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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.2026-05-15
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ASTM A203/A203M nickel alloy steel plates are widely used in the manufacture of pressure vessels and low-temperature equipment.2026-05-09
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ASTM A202 Grade B is a chromium-manganese-silicon low-alloy steel tailored for high-pressure, medium-temperature pressure vessel applications.2026-04-30
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ASTM A202 Grade A is a critical chromium-manganese-silicon low-alloy steel plate specifically designed for welded pressure vessels and boilers operating at medium temperatures.2026-04-30
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ASTM A202 Pressure Vessel Steel Material and Grades:
Alloy System: **Chromium-Manganese-Silicon (Cr-Mn-Si)** Low-Alloy Heat-Resistant Steel2026-04-17
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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.