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Heat treatment process for raising comprehensive performace of low alloy structure steel

A comprehensive performance and structural steel technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problem that the mechanical properties cannot meet the requirements of mechanical parts, and achieve the effect of improving mechanical properties and yield strength

Active Publication Date: 2008-07-23
BPW (MEIZHO) AXLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a low-alloy structural steel that can significantly improve the mechanical performance of the low-alloy structural steel produced at the existing domestic technical level, whose mechanical properties cannot meet the shortage of mechanical parts that are used to manufacture high-strength and high-fatigue service life. Q345 comprehensive performance, a heat treatment process for improving the comprehensive performance of low-alloy structural steel used in the production of axle beam tubes and other important parts of trailers, trucks, construction machinery, mining machinery and other vehicles

Method used

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  • Heat treatment process for raising comprehensive performace of low alloy structure steel
  • Heat treatment process for raising comprehensive performace of low alloy structure steel
  • Heat treatment process for raising comprehensive performace of low alloy structure steel

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1. Material: low alloy structural steel Q345 pipe

[0020] 2. Heat treatment process: (1) Quenching: After the empty furnace is preheated to 860°C and stabilized for 40 minutes, put the low-alloy structural steel into the furnace, heat it to 860°C and keep it for 40 minutes, and immediately cool it to room temperature; (2) Tempering: After the furnace temperature is preheated to 580°C, put the quenched low-alloy structural steel into the furnace and heat it to 580°C. After holding for 50 minutes, take it out and cool it in the air. The time interval between quenching and tempering should not exceed 60 minutes. The performance test data are shown in Table 3.

Embodiment 2

[0022] 1. Material: low alloy structural steel Q345 pipe

[0023] 2. Heat treatment process: (1) Quenching: After the empty furnace is preheated to 880°C and stabilized for 40 minutes, put the low-alloy structural steel into the furnace, heat it to 880°C, keep it for 40 minutes, and immediately cool it to room temperature; (2) Tempering: After the furnace temperature is preheated to 570°C, put the quenched low-alloy structural steel into the furnace and heat it to 570°C. After holding for 50 minutes, take it out and cool it in the air. The time interval between quenching and tempering should not exceed 60 minutes. The performance test data are shown in Table 3.

Embodiment 3

[0025] 1. Material: low alloy structural steel Q345 pipe

[0026] 2. Heat treatment process: (1) Quenching: After the empty furnace is preheated to 900°C and stabilized for 40 minutes, put the low-alloy structural steel into the furnace, heat it to 900°C, keep it for 40 minutes, and immediately cool it to room temperature; (2) Tempering: After the furnace temperature is preheated to 620°C, put the quenched low-alloy structural steel into the furnace and heat it to 620°C. After holding for 50 minutes, take it out and cool it in the air. The time interval between quenching and tempering should not exceed 60 minutes. The performance test data are shown in Table 3.

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Abstract

The heat treatment process for raising comprehensive performance of low alloy structure steel includes: 1. quenching through heating at 860-920 deg.c in a furnace pre-heated to 860-920 deg.c for certain period and subsequent water cooling to room temperature; and 2. termpering through heating at 550-650 deg.c in a furnace pre-heated to 550-650 deg.c for certain period and subsequent cooling in the air. The low alloy structure steel Q345 through the heat treatment process has obviously raised mechanical performance, tensile strength higher than 510 MPa, yield strength Rp0.2 higher than 450 MPa, -20 Charpy impact value greater than 70J, and externsibility delta-5(%) greater than 20, and may be used in producing high strength parts, such as automobile axle parts.

Description

technical field [0001] The invention relates to a heat treatment method for structural steel, in particular to an improved low-alloy structural steel Q345 composite used in the production of axles, beams, tubes and other important parts of vehicles such as trailers, trucks, engineering machinery, and mining machinery. Performance heat treatment process. Background technique [0002] Low-alloy structural steel Q345 (old standard: 16Mn, 12MnV, 14MnNb, 16MnRE, 18Nb) is generally used in hot-rolled, normalized or annealed states in China. The mechanical properties of the material are relatively low, and the yield strength of the material is about 345MPa. Its chemical composition and mechanical properties are shown in Table 1 and Table 2: [0003] Table 1 Chemical Composition % of Low Alloy Structural Steel Q345 (GB / T1591-1994): [0004] [0005] Table 2 Mechanical Properties of Low Alloy Structural Steel Q345 (Normalizing State) (GB / T1591-1994): [0006] [0007] Axle b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D11/00C21D1/60
Inventor 闻振明
Owner BPW (MEIZHO) AXLE CO LTD