Japanese Standard (7)

 　　1. STK in STK400 is the abbreviation for carbon structural steel pipe. There is no corresponding brand in our country, and we can choose seamless steel pipes for structural purposes according to the national standard GB/T8162 according to the usage requirements.

　　2. STKM13A is also a carbon structural steel pipe, equivalent to the 20 # steel pipe in China's international GB/T8162 standard.

　　3. STKR400 is a carbon structural steel square or rectangular steel pipe, which does not have a corresponding brand in China. According to the usage requirements, seamless steel pipes for structural purposes can be selected according to the national standard GB/T8162.



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