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High strength steel sheet having excellent brittle crack resistance and method for manufacturing same

A high-strength steel plate, brittle technology, applied in the field of iation) tools, can solve the problems of increased manufacturing cost and cumbersome manufacturing process.

Active Publication Date: 2012-10-24
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

However, since this patent requires an additional aging treatment after controlled rolling and accelerated cooling in a state where Cu is added in a large amount in order to obtain Cu precipitation, it may result in a cumbersome manufacturing process and an increase in manufacturing cost

Method used

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  • High strength steel sheet having excellent brittle crack resistance and method for manufacturing same
  • High strength steel sheet having excellent brittle crack resistance and method for manufacturing same
  • High strength steel sheet having excellent brittle crack resistance and method for manufacturing same

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Embodiment approach ）

[0068] Molten steel was prepared in a 300-ton electric furnace according to the composition shown in Table 1, and a 300 mm slab was prepared by a continuous casting method. As shown in Table 2, the slabs thus produced were heated and subjected to rough rolling and finish rolling, and steel products were produced through final accelerated cooling.

[0069] The electron backscatter diffraction pattern (EBSP) device installed in the scanning electron microscope (SEM) can be used to measure the effective particle size of the prepared steel plate. The magnification used was in the range of 300X-500X with a step size of 0.75 μm, and the thickness direction of the rolled cross-section and the plate center in the thickness direction were observed. In order to obtain meaningful data values, a minimum of 5000+ grains defined as boundaries with 15°+ grain misorientation was included. The effective particle diameter defined in the present invention is calculated by using software capable...

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Abstract

Provided is a steel plate having excellent resistance to brittle crack initiation in a parent material zone and a weld heat affected zone. More particularly, the present invention relates to a high-strength steel sheet having excellent resistance to brittle crack initiation which includes 0.02 wt% to 0.06 wt% of carbon (C), 0.1 wt% or less of silicon (Si), 1.5 wt% to 2.0 wt% of manganese (Mn), 0.012 wt% or less of phosphorous (P), 0.003 wt% or less of sulfur (S), 0.5 wt% to 1.5 wt% of nickel (Ni), 0.003 wt% to 0.015 wt% of aluminum (Al), 0.005 wt% to 0.02 wt% of titanium (Ti), 0.005 wt% to 0.015 wt% of niobium (Nb), 0.002 wt% to 0.006 wt% of nitrogen (N), and iron (Fe) as well as unavoidable impurities as a remainder, and has a value of C+0.5Si-0.1Ni+6Al+3Nb of 0.1% or less, and a method of manufacturing the high-strength steel sheet.

Description

technical field [0001] The present invention relates to high-strength steel plates for use in offshore structures and building structures, and more particularly to steel plates with excellent resistance to brittle crack initiation in base metals and welded heat-affected zones (Heat Affected Zone, HAZ). Resistant high-strength steel plate, and method of manufacture thereof. Background technique [0002] Based on the rapidly growing energy needs of emerging economic centers such as China and India, the development of oil resources in extremely cold regions, especially Sakhalin and the Arctic Ocean, is being pursued, areas that have not been developed before due to low yields. [0003] In order to ensure the safety of buildings, the steel used in buildings in extremely cold regions needs to have high resistance to low temperature brittle crack initiation. The Crack Tip Opening Displacement (CTOD) test based on fracture mechanics is mainly used as a method to evaluate the resis...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/02B21B3/02
CPCC22C38/14C21D8/0221C22C38/06C21D8/0226C21D9/50C22C38/12C21D2201/05C22C38/04C21D2211/005C22C38/001C22C38/08C21D2211/002B21B3/02C21D8/02
Inventor 金相镐房基铉徐仁植
Owner 浦项股份有限公司
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