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Improved nodular cast iron rail finishing roll and production method thereof

A production method and improved technology, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems affecting rolling efficiency and rolling precision, large hardness drop, roll failure, etc., to achieve easy promotion and use, The effect of reducing the hardness drop and prolonging the service life

Pending Publication Date: 2019-09-24
常州市中宇合金轧辊厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rolling under deep pass, there is a large difference in hardness, and it is easy to produce thermal cracks, which will seriously affect the rolling efficiency and the precision of the rolled piece, and often cause the roll to fail early

Method used

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  • Improved nodular cast iron rail finishing roll and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] A production method of an improved nodular cast iron rail finishing roll, comprising the following steps: S1, optimizing the chemical composition: C: 3.20%; Si: 1.45%; Mn: 0.55%; P: 0.01%; S: 0.01%; Cr : 0.75%; Ni: 2.80%; Mo: 0.50%; V: 0.20%; Re: 0.05%; Mg: 0.05%; S: 0.01%; Ni: 2.30%; the rest is according to the requirements of finished products; the temperature of tap iron is controlled at 1410°C during spheroidizing treatment; NiMg spheroidizing agent 7kg / t+yttrium-based heavy rare earth 3kg / t is used; CaBa inoculant is used for inoculation treatment, Add Si3.5 kg / t in the bag and calm down for 8 minutes after inoculation; S3, during pouring, the temperature is controlled at 1290 °C; instantaneous inoculation during pouring, add Si0.5 kg / t, and quickly pour 5t / min; S4, after pouring After cooling to normal temperature, it is turned into a finished product by turning.

Embodiment 2

[0021] Embodiment 2: A production method of an improved nodular cast iron rail finishing roll, comprising the following steps: S1, optimizing the chemical composition: C: 3.30%; Si: 1.55%; Mn: 0.65%; P: 0.02%; S: 0.02%; Cr: 0.80%; Ni: 3.00%; Mo: 0.55%; V: 0.25%; Re: 0.10%; Mg: 0.06%; Ni: 0.02%; S: 0.02%; Ni: 2.35%; the rest is according to the requirements of finished products; the tapping temperature is controlled at 1420°C during spheroidizing treatment; NiMg spheroidizing agent 7kg / t+yttrium-based heavy rare earth 3.3 kg / t; inoculation treatment Use CaBa inoculant, add Si3.5 kg / t in the bag and calm down for 8 minutes after inoculation; S3, when pouring, the temperature is controlled at 1295 °C; instantaneous inoculation during pouring, add Si0.5 kg / t, and quickly pour 5t / min ; S4, after pouring and cooling to normal temperature, it is processed into finished product 2 by turning.

Embodiment 3

[0023] A production method of an improved nodular cast iron rail finishing roll, comprising the following steps: S1, optimizing the configuration chemical composition: C: 3.40%; Si: 1.65%; Mn: 0.75%; P: 0.03%; S: 0.025%; Cr : 0.85%; Ni: 3.20%; Mo: 0.60%; V: 0.30%; Re: 0.15%; Mg: 0.08%; S: 0.025%; Ni: 2.40%; the rest is according to the finished product requirements; the tap temperature is controlled at 1430°C during spheroidizing treatment; NiMg spheroidizing agent 7kg / t+yttrium-based heavy rare earth 3.5 kg / t is used; CaBa inoculant is used for inoculation treatment , add Si3.5 kg / t in the bag and sedate for 8 minutes after inoculation; S3, during pouring, the temperature is controlled at 1300 °C; instantaneous inoculation during pouring, add Si0.5 kg / t, rapid pouring 5t / min; S4, pouring Finally, after cooling to normal temperature, it is turned into a finished product through turning.

[0024] The finished products processed by the above-mentioned 3 production methods are t...

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Abstract

The invention relates to the technical field of finishing rolls, in particular to an improved nodular cast iron rail finishing roll and a production method of the improved nodular cast iron rail finishing roll. The improved nodular cast iron rail finishing roll is provided with a stepped roll body. An upper roll neck is fixed to the upper end of the roll body. A lower roll neck is fixed to the lower end of the roll body. A transmission end is fixed to the lower end of the lower roll neck. According to the improved nodular cast iron rail finishing roll and the production method of the improved nodular cast iron rail finishing roll, the density and red hardness of the roll are greatly improved, the impact toughness and the thermal crack resistance are high, the hardness drop is reduced, and the service life of the roll is prolonged. The production method is simple, the process is reasonable, and wide popularization and use can be conveniently realized.

Description

technical field [0001] The invention relates to the technical field of finishing rolls, in particular to an improved nodular cast iron rail finishing roll and a production method thereof. Background technique [0002] Modern steel rails, such as light rails for mining railways, heavy rails for freight railways, and crane rails for factory cranes, have more and more varieties, and the precision and rigidity are becoming more and more demanding. Most of them are made of pearlitic ductile iron. The finishing rolls of this kind of material have high carbide content and sometimes have a network shape. Rolling under the deep pass type has a large hardness drop and is prone to thermal cracks, which will seriously affect the rolling efficiency and the precision of the rolled piece, and often cause the roll to fail early. Contents of the invention [0003] The technical problem to be solved by the present invention is: in order to solve the problems existing in the above-mentione...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C37/08C22C33/08C21C1/10B21B27/02
CPCC22C37/10C22C37/04C22C37/08C22C33/08C21C1/10B21B27/02
Inventor 许峰许阿平蒋志芳
Owner 常州市中宇合金轧辊厂
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