... -Q235,Q345,X46,X52,X60,X70,X80,etc Hebei Haiqianwei Steel Pipe Co.,Ltd, uses the most advanced technology of JCOE LSAW ... , and the advantages of the product line are as below: high speed, high quality, low stress distribution, and low tolerance of size ... from 3m to 12.5m,steel grade could be simple carbon steel, special type steel and low alloy steel ,the steel grade could be up to max ...