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Warm-hot forming method for boron-free medium-manganese steel

A warm forming, manganese steel technology, applied in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of restricting the lightweight and safety of automobiles, low elongation, etc., to improve the lightweight and safety, high The effect of elongation, high plastic mechanical properties

Inactive Publication Date: 2015-06-24
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the development and research of hot-formed boron steel is mainly carried out in the world. Germany Benteler (Arcelor) has launched USIBOR1500 boron alloy steel to occupy the international market of automobile hot-formed stamping parts. However, the elongation of hot-formed boron steel is relatively low. (less than 8%), causing its strong plastic product to be only about 12GPa%, which limits the further improvement of automobile lightweight and safety

Method used

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  • Warm-hot forming method for boron-free medium-manganese steel
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  • Warm-hot forming method for boron-free medium-manganese steel

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Embodiment 1

[0033] The boron-free medium-manganese steel sheet (the weight percent of its chemical composition is: C: 0.1%; Mn: 5%; P: 0.015%; S: 0.015%; N: 0.005%; the balance is Fe and unavoidable impurities) Raise the temperature to 800°C, keep it warm for 3 minutes, transfer it to the stamping die, the stamping temperature is 500°C, quench it at a cooling rate of 10°C / s, and hold the pressure for 10s. Using the above process parameters to make the B-pillar of the automobile, such as figure 2 , image 3 , and select 11 representative points from above (such as the edge of the side wall of the B-pillar structural member or the upper plane of the structural member or the edges of the two ends of the structural member, etc.), and measure the relevant mechanical properties As in Table 1.

[0034] Each mechanical performance parameter value at the corresponding point of the present invention in table 1

[0035]

[0036] It can be seen from the measured mechanical properties that the ...

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Abstract

The invention discloses a warm-hot forming method for boron-free medium-manganese steel. The method is characterized by comprising the following steps: austenitizing pretreatment, namely heating a sheet to 750-820 DEG C at the heating rate of not lower than 10 DEG C / s, and carrying out heat preservation for 3-10 minutes; a sheet transferring process, namely cooling the sheet to a stamping temperature of 450-700 DEG C at the cooling rate of not lower than 5 DEG C / s, and transferring to a stamping mold; heat-resistant stamping and pressurizing-quenching treatment, namely transporting the sheet below the stamping mold, forming, and simultaneously carrying out heat-retaining quenching, wherein the quenching cooling rate is greater than 5 DEG / s; and the pressurizing time is 5-20s; and post-treatment, namely carrying out shot blasting on a formed sample piece, and anti-rust oil coating treatment. The warm-hot forming method provided by the invention conforms to industrial production of the boron-free medium-manganese steel, and has the advantages that the manufacture cost is reduced and the strength and plasticity of a steel part are improved; the new generation of automobile is promoted to reach a relatively high step in the aspects of light weight, fuel conservation and safety; and the warm-hot forming method is simple in technological process and convenient to operate.

Description

technical field [0001] The invention relates to the field of warm stamping and forming, in particular to a warm forming method for building automobile steel (boron-free medium-manganese steel, ie TG steel) structural parts. Background technique [0002] Energy saving and environmental protection have become the trend of technological development in the global automotive industry. Therefore, the use of high-strength steel structural parts is one of the most effective ways to achieve this goal through "automobile lightweight". With the in-depth understanding of vehicle safety, people have found that only increasing the strength of steel can no longer meet the design requirements. High-strength plastic-plastic steel structural parts with both high strength and high plasticity can greatly improve the safety performance of vehicles. Therefore, its development and Application has become the frontier issue of domestic and foreign research. However, the strength and plasticity of ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/02B21D22/02B21D37/16
Inventor 常颖王存宇赵坤民李晓东任大鑫胡平郑国君靳菲李树娟
Owner DALIAN UNIV OF TECH
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