CN105018704A - Wear-resistant steel rod and production method thereof - Google Patents
Wear-resistant steel rod and production method thereof Download PDFInfo
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- CN105018704A CN105018704A CN201510506550.5A CN201510506550A CN105018704A CN 105018704 A CN105018704 A CN 105018704A CN 201510506550 A CN201510506550 A CN 201510506550A CN 105018704 A CN105018704 A CN 105018704A
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Abstract
The invention provides a wear-resistant steel rod and a production method thereof, and belongs to the field of heat treatment of metal. The wear-resistant steel rod is prepared through quenching and self tempering of a rolled steel rod. The organization structure of the steel rod sequentially comprises a first decarburized layer with the thickness ranging from 0.2 mm to 0.3 mm, a second quenching martensite layer with the thickness ranging from 0.8 mm to 1.0 mm, a third layer with the thickness accounting for 30% to 36 of the radius of the steel rod, a fourth layer with the thickness accounting for 30% to 36% of the radius of the steel rod and a fifth layer composed of bainite plus needle-shaped martensite and very small amount of pearlite from the surface to the central portion, wherein the third layer is composed of tempering martensite and a small amount of bainite, and the fourth layer is composed of tempered martensite and bainite gradually increased along the core. The production method comprises the steps of heating, quenching and self tempering.
Description
Technical field
The invention belongs to metal heating processing technology field, be specifically related to a kind of rod mill grinding rod iron, also relate to the production method of this rod iron simultaneously.
Background technology
Rod mill, because of in cylindrical shell load grinding element and be rod iron and gain the name, be a kind of application industrial grinding plant widely.In process of lapping, rod iron is thus lifted to certain altitude under the effect of centrifugal force and frictional force, and fall in leaving or let out state, treat that ore grinding thing enters inner barrel continuously by mine inlet, the rod iron of passive movement pulverized, and forms ore pulp.While comminution of minerals, rod iron self is also by continuous attrition.Therefore, for making rod mill stably work, need to add new rod iron in time.
At present, market mostly is steel mill's steel rolling rod iron for the grinding rod iron of rod mill, and its abrasion resistant effect is poor, and consumption is very large, causes the great wasting of resources.Meanwhile, the frotton life-span is short also can bring following problems: 1) add excellent frequency high, brings heavy work burden, too increase the labor cost of enterprise to workman; 2) frotton residue enters in ore pulp as impurity, affects ore pulp quality; 3) the frotton residue taken away by ore pulp can further wear equipment, reduces service life of equipment.Therefore, a kind of more wear-resisting, frotton that the life-span is longer is urgently developed in this area.
Summary of the invention
The object of the invention is to provide a kind of wear-resisting rod iron for rod mill, provide corresponding producer rule to be another object of the present invention.
Based on above-mentioned purpose, this invention takes following technical scheme: a kind of wear-resisting rod iron, described rod iron is pole, comprises 5 layers successively: the first layer is Decarburized layer, thickness 0.2 ~ 0.3mm from rod iron surface to its weave construction of heart portion; The second layer is organized as quenched martensite, thickness 0.8 ~ 1.0mm; Third layer is organized as tempered martensite+a small amount of bayesian, and thickness is 30% ~ 36% of rod iron radius; 4th layer tissue is the bainite of tempered martensite+increase gradually along heart portion (from outside to inside), and thickness is 30% ~ 36% of rod iron radius; All the other are layer 5, and it is organized as bainite+needle type martensite+minute quantity perlite.
Described rod iron is 42CrMo pole.
The 42CrMo pole that described rod iron is obtained by steel rolling obtains through quenching, self-tempering, is regulated the weave construction of rod iron inside by the heat treatment process of quenching, tempering is such.
The production method of described wear-resisting rod iron, comprises the following steps: (1) utilizes induction heater that 42CrMo pole is heated to 740 ± 10 DEG C and persistently overheating to quenching temperature at 3 ~ 7min, and described quenching temperature is 900 ~ 980 DEG C; (2) quench, in 2 ~ 6min, rod is cooled to 50 ~ 150 DEG C (rod iron surface temperatures); (3) self-tempering.Because rod iron size is usually comparatively large, after quenching, rod iron inside still has comparatively Gao Yuwen, and therefore, placed under field conditions (factors) by rod iron after quenching, more than rod iron inside, temperature is delivered to the upper layer of fire of having quenched, and spontaneously can complete drawing process.
Described quenching temperature is 930 ~ 960 DEG C.
In described step (2), in 2 ~ 6min, rod is cooled to 80 ~ 120 DEG C.
