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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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SA299 is a carbon-manganese-silicon steel plate designed for pressure vessels—often referred to as "gas drum steel" under US standards.2026-08-19
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ntroduction to SA299 Gr.A Steel Plate:
SA299 Gr.A is a steel plate grade designated for boilers and pressure vessels under American standards.2026-08-11
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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.
Grade Designation Structure:
SA302 serves as the base strength identifier (not the precise yield strength value); "Gr" stands for "Grade"; and the suffix letters (A, B, C, D) distinguish differences in chemical composition and properties.
Standard Classification: Complies with ASME SA302/ASTM A302 specifications for manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates intended for pressure vessels.
Grade Designation Structure:
"SA302" indicates the base strength level (not the exact yield strength value); "Gr" stands for Grade; and the suffix letters (A/B/C/D) distinguish differences in chemical composition and mechanical properties.
Comparison of Characteristics for Common SA302 Grades:
Gr. B: Low-carbon design (C ≤ 0.25%), Mn-Mo-Nb alloy system; yield strength ≥ 345 MPa; excellent impact toughness at -30°C; applications include LNG storage tanks and petrochemical reactors.
Gr. C: Nickel-strengthened (Ni 0.40–0.70%); tensile strength 550–690 MPa; resistant to high-temperature creep and hydrogen corrosion; applications include hydrogenation reactors, nuclear power pressurizers, and thermal power boilers.
Gr. D: Multi-element micro-alloyed (Cr/Ni/V-Nb); cryogenic toughness down to -75°C; 30% improvement in neutron irradiation resistance; applications include Generation III nuclear pressure vessels and Generation IV reactor pressure boundaries.
Chemical Composition and Mechanical Properties of SA302 Steel:
Purity: P ≤ 0.025%, S ≤ 0.025% (some grades require ≤ 0.005%).
Strengthening elements: Based on Mn (1.15–1.62%) and Mo (0.45–0.65%); Grade D includes the addition of Cr (0.15–0.25%).
Mechanical Properties of SA302 Steel:
Strength: Tensile strength 550–720 MPa (Grade D reaches 620–650 MPa);
Toughness: Impact energy ≥ 34 J at -20°C (Grade C), ≥ 60 J at -75°C (Grade D);
Elongation: ≥ 18% (50 mm gauge length).
Grade Designation Structure:
SA302 serves as the base strength identifier (not the precise yield strength value); "Gr" stands for "Grade"; and the suffix letters (A, B, C, D) distinguish differences in chemical composition and properties.
Standard Classification: Complies with ASME SA302/ASTM A302 specifications for manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates intended for pressure vessels.
Grade Designation Structure:
"SA302" indicates the base strength level (not the exact yield strength value); "Gr" stands for Grade; and the suffix letters (A/B/C/D) distinguish differences in chemical composition and mechanical properties.
Comparison of Characteristics for Common SA302 Grades:
Gr. B: Low-carbon design (C ≤ 0.25%), Mn-Mo-Nb alloy system; yield strength ≥ 345 MPa; excellent impact toughness at -30°C; applications include LNG storage tanks and petrochemical reactors.
Gr. C: Nickel-strengthened (Ni 0.40–0.70%); tensile strength 550–690 MPa; resistant to high-temperature creep and hydrogen corrosion; applications include hydrogenation reactors, nuclear power pressurizers, and thermal power boilers.
Gr. D: Multi-element micro-alloyed (Cr/Ni/V-Nb); cryogenic toughness down to -75°C; 30% improvement in neutron irradiation resistance; applications include Generation III nuclear pressure vessels and Generation IV reactor pressure boundaries.
Chemical Composition and Mechanical Properties of SA302 Steel:
Purity: P ≤ 0.025%, S ≤ 0.025% (some grades require ≤ 0.005%).
Strengthening elements: Based on Mn (1.15–1.62%) and Mo (0.45–0.65%); Grade D includes the addition of Cr (0.15–0.25%).
Mechanical Properties of SA302 Steel:
Strength: Tensile strength 550–720 MPa (Grade D reaches 620–650 MPa);
Toughness: Impact energy ≥ 34 J at -20°C (Grade C), ≥ 60 J at -75°C (Grade D);
Elongation: ≥ 18% (50 mm gauge length).