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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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A203 Grade A is a nickel alloy steel specifically designed for ultra-low-temperature environments, classified as a steel plate for pressure vessels under the ASTM A203/A203M standard.
A203 Grade A Chemical Composition (%):
A203 Grade A Excellent Low-Temperature Toughness:
A203 Grade A steel plates maintain high impact toughness in environments ranging from -70°C to -101°C, with an average impact energy of ≥47 J (with individual values no lower than 70 J). When in the quenched and tempered condition, this capability extends to low-temperature operating conditions as low as -107°C.
A203 Grade A is widely utilized in the fabrication of critical equipment—such as inner shells for LNG storage tanks, main cryogenic heat exchangers, and liquid hydrogen storage and transport vessels—playing a pivotal role, particularly in polar oil and gas development, aerospace propellant storage, and superconducting magnet cooling systems.
A203 Grade A Chemical Composition (%):
| thickness | Element | C | Si | Mn | P | S | Ni |
| ≤50 | Min | - | 0.15 | - | - | - | 2.1 |
| Max | 0.17 | 0.4 | 0.7 | 0.025 | 0.025 | 2.5 | |
| ＞50~≤100 | Min | - | 0.15 | - | - | - | 2.1 |
| Max | 0.2 | 0.4 | 0.8 | 0.025 | 0.025 | 2.5 | |
| ＞100 | Min | - | 0.15 | - | - | - | 2.1 |
| Max | 0.23 | 0.4 | 0.8 | 0.025 | 0.025 | 2.5 |
A203 Grade A Excellent Low-Temperature Toughness:
A203 Grade A steel plates maintain high impact toughness in environments ranging from -70°C to -101°C, with an average impact energy of ≥47 J (with individual values no lower than 70 J). When in the quenched and tempered condition, this capability extends to low-temperature operating conditions as low as -107°C.
A203 Grade A is widely utilized in the fabrication of critical equipment—such as inner shells for LNG storage tanks, main cryogenic heat exchangers, and liquid hydrogen storage and transport vessels—playing a pivotal role, particularly in polar oil and gas development, aerospace propellant storage, and superconducting magnet cooling systems.