For automatic setting of the roll position as per the targeted value in the process of size change- over of the HFW pipe mill, and for reducing material loss, a Cross Weld Tracking(CWT) model is developed by Baoshan Iron & Steel Corp.

Described here is an induction coil positioning and weld seam tracking system provided to the medium frequency annealing device as incorporated into the HFW pipe production line of Baoshan Iron and Steel Co.

This article introduces the production process of N80Q,P110 grade casing and tubing produced by HFW pipe.

This requires line pipe materials to have higher strength with properties suitable for the environment,such as high deformability or sour gas resistance.

Through the corrosion dent pile weld test on line pipe,hardness and distance from weld fine crystal position to sample back is applied to predict HIC and arc burn.

A detailed comparative analysis is made of the technical standards for oil and gas line pipes widely used in and outside China today.

Analysis of Influence by Residual Stress on Manufacture Process of ERW Linepipe;

R & D of X56 Submarine Seamless Steel Linepipe;

X60 seamless steel line pipe for sea floor researched and developed by TPCO not only has excellent strength and toughness but also has good corrosion resistance, and its physical and chemical performance index have reached the requirement of grade X60.

Low and inconsistent impact energy of the weld seam is regarded as a major technological prob-lem relating to manufacturing of ERW linepipe.