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A method for reducing the Brinell hardness of crmo series hot-rolled bars

A bar and series technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of inability to adjust the production of different round steel, high transformation costs, and reduce the Brinell hardness of hot-rolled bars, so as to reduce production costs. , the effect of reducing energy consumption

Active Publication Date: 2018-12-14
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems that the existing technology needs to carry out the cooling control transformation of the production process, the transformation cost is high, and the production of different round steel cannot be adjusted, etc., this application provides a method for reducing the Brinell hardness of CrMo series hot-rolled bars, reducing The Brinell hardness of CrMo series hot-rolled bars needs to control the temperature of the heating section to be 1050-1120°C, control the temperature of the soaking section to be 1050-1110°C, and control the final rolling temperature of the rolling process to be 900-950°C

Method used

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  • A method for reducing the Brinell hardness of crmo series hot-rolled bars

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Embodiment 1

[0051] The specific embodiment part of the present invention provides a method for reducing the Brinell hardness of CrMo series hot-rolled bars, and the production process of CrMo series hot-rolled bars includes: heating, rolling, cooling, finishing and inspection processes; The heating process comprises: a preheating section, a heating section and a soaking section, specifically comprising the following steps:

[0052] (1) The billet enters the preheating section of the heating process, the state of the billet is a hot billet, and the temperature of the preheating section is 900°C; after preheating, the billet enters the heating section of the heating process, and the heating section The temperature is 1110°C; after leaving the heating section, the billet enters the soaking section of the heating process, and the temperature of the soaking section is 1110°C; when the billet is in a hot billet, the heating time of the heating process is 130 minutes;

[0053] (2) The steel bill...

Embodiment 2

[0058] The specific embodiment part of the present invention provides a method for reducing the Brinell hardness of CrMo series hot-rolled bars, and the production process of CrMo series hot-rolled bars includes: heating, rolling, cooling, finishing and inspection processes; The heating process comprises: a preheating section, a heating section and a soaking section, specifically comprising the following steps:

[0059] (1) The billet enters the preheating section of the heating process, the state of the billet is a cold billet, and the temperature of the preheating section is 850°C; after preheating, the billet enters the heating section of the heating process, and the heating section The temperature is 1050°C; after exiting the heating section, the billet enters the soaking section of the heating process, and the temperature of the soaking section is 1050°C; when the billet is in a hot billet state, the heating time of the heating process is 150 minutes;

[0060] (2) The ste...

Embodiment 3

[0065] The specific embodiment part of the present invention provides a method for reducing the Brinell hardness of CrMo series hot-rolled bars, and the production process of CrMo series hot-rolled bars includes: heating, rolling, cooling, finishing and inspection processes; The heating process includes: a preheating section, a heating section and a soaking section, specifically comprising the following steps:

[0066] (1) The billet enters the preheating section of the heating process, the state of the billet is a hot billet, and the temperature of the preheating section is 800 ° C; after preheating, the billet enters the heating section of the heating process, and the heating section The temperature is 1080°C; after leaving the heating section, the billet enters the soaking section of the heating process, and the temperature of the soaking section is 1080°C; when the billet is in a hot billet, the heating time of the heating process is 120 minutes;

[0067] (2) The steel bil...

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Abstract

The invention relates to a method for reducing Brinell hardness of a CrMo serial hot-rolled rod. A production process of the CrMo serial hot-rolled rod comprises a heating process and a rolling process; the heating process includes a heating section and a soaking section; and the reduction of the Brinell hardness of the CrMo serial hot-rolled rod needs to control the temperature of the heating section within 1050-1120 DEG C, to control the temperature of the soaking section within 1050-1110 DEG C and to control the final rolling temperature of the rolling process within 900-950 DEG C. The method can reduce the Brinell hardness of the CrMo serial hot-rolled rod from about 310 HBW to about 260 HBW; and compared with a controlled rolling and controlled cooling process, the method needs no controlled cooling process transformation for a production line, that is, 3-5 water cooling boxes and control equipment are added on the production line according to the process arrangement, so that the energy consumption can be reduced by 5-10%, the production cost is reduced, and CrMo steel with various specifications can be produced. Attention: the Brinell hardness of the rod is a Brinell hardness value in the 1 / 2 radius place of the cross section of the rod.

Description

technical field [0001] The invention belongs to the field of round steel thermal processing and relates to a method for reducing the Brinell hardness of CrMo series hot-rolled bars. Background technique [0002] Between 550~Ms℃, the transformation product of supercooled austenite is bainite structure, and this temperature zone is called bainite transformation zone. The transformation product formed by supercooled austenite between 550 and 350°C is called upper bainite structure (upper B). between slices. The transformation product formed by supercooled austenite between 350 and Ms°C is called lower bainite structure (below B), which is black needle-shaped under an optical microscope. The ferrite sheets in the upper bainite are wider and the plastic deformation force is lower. At the same time, the cementite is distributed between the ferrite sheets, which is easy to cause brittle fracture, so the strength and toughness are poor. [0003] At present, during the cooling pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D1/34C21D1/84C21D9/00C21D6/00
CPCC21D1/34C21D1/84C21D6/002C21D8/065C21D9/0075
Inventor 刘健刘广明史飞郭闯冯晓明张国东
Owner CHENGDE JIANLONG SPECIAL STEEL