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Mo-V synergistic easy-to-weld steel plate with tensile strength of 1,000 MPa and production method thereof

A technology of tensile strength and synergistic effect, applied in the field of welding steel, can solve the problems that joint performance cannot meet high tensile strength, heat input energy welding cannot be realized, and welding efficiency is low, so as to achieve excellent resistance to temper softening energy, Guarantee service safety performance and efficient welding effect

Active Publication Date: 2021-09-28
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the greater the welding heat input, the more significant the softening of the joint, which makes it difficult for the joint performance to meet the relevant index requirements of high tensile strength equal to that of the base metal
[0005] Chinese patent CN111375926A discloses a method for welding ultra-high-strength steel plate Q1150 for hydraulic supports, the welding heat input is ≤1.25kJ / cm, and the welding efficiency is far lower than the 31-40kJ / cm of the present invention
[0006] Chinese patent CN111945077A discloses a kind of ultra-high-strength engineering machinery steel Q890D and its production method, the steel plate Mo=0.50~0.60% involved is lower than the 0.61~0.71% of the present invention, does not contain V element, and influences steel plate welding cold simultaneously There is no special requirement for the As element in the crack, and the steel plate cannot be welded with heat input of 31-40kJ / cm in the process of continuous welding heat cycle
During the continuous welding heat cycle of the steel plate, the welding heat input is 7-13kJ / cm, and the welding efficiency is low

Method used

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  • Mo-V synergistic easy-to-weld steel plate with tensile strength of 1,000 MPa and production method thereof
  • Mo-V synergistic easy-to-weld steel plate with tensile strength of 1,000 MPa and production method thereof
  • Mo-V synergistic easy-to-weld steel plate with tensile strength of 1,000 MPa and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] This embodiment provides a Q890D easy-to-weld steel plate with a Mo-V synergistic tensile strength of 1000MPa, wherein the chemical composition mass percentage content of the steel is: C 0.09%, Si 0.22%, Mn 1.30%, Cr 0.35%, Mo0 .66%, V 0.065%, Ni 0.40%, Nb 0.35%, Ti 0.02%, P 0.008%, S 0.001%, B0.0009%, Al 0.015%, As 0.0035%, the rest is Fe and unavoidable inclusions thing. The thickness specification of the easy-to-weld steel plate is 16mm.

[0056] The production method of the above-mentioned Mo-V synergistic tensile strength 1000MPa easy-to-weld steel plate includes the following processes: smelting, casting, slab heating, rolling (including rough rolling and finish rolling), heat treatment (including quenching and tempering) and welding ,specifically,

[0057] Smelting includes: molten iron desulfurization, primary smelting, refining and vacuum degassing treatment; the molten iron containing various elements is desulfurized first, then sent to the converter for pri...

Embodiment 2

[0065] A Q890D easy-to-weld steel plate with a Mo-V synergistic tensile strength of 1000MPa, wherein the chemical composition of the steel is: C 0.10%, Si 0.25%, Mn 1.5%, Cr 0.40%, Mo 0.70%, V 0.059% , Ni0.35%, Nb 0.40%, Ti 0.020%, P 0.006%, S 0.002%, B 0.0012%, Al 0.025%, As0.004%, the balance is Fe and unavoidable inclusions. The thickness specification of the easy-to-weld steel plate is 30mm.

[0066] The production method of the above-mentioned Mo-V synergistic tensile strength 1000MPa easy-to-weld steel plate includes the following processes: smelting, casting, slab heating, rolling (including rough rolling and finish rolling), heat treatment (including quenching and tempering) and welding ,specifically,

[0067] Smelting includes: molten iron desulfurization, primary smelting, refining and vacuum degassing treatment; the molten iron containing various elements is desulfurized first, then sent to the converter for primary refining, and then sent to the LF refining furnac...

Embodiment 3

[0075] A Q890D easy-to-weld steel plate with a Mo-V synergistic tensile strength of 1000MPa, wherein the chemical composition of the steel is: C 0.11%, Si 0.21%, Mn 1.22%, Cr 0.41%, Mo 0.70%, V 0.068% , Ni0.45%, Nb 0.38%, Ti 0.018%, P 0.010%, S 0.003%, B 0.0009%, Al 0.030%, As0.0052%, the balance is Fe and unavoidable inclusions. The thickness specification of the easy-to-weld steel plate is 40mm.

[0076] The production method of the above-mentioned Mo-V synergistic tensile strength 1000MPa easy-to-weld steel plate includes the following processes: smelting, casting, slab heating, rolling (including rough rolling and finish rolling), heat treatment (including quenching and tempering) and welding ,specifically,

[0077] Smelting includes: molten iron desulfurization, primary smelting, refining and vacuum degassing treatment; the molten iron containing various elements is desulfurized first, then sent to the converter for primary refining, and then sent to the LF refining furn...

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Abstract

The invention relates to a Mo-V synergistic easy-to-weld steel plate with the tensile strength of 1,000 MPa and a production method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.09%-0.11% of C, 0.20%-0.29% of Si, 1.2%-1.5% of Mn, 0.20%-0.50% of Cr, 0.61%-0.71% of Mo, 0.050%-0.070% of V, 0.20%-0.50% of Ni, 0.020%-0.050% of Nb, 0.01%-0.025% of Ti, less than or equal to 0.011% of P, less than or equal to 0.003% of S, 0.0008%-0.002% of B, 0.01%-0.035% of Al, less than or equal to 0.006% of As and the balance Fe and inevitable inclusions. Efficient welding of 31-40 kJ / cm heat input can be achieved, and the service safety performance is guaranteed.

Description

technical field [0001] The invention belongs to the field of welding steel, and relates to a Mo-V synergistic easy-weld steel plate and a production method thereof, in particular to an Mo-V synergistic easy-weld steel plate with a tensile strength of 1000MPa and a production method thereof. Background technique [0002] With the development of construction machinery to high parameters, the strength level of structural steel is getting higher and higher, and ultra-high-strength steel with a tensile strength of 900MPa has gradually become a reduction trend. Since the martensitic ultra-high strength steel plate products with a tensile strength exceeding 900MPa have the characteristics of martensitic structure, the welding difficulty in the application process is becoming more and more difficult, and the technical requirements are getting higher and higher, especially the tensile strength is more than 1000MPa. Under the condition of welding heat input of 31kJ / cm, the joint perfo...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C21D1/18C21D8/02C22C33/04C21D6/00
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/06C22C38/002C21D8/0205C21D8/0221C21D8/0247C22C33/04C21D1/18C21D6/004C21D6/005C21D6/008
Inventor 麻衡王中学何康杜传治霍孝新王月香于全成李艳
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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