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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
JIS G 3103 SB 450 steel,JIS G 3103 SB 450 steel Chemical Composition
JIS G 3103 SB 450 steel is mainly used to for manufacturing boilers, pressure vessels and pipes transporting hot liquids.
There are five main elements in JIS G 3103 SB 450 steel, carbon(C), manganese(Mn), phosphorus(P), sulfur(S) and silicon(Si).
JIS G 3103 SB 450 steel Chemical Composition specific data is as follows:
C % 0.08-0.2
Mn % 0.90-1.50
P % 0.025
S % 0.015
Si % 0.40
In general, sulfur in general is also harmful element. Sulfur makes steel produce heat, reduces the ductility and toughness, cause cracks in forging and rolling. Sulfur on welding performance is also negative, reduces corrosion resistance. So usually requires steel contain sulfur less than 0.055%, high quality steel requires less than 0.040%. Adding 0.08-0.20% sulfur to steel can improve the machinability, is usually called free cutting steel.
Through the above data, JIS G 3103 SB 450 steel contains 0.015% sulfur, 0.015% sulfur improves JIS G 3103 SB 450 steel machinability, JIS G 3103 SB 450 steel belongs to high quality steel and free cutting steel.
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