China JIS G3445 STKM 11A STKM12A STKM13A Steel Tubes stkm 11a 13a 13b 13c 14a jis g3445 seamless steel pipe
STKM 11A Seamless Tubes Application. JIS G3445 STKM 11A, STKM 12A, STKM 12C, STKM 13A, STKM 13C, STKM 15A, STKM 15C, STKM 17A, STKM 17C carbon steel tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts. Grade and Designation. The grade and designation of the tube shall be as given as follows table.
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