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High-tensile-strength steel plate and process for producing same

A manufacturing method and high tension technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of reduced hot ductility and hindered productivity, etc., and achieve the effect of excellent CTOD characteristics

Active Publication Date: 2016-11-16
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies improve strength by precipitation of Cu through aging treatment, but since a large amount of Cu is added, hot ductility decreases and productivity is hindered

Method used

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  • High-tensile-strength steel plate and process for producing same
  • High-tensile-strength steel plate and process for producing same

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Experimental program
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Effect test

Embodiment

[0116] Continuously cast steel slabs having the steel codes A to Z and the composition of A1 shown in Table 1 were used as raw materials, hot rolled and heat treated to produce thick steel plates with a thickness of 50 mm to 100 mm. As an evaluation method of the base material, for a tensile test, a JIS No. 4 test piece is taken from a position of 1 / 2 of the thickness of the steel plate so that the longitudinal direction of the test piece is perpendicular to the rolling direction of the steel plate, and the yield stress is measured according to JIS Z2241 ( YS) and tensile strength (TS).

[0117] In addition, for the Charpy impact test, a JIS V notch test piece is taken from the 1 / 2 position of the steel plate thickness so that the longitudinal direction of the test piece is perpendicular to the rolling direction of the steel plate, and the absorbed energy vE at -40°C is measured. -40 ℃. Will meet YS≥460MPa, TS≥570MPa and vE -40 All the steel plates with °C ≥ 200J were evalua...

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Abstract

The invention discloses a high-tensile-strength steel plate and a process for producing the same. The high-tensile-strength steel plate produced on the basis of a novel composition design whereby the yield stress is rendered unaffected by plate thickness and even the steel plate with a thickness of 100 mm or greater is guaranteed to have performance equal to that of the steel plate with a thickness of 50 mm. The high-tensile-strength steel plate has a composition which contains, in terms of mass%, 0.02-0.08% C, 0.01-0.35% Si, 1.4-2.0% Mn, up to 0.007% P, up to 0.0035% S, 0.010-0.060% Al, 0.5-2.0% Ni, 0.10-0.50% Mo, 0.005-0.040% Nb, 0.005-0.025% Ti, less than 0.0003% B, 0.002-0.005% N, 0.0005-0.0050% Ca, and up to 0.003% O and in which the components satisfy given relationships.

Description

technical field [0001] The present invention relates to a high-tensile steel plate used in steel structures such as ships, marine structures, pressure vessels, and pressure steel pipes, and a manufacturing method thereof. In particular, it relates to a high-tensile steel sheet having a yield stress (YS) of 460 MPa or more, which is excellent not only in the strength and toughness of the base material but also in the low-temperature toughness of the welded portion when multilayer welding is performed, and a method for producing the same. Background technique [0002] Steels used in ships, marine structures, and pressure vessels are joined by welding and finished into structures of desired shape. Therefore, from the viewpoint of the safety of structures, it is natural that these steels require high strength and excellent toughness of the base metal from the viewpoint of the safety of structures, and also require welded joints (weld metal, Heat-affected zone) is also excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/14C22C38/58
CPCC21D1/18C21D1/25C21D8/0226C21D8/0247C21D8/0263C21D9/46C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 一宫克行柚贺正雄长谷和邦远藤茂
Owner JFE STEEL CORP