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Ultrahigh-strength martensitic steel for automobile and rolling method

An ultra-high-strength, martensitic steel technology, applied in the field of steel alloy materials, can solve the problems of poor hydrogen embrittlement resistance and high energy consumption of cold-formed steel at production costs, achieve high tensile strength, improve hydrogen storage capacity, and plasticity Good shape

Active Publication Date: 2021-10-01
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost of hot-formed steel is higher than that of cold-formed steel
Cold-formed martensitic steel can usually be further formed through a rolling process. Although the tensile strength of the current industrialized material can reach up to 1500Mpa, its resistance to hydrogen embrittlement is poor

Method used

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  • Ultrahigh-strength martensitic steel for automobile and rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, an ultra-high-strength martensitic steel for automobiles, which includes the following components by weight percentage: 0.21% of C, 0.21% of Si, 1.4% of Mn, 0.011% P, 0.0027% S, 0.04% Al, 0.14% Cr, 0.037% Ti, 0.0015% B, 0.017% V, 0.00181% Nb, 0.034% Ni, 0.14% Cu, The balance is Fe.

[0029] The rolling method of the ultra-high-strength martensitic steel for automobiles comprises the following steps:

[0030] Step 1: weighing according to the composition ratio of the above-mentioned ultra-high-strength martensitic steel for automobiles, and melting it into an austenitic billet.

[0031] Step 2, rolling the austenitic steel slab into a steel slab with a thickness of 20 mm, heating the steel slab to 1250° C. and keeping it warm for 2 hours, and then hot rolling to obtain a primary rolled steel plate with a thickness of 3.4 mm.

[0032] Step 3, the temperature of the primary rolled steel plate is lowered to 620°C, the cooling rate is 45°C / s, the temperature ...

Embodiment 2

[0041] Embodiment 2, an ultra-high-strength martensitic steel for automobiles, the weight percentage of Cu element is 0.1%, and the weight percentage of other components is the same as that of Embodiment 1.

[0042] The rolling method of the ultra-high-strength martensitic steel for automobiles comprises the following steps:

[0043] Step 1: weighing according to the composition ratio of the above-mentioned ultra-high-strength martensitic steel for automobiles, and melting it into an austenitic billet.

[0044] Step 2, rolling the austenitic steel slab into a steel slab with a thickness of 20mm, heating the steel slab to 1200°C and keeping it warm for 1.5h, and then hot rolling to obtain a primary rolled steel plate with a thickness of 3.4mm.

[0045] Step 3, the temperature of the primary rolled steel plate is lowered to 650°C, the cooling rate is 40°C / s, the temperature is kept for 45 minutes, and then cooled to room temperature in the furnace; by controlling the cooling rat...

Embodiment 3

[0050] Embodiment 3, an ultra-high-strength martensitic steel for automobiles, the weight percentage of Cu element is 0.3%, and the weight percentage of other components is the same as that of Embodiment 1.

[0051] The rolling method of the ultra-high-strength martensitic steel for automobiles comprises the following steps:

[0052] Step 1: weighing according to the composition ratio of the above-mentioned ultra-high-strength martensitic steel for automobiles, and melting it into an austenitic billet.

[0053] Step 2, rolling the austenitic steel slab into a steel slab with a thickness of 20 mm, heating the steel slab to 1230° C. and keeping it warm for 1 hour, and then hot rolling to obtain a primary rolled steel plate with a thickness of 3.4 mm.

[0054] Step 3, the temperature of the primary rolled steel plate is lowered to 600°C, the cooling rate is 50°C / s, the temperature is kept for 50 minutes, and then cooled to room temperature in the furnace; by controlling the cooli...

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Abstract

The invention discloses ultrahigh-strength martensitic steel for an automobile and a rolling method. The ultrahigh-strength martensitic steel for the automobile comprises the following components in percentage by weight: 0.2 to 0.3 percent of C, 0.21 to 0.4 percent of Si, 1.0 to 1.7 percent of Mn, 0.02 percent or less of P, 0.003 percent or less of S, 0.05 percent or less of Al, 0.01 to 0.2 percent of Cr, 0.01 to 0.04 percent of Ti, 0.001 to 0.002 percent of B, 0.01 to 0.05 percent of V, 0.05 percent or less of Nb, 0.01 to 0.05 percent of Ni, 0.1 to 0.3 percent of Cu and the balance of Fe. The alloy has high tensile strength and hydrogen embrittlement resistance and good comprehensive mechanical properties, and is suitable for manufacturing automobile structural parts.

Description

technical field [0001] The invention relates to the field of iron and steel alloy materials, in particular to ultra-high-strength martensitic steel for automobiles and a rolling method. Background technique [0002] As the most widely used structural material, steel is the most widely used structural material, and improving its strength has always been the direction of continuous efforts in the academic and industrial circles. High-strength steel with a tensile strength above 1300MPa can increase the structural strength of components and ensure safety while reducing weight. For example The development and application of high-strength steel materials are inseparable from the lightweight of automobiles and the improvement of safety performance. At present, the strength level of steel used for automobile collision safety parts in China is generally about 1500MPa ultra-high-strength steel. The ultra-high-strength steel refers to steel with a tensile strength above 1400Mpa. Main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/58C22C38/50C22C38/54C22C38/46C22C38/48C22C38/42C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/06C22C38/58C22C38/50C22C38/54C22C38/46C22C38/48C22C38/42C21D8/0226C21D8/0236C21D8/0247C21D1/18C21D2211/008
Inventor 刘波刘颖
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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