CN114032364A - Roller surface heat treatment process made of EN-9 - Google Patents
Roller surface heat treatment process made of EN-9 Download PDFInfo
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- CN114032364A CN114032364A CN202111328278.8A CN202111328278A CN114032364A CN 114032364 A CN114032364 A CN 114032364A CN 202111328278 A CN202111328278 A CN 202111328278A CN 114032364 A CN114032364 A CN 114032364A
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- quenching
- hardness
- roller
- heat treatment
- treatment process
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010791 quenching Methods 0.000 claims abstract description 79
- 230000000171 quenching effect Effects 0.000 claims abstract description 79
- 238000005496 tempering Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000004321 preservation Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000007542 hardness measurement Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000013462 industrial intermediate Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a roller surface heat treatment process with EN-9 material, the hardness of the roller is 35-45HSD by quenching and tempering heat treatment before quenching, the preheating temperature is selected to be 350-450 ℃, the heat preservation time is 12-16h, after the preheating and heat preservation stage is finished, an 50/250HZ double-frequency quenching machine tool is used for surface heating quenching, the heating temperature is selected to be 860-870 ℃ during quenching, the 50HZ quenching power is maintained to be 510 +/-10 KW, the 250HZ quenching power is maintained to be 210 +/-10 KW, the reduction speed is 0.8-1.0mm/s, the rotating speed is selected to be 35-40r/min, the quenching water pressure is maintained to be 0.8-0.9MPa, and the total quenching time is 50 +/-5 min; after quenching, carrying out continuous cooling in a water tank, and finishing the quenching process after the continuous cooling is carried out for 80 +/-10 min; after quenching, the hardness of the roller body is 75-80HSD, and tempering temperature is selected to be 300 +/-10 ℃ to temper to finish the surface heat treatment process; after heat treatment, the hardness of the roller body reaches 45-50HSD, the roller quality is good, the hardness uniformity is within 1.5HSD and is higher than that of integrally quenched and tempered 3HSD, and the accident resistance is good.
Description
Technical Field
The invention relates to a roller surface heat treatment process made of EN-9, in particular to a roller surface heat treatment process which utilizes 50HZ/250HZ double-frequency quenching equipment to meet the quality requirement of 45-50HSD for roller body hardness and obtain EN-9 with hardness uniformity within 1.5HSD, and belongs to the technical field of heat treatment.
Background
The EN-9 roller material comprises the following components: 0.50-0.60 percent of C, less than or equal to 0.40 percent of Si, and the weight ratio of Mn: 0.50-0.80, Cr is less than or equal to 0.30, P: less than or equal to 0.035, S: less than or equal to 0.035 wt% of Ni and less than or equal to 0.30 wt% of Ni. The material composition is similar to domestic 55# steel. The material roller is mainly used for rough rolling R1 frames of rolling mills abroad, and the domestic R1 rough rolling frames are all composite casting rollers, most of which are formed by centrifugal casting and compounding, and aims to meet the requirements of the rolling mills on the obdurability of the roller and the requirements of rolling conditions on the thermal crack resistance, the wear resistance and the spalling resistance of the surface of the roller. The production cycle of the composite roller is long. The EN-9 roller is generally subjected to integral tempering, heated to 840 ℃ at 810-. And in order to meet the hardness of the roller body, the hardness of the core part is the same as that of the roller body, so that the toughness of the core part is reduced, the accident resistance is poor in use, and the service life is shortened.
The EN-9 material is used as a forged steel roller and applied to a rough rolling stand. Based on 50HZ/250HZ equipment, the technology of industrial intermediate frequency heating and water quenching is adopted, the requirements of different hardness of a roll neck and a roll body of the roll are met, the roll diameter is required to be 35-45HSD, the roll body is required to be 45-50HSD, the hardness uniformity is controlled within 1.5HSD, and the purpose of improving the service performance is achieved.
Disclosure of Invention
The invention aims to meet the requirements of different hardness of the EN-9 roller body and the roller diameter of a forged steel roller and improve the use performance, and provides a heat treatment process for the EN-9 roller surface based on 50/250HZ quenching equipment.
