CN105296735B - A kind of roll differential temperature heat treatment method - Google Patents

A kind of roll differential temperature heat treatment method Download PDF

Info

Publication number
CN105296735B
CN105296735B CN201510705412.XA CN201510705412A CN105296735B CN 105296735 B CN105296735 B CN 105296735B CN 201510705412 A CN201510705412 A CN 201510705412A CN 105296735 B CN105296735 B CN 105296735B
Authority
CN
China
Prior art keywords
temperature
roll
heat treatment
warm
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201510705412.XA
Other languages
Chinese (zh)
Other versions
CN105296735A (en
Inventor
崔聪聪
梁俊良
杨静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinosteel Xingtai Machinery and Mill Roll Co Ltd
Original Assignee
Sinosteel Xingtai Machinery and Mill Roll Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinosteel Xingtai Machinery and Mill Roll Co Ltd filed Critical Sinosteel Xingtai Machinery and Mill Roll Co Ltd
Priority to CN201510705412.XA priority Critical patent/CN105296735B/en
Publication of CN105296735A publication Critical patent/CN105296735A/en
Application granted granted Critical
Publication of CN105296735B publication Critical patent/CN105296735B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a kind of roll differential temperature heat treatment method, it is related to technical field of heat treatment.The processing step of the heat treatment method includes technological preparation, warm-up phase, differential temperature warm-up phase, High-speed temperature rise period, soaking period.This method preheating temperature is low, its preheating temperature is 480~500 DEG C, constant temperature temperature before high-speed heating is 800~850 DEG C, high-speed heating section is by the way of stage heating, share 3 heating nodes, often reach a temperature nodes and be incubated 2 minutes, soak is carried out in two stages, and the soaking time in two stages is different with temperature.Using roll made from the heat treatment method of the present invention, there is higher uniformity of hardness, good core structure, and heat treatment energy consumption can be reduced, reduce enterprise's production cost.

