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Preparation method of white cast iron for roller, and white cast iron

A technology of white cast iron and rolling rolls, applied in the field of foundry, can solve the problems of limited rolling capacity, low service life, block drop of the pass shape, etc., and achieve the effect of improving the operation rate of the rolling mill, improving the surface quality, and reducing the number of roll changes.

Active Publication Date: 2020-12-11
江苏凯达重工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the wear resistance, hardness, thermal fatigue impact resistance and fission resistance of ordinary materials cannot meet the requirements of hot rolling. Defects such as lumps, pockmarks, and cracks seriously affect the surface quality of hot-rolled stainless steel round bars, and have short service life, frequent roll changes and adjustments, which limit the increase in rolling capacity and affect the yield and yield of stainless steel bars.

Method used

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  • Preparation method of white cast iron for roller, and white cast iron

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preparation example Construction

[0028] Such as figure 1 Shown, according to the preparation method of roll white cast iron of the embodiment of the present invention, comprises the following steps:

[0029] S1. Smelting: Add pig iron, scrap steel, ferrochrome, ferromolybdenum, pure nickel, ferrovanadium, and ferrotungsten to the furnace for smelting, so that the chemical composition of the molten iron meets the content requirements of white cast iron, and raise the temperature to obtain white iron , ready to tap; S2, out-of-furnace treatment: adding yttrium-based heavy rare earth along with the flow when tapping, inoculating and modifying the white hot metal, and then cleaning the slag. Content requirements of white cast iron. S3. Centrifugal casting: After the molten iron in the ladle cools down, remove the slag again, then put anti-oxidation glass slag on the liquid surface of the molten iron, quickly pour the molten iron into a high-speed rotating centrifugal mold, and obtain white cast iron by centrifug...

Embodiment 1

[0050] Prepare a 380×650mm hot-rolled 304 stainless steel rod finish rolling white cast iron roll, the target roll white cast iron chemical composition and weight percentage requirements are: C is 3.0-3.5%, Si is 0.7-1.2% , Mn is 0.5-1.5%, P≤0.05%, S≤0.03%, Ni is 2.0-3.0%, Mo is 1.0-2.0%, V is 1.0-2.0%, Cr is 2.0-3.0%, W is 1.0- 2.0%, Re is 0.03-0.07%, and the rest is Fe and unavoidable impurities. Specific steps are as follows:

[0051] (1) Smelting: Add a certain proportion of pig iron, scrap steel, ferrochrome, ferromolybdenum, pure nickel, ferrovanadium, and ferrotungsten to the intermediate frequency furnace for smelting, and the chemical composition and weight percentage of the obtained white cast iron are: C 3.22% for Si, 0.92% for Si, 0.58% for Mn, 0.04% for P, S≤0.029%, 2.3% for Ni, 1.62% for Mo, 1.65% for V, 2.33% for Cr, 1.44% for W, and the rest For Fe and unavoidable impurities. And raise the temperature to 1600°C to obtain white molten iron, keep it warm for 1...

Embodiment 2

[0058] Prepare a 480×700mm hot-rolled 304 stainless steel rod finish rolling white cast iron roll, the target roll white cast iron chemical composition and weight percentage requirements are: C is 3.0-3.5%, Si is 0.7-1.2% , Mn is 0.5-1.5%, P≤0.05%, S≤0.03%, Ni is 2.0-3.0%, Mo is 1.0-2.0%, V is 1.0-2.0%, Cr is 2.0-3.0%, W is 1.0- 2.0%, Re is 0.03-0.07%, and the rest is Fe and unavoidable impurities. Specific steps are as follows:

[0059] (1) Smelting: Add a certain proportion of pig iron, scrap steel, ferrochrome, ferromolybdenum, pure nickel, ferrovanadium, and ferrotungsten to the intermediate frequency furnace for smelting, and the chemical composition and weight percentage of the obtained white cast iron are: C 3.11%, Si 0.77%, Mn 0.73%, P 0.04%, S≤0.026%, Ni 2.7%, Mo 1.36%, V 1.67%, Cr 2.45%, W 1.88%, and the rest For Fe and unavoidable impurities. And raise the temperature to 1600°C to obtain white molten iron, keep it warm for 10 minutes, stop the power supply to the...

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Abstract

The invention discloses a preparation method of white cast iron for a roller, and the white cast iron. The preparation method of the white cast iron for the roller comprises the following steps that S1, smelting is conducted, specifically, pig iron, scrap steel, ferrochrome, ferromolybdenum, pure nickel, ferrovanadium and ferrotungsten are added into a furnace to be smelted, so that chemical components of molten iron meet the content requirement of the white cast iron, the temperature is increased, the white molten iron is obtained, and tapping is prepared; S2, outside-furnace treatment is conducted, specifically, yttrium-based heavy rare earth is added along with flow during tapping, inoculation modification treatment is conducted on the white cast iron, then slag removal is conducted, and the chemical components of the white cast iron subjected to outside-furnace treatment meet the content requirement of the white cast iron for the roller; S3, centrifugal casting is conducted; S4, destressing treatment is conducted; S5, processing forming is conducted; and S6, modification treatment is conducted, specifically, the white cast iron roller with the allowance reserved is tempered. The white cast iron prepared by the method for the roller has higher wear resistance, thermal cracking resistance and high red hardness, and the roller prepared from the white cast iron for the roller has the longer service life.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a preparation method of white cast iron for rolls and the white cast iron. Background technique [0002] During hot rolling, due to the high alloy composition and strong deformation resistance of the rolling material, the cooling speed of the rolling material is fast and the hardness is high during the rolling process. , Anti-wear performance has higher requirements. However, the wear resistance, hardness, thermal fatigue impact resistance and fission resistance of ordinary materials cannot meet the requirements of hot rolling. Defects such as lumps, pockmarks, and cracks seriously affect the surface quality of hot-rolled stainless steel round bars, and have short service life, frequent roll changes and adjustments, which limit the increase in rolling capacity and affect the yield and yield of stainless steel bars. . Contents of the invention [0003] The present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C22C37/10C22C37/08B22D13/02C21D5/04C21D9/38
CPCB22D13/02C21D5/04C21D9/38C22C33/08C22C37/08C22C37/10Y02P10/20
Inventor 许健周国祥周群
Owner 江苏凯达重工股份有限公司
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