The technical scheme of the invention is realized as follows: a roll surface heat treatment process with EN-9 material utilizes 50/250HZ dual-frequency quenching equipment to realize the heat treatment process which meets the quality requirements of different hardness of the roll body and the roll diameter of the roll, and the hardness uniformity of the roll with the material is improved by adjusting the process parameters and combining with the equipment characteristics through completing the quenching process, and the specific steps are as follows:
step 1), before the roller is quenched, the hardness of the roller reaches 35-45HSD through quenching and tempering heat treatment, the preheating temperature is selected to be 350-450 ℃, the heat preservation time is selected to be 12-16h, and the reduction of the surface temperature is small during quenching while the hardness of a matrix is not changed;
step 2), after the preheating and heat preservation stage is finished, carrying out surface heating quenching by using an 50/250HZ double-frequency quenching machine tool, wherein the heating temperature is 860 ℃ and 870 ℃ during quenching, the 50HZ quenching power is maintained at 510 +/-10 KW, the 250HZ quenching power is maintained at 210 +/-10 KW, the reduction speed is 0.8-1.0mm/s, the rotating speed is 35-40r/min, the quenching water pressure is maintained at 0.8-0.9MPa, and the total quenching time is 50 +/-5 min; the quenching medium is water;
step 3), after quenching, carrying out continuous cooling in a water tank, and finishing the quenching process after the continuous cooling is carried out for 80 +/-10 min;
step 4), after quenching, the hardness of the roller body reaches 75-80HSD, and tempering is carried out at the tempering temperature of 300 +/-10 ℃ to finish the surface heat treatment process;
and 5) equally dividing 4 buses, detecting that the hardness of the roller body reaches 45-50HSD, and verifying the hardness value and the hardness uniformity.
The hardness uniformity of the quenched rolled material is within 1.5 HSD.
The invention has the following advantages: 1) the manufacturing of products with different requirements on the roll diameter of the roll body can be realized by utilizing the characteristic of an 50/250HZ double-frequency quenching machine tool; 2) the roller made of EN-9 is quenched in a double-frequency surface induction heating and water cooling mode for the first time, the quenching depth is higher than the conventional water critical through-hardening value, the hardening layer depth is improved, and the service life of the roller is prolonged; 3) the quality of the quenched roller is good, the uniformity of hardness is within 1.5HSD, which is higher than that of integrally quenched and tempered 3HSD, and the hardness stability and the accident resistance are good.
Drawings
FIG. 1 is a schematic diagram of the hardness requirements of the EN-9 roller.
FIG. 2 is a distribution diagram of surface hardness detection points after 50/250HZ quenching according to the present invention.
FIG. 3 is a schematic diagram of the distribution of 50/250HZ quenched surface hardness test 4 bus bars.
The labels in the figures are: 1-roll diameter hardness requirement 35-45 HSD; 2-roll body hardness requirement 45-50 HSD.
Detailed Description
Example 1: as shown in fig. 1, 2 and 3, the process result is verified in the quenching process of using phi 510 x 1400 x 2289 material as the EN-9 roller.
Step 1), before roller quenching, quenching and tempering heat treatment is carried out, the hardness reaches 35-45HSD, namely the overall hardness is 35-45HSD, the preheating temperature is selected to be 400 +/-10 ℃, the heat preservation time is selected to be 16h, and the reduction of the surface temperature is small during quenching while the hardness of a matrix is not changed;
step 2), after the preheating and heat preservation stage is finished, performing surface heating quenching on an 50/250HZ dual-frequency quenching machine tool, wherein the heating temperature is 860 ℃ and 870 ℃ during quenching, the 50HZ quenching power is maintained at 510 +/-10 KW, the 250HZ quenching power is maintained at 210 +/-10 KW, the reduction speed is 0.8-1.0mm/s, the rotating speed is 35-40r/min, the quenching water pressure is maintained at 0.8-0.9MPa, and the total quenching time is 50 +/-5 min; the quenching medium is water;
and 3) after quenching, carrying out continuous cooling in a water tank, and finishing the quenching process after the continuous cooling is carried out for 80 +/-10 min.
And 4) finally, according to the drawing requirements (roller body hardness: 45-50 HSD), selecting proper tempering temperature (300 +/-10 ℃) for tempering, and finishing the surface heat treatment process;
and 5) equally dividing 4 buses, and detecting the hardness of the roller body. And (5) verifying hardness values and hardness uniformity.
The hardness uniformity of the quenched rolled material is within 1.5 HSD.
The roll diameter of the roll made of the material is subjected to quenching and tempering heat treatment, the hardness reaches 35-45HSD, and the heat treatment of the roll body utilizes 50/250HZ double-frequency quenching equipment to realize surface quenching, so that the hardness requirement of 45-50HD is met. Finally, the use requirement is met. Quenching the roller body on 50/250HZ equipment, wherein the roller needs to be wholly preheated before quenching, the preheating temperature is selected to be 350-450 ℃, and the heat preservation time is selected to be 12-16 h. And after the preheating and heat preservation stage is finished, quenching the roll body on 50/250HZ equipment. Considering the problem of large heat dissipation of surface quenching, the quenching temperature is selected to be 820-. The quenching water pressure is controlled to be 0.8MPa, the quenching water pressure of the conventional material is 0.22-0.28MPa, and the water quenching cracking risk of the material is reduced; the descending speed is selected to be 0.8-1.0mm/s, and the rotating speed is selected to be 35-40r/min, so that the hardness uniformity of the roller after quenching is improved; after quenching, the roller is subjected to hardness initial inspection (the hardness value is 75-80 HSD), and then is directly subjected to tempering treatment. The tempering temperature is selected according to the hardness after quenching, and is within the range of 300-500 ℃.
