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Method for controlling alloyed hot dip galvanizing steel plate coating phase structure and alloyed hot dip galvanizing steel plate

A hot-dip galvanized steel sheet and alloying technology, which is applied in the coating phase structure of alloyed hot-dip galvanized steel sheet, and the field of alloyed hot-dip galvanized steel sheet, can solve problems such as poor surface quality, poor formability of steel sheet, and flaky shedding of the coating. Achieve the effects of good anti-powdering performance and good stamping performance of the coating

Inactive Publication Date: 2009-03-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the analysis results of a large number of industrial production experiments, when the iron content (mass percentage) of the coating is controlled between 6.5% and 10%, especially when the average iron content of the coating is between 6.5% and 9%, there must be a large amount of ζ on the surface of the coating phase, and even a certain amount of η phase remains in some places, so not only the surface quality is poor, the stamping force is high, and the coating is easy to flake off, the formability of the steel plate is also poor, and the steel plate is easy to crack during stamping
Therefore, the lower control limit of iron content proposed by this patent is unreasonable

Method used

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  • Method for controlling alloyed hot dip galvanizing steel plate coating phase structure and alloyed hot dip galvanizing steel plate
  • Method for controlling alloyed hot dip galvanizing steel plate coating phase structure and alloyed hot dip galvanizing steel plate
  • Method for controlling alloyed hot dip galvanizing steel plate coating phase structure and alloyed hot dip galvanizing steel plate

Examples

Experimental program
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Effect test

example 1

[0068] For a bake-hardened steel automotive outer panel with a thickness of 0.75mm, the chemical composition of the substrate is: C: 0.0023%; Si: 0.005%; Mn: 0.50%; P: 0.050%; S: 0.008%; N: 0.0023%; Sol. Al: 0.046%; Nb: 0.013%. After continuous casting, the slab is heated to 1200°C, held for 2 hours, and hot-rolled. The finishing temperature of hot rolling is 910°C, and the coiling temperature is 700°C. After the hot-rolled coil is naturally cooled, it is pickled and cold-rolled. The cold-rolled reduction rate is 78%, and then it is cleaned, annealed and hot-dip galvanized. The annealing temperature is 850 ° C, and the holding time is 30 seconds. The temperature is 470°C, the temperature of the zinc liquid in the zinc pot is 460°C, the aluminum content of the zinc liquid is 0.125%, and the coating weight is 48g / m after the strip steel is purged by an air knife 2 , heated to 490°C by a high-frequency induction heating furnace, and then enter the heat preservation section for h...

example 2

[0070] For the IF steel automotive inner panel with a thickness of 0.8mm, the chemical composition of the substrate is as follows: C: 0.0015%; Si: 0.003%; Mn: 0.12%; P: 0.010%; S: 0.006%; N: 0.0020% ; Sol. Al: 0.030%; Ti: 0.030%; Nb: 0.015%. After continuous casting, the slab is heated to 1210°C, held for 2 hours, and hot-rolled. The finishing temperature of hot rolling is 920°C, and the coiling temperature is 720°C. After the hot-rolled coil is naturally cooled, it is pickled and cold-rolled. The cold-rolled reduction rate is 78%, and then it is cleaned, annealed and hot-dip galvanized. The annealing temperature is 860 ° C, and the holding time is 30 seconds. The temperature is 460°C, the temperature of the zinc liquid in the zinc pot is 455°C, the aluminum content of the zinc liquid is 0.130%, and the coating weight is 50g / m after the strip is purged by an air knife 2 , heated to 460°C by a high-frequency induction heating furnace, and then enter the heat preservation secti...

example 3

[0072] For a high-strength IF steel automotive outer panel with a thickness of 0.7mm, the chemical composition of the substrate is as follows: C: 0.0015%; Si: 0.045%; Mn: 0.39%; P: 0.030%; S: 0.008%; N: 0.0016 %; Sol. Al: 0.030%; Nb: 0.023%; Ti: 0.025%; B: 0.0002%. After continuous casting, the slab is heated to 1210°C, held for 2 hours, and then hot-rolled. The finishing temperature of hot rolling is 910°C, and the coiling temperature is 670°C. After the hot-rolled coil is naturally cooled, it is pickled and cold-rolled. The cold-rolled reduction rate is 75%, and then it is cleaned, annealed and hot-dip galvanized. The annealing temperature is 790 ° C, and the holding time is 30 seconds. The temperature is 470°C, the temperature of the zinc liquid in the zinc pot is 460°C, the aluminum content of the zinc liquid is 0.125%, and the coating weight is 49g / m after the strip is purged by an air knife 2 , heated to 500°C by a high-frequency induction heating furnace, and then ente...

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Abstract

The invention provides a method for controlling alloyed hot-dip galvanized cladding, in particular hot-dip galvanized steel sheet cladding phase structure. The method comprises the following steps: at least a set of strip steel which is provided with a steel stabilizing device and can stably control hot-dip galvanization process parameters and air knife parameters to obtain even thickness of the cladding is arranged between an air knife and a top roller; an inclined alloyed cladding heat treatment annealing curve with even temperature sections from high temperature to low temperature is selected and the strip steel is evenly alloyed, to improve the evenness of the alloying process and the alloying degree of the strip steel cladding; in addition, flat roll surface roughness and flat extensibility are selected, to control the cladding surface roughness and cladding surface flat rate and improve the shaping performance of the steel sheet. The invention also provides an alloyed hot-dip galvanized steel sheet manufactured by the method for controlling the alloyed hot-dip galvanized steel sheet cladding phase structure; the hot-dip galvanized steel sheet has excellent cladding powder resistance and shaping performance, and is very applicable to automobile internal and external plates as well as household electric appliance external plates.

Description

technical field [0001] The invention relates to a method for controlling the coating phase structure of an alloyed coating, especially an alloyed hot-dip galvanized steel sheet, and an alloyed hot-dip galvanized steel sheet produced by the method. Background technique [0002] With the improvement of the corrosion resistance requirements of the car body, galvanized automobile sheets are more and more used in the inner and outer sheets of automobiles. The surface quality of the electro-galvanized automobile sheet is good, but the coating of the electro-galvanized steel sheet is relatively thin, the corrosion resistance is relatively low, and the production cost of the electro-galvanized sheet with a thick coating is high, thus limiting the application of the electro-galvanized automobile sheet. The hot-dip pure galvanized automotive sheet can be plated very thickly, and there is a lot of room for improving the corrosion resistance, but the pure zinc coating has poor welding p...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/40C23C2/26C22F1/16C21D9/56B32B15/01
Inventor 李俊张理扬林秀贞
Owner BAOSHAN IRON & STEEL CO LTD
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