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Preparation method of welding steel plate with large energy input

A technology for large line energy welding and steel plate, applied in the field of iron and steel metallurgy, can solve problems such as difficulty in meeting the requirements of high-strength steel ultra-large line energy welding performance, improve welding efficiency and construction progress, huge direct and indirect economic benefits, excellent mechanics Effects of performance and welding performance

Inactive Publication Date: 2014-05-14
无锡市锡山区鹅湖镇荡口青荡金属制品厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the welding heat input that the steel plate can withstand is only 100kJ / cm, which is still difficult to meet the industrial requirements for the ultra-large heat input welding performance of high-strength steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a high heat input welded steel plate, the steel plate is composed of the following components in weight percentage: C: 0.12, Mn: 1.6, Si: 0.8, Ni: 1.7, Cr: 0.4, V: 0.03, Ti: 0.05, P≤0.020, S≤0.015, O: 0.005, Als: 0.005, Ca: 0.025, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: desulfurization treatment of molten steel, converter or electric furnace smelting, ladle furnace Or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferrovanadium, ferronickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochrome and calcium wire are added during the refining period to make the steel The chemical composition meets the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the mold during continuous casting is controlled at 1530°C, and the rolled plate incl...

Embodiment 2

[0021] A method for preparing a high heat input welded steel plate, the steel plate is composed of the following components in weight percentage: C: 0.16, Mn: 1.2, Si: 1.0, Ni: 1.5, Cr: 0.6, V: 0.01, Ti: 0.15, P≤0.020, S≤0.015, O: 0.001, Als: 0.025, Ca: 0.005, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: desulfurization treatment of molten steel, converter or electric furnace smelting, ladle furnace Or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferrovanadium, ferronickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochrome and calcium wire are added during the refining period to make the steel The chemical composition meets the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the mold during continuous casting is controlled at 1550°C, and the rolled plate incl...

Embodiment 3

[0023] A method for preparing a high heat input welded steel plate, the steel plate is composed of the following components in weight percentage: C: 0.14, Mn: 1.4, Si: 0.9, Ni: 1.6, Cr: 0.5, V: 0.02, Ti: 0.10, P≤0.020, S≤0.015, O: 0.003, Als: 0.015, Ca: 0.015, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: desulfurization treatment of molten steel, converter or electric furnace smelting, ladle furnace Or ladle argon blowing refining, continuous casting, rolling into plates, wherein during converter or electric furnace smelting, ferro-vanadium, ferronickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochrome and calcium wire are added during the refining period to make the steel The chemical composition meets the composition requirements of the steel plate, wherein the temperature of the molten steel entering the mold during continuous casting is controlled at 1540°C, and the rolled plate includ...

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PUM

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Abstract

The invention discloses a preparation method of a welding steel plate with large energy input. The steel plate comprises C, Mn, Si, Ni, Cr, V, Ti, P, S, O, Als, Ca and Fe. The preparation method comprises following steps of: desulfurizing molten steel, smelting in a converter or an electric furnace, blowing bottom argon to a steel ladle or a ladle furnace to perform refining, performing continuous casting and rolling to obtain a plate, wherein ferrovanadium, ferronickel and ferrotitanium are added together with waste steel at first during the smelting step in the converter or the electric furnace; ferrochromium and calcium wires are added during the refining step so that chemical components in the steel satisfy requirements of components of the steel plate; the temperature of the molten steel added into a crystallizer during the continuous casting step is controlled to be 1530-1550 DEG C; and in the rolling step, the starting rolling temperature is 1200-1220 DEG C, the accumulated reduction rate of last three controlled rolling steps is not less than 42%, and the finish rolling temperature is 880-900 DEG C.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a large input energy welded steel plate. Background technique [0002] With the development of the national economy and the acceleration of national infrastructure construction, steel structures in various fields are becoming larger and larger. In order to further improve welding efficiency, greatly reduce the labor intensity and production costs of steel structure welding, the strength of steel plates for making large steel structures The requirements for toughness and welding line energy that the steel plate can withstand are gradually increasing. Therefore, technicians have made various improvements to the composition and production methods of the steel plate in order to achieve better performance, but there are still various deficiencies. [0003] For example, in the production process of Japanese patent JP20070158284 and Chinese paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/58C22C33/04C21D8/02
Inventor 钱永清
Owner 无锡市锡山区鹅湖镇荡口青荡金属制品厂
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