In described step (2), in 2 ~ 6min, rod is cooled to 80 ~ 100 DEG C.
Described step (2) adopts spray quench.
Wear-resisting rod iron provided by the invention, reduces to its hardness of heart portion gradually on surface.Such weave construction imparts the splendid wear-resisting property of rod iron, thus the work-ing life of rod iron is significantly enhanced: grinding initial stage, not easily there is viscous deformation because rod iron top layer has higher hardness (more than 55HRC), be therefore not easy to be destroyed; And in the middle and later periods of grinding, being pressed in inner soft matrix after the hard particle in rod iron surface comes off, rod iron still can maintain outstanding mill capacity.Meanwhile, inner base has good toughness, the 4th layer, layer 5 proportion in rod iron is proper, can guarantee rod iron not frangibility in process of lapping.
Meanwhile, production method process provided by the invention is simple, and production efficiency is high, especially quenching temperature is brought up to Ac
3900 ~ 980 DEG C more than (austenitic transformation finishing temperature 860 ~ 880 DEG C), and by Ac
1(austenite initial transition temperature, 740 ± 10 DEG C) at 3 ~ 7min, both ensure that rod iron can complete austenitic transformation to quenching temperature time controling used, and crystal grain does not also have enough time to grow up simultaneously, laid a good foundation for obtaining the rod iron product with higher hardness.In addition, in comparatively high temps quenching, after quenching, more heats have been put aside in rod iron inside, for the self-tempering of follow-up phase provides possibility, contribute to enhancing productivity, and reduce equipment investment.
Further restriction quenching temperature is 930 ~ 960 DEG C, is that product performance are more uniform and stable because the product hardness produced with this understanding, toughness are suitable.
Accompanying drawing explanation
Fig. 1 is the macrograph of rod iron second layer structure in embodiment 1;
Fig. 2 is the macrograph of rod iron third layer structure in embodiment 1;
Fig. 3 is the macrograph of rod iron layer 5 structure in embodiment 1.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
embodiment 1
A kind of wear-resisting rod iron is the 42CrMo pole of diameter 100mm, comprises 5 layers successively: the first layer is Decarburized layer, thickness 0.2mm from rod iron surface to its weave construction of heart portion; The second layer is organized as quenched martensite, thickness 0.8mm; Third layer is organized as tempered martensite+a small amount of bayesian, thickness 16mm; 4th layer tissue is the bainite of tempered martensite+increase gradually along heart portion, thickness 16mm; All the other are layer 5, and it is organized as bainite+needle type martensite+minute quantity perlite.
The 42CrMo pole that described wear-resisting rod iron is obtained by steel rolling obtains through quenching, self-tempering.
Its concrete production method comprises the following steps: (1) utilizes induction heater that the 42CrMo pole that steel rolling (hot rolling) obtains is heated to 740 ± 10 DEG C and persistently overheating to quenching temperature at 5min, and described quenching temperature is 900 ~ 910 DEG C; (2) spray quench, is cooled to 120 DEG C by rod in 3min; (3) self-tempering.
Detect obtained rod iron with reference to GB/T13298-1991 " the metal microstructure method of inspection ", GB/T224-2008 " the decarburized layer deepness assay method of steel ", detected result is as shown in table 1, and Fig. 1 ~ Fig. 3 is corresponding metallographic structure photo.
The survey report (national metal products Quality Supervision and Inspection Center) of table 1 embodiment 1 rod iron product
embodiment 2
A kind of wear-resisting rod iron is the 42CrMo pole of diameter 100mm, comprises 5 layers successively: the first layer is Decarburized layer, thickness 0.3mm from rod iron surface to its weave construction of heart portion; The second layer is organized as quenched martensite, thickness 1.0mm; Third layer is organized as tempered martensite+a small amount of bayesian, thickness 17mm; 4th layer tissue is the bainite of tempered martensite+increase gradually along heart portion, thickness 17mm; All the other are layer 5, and it is organized as bainite+needle type martensite+minute quantity perlite.
The 42CrMo pole that described wear-resisting rod iron is obtained by steel rolling obtains through quenching, self-tempering.
Its concrete production method comprises the following steps: (1) utilizes induction heater that 42CrMo pole is heated to 740 ± 10 DEG C and persistently overheating to quenching temperature at 3min, and described quenching temperature is 950 ~ 960 DEG C; (2) spray quench, is cooled to 80 DEG C by rod in 5min; (3) self-tempering.
embodiment 3
A kind of wear-resisting rod iron is the 42CrMo pole of diameter 100mm, comprises 5 layers successively: the first layer is Decarburized layer, thickness 0.3mm from rod iron surface to its weave construction of heart portion; The second layer is organized as quenched martensite, thickness 0.9mm; Third layer is organized as tempered martensite+a small amount of bayesian, thickness 17mm; 4th layer tissue is the bainite of tempered martensite+increase gradually along heart portion, thickness 16mm; All the other are layer 5, and it is organized as bainite+needle type martensite+minute quantity perlite.
