Ultra-thick steel material having excellent resistance to brittle crack propagation and preparing method therefor

A technology of crack propagation and manufacturing method, applied in the field of ultra-thick steel and its manufacturing, can solve the problems of difficult application of manufacturing cost, and achieve the effect of excellent resistance to brittle crack growth

Active Publication Date: 2019-04-02
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, if a large amount of elements such as Ni is added, the resistance to brittle crack growth can be improved, but since Ni is an expensive element, it is difficult to apply it commercially in terms of manufacturing cost.

Method used

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  • Ultra-thick steel material having excellent resistance to brittle crack propagation and preparing method therefor
  • Ultra-thick steel material having excellent resistance to brittle crack propagation and preparing method therefor
  • Ultra-thick steel material having excellent resistance to brittle crack propagation and preparing method therefor

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Embodiment approach

[0106] The present invention will be described more specifically by way of examples below. It should be noted that the following examples are only used to illustrate the present invention, and are not intended to limit the scope of rights of the present invention. Because, the scope of rights of the present invention depends on the contents described in the claims and the contents reasonably derived therefrom.

[0107] The present invention is described below by way of examples.

[0108] (Example)

[0109] A steel slab having a thickness of 400 mm having the composition of Table 1 below was reheated at a temperature of 1070° C., and rough rolling was performed at a temperature of 1025° C. to produce a bar. The same cumulative reduction ratio was used during rough rolling, and the cumulative reduction ratio was 50%.

[0110] The thickness of the bar after the rough rolling is 200mm. After the rough rolling, the bar is cooled and then reheated. The surface reheating temperatu...

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Abstract

The present invention provides a high-strength ultra-thick steel material having excellent resistance to brittle crack propagation and a preparing method therefor. The present invention provides an ultra-thick steel material having excellent resistance to brittle crack propagation and a preparing method therefor, wherein the steel material comprises, in terms of weight%, 0.03-0.09% of C, 1.4-2.2%of Mn, 0.2-0.9% of Ni, 0.005-0.05% of Nb, 0.005-0.04% of Ti, 0.1-0.5 % of Cu, 0.05-0.5% of Si, 0.01-0.05% of Al, 100 ppm or less of P, 40 ppm or less of S, and the balance Fe and unavoidable impurities, and wherein a surface portion is composed of a mixed phase of polygonal ferrite and bainite; a portion corresponding to a thickness of 1 / 2t-1 / 4t (here, t is the thickness of steel material) is composed of 50 vol% or more of acicular ferrite and 50 vol% or less of bainite; and a fraction of a region having a bainite single-phase structure in the overall thickness of the steel material is 20% orless. According to the present invention, a high-strength ultra-thick steel material having excellent resistance to brittle crack propagation can be produced at high productivity.

Description

technical field [0001] The invention relates to an ultra-thick steel material with excellent brittle crack growth resistance and a manufacturing method thereof. More particularly, the present invention relates to an ultra-thick steel material for steel structures excellent in brittle crack growth resistance and productivity, and a method of manufacturing the same. Background technique [0002] Recently, ultra-thick, high-strength steel is required in the design of structures such as ships and the like at home and abroad. [0003] When designing a structure, if high-strength steel is used, the weight of the structure can be reduced, so economic benefits can be obtained, and since the thickness of the plate can be reduced, the ease of processing and welding operations can be ensured at the same time. [0004] Generally, when high-strength steel is made into ultra-thick steel, the overall structure is not sufficiently deformed due to a decrease in the total reduction ratio, an...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/08C22C38/16C22C38/14C22C38/12C22C38/02C22C38/06C21D8/06C21D9/00
CPCC21D8/06C21D9/00C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D9/0075C21D2211/002C21D2211/005
Inventor 李学哲张成豪
Owner 浦项股份有限公司
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