Steel Pipe & TubeChina SAE1020 SAE1045 SAE4140 SAE4340 SAE4145h Hot Rolled Black Round Carbon Seamless Steel Tube Pipe Gas Pipe Steel Carbon Tube, Find details about China Gas Pipe Steel Carbon Tube, Round Carbon Seamless Steel Pipe from SAE1020 SAE1045 SAE4140 SAE4340 SAE4145h Hot Rolled Black Round Carbon Seamless Steel Tube Pipe Gas Pipe Steel Carbon Tube