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High-strength galvanized steel sheet, high-strength member, and manufacturing methods therefor

A technology of galvanized steel sheet and manufacturing method, applied in manufacturing tools, hot-dip plating process, coating, etc., to achieve the effects of excellent strength-ductility, good surface properties, and excellent resistance to hydrogen embrittlement

Pending Publication Date: 2020-11-13
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is a concern that hydrogen embrittlement will occur with the increase in the strength of steel sheets

Method used

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  • High-strength galvanized steel sheet, high-strength member, and manufacturing methods therefor
  • High-strength galvanized steel sheet, high-strength member, and manufacturing methods therefor
  • High-strength galvanized steel sheet, high-strength member, and manufacturing methods therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0146]Molten steel having the component composition of steel A shown in Table 1 was melted in a converter, and a billet was formed by a continuous casting machine. This billet was heated to 1200°C, and a hot-rolled steel coil was formed at a finish rolling temperature of 840°C and a coiling temperature of 550°C. This hot-rolled steel coil was formed into a cold-rolled steel sheet having a cold reduction ratio of 50% and a sheet thickness of 1.4 mm. The cold-rolled steel sheet was heated to 810°C ((A c3 point -10°C) to 900°C), stay for 60 seconds, cool to 500°C, and stay for 100 seconds. Afterwards, galvanizing is carried out to perform alloying treatment, and after plating, it passes through a water bath at a water temperature of 40°C, thereby cooling at a cooling stop temperature of 100°C or lower and an average cooling rate of 3°C / s or higher to produce high-strength steel. Galvanized steel sheet (product sheet). Skin temper rolling was performed after plating, and the el...

Embodiment 2

[0157] Melt molten steel with the composition of steels A to N shown in Table 1 in a converter, use a continuous casting machine to form a billet, heat it to 1200°C, and then carry out hot rolling. The finishing temperature is 910°C, and the coiling temperature is 560°C Form hot-rolled steel coils. Thereafter, a cold-rolled steel coil having a cold reduction rate of 50% and a thickness of 1.4 mm was formed. It was subjected to heating (annealing), pickling (pickling using a pickling solution whose HCl concentration was adjusted to 5 mass%, and the liquid temperature was adjusted to 60° C.), and plating treatment under the various conditions shown in Table 2. , temper rolling, width trimming, and post-heat treatment to manufacture 1.4mm thick high-strength galvanized steel sheets (product sheets). Moreover, it cooled to 100 degreeC or less by passing through the water tank of 50 degreeC of water temperature during cooling (cooling after plating process). In addition, in the p...

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Abstract

The present invention addresses the problem of providing, with regard to a high-strength galvanized steel sheet for which hydrogen embrittlement is a concern, a high-strength galvanized steel sheet which has excellent plating appearance and the material of which has excellent hydrogen embrittlement resistance, and a high yield strength suitable for impact-resistant parts of construction materialsand automobiles, and providing a high-strength member, and manufacturing methods therefor. This high-strength galvanized steel sheet comprises: a steel sheet having a prescribed component compositionand a steel structure containing 4-20% residual austenite, 30% or less (including 0%) ferrite, 40% or greater martensite, and 10-50% bainite, and a zinc plating layer on the steel sheet. The amount ofdiffusible hydrogen in the steel is less than 0.20 mass pmm, and the tensile strength is 1100 MPa or greater. The relationship between the tensile strength TS (MPa), the elongation El (%), and the sheet thickness t (mm) satisfies formula (1), and the yield ratio YR is 67% or greater. TS*(El+3-2.5t)>= 13000 (1)

Description

technical field [0001] The present invention relates to a high-strength galvanized steel sheet, a high-strength galvanized steel sheet, a high-strength component, which is excellent in elongation (El), which is easy to deteriorate when the strength is high, and hydrogen embrittlement resistance, and which is suitable for building materials, automobile frames, and crash-resistant parts, and their production method. Background technique [0002] Nowadays, the improvement of the collision safety of automobiles and the improvement of fuel economy are strongly demanded, and the strength of steel plates used as component slabs is being increased. Among them, from the viewpoint of ensuring the safety of occupants in the event of an automobile collision, not only high tensile strength but also high yield strength are required for component slabs used around the vehicle compartment. And in order to reflect aesthetics, in addition to strength, ductility of the slab is also important....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/06C22C38/60C23C2/06C23C2/40C22C18/00C22C18/04
CPCC22C38/02C22C38/04C22C38/06C22C38/001C22C38/12C22C38/14C22C38/16C22C38/002C22C38/008C22C38/60C22C38/34C22C38/38C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/20C22C38/58C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C21D8/0205C21D8/0236C21D8/0226C21D8/0247C21D8/0278C21D1/26C21D1/74C23C2/06C23C2/40C23C2/28C22C18/00C22C18/04C21D2211/008C21D2211/005C21D2211/001C21D2211/002C23C2/26C23C2/261C22C38/00C21D9/46C23G1/08C21D8/0405C21D8/0436C21D8/0447C21D1/76C21D9/48C21D1/20C21D6/005
Inventor 吉富裕美小野义彦中垣内达也
Owner JFE STEEL CORP
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