CN101574706A - Sub-half high-speed steel roller and heat treatment process thereof - Google Patents
Sub-half high-speed steel roller and heat treatment process thereof Download PDFInfo
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- CN101574706A CN101574706A CNA2009100435549A CN200910043554A CN101574706A CN 101574706 A CN101574706 A CN 101574706A CN A2009100435549 A CNA2009100435549 A CN A2009100435549A CN 200910043554 A CN200910043554 A CN 200910043554A CN 101574706 A CN101574706 A CN 101574706A
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Abstract
The invention discloses a sub-half high-speed steel roller and a heat treatment process thereof. The sub-half high-speed steel roller comprises the following compositions: firstly, chemical compositions: 0.5 to 1.2 mass percent of C, 0.20 to 0.85 mass percent of Si, 0.90 to 5.00 mass percent of Cr and 1.2 to 5.0 mass percent of Mn+Mo+Ni+V+Ti+Re; secondly, tissue: pearlite+sorbite+Mc and M2c+few ferrite, or martensite+retained austenite+Mc and M2c, or bainite; and thirdly, 55 to 75 percent of HSD. The sub-half high-speed steel roller and the heat treatment process thereof solve the problem of severe collapse of a composite roller during use, have reasonable mixture ratio of alloy element, greatly reduce the waste of the alloy element, and not only can meet the use requirement of a rolling mill but also can greatly reduce the manufacturing cost of the roller.
Description
Technical field
The present invention relates to a kind of sub-half high-speed steel roller, the invention still further relates to the heat treatment production technology of this sub-half high-speed steel roller.
Background technology
Roll is the important tool and the running stores of rolling mill, belong to the Large-Scale Equipment manufacturing, the generation key of its product mainly is that the composition and the strong hardness of alloy composition handled, field, forward position for international new and high technology material development, the new material technology industry that is the state key development, helps, produce market has a extensive future, and meets national industrial policies.
The roll manufacturing industry is the industry of a high technology content, high added value.Roll is that each subject technology such as a logging material, metallurgy, moulding (casting, forging, built-up welding etc.), processing and manufacturing, heat treatment, surface treatment, control automatically, check, detection and operation technique are in the product of one, and be that above-mentioned each subject advanced comprehensive embodies, being one of key technology that promotes the steel and iron industry development, also is one of sign of weighing an above-mentioned every advanced technology degree of country and manufacturing technology level.
For a long time, cast steel roll only is used in cogging and shaping roll, and actual production shows, when adopting steel ingot to be forged into roll, and ratio of forging reduction very big (about 2-4), and the recovery rate of steel is not high, needs key equipments such as large-tonnage hydraulic press simultaneously.The center of forged steel roll (especially large-scale roller) is difficult to forge saturating, therefore the intensity in the center of roll is still not high, prove according to interrelated data, cast steel roll is by the reasonable coupling of chemical composition, improve the content of alloying element and through after the suitable heat treatment, with regard to its intensity not second to forged steel roll.And adopt cast steel roll replace forged steel make backing roll be fully may with reasonably.It also is roll producer's pursuit.
The rolling high efficiency of modern milling train, the high-quality market demand of stocking has promoted the technological progress of rolling steel industry, the continuous development of rolling technique, promote roll producer constantly various new roll manufactured materials of research and development and roll manufacturing technology, in new roll material, high speed steel material, the successful Application of semi-high speed steel material on roll are made the extensive concern that revolution on the history has obtained the world as roll.
People are known, and the requirement to backing roll mainly is:
1. certain intensity is arranged, avoid roll breakage and body of roll crackle; 2. high rigidity; 3. high fatigue strength; 4. high anti-strip; 5. body surface has higher hardness; 6. high anti-surface abrasion performance.
Because as the roll of indispensable running stores, one ton of metallic article of every production (containing ferrous metal and non-ferrous metal) need consume the 3-8 kilogram according to different materials, promptly the roll consumption amount is 3/1000ths to eight of an output.According to the data that China Iron ﹠ Steel Association announces, the demand of the present breaker roll in domestic market reaches 2,000,000 tons, and wherein the roll of high added value needs 300,000 tons of imports every year at least, and market capacity is extremely huge.The special steel ratio is 14.2% in the output of steels in 2005, and the special steel medium alloy steel is 7.28% than only, but increasing degree far surpasses the growth of iron and steel output.It is reported that domestic roll output amplification reached 57% from 1999 to 2003.Supply falls short of demand in present domestic high-end roll market.
Recent two decades comes, because the fund input of domestic roll factory is few, production equipment upgrades untimely, production equipment is single, backward and backward in technique, reasons such as the rational approach of each producer's breaker roll is not deep enough, comprehensive in addition cause China's roll manufacturing technology progress very slow, and the gap of introducing China and external roll industry according to related data expanded to 20 years.
