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Preparation method of high carbon steel with good cold mouldability

A high-carbon steel technology with good cold formability, applied in the field of hot-rolled strip steel, can solve the problems of low spheroidization rate, many annealing times, and poor cold forming performance, so as to improve the yield and performance of the product, and prepare The effect of short process flow and good cold forming performance

Active Publication Date: 2015-01-14
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing high-carbon steel with good cold formability, so as to overcome the existence of coarse pearlite sheets and The amount of ferrite in the steel is low, which leads to the source of cracks in the shearing process and cracks in the cold bending process; after annealing heat treatment, the coarse pearlite sheets in the original structure of high carbon steel lead to cracks after annealing The spheroidization rate is very low (generally it can only reach 40-50%), the cold forming performance is poor, the number of times of annealing is required, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The production of 4.0mm steel strip, the main process flow: hot metal desulfurization→converter blowing→argon blowing→LF furnace refining→continuous casting→soaking furnace→finish rolling→laminar cooling→coiling→slow cooling in coil storage→levelling→ annealing;

[0021] The chemical composition of high carbon steel is designed as: C: 0.70%, Si: 0.38%, Mn: 1.20%, P: 0.010%, S: 0.003%, N: 0.005%, Cr: 0.10%, Als: 0.030, Ti: 0.002%, the rest is Fe and unavoidable impurities;

[0022] The main process parameters are:

[0023] The continuous casting steel temperature is 1500°C, the thickness of the continuous casting slab is 90mm, the temperature of the continuous casting slab is 900°C, the temperature of the furnace is 1130°C, the time of the casting slab in the furnace is 25min, the air-fuel ratio in the furnace is 1.30, the final rolling temperature is 880°C, and the finish rolling The reduction rate in the non-recrystallization zone is 15%, the laminar flow cooling ado...

Embodiment 2

[0026] The production of 2.0mm steel strip, the main process flow: hot metal desulfurization→converter blowing→argon blowing→LF furnace refining→continuous casting→soaking furnace→finish rolling→laminar cooling→coiling→slow cooling in coil warehouse→leveling→ annealing;

[0027] The chemical composition of high carbon steel is designed as: C: 0.50%, Si: 0.15%, Mn: 0.90%, P: 0.012%, S: 0.001%, N: 0.004%, Cr: 0.50%, Als: 0.030, Ti: 0.003%, the rest is Fe and unavoidable impurities;

[0028] The continuous casting temperature is 1520°C, the thickness of the continuous casting slab is 52mm, the temperature of the continuous casting slab is 920°C, the temperature of the furnace is 1280°C, the time of the casting slab in the furnace is 20min, the air-fuel ratio in the furnace is 1.10, the final rolling temperature is 860°C, and the finish rolling temperature is 860°C. The reduction rate in the non-recrystallized zone is 30%, the laminar flow cooling adopts the front stage of rapid ...

Embodiment 3

[0031] The production of 1.5mm steel strip, the main process flow: hot metal desulfurization → converter blowing → argon blowing → LF furnace refining → continuous casting → soaking furnace → finishing rolling → laminar cooling → coiling → slow cooling in coil storage → leveling → annealing;

[0032] The chemical composition of high carbon steel is designed as: C: 0.36%, Si: 0.10%, Mn: 0.60%, P: 0.012%, S: 0.001%, N: 0.004%, Cr: 0.90%, Als: 0.030, Ti: 0.003%, the rest is Fe and unavoidable impurities;

[0033] The temperature of continuous casting steel is 1535°C, the thickness of continuous casting slab is 50mm, the temperature of continuous casting slab entering the furnace is 920°C, the temperature of exiting the furnace is 1250°C, the time of casting slab in furnace is 30min, the air-fuel ratio in the furnace is 1.10, the final rolling temperature is 820°C, and the finishing rolling The reduction rate in the non-recrystallized area is 35%, the laminar flow cooling adopts ...

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Abstract

The invention discloses a preparation method of high carbon steel with good cold mouldability. The preparation method sequentially comprises the following steps: molten iron desulphurization; bessemerizing; argon blowing; refining; continuous casting; soaking pit; finish rolling; laminar cooling; taking up; slow cooling of a coil yard; leveling; and annealing. By means of controlling the chemical components of a steel product as well as a hot rolling process, a laminar cooling process, a take-up temperature and annealing process and the like, fine and dispersed globular pearlites are formed in steel, wherein the rate of spheroidization of pearlites is greater than or equal to 60%, the pearlites with the diameter which is greater than or equal to 2 mu m are greater than or equal to 60%, the tensile strength is 400-800MPa, the ductility is greater than or equal to 25% and the hardness is 130-290 HV. The preparation method disclosed by the invention not only is short in process flow, but also the prepared high carbon steel plate material is good in cold mouldability. In the moulding processes of cold punching, cold bending and the like, the material is not cracking, so that the yield and the usability of the material are greatly improved.

Description

technical field [0001] The invention relates to a method for preparing a high-carbon steel plate with good cold formability, belonging to the application field of hot-rolled strip steel. Background technique [0002] High carbon steel has good hardenability, wear resistance, high strength, etc., and is widely used in hardware products, auto parts manufacturing and other industries. Since the hot-rolled high-carbon steel sheet has thick pearlite sheets, high strength and poor plasticity, it is generally difficult to form directly. Improve the cold formability of the material. The spheroidization effect of the steel structure has a direct impact on the cold formability of the material. The main factors affecting the spheroidizing effect of high carbon steel include the original structure of hot-rolled steel and the spheroidizing annealing process. In the existing production process, the spheroidization rate in steel is usually increased by increasing the number of annealing...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C38/18C22C38/14C22C38/06C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/14C22C38/18
Inventor 谭文韩斌蔡珍魏兵
Owner 武汉钢铁有限公司
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