Industrial production method of galvanized IF steel with high salt spray corrosion resistance

A production method and salt-spray-resistant technology, applied in hot-dip galvanizing process, metal material coating process, manufacturing converters, etc., can solve problems such as not meeting standard requirements, optimize zinc layer thickness, and improve salt-spray corrosion resistance Ability to improve corrosion resistance

Pending Publication Date: 2021-04-13
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The same batch of materials was sent to an OEM for salt spray test certification. The rating judgment method was adopted. After the test, the judgment and rating were carried out. The corrosion grade required to be less than or equal to 2.5 or not lower than the standard sample could be qualified. The first verification result was rated as 3.0. Does not meet standard requirements

Method used

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  • Industrial production method of galvanized IF steel with high salt spray corrosion resistance
  • Industrial production method of galvanized IF steel with high salt spray corrosion resistance
  • Industrial production method of galvanized IF steel with high salt spray corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0036] Embodiment 1-6 chemical composition percentage:

[0037]

Embodiment 1

[0038] Embodiment 1: The specific process after the specific research of the high salt spray corrosion resistance IF steel is as follows:

[0039] (1) Steelmaking process:

[0040] steelmaking control point Control range actual value Converter end point oxygen / ppm 400-500 400 RH oxygen blowing capacity / Nm 3

50-80 50 Oxygen at the end of RH decarburization / ppm 200-350 200 Aluminum loss / ppm 35-75 35 Constant pulling speed.m / min 0.8-1.6 0.8 Liquid level fluctuation control / mm ±5 ±5

[0041] (2) Hot rolling process:

[0042] hot rolling control point Control range actual value Dephosphorization water pressure / bar 190-210 190 In furnace time / min 180-196 180 Baking temperature / ℃ 1210-1250 1210 Convexity / μm 50-79 50 Cooling water pH between racks 7-9 7 Cooling water temperature / ℃ 20-32 20

[0043] (3) Galvanizing process:

[0044] Galvanized Control ...

Embodiment 2

[0046] Embodiment 2: The specific process after the specific research of the high salt spray corrosion resistance IF steel is as follows:

[0047] (1) Steelmaking process:

[0048] steelmaking control point Control range actual value Converter end point oxygen / ppm 400-500 465 RH oxygen blowing capacity / Nm 3

50-80 73 Oxygen at the end of RH decarburization / ppm 200-350 285 Aluminum loss / ppm 35-75 52 Constant pulling speed.m / min 0.8-1.6 1.1 Liquid level fluctuation control / mm ±5 ±5

[0049] (2) Hot rolling process:

[0050] hot rolling control point Control range actual value Dephosphorization water pressure / bar 190-210 201 In furnace time / min 180-196 186 Baking temperature / ℃ 1210-1250 1230 Convexity / μm 50-79 68 Cooling water pH between racks 7-9 8.2 Cooling water temperature / ℃ 20-32 20

[0051] (3) Galvanizing process:

[0052] Galvanized Contro...

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Abstract

The invention relates to an industrial production method of galvanized IF steel with high salt spray corrosion resistance, which comprises the steps of steelmaking, RH refining, continuous casting, hot rolling and galvanizing, in the galvanizing step, the speed of strip steel is controlled to be 120-130 m/min, the roughness of a working roll of a finishing machine is 2.5-3.5 [mu] m, the surface roughness Ra of a galvanized plate is controlled to be 1.2-1.6 [mu] m, the air knife spacing is 6-9 mm, and air knife pressure is 200-350 mbar; and a target zinc layer is accurately controlled at the upper limit of the zinc layer weight target value, and the salt spray corrosion resistance is improved. The IF steel plate galvanized sheet produced by the method can meet the requirement that the white rust area of the surface is less than 1% in a 120-hour salt spray test, and the salt spray corrosion resistance of the galvanized IF steel is greatly improved.

Description

technical field [0001] The invention relates to a production method of IF steel, in particular to an industrial production method of highly salt-spray corrosion-resistant galvanized IF steel. Background technique [0002] Salt spray test is an environmental test that uses artificially simulated salt spray environmental conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials. The judgment methods include: rating judgment method, weighing judgment method, corrosion appearance Judgment method, corrosion data statistical analysis method, etc. [0003] Automobile galvanized sheets must pass relevant laboratory certifications before being certified by relevant OEMs. Salt spray test is one of the important evaluation indicators. The situation where the automotive sheet is qualified in the salt spray test of the manufacturer but failed in the test of the OEM. [0004] HBIS Handan Iron and Steel products usually adopt the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/20C21D8/02C21C5/28C21C7/10C21C7/068
CPCC23C2/06C23C2/20C21D8/0226C21C5/28C21C7/10C21C7/068
Inventor 邓建军赵晓萌王亮亮陈志军吕超杰张才华程迪刘素丽
Owner HANDAN IRON & STEEL GROUP
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