The 42CrMo pole that described wear-resisting rod iron is obtained by steel rolling obtains through quenching, self-tempering.
Its concrete production method comprises the following steps: (1) utilizes induction heater that 42CrMo pole is heated to 740 ± 10 DEG C and persistently overheating to quenching temperature at 4min, and described quenching temperature is 970 ~ 980 DEG C; (2) spray quench, is cooled to 100 DEG C by rod in 4min; (3) self-tempering.
embodiment 4
A kind of wear-resisting rod iron is the 42CrMo pole of diameter 100mm, comprises 5 layers successively: the first layer is Decarburized layer, thickness 0.3mm from rod iron surface to its weave construction of heart portion; The second layer is organized as quenched martensite, thickness 0.8mm; Third layer is organized as tempered martensite+a small amount of bayesian, thickness 15mm; 4th layer tissue is the bainite of tempered martensite+increase gradually along heart portion, thickness 15mm; All the other are layer 5, and it is organized as bainite+needle type martensite+minute quantity perlite.
The 42CrMo pole that described wear-resisting rod iron is obtained by steel rolling obtains through quenching, self-tempering.
Its concrete production method comprises the following steps: (1) utilizes induction heater that 42CrMo pole is heated to 740 ± 10 DEG C and persistently overheating to quenching temperature at 7min, and described quenching temperature is 940 ~ 950 DEG C; (2) spray quench, is cooled to 150 DEG C by rod in 2min; (3) self-tempering.
embodiment 5
A kind of wear-resisting rod iron is the 42CrMo pole of diameter 115mm, comprises 5 layers successively: the first layer is Decarburized layer, thickness 0.2mm from rod iron surface to its weave construction of heart portion; The second layer is organized as quenched martensite, thickness 1.0mm; Third layer is organized as tempered martensite+a small amount of bayesian, thickness 19mm; 4th layer tissue is the bainite of tempered martensite+increase gradually along heart portion, thickness 20mm; All the other are layer 5, and it is organized as bainite+needle type martensite+minute quantity perlite.
The 42CrMo pole that described wear-resisting rod iron is obtained by steel rolling obtains through quenching, self-tempering.
Its concrete production method comprises the following steps: (1) utilizes induction heater that 42CrMo pole is heated to 740 ± 10 DEG C and persistently overheating to quenching temperature at 6min, and described quenching temperature is 920 ~ 930 DEG C; (2) spray quench, is cooled to 50 DEG C by rod in 6min; (3) self-tempering.
embodiment 4application test
With aluminum ore (80% crosses 30mm sieve) for grinding object, selected four rod mills are tested, wherein First Comparison study rod iron (certain steel mill's steel rolling rod iron, material 65Mn spring steel, hardness 17-23HRC), the 2nd, 3,4 uses the rod iron of embodiment 1,2,3 respectively.
Rod mill parameter: φ 3.2 × 4.5m wet rod mill, running speed 14.1 turns/min, rod iron diameter 100mm.
Operate after 3 months, the statistics rod iron replacement cycle.Statistics is in table 2.
The table 2 rod iron replacement cycle is added up
| Parameter | Contrast rod iron | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| The rod iron replacement cycle | 6 ~ 8 days | 15 ~ 18 days | 17～20 | 18～20 |
As can be seen from Table 2; the rod iron life-span provided by the invention is about 3 times that contrast rod iron; change after excellent number of times significantly reduces and decrease stop time, reduce the labour intensity of workman, contribute to enterprise and reduce use cost, improve ore pulp quality, extension device life-span.
Claims (8)
1. a wear-resisting rod iron, is characterized in that, described rod iron is pole, comprises 5 layers successively: the first layer is Decarburized layer, thickness 0.2 ~ 0.3mm from rod iron surface to its weave construction of heart portion; The second layer is organized as quenched martensite, thickness 0.8 ~ 1.0mm; Third layer is organized as tempered martensite+a small amount of bayesian, and thickness is 30% ~ 36% of rod iron radius; 4th layer tissue is the bainite of tempered martensite+increase gradually along heart portion, and thickness is 30% ~ 36% of rod iron radius; All the other are layer 5, and it is organized as bainite+needle type martensite+minute quantity perlite.
