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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 -
A285 Gr.C and SA285 Gr.C steel plates represent the same grade, though they are governed by different standards.2026-08-04
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SA283 Gr.B is a low-to-medium strength carbon structural steel plate conforming to the American Society of Mechanical Engineers (ASME) standard.2026-07-31
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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. It is typically used for welded components operating at temperatures up to 400°C, such as boiler drums and pressure vessels, where high strength at intermediate temperatures is required. Steel produced according to this standard comes in two grades: SA299 Gr.A and SA299 Gr.B.
SA299 Gr.A and SA299 Gr.B steel plates are typically supplied in the normalized or hot-rolled condition; plates with a thickness exceeding 50 mm are generally supplied in the normalized condition.
Comparison of chemical composition for SA299 Gr.A and SA299 Gr.B:
SA299 Gr.A (≤25 mm):
C: ≤0.26, Mn: 0.90–1.40, Si: 0.15–0.40, P: ≤0.035, S: ≤0.035
SA299 Gr.A (>25 mm):
C: ≤0.28, Mn: 0.90–1.50, Si: 0.13–0.45, P: ≤0.035, S: ≤0.035
SA299 Gr.B (≤25 mm):
C: ≤0.28, Mn: 0.90–1.40, Si: 0.15–0.40, P: ≤0.035, S: ≤0.035
SA299 Gr.B (>25 mm):
C: ≤0.30, Mn: 0.90–1.50, Si: 0.13–0.45, P: ≤0.035, S: ≤0.035
SA299 steel shall be killed steel and must meet the fine grain size requirements specified in the A20/A20M standard.
Comparison of mechanical properties for SA299 Gr. A and SA299 Gr. B steel plates:
Tensile strength: Gr. A → 75–95 (515–655); Gr. B → 80–100 (550–690)
Yield strength:
≤25 mm, Gr. A → ≥42 (290);
≤25 mm, Gr. B → ≥47 (325)
>25 mm, Gr. A → ≥40 (275);
>25 mm, Gr. B → ≥45 (310).
SA299 steel is characterized by high strength at intermediate temperatures, good ductility, and favorable heat treatment and welding properties.
SA299 Gr.A and SA299 Gr.B steel plates are typically supplied in the normalized or hot-rolled condition; plates with a thickness exceeding 50 mm are generally supplied in the normalized condition.
Comparison of chemical composition for SA299 Gr.A and SA299 Gr.B:
SA299 Gr.A (≤25 mm):
C: ≤0.26, Mn: 0.90–1.40, Si: 0.15–0.40, P: ≤0.035, S: ≤0.035
SA299 Gr.A (>25 mm):
C: ≤0.28, Mn: 0.90–1.50, Si: 0.13–0.45, P: ≤0.035, S: ≤0.035
SA299 Gr.B (≤25 mm):
C: ≤0.28, Mn: 0.90–1.40, Si: 0.15–0.40, P: ≤0.035, S: ≤0.035
SA299 Gr.B (>25 mm):
C: ≤0.30, Mn: 0.90–1.50, Si: 0.13–0.45, P: ≤0.035, S: ≤0.035
SA299 steel shall be killed steel and must meet the fine grain size requirements specified in the A20/A20M standard.
Comparison of mechanical properties for SA299 Gr. A and SA299 Gr. B steel plates:
Tensile strength: Gr. A → 75–95 (515–655); Gr. B → 80–100 (550–690)
Yield strength:
≤25 mm, Gr. A → ≥42 (290);
≤25 mm, Gr. B → ≥47 (325)
>25 mm, Gr. A → ≥40 (275);
>25 mm, Gr. B → ≥45 (310).
SA299 steel is characterized by high strength at intermediate temperatures, good ductility, and favorable heat treatment and welding properties.