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Cold rolling hot-dip galvanizing high-strength steel with extension strength being 1,000 MPa and preparation method of cold rolling hot-dip galvanizing high-strength steel

A technology of hot-dip galvanizing and tensile strength, applied in hot-dip galvanizing process, coating, metal material coating process, etc., to achieve good adhesion performance

Active Publication Date: 2018-08-24
MAGANG (GROUP) HOLDING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires the annealing furnace to have high heating capacity, rapid cooling after soaking and reheating capacity before plating, which cannot be achieved by conventional continuous hot-dip galvanizing annealing furnaces

Method used

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  • Cold rolling hot-dip galvanizing high-strength steel with extension strength being 1,000 MPa and preparation method of cold rolling hot-dip galvanizing high-strength steel
  • Cold rolling hot-dip galvanizing high-strength steel with extension strength being 1,000 MPa and preparation method of cold rolling hot-dip galvanizing high-strength steel
  • Cold rolling hot-dip galvanizing high-strength steel with extension strength being 1,000 MPa and preparation method of cold rolling hot-dip galvanizing high-strength steel

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preparation example Construction

[0044] The preparation method of the hot-dip galvanized high-strength steel with a tensile strength of 1000MPa comprises the following steps:

[0045] (1) Smelting process;

[0046] (2) Hot continuous rolling and coiling of cast slab or ingot: the cast slab is heated at 1200-1250°C, rolled by rough rolling mill for 5-7 passes, and rolled to a thickness of 30-60mm; The unit conducts 5-7 passes of rolling to a thickness specification of 2.2-4.5mm, the starting rolling temperature is 1000-1150°C, the final rolling temperature is 860-920°C, and the coiling temperature is 450-600°C;

[0047] (3) Hot-rolled coil cover removal: the hot-rolled coil cover removal temperature is 600-800°C, and the cover-removal time is 24-72h;

[0048] (4) Pickling and cold rolling: pickling the steel strip in a hydrochloric acid tank to remove the surface oxide scale, then performing cold continuous rolling or cold rolling, the acid rolling reduction rate is 45-60%, and rolling to the target thickness...

Embodiment 8

[0059] The metallographic structure photo of the hot-dip galvanized high-strength steel obtained in embodiment 8 is as follows figure 1 As shown, the scanning electron microscope photo is shown as figure 2 As shown, the zinc layer on the surface of the steel plate was corroded by 5% HCl solvent + corrosion inhibitor, and the morphology of the inhibition layer of the pure zinc coating was taken by scanning electron microscope, as shown in image 3 shown. from figure 1 and figure 2 It can be seen that the finished product structure is mainly ferrite and martensite, of which ferrite accounts for about 50%, martensite and / or bainite accounts for about 50%, and the hard phase martensite\and / or bainite uniformly distributed in ferrite; from image 3 It can be seen that when the pure zinc layer is eroded, the substrate surface is evenly distributed with "rice grain" inhibition layer particles (Fe-Al alloy phase), indicating that the inhibition layer on the substrate surface is...

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Abstract

The invention discloses a cold rolling hot-dip galvanizing high-strength steel with extension strength being 1,000 MPa and a preparation method of the cold rolling hot-dip galvanizing high-strength steel. The cold rolling hot-dip galvanizing high-strength steel with extension strength being 1,000 MPa comprises the following chemical components including, by mass percent, 0.06%-0.11% of C, 0.30%-0.50% of Si, 1.0%-3.0% of Mn, 0.2%-0.5% of Cr, 0.10%-0.30% of Mo, 0.03%-0.06% of Als, 0.015% or less of P, 0.004% or less of S, 0.005% or less of N, at least one of (a) 0.18% or less of Nb+Ti+V and (b)0.005% or less of B and the balance Fe and unavoidable impurities. By coordinating with reasonable steelmaking, continuous casting, hot rolling, cover retreating, acid rolling and continuous annealinghot-dip galvanizing process, the hot-dip galvanizing high-strength steel with the 1,000 MPa-level high elongation is obtained, the yield strength of the hot-dip galvanizing high-strength steel is 550MPa-700 MPa, the extension strength is larger than or equal to 980 MPa, the ductility A50 is larger than or equal to 14%, and good plating quality is achieved.

Description

technical field [0001] The invention belongs to the field of manufacturing cold-rolled hot-dip galvanized steel for automobiles, and in particular relates to a cold-rolled hot-dip galvanized high-strength steel with a tensile strength of 1000 MPa and a preparation method thereof. Background technique [0002] With the increasingly urgent demand for weight reduction and energy saving of automobiles and the continuous improvement of safety regulations, high-strength steel for automobiles has become an inevitable trend. With the continuous release of domestic automobile production capacity, DP steel, TRIP steel, QP steel, medium manganese steel and hot forming Competition in the high-strength steel market such as steel has also become increasingly fierce. At the same time, environmental protection, durability, etc. are also increasingly concerned, and the scope of application of coated steel sheets is gradually expanding. Among them, galvanized steel sheets have good corrosion ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/06C22C38/38C22C38/28C22C38/26C22C38/24C22C38/32C21D8/02C23C2/06C23C2/40
CPCC21D8/0226C21D8/0236C21D8/0247C21D2211/002C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C23C2/06C23C2/40
Inventor 马二清崔磊刘永刚詹华陈乐张宇光崔宇轩刘劼
Owner MAGANG (GROUP) HOLDING CO LTD
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