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High-strength molten zinc-plated steel sheet and process for production thereof

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in the direction of manufacturing tools, hot-dip coating process, heat treatment furnace, etc., can solve the problems of insufficient stretch flange formability, end face cracks, etc., and achieve excellent stretch flangeability, excellent Corrosion resistance, low YP effect

Active Publication Date: 2015-01-28
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the press forming of this part, the flange part is bent in order to join with the inner part, but if the ductility of the end surface of the blank after shearing or punching is called stretch flange formability Insufficient, there will be cracks on the end face

Method used

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  • High-strength molten zinc-plated steel sheet and process for production thereof
  • High-strength molten zinc-plated steel sheet and process for production thereof
  • High-strength molten zinc-plated steel sheet and process for production thereof

Examples

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Effect test

Embodiment

[0162] After the steels of the steel numbers A to AL shown in Table 1 and Table 2 were melted, they were continuously cast into billets with a thickness of 230 mm.

[0163]

[0164]

[0165] After heating this steel slab to 1180-1250 degreeC, it hot-rolls at the finish rolling temperature of the range of 820-900 degreeC. Then, it is cooled to 640° C. or less at an average cooling rate of 15 to 35° C. / sec, and coiled at a coiling temperature CT of 400 to 640° C. The obtained hot-rolled sheet was cold-rolled at a rolling reduction of 70 to 77% to obtain a cold-rolled sheet having a thickness of 0.8 mm.

[0166] In CGL, as shown in Table 3 and Table 4, the obtained cold-rolled sheet is heated so that the heating rate (average heating rate) in the temperature range of 680 to 750°C is 0.8 to 18°C / sec. Annealing was performed at AT for 40 seconds, and the average cooling rate from the annealing temperature AT to the coating bath temperature was the primary cooling rate shown ...

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PUM

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Abstract

A high-strength galvanized steel sheet having a low YP, good stretch flangeability, and excellent corrosion resistance and a method for manufacturing the same are provided. The steel sheet contains, on a percent by mass basis, more than 0.015% to less than 0.10% of C, 0.5% or less of Si, 1.0% to 1.9% of Mn, 0.015% to 0.050% of P, 0.03% or less of S, 0.01% to 0.5% of sol. Al, 0.005% or less of N, less than 0.40% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, and less than 0.020% of Ti, in which 2.2‰¤[Mneq]‰¤3.1 and [%Mn]+3.3[%Mo]‰¤1.9, and [%Mn]+3.3[%Mo]) / (1.3[%Cr]+8[%P]+150B*)<3.5 are satisfied. A steel has a microstructure consists of ferrite and second phases, the volume fraction of the second phase is 2% to 12%, and as the second phase, martensite having a volume fraction of 1% to 10% and retained ³ having a volume fraction of 0% to 5% are contained.

Description

technical field [0001] The present invention relates to a high-strength hot-dip galvanized steel sheet used in automobiles, home appliances, etc. through a press forming process, and a method for producing the same. Background technique [0002] TS: 340MPa grade BH steel plate (sinter hardened steel plate, hereinafter referred to as 340BH). 340BH is a single ferrite that controls the amount of solid-solution C by adding carbonitride-forming elements such as Nb and Ti to ultra-low carbon steel with C less than 0.01%, and uses Si, Mn, and P for solid-solution strengthening. phase steel. In recent years, the demand for lightweight car bodies has further increased, and research is being carried out: thinning the steel plate by making the outer plate of these 340BH applications further high-strength; reducing R / F (reinforcement: inner Reinforced parts); and reduce the temperature and shorten the time of the sintering coating process. [0003] However, if the existing 340BH is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C21D9/46C22C38/00C22C38/38C22C38/58C23C2/02C23C2/28
CPCC23C2/02C21D9/46C22C38/06C23C2/28C22C38/02C23C2/06C22C38/04C22C38/22C22C38/001C22C38/32C22C38/38C23C2/29C23C2/0224
Inventor 小野义彦高桥健二奥田金晴平章一郎樱井理孝伏胁祐介
Owner JFE STEEL CORP
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