Thick steel plate with great line energy and low welding crack sensitivity and its production process

A technology with low welding cracks and large heat input, which is applied in the field of welded structural steel and high-strength steel with high heat input and low welding crack sensitivity. It can solve the problems of low steel plate strength and achieve good performance, simple design, and low welding cracks. The effect of sensitivity

Inactive Publication Date: 2007-03-21
ANGANG STEEL CO LTD
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[0052] The chemical composition of the steel of the present invention is (by weight percentage), C: 0.6~0.10%, Si: 0.15~0.40%, Mn: 1.20~1.60%, P: ≤0.015%, S: ≤0.007%, Ni: 0.15~ 0.40%, Cr: ≤0.30%, Mo: 0.15-0.30%, V: 0.02-0.06%, and the balance is Fe and unavoidable inclusions. In addition, the steel chemical composition of the present invention must also meet:

[0053] Pcm=C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B≤0.20%;

[0054] In the specific implementation of the present invention, the content of the following elements is adjusted, C: 0.06% to 0.08%, Si: 0.15% to 0.30%, Mn: 1.40% to 1.55%, Ni: 0.20% to 0.30%, Mo: 0.20% to 0.30%, Als: 0.015% to 0.045%, Ti: 0.010% to 0.025%, Nb: 0.015% to 0.030%. The thickness of the finished steel plate produced is ≤20.0mm.

[0055] In the implementation of the present invention, the following element contents are adjusted, C: 0.08%~0.10%, Si: 0.15%~0.30%, Mn: 1.25%~1.45%, Ni: 0.25%~0.40%, Mo: 0.15%~ 0.25%, Als: 0.015% to 0.045%, Ti: 0.0...

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Abstract

The present invention discloses one kind of thick steel plate with great line energy and low welding crack sensitivity and its production process. The chemical composition includes C 0.06-0.10 wt%, Si 0.15-0.40 wt%, Mn 1.20-1.60 wt%, P not more than 0.015 wt%, S not more than 0.007 wt%, Ni 0.15-0.40 wt%, Cr not more than 0.30 wt%, Mo 0.15-0.30 wt%, V 0.02-0.06 wt%, Al 0.015-0.045 wt%, Ti 0.010-0.034 wt%, except Fe and inevitable impurities; and meets Pcm not higher than 0.20 %. The production process includes pre-treatment of molten iron, smelting in converter, LF furnace plus VD furnace vacuum treatment, two stage controlled rolling, on-line laminar flow cooling, tempering at 600-680 deg.c and other steps. The produced steel plate has no need of quenching and tempering treatment.

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 610 MPa and low welding crack sensitivity with large input energy. 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 high-strength steel plate with a tensile strength of 600MPa and low welding crack sensitivity basically adopts quenching and tempering production technology, almost all of which add B to ensure the hardenability of the steel, without considering the problem of large heat input welding. 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, especial...

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Application Information

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IPC IPC(8): C22C38/14C22C38/50C21D8/02B21B37/74
Inventor 张禄林郝森王丽慧徐烈山陈涛苏国阳高文涛信昕丛津功梁福鸿徐光刘曙光潘玲
Owner ANGANG STEEL CO LTD
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