Production method for improving surface quality of Cr-Mo steel requiring low-temperature impact performance

A low-temperature impact and surface quality technology, applied in the field of metallurgy, can solve the problems of increasing steel plate surface defects, complex production process, and increasing the difficulty of removing iron oxide scale on the steel plate surface

Pending Publication Date: 2021-05-18
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, for Cr-Mo steel that requires low-temperature impact performance, a certain amount of Ni needs to be added in the composition design. The addition of Ni element will obviously increase the difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, Cr-Mo steel, steel plate composition P: 0.005%, Sn: 0.003%, Ni: 0.009%, C: 0.13%, Cr: 1.5%, Mo: 0.65%, and the remaining alloy elements and mass percentages meet GB / T 713-2014 requirements. The production method for improving the surface quality of the above-mentioned Cr-Mo steel includes smelting, heating, rolling, shot blasting, and heat treatment processes. The steps of each process are as follows:

[0020] (1) The electromagnetic stirring process is adopted when the slab is poured, and the electromagnetic stirring torque is controlled at 150×10 -4 N / m;

[0021] (2) During the blank heating process, the blank heating temperature is 1220°C, and the holding time is 120min;

[0022] (3) During the rolling process, the rough rolling adopts a large reduction rolling process, and the rolling reduction in each pass is 25mm. The rough rolling is 1.7 times the thickness of the finished steel plate and then the finishing rolling is carried out. The starting...

Embodiment 2

[0027] In this example, Cr-Mo steel, steel plate composition P: 0.002%, Sn: 0.001%, Ni: 0.002%, C: 0.1%, Cr: 1.4%, Mo: 0.55%, and the remaining alloy elements and mass percentages meet GB / T 713-2014 requirements. The production method for improving the surface quality of the above-mentioned Cr-Mo steel includes smelting, heating, rolling, shot blasting, and heat treatment processes. The steps of each process are as follows:

[0028] (1) The electromagnetic stirring process is adopted when the slab is poured, and the electromagnetic stirring torque is controlled at 120×10 -4 N / m;

[0029] (2) During the blank heating process, the blank heating temperature is 1200°C, and the holding time is 180min;

[0030] (3) During the rolling process, the rough rolling adopts a large-reduction rolling process, and the rolling reduction in each pass is 20 mm. The rough rolling is 1.5 times the thickness of the finished steel plate and then the finish rolling. The finish rolling start tempe...

Embodiment 3

[0035] Cr-Mo steel in this example, steel plate composition P: 0.004%, Sn: 0.002%, Ni: 0.004%, C: 0.13%, Cr: 1.42%, Mo: 0.59%, and the remaining alloy elements and mass percentages meet GB / T 713-2014 requirements. The production method for improving the surface quality of the above-mentioned Cr-Mo steel includes smelting, heating, rolling, shot blasting, and heat treatment processes. The steps of each process are as follows:

[0036] (1) The electromagnetic stirring process is adopted when the slab is poured, and the electromagnetic stirring torque is controlled at 134×10 -4 N / m;

[0037] (2) During the blank heating process, the blank heating temperature is 1212°C, and the holding time is 137min;

[0038] (3) During the rolling process, the rough rolling adopts a large reduction rolling process, and the rolling reduction in each pass is 23mm. The rough rolling is 1.51 times the thickness of the finished steel plate and then the finishing rolling. The starting temperature o...

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Abstract

The invention discloses a production method for improving the surface quality of Cr-Mo steel requiring low-temperature impact performance, and belongs to the technical field of metallurgy. The production method comprises the procedures of smelting, heating, rolling, shot blasting and heat treatment. In the smelting procedure, an electromagnetic stirring process is adopted during pouring; in the heating procedure, the heating temperature is 1200-1220 DEG C, and the heat preservation time is 120-180 minutes; the rolling procedure adopts the processes of rough rolling, finish rolling and cooling after rolling; the residual oxygen content in a heating furnace during normalizing treatment in the heat treatment procedure is 0.005-0.01%; and the Cr-Mo steel adopts the component design of low Ni, P, Sn and C and high Cr and Mo. The Cr-Mo steel plate produced through the method is good in surface quality, low in grinding rate, uniform in steel plate structure, obviously improved in impact performance and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method for improving the surface quality of Cr-Mo steel requiring low-temperature impact performance. Background technique [0002] Due to the high content of alloy elements in Cr-Mo steel for pressure vessels, many surface quality problems are prone to occur in the steel plate production process from smelting, pouring, rolling, and heat treatment processes, mainly including surface oxide scale, surface cracks, folding, pressing, etc. Defects such as pits and foreign matter intrusion. [0003] Steel plate surface defects are very harmful to equipment such as hydrogenation reactors, hot high-pressure separators, Fischer-Tropsch reactors, and boilers with Cr-Mo steel as the main material, mainly manifested in: 1) Steel plate surface oxidation The iron sheet seriously affects the coating performance of the steel plate, especially for the equipment that r...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/00C22C38/44C21D1/28C21D6/00C21D8/02
CPCC21D1/28C21D6/004C21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/008C22C38/44
Inventor 赵国昌李杰侯敬超龙杰庞辉勇袁锦程吴艳阳牛红星尹卫江李样兵王东阳顾自有赵紫娟岳欣欣
Owner WUYANG IRON & STEEL
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