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A kind of preparation method of working roll of skin pass mill and skin pass mill

A technology of skin pass mill and work roll, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of reducing the toughness of rolls, achieve the effects of promoting movement, uniform distribution of nitrogen gas, and improving cryogenic quality

Active Publication Date: 2021-01-29
JIANGSU RUNFU MECHANICAL ROLL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical composition Cr content can improve the mechanical properties and wear resistance of steel, increase the hardness, elasticity, corrosion resistance and heat resistance of steel, and improve the hardenability of the surface; but at the same time, it reduces the toughness of the roll

Method used

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  • A kind of preparation method of working roll of skin pass mill and skin pass mill
  • A kind of preparation method of working roll of skin pass mill and skin pass mill
  • A kind of preparation method of working roll of skin pass mill and skin pass mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] According to weight ratio, carbon: 0.8wt%, silicon: 1.1wt%, manganese: 0.1wt%, phosphorus: 0.03wt%, sulfur: 0.02wt%, chromium: 5.4wt%, molybdenum: 0.4wt%, vanadium: 0.05wt% %, the balance is iron and other impurities, the residual copper content is not more than 0.2%, and other impurities such as lead, tin, arsenic, bismuth, etc. are not more than 0.02%, ready for casting materials.

[0041] Melting the alloy solution: according to the above weight ratio, put each component into an intermediate frequency induction furnace for melting, the melting temperature is 1700°C, and the melting time is 30 minutes to make an alloy solution.

[0042] Detection: Spectroscopic analysis is used to detect the smelted alloy liquid to ensure that its composition is within the range.

[0043] Casting cold billet: open the pour hole of the power frequency holding furnace, pour the alloy liquid into the metal mold, and remove the metal mold after it is completely cooled.

[0044] Washing a...

Embodiment 2

[0055] According to weight ratio, carbon: 1.1wt%, silicon: 0.4wt%, manganese: 0.4wt%, phosphorus: 0.01wt%, sulfur: 0.025wt%, chromium: 6.4wt%, molybdenum: 0.8wt%, vanadium: 0.25wt% %, the balance is iron and other impurities, the residual copper content is not more than 0.2%, and other impurities such as lead, tin, arsenic, bismuth, etc. are not more than 0.02%, ready for casting materials.

[0056] Melting the alloy solution: according to the above weight ratio, put each component into an intermediate frequency induction furnace for melting, the melting temperature is 1950°C, and the melting time is 40 minutes to make an alloy solution.

[0057] Detection: Spectroscopic analysis is used to detect the smelted alloy liquid to ensure that its composition is within the range.

[0058] Casting cold billet: open the pour hole of the power frequency holding furnace, pour the alloy liquid into the metal mold, and remove the metal mold after it is completely cooled.

[0059] Washing ...

Embodiment 3

[0069] According to the weight ratio, carbon: 1wt%, silicon: 0.95wt%, manganese: 0.15wt%, phosphorus: 0.02wt%, sulfur: 0.03wt%, chromium: 5.6wt%, molybdenum: 0.5wt%, vanadium: 0.1wt% , the balance is iron and other impurities, the residual copper content is not more than 0.2%, and other impurities such as lead, tin, arsenic, bismuth, etc. are not more than 0.02%, ready for casting materials.

[0070] Melting the alloy solution: according to the above weight ratio, put each component into an intermediate frequency induction furnace for melting, the melting temperature is 1950°C, and the melting time is 40 minutes to make an alloy solution.

[0071] Detection: Spectroscopic analysis is used to detect the smelted alloy liquid to ensure that its composition is within the range.

[0072] Casting cold billet: open the pour hole of the power frequency holding furnace, pour the alloy liquid into the metal mold, and remove the metal mold after it is completely cooled.

[0073] Washing...

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Abstract

The invention discloses a method for preparing work rolls of tempering mills and skin pass mills. After quenching, the rolls are put into a cryogenic treatment device, treated at -185 to -190°C, and supporting equipment is used; through precipitation tubes and The blowing device blows the nitrogen deposited at the bottom back into the cryogenic box, reducing the use of liquid nitrogen and promoting the movement of gas in the cryogenic box. By setting up the hood, while preventing the direct injection of liquid nitrogen, the nitrogen is also channeled, so that the nitrogen is more uniformly dispersed. In addition, the air inlet cylinder is driven to rotate through the driving device, and the nitrogen gas is introduced to the roll through the air inlet cylinder, so that the roll is cooled evenly and the cryogenic quality is improved; at the same time, an impeller is installed on the outer wall of the air inlet cylinder to borrow the driving force of the air inlet cylinder The impeller is rotated to promote the movement of the gas in the cryogenic box, so that the gas distribution is more uniform; and no additional power is required, which reduces the cost.

Description

technical field [0001] The invention relates to a roll and a preparation method thereof, in particular to a Cr5 type forged steel work roll for rolling extremely thin materials and a preparation method thereof. Background technique [0002] Skin pass mill and skin pass mill are mainly composed of row houses, machine bases, gates, rolls, hydraulic systems and other mechanisms. Among them, the roll is a tool used to roll the product, and it is the key to the whole rolling mill, using the pressure generated when a pair or a group of rolls roll to roll the steel. The roll is a frequently used tool in the workshop, and its quality directly affects the quality and output of steel. Therefore, the requirements for the performance of the roll (mainly strength, wear resistance and certain thermal crack resistance) are very strict. [0003] In practical application, the roll will produce residual stress and thermal stress in the preparation process before manufacture and use. When in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C33/04C21D6/04C21D9/38C21D1/18
CPCC21D1/18C21D6/04C21D9/38C22C33/04C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 蔡友根
Owner JIANGSU RUNFU MECHANICAL ROLL MFG
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