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High-strength and high-manganese steel having excellent low-temperature toughness and manufacturing method therefor

A low-temperature toughness and high-strength technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of high Ni price and easy volatility, and achieve high-strength effects

Inactive Publication Date: 2019-06-07
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although 9Ni steel is superior in ensuring sufficient martensitic microstructure and high strength due to high hardenability due to high content of nickel (Ni) and reaching the ductile-brittle transition temperature (DBTT) of the parent material Favorable, but Ni may be too expensive and volatile, so there is a constant need to develop alternative steels

Method used

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  • High-strength and high-manganese steel having excellent low-temperature toughness and manufacturing method therefor
  • High-strength and high-manganese steel having excellent low-temperature toughness and manufacturing method therefor
  • High-strength and high-manganese steel having excellent low-temperature toughness and manufacturing method therefor

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Embodiment approach

[0096] Hereinafter, the present disclosure will be described more specifically according to an embodiment. However, the following examples should be considered in a descriptive sense only and not for purposes of limitation. The scope of the present disclosure is defined by the appended claims and modifications and variations therefrom may be reasonably made.

[0097] A slab having a thickness of 70 mm and having the composition shown in Table (1) below was heated to 1100° C. and then subjected to final hot rolling at a final hot rolling temperature of 800° C. to obtain a hot-rolled steel sheet with a thickness of 11.8 mm. After cooling at a cooling rate of 10°C / sec in the temperature range from Ar3 to 200°C, the hot-rolled steel sheet was heated to the annealing temperature described in Table 2, and then cooled to produce high manganese steel.

[0098] The microstructure of the high manganese steel was observed and shown in Table (2) below. The mechanical properties of the h...

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Abstract

An aspect of the present invention relates to a high-strength and high-manganese steel having excellent low-temperature toughness, the high-strength and high-manganese steel comprising, in terms of wt%, 4.3-5.7% of manganese (Mn), 0.015-0.055% of carbon (C), 0.015-0.05% silicon (Si), 0.6-1.7% of aluminum (Al), 0.01-0.1% of niobium (Nb), 0.015-0.055% of titanium (Ti),0.001-0.005% of boron (B), 0.03% or less of phosphor (P), 0.02% or less of sulfur (S), and the balance iron (Fe) and other inevitable impurities, wherein the microstructure thereof comprises, in terms of percent by volume, 40-60% of martensite and 40-60% of tempered martensite.

Description

technical field [0001] The present disclosure relates to high strength high manganese steels for structural steels having excellent low temperature toughness. Background technique [0002] It is known that a martensitic structural steel having high strength is difficult to use as a structural steel at a low temperature because the toughness of the martensitic structural steel decreases rapidly due to the ductile-brittle transition that occurs as the temperature decreases. In the case of high manganese steel containing a large amount of manganese in its chemical composition, the use of high manganese steel is limited due to grain boundary embrittlement in which fracture toughness is the worst. [0003] Generally, high-hardness steels contain a large amount of carbon and a large amount of alloying elements, and the quenching process is necessary to ensure a martensitic structure that can provide sufficient strength. [0004] However, as the thickness of the steel plate increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C22C38/12C21D8/02
CPCC21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0263C21D9/46C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D2211/008
Inventor 李一彻蔡在镕姜相德曹财荣吴洪烈苏泰逸
Owner POHANG IRON & STEEL CO LTD
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