20# seamless carbon steel pipe 1.MOQ 5MT 2.OD: 10.3-711.2mm ... 4.Application:boiler,heat exchanger,fluid pipes. 20# seamless carbon steel pipe Specifications Descriptionseamless carbon steel pipestandardGB/6479 , GB/5310,GB/T8162,GB/T8163 ... , ASTM A179,A192, A178-C, A210, STB340, STB410,STB510,DIN17175,Steel Grade10 ...