High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof

A technology for engineering structure and extra-thick steel plate, which is applied in the field of high-performance extra-thick steel plate for 500MPa engineering structure and its manufacturing field, can solve the problems of insufficient weather resistance, poor welding performance, poor comprehensive performance, etc. The effect of low cold crack index and high through-thickness properties

Inactive Publication Date: 2013-12-11
JIGANG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The steel plates recorded in the above three patent application documents have poor comprehensive properties, such as poor welding performance, high yield strength ratio, and insufficient weather resistance, and cannot meet the current actual needs...

Method used

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  • High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof
  • High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof
  • High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Pcm=0.17 and I=6.56 calculated in Example 1; Pcm=0.19 and I=6.78 calculated in Example 2.

[0061] The technological process of steel plate production in the present invention is: molten iron pretreatment→converter smelting→LF / RH refining→continuous casting→slab slow cooling→slab heating→rolling→cooling→inspection, testing→storage.

[0062] Steelmaking process: Clean steel smelting and continuous casting process is adopted. The molten iron is pretreated by desulfurization and smelted in a converter with top-bottom combined blowing. LF outbound molten steel [S]≤0.005%, RH outbound molten steel [H]≤0.0002%, RH outbound molten steel [S]≤0.0020%. The continuous casting tundish adopts alkaline covering agent, the crystallizer adopts low-carbon micro-alloy mold slag, and the whole process adopts ladle capping, ladle protection sleeve, and tundish submerged nozzle protection pouring, and the N increase in the continuous casting process is controlled to be no more than 0.0003...

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Abstract

The invention belongs to the technical field of low alloy steels and production processes thereof, and particularly relates to a high-property super-thick steel plate for a 500 MPa-level engineering structure and a manufacturing method thereof. The high-property super-thick steel plate comprises the following components in percentage by weight: 0.020%-0.070% of C, 0.30%-0.60% of Si, 1.35%-1.60% of Mn, 0.010%-0.020% of P, S<=0.005%, 0.030%-0.060% of Nb, 0.010%-0.030% of Ti, 0.020%-0.050% of Als, 0.35%-0.45% of Cu, 0.20%-0.40% of Cr, 0.30%-0.60% of Ni, 0.05%-0.10% of Mo and the balance of Fe and inevitable impurities. In addition, the high-property super-thick steel plate disclosed by the invention meets the requirements that the welding cold cracking sensitivity coefficient Pcm is less than or equal to 0.20% and the ASTMG101-01 corrosion-resistant index I is more than 6.0. The manufacturing method disclosed by the invention adopts the low-C Cu-Ni-Cr-Mo-Nb-Ti component system, prevents the grain in an HAZ (Welding Heat Affected Zone) from being growingn because a grain refining effect achieved by compositely adding Nb-Ti is higher than the grain refining effect achieved by independently using V, enhances the obdurability of a steel plate base body and HAZ and is contributivee to enhancinge the welding line energy.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel and its production process, and in particular relates to a high-performance extra-thick steel plate for 500MPa-level engineering structures and a manufacturing method thereof. Background technique [0002] Large-scale engineering structures are developing towards all-welded structures and high parameters. The safety and reliability of structures put forward higher requirements for the strength, toughness, weldability, and seismic performance of steel. Therefore, material workers at home and abroad have proposed high-performance steel ( High Performance Steel) concept. High-performance steel refers to the steel with one or several properties of the material that have been significantly improved compared with traditional steel. substantial improvement. According to the classification of steel products in my country, medium and thick plates with a thickness greater than 60mm are generally c...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C33/04C21D8/02
Inventor 周兰聚孙卫华刘晓东贾慧领胡淑娥侯东华宋国栋谢晖王勇
Owner JIGANG GRP
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