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High manganese high strength steel sheets with excellent crashworthiness, and method for manufacturing of it

A high-strength steel plate and crash-resistant technology, applied in the field of high machinability high-strength steel plate and its manufacturing, can solve problems such as low yield strength

Inactive Publication Date: 2009-05-13
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high manganese steel sheet has a low yield strength due to its austenitic structure, therefore, there are still unresolved issues regarding the high manganese steel sheet

Method used

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  • High manganese high strength steel sheets with excellent crashworthiness, and method for manufacturing of it
  • High manganese high strength steel sheets with excellent crashworthiness, and method for manufacturing of it
  • High manganese high strength steel sheets with excellent crashworthiness, and method for manufacturing of it

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Experimental program
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Effect test

Embodiment approach

[0052] Hereinafter, exemplary embodiments of the present invention will be described in detail.

[0053] [example]

[0054] The steels of the present invention and comparative steels are listed in Table 1 below, and the molten steel ingots were kept in a heating furnace at 1200° C. for one hour, and then hot-rolled. At this time, the hot rolling finish temperature (hot rolling finish temperature) was 900°C, and the coiling temperature was 650°C. Some hot-rolled steel sheets were processed into tensile test samples according to the JIS5 standard, and the tensile strength of the tensile test samples was tested using a conventional general-purpose testing machine. Then, the hot-rolled steel sheet was pickled and cold-rolled at a cold reduction ratio of 50%. The cold-rolled test samples were successively annealed, simulated and heat-treated at an annealing temperature of 800°C and an overaging temperature of 400°C. After successive annealing, simulation and heat treatment proce...

example 2

[0065] The high-strength steel sheet having an austenite single phase and having high workability and high manganese produced in Example 1 was cold-rolled again, and its mechanical properties were measured. The results are listed in Table 3 below.

[0066] table 3

[0067] YS TS T-El Rolling amount Remark 19 471.3 939.9 60.4 0 contrasting steel 19-1 750.5 1047.2 44.6 10 steel of the invention 19-2 930.5 1209.7 22.2 20 steel of the invention 19-3 1088.3 1371.3 12.5 30 steel of the invention 19-4 1247.7 1554.2 8.6 40 steel of the invention 19-5 1388.2 1704.1 6.8 50 steel of the invention 19-6 1503.6 1808.6 4.6 60 steel of the invention 19-7 1612.8 1924.5 2.8 70 steel of the invention

[0068] As shown in Table 3, it was shown that the yield strength of the high-strength steel plate was improved. It is generally seen that the yield strength increases to 750 MPa or more in 10% ...

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Abstract

There are provided a high-workability high strength steel sheet with excellent workability due to the high elongation and excellent crashworthiness due to the high yield strength, and a method for manufacturing of it. The high manganese steel sheet includes, by weight: carbon (C): 0.2 to 1.5%, manganese (Mn): 10 to 25%, aluminum (Al): 0.01 to 3.0%, phosphorus (P) 0.03% or less, sulfur (S): 0.03% or less, nitrogen (N): 0.040% or less, at least one selected from the group consisting of silicon (Si): 0.02 to 2.5%, titanium (Ti): 0.01 to 0.10% and niobium (Nb): 0.01 to 0.10%, and the balance of Fe and other inevitable impurities. The high manganese steel sheet may be a hot-rolled steel sheet, a cold-rolled steel sheet, or a plated steel sheet, and is suitable for elaborate internal sheets as well as structural members of a car body since it has press workability due to the high elongation and high strain hardening index. Also, the high manganese steel sheet may be used for parts such as a front side member of an automobile since, among its characteristics, the steel sheet has an excellent impact absorbing ability.

Description

technical field [0001] The present invention relates to a high-manganese steel sheet for automobile steel sheets and a manufacturing method thereof, and more particularly, to a high-workability high-strength steel sheet having excellent properties due to high elongation and a manufacturing method thereof. Excellent machinability and excellent crashworthiness due to high yield strength. Background technique [0002] Automotive companies are increasingly adopting lightweight and high-strength materials in order to prevent environmental pollution and improve fuel efficiency and stability. Lightweight and high strength are one of the important characteristics that materials used for structural parts other than automotive parts should have . However, an increase in the strength of a material leads to a deterioration in the elongation of the steel, and therefore, all dual-phase steels, transformation-induced plasticity steels, etc., which have excellent formability, have been inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04
CPCC22C38/04C22C38/06C21D8/02
Inventor 金成圭陈光根孙一领
Owner POHANG IRON & STEEL CO LTD
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