Hot rolling process for producing electrical steel free of metal flow stacking defect

An electrical steel, metal-free technology, applied in metal rolling, temperature control and other directions, can solve problems such as affecting product benefits, increasing manufacturing costs, insufficient quality control stability, etc., to facilitate the hot rolling process and improve the quality of steel strips , The effect of improving the production qualification rate

Inactive Publication Date: 2018-03-20
NINGBO IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In response to such defects, most steel mills use edge heating and rolling, controlling the temperature system or adopting methods such as adjusting the pass type to solve the problem. Although there are certain effects, du

Method used

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  • Hot rolling process for producing electrical steel free of metal flow stacking defect

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the actual production process, the chemical composition weight percentage of electrical steel is: C≤0.0025%, Si: 0.38%, Mn: 0.31%, P: 0.07%, S: 0.006%, Als: 0.004%, N: 0.004%, and the rest For iron and unavoidable impurity elements.

[0028] The present invention implements production method and comprises the following processing steps:

[0029] Converter smelting, argon blowing at Ar station, RH vacuum refining treatment, molten steel components treated according to the above requirements, and continuous casting into a slab with a thickness of 230mm and a width of 1250mm.

[0030] Specifications of hot rolling orders: thickness 2.5mm, width 1244mm steel strip, side pressure from slab to finished product 6mm.

[0031] In the hot rolling process, the slab is heated to 1140°C, the final rolling temperature is 890°C, and the coiling temperature is 570°C.

[0032] Implementation effect of the present invention

[0033] Finished product inspection Product quality: elec...

Embodiment 2

[0035] In the actual production process, the chemical composition weight percentage of electrical steel is: C≤0.0035%, Si: 0.43%, Mn: 0.25%, P: 0.065%, S: 0.007%, Als: 0.0035%, N: 0.0045%, and the rest For iron and unavoidable impurity elements.

[0036] The present invention implements production method and comprises the following processing steps:

[0037] Converter smelting, argon blowing at Ar station, RH vacuum refining treatment, molten steel components treated according to the above requirements, and continuous casting into a slab with a thickness of 230mm and a width of 1300mm.

[0038] Specifications of hot rolling orders: thickness 2.5mm, width 1274mm steel strip, side pressure from slab to finished product 26mm.

[0039] In the hot rolling process, the slab is heated to 1150°C, the final rolling temperature is 880°C, and the coiling temperature is 580°C.

[0040] Implementation effect of the present invention

[0041] Finished product inspection Product quality: ...

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Abstract

The invention relates to a hot rolling process for producing electrical steel free of a metal flow stacking defect. Firstly, chemical components of the electrical steel are determined, and the electrical steel is cast into a plate blank, wherein the chemical components of the electrical steel specifically comprise 0.0025% or less of C, 0.38%-0.44% of Si, 0.24-0.35% of Mn, 0.06%-0.075% of P, less than 0.0072% of S, 0.003%-0.004% of Als, 0.003%-0.0042% of N and the balance Fe and unavoidable impurity elements. The hot rolling process has the characteristics that the quality of steel strips is improved, the steel strip hot rolling process is greatly facilitated, and the production percent of pass of steel strips is greatly improved by changing the hot rolling process.

Description

technical field [0001] The invention relates to the technical field of steelmaking hot rolling process, in particular to a hot rolling process for producing electrical steel without metal flow accumulation defects. Background technique [0002] When producing low-carbon mild steel hot-rolled steel strips in China, because the steel is soft and thin, it is easy to produce local accumulation defects of metal flow at the edge. Due to the quality characteristics of non-oriented electrical steel, the carbon content in the composition design is not more than 0.05%. The quality is very soft. In the production process, the local accumulation defects of the edge metal flow are important quality problems that affect the smooth production and user use, and have a great impact on the surface quality image of the steel plant and the yield rate of the user. When the degree is serious , may result in waste. According to statistics, 101 of the 162 hot-rolled steel strips produced by rollin...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/74C22C38/02C22C38/04C22C38/06C21D8/02
CPCB21B1/22B21B37/74B21B2001/225C21D8/0226C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06
Inventor 赵彦灵曹太平刘万善李波张保忠唐小勇丘祥光王晓飞张博睿唐辉罗石念张云虎
Owner NINGBO IRON & STEEL
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