Description

A kind of roll differential temperature heat treatment method
Technical field
The present invention relates to the differential temperature heat-treatment technology method of roll, it is related to technical field of heat treatment.
Background technology
The Technology for Heating Processing of current forging and casting large-scale backing roll is generally induction hardening process and differential quenching technique, Wherein induction hardening process is limited by heat penetration, is not suitable for making the deeper roll of working lining, is limited, sensed by coil Roll bad adaptability of the quenching technical to different cultivars.And differential quenching technique using flame heating by the way of, to ensure work Layer heat penetration reaches requirement, and traditional differential quenching technique preheating temperature is higher, and soaking time is longer, in order to increase as far as possible Heart table temperature difference, quick bringing-up section heat up at full speed, and temperature is inconsistent everywhere for roll when causing to be incubated, poor temperature uniformity.Rear It can cause hardness uneven during the quenching of phase, and because center portion constant temperature raises, cause core structure to change, cause comprehensive Closing mechanical property reduces, the anti-accident ability of roll during influence of rolled.Roll working life is low, whole heat treatment stages energy consumption wave Take the production cost for seriously, adding enterprise.
The content of the invention
It is an object of the invention to provide a kind of roll differential temperature heat treatment method, the temperature of roll is uniform when increase differential temperature is handled Property, and ensure that roll center portion has relatively low temperature.
To achieve the above object, the technical solution adopted in the present invention is：
A kind of roll differential temperature heat treatment method, the material of roll are Cr3, Cr4 or Cr5 one of which, at the heat of roll Reason includes following process steps：
1. technological preparation
Temperature thermocouple is installed on the roll barrel of required processing；
2. warm-up phase
Roll is integrally put into air furnace and preheated, preheating temperature is 480~500 DEG C；
3. differential temperature warm-up phase
After the completion of preheating, roll is put into differential temperature stove, 800~850 are heated to 15~20 DEG C/min heating rate ℃；
4. High-speed temperature rise period
High-speed temperature rise period sets three temperature nodes, and three temperature nodes are 900 DEG C, 950 DEG C and 1000 DEG C respectively, After the completion of the preheating of roll differential temperature, heated up with 20~25 DEG C/min heating rate, after roller surface temperature reaches each node 2min is incubated, 1050 DEG C is finally warming up to and enters next stage；
5. the soaking period
Soak is divided to two sections of progress, and the first stage is in 1050 DEG C of insulations, and second stage is incubated at 1000 DEG C, every section Soaking time determined by formula T=α × D；
In formula：T --- soaking time, unit min；
α --- heating coefficient, unit min/mm；
D --- roll working lining thickness, unit mm；
The heating coefficient α of first stage soaking time is 1.2min/mm, and the heating coefficient α of second stage soaking time is 0.8min/mm；
Cooling treatment is carried out after the completion of second stage insulation.
Further, the soaking time of warm-up phase is 10~15h.
Further, the soaking time of differential temperature warm-up phase is 10~15min.
Further, cooling treatment is after the completion of second stage soak, roll is hung out from differential temperature stove, then Carry out misting cooling.
After such scheme, have the advantages that compared with prior art：
The preheating temperature that the heat treatment method uses is relatively low, and center portion temperature can be made to be consistently lower than 650 DEG C；It is fast using segmentation The mode of speed heating simultaneously uses shorter soaking time, can make the control of roll barrel different parts temperature difference within 10 DEG C. So the roll being obtained by this method has higher uniformity of hardness, good core structure and comprehensive mechanical property.
Overall heating need not be carried out to roll using the heat treatment method, can make heat treatment energy consumption reduce by 20% with On, reduce the production cost of enterprise.
Embodiment
A kind of roll differential temperature heat treatment method, including following process steps：
A kind of roll differential temperature heat treatment method, the material of roll are Cr3, Cr4 or Cr5 one of which, at the heat of roll Reason includes following process steps：
1. technological preparation
Temperature thermocouple is installed on the roll barrel of required processing；
2. warm-up phase
Roll is integrally put into air furnace and preheated, preheating temperature is 480~500 DEG C；
3. differential temperature warm-up phase
After the completion of preheating, roll is put into differential temperature stove, 800~850 are heated to 15~20 DEG C/min heating rate ℃；
4. High-speed temperature rise period
High-speed temperature rise period sets three temperature nodes, and three temperature nodes are 900 DEG C, 950 DEG C and 1000 DEG C respectively, After the completion of the preheating of roll differential temperature, heated up with 20~25 DEG C/min heating rate, after roller surface temperature reaches each node 2min is incubated, 1050 DEG C is finally warming up to and enters next stage；
5. the soaking period
Soak is divided to two sections of progress, and the first stage is in 1050 DEG C of insulations, and second stage is incubated at 1000 DEG C, every section Soaking time determined by formula T=α × D；
In formula：T --- soaking time, unit min；
α --- heating coefficient, unit min/mm；
D --- roll working lining thickness, unit mm；
First stage soaking time heating coefficient α is 1.2min/mm, and second stage soaking time heating coefficient α is 0.8min/mm；
Cooling treatment is carried out after the completion of second stage insulation.
The present invention is described in further details with reference to embodiment：
Embodiment 1
The roll material of required heat treatment is Cr5, and specification is Φ 1500mm, and working lining requires thickness 75mm.
The Technology for Heating Processing of the present embodiment is as follows:
1. technological preparation, temperature thermocouple is installed on the roll barrel of required processing；
2. the roll for completing technological preparation is hung in air furnace, overall preheating is carried out, sets preheating temperature as 500 DEG C, When temperature thermocouple measured temperature reaches 500 DEG C of preset temperature, stop heating and thermal insulation 15h, insulation hangs out roll after terminating It is transported to differential temperature stove；
3. the roll for preheating completion is hung in differential temperature stove, starting constant temperature is first preheating to 15 DEG C/min heating rate 850 DEG C, then 900 DEG C are warming up to 25 DEG C/min heating rate, 2min is incubated, is warming up to 25 DEG C/min heating rate 950 DEG C, 2min is incubated, 1000 DEG C is warming up to 25 DEG C/min heating rate, 2min is incubated, with 25 DEG C/min heating rate 1050 DEG C are warming up to, insulation 90min (75 × 1.2=90), 5min are cooled to 1000 DEG C, insulation 60min (75 × 0.8=60), Then come out of the stove and carry out misting cooling, complete differential temperature heat treatment.
By the monitoring of temperature thermocouple, the actual maximum temperature difference of body of roll different parts is measured as 6 DEG C, is met the requirements.
Using punching thermometric and method for numerical simulation, it is 615 DEG C to determine center portion temperature, heat penetration 100mm, is reached Target.
Prior heat treatment method is contrasted, this energy consumption reduces 26%.
Embodiment 2
The roll material of required heat treatment is Cr4, and specification is Φ 1500mm, and working lining requires thickness 75mm.
The Technology for Heating Processing of the present embodiment is as follows:
1. technological preparation, temperature thermocouple is installed on the roll barrel of required processing；
2. the roll for completing technological preparation is hung in air furnace, overall preheating is carried out, sets preheating temperature as 500 DEG C, When temperature thermocouple measured temperature reaches 500 DEG C of preset temperature, stop heating and thermal insulation 15h, insulation hangs out roll after terminating It is transported to differential temperature stove；
3. the roll for preheating completion is hung in differential temperature stove, starting constant temperature is first preheating to 15 DEG C/min heating rate 850 DEG C, then 900 DEG C are warming up to 22 DEG C/min heating rate, 2min is incubated, is warming up to 23 DEG C/min heating rate 950 DEG C, 2min is incubated, 1000 DEG C is warming up to 24 DEG C/min heating rate, 2min is incubated, with 24 DEG C/min heating rate 1050 DEG C are warming up to, insulation 90min (75 × 1.2=90), 5min are cooled to 1000 DEG C, insulation 60min (75 × 0.8=60), Then come out of the stove and carry out misting cooling, complete differential temperature heat treatment.
By the monitoring of temperature thermocouple, body of roll different parts maximum temperature difference is measured as 5 DEG C, is met the requirements.
Using punching thermometric and method for numerical simulation, it is 620 DEG C to determine center portion temperature, heat penetration 95mm, is reached Target.
Prior heat treatment method is contrasted, this energy consumption reduces 24%.
Embodiment 3
The roll material of required heat treatment is Cr3, and specification is Φ 1200mm, and working lining requires thickness 65mm.
The Technology for Heating Processing of the present embodiment is as follows:
1. technological preparation, temperature thermocouple is installed on the roll barrel of required processing；
2. the roll for completing technological preparation is hung in air furnace, overall preheating is carried out, sets preheating temperature as 480 DEG C, When temperature thermocouple measured temperature reaches 480 DEG C of preset temperature, stop heating and thermal insulation 11h, insulation hangs out roll after terminating It is transported to differential temperature stove；
3. the roll for preheating completion is hung in differential temperature stove, starting constant temperature is first preheating to 15 DEG C/min heating rate 850 DEG C, then 900 DEG C are warming up to 20 DEG C/min heating rate, 2min is incubated, is warming up to 20 DEG C/min heating rate 950 DEG C, 2min is incubated, 1000 DEG C is warming up to 20 DEG C/min heating rate, 2min is incubated, with 20 DEG C/min heating rate 1050 DEG C are warming up to, insulation 78min (65 × 1.2=78), 5min are cooled to 1000 DEG C, insulation 52min (65 × 0.8=52), Then come out of the stove and carry out misting cooling, complete differential temperature heat treatment.
By the monitoring of temperature thermocouple, body of roll different parts maximum temperature difference is measured as 5 DEG C, is met the requirements.
Using punching thermometric and method for numerical simulation, it is 620 DEG C to determine center portion temperature, heat penetration 92mm, is reached Target.
Prior heat treatment method is contrasted, this energy consumption reduces 25%.

