Continuous zinc coating method of high-silicon high-manganese galvanized steel strip

A technology of galvanized steel strip and galvanized steel, which is applied in hot-dip galvanizing process, furnace, heat treatment equipment, etc., can solve the problems of reduced corrosion resistance of galvanized steel sheet, missed coating of zinc layer, and influence of wettability of steel sheet, etc., to achieve Effect of improving wettability and improving corrosion resistance

Inactive Publication Date: 2017-07-28
TANGSHAN IRON & STEEL GROUP +1
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current process of producing high-strength hot-dip galvanized sheets using the United States Iron and Steel Co. It cannot be restored during the process, which will affect the wettability of the zinc liquid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: The continuous galvanizing method of the present high-silicon and high-manganese galvanized steel strip adopts the following specific processes.

[0014] Slab (billet) chemical composition (wt): C 0.07%, Mn 1.12%, S 0.006%, P 0.012%, Si 0.08%, Als 0.034%, Nb 0.045%, Ti 0.020%, Cr 0.026%, the rest is Fe and inclusions within the allowable range.

[0015] Hot rolling process: billet heating temperature is 1150°C, soaking (holding) time is 2 hours, final rolling temperature is 880°C, cooling adopts front-end cooling, and coiling temperature is 650°C. The rolling specification of hot-rolled strip steel is 3.5×1020mm, and its properties are: tensile strength 627MPa, yield strength 594MPa, and elongation 25.0%.

[0016] Cold rolling process: cold rolling rolling thickness is 1.2×1000mm.

[0017] Galvanizing process: adjust the dew point to -5°C 3 hours before the production of this steel type. The speed of the production line is 100m / min, the temperature of t...

Embodiment 2

[0018] Embodiment 2: The continuous galvanizing method of the present high-silicon and high-manganese galvanized steel strip adopts the following specific processes.

[0019] Slab (billet) chemical composition (wt): C 0.06%, Mn 1.16%, S 0.008%, P 0.010%, Si 0.03%, Als 0.034%, Nb 0.049%, Ti 0.022%, Cr 0.023%, the rest is Fe and inclusions within the allowable range.

[0020] Hot rolling process: billet heating temperature is 1150°C, soaking (holding) time is 2 hours, final rolling temperature is 887°C, front-end cooling is used for cooling, and coiling temperature is 634°C. The rolling specification of hot-rolled strip steel is 2.5×1270mm, and its properties are: tensile strength 634MPa, yield strength 595MPa, and elongation 25.5%.

[0021] Cold rolling process: cold rolling rolling thickness is 0.7×1250mm.

[0022] Galvanizing process: Adjust the dew point to +3°C 3 hours before the production of this steel type. The speed of the production line is 110m / min, the temperature...

Embodiment 3

[0023] Embodiment 3: The continuous galvanizing method of the high-silicon and high-manganese galvanized steel strip adopts the following specific process.

[0024] Slab (billet) chemical composition (wt): C 0.07%, Mn 1.19%, S 0.008%, P 0.014%, Si 0.08%, Als 0.038%, Nb 0.043%, Ti 0.024%, Cr 0.027%, the rest is Fe and inclusions within the allowable range.

[0025] Hot rolling process: billet heating temperature is 1150°C, soaking (holding) time is 2 hours, final rolling temperature is 887°C, front-end cooling is used for cooling, and coiling temperature is 634°C. The rolling specification of hot-rolled strip steel is 3.0×1270mm, and its properties are: tensile strength 590MPa, yield strength 512MPa, and elongation 23.5%.

[0026] Cold rolling process: cold rolling thickness is 1.0×1250mm.

[0027] Galvanizing process: Adjust the dew point to -10°C 3 hours before the production of this steel type. The speed of the production line is 100m / min, the temperature of the strip in ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Yield strengthaaaaaaaaaa
Yield strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a continuous zinc coating method of a high-silicon high-manganese galvanized steel strip. The dew points of all sections in an annealing furnace in a continuous zinc coating production line are controlled as follows: a preheating section: +10-minus 20 DEG C, a heating section: +10-minus 20 DEG C, and a soaking zone: minus 25-minus 50 DEG C. With adoption of the continuous zinc coating method, the dew points in the furnace are raised to oxidize the surface of strip steel, so that oxide of silicon, manganese and other elements is positioned under oxide of iron, and in this way, in the soaking zone and a follow-up balanced section in the annealing furnace, and under high temperature and the protective atmosphere of 5% H2+N2, iron is reduced to pure iron; and under the condition, oxide of silicon and manganese is not reduced but positioned under pure iron, so that the situation that oxide of silicon and manganese is not reduced can be better avoided, and wettability of strip steel is not affected to avoid skip plating defect. According to the method, oxidation of silicon and manganese elements is controlled through controlling the dew points the galvanized wire furnace to improve the wettability between a steel plate and galvanizing zinc and the corrosion resistance of a zinc coating.

Description

technical field [0001] The invention relates to a production method of galvanized steel, in particular to a continuous galvanizing method for high-silicon and high-manganese galvanized steel strips. Background technique [0002] With the development of the steel industry, the automobile machinery manufacturing industry has also developed rapidly. As people's requirements for emission reduction and safety are getting higher and higher, the proportion of high-strength steel in automobile sheets is getting higher and higher; at the same time, the corrosion resistance of automobile steel determines the service life of automobiles, so that high-strength hot-dip galvanized sheets It is widely used in automobile steel. [0003] High-strength automotive sheets are mainly achieved by adding a certain amount of alloying elements to steel, mainly carbon, manganese, silicon, chromium or molybdenum, etc., and achieving high strength by solid solution strengthening, precipitation strengt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C2/06C23C2/40C21D1/26C21D9/52C23C2/02C22C38/04C22C38/02C22C38/06C22C38/28C22C38/26C22C38/18C22C38/12
CPCC23C2/06C21D1/26C21D9/52C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C22C38/26C22C38/28C23C2/02C23C2/40
Inventor 李建英吴建国王言峰张斌宁扬史文韩冰李经哲武冠华
Owner TANGSHAN IRON & STEEL GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap