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A kind of cast iron material skin-pass mill work roll and its manufacturing method

A technology of work rolls and levelling mills, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of insignificant effect, oxide skin pits, and large grinding amount under the machine, and achieve good comprehensive mechanical properties, molten iron and other problems. The effect of uniform composition and improved wear resistance

Active Publication Date: 2021-03-30
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the market has put forward higher requirements for the precision and surface quality of hot-rolled sheets, the leveling volume of the tempering machine has continued to increase, which requires the work rolls of the tempering machine to have stronger wear resistance and hardness. The currently used forged steel material There are certain problems in the working rolls, not only the machine cycle is short, the grinding amount of the lower machine is large, but also there are scale pits in use, which seriously restricts the efficiency of the tempering machine. Although the forged steel roll has high hardness, due to the There is no carbide in the medium, only rely on the hardness of the matrix to improve the wear resistance and resist the pressure of the scale, the effect is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A cast iron tempering machine work roll, the specification is ￠780 / 730×1850×3902, the radius of the working layer is 25mm, the hardness requirement is HSC80-85, the alloy composition and weight percentage of the working layer of the roll are: C: 2.30 %, Si: 0.30%, Mn: 0.60%, Cr: 10.00%, Ni: 0.80%, Mo: 0.60%, S≤0.10%, P≤0.05%, and the rest are Fe and unavoidable impurities.

[0023] The manufacturing method of the work roll of the cast iron material tempering machine is as follows:

[0024] a. Put the core material and the content of each alloy element in the working layer into the induction furnace for melting according to the above ratio. The melting temperature of the working layer is 1400℃~1500℃, and the melting temperature of the core layer is 1450℃~1550℃. Electromagnetic stirring The force makes the chemical composition of the molten iron uniform and improves the quality of the molten iron.

[0025] b. Centrifugal compound casting is used to cast the outer cast ir...

Embodiment 2

[0029] The steps of the working roll manufacturing method in this embodiment are the same as in Example 1, except that the alloy composition and weight percentage of the working layer of the roll are: C: 3.50%, Si: 1.00%, Mn: 1.50%, Cr: 20.00%, Ni: 2.00%, Mo: 2.00%, S≤0.10%, P≤0.05%, the rest is Fe and unavoidable impurities.

[0030] After testing, the hardness of the working layer of the work roll of the cast iron tempering machine is 82-83HSC, which meets the hardness requirements.

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PUM

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Abstract

The invention discloses a working roller of a cast-iron material temper mill. The working roller comprises a working layer made of a cast-iron material, and a nodular cast iron core part, wherein theworking layer of the roller is prepared from the following chemical components in percentage by weight: 2.30-3.50% of C, 0.30-1.00% of Si, 0.60-1.50% of Mn, 10.00-20.00% of Cr, 0.80-2.00% of Ni, 0.60-2.00% of Mo, less than or equal to 0.10% of S, less than or equal to 0.05% of P, and the balance of Fe and inevitable impurities. The working layer of the working roller of the temper mill is made ofthe cast-iron material, and has very strong wear resistance and very high hardness.

Description

technical field [0001] The invention relates to a tempering machine working roll, in particular to a cast iron tempering machine working roll. Background technique [0002] As the market has put forward higher requirements for the precision and surface quality of hot-rolled sheets, the leveling volume of the tempering machine has continued to increase, which requires the work rolls of the tempering machine to have stronger wear resistance and hardness. The currently used forged steel material There are certain problems in the working rolls, not only the machine cycle is short, the grinding amount of the lower machine is large, but also there are scale pits in use, which seriously restricts the efficiency of the tempering machine. Although the forged steel roll has high hardness, due to the There are no carbides in the steel, and the effect is not obvious only by the hardness of the matrix to improve the wear resistance and resist the pressure of the scale. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/08C22C37/04C21D9/38C21D5/00C21D1/18B22D19/16B22D13/02B21D1/02
CPCB21D1/02B22D13/02B22D19/16C21D1/18C21D5/00C21D9/38C22C37/04C22C37/08C22C37/10
Inventor 杨秀霞
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL