Thick steel plate with high strength and low welding crack sensitivity and its production process

A technology with low welding cracks and production methods, applied in the direction of temperature control, etc., can solve the problems of unrecorded production, limited steel plate thickness, low steel plate strength, etc., and achieve the effects of simple production process, good performance after welding, and simple design

Inactive Publication Date: 2009-07-22
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strength of this steel plate is low
Moreover, the content of Nb and V in the steel is limited by the formula 625 (effective Nb) + 250V + 210Ceq ≥ t + 40 (t is the thickness of the steel plate in mm), so the thickness of the steel plate is also limited
[0006] At present, there is no record on the production of relevant high-strength and low-welding crack-sensitive steel plates (thickest over 75mm) in China.

Method used

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  • Thick steel plate with high strength and low welding crack sensitivity and its production process
  • Thick steel plate with high strength and low welding crack sensitivity and its production process
  • Thick steel plate with high strength and low welding crack sensitivity and its production process

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Embodiment Construction

[0048] The chemical composition of the steel of the present invention is (by weight percentage), C: 0.06% to 0.09%, Si: 0.15% to 0.55%, Mn: 1.00% to 1.60%, P≤0.015%, S≤0.006%, Ni: 0.15 %~0.40%, Cr: 0%~0.06%, Mo≤0.30%, Cu≤0.30%, V: 0.02%~0.06%, Nb: 0.005%~0.05%, Als: 0.010%~0.04%, the balance is Fe and inevitable inclusions.

[0049] In addition, the steel chemical composition of the present invention must also meet:

[0050] Pcm=C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B≤0.20%;

[0051] Ceq=C+Mn / 6+Si / 24+Ni / 40+Cr / 5+Mo / 4+V / 14≦0.40%.

[0052] The specific scheme of the present invention has when producing the steel plate below 40mm, C in steel: 0.06%~0.07%, Si: 0.15%~0.30%, Mn: 1.20%~1.50%, P≤0.015%, S≤0.006%, Ni: 0.15%~0.25%, Mo: 0.15%~0.25%, Cu: 0.05%~0.15%, V: 0.02%~0.04%, Nb: 0.005%~0.02%, Als: 0.010%~0.040%, the balance is Fe and inevitable inclusions. Pcm max 0.187%, Ceq max 0.404%.

[0053] The specific scheme of the present invention is that when producing 40-75mm st...

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Abstract

The present invention discloses one kind of thick steel plate with high strength and low welding crack sensitivity and its production process. The chemical composition includes C 0.06-0.09 wt%, Si 0.15-0.55 wt%, Mn 1.00-1.60 wt%, P not more than 0.015 wt%, S not more than 0.006 wt%, Ni 0.15-0.40 wt%, Cr not more than 0.30 wt%, Mo not more than 0.30 wt%, Cu not more than 0.30 wt%, V 0.02-0.06 wt%, Nb 0.005-0.05 wt% and Als 0.010-0.04 wt%, except Fe and inevitable impurities; and meets Pcm not higher than 0.20 % and Ceq not higher than 0.42 %. The production process includes two stage controlled rolling, on-line laminar flow cooling, off-line tempering and other steps. The produced steel plate has thickness up to 75mm, tensile strength not lower than 610 MPa and very low welding crack sensitivity.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and relates to a steel for welding structure, in particular to a high-strength steel with a tensile strength of 610Mpa and low welding crack sensitivity and a production method thereof. Background technique [0002] Prior to the present invention, JP-A-49-37814 and JP-A-4-13406 have disclosed techniques for reducing the sensitivity of welding cracks, reducing C and adding Ti-B. Up to now, the tensile strength 600Mpa grade low welding crack susceptibility high-strength steel plate basically adopts quenching and tempering production technology, almost all of which add B to ensure the hardenability of the steel. Using B to ensure the strength of the steel and increase the hardenability of the steel, the chemical composition and manufacturing conditions will change, which may lead to unstable properties of the base metal, especially the hardness of the welding heat-affected zone is signif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/46C21D8/02C21D10/00B21B37/74
Inventor 苏国阳张禄林郝森高亮徐烈山王丽慧梁福鸿李新玲信昕马成刘曙光马玉璞
Owner ANGANG STEEL CO LTD
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