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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 -
ASTM A204/A204M Grade B molybdenum alloy steel plates for pressure vessels feature superior chemical composition and mechanical properties compared to Grade A2026-04-10
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As a molybdenum-alloy steel plate for pressure vessels under the ASTM A204/A204M standard, A204 Gr.A is a low-alloy, high-strength material specifically designed for service conditions involving moderate temperatures (≤400°C) and moderate-to-high pressure2026-03-31
Characteristics of G4109 SCMV2 Steel Plate
1. Pure Chemical Composition with Strict Impurity Control
Phosphorus (P) content: ≤0.010%, significantly lower than standard pressure vessel steels, reducing brittleness risks.
Sulfur (S) content: ≤0.005%, minimizing welding crack susceptibility and enhancing material toughness.
Gas content: Nitrogen ([N]) ≤70 ppm, oxygen ([O]) ≤15 ppm, and hydrogen ([H]) ≤2 ppm, controlled through vacuum degassing and other processes to reduce the impact of inclusions on performance.
2. Excellent Mechanical Properties for Medium- to High-Temperature Applications
Tensile strength: Significantly improved through quenching and tempering (QT) treatment, meeting high-pressure requirements for medium- to high-temperature pressure vessels.
Yield strength: ≥ specified value (refer to standards for exact figures), ensuring no plastic deformation under load.
Impact toughness: Maintains high toughness at low temperatures, preventing brittle fracture and making it suitable for engineering applications in extremely cold regions.
Plasticity and anisotropy: Plasticity and impact toughness are significantly enhanced after heat treatment, improving steel anisotropy and adapting to complex deformation needs.
3. Superior Processing and Welding Performance
Machinability: Supports flame cutting, plasma cutting, CNC bending, and other processes, with minimal springback and high dimensional stability after forming.
Weldability: Compatible with manual arc welding, submerged arc welding, gas shielded welding, and other methods, ensuring welding joint strength matches the base material while meeting toughness standards and reducing welding defect risks.
Cutting performance: Good machinability, rated at 70% (based on 1112 steel as 100%), suitable for mechanical processing.
4. Outstanding Corrosion and High-Temperature Resistance
Corrosion resistance: Enhanced through alloy element design and purity control, extending service life.
High-temperature resistance: Specifically designed for medium- to high-temperature pressure vessels, maintaining stable performance under elevated temperatures to prevent creep and relaxation.