carbon steel seamless pipe made in china Itemcarbon steel seamless pipe,seamless carbon steel pipe,seamless carbon steel tube,carbon steel seamless tubeStandardAPI 5L,ASTM B36,JIS,DIN,GB6479,GB5310,GB9948,GB8163MaterialASTM A179/A192/A53/A106, API 5L X42/X52/X56/X60/X65/X70, API 5..