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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 -
SA302 Gr.B Steel Plate Standards and Origins:
SA302 Gr.B falls under the ASTM A302/A302M standard, jointly established by the American Society of Mechanical Engineers (ASME) and the American Society for Testing and Materials (ASTM).2026-09-18 -
In industrial sectors such as petroleum refining, chemical synthesis, and power generation, pressure vessels often require stable, long-term operation under conditions involving moderate temperatures, high pressures, and even corrosive media.2026-09-11
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Standard Classification: Complies with ASME SA302/ASTM A302 specifications, applicable to manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates for pressure vessels.2026-09-04
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Executive Standard: SA299 Gr. B steel plates comply with the ASME standard, specifically ASTM A299/A299M.2026-08-26
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SA302 Gr.B Steel Plate Standards and Origins:
SA302 Gr.B falls under the ASTM A302/A302M standard, jointly established by the American Society of Mechanical Engineers (ASME) and the American Society for Testing and Materials (ASTM). It complies with the ASME SA-302/SA-302M and ASTM A302 specifications, as well as general requirements for steel plates used in pressure vessels (such as ASTM A20).
Scope of Application: Primarily used in the manufacture of welded boilers, pressure vessels, nuclear power plant equipment (e.g., reactor pressure vessels), petrochemical equipment (e.g., reactors, heat exchangers, storage tanks), and high-temperature, high-pressure piping.
Chemical Composition of SA302 Gr.B Steel Plate:
Carbon (C): ≤0.25% (≤0.20% for thickness ≤25mm; ≤0.23% for thickness 25–50mm)
Manganese (Mn): 1.07%–1.62%
Silicon (Si): 0.13%–0.45%
Phosphorus (P) / Sulfur (S): ≤0.035% each
Molybdenum (Mo): 0.41%–0.64%
Nickel (Ni): 0.40%–0.70%
Alloy Characteristics: The combination of elements such as Mo and Ni enhances high-temperature strength, resistance to hydrogen corrosion, and general corrosion resistance, making it suitable for hydrogen-service environments (e.g., hydrogenation reactors).
Applications of SA302 Gr.B Steel Plate:
Petrochemical Industry: Reactors, heat exchangers, separators, oil and gas storage tanks, oil pipelines, and catalytic cracking units.
Power Industry: Boiler drums, subcritical unit components, high-temperature headers, nuclear power plant containment vessels, and steam generators.
Other Sectors: Aerospace (high-strength structural components), marine engineering (platforms, ship decks), bridges, hydraulic equipment (high-pressure water pipes, turbine spiral casings), and new energy equipment.
Comparison between SA302 Gr.B and SA302 Gr.C steel plates:
Compositional differences: The molybdenum content of Gr.B (0.30%–0.60%) is lower than that of Gr.C (0.40%–0.70%); Gr.B is suitable for medium-to-high temperature environments with mild hydrogen corrosion, whereas Gr.C is suitable for high-temperature scenarios involving severe hydrogen corrosion.
Impact testing: The test temperature is 0°C for Gr.B and -20°C for Gr.C, reflecting different low-temperature toughness requirements.
Yield strength: Gr.B ≥ 240 MPa and Gr.C ≥ 275 MPa; the strength grades differ.
SA302 Gr.B falls under the ASTM A302/A302M standard, jointly established by the American Society of Mechanical Engineers (ASME) and the American Society for Testing and Materials (ASTM). It complies with the ASME SA-302/SA-302M and ASTM A302 specifications, as well as general requirements for steel plates used in pressure vessels (such as ASTM A20).
Scope of Application: Primarily used in the manufacture of welded boilers, pressure vessels, nuclear power plant equipment (e.g., reactor pressure vessels), petrochemical equipment (e.g., reactors, heat exchangers, storage tanks), and high-temperature, high-pressure piping.
Chemical Composition of SA302 Gr.B Steel Plate:
Carbon (C): ≤0.25% (≤0.20% for thickness ≤25mm; ≤0.23% for thickness 25–50mm)
Manganese (Mn): 1.07%–1.62%
Silicon (Si): 0.13%–0.45%
Phosphorus (P) / Sulfur (S): ≤0.035% each
Molybdenum (Mo): 0.41%–0.64%
Nickel (Ni): 0.40%–0.70%
Alloy Characteristics: The combination of elements such as Mo and Ni enhances high-temperature strength, resistance to hydrogen corrosion, and general corrosion resistance, making it suitable for hydrogen-service environments (e.g., hydrogenation reactors).
Applications of SA302 Gr.B Steel Plate:
Petrochemical Industry: Reactors, heat exchangers, separators, oil and gas storage tanks, oil pipelines, and catalytic cracking units.
Power Industry: Boiler drums, subcritical unit components, high-temperature headers, nuclear power plant containment vessels, and steam generators.
Other Sectors: Aerospace (high-strength structural components), marine engineering (platforms, ship decks), bridges, hydraulic equipment (high-pressure water pipes, turbine spiral casings), and new energy equipment.
Comparison between SA302 Gr.B and SA302 Gr.C steel plates:
Compositional differences: The molybdenum content of Gr.B (0.30%–0.60%) is lower than that of Gr.C (0.40%–0.70%); Gr.B is suitable for medium-to-high temperature environments with mild hydrogen corrosion, whereas Gr.C is suitable for high-temperature scenarios involving severe hydrogen corrosion.
Impact testing: The test temperature is 0°C for Gr.B and -20°C for Gr.C, reflecting different low-temperature toughness requirements.
Yield strength: Gr.B ≥ 240 MPa and Gr.C ≥ 275 MPa; the strength grades differ.