High-strength galvanized steel sheet and method for manufacturing same

A technology of galvanized steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, hot-dip coating process, furnace, etc., and can solve the problems of difficult residual hydrogen and hydrogen embrittlement of blanks, etc.

Pending Publication Date: 2020-07-07
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when Zn, Ni, etc. are usually plated, it is difficult for hydrogen to escape or intrude from the material, so hydrogen in the steel called diffusible hydrogen is less likely to remain, and hydrogen embrittlement of the material is likely to occur.

Method used

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  • High-strength galvanized steel sheet and method for manufacturing same
  • High-strength galvanized steel sheet and method for manufacturing same
  • High-strength galvanized steel sheet and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] Molten steels having the compositions shown in Table 1 were melted in a converter and cast into slabs using a continuous casting machine. This slab was heated at 1200°C, and was produced into a hot-rolled coil at a finish rolling temperature of 840°C and a coil coiling temperature of 560°C. The hot-rolled coil was turned into a cold-rolled billet having a plate thickness of 1.4 mm at a cold reduction ratio of 50%. The cold-rolled billet is heated to 810°C (in the range of (Ac3 point-20°C) to 900°C) through annealing treatment with a hydrogen concentration of 9 vol.% and an annealing furnace atmosphere with a dew point of -30°C, stays for 15 seconds, and then cools To 500°C, stay for 30 seconds. Thereafter, galvanizing is carried out, alloying treatment is carried out, and after plating, it is cooled to below 100°C in a water tank with a water temperature of 40°C, and a high-strength alloyed galvanized steel sheet (product sheet) is produced at an average cooling rate o...

Embodiment 2

[0134] The molten steel with the composition shown in Table 2 was smelted in a converter, and after being made into a slab with a continuous casting machine, it was hot-rolled, cold-rolled, heated (annealed), pickled (Table 3) under various conditions shown in Table 3. In the case of "○" in 3, the HCl concentration of the pickling solution is adjusted to 5mass%, and the solution temperature is adjusted to 60°C for use), heat treatment and plating treatment, temper rolling, coil width trimming, post-heat treatment, Manufacture 1.4mm thick high-strength galvanized steel sheet (product sheet).

[0135] In addition, cooling (cooling after a plating process) was cooled to 50 degreeC or less with the water tank of 40 degreeC of water temperature.

[0136]

[0137] Take the sample of galvanized steel sheet obtained above, carry out structure observation and tensile test measurement according to the following methods, and calculate the fraction (area ratio) of metal structure, yiel...

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Abstract

Provided are a high-strength galvanized steel sheet and a method for manufacturing the same, the high-strength galvanized steel sheet being a high-demand material in which a high yield ratio is achieved, and having excellent plating appearance or hydrogen embrittlement resistance as a raw material, and a high yield ratio suitable for a building material or automobile collision resistance component. The present invention is a high-strength galvanized steel sheet having a specific component composition and a specific steel structure and being provided with a steel sheet in which the amount of diffusible hydrogen in the steel is 0.20 mass ppm or less, and a galvanization layer having a Fe content of 8-15% in terms of mass%, the amount of plating per side being 20-120 g / m<2>, on the surface ofthe steel sheet, the amount of Mn oxide included in the galvanization layer being 0.050 g / m<2> or less, the yield strength being 700 MPa or greater, and the yield strength ratio being 65% to less than 85%.

Description

technical field [0001] The present invention relates to a high-strength galvanized steel sheet suitable for building blanks and crash-resistant parts of automobiles, and a method for producing the same, which can easily suppress hydrogen embrittlement that tends to occur as the strength of steel increases. Background technique [0002] Nowadays, the improvement of the crash safety and fuel consumption of automobiles is strongly demanded, and the strengthening of steel plates used as parts materials is being developed. Among them, from the viewpoint of ensuring the safety of occupants in the event of an automobile collision, a high yield ratio (YR: YR=(YS / TS)×100(%)) is required for a material mainly used in a vehicle compartment. In addition, automobiles are widely used on a global scale, and automobiles are used in various applications in various regions and climates. Therefore, high rust resistance is required for steel sheets used as component materials. However, in gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60C23C2/06C22C18/00C22C18/02C21D9/46C22C38/06
CPCC22C38/04C22C38/02C22C38/06C21D1/26C21D1/74C22C38/14C22C38/12C22C38/08C22C38/16C22C38/38C22C38/32C22C38/60C22C38/008C22C38/28C22C38/26C22C38/24C22C38/20C22C38/22C22C38/58C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C21D2211/008C21D2211/005C21D2211/002C21D2211/001C23C2/0224C23C2/28C23C2/02C23C2/024C23C2/29C21D9/46C23C2/06C21D8/0226C21D8/0236C21D8/0242C21D8/0247C21D9/561C21D1/76C23C2/40C22C38/001C22C18/00C21D8/0273C22C38/18C23G1/00
Inventor 吉富裕美冲田泰明木庭正贵松田广志小野义彦
Owner JFE STEEL CORP
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