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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 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. Typically supplied in a normalized and tempered condition, it serves as a primary material for equipment operating under medium-to-high temperatures and pressures.
In terms of mechanical properties, Class 1 features a tensile strength of 515–690 MPa and a yield strength of at least 310 MPa, maintaining stable strength and creep resistance at elevated temperatures. For applications requiring higher strength, Class 2 may be selected. Compared to Grade 22 (2-1/4Cr-1/2Mo), which has a higher chromium content, Grade 11 offers slightly lower corrosion and temperature resistance limits, but provides superior weldability and cost-effectiveness.
This steel plate is widely used in the petrochemical industry for components such as hydroprocessing heat exchangers, coking towers, and reactor shells, as well as in power plant equipment, including boiler drums and high-temperature headers. The plates undergo mechanical testing and ultrasonic examination in accordance with ASTM A20 standards, with particular emphasis on the uniformity of properties through the thickness.
During fabrication and welding, the use of low-hydrogen consumables is recommended, along with preheating to at least 150°C and post-weld heat treatment (PWHT) for stress relief. When procuring this material, it is essential to specify the grade and class, delivery condition, ultrasonic testing requirements, and the need for an EN 10204 3.1 or 3.2 inspection certificate to ensure the material aligns with design specifications.
In terms of mechanical properties, Class 1 features a tensile strength of 515–690 MPa and a yield strength of at least 310 MPa, maintaining stable strength and creep resistance at elevated temperatures. For applications requiring higher strength, Class 2 may be selected. Compared to Grade 22 (2-1/4Cr-1/2Mo), which has a higher chromium content, Grade 11 offers slightly lower corrosion and temperature resistance limits, but provides superior weldability and cost-effectiveness.
This steel plate is widely used in the petrochemical industry for components such as hydroprocessing heat exchangers, coking towers, and reactor shells, as well as in power plant equipment, including boiler drums and high-temperature headers. The plates undergo mechanical testing and ultrasonic examination in accordance with ASTM A20 standards, with particular emphasis on the uniformity of properties through the thickness.
During fabrication and welding, the use of low-hydrogen consumables is recommended, along with preheating to at least 150°C and post-weld heat treatment (PWHT) for stress relief. When procuring this material, it is essential to specify the grade and class, delivery condition, ultrasonic testing requirements, and the need for an EN 10204 3.1 or 3.2 inspection certificate to ensure the material aligns with design specifications.