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Thermal control and cold control process of ultralow-carbon fiber steel

An ultra-low carbon and fiber technology, applied in the direction of metal rolling, can solve the problems that the ductility and drawability of the product cannot be guaranteed, the ferrite in the finished product cannot be fully formed, and the tensile strength of the product cannot be guaranteed, so as to achieve reduction Pearlite production, effects of high tensile strength, high ductility and drawability

Active Publication Date: 2014-07-30
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the heat control and cooling process of low-carbon fiber steel cannot improve the drawing performance of the product, and the ferrite in the finished product cannot be fully formed, and the fine soft-phase ferrite structure will not interact with the small amount of hard-phase pearlite produced in the later stage of cooling. Combination of tissues does not guarantee that the product has high ductility and drawability, nor does it guarantee that the product has high tensile strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The weight percentage components of ultra-low carbon fiber steel in this embodiment are: C: 0.03%, Mn: 0.25%, Si: 0.07%, P: 0.015%, S: 0.015%, Ni: 0.1%, Cr: 0.1 %, Mo: 0.02%, B: 0.006%, Cu: 0.1%, Fe: balance. The heat control and cooling process of ultra-low carbon fiber steel in this embodiment uses a walking heating furnace to heat the steel billet, and it is required to reach 1150°C in the soaking section and keep it warm for 35 minutes; the rolling speed is 100m / s , the starting rolling temperature is controlled at 1050°C, and the temperature control is not carried out in the subsequent rough rolling and pre-finishing rolling process, which belongs to the temperature free rolling process. After the pre-finishing rolling, the rolling temperature is controlled, that is, through water cooling. The method first reduces the temperature to 910°C and enters the finishing mill for rolling. After exiting the finishing mill, the temperature of the wire rod is controlled at 84...

Embodiment 2

[0011] The weight percentage components of ultra-low carbon fiber steel in this embodiment are: C: 0.05%, Mn: 0.30%, Si: 0.09%, P: 0.010%, S: 0.012%, Ni: 0.08%, Cr: 0.09 %, Mo: 0.015%, B: 0.009%, Cu: 0.08%, Fe: balance. The heat control and cooling process of ultra-low carbon fiber steel in this embodiment uses a walking heating furnace to heat the steel billet, and it is required to reach 1150°C in the soaking section and keep it warm for 40 minutes in the soaking section; the rolling speed is 100m / s , the starting rolling temperature is controlled at 1070°C, and the temperature control is not carried out in the subsequent rough rolling and pre-finishing rolling process, which belongs to the temperature free rolling process. After the pre-finishing rolling, the rolling temperature is controlled, that is, through water cooling The method first reduces the temperature to 910°C and enters the finishing mill for rolling. After exiting the finishing mill, the temperature of the wi...

Embodiment 3

[0013] The weight percentage components of ultra-low carbon fiber steel in this embodiment are: C: 0.06%, Mn: 0.35%, Si: 0.11%, P: 0.012%, S: 0.011%, Ni: 0.06%, Cr: 0.07 %, Mo: 0.01%, B: 0.011%, Cu: 0.06%, Fe: balance. The heat control and cooling process of ultra-low carbon fiber steel in this embodiment uses a walking heating furnace to heat the steel billet. It is required to reach 1150 ° C in the soaking section and keep it warm for 45 minutes in the soaking section; the rolling speed is 100m / s , the starting rolling temperature is controlled at 1090°C, and the temperature control is not carried out in the subsequent rough rolling and pre-finishing rolling process, which belongs to the temperature free rolling process. After the pre-finishing rolling, the rolling temperature is controlled, that is, through water cooling The method first reduces the temperature to 910°C and enters the finishing mill for rolling. After leaving the finishing mill, the temperature of the wire ...

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Abstract

The invention belongs to a heat-controlling-cooling process in the field of steel rolling, and is a heat-controlling-cooling process for ultra-low carbon fiber steel. The hot section is kept warm for a certain period of time; the rolling start temperature is controlled at 1070±20°C, and the rolling temperature is controlled after the pre-finishing rolling is completed, that is, the temperature is lowered to 910°C by water cooling, and the rolling is carried out in the finishing mill. After the finish rolling mill, the temperature of the wire rod is controlled at 850±10°C, and after the final rolling, the temperature of the wire rod is reduced to 880±10°C through a temperature control process, and finally enters spinning and forming; the final cover temperature is guaranteed to be ≤400°C, and the final coil is collected . The invention can improve the drawing performance of the product, ensure that the product has high ductility and drawing performance, and at the same time make the product have higher tensile strength.

Description

technical field [0001] The invention belongs to a heat-controlling-cooling process in the field of steel rolling, in particular to a heat-controlling-cooling process of ultra-low carbon fiber steel. Background technique [0002] Fiber steel is mainly used to build buildings that can resist large deformation. When concrete is poured, it is added to the concrete to improve the comprehensive seismic and impact resistance of concrete. Therefore, fiber steel should have high ductility, good drawing performance, certain corrosion resistance, high shrinkage after breaking, and be able to withstand large deformation and high tensile strength. In the prior art, the heat control and cooling process of low-carbon fiber steel cannot improve the drawing performance of the product, and the ferrite in the finished product cannot be fully formed, and the fine soft-phase ferrite structure will not interact with the small amount of hard-phase pearlite produced in the later stage of cooling. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C22C38/04B21B1/16
Inventor 刘宇徐晓春杨兆根张建峰杨静孙军朱峰宋立媛
Owner NANJING IRON & STEEL CO LTD
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