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.

ASTM A203/A203M nickel alloy steel plates are widely used in the manufacture of pressure vessels and low-temperature equipment.

ASTM A202 Grade B is a chromium-manganese-silicon low-alloy steel tailored for high-pressure, medium-temperature pressure vessel applications.

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.

ASTM A202 Pressure Vessel Steel Material and Grades:
Alloy System: **Chromium-Manganese-Silicon (Cr-Mn-Si)** Low-Alloy Heat-Resistant Steel