Claims (2)

  1. A kind of 1. roll differential temperature heat treatment method, it is characterised in that：The material of roll is Cr3, Cr4 or Cr5 one of which, is rolled The heat treatment of roller includes following process steps：
    1. technological preparation
    Temperature thermocouple is installed on the roll barrel of required processing；
    2. warm-up phase
    Roll is integrally put into air furnace and preheated, preheating temperature is 480 DEG C, the soaking time of warm-up phase for 10~ 15h；
    3. differential temperature warm-up phase
    After the completion of preheating, roll is put into differential temperature stove, 800~850 DEG C are heated to 15~20 DEG C/min heating rate, it is poor The soaking time of warm warm-up phase is 10~15min；
    4. High-speed temperature rise period
    High-speed temperature rise period sets three temperature nodes, and three temperature nodes are 900 DEG C, 950 DEG C and 1000 DEG C respectively, are being rolled After the completion of the preheating of roller differential temperature, heated up with 20~25 DEG C/min heating rate, roller surface temperature is incubated after reaching each node 2min, finally it is warming up to 1050 DEG C and enters next stage；
    5. the soaking period
    Soak is divided to two sections of progress, and the first stage is in 1050 DEG C of insulations, and second stage is in 1000 DEG C of insulations, every section of guarantor The warm time is determined by formula T=α × D；
    In formula：T --- soaking time, unit min；
    α --- heating coefficient, unit min/mm；
    D --- roll working lining thickness, unit mm；
    The heating coefficient α of first stage soaking time is 1.2min/mm, and the heating coefficient α of second stage soaking time is 0.8min/mm；
    Cooling treatment is carried out after the completion of second stage insulation.
  2. A kind of 2. roll differential temperature heat treatment method according to claim 1, it is characterised in that：Cooling treatment is in second-order After the completion of section soak, roll is hung out from differential temperature stove, then carries out misting cooling.
CN201510705412.XA 2015-10-27 2015-10-27 A kind of roll differential temperature heat treatment method Active CN105296735B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510705412.XA CN105296735B (en) 2015-10-27 2015-10-27 A kind of roll differential temperature heat treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510705412.XA CN105296735B (en) 2015-10-27 2015-10-27 A kind of roll differential temperature heat treatment method

