A kind of delayed fracture resistant alloy cold heading steel wire rod and its production method

A technology of resistance to delayed fracture and cold heading steel, applied in the field of alloy cold heading steel wire rod and its production, can solve the problems of total decarburization of surface structure, high requirements for delayed fracture ability and low quality, and achieve good delayed fracture resistance. , the effect of improving the service life and safety factor

Active Publication Date: 2020-07-17
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the rolling process of high-strength cold heading steel wire rods such as 42CrMo, it is easy to have the defect of complete decarburization of the surface structure, and the steel has high requirements for delayed fracture ability.
However, the composition of the wire rod is not pure, and it is produced by billet, the quality is low

Method used

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  • A kind of delayed fracture resistant alloy cold heading steel wire rod and its production method
  • A kind of delayed fracture resistant alloy cold heading steel wire rod and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]In this example, the chemical composition of carbon-chromium-molybdenum cold-heading steel is designed according to the technical solution of the present invention. After smelting, it is cast into a bloom with a cross-sectional size of 280×380mm, and the degree of superheat is 26°C; the current intensity of electromagnetic stirring in the mold is 400A. A 280×380mm bloom is heated and rolled into a billet with a cross-sectional size of 155×155mm, and the surface defects of the billet are ground.

[0040] Billets are rolled on a high speed wire rod mill Wire rod, the rolling process is as follows:

[0041] 1) The furnace temperature of the first stage of the heating furnace is 900°C; the temperature of the second stage is 1100°C; the upper soaking section is 1050°C; the lower soaking section is 1020°C, and the air-fuel ratio is 2.3;

[0042] 2) Control the starting rolling temperature to 960°C, the finish rolling inlet temperature to 910°C, the sizing inlet temperature t...

Embodiment 2

[0045] In this example, the chemical composition of medium-carbon chromium-molybdenum cold heading steel is designed according to the technical solution of the present invention. After smelting, it is poured into a bloom with a cross-sectional size of 280×380mm. The degree of superheat is 25°C. 400A, heating and rolling a 280×380mm bloom into a billet with a cross-section of 155×155mm, and grinding the surface defects of the billet.

[0046] Billets are rolled on a high speed wire rod mill Wire rod, the rolling process is as follows:

[0047] 1) The first-stage furnace temperature of the heating furnace is 910°C; the second-stage furnace temperature is 1120°C; the upper soaking section is 1040°C; the lower soaking section is 1020°C, and the air-fuel ratio is 2.4;

[0048] 2) Control the starting rolling temperature to 970°C, the finish rolling inlet temperature to 920°C, the sizing inlet temperature to 900°C, and the spinning temperature to 850°C;

[0049] 3) Stelmore air-c...

Embodiment 3

[0051] In this example, the chemical composition of the medium-carbon chromium-molybdenum cold heading steel is designed according to the technical solution of the present invention. After smelting, it is poured into a bloom with a section size of 280×380mm. The degree of superheat is 24°C. 400A, heating and rolling a 280×380mm bloom into a billet with a cross-section of 155×155mm, and grinding the surface defects of the billet.

[0052] Billets are rolled on a high speed wire rod mill Wire rod, the rolling process is as follows:

[0053] 1) The first-stage furnace temperature of the heating furnace is 890°C; the second-stage furnace temperature is 1090°C; the upper soaking section is 1045°C; the lower soaking section is 1025°C, and the air-fuel ratio is 2.5;

[0054] 2) Control the starting rolling temperature to 955°C, the finish rolling inlet temperature to 915°C, the sizing inlet temperature to 895°C, and the spinning temperature to 855°C;

[0055] 3) Stelmore air-coole...

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Abstract

The invention relates to a delay-fracture-resistant alloy cold-upset steel coil strip and a production method thereof. The alloy cold-upset steel coil strip comprises the following chemical componentsof, by weight, 0.37 %-0.41 % of C, 0.15 %-0.30 % of Si, 0.75 %-0.95 % of Mn, 0.90 %-1.20 % of Cr, 0.15 %-0.30 % of Mo, 0.05 %-0.15 % of W, V or Nb, wherein 0.030 %-0.060 % of V, 0.010 %-0.030 % of Nb, the balance Fe and inevitable impurities. According to the alloy cold-upset steel coil strip and the production method, through reasonable design of chemical components, production processes of continuous casting continuous rolling, heating, rolling control and cold control are adopted, a ferrite and pearlite structure is produced, a medium-carbon chromium-molybdenum alloy cold-upsetting steel coil strip without a full-decarburized layer, and the alloy cold-upset steel coil strip has good delay fracture resistance.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an alloy cold heading steel wire rod resistant to delayed fracture and a production method thereof. Background technique [0002] 42CrMo and other high-strength cold heading steels are mainly used to produce 12.9 grade high-strength fasteners. In recent years, with the rapid development of the domestic automobile industry, the demand for high-strength cold heading steel has increased year by year. There are many steel companies producing wire rods for fasteners in my country, but the quality of the products produced is uneven, and most of them are low-end products. Foreign imported materials have many advantages such as good hardenability, high purity and stable assembly. Therefore, The high-level fastener market has long been occupied by foreign products. [0003] During the rolling process of high-strength cold heading steel wire rods such as 42CrMo, the defe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C21D8/06
CPCC21D8/065C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26
Inventor 马立国郭大勇王秉喜孙振宇李凯杨辉张博高航袁野王宏亮
Owner ANGANG STEEL CO LTD
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