Method for controlling non-quenched and tempered high-intensity screw bolt steel high Bauschinger effect

A technology of Bauschinger effect and high-strength bolts is applied in the field of deep processing and drawing technology control, which can solve the problems of easy cracking of heading heads and high loss of grinding tools of heading heads

Inactive Publication Date: 2017-06-13
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for controlling the high Bauschinger effect of ferrite-pearlite type non-quenched and tempered high-strength bolt steel, which solves the problem of ferrite-pearlite type non-quenched and tempered high-strength bolt steel processing process For problems such as high loss of heading abrasives and easy cracking of headings, it is suitable for the control of low work hardening of cold-strengthened non-quenched and tempered steel headings. The specific process steps and technical parameters for control are:

Method used

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  • Method for controlling non-quenched and tempered high-intensity screw bolt steel high Bauschinger effect
  • Method for controlling non-quenched and tempered high-intensity screw bolt steel high Bauschinger effect
  • Method for controlling non-quenched and tempered high-intensity screw bolt steel high Bauschinger effect

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Embodiment 1

[0020] The present invention is at a height of 160mm 2 It has been applied in the production of Φ6.5mm wire rod, and non-quenched and tempered steel with excellent performance has been obtained.

[0021] 1 Stelmo air-cooling control, cover the insulation cover 5-22#, control the slow cooling cooling rate 1°C / s, and obtain the ferrite content in the tissue to be 50-55%;

[0022] 2. The hot-rolled wire rod is processed and drawn by the user The area reduction rate of a single drawing pass is controlled at 25%.

[0023] Table 1 shows the mechanical properties of ￠6.5mm ferrite-pearlite type steel hot-rolled wire rod and the properties of steel wire after drawing.

[0024]

Embodiment 2

[0026] The present invention is used in the 160mm high line of Shougang 2 It has been applied in the production of Φ6.5mm wire rod, and non-quenched and tempered steel with excellent performance has been obtained.

[0027] 1 Stelmo air-cooling control, cover with insulation cover 5-18#, control the slow cooling rate of 3°C / s, and obtain a ferrite content of 45-50%;

[0028] 2. The hot-rolled material is processed and drawn by the user The area reduction rate of a single drawing pass is controlled at 20%.

[0029] Table 1 shows the mechanical properties of φ6.5mm ferrite-pearlite type steel hot-rolled wire rod and steel wire properties after drawing.

[0030]

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Abstract

The invention relates to a method for controlling the non-quenched and tempered high-intensity screw bolt steel high Bauschinger effect, and belongs to the field of control of a deep processing drawing technology. The method comprises the following process steps and control technical parameters that the Stelmor air cooling control is used; a heat insulation cover is used for covering; the cooling speed after the cooling is controlled to be 1 to 3 DEG C / s; the obtained ferrite content is 45 to 55 percent; a ferrite-pearlite type hot rolling material is subjected to deep processing drawing treatment to realize instant cooling and reinforcement; the drawing area reducing rate is controlled to be 20 to 25 percent. The method has the advantages that the cold drawing area reducing rate and the steel ferrite ratio of the ferrite-pearlite type non-quenched and tempered high-intensity screw bolt are controlled to obtain the optimal positive dislocation density inside tissues; the high Bauschinger effect value is obtained.

Description

technical field [0001] The invention belongs to the field of deep processing and drawing technology control, and in particular provides a control method for controlling the high Bauschinger effect of ferrite-pearlite type non-quenched and tempered high-strength bolt steel, which is used for high-line control and production control of non-quenched and tempered steel User process control technology. Background technique [0002] With the rapid development of society, in order to meet the sustainable development in the future, steel with low energy consumption, low pollution and high performance has become the direction of development. The deep processing industry is gradually developing towards the direction of high efficiency, low cost and reduction of processing process, which makes the development of new materials suitable for new processes imminent. [0003] Domestic traditional high-strength (grade 8.8 and above) bolts are all quenched and tempered (quenched + tempered) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
CPCC21D8/005C21D2211/005C21D2211/009
Inventor 罗志俊李舒笳孙齐松王晓晨马跃王猛徐士新
Owner SHOUGANG CORPORATION
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