... ,SCH20, SCH40,SCH80 ......XXS Quality StandardASTM A 53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated ... SCM 440 TK JIS G3444: STKM 11A, STKM 12, STKM 13, STKM 14, STKM 15, STKM 16, STKM 17, STKM 18STKM 19, STKM 20DIN 2391: St30Si, St30A1, ... Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc), Exterior Size Inspection ...