Method for producing structure-level galvanized product with pressure of 390 to 500 MPa through controlling annealing temperature

A technology of annealing temperature and structure level, which is applied in the field of metallurgical plate production, can solve the problems of small profit margin, high cost, and restrictions on the promotion and use of structural grade galvanized products, so as to improve profit margin, reduce cost, and achieve good processing The effect of performance and appearance quality

Active Publication Date: 2014-07-02
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the usual structural grade galvanized products with a strength of 390-500Mpa are mainly achieved by adding alloys to meet the performance requirements. To meet the standard performance requirements, the addition of different grades of alloys is different, and the cost is high. Compared with the relatively small profit margin, this situation greatly limits the promotion and use of structural grade galvanized products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0013] 1. The method of the present invention is implemented on a continuous galvanizing production line using an improved Sendzimir method

[0014] The technological process is: uncoiling-cleaning-annealing furnace heating (preheating-direct combustion heating-radiant tube heating-radiant tube soaking-spray cooling)-galvanizing-smooth straightening-coiling-finished product. The product specifications are 0.6~2.0mm×820~1650mm, and the yield strength grades of the high-grade structural grade galvanized products involved are 390-440MPa and 440-500MPa. The annealing furnace heating process of the improved Sendzimir galvanizing production line includes the preheating link, the open flame direct combustion heating link, the radiant tube heating link, the radiant tube soaking link and the spray cooling link; the annealing furnace used in the annealing furnace heating process corresponds to Set up preheating section, open flame direct combustion heating section, radiant tube heating sec...

Embodiment 1

[0019] Example 1: Improved Sendzimir method to produce high-grade galvanized products of S390GD+Z structure. The volume number of the product is 1Y3556Y0, chemical composition: C: 0.19%, Si: 0.02%, Mn: 0.40%, P: 0.013%, S: 0.004%, ALs: 0.015%. The specification of the strip steel is 1.8×1250mm, the heating temperature of the strip steel is 640-645℃, and the soaking temperature of the strip steel is 590-620℃. Other parameters are the same as the operating parameters of ordinary galvanized products. The running speed of the strip is 48m / min. The temperature of the strip steel entering the zinc pot: 483℃, the temperature of the zinc liquid: 467℃. The actual performance of the product is yield strength: 400MPa, tensile strength: 460MPa, A80: 26.5%.

Embodiment 2

[0020] Example 2: The improved Sendzimir process produces high-grade G450 structural grade galvanized products. The volume number of the product is 1Y51195T1, chemical composition: C: 0.19%, Si: 0.01%, Mn: 0.37%, P: 0.014%, S: 0.006%, ALs: 0.019%. The specification of the strip steel is 1.5×1120mm, the heating temperature of the strip steel is 630-635℃, and the soaking temperature of the strip steel is 585-600℃. Other parameters are the same as the operating parameters of ordinary galvanized products. The running speed of the strip is 50m / min. The temperature of the strip steel entering the zinc pot: 483℃, the temperature of the zinc liquid: 467℃. The actual performance of the product is yield strength: 455MPa, tensile strength: 515MPa, A80: 20%.

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Abstract

The invention relates to a method for producing a structure-level galvanized product with the pressure of 390 to 500 MPa through controlling the annealing temperature, and belongs to the technical field of metallurgy plate production. The technical scheme that the method comprises processes: cleaning, heating by an annealing furnace, galvanizing and cooling after galvanizing, wherein the heating by an annealing furnace comprises links of preheating, heating, soaking and cold spraying. The method is characterized in that the control on the product recovery and recrystallization degree is achieved through temperature control to meet the requirement on the performance of the different structure-level galvanized products with pressure of 390 to 500 MPa; the control on the product recovery and recrystallization degree is accomplished by the heating link and the soaking link in the process of heating by the annealing furnace, and the heating temperature and the soaking temperature of the product are different according to different levels of structural steel, and the annealing temperature of the product is the heating temperature of the product. The method widens the conventional method for producing high-grade structure-level galvanized product, is beneficial to improvement of the profit margin of the galvanized product, enhances the enterprises' market competitiveness, and creates considerable economic benefits for enterprises while meeting the various requirements of users.

Description

Technical field [0001] The invention relates to a method for producing 390-500Mpa structural grade galvanized products by controlling annealing temperature, and belongs to the technical field of metallurgical plate production. Background technique [0002] Structural-grade galvanized products are different from ordinary commercial-grade galvanized products. According to different uses, structural-grade galvanized products have strict mechanical performance requirements in addition to certain specifications. At the same time, structural-grade galvanized products have energy saving and emission reduction requirements. It is of great significance. Due to its high strength, it can replace the original thick-specification parts, reducing the total weight of parts, overall equipment and even large buildings. Structural galvanized products are mainly used in large-scale construction, steel structure, home appliances, automobiles and other industries. At present, the usual strength of 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D9/54
Inventor 李建英齐长发陈礼斌梅淑文姚连胜张静范磊杨青王金刚
Owner HEBEI IRON AND STEEL
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