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A thermal processing process of 51crv4 hypoeutectoid fine blanking steel

A 51crv4, hypoeutectoid technology, used in the field of material processing, can solve the problems of low cementite spheroidization rate and complex processing technology, and achieve high cementite spheroidization rate, improve the uniformity of the structure, and simplify the production process. Effect

Active Publication Date: 2020-12-08
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of the existing 51CrV4 hypoeutectoid fine-blanking steel production process, the present invention provides a 51CrV4 hypo-eutectoid fine-blanking steel thermal processing process, which solves the complex processing technology of 51CrV4 hypo-eutectoid fine-blanking steel in the prior art, and the carburizing Technical problem with low spheroidization rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The 51CrV4 hypoeutectoid fine blanking steel contains C: 0.51%, Si: 0.25%, Mn: 0.88%, P: 0.015%, S: 0.015%, Cr: 1.00%, V: 0.16 in terms of mass percentage %, Al: 0.03%, N: 0.005%, and the balance is Fe and unavoidable impurities.

[0021] 51CrV4 hypoeutectoid fine blanking steel thermal processing steps are:

[0022] (1) Homogenization heat treatment: heat the 51CrV4 steel to 1000°C with the furnace, and keep it warm for 60 minutes;

[0023] (2) Recrystallization type controlled rolling: start rolling at 950°C, carry out 4 passes of rolling, the total deformation rate is 75%, and then rapidly cool to 750°C at a cooling rate of 20°C / s;

[0024] (3) Secondary low-temperature rolling: after the recrystallization type controlled rolling, 5 passes of rolling are carried out at the cooling temperature in step (2), and the total deformation rate is 70%;

[0025] (4) Tissue regulation and heat treatment: put the rolled steel plate into the heating furnace for 60 minutes, and ...

Embodiment 2

[0030] The 51CrV4 hypoeutectoid fine blanking steel contains C: 0.45%, Si: 0.3%, Mn: 0.93%, P: 0.01%, S: 0.015%, Cr: 1.16%, V: 0.17 in terms of mass percentage %, Al: 0.025%, N: 0.005%, and the balance is Fe and unavoidable impurities.

[0031] 51CrV4 hypoeutectoid fine blanking steel thermal processing steps are:

[0032] (1) Homogenization heat treatment: heat 51CrV4 steel with the furnace to 1050 ° C for 60 minutes;

[0033] (2) Recrystallization type controlled rolling: start rolling at 920°C, carry out 4 passes of rolling, the total deformation rate is 70%, and then rapidly cool to 750°C at a cooling rate of 40°C / s;

[0034](3) Secondary low-temperature rolling: after the recrystallization controlled rolling, 5 passes of rolling are carried out at the cooling temperature in step (2), and the total deformation rate is 85%;

[0035] (4) Tissue regulation and heat treatment: put the rolled steel plate into the heating furnace for 50 minutes, and the holding temperature is ...

Embodiment 3

[0040] The 51CrV4 hypoeutectoid fine blanking steel contains C: 0.53%, Si: 0.3%, Mn: 0.88%, P: 0.015%, S: 0.012%, Cr: 1.17%, V: 0.16% in terms of mass percentage %, Al: 0.03%, N: 0.002%, and the balance is Fe and unavoidable impurities.

[0041] The method steps of 51CrV4 hypoeutectoid fine blanking steel thermal processing process are:

[0042] (1) Homogenization heat treatment: heat the 51CrV4 steel to 1050°C for 40min with the furnace;

[0043] (2) Recrystallization type controlled rolling: start rolling at 960°C, carry out 4 passes of rolling, the total deformation rate is 60%, and then rapidly cool to 700°C at a cooling rate of 30°C / s;

[0044] (3) Secondary low-temperature rolling: after the recrystallization type controlled rolling, carry out 5 passes of rolling at the cooling temperature in step (2), and the total deformation rate is 75%;

[0045] (4) Tissue regulation and heat treatment: put the rolled steel plate into the heating furnace for 40min, and the holding ...

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Abstract

A thermal processing technology for 51CrV4 hypoeutectoid fine blanking steel, belonging to the field of material processing technology. It includes the following steps: (1) homogenization heat treatment; (2) recrystallization controlled rolling; (3) secondary low-temperature rolling; (4) structure control heat treatment; (5) cementite control heat treatment; (6) ball chemical heat treatment. The processed 51CrV4 hypoeutectoid fine-blanking steel has a high cementite spheroidization rate in the microstructure, and the spherical cementite particles are evenly, finely and dispersedly distributed on the ferrite matrix, and the obtained fine-blanking steel properties It is good, and the ferrite structure is evenly distributed in small pieces in the structure. The present invention can realize the integration of hot rolling and cementite spheroidizing treatment, and uses the waste heat after hot rolling to perform spheroidizing heat treatment, saving energy and reducing costs, and Compared with the traditional hot rolling-cold rolling-spheroidizing annealing production process of fine blanking steel, the production process is simplified, time is saved, and the quality of cementite spheroidization is improved.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a thermal processing process of 51CrV4 hypoeutectoid fine blanking steel. Background technique [0002] 51CrV4 is a hypoeutectoid fine-blanking steel and a typical medium-carbon low-alloy steel with good hardenability. Its fine blanking parts require smooth blanking surface, high dimensional accuracy and high flatness. The organization of the steel is the key to fulfilling these requirements. At present, fine blanking steel is generally produced by hot rolling-cold rolling-spheroidizing annealing process to obtain a structure in which fine spherical cementite is dispersed and evenly distributed on the ferrite matrix. However, Cr and V elements are strong carbide-forming elements, and the formed carbides have a high melting point and are not easy to dissolve. When the lamellar cementite dissolves, it will hinder the grain boundary migration and slow down ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D1/32C22C38/02C22C38/04C22C38/06C22C38/24
CPCC21D1/32C21D8/0226C21D2211/003C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/24
Inventor 齐敏吴红艳杜林秀杨莹莹董营刘悦
Owner NORTHEASTERN UNIV LIAONING