Hot galvanizing high-strength steel with tension strength grade of 800MPa and reduction production method thereof

A technology of tensile strength and production method, applied in hot dipping process, coating, metal material coating process, etc., can solve the problems of rolling edge cracks, increased waste discharge, rolling difficulties, etc., and achieve good forming Performance and welding performance, energy consumption and CO2 emission reduction, good surface quality effect

Active Publication Date: 2018-11-16
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current manufacturing process of hot-dip galvanized high-strength steel products with a tensile strength of 800 MPa generally involves steelmaking→continuous casting→hot rolling→pickling→cold rolling→annealing and galvanizing, etc. The manufacturing process is relatively long, resulting in ene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a hot-dip galvanized high-strength steel with a tensile strength of 800 MPa, which is produced according to the following steps: smelting, continuous casting → heating or soaking → 3 passes of rough rolling → 5 passes of finish rolling → cooling → coiling → pickling → continuous stripping → galvanizing → finishing → finished product.

[0043] Using converter, LF refining, RH vacuum smelting, the steel composition is controlled to be 0.04%C, 0.02%Si, 1.6%Mn, 0.15%V, 0.023%Als, 0.15%Mo, 0.002%P, 0.002%S, 0.003%N, 0.02% Ti, 0.0020% B, the cast slab is continuously cast, the thickness of the cast slab is 80mm, the cast slab is heated to 1200°C, and then rough rolled three times to obtain a 12mm intermediate slab, the rough rolling finish rolling temperature is 1000 ℃, rough rolling reduction rate, 85%, and then 5 passes of finish rolling, finish rolling temperature 900 ℃, product thickness 1.5mm, finish rolling reduction rate 87.5%, rapid cooling af...

Embodiment 2

[0046] This embodiment provides a hot-dip galvanized high-strength steel with a tensile strength of 800 MPa, which is produced according to the following steps: smelting, continuous casting → 3 passes of rough rolling → heating or soaking → 5 passes of finish rolling → cooling → coiling → pickling → continuous stripping → galvanizing → finishing → finished product.

[0047] Using converter, LF refining, RH vacuum smelting, the steel composition is controlled as 0.06%C, 0.08%Si, 2.0%Mn, 0.20%V, 0.05%Als, 0.002%P, 0.002%S, 0.003%N, 0.02%Ti, 0.003% B, the cast slab is continuously cast, the thickness of the cast slab is 100mm, and the cast slab is rough rolled three times to obtain a 12mm intermediate slab, the rough rolling reduction is 88%, and the rough rolling finish rolling temperature is 1050°C. Then heat to 1100°C, and then carry out 5 passes of finish rolling, finish rolling temperature 860°C, product thickness 1.2mm, rough rolling reduction rate 90%, rapid cooling after ...

Embodiment 3

[0050] This example provides a hot-dip galvanized high-strength steel with a tensile strength of 800 MPa, which is produced specifically according to the following steps: smelting, continuous casting → heating or soaking → 7 passes of finishing rolling → cooling → coiling → pickling → continuous annealing →galvanizing→finishing→finished product.

[0051] Using converter, LF refining, RH vacuum smelting, the steel composition is controlled to be 0.08%C, 0.01%Si, 2.2%Mn, 0.25%V, 0.010Nb%, 0.02%Als, 0.002%P, 0.002%S, 0.20%Cr, 0.002% N, 0.0025% B, the cast slab is continuously cast, the thickness of the cast slab is 56mm, the cast slab is heated, the furnace temperature is 1220°C, and then 7 passes of finish rolling are carried out, and the finish rolling temperature is 850°C to obtain 1.0 mm finished product, finishing rolling reduction rate 98.2%, rapid cooling after finishing rolling, average cooling rate above 600°C 50°C / s, coiling temperature 400°C, pickling the hot-rolled st...

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Abstract

The invention relates to hot galvanizing high-strength steel with the tension strength grade of 800MPa and a reduction production method thereof. The hot galvanizing high-strength steel is prepared from the following components: 0.03 to 0.10 percent of C, 1.50 to 2.50 percent of Mn, 0.005 to 0.10 percent of Si, 0.005 to 0.05 percent of Als, 0.10 to 0.25 percent of V, smaller than or equal to 0.015percent of P, smaller than or equal to 0.010 percent of S, smaller than or equal to 0.008 percent of N and 0.0005 to 0.0050 percent of B, and a product microstructure is mainly prepared from 88 to 94percent of ferrite, 3 to 10 percent of bainite and 0 to 9 percent of martensite structure. The production method of the hot galvanizing high-strength steel comprises the following steps: steelmaking,refining, continuous casting and hot rolling, acid pickling, annealing and galvanizing, and finishing. A cold rolling procedure of a traditional production technological process is omitted, the production process is remarkably shortened, the energy consumption and the CO2 emission during the production process are greatly reduced, and the production efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized ultra-high-strength steel manufacturing, and relates to a hot-dip galvanized high-strength steel with a tensile strength of 800 MPa and a reduction production method thereof. Background technique [0002] In recent years, in order to reduce energy consumption during the use of automobiles and reduce CO 2 Emissions, automotive steel, etc. are developing in the direction of thinner thickness specifications and higher strength, and ultra-high-strength steel of 800MPa level and above is one of the main development directions. Compared with ordinary cold-rolled high-strength steel, galvanized high-strength steel not only has high strength, but also has good corrosion resistance. Therefore, galvanized ultra-high-strength steel above 800MPa has been widely used, mainly for door anti-collision beams, longitudinal Manufacture of automotive structural parts such as beam reinforcement plates and ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C33/04C21D8/02C23C2/06C23C2/40
CPCC21D8/0205C21D2211/002C21D2211/005C21D2211/008C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C23C2/06C23C2/40
Inventor 谭文潘利波王俊霖祝洪川方芳陈一鸣周文强杜小峰
Owner 武汉钢铁有限公司
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