Super austenitic stainless steel pipe manufacturing process

A technology of austenitic stainless steel and manufacturing technology, applied in metal rolling and other directions, can solve the problems of long manufacturing cycle, difficulty in producing large-scale products, high processing cost, etc., and achieve the effect of reducing manufacturing cost and manufacturing cycle

Inactive Publication Date: 2011-12-14
SICHUAN SANZHOU SPECIAL STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of large deformation resistance (its deformation resistance is 1.5 to 2 times that of 300 series austenitic stainless steel) and narrow optimal deformation temperature range, hot extrusion, Cold processing manufacturing process, high processing cost, long manufacturing cycle, and the maximum outer diameter of the manufactured product is about 219mm, it is difficult to produce large-scale products that meet the demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The preparation specification is 406*25mm UNS N08904 super austenitic stainless steel pipe manufacturing process, comprises the following steps:

[0024] A. Billet preparation

[0025] The forging billet is used as the billet. In order to ensure the quality of the forging billet, the following processing steps are adopted in sequence: electric furnace smelting, LF refining, vacuum degassing (VD), mold injection, electroslag remelting, forging (550mm round billet), heat treatment, machining (500mm outer diameter, 150mm inner hole);

[0026] The core of the tube billet is drilled with a diameter of 150 mm. The outer surface of the billet is turned to remove the iron oxide scale to ensure that there is no black scale, pits, cracks and inclusions on the surface, and the flaw detection is qualified;

[0027] B. Blank heating

[0028] The tube blank is heated to 1230±10°C by the trolley furnace according to the heating system, and the total heating time is 20 ...

Embodiment 2

[0039] Embodiment 2: the preparation specification is 273*20mm UNS N08925 super austenitic stainless steel pipe manufacturing process, comprises the following steps:

[0040] A. Billet preparation

[0041] The forging billet is used as the billet. In order to ensure the quality of the forging billet, the following processing steps are adopted in sequence: electric furnace smelting, LF refining, vacuum refining (VOD), mold injection, electroslag remelting, forging (350mm round billet), heat treatment, machining ( 320mm outer diameter, 80 mm inner hole);

[0042] The core of the tube billet is drilled with a diameter of 80 mm. The outer surface of the billet is turned to remove the iron oxide scale to ensure that there is no black scale, pits, cracks and inclusions on the surface, and the flaw detection is qualified;

[0043] B. Blank heating

[0044] The tube blank is heated to 1200±10°C by the ring furnace according to the heating system, and the total heating time is 15 hou...

Embodiment 3

[0055] Embodiment 3: The preparation specification is: 377*30mmUNS N08926 super austenitic stainless steel pipe manufacturing process, including the following steps:

[0056] A. Billet preparation

[0057] The forging billet is used as the billet. In order to ensure the quality of the forging billet, the following processing steps are adopted in sequence: electric furnace smelting, LF refining, out-of-furnace refining (AOD), mold injection, electroslag remelting, forging (500mm round billet), heat treatment, machining (470mm outer diameter, 100mm inner hole);

[0058] The core of the tube billet is drilled with a diameter of 100 mm. The outer surface of the billet is lathe-turned to remove the iron oxide scale to ensure that there is no black scale, pits, cracks, and inclusions on the surface, and the flaw detection is qualified;

[0059] B. Blank heating

[0060] The tube blank is heated to 1240±10°C by the trolley furnace according to the heating system, and the total heat...

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PUM

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Abstract

The invention discloses a manufacturing process of a super austenitic stainless steel pipe, which comprises the following steps: A, billet preparation: the steel ingot is forged and formed after electroslag remelting and punched; B, the pipe billet is heated to 1190-1250°C; C. The tube billet is cross-rolled and pierced by a cross-rolling piercer; D. Tube rolling by a periodic tube mill; E. Solution treatment; F. Deep processing of waste tubes; G. Finishing and grinding to finished products. The beneficial effect of the invention is that the outer diameter of the product is greatly increased to 406mm by adopting the manufacturing process of piercing and periodic rolling, and the manufacturing cost and the manufacturing cycle are reduced at the same time.

Description

technical field [0001] The invention relates to the technical field of stainless steel seamless steel pipe manufacturing technology, in particular to a super austenitic stainless steel pipe manufacturing technology. Background technique [0002] 900 series (UNS N08904, UNS N08925, UNS N08926) super austenitic stainless steel is an ultra-low carbon high-alloyed austenitic stainless steel, which is a complete austenitic structure and has good resistance to pitting corrosion and crevice corrosion. , High resistance to stress corrosion cracking, good resistance to intergranular corrosion, good machinability and weldability. However, due to the characteristics of large deformation resistance (its deformation resistance is 1.5 to 2 times that of 300 series austenitic stainless steel) and narrow optimal deformation temperature range, hot extrusion, The cold processing manufacturing process has high processing cost and long manufacturing cycle, and the maximum outer diameter of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B23/00
Inventor 刘珂周贵禄李文农郭海
Owner SICHUAN SANZHOU SPECIAL STEEL PIPE
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