High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof

A production method and specific heat technology, applied in the direction of hot-dip plating process, coating, metal material coating process, etc., can solve the problems of limited load-carrying capacity, poor fatigue resistance, and increased cost of trucks, so as to reduce yield Strength, increase elongation, eliminate residual stress effect

Inactive Publication Date: 2014-09-17
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, many automobile factories use ordinary cold-rolled sheets St13 and St14 for supporting plates and reinforcing plate parts of series trucks, and usually rely on increasing plate thickness to improve strength. This method has great limitations. , which not only increases a lot of cost, but also produces a limited load-carrying capacity of the passenger car, and has poor fatigue resistance
[0003] In recent years, with the continuous development of sheet metal forming technology in today's society, steel plates with high yield ratio are a new type of product applied to the production of plates and strips for passenger vehicles. Because of their unique excellent surface quality and suitable thickness tolerance , good processing performance, and gradually become an ideal choice to replace some ordinary cold-rolled sheets, but there is no production method for hot-dip galvanized micro-carbon aluminum-killed steel sheets with high yield strength that can be applied to trucks in the prior art literature

Method used

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  • High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof
  • High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The flow process of the production method of the high yield strength hot-dip galvanized micro-carbon aluminum killed steel plate provided by the invention is:

[0041] According to the design of steel composition, C: 0.01~0.04%, Si≤0.03%, Mn: 0.23%, P≤0.013%, S≤0.010%, Als: 0.023%, N≤0.005%, B: 0.001~0.008% , the balance is Fe and unavoidable impurities, using molten iron desulfurization, converter blowing, RH vacuum refining, continuous casting to obtain continuous casting slabs.

[0042] The continuous casting slab is heated by a heating furnace, rolled on a continuous hot rolling mill, cooled under control, and then coiled. The coiling temperature after hot rolling is controlled at 716°C to produce qualified hot-rolled steel coils.

[0043] The hot-rolled steel coil is re-coiled and pickled to wash off the oxide scale on the surface, and then cold-rolled on a cold tandem rolling mill, and the cold-rolling reduction rate is controlled to be 75.4% to obtain a cold-roll...

Embodiment 2

[0047] The flow process of the production method of the high yield strength hot-dip galvanized micro-carbon aluminum killed steel plate provided by the invention is:

[0048] According to the design of steel composition, C: 0.01~0.04%, Si≤0.03%, Mn: 0.25%, P≤0.013%, S≤0.010%, Als: 0.028%, N≤0.005%, B: 0.001~0.008% , the balance is Fe and unavoidable impurities, using molten iron desulfurization, converter blowing, RH vacuum refining, continuous casting to obtain continuous casting slabs.

[0049] The continuous casting slab is heated by a heating furnace, rolled on a continuous hot rolling mill, cooled under control, and then coiled. The coiling temperature after hot rolling is controlled at 732°C to produce qualified hot-rolled steel coils.

[0050] The hot-rolled steel coil is re-coiled and pickled to wash off the oxide scale on the surface, and then cold-rolled on a cold tandem rolling mill, and the cold-rolling reduction rate is controlled to be 76.2% to obtain a cold-roll...

Embodiment 3

[0054] The flow process of the production method of the high yield strength hot-dip galvanized micro-carbon aluminum killed steel plate provided by the invention is:

[0055] According to the design of steel composition, C: 0.01~0.04%, Si≤0.03%, Mn: 0.24%, P≤0.013%, S≤0.010%, Als: 0.031%, N≤0.005%, B: 0.001~0.008% , the balance is Fe and unavoidable impurities, using molten iron desulfurization, converter blowing, RH vacuum refining, continuous casting to obtain continuous casting slabs.

[0056] The continuous casting slab is heated by a heating furnace, rolled on a continuous hot rolling mill, cooled under control, and then coiled. The coiling temperature after hot rolling is controlled at 722°C to produce qualified hot-rolled steel coils.

[0057] The hot-rolled steel coil is re-coiled and pickled to wash off the oxide scale on the surface, and then cold-rolled on a cold tandem rolling mill to control the cold-rolling reduction rate to 78.3% to obtain a cold-rolled steel pl...

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Abstract

The invention relates to a high-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and a production method thereof. The method comprises the following steps: carrying out desulphurization, bessemerizing, RH vacuum refining and continuous casting on molten iron so as to obtain a continuous casting sheet billet; carrying out hot rolling on the continuous casting sheet billet so as to obtain a hot rolled sheet billet; rolling the hot rolled sheet billet so as to obtain hot-rolled steel coil; carrying out uncoiling and acid pickling on the hot-rolled steel coil; carrying out cold rolling on the hot-rolled steel coil subjected to acid pickling so as to obtain a cold-rolled steel plate; carrying out annealing and hot galvanizing on the cold-rolled steel plate in a continuous annealing furnace; and carrying out finishing processing on the annealed cold-rolled steel plate. The high-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate produced according to the method has good forming properties and mechanical properties, and can satisfy the requirements of cargo trucks on the stamping formability of steel plates.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a hot-dip galvanized micro-carbon aluminum killed steel plate with high yield strength and a production method thereof. Background technique [0002] At present, many automobile factories use ordinary cold-rolled sheets St13 and St14 for supporting plates and reinforcing plate parts of series trucks, and usually rely on increasing plate thickness to improve strength. This method has great limitations. , not only increased a lot of cost, but also produced a limited carrying capacity of the passenger car, and poor fatigue resistance in addition. [0003] In recent years, with the continuous development of sheet metal forming technology in today's society, steel plates with high yield ratio are a new type of product applied to the production of plates and strips for passenger vehicles. Because of their unique excellent surface quality and suitable thickness toleran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02C23C2/06C23C2/40
Inventor 孙存友程晓杰乔建军闻达贾松孙建华李振
Owner SHOUGANG CORPORATION
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