Alloying soaking furnace capable of realizing hot dip galvanizing coating alloying annealing curve free inclination of soaking temperature

An annealing curve and alloying technology, which is applied in heat treatment furnaces, hot-dip coating processes, furnaces, etc., can solve the problems of poor anti-powdering performance of coatings, excessive growth of Γ phase in coatings, and greater influence, and achieve Excellent formability and anti-powdering performance of the coating

Active 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

However, due to the "chimney effect" of the alloying furnace (the gas below the alloying furnace is pumped to the top of the alloying furnace), the heated hot gas is continuously pumped from the bottom of the alloying furnace to the top of the alloying furnace, so that the The unreasonable coating alloying annealing process of steel in the soaking section is prone to low temperature first and then high temperature, resulting in excessive growth of Γ phase in the coating, and poor powdering resistance of the coating
[0005] In order to realize the inclination of the alloying soaking temperature

Method used

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  • Alloying soaking furnace capable of realizing hot dip galvanizing coating alloying annealing curve free inclination of soaking temperature
  • Alloying soaking furnace capable of realizing hot dip galvanizing coating alloying annealing curve free inclination of soaking temperature
  • Alloying soaking furnace capable of realizing hot dip galvanizing coating alloying annealing curve free inclination of soaking temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: A hot-dip galvanizing line that can produce alloyed hot-dip galvanized products. The strip width specification is: 700-1280mm. The soaking section of the alloying furnace is divided into four sections along the strip running direction, each section is 7.5m, The furnace wall adopts a movable structure, and its details are as follows: Figure 5 shown. Each window is made up of two movable furnace walls 32 whose height H1 is 500mm and can move to both sides. Figure 5a Middle L a shown) is 1080mm. When producing IF steel automotive outer panels with a width of 700mm, the opening width of the window (such as Figure 5b Middle L b Shown) is 300mm (that is, the width of the window after opening is the width of the strip minus 400mm), so that the strip is cooled more evenly along the width direction, and the iron content of the produced strip coating is as shown in Table 1. The iron content of the coating is very uniform.

[0028] Table 1 The iron content of t...

Embodiment 2

[0033] Example 2 (the width of the window after opening is the strip width minus 200mm, and the difference in the iron content of the coating is less than 0.5%): a hot-dip galvanizing unit that can produce alloyed hot-dip galvanized products, and the strip width specification is: 800-1480mm , the soaking section of the alloying furnace is divided into four sections along the running direction of the strip steel, each section is 7.5m long, and the furnace wall adopts a movable structure. Refer to Figure 5a , 5b . Each window is composed of two movable furnace walls with a height H1 of 500mm that can move to both sides. When the movable furnace wall moves to the maximum limit range on both sides, the width of the window (such as Figure 5a Middle L a shown) is 1280mm. When producing bake-hardened steel automotive panels with a width of 1480 mm, the opening width of the window (eg Figure 5b Middle L b Shown) is 1280mm, so that the strip is cooled more uniformly along the w...

Embodiment 3

[0036] Example 3: A unit for producing alloyed hot-dip galvanized products. The strip width specification is: 800-1800mm. The soaking section of the alloying furnace is also divided into four sections along the running direction of the strip, each section is 7.5m. The furnace wall adopts Structural design of opening and closing window insulation cover plate, the furnace wall is divided into five sections along the strip width direction, which can be opened and closed up and down. The middle section (600mm) is controlled separately, and the left section L1 (300mm) and The right segment R1 (300mm) is jointly controlled, and the left second segment L2 (300mm) and the right second segment R2 (300mm) are jointly controlled, specifically as follows Figure 6 shown. When producing alloyed hot-dip galvanized bake-hardening steel with a width of 1680mm, open the middle three covers (total 1200mm wide), so that the strip steel can be cooled more evenly along the width direction, and the...

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Abstract

The invention relates to a device for realizing the free inclination and heat evenness of an alloying furnace heat evenness section cladding alloying annealing curve; with a window which can be opened and closed on the furnace wall, the device can regulate the heat preserving performance and radiation rate of an alloying furnace, so that the alloying heat evenness temperature of a unit can realize inclination from high temperature to low temperature under any production condition including the precondition of maximum hourly output, and the free inclination of heat evenness temperature can be realized at lower unit speed or under the lower hourly output precondition by regulating the heating power of the heat evenness section. The device which can regulate the cooling speed of the alloying furnace heat evenness section strip steel and the adjustment to the heating power at the heat evenness section can realize the goal of the cladding alloying inclination heat evenness annealing of the heat evenness temperature of different alloyed products from high temperature to low temperature under different process conditions (e.g. different product specifications, unit speed, heat evenness temperature, etc.). In the alloyed hot-dip galvanized steel sheet manufactured by the device, the V-bend powder resistance of the cladding can reach Grade 2 to Grade 3.

Description

technical field [0001] This patent relates to a device for achieving soaking in the soaking section of an alloying furnace, in particular to a device for soaking in a free-sloping alloying annealing curve of a coating in the soaking section of an alloying furnace. Background technique [0002] Alloyed galvanized steel sheet (hereinafter referred to as GA steel sheet) is a zinc-iron alloy coating product obtained by online annealing of the coating after hot dipping. The production cost of this product is relatively low, and its corrosion resistance, coating performance, and welding performance It is very suitable for applications in industries such as automobiles, home appliances, and construction. In particular, these steel plates can meet the requirements of inner and outer panels of automobiles and outer panels of home appliances. [0003] Hot-dip galvanizing and alloying process of steel strip such as figure 1 As shown, after the strip steel 1 is annealed, it is immersed...

Claims

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Application Information

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