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High Mn steel sheet for high corrosion resistance and method of manufacturing galvanizing the steel sheet

A high-corrosion-resistant steel plate technology, applied in chemical instruments and methods, hot-dip plating process, coating, etc., can solve research problems and achieve excellent corrosion resistance

Inactive Publication Date: 2009-01-14
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, no research has been conducted on the optimum coating and hot-dip coating method for high corrosion resistance of high manganese steels containing about 5-35% by weight of Mn

Method used

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  • High Mn steel sheet for high corrosion resistance and method of manufacturing galvanizing the steel sheet
  • High Mn steel sheet for high corrosion resistance and method of manufacturing galvanizing the steel sheet

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Experimental program
Comparison scheme
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Embodiment approach

[0089] Hereinafter, the present invention is described in detail with reference to examples.

Embodiment

[0091] A plurality of billets having the compositions shown in Table 1 below were produced.

[0092] In Table 1, No. 1 to No. 11 steels are steels of the present invention, and have the element content ranges according to the present invention, while No. 12 to No. 15 steels are comparative steels, and do not have the element content ranges according to the present invention .

[0093]The billet is heated to a temperature of 1200° C., enabling hot rolling of the billet. Hot finish rolling of billet. The billets were coiled at 620°C and air cooled. HCl solution was used to remove oxides on the surface of each steel plate. The steel sheets were cold rolled at a reduction ratio of 70%. As a result, a cold-rolled steel sheet was obtained.

[0094] Subsequently, at N 2 -10%H 2 In the atmosphere, the cold-rolled steel sheet was annealed at 620-880°C for 90 seconds, and placed in a Zn-0.013% Al bath maintained at 460°C. As a result, a hot-dip galvanized layer was formed on the...

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Abstract

Disclosed herein are a high-manganese hot-dip coated steel sheet exhibiting high ductility and high strength, mainly used for inner and outer panels of automobiles, and a method of manufacturing the same. The high-manganese hot-dip coated steel sheet includes a substrate steel sheet having a composition of (in weight %) 0.1 to 1.5 % of C, 5 to 35 % of Mn, and the remainder including Fe and other unavoidable impurities, and a hot-dip zinc coating layer formed on the substrate steel sheet, the hot-dip zinc coating layer containing only Zn, or an alloying hot-dip coating layer formed on the substrate steel sheet, the alloying hot-dip coating layer having a composition of (in weight %) 0.1 to 10 % of Mn, 5 to 15 % of Fe, and the remainder including Zn and other unavoidable impurities. Consequently, the hot-dip coated steel sheet according to the present invention exhibits high corrosion resistance as well as high strength and high ductility.

Description

technical field [0001] The present invention relates to a high-manganese hot-dip-coated steel sheet mainly used in automobiles and a manufacturing method thereof, more particularly, to a high-manganese hot-dip-coated steel sheet having high corrosion resistance and high processability and a manufacturing method thereof , and high ductility and high strength. Background technique [0002] Recently, regulations on vehicle exhaust have been tightened due to the depletion of fossil fuels and related environmental concerns. As a result, attention has been paid to improving automobile fuel efficiency by reducing vehicle body weight. [0003] Various high-strength steel plates have been developed to achieve weight reduction of the vehicle body. However, as the strength of the steel plate increases, the ductility of the steel plate decreases. Therefore, the use of such steel sheets to form automotive parts has been limited. [0004] A lot of research has been carried out, epoch-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06
CPCY10T428/12799C23C2/28C22C18/00C21D8/0236B32B15/012C22C38/60C21D8/0273C21D6/005C22C38/04C23C2/06C21D8/0284
Inventor 孙一领陈光根金成柱金明守金成圭
Owner POHANG IRON & STEEL CO LTD
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