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ASTM A203 Grade B is a nickel-alloy steel plate designed for low-temperature pressure vessels.2026-05-22
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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 A203 Grade B is a nickel-alloy steel plate designed for low-temperature pressure vessels. It has excellent low-temperature toughness,good weldability, and reliable performance down to -60°C. Commonly used in petrochemical plants, LNG storage tanks, and cryogenic equipment, this article covers its composition, properties, heat treatment, equivalents, and applications.
ASTM A203 Grade B Chemical Composition:
The steel contains 0.17–0.23% C, 0.70–1.35% Mn, 0.15–0.40% Si, and 2.25–2.75% Ni, with low P and S. Nickel is the key element – it significantly improves low-temperature impact toughness.
ASTM A203 Grade B Mechanical Properties:
Typical requirements include tensile strength of 480–620 MPa, yield strength ≥275 MPa, and elongation ≥21%. Impact testing is performed at -60°C to verify toughness.
ASTM A203 Grade B Heat Treatment:
ASTM A203 Grade B is typically normalized (or normalized and tempered) to refine grain structure and enhance cryogenic performance – unlike quenched and tempered steels.
ASTM A203 Grade B Weldability:
It can be welded using SMAW, GMAW, or SAW. Preheating is generally not required. Post-weld heat treatment (PWHT) depends on thickness and design code.
International Equivalents
Similar grades include 11MnNi5-3 (EN), SPV 315 / SL3N (JIS), and 09MnNiDR (GB). Direct substitution without design verification is not recommended.
ASTM A203 Grade B applications:
LNG tank components, low-temperature reactors, separators, cryogenic piping (plate form), and CO₂ absorber columns.
ASTM A203 Grade B is an economical, weldable, and low-temperature resistant steel plate ideal for pressure vessels operating around -60°C. It is a smart choice for moderate thickness applications requiring reliable cryogenic toughness.
ASTM A203 Grade B Chemical Composition:
The steel contains 0.17–0.23% C, 0.70–1.35% Mn, 0.15–0.40% Si, and 2.25–2.75% Ni, with low P and S. Nickel is the key element – it significantly improves low-temperature impact toughness.
ASTM A203 Grade B Mechanical Properties:
Typical requirements include tensile strength of 480–620 MPa, yield strength ≥275 MPa, and elongation ≥21%. Impact testing is performed at -60°C to verify toughness.
ASTM A203 Grade B Heat Treatment:
ASTM A203 Grade B is typically normalized (or normalized and tempered) to refine grain structure and enhance cryogenic performance – unlike quenched and tempered steels.
ASTM A203 Grade B Weldability:
It can be welded using SMAW, GMAW, or SAW. Preheating is generally not required. Post-weld heat treatment (PWHT) depends on thickness and design code.
International Equivalents
Similar grades include 11MnNi5-3 (EN), SPV 315 / SL3N (JIS), and 09MnNiDR (GB). Direct substitution without design verification is not recommended.
ASTM A203 Grade B applications:
LNG tank components, low-temperature reactors, separators, cryogenic piping (plate form), and CO₂ absorber columns.
ASTM A203 Grade B is an economical, weldable, and low-temperature resistant steel plate ideal for pressure vessels operating around -60°C. It is a smart choice for moderate thickness applications requiring reliable cryogenic toughness.