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High-strength steel plate and method for producing the same

A high-strength steel plate and steel plate technology, which is applied in the field of high-strength steel plate for construction machinery and its preparation, can solve the problem that the processing thickness of the steel plate cannot be broken through, and achieve the effects of excellent comprehensive performance, broad application prospects, and high yield strength

Inactive Publication Date: 2009-06-10
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the field of large-thickness quenched and tempered high-strength steel, the requirements for the strength level of steel have been continuously increasing, gradually increasing from 50Kg and 60Kg to 100Kg and 110Kg, especially the 110Kg level of high-strength steel. There are many unsatisfactory places, for example, the processing thickness of the steel plate cannot exceed 50mm at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] High-strength steel plate, thickness 80mm, its chemical composition is: C 0.16%, Si 0.35%, Mn 1.10%, P 0.010%, S 0.003%, Ni0.85%, V 0.053%, Nb 0.029%, Al 0.040%, Cr 0.40%, Mo 0.59%, Ti 0.018%, B 0.0026%, and the rest are iron and unavoidable impurities. The carbon equivalent is 0.60%, and its mechanical properties: yield strength 990MPa, tensile strength: 1050Mpa; -20°C impact energy AKV (longitudinal) 60, 58, 49J, -40°C impact energy AKV (longitudinal) 36, 39, 40J; Cold bending d=3a.

[0047] Prepare as follows:

[0048] (1) Smelting process: The molten steel containing the above-mentioned chemical components in various weight percentages is first smelted in a 90-ton UHP electric furnace, then sent to an LF refining furnace for refining, and fed to an Al wire of 500 meters. The refining process ensures that the refining slag is white, so as to ensure Deoxidation effect: after the refining is completed, vacuum treatment is carried out in the hanging bag VD furnace, an...

Embodiment 2

[0056] High-strength steel plate, thickness 12mm, its chemical composition is: C 0.15%, Si 0.30%, Mn 1.05%, P 0.008%, S 0.004%, Ni 0.80%, V 0.055%, Nb 0.025%, Al 0.035%, Cr 0.38%, Mo 0.55%, Ti 0.015%, B 0.0022%, and the rest are iron and unavoidable impurities. The carbon equivalent is 0.58%, and its mechanical properties: yield strength 975MPa, tensile strength: 1040Mpa; -20°C impact energy AKV (longitudinal) 100, 89, 79J, -40°C impact energy AKV (longitudinal) 40, 50, 54J; Cold bending d=3a is good. 12mm thick steel plate welding does not require preheating, and the welding performance is good.

[0057] Prepare as follows:

[0058] (1) Smelting process: first smelt the molten steel containing the chemical components of the above weight percentages in a 90-ton UHP electric furnace, then send it to the LF refining furnace for refining, and feed 450 meters of Al wire. The refining process ensures that the refining slag is white to ensure Deoxidation effect: after the refinin...

Embodiment 3

[0066] High-strength steel plate, thickness 20mm, its chemical composition is: C 0.17%, Si 0.25%, Mn 1.10%, P 0.012%, S 0.003%, Ni 0.87%, V 0.049%, Nb 0.027%, Al 0.040%, Cr 0.35%, Mo 0.57%, Ti 0.018%, B 0.0028%, and the rest are iron and unavoidable impurities. The carbon equivalent is 0.59%, its mechanical properties: yield strength 990MPa, tensile strength: 1070Mpa; -20°C impact energy AKV (longitudinal) 70, 69, 80J, -40°C impact energy AKV (longitudinal) 35, 40, 45J; Cold bending d=3a, good.

[0067] Prepare as follows:

[0068] (1) Smelting process: first smelt the molten steel containing the chemical components of the above weight percentages in a 90-ton UHP electric furnace, then send it to the LF refining furnace for refining, and feed 470 meters of Al wire. The refining process ensures that the refining slag is white to ensure Deoxidation effect: after the refining is completed, vacuum treatment is carried out in the hanging bag VD furnace, and 90kg of SiCa blocks ar...

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Abstract

The invention relates to a 110Kg level high tensile steel plate with the yield strength not less than 960MPa. The steel plate comprises the following chemical components by weight percentage: 0.14 to 0.18 percent of C, 0.20 to 0.50 percent of Si, 0.90 to 1.30 of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.70 to 0.10 percent of Ni, 0.04 to 0.08 percent of V, 0.020 to 0.060 percent of Nb, 0.020 to 0.060 percent of Al, 0.30 to 0.80 percent of Cr, 0.30 to 0.60 percent of Mo, 0.010 to 0.030 percent of Ti, 0.0010 to 0.0030 percent of B, and the balance being Fe and inevitable impurities. Through the reasonable design of alloy components and mainly the control on quenching and tempering process, the thickness of the obtained steel plate can reach 80mm. The steel plate has high yield strength, high welding performance, high cold bending performance, good low temperature toughness, good steel plate profile, and excellent comprehensive performance. The steel plate can be widely applied to the manufacturing of engineering machinery and has bright application prospect.

Description

(1) Technical field [0001] The invention relates to a high-strength steel plate for engineering machinery and a preparation method thereof, in particular to a high-strength steel plate for engineering machinery with a yield strength of 110kg not lower than 960Mpa. (2) Background technology [0002] With the development of national economic construction, the market demand for quenched and tempered high-strength steel with high yield strength such as 590MPa and above is increasing, especially for the mechanical properties and welding properties of steel in coal mining machinery, engineering machinery, hydropower, bridges and other industries High demands were made. [0003] In the field of large-thickness quenched and tempered high-strength steel, the requirements for the strength level of steel have been continuously increasing, gradually increasing from 50Kg and 60Kg to 100Kg and 110Kg, especially the 110Kg level of high-strength steel. There are many unsatisfactory places,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C33/04C21C7/00C21D8/02C21D1/18C21D7/06
Inventor 谢良法郭桐韦明刘生吕建会侯彩霞刘利香
Owner WUYANG IRON & STEEL
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