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Sink roll shaft sleeve

A technology for sinking rollers and bushings, which is applied in the direction of coating, metal material coating technology, process efficiency improvement, etc., can solve the problems of difficulty in popularization and use, high price of cobalt-based alloys, etc., to improve the shape and distribution of inclusions, Excellent resistance to zinc liquid corrosion and the effect of improving mechanical properties

Inactive Publication Date: 2015-01-21
JIANGSU HUAYE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bushing materials currently used in hot-dip galvanizing units at home and abroad include cobalt-based alloy Stellite 6B, etc. Among them, cobalt-based alloys have excellent properties such as wear resistance, corrosion resistance, high temperature resistance, and high hardness. They are used as sinker roller bushings, and the use effect Best, but cobalt-based alloys are expensive and difficult to promote and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The sunken roller sleeve material is smelted in a 500 kg intermediate frequency induction electric furnace, and the sunken roller is composed of the following components:

[0024] C 0.24%%, Mn 0.60%%, Si 0.80%%, Zr 0.02%, Al 0.035%, Cr2.7%, Ni 0.75%, Y 0.02, Mo 0.5%, Nb 0.03%, B 2.5%, N 0.003, P <0.035, S <0.045, the rest is Fe; the melting steps are as follows:

[0025] (1) Use electric furnace to smelt scrap steel, heat and melt ordinary scrap steel, recarburizer, and mix, add Ni after molten steel is melted, and continue heating to 1630°C to make Ni content 0.75%;

[0026] (2) When the content of C is 0.24%-0.45%, tap steel into the ladle;

[0027] (3) In the molten steel tapping process of step (2), a desulfurizer is added to the ladle for desulfurization, and calcium fluoride is used as the desulfurizer to make the S in the molten steel <0.045;

[0028] (4) Add Mn, Si, Zr, Al, Cr, Y, N to the molten steel to control the content of each element in the molten steel to Mn 0.60...

Embodiment 2

[0035] The sunken roller sleeve material is smelted in a 500 kg intermediate frequency induction electric furnace, and the sunken roller is composed of the following components:

[0036] C 0.32%, Mn 1.2%, Si 0.90%, Zr 0.060%, Al 0.055%, Cr2.9%, Ni 0.95%, Y 0.025%, Mo 1.4%, Nb 0.045%, B 2.9%, N 0.006, P <0.025, S <0.025, the rest is Fe; the sunken roller bushing is made through the following steps:

[0037] (1) Use electric furnace to smelt scrap steel, heat and melt ordinary scrap steel, recarburizer, and mix, add Ni after molten steel is melted, and continue to heat up to 1640°C to make Ni content 0.95%;

[0038] (2) When the content of C is between 0.32%-0.45%, tap steel into the ladle;

[0039] (3) During the tapping process of molten steel in step (2), the desulphurizing agent lime is added to the ladle for desulfurization, so that the S in the molten steel <0.025;

[0040] (4) Add Mn, Si, Zr, Al, Cr, Y, N to the molten steel to control the content of each element in the molten stee...

Embodiment 3

[0047] The sunken roller sleeve material is smelted in a 500 kg intermediate frequency induction electric furnace, and the sunken roller is composed of the following components:

[0048] C 0.45%, Mn 2.0%, Si 1.10%, Zr 0.12%, Al 0.080%, Cr3.5%, Ni 1.60%, Y 0.03%, Mo 2.5%, Nb 0.55%, B 3.3%, N 0.01, P <0.035, S <0.045, the rest is Fe; the sinking roller bushing is made through the following steps:

[0049] (1) Use electric furnace to smelt scrap steel, heat and melt ordinary scrap steel, recarburizer, and mix, add Ni after molten steel is melted, and continue to heat up to 1650°C to make the Ni content 1.60%;

[0050] (2) When the content of C is between 0.40%-0.45%, tap steel into the ladle;

[0051] (3) In the molten steel tapping process of step (2), the desulfurizing agent magnesium oxide powder is added to the ladle for desulfurization, so that the S in the molten steel <0.045;

[0052] (4) Add Mn, Si, Zr, Al, Cr, Y, N to the molten steel to control the content of each element in the ...

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PUM

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Abstract

The invention discloses a sink roll shaft sleeve which is composed of 0.24%-0.45% of C, 0.60%-2.0% of Mn, 0.80%-1.10% of Si, 0.02%-0.12% of Zr, 0.035%-0.080% of Al, 2.7%-3.5% of Cr, 0.75%-1.60% of Ni, 0.02%-0.03% of Y, 0.5%-2.5% of Mo, 0.03%-0.55% of Nb, 2.5%-3.3% of B, 0.003%-0.01% of N, less than 0.035% of P, less than 0.045% of S and the balance of Fe. By adding the boron element on the basis of the low-carbon high-speed steel, the sink roll shaft sleeve has excellent liquid zinc corrosion resistance on the premise of keeping favorable high-temperature red hardness of the high-speed steel. Besides, proper amounts of yttrium, magnesium, calcium, titanium, niobium and potassium are also added to mainly perform the functions of removing oxygen and sulfur, refining the structure and improving the inclusion morphology and distribution, thereby being beneficial to enhancing the mechanical properties of the sink roll shaft sleeve and especially the obdurability of the sink roll shaft sleeve.

Description

technical field [0001] The invention relates to a sinking roller, in particular to a sinking roller sleeve with strong abrasion resistance and high strength. Background technique [0002] During the production of continuous hot-dip galvanizing, the steel strip changes direction by sinking rolls immersed in zinc liquid (temperature 460~480°C), that is, from entering the galvanizing pot to exiting the galvanizing pot, and the galvanized layer is solidified and cooled. The sinking roller that rotates with the movement of the steel belt is supported on the fixed frame by the bushes on both sides, and the bushes act as sliding bearings. The bushing materials currently used in hot-dip galvanizing units at home and abroad include cobalt-based alloy Stellite 6B, etc. Among them, cobalt-based alloys have excellent properties such as wear resistance, corrosion resistance, high temperature resistance, and high hardness. They are used as sinker roller bushings, and the use effect Pref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/58C22C38/54C22C33/06C21D1/30C23C2/00
CPCC22C38/001C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/18C22C38/32C22C38/60C23C2/003Y02P10/20
Inventor 王茂庭王利金王金龙蔡高银
Owner JIANGSU HUAYE TECH
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