Trial production process of large tube blank of dual phase steel 00Cr22Ni5Mo3N was described, especially the remelting process to produce stainless steel of 650 mm×650 mm ingot with 2t electrode was investigated.

The forming limit of forward extrusion and cross rolling tube billet;

Uniformity of heat flux on tube billets heated in ring oven;

The relations between the dimension of tube billets and the shape of finished products were investigated and compared with the computational results.

Practice of Steelmaking Process for of N80 Grade Steel 36Mn2V for Oil well Tube Blank;

The production flow,after forged heat treatment and final heat treatment process for the high strength tube blank have been described in this article.

This paper introduces practice on producing quality carbon steel for seamless tube blank with LD-LF process in Hangzhou Iron & Steel Group Company.

Closed loop control of spray height in tubular preparation with reciprocating spray deposition process;

Deposition behavior and movement parameters optimization for reciprocating spray forming tubular;

Process principle of reciprocating spray forming large thick-wall tubular was analyzed.

To insure the spinning temperature,the interspace of pipe blank and mold is less than or equal to 0.

7Si alloy tubes are prepared by multi-layer spray deposition.

Through expermental investigations of tube central-upsetting, it is revealed that four typical modes of defor-mation in the inner wall-straight wall.

On the inner wall surface through the cracks of large thick-walled tube for chemical composition analysis,hardness,mechanical testing,metallography inspection and analysis.