testing requirements, and any third-party inspection mandates. Furthermore, the actual mechanical property data provided in the material test report (MTR) should be verified to ensure that Class 1 material is not supplied in place of Class 2.