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Mncr alloyed hot forming steel and production method thereof

A production method and hot forming technology are applied in the field of ultra-high-strength automotive steel materials, which can solve the problems of increasing the difficulty of steelmaking and difficult to control the boron content, so as to improve the precision of composition control, simplify the steelmaking process, and increase the yield of finished products. and productivity effects

Active Publication Date: 2016-06-29
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the actual process, this kind of control often increases the difficulty of steelmaking, and the content of boron is also difficult to control

Method used

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  • Mncr alloyed hot forming steel and production method thereof
  • Mncr alloyed hot forming steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Measure the CCT curve of the steel slab obtained through continuous casting, measure the temperature-expansion rate curve at different cooling rates on the Gleeble3500 thermal simulation testing machine, and analyze the cooling curves at different cooling rates and the metallographic photos cooled to room temperature, and draw The CCT curve obtained is as figure 1 shown. The results show that Cr / Mn series steels for hot forming have good hardenability, and all martensitic structures can be obtained at a cooling rate of 20°C / s.

Embodiment 2

[0019] The steel slab obtained through continuous casting is heated to 1250°C, and after being kept for 60 minutes, it is put into a hot rolling mill for hot rolling. After 3 passes of rough rolling and 3 passes of finish rolling, a 4 mm hot-rolled steel plate for thermoforming is obtained. Heat the hot-rolled steel sheet for thermoforming to 930°C, keep it warm for 15 minutes, put it into a thermoforming testing machine for thermoforming to obtain a U-shaped part. The cooling rate of the steel plate during hot forming is about 20°C / s. The mechanical properties of the final thermoformed part are yield strength Rp=1030MPa, tensile strength Rm=1510MPa, uniform elongation Agt=5%.

[0020] After hot forming, the microstructure is all martensite, and the metallographic picture is as follows figure 2 shown.

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Abstract

The invention provides MnCr alloying thermal-forming steel. The MnCr alloying thermal-forming steel is characterized by mainly containing the following chemical elements in percent by weight: 0.15%-0.25% of C, 0.10%-0.25% of Si, 1.5%-2.2% of Mn, and 2.0%-2.5% of Cr. Main process parameters in a production process of the MnCr alloying thermal-forming steel are controlled as follows: a casting blank tapping temperature is controlled to 1230 DEG C-1250 DEG C, a hot-rolling finishing temperature is controlled to 920 DEG C-950 DEG C, a hot-rolling coiling temperature is controlled to 630 DEG C-660 DEG C, and a stamping cooling rate is controlled to 18 DEG C / scond-22 DEG C / second. A thermal-forming product produced by the MnCr alloying thermal-forming steel disclosed by the invention has mechanical performances as follows: yield strength Rp is 1030 MPa, tensile strength Rm is 1510 MPa, and uniform elongation rate Agt is 5%. All thermally-formed microscopic structures are martensite.

Description

technical field [0001] The invention belongs to the field of ultra-high-strength steel materials for automobiles, and in particular relates to the production technology of alloyed hot-forming steel. Background technique [0002] With the increasingly acute energy and environmental issues, in order to meet the challenges of energy shortage and environmental pollution, and to reduce energy consumption and exhaust emissions, the requirements for lightweight transportation vehicles are becoming more and more urgent. The fuel consumption of a car mainly depends on the displacement of the engine and the total mass of the car. Under the premise of keeping the overall quality, performance and cost of the car unchanged, it is important to reduce the weight of the car itself to increase output power, reduce noise, improve maneuverability, reliability, increase vehicle speed, reduce fuel consumption, reduce exhaust emissions, and improve safety. The ultimate goal of lightweight vehicl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38
Inventor 刘永刚张建朱国辉谷海容周志斌詹华陈其伟张武李沁怡张军汤亨强汪永国张庆安
Owner MAGANG (GROUP) HOLDING CO LTD
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