The new roller of high-speed steel and the semi-high speed steel material roll excellent performance that to be the eighties in last century succeeded in developing by Japan, phosphorus content 〉=1.2%, the increase of carbon and alloying element content, make the structure property and the heat treatment process of material that basic variation all take place, very high quenching degree and high temperature hardness are specifically arranged, its carbide is based on Mc and M6c type, hardness height and disperse distribute, hardness is HSD60-80, make it have high wearability and anti-rough surface, have higher red hardness and high high temperature hardness, have steady preferably heat setting as backing roll.
High-speed steel roll is compared with other material rolls, and the characteristics of himself are arranged:
1. high-speed steel roll contains alloying elements such as higher vanadium, chromium, molybdenum, tungsten, and the carbide in the tissue is based on Mc and M6c type, and carbide morphology is good, hardness is high, the distribution disperse, thereby wearability is good.
2. high-speed steel roll has good steady hot and red hardness, has higher hardness and good wearability under routine;
3. high-speed steel roll has good quenching degree and hardenability, falls hardly to the hardness of working lining inside from body surface, thereby guarantees that roll has equal good wearability from outside to inside.
The difference of high-speed steel and half high-speed steel roller mainly is to show on the alloying element content difference, and both carbons and other content that forms the carbide alloy element differ nearly 1 times.Half high-speed steel roller mainly is the new material of the replacement high-speed steel roll succeeded in developing in order to solve alloying elements such as tungsten, cobalt contradiction in short supply.It is applied to a series of milling train backing rolls such as hot-continuous-rolling strip steel milling train, jobbing sheet-rolling mill, shaped steel universal mill, edging mill, cold-rolling mill at present.
But the wretched insufficiency that the bimetallic of high-speed steel, half high-speed steel roller is compound, composite roll in use seriously collapse the piece phenomenon; Alloying element is higher, has caused the waste greatly of alloying element, and the manufacturing cost of roll is higher simultaneously.
Summary of the invention
First technical problem to be solved by this invention provides a kind of intensity height, rigidity height, fatigue strength height, anti-strip height, body surface higher hardness and the high sub-half high-speed steel roller of anti-surface abrasion performance.
Second technical problem to be solved by this invention provides a kind of the solution and seriously collapses the piece phenomenon in the composite roll use, the rational proportion of alloying element, reduce the waste of alloying element greatly, can satisfy the instructions for use of milling train, reduce the Technology for Heating Processing of sub-half high-speed steel roller of the manufacturing cost of roll again significantly.
In order to solve the problems of the technologies described above, sub-half high-speed steel roller provided by the invention, it consists of:
1. chemical analysis mass content: C:0.5～1.2%, Si:0.20～0.85%, Cr:0.90～5.00%, Mn+Mo+Ni+V+Ti+Re:1.2～5.0%
2. organize: pearlite+sorbite+M
c, the M2c+ a little ferrite; Or
Martensite+paralympic+M
c, M2c, or
Bei Shiti;
③HSD：55～75。
The Technology for Heating Processing of sub-half high-speed steel roller provided by the invention the steps include:
(1). after roll demoulding sand removal, put into stove heat treatment during temperature in the stove≤120 ℃;
(2). begin to heat up after advancing kiln, material and weight according to roll are selected programming rate: when being warming up to 360 ± 20 ℃ with≤20 ℃/h, the homogenising insulation of carrying out 12 hours is handled, and continues to be warming up to 680 ± 20 ℃ with≤25 ℃/h, and the homogenising insulation of carrying out 12 hours is handled; When being warming up to 1000 ± 20 ℃ with≤50 ℃/h again, carry out the DIFFUSION TREATMENT about 36 hours, hang down flatcar air cooling and dust out;
(3). when treating air cooling to 450-500 ℃, with the roll flange, again shove charge preheating insulation 5.5～6.5 hours, treat to begin when internal and external temperature is close to be warming up to 680 ± 20 ℃ with≤30 ℃/h, carry out 5.5～6.5 hours insulation uniform treatment, be warming up to 920 ± 20 ℃ with≤50 ℃/h, normalizing or the atomizing carried out 20 hours are handled, and mist is cold, air-cooled according to requiring to take, air cooling or combined treatment;
(4). when treating that roll is cooled to 400 ± 20 ℃, again shove charge, the insulation 5.5～6.5 hours, treat to begin when internal and external temperature is close to be warming up to 680 ± 20 ℃ with≤30 ℃/h, the stress relief annealing of carrying out 36～40 hours is handled the blow-on gantry crane holding pit or the cooling of coming out of the stove when cooling to 200 ℃ then with the furnace.
