Method for eliminating cracks of hot processed surface of 2205 dual-phase stainless steel middle plate

A duplex stainless steel, surface crack technology, applied in workpiece surface treatment equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of steel plate surface cracks and edge cracks, low rolling temperature, and many rolling passes. The effect of reducing scrap rate, shortening rolling time and reducing temperature loss

Inactive Publication Date: 2017-02-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the rolling process of duplex stainless steel 2205 medium plate has low starting temperature, many rolling passes, large temperature drop, low final rolling temperature, serious surface cracks and edge cracks, and the scrap rate exceeds 5%.

Method used

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  • Method for eliminating cracks of hot processed surface of 2205 dual-phase stainless steel middle plate
  • Method for eliminating cracks of hot processed surface of 2205 dual-phase stainless steel middle plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to technique of the present invention, carry out the method for plate rolling of duplex stainless steel 2205:

[0029]

[0030] (1) Blank selection and grinding

[0031] The specifications of the 2205 duplex stainless steel billet are: thickness × width × length = 160mm × 1238mm × 1800mm. A 30-mesh grinding wheel was used to fully grind the slab, and the grinding rate was 1.8%. After grinding, the surface of the slab had no visible defects with the naked eye, and the surface roughness was Ra=56 μm.

[0032] (2) billet heating

[0033] The ground slab is sent to the walking heating furnace for heating, and the slab is released from the furnace after passing through the preheating section, heating section and soaking section in sequence. The temperature in the preheating section is 1110-1140°C, the temperature in the heating section is 1160-1230°C, the temperature in the soaking section is 1230°C, and the dwell time is 160 minutes.

[0034] (3) High pressu...

Embodiment 2

[0043] According to technique of the present invention, carry out the method for plate rolling of duplex stainless steel 2205:

[0044]

[0045] (1) Blank selection and grinding

[0046] The specifications of the 2205 duplex stainless steel billet are: thickness × width × length = 180mm × 1550mm × 2500mm. A 30-mesh grinding wheel was used to fully grind the slab, and the grinding rate was 2.1%. After grinding, the surface of the slab had no visible defects with the naked eye, and the surface roughness was Ra=58 μm.

[0047] (2) billet heating

[0048] The ground slab is sent to the walking heating furnace for heating, and the slab is released from the furnace after passing through the preheating section, heating section and soaking section in sequence. The temperature in the preheating section is 1120-1150°C, the temperature in the heating section is 1180-1240°C, the temperature in the soaking section is 1235°C, and the dwell time is 180 minutes.

[0049] (3) High pressu...

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Abstract

The invention belongs to the technical field of stainless steel rolling, and particularly discloses a method for eliminating cracks of a hot processed surface of a 2205 dual-phase stainless steel middle plate. The method is characterized by comprising the steps that blank selection and grinding are carried out; a cast blank is heated, specifically, the temperature of a preheating section is 1100-1150 DEG C, the temperature of a heating section is 1150-1240 DEG C, the temperature of a soaking section is 1220-1240 DEG C, and for every 10 mm of the cast blank thickness, the furnace standing time is 9-10 min; scale removal is carried out with water of high pressure of 20-25 MPa; the initial rough rolling temperature is higher than 1150 DEG C, the reduction rate is smaller than 25%, rolling is carried out for 8-11 passes, and the thickness of an intermediate blank is 35-45 mm; and the initial finish rolling temperature is larger than 1050 DEG C, the final rolling temperature is larger than 950 DEG C, the reduction rate is smaller than 18%, and rolling is carried out for 8-12 passes. The method has the advantages that the blank specifications are selected reasonably, parameters such as rolling temperature and reduction rate are matched reasonably after grinding and optimal heating, and the surface crack defect of the 2205 dual-phase stainless steel middle plate is effectively avoided.

Description

technical field [0001] The invention relates to the field of duplex stainless steel rolling technology, in particular to a method for eliminating cracks on the thermally processed surface of 2205 duplex stainless steel plates. Background technique [0002] 2205 duplex stainless steel is a typical ultra-low C duplex (ferrite + austenite) stainless steel containing N and Mo elements, which has better performance than ordinary ferritic stainless steel and austenitic stainless steel. Compared with ferritic stainless steel, this steel has high toughness, low ductile-brittle transition temperature, excellent welding performance and corrosion resistance; compared with austenitic stainless steel, this steel has higher strength and good corrosion resistance. With its excellent performance, this steel is widely used in harsh service environments such as petrochemical, shipbuilding, papermaking and marine engineering. [0003] In the two-phase structure of duplex stainless steel, ferr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B1/34B21B45/08
CPCB21B1/22B21B1/34B21B45/08B21B2001/225
Inventor 李花兵张树才姜周华张彬彬冯浩苑胜龙
Owner NORTHEASTERN UNIV
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