The roll body hardness measurements were performed at 5 points and 4 generatrix distribution as shown in fig. 2 and 3, and the surface hardness after 50/250HZ quenching was compared with the bulk quenched and tempered hardness measurement data. The hardness uniformity after the whole quenching and tempering is about 3HSD, and the hardness uniformity after the 50/250HZ quenching is within 1.5 HSD.
Hardness test after integral tempering
Claims (2)
1. A roller surface heat treatment process made of EN-9 is characterized by comprising the following steps: the heat treatment process which meets the quality requirements of different hardness of the roller body and the roller diameter is realized by using 50/250HZ double-frequency quenching equipment, the hardness uniformity of the roller made of the material is improved by completing the quenching process by adjusting process parameters and combining with the equipment characteristics, and the specific steps are as follows:
step 1), before the roller is quenched, the hardness of the roller reaches 35-45HSD through quenching and tempering heat treatment, the preheating temperature is selected to be 350-450 ℃, the heat preservation time is selected to be 12-16h, and the reduction of the surface temperature is small during quenching while the hardness of a matrix is not changed;
step 2), after the preheating and heat preservation stage is finished, carrying out surface heating quenching by using an 50/250HZ double-frequency quenching machine tool, wherein the heating temperature is 860 ℃ and 870 ℃ during quenching, the 50HZ quenching power is maintained at 510 +/-10 KW, the 250HZ quenching power is maintained at 210 +/-10 KW, the reduction speed is 0.8-1.0mm/s, the rotating speed is 35-40r/min, the quenching water pressure is maintained at 0.8-0.9MPa, and the total quenching time is 50 +/-5 min; the quenching medium is water;
step 3), after quenching, carrying out continuous cooling in a water tank, and finishing the quenching process after the continuous cooling is carried out for 80 +/-10 min;
step 4), tempering the roller body with the hardness of 75-80HSD after quenching at the tempering temperature of 300 +/-10 ℃ to finish the surface heat treatment process;
and 5) equally dividing 4 buses, detecting that the hardness of the roller body reaches 45-50HSD, and verifying the hardness value and the hardness uniformity.
2. The heat treatment process for the surface of a roller made of EN-9 as claimed in claim 1, wherein the heat treatment process comprises the following steps: the hardness uniformity of the roller after heat treatment is within 1.5 HSD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328278.8A CN114032364A (en) | 2021-11-10 | 2021-11-10 | Roller surface heat treatment process made of EN-9 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111328278.8A CN114032364A (en) | 2021-11-10 | 2021-11-10 | Roller surface heat treatment process made of EN-9 |
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| CN114032364A true CN114032364A (en) | 2022-02-11 |
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| CN202111328278.8A Pending CN114032364A (en) | 2021-11-10 | 2021-11-10 | Roller surface heat treatment process made of EN-9 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011665A (en) * | 2016-05-23 | 2016-10-12 | 重集团常州华冶轧辊有限公司 | Finish-rolling working roller made of new material and used for large aluminum hot mill and induction quenching method of finish-rolling working roller |
| CN109609728A (en) * | 2018-10-30 | 2019-04-12 | 河南中原特钢装备制造有限公司 | A kind of support roll surface heat treatment process |
| CN112522501A (en) * | 2020-12-02 | 2021-03-19 | 河南中原特钢装备制造有限公司 | Annealing process of surface quenching interrupted roller made of Cr3 or Cr5 |
-
2021
- 2021-11-10 CN CN202111328278.8A patent/CN114032364A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011665A (en) * | 2016-05-23 | 2016-10-12 | 重集团常州华冶轧辊有限公司 | Finish-rolling working roller made of new material and used for large aluminum hot mill and induction quenching method of finish-rolling working roller |
| CN109609728A (en) * | 2018-10-30 | 2019-04-12 | 河南中原特钢装备制造有限公司 | A kind of support roll surface heat treatment process |
| CN112522501A (en) * | 2020-12-02 | 2021-03-19 | 河南中原特钢装备制造有限公司 | Annealing process of surface quenching interrupted roller made of Cr3 or Cr5 |
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Application publication date: 20220211 |