Adopt the sub-half high-speed steel roller and the production technology of technique scheme, the monoblock cast method of sub-half high-speed steel backing roll series of products, remedied the compound wretched insufficiency of bimetallic of high-speed steel, half high-speed steel roller, solved and seriously collapsed the piece phenomenon in the composite roll use; The rational proportion of alloying element greatly reduces the waste of alloying element.Can satisfy the instructions for use of milling train, reduce the manufacturing cost of roll again significantly; After having adopted special thermal treatment, to the raising integral cast steel backing roll body surface hardness and the hard formation degree of depth, and the residual stress state of improving polishing roll, make roll have higher fatigue strength and abrasion resistance properties.The performance of roll is optimized.To improving roll service life and properties of product, reduce steel product cost, minimizing is scrapped because of roll and is caused waste of material.
In sum, the present invention is that a kind of the solution seriously collapsed the piece phenomenon in the composite roll use, the rational proportion of alloying element, reduce the waste of alloying element greatly, can satisfy the instructions for use of milling train, reduce the sub-half high-speed steel roller and the Technology for Heating Processing thereof of the manufacturing cost of roll again significantly.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the products' realization process flow chart;
Fig. 2 is technological process of production figure;
The Technology for Heating Processing of Fig. 3 sub-half high-speed steel large-scale supporting roller.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of sub-half high-speed steel roller, it consists of:
1. chemical analysis mass content: C:0.5～1.2%, Si:0.20～0.85%, Cr:0.90～5.00%, Mn+Mo+Ni+V+Ti+Re:1.2～5.0%;
2. organize: pearlite+sorbite+M
c, the M2c+ a little ferrite; Or
Martensite+paralympic+M
c, M2c; Or
Bei Shiti;
③HSD：55～75。
In order to produce above-mentioned sub-half high-speed steel roller, production technology provided by the invention is: batching, smelting, refining (check), join sand, coating, moulding (check), mould drying, matched moulds (check), cast (special procedure), sand removal, finishing, check, heat treatment (special procedure), check, hacking hole, rough turn, secondary tack, centering, finish turning (critical process), boring [brills] hole, mill key, brush flat side, grinding machine, polishing, finished product, check, packing and warehouse-in.
1. according to the specification requirement of company's sub-half high-speed steel series of products production, user's needs and the experience that company produces roll for many years, update the proportioning of chemical analysis, tentatively determine the proportioning of sub-half high-speed steel backing roll series of products chemical analysis.Realization replaces forged steel to make backing roll with cast steel roll.
2. Technology for Heating Processing is constantly adjusted and improved to the scope of application needs of the different milling trains of the user of having very much, by quality testing and user's result on trial, determines Technology for Heating Processing.
Through trial-production, on probation and pilot run, detect and update, improve production technology repeatedly.Reliability of products and stability have obtained sufficient demonstration, and have progressively formulated the technological process of production and product technology standard, realize casting and forging manufacturing backing roll.Forming approved product at last introduces to the market.
Be research, trial-production object at first with the backing roll (φ 850*800) on the widestrip mill among 850 millimeters of the φ, develop sub-half high-speed steel backing roll series of products technical data, the technological process of production and product technology standard have been formulated, promote the use of the backing roll (φ 1260*1210, φ 1560*1500, φ 1750*1700) of 1250 millimeters of φ and 1580 millimeters of φ and 1780 millimeters hot-strip tandem mills of φ again, set up complete production line.
The key problem in technology point:
The chemical element that comprises in i, the sub-half high-speed steel backing roll has different influences to the matrix of working lining with serviceability, raising along with phosphorus content, the wearability of roll linearly is increased sharply, and the rational proportion of alloying element plays a multiplier effect the performance of breaker roll.
Ii, cast steel roll because internal stress is big, are organized thick under as cast condition, can not satisfy rolling needs, must improve tissue, eliminate stress through corresponding heat treatment, make roll obtain desired matrix, have high fatigue strength and abrasion resistance properties to guarantee roll.
