JIS G3103 is a Japanese industrial standard for rolled steels for boiler and pressure vessel applications, commonly designated as SB grades . These steels are engineered to withstand high temperatures and pressures in boilers, heat exchangers, and pressure containers.
The standard specifies chemical composition, mechanical properties, and mandatory impact testing to ensure safety and durability. SB steels offer excellent weldability, formability, and creep resistance, making them ideal for critical thermal equipment. While primarily used in Japan, JIS G3103 aligns with international standards, facilitating global compatibility.
The standard reflects Japan's rigorous engineering traditions, emphasizing reliability and performance in high-stress environments.
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