Method for quenching small-size No. 45 steel parts

A technology of small size and parts, applied in the field of steel quenching, can solve the problems of unsatisfactory actual effect, difficult operation difficulty, quenching cracking problem, etc., achieve the effect of small deformation, good hardness consistency, and reduce processing cost

Inactive Publication Date: 2011-05-11
XIAN AEROSPACE PRECISION ELECTROMECHANICAL INST
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  • Abstract
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  • Claims
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Problems solved by technology

However, some of these methods increase the processing steps (first rough turning) and energy consumption (increase annealing), and some increase the difficulty of operation and are difficult to control (such as water and oil double liquid quenching), etc., the actual effect is not very satisfactory, and the quenching cracks The problem still plagues the heat treatment team

Method used

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  • Method for quenching small-size No. 45 steel parts
  • Method for quenching small-size No. 45 steel parts
  • Method for quenching small-size No. 45 steel parts

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Embodiment Construction

[0021] see figure 2 , the present invention provides a quenching method for small-sized parts of 45# steel - sub-temperature quenching. The method includes the following steps: heating and heat preservation at 770-780°C, quenching in salt water, tempering at 500-540°C, especially tempering at 520°C (HRC28~32). See Table 1. The new method reduces one rough turning process and one annealing treatment method, saves energy and reduces consumption, and is easy to operate. It solves the problem of quenching cracking of cold-drawn 45# steel and achieves good results.

[0022] Table 1 Comparison of new and old processing methods for 45# steel

[0023]

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Abstract

The invention relates to a method for quenching No. 45 steel, comprising the following steps: 1) heating to 770-780 DEG C, and quenching with saline water at room temperature, wherein the concentration of the saline water is 5-10%; and 2) tempering at 500-540 DEG C. The method for quenching No. 45 steel has the characteristics of fewer processing procedures, energy conservation, low cost and less deformation, and is easy to operate.

Description

technical field [0001] The invention relates to a steel quenching method, in particular to a 45# steel quenching method. Background technique [0002] 45# steel is a high-quality carbon structural steel widely used at present. Since 45# steel has good comprehensive mechanical properties after quenching and tempering treatment, when making some key parts (with a size of Φ5~Φ12), the design drawings Most of them require the selection of cold-drawn 45 round steel for quenching and tempering (quenching + high temperature tempering) treatment. [0003] At present, the commonly used quenching method for 45# steel is to heat to 840-860°C for brine quenching and tempering at 540°C. During such quenching treatment, quenching and cracking of cold-drawn 45 round steel often occur, resulting in the scrapping of parts. Hundreds of small shafts with a size of Φ8 were scrapped after heat treatment due to quenching cracks, and hundreds of screws with a size of Φ6 were scrapped after heat t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/60
Inventor 石新泰
Owner XIAN AEROSPACE PRECISION ELECTROMECHANICAL INST
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