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A kind of preparation method of non-quenched and tempered steel for automobile chassis

A non-quenched and tempered steel, automobile chassis technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of high cost, unstable internal structure and grain size control, long production process, etc., to reduce The effect of composition segregation, avoiding grain growth and reducing production cost

Active Publication Date: 2022-04-19
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for preparing non-quenched and tempered steel for automobile chassis parts in order to solve the problems of long production process, high cost, unstable internal structure and grain size control of non-quenched and tempered steel for automobile chassis parts

Method used

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  • A kind of preparation method of non-quenched and tempered steel for automobile chassis
  • A kind of preparation method of non-quenched and tempered steel for automobile chassis
  • A kind of preparation method of non-quenched and tempered steel for automobile chassis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 relates to the preparation or production method of non-quenched and tempered steel for automobile chassis parts, wherein in the non-quenched and tempered steel billet heating step, the billet is heated by a heating furnace, and the control range of the heating temperature is: the temperature of the preheating section is 660 ℃, heating time 40min; first-stage heating 900℃, heating time 60min; second-stage heating 1120℃, heating time 60min; third-stage heating 1000℃, heating time 80min.

[0034] Through the above-mentioned reasonable heating temperature and holding time of the preheating section and the three-stage method, the non-quenched and tempered steel material can be solid solution treated, the alloy elements are solid-dissolved into the matrix, the material components are uniformly dispersed, and the composition segregation is reduced, avoiding The original austenite grain grows and has sufficient plasticity during rolling, which lays the foundation fo...

Embodiment 2

[0045] Like the preparation steps of Example 1, in the billet steel ingot heating step of Example 2, the steel ingot is heated by a heating furnace, and the control range of the heating temperature is: the temperature of the preheating section is 800°C, and the heating time is 60min; The time is 100min; the second stage is heated at 1200°C, and the heating time is 100min; the third stage is heated at 1080°C, and the heating time is 100min.

[0046] In the controlled rolling and controlled cooling step, the initial rolling temperature is 1010°C; the intermediate rolling temperature is 880°C; #The temperature of the water-cooled box is 850°C, and the temperature of the bar after passing through all the last group of cooling water tanks is controlled at 720°C; the temperature of the upper cooling bed is 680°C.

[0047] Among them, when entering the 1# water cooling box, the control pump frequency is 45Hz; the water nozzle pressure is 3.0MPa; the valve opening is 25%; the water fl...

Embodiment 3

[0051] As in the preparation steps of Example 1, the control range of the heating temperature of the billet ingot in Example 3 is: the temperature of the preheating section is 860°C, and the heating time is 70min; the heating period of the first stage is 1080°C, and the heating time is 130min; 130min; three-stage soaking at 1150°C, heating time 135min.

[0052] The initial rolling temperature is 1035°C; the intermediate rolling temperature is 890°C; the temperature of the 1# water cooling box is 920°C; the finishing rolling temperature is 925°C; the temperature of the 2# water cooling box is 935°C, and the bar passes through all the last group of cooling water tanks The final redness temperature is controlled at 750°C; after sizing by the sizing machine, the temperature of the upper cooling bed is 701°C.

[0053] Among them, the control pump frequency is 45Hz when passing through the water for cooling into the 1# water cooling box; the water spray pressure of the water nozzle ...

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Abstract

A method for preparing non-quenched and tempered steel for automobile chassis, comprising the following production steps: a billet heating process, a controlled rolling and controlled cooling step, a sizing step, and a cooling step; wherein, the billet heating includes a preheating section and a three-stage heating The process; the controlled rolling and controlled cooling steps include preliminary rolling, intermediate rolling, primary water cooling, finish rolling, and secondary water cooling; the non-quenched and tempered steel for automobile chassis produced by the preparation method of the present invention has ferrite+ Pearlite structure, grain size above 7.5, tensile strength 940-990Mpa, yield strength 600-650Mpa, impact toughness 41-48J; mechanical properties such as strength and toughness of steel are improved, fatigue resistance and tensile strength are improved. The tensile strength fully meets the technical and quality requirements of non-quenched and tempered steel for automobile chassis parts.

Description

technical field [0001] The invention relates to the field of metal material manufacturing, in particular to a method for preparing non-quenched and tempered steel for automobile chassis components. Background technique [0002] In today's society, the requirements for automobile products are getting higher and higher, and higher requirements are put forward for the materials used for automobile chassis parts. It is not only required that the steel used for automobile chassis parts can save energy and reduce consumption, reduce manufacturing costs, but also require better comprehensive mechanical properties. Meet the requirements of high-performance automotive materials. The application of non-quenched and tempered steel can reduce the energy consumption of the automotive industry in the production of parts and heat treatment, reduce the weight of the car body, and help realize the lightweight of the car. Because non-quenched and tempered steel is characterized by fine grain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B45/02B21B45/00B21B37/74B21B37/00C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C21D8/00
CPCB21B37/74B21B37/00B21B45/0215B21B45/004C22C38/04C22C38/02C22C38/46C22C38/50C22C38/48C22C38/44C22C38/06C22C38/002C21D8/005C21D2211/009C21D2211/005
Inventor 王军屈小波薛伟江张华刘绍康查亚鑫寿先涛孟婉君
Owner JIANGSU YONGGANG GROUP CO LTD
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