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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/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. The specification covers multiple grades, including Gr.2, Gr.5, Gr.9, Gr.11, Gr.12, Gr.21, Gr.22 and Gr.91. Higher grade numbers indicate higher chromium and molybdenum contents, and therefore greater resistance to elevated temperature and corrosive service, making this series the mainstream material choice for high-end pressure equipment in the petrochemical and power industries.
In terms of alloy design, chromium forms a dense oxide film on the steel surface, significantly improving resistance to hydrogen attack and high-temperature oxidation, while molybdenum dissolves in the matrix to raise high-temperature strength and creep resistance. Working together, these two elements allow the plate to maintain stable mechanical properties in service conditions above 400 °C — a capability that plain carbon vessel steels cannot offer.
ASTM A387 plates are normally supplied in the normalized and tempered condition, while heavier sections or more demanding service requirements may call for the quenched and tempered condition, which provides a finer microstructure and a higher strength reserve. All plates are inspected for mechanical properties and soundness under the general requirements of ASTM A20, and through-thickness property uniformity is one of the key acceptance criteria for thick-wall applications.
In actual service, ASTM A387 steel plate is widely used for hydrocracking reactors, coke drums and heat exchanger shells in petrochemical plants; boiler drums and superheater support components in thermal power stations; and a variety of high-temperature, high-pressure vessels in coal chemical and natural gas processing installations.
For fabrication, the steel offers well-established weldability. Low-hydrogen consumables combined with preheating above 150 °C and post-weld stress-relief heat treatment are standard practice to prevent cold cracking. When purchasing, buyers are advised to specify the grade, delivery condition, ultrasonic examination level and third-party inspection requirements, and to request mill certificates in accordance with EN 10204 3.1/3.2, ensuring the material fully matches the governing design code.
In terms of alloy design, chromium forms a dense oxide film on the steel surface, significantly improving resistance to hydrogen attack and high-temperature oxidation, while molybdenum dissolves in the matrix to raise high-temperature strength and creep resistance. Working together, these two elements allow the plate to maintain stable mechanical properties in service conditions above 400 °C — a capability that plain carbon vessel steels cannot offer.
ASTM A387 plates are normally supplied in the normalized and tempered condition, while heavier sections or more demanding service requirements may call for the quenched and tempered condition, which provides a finer microstructure and a higher strength reserve. All plates are inspected for mechanical properties and soundness under the general requirements of ASTM A20, and through-thickness property uniformity is one of the key acceptance criteria for thick-wall applications.
In actual service, ASTM A387 steel plate is widely used for hydrocracking reactors, coke drums and heat exchanger shells in petrochemical plants; boiler drums and superheater support components in thermal power stations; and a variety of high-temperature, high-pressure vessels in coal chemical and natural gas processing installations.
For fabrication, the steel offers well-established weldability. Low-hydrogen consumables combined with preheating above 150 °C and post-weld stress-relief heat treatment are standard practice to prevent cold cracking. When purchasing, buyers are advised to specify the grade, delivery condition, ultrasonic examination level and third-party inspection requirements, and to request mill certificates in accordance with EN 10204 3.1/3.2, ensuring the material fully matches the governing design code.