Stretch Planishing and Drawing Combined Process (SPDCP) is a high efficient process technology of a non-mandril model for the extra long and non-seamed conical pipe-the nonferrous special type of profiled pipe.

In order to strengthen the oil-field user’s confidence in the ERW casing made in China,the contrast study of the dimension control,residual stress,and pipe collapse pressure between ERW and seamless casing was conducted in this paper.

Present Status and Development of Alloy Steel Seamless Tube;

Analysis on stretch reducing rolling process of seamless tube by FEM;

Development of round billet of heat resistant stainless steel seamless tube for high pressure boiler

Technological transformation of enterprises produced medium diameter seamless steel tube with cold drawn processing;

Discussion on development countermeasures to seamless steel tube technical equipment in China;

Present situation analysis of Chinese seamless steel tube technology equipment;

Discussion on the developing direction of steel tubes by comparing processing of seamless tube and welded tube;

China steel tube trade is being a turning point, concerning which should take the first place between seamless tube and welded tube.

This paper describes the deformational characteristic of different kinds of cross-rolling process, sumerizes the law of development cross- rolling elongation and reveals the tendency of hot elongated accurate seamless tube.

Finite element analysis on locally and radically die plastic forming of the seamless steel pipe;

Study of heat treatment process of 1Cr5Mo alloy seamless steel pipe;

Analysis for Inside Cold-Bending Fracture of SA299 Heavy Calibre Thick-Wall Seamless Steel Pipes;