Method for producing 380MPa-grade wheel steel

A production method and 380mpa technology, applied in the field of materials, can solve the problems of low bending fatigue life, fatigue failure, and poor resistance to alternating stress of benches, and achieve the effects of low cost, improved welding performance, and reduced brittle transition temperature.

Inactive Publication Date: 2015-11-25
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Automobile wheels made of ordinary carbon structural steel have poor resistance to alternating stress and low bending fatigue life of the bench, and fatigue damage will occur after a period of oper

Method used

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  • Method for producing 380MPa-grade wheel steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The mass percentage of the chemical composition of the billet is: C: 0.07%, Si: 0.02%, Mn: 0.90%, P: 0.014%, S: 0.006%, Ti: 0.020%, Als: 0.030%, the rest is Fe and unavoidable Impurities.

[0016] Put the above billet into the heating furnace for heating. The slab is required to be hot loaded into the furnace, and it is required to be fully heated before ≤1000°C. It is required to be heated rapidly in the heating section and soaking section to reach the specified furnace temperature of the slab to prevent austenite crystallization. The grain size grows, the steel slab reaches 1200 °C, and the heating time is 140 minutes. After heating, the slab is descaled by high-pressure water and then rough and finish rolling. The billet thickness is 45mm, the coiling temperature of the hot coil box is 1000 °C, the finishing rolling is rolled by 7 rolling mills, the final rolling temperature is 890 °C, the laminar cooling rate is 27 °C / s, the coiling temperature is 600 °C, and the ex...

Embodiment 2

[0018] The mass percentage of the chemical composition of the billet is: C: 0.08%, Si: 0.04%, Mn: 0.92%, P: 0.011%, S: 0.002%, Ti: 0.024%, Als: 0.032%, the rest is Fe and unavoidable Impurities.

[0019] Put the above billet into the heating furnace for heating. The slab is required to be hot loaded into the furnace, and it is required to be fully heated before ≤1000°C. It is required to be heated rapidly in the heating section and soaking section to reach the specified furnace temperature of the slab to prevent austenite crystallization. The grain size grows, the steel billet reaches 1200 ° C, and the heating time is 200 minutes; after heating, the slab is descaled by high-pressure water and then rough and finish rolling. The billet thickness is 45mm, the coiling temperature of the hot coil box is 1020°C, the finishing rolling is rolled by 7 rolling mills, the final rolling temperature is 870°C, the laminar cooling rate is 29°C / s, the coiling temperature is 550°C, and the exp...

Embodiment 3

[0021] The mass percentage of the chemical composition of the billet is: C: 0.06%, Si: 0.05%, Mn: 0.80%, P: 0.010%, S: 0.005%, Ti: 0.010%, Als: 0.050%, the rest is Fe and unavoidable Impurities.

[0022] Put the above billet into the heating furnace for heating. The slab is required to be hot loaded into the furnace, and it is required to be fully heated before ≤1000°C. It is required to be heated rapidly in the heating section and soaking section to reach the specified furnace temperature of the slab to prevent austenite crystallization. The grain size grows, the steel slab reaches 1180 °C, and the heating time is 180 minutes. After heating, the slab is descaled by high-pressure water and then rough and finish rolling. The rough rolling is rolled in 5 passes. The thickness of the billet is 32mm, the coiling temperature of the hot coil box is 980°C, the finishing rolling is rolled by 7 rolling mills, the final rolling temperature is 890°C, the laminar cooling rate is 30°C / s, t...

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Abstract

The invention discloses a method for producing 380MPa-grade wheel steel and belongs to the technical field of materials. According to the technical scheme, the method for producing the 380MPa-grade wheel steel comprises the following technological steps that plate blank heating, high-pressure water dephosphorization, rough rolling, coiling through a hot coil box, finish rolling, laminar cooling and curling through a curling machine are conducted on a billet, and then the 380MPa-grade wheel steel is obtained. The billet comprises, by mass, 0.06%-0.10% of C, equal to or less than 0.10% of Si, 0.80%-1.10% of Mn, equal to or less than 0.020% of P, equal to or less than 0.010% of S, 0.010%-0.030% of Ti, 0.015%-0.050% of Als and the balance Fe and inevitable impurities. Ti is added into an original C-Mn strengthening system, and thus the strength and the weldability of the wheel steel are improved. Through the design of low-carbon and low-silicon components and reasonable adding of the Als, free N in the steel can be controlled, and the comprehensive performance of the wheel steel is improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a production method for producing 380MPa grade steel for wheels. Background technique [0002] With the development of the modern automobile industry, the performance requirements of automobile parts are becoming more and more stringent. Wheels are the main safety components for driving a car. It is also an important factor affecting the performance of the vehicle. Automobile wheels made of ordinary carbon structural steel have poor resistance to alternating stress and low bending fatigue life of the bench, and fatigue damage will occur after a period of operation. Therefore, there is an urgent need for upgrading of materials. The use of special steel for automobile wheels is The most effective measure to prolong the service life of automobile wheels. New materials require higher strength, good plastic toughness, excellent creep resistance and fatigue resistance,...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 蒋建军李凤臣王全利尹志尧马海峰张春雷
Owner HEBEI IRON AND STEEL
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