Alloyed hot galvanizing bake hardening steel and method for manufacturing same

A baking hardening and manufacturing method technology, applied in the direction of manufacturing tools, metal rolling, hot-dip coating process, etc., can solve problems such as alloying stripes on the coating surface, affecting the surface quality of automobile outer panels, etc., to achieve balanced stamping performance, Platable and surface quality are good, and the effect of broad industrial application prospects

Active Publication Date: 2008-07-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of Ti element in the substrate in this patent, alloying stripe defects are likely to occur on the surface of the coating during the alloying annealing treatment of the coating, which affects the surface quality of the outer panel of the car

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] The following is an example illustration of the production of an alloyed hot-dip galvanized bake-hardening steel sheet according to the present invention.

[0046] The molten steel was vacuum degassed by RH refining, and a variety of measures to control inclusions were adopted. Finally, continuous casting slabs were produced by conventional continuous casting process. The chemical composition of molten steel is shown in Table 1.

[0047] Table 1 Actual chemical composition of the substrate, Wt%

[0048] Reality

Shi

example

C

Si

mn

P

S

N

Sol.Al

Ti

Nb

O

Fe

1

0.0015

0.030

0.60

0.050

0.010

0.0018

0.037

0

0.004

0.0038

margin

2

0.0020

0.021

0.55

0.052

0.008

0.0025

0.030

0

0.009

0...

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PUM

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Abstract

The invention relates to an alloyed hot-galvanized baking-hardened steel plate and the manufacturing method thereof, which solves the problems of the anti-pulverization of the galvanized layer, the surface quality and the baking-hardened value. The mass percentage for the chemical components of a baseplate is as follows: C 0.0015 to 0.0025 percent, Si less than or equal to 0.030 percent, Mn 0.50 to 0.60 percent, P 0.050 to 0.060 percent, S less than or equal to 0.015 percent, N less than or equal to 0.003 percent, sol.Al 0.030 to 0.055 percent, Nb 0.004 to 0.015 percent, O less than or equal to 0.0050 percent and the rest are Fe and unavoidable impurities. The weight of the galvanized layer (for a single side) is 30-60g/m2 and the mass percentage for the Fe component of the galvanized layer is 8 to 12 percent. The steel plate of the invention has excellent anti-pulverization performance of the galvanized layer, excellent surface quality and appropriate baking-hardened value.

Description

technical field [0001] The invention relates to an alloyed hot-dip galvanized bake-hardened steel sheet and a manufacturing method thereof, especially for automobile sheets and home appliance sheets. bake hardening value. Background technique [0002] In recent years, with the improvement of automobile safety performance requirements, the strength level of automobile plates has been continuously improved, and the use of high-strength steel plates can reduce the weight of the car body without losing the safety performance of the car, thereby reducing fuel consumption and environmental pollution. Therefore, more and more automotive panels use high-strength steel plates. However, automotive panels not only require high impact resistance, but also require excellent formability during stamping. Usually, as the strength level of the steel plate increases, the formability of the steel plate will gradually decrease, thus limiting the application of high-strength steel plates in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C33/04C21C7/10B21B37/74B21B5/00B21B37/48C21D8/02C21D1/26C21D9/46C21D11/00C23C2/06C23C2/26
Inventor 李俊张理扬林秀贞
Owner BAOSHAN IRON & STEEL CO LTD
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