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Method for improving surface quality of silicon-containing steel

A technology of surface quality and silicon steel, applied in the field of silicon-containing steel, can solve problems such as difficult maintenance, increased water pressure, and high water consumption, and achieve the effects of high applicability, easy operation and control, and reduced cost investment

Active Publication Date: 2017-02-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method generally optimizes and transforms the high-pressure water phosphorus removal system. It needs to lay special pipelines to connect the water source and the phosphorus removal tank, and even increase the water pressure, which consumes a lot of water, requires a large investment, and is not easy to maintain.

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  • Method for improving surface quality of silicon-containing steel
  • Method for improving surface quality of silicon-containing steel
  • Method for improving surface quality of silicon-containing steel

Examples

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Embodiment 1

[0018] A method for improving the surface quality of silicon-containing steel. Heat the silicon-containing steel at a heating rate of 23-24 °C / min to 500-700 °C, then at a heating rate of 3-5 °C / min to 1180-1230 °C, keep it warm for 30-40 min, and then air-cool to room temperature.

[0019] The chemical composition and content of the silicon-containing steel are: C is 0.070~0.081wt%, Si is 1.20~1.42wt%, Mn is 1.10~1.53wt%, Cr is 0.010~0.015wt%, P≤0.011wt%, S≤0.003wt%, Ni≤0.007wt%, and the rest are Fe and unavoidable impurities.

[0020] figure 1 It is a backscattered electron image of the oxide scale cross-section of the product obtained by a method for improving the surface quality of silicon-containing steel in this embodiment; image 3 Produced for existing staged heating processes with figure 1 The backscattered electron image of the cross-section of the oxide scale of the same grade of silicon-containing steel shown.

[0021] From figure 1 Learn that: the Fe between ...

Embodiment 2

[0023] A method for improving the surface quality of silicon-containing steel. Heat the silicon-containing steel at a heating rate of 24-25 °C / min to 600-800 °C, then at a heating rate of 4-6 °C / min to 1220-1260 °C, keep it warm for 20-30 min, and then air-cool to room temperature.

[0024] The chemical composition and content of the silicon-containing steel are: C is 0.075~0.084wt%, Si is 1.40~1.60wt%, Mn is 1.42~1.94wt%, Cr is 0.014~0.020wt%, P≤0.016wt%, S≤0.005wt%, Ni≤0.008wt%, and the rest are Fe and unavoidable impurities.

[0025] figure 2 It is a backscattered electron image of the oxide scale cross-section of the product obtained by a method for improving the surface quality of silicon-containing steel in this embodiment; Figure 4 Produced for existing staged heating processes with figure 2 The backscattered electron image of the cross-section of the oxide scale of the same grade of silicon-containing steel shown.

[0026] From figure 2 Learn that: the Fe betw...

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Abstract

The invention particularly relates a method for improving the surface quality of silicon-containing steel. According to the technical scheme, the method is characterized in that the silicon-containing steel is heated to the temperature of 500 DEG C-800 DEG C at the heating rate of 23 DEG C / min-25 DEG C / min and then heated to the temperature of 1,180 DEG C-1,260 DEG C at the heating rate of 3 DEG C / min-6 DEG C / min, the temperature is kept for 20 minutes to 40 minutes, and then air cooling is performed to the room temperature. The silicon-containing steel comprises 0.070-0.084 wt% of C, 1.20-1.60 wt% of Si, 1.10-1.94 wt% of Mn, 0.010-0.020 wt% of Cr, not larger than 0.016 wt% of P, not larger than 0.005 wt% of S, not larger than 0.008 wt% of Ni and the balance Fe and inevitable impurities. The method has the beneficial effects of being simple in process, suitable for industrial production and capable of effectively reducing red scale and effectively improving the surface quality of the silicon-containing steel.

Description

technical field [0001] The invention belongs to the technical field of silicon-containing steel. Specifically relates to a method for improving the surface quality of silicon-containing steel. [0002] technical background [0003] When silicon-containing steel is heated in a heating furnace, Si reacts with O and Fe to form a layer of ferrous silicate (Fe 2 SiO 4 ). The temperature is higher than 1177°C (FeO / Fe 2 SiO 4 eutectic point), Fe 2 SiO 4 It melts and penetrates into the FeO grain boundary, solidifies and pins FeO after it comes out of the furnace, making it difficult to completely remove it when descaling with high-pressure water, and is subsequently oxidized into Fe 2 o 3 , and eventually red oxide scale defects will be formed on the surface of the steel plate. Fe formed during heating 2 SiO 4 Defects that reduce descaling ability and eventually cause red scale are well recognized, but how does the heating process affect the silicon-containing steel Fe 2...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/04C22C38/02C22C38/58C22C38/40C22C38/18C22C38/34C21D6/00
CPCC21D6/008C22C38/02C22C38/04C22C38/18C22C38/34C22C38/38C22C38/40C22C38/58
Inventor 徐光袁清何贝周明星胡海江田俊羽梁伟成侯蓉
Owner WUHAN UNIV OF SCI & TECH
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