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Heat treatment method of non-ferrous metal hot roll

A heat treatment method and non-ferrous metal technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of product strength, wear resistance, low toughness, etc., achieve shortened quenching time, simple and easy heat treatment method, high hardness Effect

Active Publication Date: 2017-12-08
安徽昕悦铸造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the heat treatment of non-ferrous metal hot rolls has become particularly important. In order to further increase the service life of hot rolls and reduce the production cost of hot-rolled products, it is necessary to further improve and optimize the composition and processing technology of hot rolls. The problem of low product strength, wear resistance and toughness due to insufficient cooling is a common problem in heat treatment work, and the two are contradictory, and it is difficult to take care of them at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A heat treatment method for non-ferrous metal hot rolls is carried out according to the following steps:

[0025] (1) Preheating: After the rolls are demoulded and sand cleaned, the rolls are transported to a high-temperature furnace for preheating treatment. The temperature of the preheating treatment is 360°C, the heating rate is 10°C / min, and the preheating time is 20min;

[0026] The chemical composition and weight percentage of the above rolls are C: 0.60%, Si: 0.50%, Mn: 0.40%, Cr: 2.40%, Ni: 0.30%, Ti: 0.80%, Nb: 0.20%, P≤ 0.030%, S≤0.025%, the rest is Fe and unavoidable impurities;

[0027] (2) Secondary normalizing: transport the preheated rolls to a trolley-type normalizing furnace for normalizing treatment, first normalize the temperature to 560 ° C, keep it for 1 hour, then air cool to 420 ° C and keep it for 30 minutes; heat up again Carry out the second normalizing, raise the temperature to 720°C at a rate of 10°C / min, keep it warm for 2 hours, then air c...

Embodiment 2

[0032] A heat treatment method for non-ferrous metal hot rolls is carried out according to the following steps:

[0033] (1) Preheating: After the rolls are demolded and sand cleaned, the rolls are transported to a high-temperature furnace for preheating treatment. The temperature of the preheating treatment is 390°C, the heating rate is 15°C / min, and the preheating time is 25min;

[0034] The chemical composition and weight percentage of the above rolls are C: 0.80%, Si: 0.60%, Mn: 0.50%, Cr: 2.80%, Ni: 0.40%, Ti: 0.90%, Nb: 0.30%, P≤ 0.025%, S≤0.020%, the rest is Fe and unavoidable impurities;

[0035] (2) Secondary normalizing: transport the preheated rolls to a trolley-type normalizing furnace for normalizing treatment, first normalize the temperature to 570°C, keep it warm for 1.2h, then air cool to 430°C and keep it warm for 35min; Raise the temperature for the second normalizing, raise the temperature to 740°C at a rate of 15°C / min, keep it for 2.2 hours, then air cool...

Embodiment 3

[0040] A heat treatment method for non-ferrous metal hot rolls is carried out according to the following steps:

[0041](1) Preheating: After the rolls are demolded and sand cleaned, the rolls are transported to a high-temperature furnace for preheating treatment. The temperature of the preheating treatment is 390°C, the heating rate is 15°C / min, and the preheating time is 25min;

[0042] The chemical composition and weight percentage of the above rolls are C: 0.90%, Si: 0.70%, Mn: 0.60%, Cr: 3.10%, Ni: 0.50%, Ti: 1.00%, Nb: 0.40%, P≤ 0.020%, S≤0.015%, the rest is Fe and unavoidable impurities;

[0043] (2) Secondary normalizing: transport the preheated rolls to a trolley-type normalizing furnace for normalizing treatment, first normalize the temperature to 580°C, keep it warm for 1.5h, and then air cool to 440°C and keep it warm for 35min; Raise the temperature for the second normalizing, raise the temperature to 750°C at a rate of 15°C / min, keep it for 2.5 hours, then air c...

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Abstract

The invention discloses a heat treatment method of a non-ferrous metal hot roll, and relates to the technical field of metal processing. The method comprises the following steps: 1) preheating: the roll is placed in a high-temperature furnace for preheating treatment after being demolded and cleaned; 2) secondary normalization; 3) quenching: double-frequency induction quenching is performed on the working surface of the roll, and the cooling mode is a combination of oil cooling and air cooling; 4) tempering; 5) annealing. The heat treatment method of the non-ferrous metal hot roll is simple and feasible; the treated non-ferrous metal hot roll is high in strength and good in thermal cracking resistance and electrochemical corrosion resistance, and has excellent accident resistance, fatigue resistance and abrasion resistance, thereby meeting operating requirements of practical production and application; the service life of the non-ferrous metal hot roll is effectively prolonged, and production efficiency and economic benefits are increased.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a heat treatment method for nonferrous metal hot rolls. Background technique [0002] The roll is an important part of the rolling mill in the rolling mill and an important consumable part that determines the efficiency of the rolling mill and the quality of the rolled product. The rolls use the pressure generated by a pair or a group of rolls to roll the rolled piece, so that the rolled piece produces plastic deformation and obtains an ideal design shape. Therefore, the quality of the roll is directly related to the surface quality of the rolled product and the rolled steel. machine productivity. It is mainly subjected to dynamic and static loads, wear and temperature changes during rolling. [0003] According to different working conditions, rolls are usually divided into cold rolls and hot rolls. Among them, hot rolling rolls are usually used in the processing of b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C21D1/28C21D1/18C21D1/26C22C38/02C22C38/04C22C38/50C22C38/48
CPCC21D1/18C21D1/26C21D1/28C21D9/38C22C38/02C22C38/04C22C38/48C22C38/50
Inventor 华玲玲
Owner 安徽昕悦铸造科技有限公司
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