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Alloying molten zinc-plated steel sheet and manufacturing method therefor

A hot-dip galvanized steel sheet, hot-dip galvanized technology, applied in hot-dip galvanizing process, chemical instruments and methods, manufacturing tools, etc. The effect of excellent slab cracking resistance and excellent resistance to secondary processing embrittlement

Inactive Publication Date: 2018-04-17
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the alloyed hot-dip galvanized steel sheets produced by the production methods disclosed in Patent Documents 4 to 7, the above-mentioned slab cracking resistance and secondary working brittleness resistance may be low.

Method used

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  • Alloying molten zinc-plated steel sheet and manufacturing method therefor
  • Alloying molten zinc-plated steel sheet and manufacturing method therefor
  • Alloying molten zinc-plated steel sheet and manufacturing method therefor

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Embodiment

[0210] Molten steel having the chemical composition shown in Table 1 was produced, and the molten steel was cast to produce a slab.

[0211] [Table 1]

[0212]

[0213] With respect to the slabs of the respective steel numbers, hot-rolled steel sheets were produced at the finishing temperature FT (° C.) and the coiling temperature CT (° C.) shown in Table 2. The hot-rolled steel sheet was cold-rolled at a rolling ratio of 80% to manufacture a cold-rolled steel sheet. The cold-rolled steel sheets were annealed at the annealing temperatures (° C.) shown in Table 2 to manufacture base steel sheets. For base steel sheets of test numbers other than test numbers 49 and 50, after annealing and pickling treatment, Ni pre-plating treatment is performed to form a coating with a coating weight of 0.5g / m on the surface of the base steel sheet 2 Ni coating. Hot-dip galvanizing treatment is carried out on the base steel plate after Ni pre-plating treatment (set the Zn deposition amoun...

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Abstract

Provided is an alloying molten zinc-plated steel sheet with high strength and excellent deep drawability as well as excellent slab cracking resistance and secondary working embrittlement resistance. The base steel sheet for this alloying molten zinc-plated steel sheet contains, in mass%, C: 0.0080% or less, Si: 0.7% or less, Mn: 1.0-2.5%, P: greater than 0.030-0.048%, S: 0.025% or less, Al: 0.005-0.20%, N: 0.010% or less, Ti: 0.005-0.040%, Nb: 0.005-0.060%, and B: 0.0005-0.0030%, the balance being obtained from Fe and impurities, and has a chemical composition that satisfies expression (1) - expression (4). The alloying molten zinc-plating layer contains 7-15 mass% Fe. 25 * P + 4 * Si <= 3.6 (1) B X1 >= 0.0005 (2) C (12 / 93) * Nb X2 >= 0.0035 (3) 110 * Si + 48 * Mn + 550 * P >= 120 (4).

Description

technical field [0001] The present invention relates to a galvannealed steel sheet and a method for producing the same. More specifically, it relates to a galvannealed steel sheet having a high strength with a tensile strength of 440 MPa or higher and a method for producing the same. Background technique [0002] Recently, reduction in weight of automobiles has been demanded in order to reduce the emission of carbon dioxide gas and reduce fuel consumption. Furthermore, there is an increasing demand for improving the crash safety of automobiles. Increasing the strength of steel materials is effective in reducing the weight of automobiles and improving crash safety. [0003] Among automobile parts, panel parts are also required to have high press formability (deep drawability). Therefore, soft steel sheets with high workability have been used for conventional panel members. However, panel components are also required to increase in strength as described above. [0004] Pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14
CPCC21D9/46B32B15/013B32B15/015C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D8/0273C23C2/06C23C2/40C22C38/002C22C38/004C23C2/02C22C38/14C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C23C2/024C23C2/022C23C2/026C23C2/285C21D8/0426C21D8/0436C21D8/0473C23C2/0224Y10T428/12958B32B15/18B32B15/04B32B15/01C22C38/48B32B15/043Y10T428/12799Y10T428/12965C22C38/26B32B15/012Y10T428/12757Y10T428/12951C22C38/28C23C30/00C23C2/12C23C30/005C21D8/0263
Inventor 冈正春小嶋启达冈田哲也
Owner NIPPON STEEL CORP
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