2. wear-resisting rod iron as claimed in claim 1, is characterized in that, described rod iron is 42CrMo pole.
3. wear-resisting rod iron as claimed in claim 2, is characterized in that, the 42CrMo pole that described rod iron is obtained by steel rolling obtains through quenching, self-tempering.
4. the production method of wear-resisting rod iron as claimed in claim 1, it is characterized in that, comprise the following steps: (1) utilizes induction heater that 42CrMo pole is heated to 740 ± 10 DEG C and persistently overheating to quenching temperature at 3 ~ 7min, and described quenching temperature is 900 ~ 980 DEG C; (2) quench, in 2 ~ 6min, rod is cooled to 50 ~ 150 DEG C; (3) self-tempering.
5. the production method of wear-resisting rod iron as claimed in claim 4, it is characterized in that, described quenching temperature is 930 ~ 960 DEG C.
6. the production method of wear-resisting rod iron as described in claim 4 or 5, is characterized in that, in described step (2), in 2 ~ 6min, rod is cooled to 80 ~ 120 DEG C.
7. the production method of wear-resisting rod iron as claimed in claim 6, is characterized in that, in described step (2), in 2 ~ 6min, rod is cooled to 80 ~ 100 DEG C.
8. the production method of wear-resisting rod iron as described in claim 4 or 5 or 7, is characterized in that, described step (2) adopts spray quench.
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| CN201510506550.5A CN105018704B (en) | 2015-05-04 | 2015-08-18 | A kind of wear-resisting rod iron and its production method |
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| CN2015102201781 | 2015-05-04 | ||
| CN201510506550.5A CN105018704B (en) | 2015-05-04 | 2015-08-18 | A kind of wear-resisting rod iron and its production method |
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| CN105018704B CN105018704B (en) | 2017-07-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455284A (en) * | 2020-05-26 | 2020-07-28 | 宜阳县鼎钰耐材有限公司 | Wear-resistant alloy steel bar and heat treatment process thereof |
| CN112760563A (en) * | 2020-12-22 | 2021-05-07 | 济南厚德耐磨材料有限公司 | Method for processing wear-resistant steel bar for quartz sand rod mill |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2302340A1 (en) * | 1975-02-28 | 1976-09-24 | Centre Rech Metallurgique | Brief surface quenching hot rolled steel prod. - leaving a rolling mill, to obtain surface zone of tempered martensite or bainite |
| JPS5573849A (en) * | 1978-11-22 | 1980-06-03 | Kawasaki Steel Corp | Refined high strength steel of low surface hardness |
| JPS6286125A (en) * | 1985-08-30 | 1987-04-20 | Kobe Steel Ltd | Production of hot rolled steel products having high strength and high toughness |
| JPH05105940A (en) * | 1991-10-16 | 1993-04-27 | Ito Seitetsushiyo:Kk | Method for improving surface property of profile bar steel and cooling device used to same method |
| JPH108202A (en) * | 1996-06-19 | 1998-01-13 | Sumitomo Metal Ind Ltd | Railway axle and its production |
-
2015
- 2015-08-18 CN CN201510506550.5A patent/CN105018704B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2302340A1 (en) * | 1975-02-28 | 1976-09-24 | Centre Rech Metallurgique | Brief surface quenching hot rolled steel prod. - leaving a rolling mill, to obtain surface zone of tempered martensite or bainite |
| JPS5573849A (en) * | 1978-11-22 | 1980-06-03 | Kawasaki Steel Corp | Refined high strength steel of low surface hardness |
| JPS6286125A (en) * | 1985-08-30 | 1987-04-20 | Kobe Steel Ltd | Production of hot rolled steel products having high strength and high toughness |
| JPH05105940A (en) * | 1991-10-16 | 1993-04-27 | Ito Seitetsushiyo:Kk | Method for improving surface property of profile bar steel and cooling device used to same method |
| JPH108202A (en) * | 1996-06-19 | 1998-01-13 | Sumitomo Metal Ind Ltd | Railway axle and its production |
Non-Patent Citations (2)
| Title |
|---|
| 崔忠圻: "《金属学与热处理》", 31 August 2007, 机械工业出版社 * |
| 杨意萍: "《轧钢工》", 31 July 2010, 化学工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455284A (en) * | 2020-05-26 | 2020-07-28 | 宜阳县鼎钰耐材有限公司 | Wear-resistant alloy steel bar and heat treatment process thereof |
| CN112760563A (en) * | 2020-12-22 | 2021-05-07 | 济南厚德耐磨材料有限公司 | Method for processing wear-resistant steel bar for quartz sand rod mill |
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