Heat treatment method of M2 high-speed steel work roller

A heat treatment method and work roll technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of quenching oil fire hazards, large oil pollution on the surface of the rolls, and high labor intensity of operators, so as to improve the quenching stress state, improve the Heat utilization rate, effect of reducing cracking phenomenon

Inactive Publication Date: 2019-03-12
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the traditional process, most M2 high-speed steel shafts are quenched in a salt bath furnace. Generally, a low-temperature box furnace is required for primary preheating, a salt bath furnace is used for secondary preheating, and a high-temperature salt bath furnace is quenched and heated. ; At present, the total length of the working rolls continues to increase by 1400 ~ 2480mm. The original small salt bath furnace (length 600mm) cannot meet the heating needs, and the working environment such as slag removal, high temperature salt and borax needs to be carried out during the use of the salt bath furnace. The waste gas generated by the polluted environment such as melting affects the physical and mental health of employees; the labor intensity of the operators is high, and the heating salt bath furnace takes a long time to start and the efficiency is low; the entire operation cycle is long and the energy consumption is high; High cost, low efficiency, not suitable for continuous quenching of rolls with multiple batches, multiple specifications and large batches
After quenching with quenching oil, the surface of the roll is heavily oily, and tempering produces fumes, polluting the environment, and quenching oil causes fire hazards, which are not suitable for safety and environmental protection requirements

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The diameter of the M2 high speed steel work roll in this embodiment is 40.5m. The equipment used includes well-type resistance furnace and hot air circulation tempering furnace. The following is the specific heat treatment process:

[0038] 1) One-time preheating: hang the roll on the sling and vertically hoist it into the well-type resistance furnace, raise the temperature in the well-type resistance furnace to 520°C at a rate of 80°C / h and keep it warm; the holding time is 1h;

[0039] 2) Secondary preheating: continue heating the roll to 830°C at a rate of 120°C / h and keep it warm; the hold time is 1h;

[0040] 3) High temperature heating: raise the roll to 1180°C at a speed of 65°C / h, and keep it warm; the hold time is 30min;

[0041] 4) Cooling: The rolls heated at high temperature and kept warm are cooled by water-based quenching liquid, the rolls are vertically placed in the water-based quenching liquid, and the rolls are cooled to 330°C;

[0042] 5) Temperin...

Embodiment 2

[0045] The diameter of the M2 high speed steel work roll in this embodiment is 83m. The equipment used includes well-type resistance furnace and hot air circulation tempering furnace. The following is the specific heat treatment process:

[0046] 1) One-time preheating: Hang the roll on the sling and vertically hoist it into the well-type resistance furnace, raise the temperature in the well-type resistance furnace to 560°C at a rate of 70°C / h and keep it warm; the holding time is 2h;

[0047] 2) Secondary preheating: continue heating the roll to 865°C at a rate of 110°C / h and keep it warm; the hold time is 2h;

[0048] 3) High-temperature heating: raise the roll to 1200°C at a speed of 60°C / h, and keep warm; the hold time is 65min;

[0049] 4) Cooling: The rolls heated at high temperature and kept warm are cooled by water-based quenching liquid, the rolls are vertically placed in the water-based quenching liquid, and the rolls are cooled to 365°C;

[0050] 5) Tempering tre...

Embodiment 3

[0053] The diameter of the M2 high speed steel work roll in this embodiment is 58m. The equipment used includes well-type resistance furnace and hot air circulation tempering furnace. The following is the specific heat treatment process:

[0054] 1) One-time preheating: Hang the roll on the sling and vertically hoist it into the well-type resistance furnace, raise the temperature in the well-type resistance furnace to 500°C at a rate of 100°C / h and keep it warm; the holding time is 0.5h;

[0055] 2) Secondary preheating: continue heating the roll to 800°C at a rate of 50°C / h and keep it warm; the hold time is 0.5h;

[0056] 3) High temperature heating: raise the roll to 1150°C at a speed of 50°C / h, and keep it warm; the hold time is 10 minutes;

[0057] 4) Cooling: The rolls heated at high temperature and kept warm are cooled by water-based quenching liquid, the rolls are vertically placed in the water-based quenching liquid, and the rolls are cooled to 300°C;

[0058] 5) 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 a heat treatment method of an M2 high-speed steel work roller, and belongs to the technical field of roller heat treatment. The method comprises the following process steps of(1) primary preheating, wherein the roller is heated by a heat treatment furnace at the speed ranging from 50 DEG C / h to 200 DEG C / h till the temperature ranges from 500 DEG C to 600 DEG C, and heatpreservation is carried out; (2) secondary preheating, wherein the roller continues to be heated at the speed ranging from 50 DEG C / h to 200 DEG C / h till the temperature ranges from 800 DEG C to 900 DEG C, and heat preservation is carried out; (3) high-temperature heating, wherein the roller is heated at the speed ranging from 50 DEG C / h to 100 DEG C / h till the temperature ranges from 1140 DEG C to 1210 DEG C, and heat preservation is carried out; (4) cooling, wherein the roller subjected to high-temperature heating and heat preservation is cooled by a water-based quench bath, the roller is vertically placed into the water-based quench bath to be cooled till the temperature ranges from 300 DEG C to 400 DEG C; and (5) tempering treatment, wherein the cooled roller is heated till the temperature ranges from 540 DEG C to 560 DEG C, after heat preservation is carried out for 3 h to 10 h, air cooling is carried out to room temperature, and tempering treatment is carried out several times. By means of the heat treatment method, the quenching stress state can be improved, and the quenching quality can be guaranteed.

Description

technical field [0001] The invention relates to a heat treatment method for M2 high-speed steel work rolls, and belongs to the technical field of roll heat treatment. Background technique [0002] With the continuous development of my country's national economy, structural adjustment of the iron and steel industry and the advancement of science and technology, rolling cold-rolled stainless steel strips, silicon steel strips, precision alloy strips, high-temperature insoluble alloy strips, rare alloy strips, and high-precision ultra-thin cold-rolled carbon The number of multi-roll mills for plain steel strips and non-ferrous metal (foil) strips has gradually increased, which has promoted the rapid development and wide application of multi-roll mills. [0003] Multi-roll rolling mills include six-high rolling mills, partial eight-high rolling mills, twelve-high rolling mills, eighteen-high rolling mills, twenty-high rolling mills, etc. Among them, twenty-high rolling mills (Sen...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C21D1/18C21D3/04
CPCC21D1/18C21D3/04C21D9/38
Inventor 王春祥曹文娟刘士峰
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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