Method for making orientation-free cold-rolled electric steel-board

A technology for electrical steel sheet and manufacturing method, which is applied to manufacturing tools, other manufacturing equipment/tools, heat treatment process control, etc., can solve the problems of increasing the decarburization burden of continuous annealing furnaces, reducing continuous annealing units, and failing to achieve good results. , to avoid the deterioration of electromagnetic performance, reduce investment and reduce adverse effects

Inactive Publication Date: 2007-11-14
湖北方盛合力金属材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that if the original carbon content of the steel plate is too high, it will increase the decarburization burden of the continuous annealing furnace, thereby reducing the output of the continuous annealing unit, resulting in increased investment and production costs. In order to increase the output of the continuous annealing unit, all Use high-purity or even ultra-high-purity vacuum smelting to reduce the original carbon content in steel to 50--100ppm, or even below 30ppm, so that the continuous annealing unit mainly completes the task of recrystallization.
[0004] Enterprises that do not meet the above conditions have used bell-type furnaces to decarburize hot-rolled coil blanks by loose-coil black annealing to make up for the failure of high-purity vacuum smelting. Problems such as difficult operation and uneven decarbonization have also failed to achieve good results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. The raw material is smelted in an oxygen top-blown converter, and its chemical composition (%) is as follows:

[0017] C Mn S P SI

[0018] 0.06 0.23 0.018 0.021 2.12

[0019] 2. The specification of the raw material is 2.75×355mm hot-rolled coil, and the finished specification of the non-oriented cold-rolled electrical steel sheet to be produced is 0.51×350mm cold-rolled silicon steel strip.

[0020] 3. Manufacturing method: Pickling the hot-rolled silicon steel coil billets smelted in an oxygen top-blown converter, and then cold-rolling to a silicon steel strip with a thickness of 0.51mm. Finished annealing is carried out in a bell-type furnace, and a mixed gas of hydrogen and nitrogen is used as a protective gas in the bell-type furnace, of which hydrogen accounts for 10-50% and nitrogen accounts for 50-90%; the annealing process is 80°C-90°C / hour Raise the temperature to 700-720°C, keep it for 15-16 hours, and then cool slowly. The cooling rate is 15-20°C / hour ...

Embodiment 2

[0029] 1. Ingredients

[0030] The raw material is smelted in an oxygen top-blown converter, and its chemical composition (%) is as follows:

[0031] C Mn S P Si

[0032] 0.04 0.21 0.012 0.020 2.32

[0033] 2. Specifications of raw materials and finished products

[0034] The specification of the raw material is 2.70×355 hot-rolled coil, and the finished specification of the non-oriented cold-rolled electrical steel sheet to be produced is 0.49×350mm cold-rolled silicon steel strip.

[0035] 3. Manufacturing method

[0036] The hot-rolled silicon steel coil billets smelted in the oxygen top-blown converter are pickled, and then cold-rolled to a silicon steel strip with a thickness of 0.53 mm. The intermediate annealing is carried out in the bell furnace first, and the mixed gas of hydrogen and nitrogen is used as the protective gas in the bell furnace, of which hydrogen accounts for 10-50% and nitrogen accounts for 50-90%; the annealing process is 100°C-110°C / hour Raise t...

Embodiment 3

[0043] 1. Raw material composition, the raw material is smelted by oxygen top-blown converter, and its chemical composition is as follows:

[0044] C Mn S P SI

[0045] 0.08 0.18 0.21 0.019 2.35

[0046] 2. Specifications of raw materials and finished products

[0047] The specification of the raw material is 2.65×355mm hot-rolled coil, and the finished specification of the non-oriented cold-rolled electrical steel sheet to be produced is 0.50×350mm cold-rolled silicon steel strip.

[0048] 3. Manufacturing method

[0049]The hot-rolled silicon steel coil billet smelted in the oxygen top-blown converter is pickled, and then cold-rolled to a silicon steel strip with a thickness of 0.54mm. The intermediate annealing is carried out in the bell furnace first, and the mixed gas of hydrogen and nitrogen is used as the protective gas in the bell furnace, of which hydrogen accounts for 10-50% and nitrogen accounts for 50-90%; the annealing process is 90°C-100°C / hour Rapidly raise ...

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PUM

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Abstract

The invention relates to a preparation method of the non-oriented cold rolling electrotechnical steel plates. It provides convenience for small and medium-sized enterprises to produce the non-oriented cold rolling electrotechnical steel plates by using materials from normal smelting method without costly continuous annealing line. The preparation steps are as follows: it selects hot rolling silicon steel coils (whit C<800ppm) produced by normal smelting method for pickling and cold rolling. To complete final annealing in the bell furnace, heat the temperature to 700-880 C degree quickly and keep for 8-16h, cooling slowly and naturally below 80 C degree to convert. The invention adopts annealing technology of the bell furnace instead of vacuum smelting greatly reducing the C content to dissolves C into the steel during heating. There is no dissolved carbon in unstable state in the final steel plates, which avoid magnet aging or electromagnetic properties deterioration. The products have good performance and can save producing cost.

Description

technical field [0001] The invention relates to a method for manufacturing a non-oriented cold-rolled electrical steel sheet. Background technique [0002] Non-oriented electrical steel sheets are widely used in the fields of electrical appliances, automobiles and air conditioners due to their stable magnetic induction performance, good longitudinal thickness difference (±5μ), good coating insulation and punching performance, and strong corrosion resistance. The current manufacturing method for producing non-oriented electrical steel sheets is to first use vacuum-produced high-purity silicon steel in smelting, and then hot-roll into coils, pickling, cold-rolling, continuous decarburization and annealing until the finished product is inspected and shipped. [0003] Among them, continuous annealing is an important process in the production of cold-rolled non-oriented electrical steel sheets. The continuous annealing unit requires a large investment, accounting for a large prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/04C21D1/26C21D9/663C21D11/00
Inventor 方泽民孙绍宁马崇光王伟民方琳
Owner 湖北方盛合力金属材料有限公司
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