This standard specifies alloy steel forged products (hereinafter referred to as forged steel products) that take weldability into consideration for pressure vessels used at high temperatures and their parts.
JIS G 3203:1988 history
2008JIS G 3203 AMD 1:2008 Alloy steel forgings for pressure vessels for high-temperature service (Amendment 1)
1988JIS G 3203:1988 Alloy steel forgings for pressure vessels for high-temperature service