Publications (2)

Publication Number Publication Date
CN105296735A CN105296735A (en) 2016-02-03
CN105296735B true CN105296735B (en) 2018-01-05

Family

ID=55194551

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510705412.XA Active CN105296735B (en) 2015-10-27 2015-10-27 A kind of roll differential temperature heat treatment method

Country Status (1)

Country Link
CN (1) CN105296735B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114150138B (en) * 2021-11-05 2023-08-11 宝钢轧辊科技有限责任公司 Method for processing differential heating interruption of large forged steel supporting roller

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102352431A (en) * 2011-10-17 2012-02-15 中钢集团邢台机械轧辊有限公司 Large-scale high-chrome cast iron roller permissible differential temperature heat treatment
CN103436679A (en) * 2013-07-30 2013-12-11 中钢集团邢台机械轧辊有限公司 Differential temperature heat treatment method of minor-diameter high chromium cast-iron roll

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103572033B (en) * 2012-08-07 2015-06-24 上海重型机器厂有限公司 Thermal treatment method of wide and thick plate supporting roll
CN102925656A (en) * 2012-11-22 2013-02-13 宝钢集团常州轧辊制造公司 Preheating treatment method for supporting roller
CN104775009A (en) * 2014-01-14 2015-07-15 宝山钢铁股份有限公司 Heating method during quenching of large supporting roller

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102352431A (en) * 2011-10-17 2012-02-15 中钢集团邢台机械轧辊有限公司 Large-scale high-chrome cast iron roller permissible differential temperature heat treatment
CN103436679A (en) * 2013-07-30 2013-12-11 中钢集团邢台机械轧辊有限公司 Differential temperature heat treatment method of minor-diameter high chromium cast-iron roll

Also Published As

Publication number Publication date
CN105296735A (en) 2016-02-03

Similar Documents

Publication Publication Date Title
CN101698902B (en) Quenching method for integral cast steel supporting roll
CN105779716A (en) Heat treatment process for bearing steel
CN105543459B (en) A kind of compound process for quenching of Cr12MoV rolls
CN105296735B (en) A kind of roll differential temperature heat treatment method
CN106916923B (en) The synchronous heat treatment process of more durometer rollers
CN102115812B (en) Prompt tempering heat treatment method for Q690D steel
CN105695701A (en) 40Cr quenching and tempering technology
CN101892374B (en) Method for performing heat treatment on high-hardness semisteel roll
CN107988479A (en) A kind of quasi- differential temperature heat treatment method of large scale roll
CN107675123A (en) A kind of high-speed steel carburizing quenching process
CN104313292A (en) Differential temperature heat treatment method of D2 steel centrifugal composite roller
CN105087891A (en) Induction quenching preheating method for increasing depth of hardening layer of cold roll
CN110642508A (en) Annealing process for glass tableware
CN106367579A (en) Quenching technology of sheet milling cutter
CN110295280A (en) A kind of sprue bush processing renovation technique
CN104846157A (en) Novel tempering technology for high-precision high-speed heavy-duty gear salt bath quenching
CN107746912A (en) Metalwork anti-deformation Technology for Heating Processing
CN103290179B (en) Thermal treatment method for medium carbon structural alloy steel with low hardenability
CN103468896A (en) Vacuum quenching and cooling method of H13 steel
CN107641705A (en) A kind of Technology for Heating Processing of steel rolling ring forging
CN106319187A (en) Knurling roll quenching method
CN106755789A (en) The Technology for Heating Processing of rich chromium cast iron
CN105819676A (en) Continuous annealing technology of glass tableware
CN105750463A (en) Forging technique for bearing steel
CN104357631A (en) Heat treatment method for eliminating 300M steel macrostructure defects

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant