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Steel plate with low welding crack sensitivity and production method thereof

A technology with low welding cracks and production methods, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of complicated production process, impact toughness to be improved, difficult mass production, etc., and achieve good cold working performance, Significant solid solution strengthening effect and simple manufacturing process

Inactive Publication Date: 2008-01-02
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of steel plate has the following disadvantages in actual use: (1) High C content and C equivalent (Ceq): usually C content ≤ 0.09%, Ceq ≤ 0.42%; (2) The production process is complicated and difficult to mass produce ;(3) The impact toughness needs to be improved: the steel plate provided can meet the requirements of -15℃ AKV (longitudinal) ≥ 47J; (4) The welding process is more complicated, and pre-weld preheating and post-weld heat treatment are required; (5) The structure is sensitive to temperature Strong, the construction site can not be random arc and open grouting holes, etc., it is very inconvenient to use

Method used

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Embodiment Construction

[0021]The actual composition (by weight percentage) of the low-C bainite high-strength steel of the present invention is: C 0.05%, Si 0.29%, Mn 1.45%, P 0.008%, S 0.005%, Mo 0.27%, Nb 0.056%, V 0.047 %, B 0.0010%, Ti 0.012%, Pcm 0.18%, rolled into 25mm steel plate. Its mechanical properties: yield strength 560MPa, tensile strength: 665MPa, yield strength ratio = 0.84, δ5 ≥ 28%, -20 ℃ impact energy AKV (transverse direction) 231, 226, 223J, cold bending test D = 3a, 180 ° intact , -20°C 10% strain effective impact energy AKVs (transverse direction) 105, 108, 115J, thickness direction tensile section shrinkage Ψ is 68, 74, 49%, using GB6803-86 for non-plastic transition temperature drop weight test NDT temperature The temperature of the steel plate is -55°C. The weldability test of the steel plate is carried out by the welding laboratory of Beijing Iron and Steel Research Institute. The maximum hardness of the welding heat-affected zone is HV≤306. The inclined Y groove welding c...

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Abstract

The invention discloses a low-welding crack sensitivity steel board and manufacturing method, which comprises the following parts: not more than 0.07% C, 0.15-0.40% Si, 1.00-1.60% Mn, not more than 0.015% P, not more than 0.010% S, not more than 0.30% Cu, not more than 0.50% Ni, not more than 0.30% Cr, not more than 0.30% Mo, not more than 0.08% V, not more than 0.08% Nb, 0.010-0.020% Ti, not more than 0.003% B, Fe and inevitable impurity. The invention is characterized by the following: (1)displaying lower welding crack sensitivity component with Pcm not more than 0.20%; (2)mating the strength and flexibility reasonably with fitful yielding ratio; (3)making the price and property of the steel board superior to the congeneric import product; (4)making the maximum breadth of steel board to 4000mm; (5)simplifying the technique to ensure higher flatness without quenching water.

Description

technical field [0001] The invention relates to a WDB620 steel plate with low welding crack sensitivity, and also relates to a production method of the steel plate. Background technique [0002] At present, the 60Kg grade low-welding crack-sensitive high-strength steel produced by domestic and foreign hydropower station penstocks is delivered in a quenched and tempered state (quenching + tempering). , It is also clearly stipulated in the bidding documents of the materials: the delivery state of the steel plate selected for the high-strength steel pipe is the quenched and tempered state (quenching + tempering), or the quenched and tempered steel clearly designated as the XX grade, typically Wuhan Iron and Steel Company 07MnCrMoVR and SM570Q produced according to GB150 and JIS G3106 standards, and NK-HITEN590U2, NK-HITEN610U2 and other steel plates produced by NKK Corporation of Japan according to enterprise standards, have a low-C tempered martensite structure after quenching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/50C22C33/04C21C7/04C21D8/02C21D11/00B21B37/00B23K35/00
Inventor 叶建军刘新民常跃峰梁永昌谢良法崔强赵文忠郭桐林建农赵全卿吴永斌王培玉吴建鹏王九清田苗
Owner WUYANG IRON & STEEL
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