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High-strength weathering resistant steel and its preparation method

A weather-resistant steel and high-strength technology, which is applied in the field of high-strength weather-resistant steel and its preparation, can solve the problems of high tensile strength, high toughness, low yield strength, reduced low-temperature impact toughness, and reduced mechanical properties of steel, so as to improve processing performance and improve Strength, the effect of overcoming copper embrittlement and phosphorus embrittlement

Active Publication Date: 2013-09-25
JIANGYIN ZHENGBANG TUBE MAKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Compared with ordinary steel, weathering steel has excellent corrosion resistance. According to the application, it is mainly divided into weathering steel for containers, weathering steel for railways, weathering steel for construction, etc., and is mainly divided into copper-phosphorus weathering steel, copper-phosphorus- X (X is one or more of Cr, Ni, Ti, V, RE), copper and phosphorus are the main alloying elements for the earliest development of weather-resistant steel, and appropriate copper and phosphorus can improve the weather resistance of steel. Significantly; however, higher copper and phosphorus content will reduce the mechanical properties of steel, such as copper enrichment in steel will easily cause copper embrittlement, which will reduce the strength of steel, and the enrichment and segregation of phosphorus in steel will reduce Low-temperature impact toughness of steel; and the current weathering steel, including weathering steel for railways, weathering steel for construction and weathering steel for containers, all need to improve strength and impact toughness. Therefore, it is necessary to reduce the content of copper and phosphorus in weathering steel, and develop Low-copper, low-phosphorus series weathering steel; China Invention Patent Application No. 2004100967957 discloses "high tensile strength, high toughness, low yield ratio bainitic steel and its production method", which improves the strength by reducing the Cu and P content in the steel And add Cr, Ni, Mn alloy elements to improve the weather resistance of steel, to compensate for the impact of Cu, P content reduction on weather resistance; The carbon content and the addition of Cr, Ni, Mo, Nb and other components improve the weather resistance and strength toughness, but the treatment method of quenching + tempering after rolling is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Using low-sulfur blast furnace molten iron as raw material, the molten iron is subjected to KR desulfurization treatment, and the sulfur content in the molten iron is reduced from 0.03% to 0.003%. It is smelted in a 100-ton converter, and the amount of scrap added is 10%. The composition quality at the end of blowing is: C 0.05%, P 0.001%, S 0.008%, the tapping temperature of the converter is 1640℃, and the molten steel in the ladle is about 30 tons, add ferrosilicon, ferromanganese, and ferroaluminum to the ladle for pre-deoxidation and silicon-manganese-aluminium alloying. Add 300kg of lime into the ladle to improve the basicity of the ladle slag for sulfur recovery control. After tapping, the components are sampled in the ladle for analysis: C 0.05%, Si 0.40%%, Mn 0.9%, Al 0.055%; during the tapping process, the ladle is blown with argon , when the molten steel volume in the ladle is less than 50 tons, the argon blowing pressure used is 0.6MPa. When the tapping volume...

Embodiment 2

[0038] Using low-sulfur blast furnace molten iron as raw material, the molten iron is subjected to KR desulfurization treatment, and the sulfur content in the molten iron is reduced from 0.028% to 0.003%. It is smelted by a 100-ton converter, and the amount of scrap added is 12%. The composition quality at the end of the blowing process is: C 0.04%, P 0.001%, S 0.008%, the tapping temperature of the converter is 1648°C, and the molten steel in the ladle is about 30 tons, add ferrosilicon, ferromanganese, and ferroaluminum to the ladle for pre-deoxidation and silicon-manganese-aluminium alloying. Add 300kg of lime into the ladle to improve the basicity of the ladle slag to control the sulfur return. After tapping, the components are sampled in the ladle and analyzed as follows: C 0.04%, Si 0.38%, Mn 0.8%, Al 0.055%; during the tapping process, the ladle is blown with argon , when the molten steel volume in the ladle is less than 50 tons, the argon blowing pressure used is 0.6MPa...

Embodiment 3

[0041] Using low-sulfur blast furnace molten iron as raw material, the molten iron is subjected to KR desulfurization treatment, and the sulfur content in the molten iron is reduced from 0.03% to 0.003%. It is smelted by a 100-ton converter, and the amount of scrap added is 12%. The composition quality at the end of the blowing process is: C 0.06%, P 0.001%, S 0.008%, the tapping temperature of the converter is 1648°C, and the molten steel in the ladle is about 30 tons, add ferrosilicon, ferromanganese, and ferroaluminum to the ladle for pre-deoxidation and silicon-manganese-aluminium alloying. Add 300kg of lime into the ladle to improve the basicity of the ladle slag for sulfur recovery control. After tapping, the components are sampled in the ladle for analysis: C 0.06%, Si 0.45%%, Mn 1.0%, Al 0.065%; during the tapping process, the ladle is blown with argon , when the molten steel volume in the ladle is less than 50 tons, the argon blowing pressure used is 0.6MPa. When the t...

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Abstract

The invention provides high-strength weathering resistant steel and its preparation method. The high-strength weathering resistant steel is characterized by comprising the following chemical components: by weight, C being less than or equals to 0.06% and greater than or equals to 0.05%, Cu being less than or equals to 0.35% and greater than or equals to 0.25%, Si being less than or equals to 0.45% and greater than or equals to 0.36%, Mn being less than or equals to 1.00% and greater than or equals to 0.80%, Al being less than or equals to 0.065% and greater than or equals to 0.055%, Ni being less than or equals to 0.19% and greater than or equals to 0.10%, Cr being less than or equals to 0.50% and greater than or equals to 0.41%, Mo being less than or equals to 0.15% and greater than or equals to 0.05%, Ti being less than or equals to 0.02% and greater than or equals to 0.01%, V being less than or equals to 0.030% and greater than or equals to 0.016%, Nb being less than or equals to 0.010% and greater than or equals to 0.005%, B being less than or equals to 0.008% and greater than or equals to 0.005%, S being less than or equals to 0.010%, P being less than or equals to 0.025%, N being less than or equals to 0.005%, and the balance being Fe. According to the invention, a plurality of microalloy elements such as Al, Mo, V, Nb, B and the like are added into components of traditional weathering resistant steel so as to carry out combination alloying. Thus, contents of Cu and P in weathering resistant steel are reduced, copper brittleness and phosphorus brittleness hazards caused by Cu and P in weathering resistant steel are eliminated, and strength and weatherability of the steel are raised.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a high-strength weathering steel and a preparation method thereof. Background technique [0002] Compared with ordinary steel, weathering steel has excellent corrosion resistance. According to the application, it is mainly divided into weathering steel for containers, weathering steel for railways, weathering steel for construction, etc., and is mainly divided into copper-phosphorus weathering steel, copper-phosphorus- X (X is one or more of Cr, Ni, Ti, V, RE), copper and phosphorus are the main alloying elements for the earliest development of weather-resistant steel, and appropriate copper and phosphorus can improve the weather resistance of steel. Significantly; however, higher copper and phosphorus content will reduce the mechanical properties of steel, such as copper enrichment in steel will easily cause copper embrittlement, which will reduce the strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21D8/00
Inventor 王宏明李桂荣
Owner JIANGYIN ZHENGBANG TUBE MAKING
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