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
View PDF0 Cites 3 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Improved nodular cast iron rail finishing roll and production method thereof

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap