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A kind of preparation method of non-quenched and tempered steel with high strength and surface quality

A non-quenched and tempered steel, surface quality technology, applied in the field of metallurgy, can solve problems such as thermal processing performance reduction, lower interfacial tension, cracks, etc., to achieve the effect of promoting core deformation, improving surface roughness, and uniform composition

Inactive Publication Date: 2020-12-15
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In traditional free-cutting non-quenched and tempered steel, the content of S element is large, which will reduce the interfacial tension, reduce the hot workability, and easily slip and crack

Method used

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  • A kind of preparation method of non-quenched and tempered steel with high strength and surface quality
  • A kind of preparation method of non-quenched and tempered steel with high strength and surface quality
  • A kind of preparation method of non-quenched and tempered steel with high strength and surface quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Non-quenched and tempered steel 1# is rolled by the method proposed by the present invention, the thickness of the slab is 80mm, and the blank (C: 0.20%, Mn: 2.00%, Si: 0.35%, Cr: 0.50%, Ni: 0.06%, V : 0.12%, Nb: 0.05%, Ti: 0.013%, Ce: 0.010%, and the balance is Fe and unavoidable impurities.) Put it into a heating furnace and heat it to 1200°C, and after holding for 3 hours, dephosphorize and roll. The rolling start temperature in the recrystallization zone is 1125°C, and the final rolling temperature is 956°C. The rolling is carried out in three passes, and the reduction rates are 25%, 30%, and 35% respectively. The rolling start temperature in the non-recrystallized area is 859°C and the final rolling temperature is 840°C. Rolling is carried out in two passes, and the reduction rates are 40% and 30% respectively. Roll into a 10mm steel plate, enter the ultra-rapid cooling device for cooling to 654°C, and then air-cool to room temperature.

Embodiment 2

[0039] Non-quenched and tempered steel 2# is rolled by the method proposed by the present invention, the thickness of the slab is 80mm, and the blank (C: 0.20%, Mn: 2.00%, Si: 0.35%, Cr: 0.50%, Ni: 0.06%, V : 0.12%, Nb: 0.05%, Ti: 0.013%, Ce: 0.010%, and the balance is Fe and unavoidable impurities.) Put it into a heating furnace and heat it to 1200°C, and after holding for 3 hours, dephosphorize and roll. The rolling start temperature in the recrystallization zone is 1128°C, and the final rolling temperature is 964°C. The rolling is carried out in three passes, and the reduction ratios are 25%, 30%, and 35% respectively. The rolling start temperature in the non-recrystallization area is 852°C and the final rolling temperature is 841°C. Rolling is carried out in two passes, and the reduction rates are 40% and 30% respectively. Roll into a 10mm steel plate, enter the ultra-rapid cooling device for cooling to 546°C, and then air-cool to room temperature.

Embodiment 3

[0041] Non-quenched and tempered steel 3# is rolled by the method proposed by the present invention, the slab thickness is 80mm, and the blank (C: 0.20%, Mn: 2.00%, Si: 0.35%, Cr: 0.50%, Ni: 0.06%, V : 0.12%, Nb: 0.05%, Ti: 0.013%, Ce: 0.010%, and the balance is Fe and unavoidable impurities.) Put it into a heating furnace and heat it to 1200°C, and after holding for 3 hours, dephosphorize and roll. The rolling start temperature in the recrystallization zone is 1142°C, and the final rolling temperature is 964°C. The rolling is carried out in three passes, and the reduction rates are 25%, 30%, and 35% respectively. The rolling start temperature in the non-recrystallization area is 871°C and the final rolling temperature is 852°C. Rolling is carried out in two passes, and the reduction rates are 40% and 30% respectively. Roll into a 10mm steel plate, enter the ultra-rapid cooling device for cooling to 461°C, and then air-cool to room temperature.

[0042] The surface hardness t...

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Abstract

The invention relates to a method for preparing non-quenched and tempered steel with high strength and surface quality, and belongs to the field of metallurgy. A method for preparing non-quenched and tempered steel with high strength and surface quality, including the steps of holding and rolling. The rolling includes two stages of rolling in the recrystallization zone and the non-recrystallization zone, wherein the rolling in the recrystallization zone Steelmaking: opening rolling temperature is 1100~1150℃, final rolling temperature is 950~1000℃; rolling in non-recrystallization area: opening rolling temperature is 860~900℃, final rolling temperature is 800~840℃, after rolling the steel will be Cool to 450~650°C at a cooling rate of 30°C / s~50°C / s to undergo bainite transformation, then slowly cool to room temperature on the cooling bed. The method of the present invention greatly saves energy and production cycle, shortens the layout of the production line, streamlines later heat treatment furnaces and other equipment, reduces production costs, and reduces environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing non-quenched and tempered steel with high strength and surface quality, belonging to the field of metallurgy. Background technique [0002] With the rapid development of my country's automobile manufacturing industry, my country has maintained its position as the world's largest automobile production country since 2009 until ten years later. Although with the gradual saturation of the market, the growth rate from 2011 to 2018 has increased from a rapid increase to a slowdown. In 2018, the output of automobiles was 27.8 million. In 2019, it is predicted that the increase may even exceed 28 million. In a car, the engine plays the same role as the heart of the human body, and it is also the core of the whole car. The crankshaft is the most important part of the engine. It can connect the connecting rod under the working state of the engine to perform the turning movement. To convert torque output into power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02C21D1/20
CPCC21D1/20C21D8/0226C21D2211/002C21D2211/005C22C38/005C22C38/02C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 赵宪明杨洋董春宇韩怀宾赵晓宇
Owner NORTHEASTERN UNIV LIAONING