Referring to Fig. 1, Fig. 2 and Fig. 3, the Technology for Heating Processing of sub-half high-speed steel roller provided by the invention is:
1. after roll demoulding sand removal, put into stove heat treatment during temperature in the stove≤120 ℃, during loading of kiln, be in strict accordance with the operational procedure shove charge.That roll should be adorned is flat, the pad steady, to prevent distortion and to roll;
2. begin to heat up after advancing kiln, material and weight according to roll are selected programming rate: when being warming up to 360 ± 20 ℃ with≤20 ℃/h, the homogenising insulation of carrying out 12 hours is handled, continuation is warming up to 680 ± 20 ℃ with≤25 ℃/h, and the homogenising insulation of carrying out 12 hours is handled, its purpose all be for heating temperature inside and outside making roll even, prevent that local heating is too fast, internal-external temperature difference is too big, and internal stress is increased, and causes body of roll explosion or crackle occurs; When being warming up to 1000 ± 20 ℃ with≤50 ℃/h again, carry out the DIFFUSION TREATMENT about 36 hours, hang down flatcar air cooling and dust out; (there is the branch of winter and summer the air cooling time)
3. when treating air cooling to 450-500 ℃, with the roll flange, require decision whether to take directly safeguard measure such as sleeve or ceramic fibre of roller according to the specification requirement of roll, the particularly hardness in roller footpath, again shove charge preheating insulation 5.5～6.5 hours, treat to begin when internal and external temperature is close to be warming up to 680 ± 20 ℃ with≤30 ℃/h, carry out 5.5～6.5 hours insulation uniform treatment, be warming up to 920 ± 20 ℃ with≤50 ℃/h, normalizing or the atomizing carried out 20 hours are handled, and mist is cold, air-cooled according to requiring to take, air cooling or combined treatment;
4. when treating that roll is cooled to 400 ± 20 ℃, again shove charge, the insulation 5.5～6.5 hours, treat to begin when internal and external temperature is close to be warming up to 680 ± 20 ℃ with≤30 ℃/h, the stress relief annealing of carrying out 36～40 hours is handled the blow-on gantry crane holding pit or the cooling of coming out of the stove when cooling to 200 ℃ then with the furnace.
Claims (2)
1, a kind of sub-half high-speed steel roller, it is characterized in that: it consists of:
1. chemical analysis mass content: C:0.5～1.2%, Si:0.20～0.85%, Cr:0.90～5.00%, Mn+Mo+Ni+V+Ti+Re:1.2～5.0%;
2. organize: pearlite+sorbite+M
c, the M2c+ a little ferrite; Or
Martensite+paralympic+M
c, M2c, or Bei Shiti;
③HSD：55～75。
2, the technology of the sub-half high-speed steel roller of heat treatment claim 1 is characterized in that: the steps include:
(1). after roll demoulding sand removal, put into stove heat treatment during temperature in the stove≤120 ℃;
(2). begin to heat up after advancing kiln, material and weight according to roll are selected programming rate: when being warming up to 360 ± 20 ℃ with≤20 ℃/h, the homogenising insulation of carrying out 12 hours is handled, and continues to be warming up to 680 ± 20 ℃ with≤25 ℃/h, and the homogenising insulation of carrying out 12 hours is handled; When being warming up to 1000 ± 20 ℃ with≤50 ℃/h again, carry out the DIFFUSION TREATMENT about 36 hours, hang down flatcar air cooling and dust out;
(3). when treating air cooling to 450-500 ℃, with the roll flange, again shove charge preheating insulation 5.5～6.5 hours, treat to begin when internal and external temperature is close to be warming up to 680 ± 20 ℃ with≤30 ℃/h, carry out 5.5～6.5 hours insulation uniform treatment, be warming up to 920 ± 20 ℃ with≤50 ℃/h, normalizing or the atomizing carried out 20 hours are handled, and mist is cold, air-cooled according to requiring to take, air cooling or combined treatment;
(4). when treating that roll is cooled to 400 ± 20 ℃, again shove charge, the insulation 5.5～6.5 hours, treat to begin when internal and external temperature is close to be warming up to 680 ± 20 ℃ with≤30 ℃/h, the stress relief annealing of carrying out 36～40 hours is handled the blow-on gantry crane holding pit or the cooling of coming out of the stove when cooling to 200 ℃ then with the furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100435549A CN101574706B (en) | 2009-05-31 | 2009-05-31 | Sub-half high-speed steel roller and heat treatment process thereof |
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| CN101574706B CN101574706B (en) | 2010-12-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943214A (en) * | 2012-11-16 | 2013-02-27 | 武汉钢铁(集团)公司 | Automotive cold-rolled diaphragm spring steel and production method thereof |
| CN104561503A (en) * | 2014-12-23 | 2015-04-29 | 宝钢轧辊科技有限责任公司 | Local annealing method for large-scale forged steel supporting roll |
| CN111041347A (en) * | 2019-11-20 | 2020-04-21 | 长沙金铎机械有限公司 | Continuous rolling roller and preparation method thereof |
-
2009
- 2009-05-31 CN CN2009100435549A patent/CN101574706B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943214A (en) * | 2012-11-16 | 2013-02-27 | 武汉钢铁(集团)公司 | Automotive cold-rolled diaphragm spring steel and production method thereof |
| CN102943214B (en) * | 2012-11-16 | 2014-10-08 | 武汉钢铁(集团)公司 | Automotive cold-rolled diaphragm spring steel and production method thereof |
| CN104561503A (en) * | 2014-12-23 | 2015-04-29 | 宝钢轧辊科技有限责任公司 | Local annealing method for large-scale forged steel supporting roll |
| CN111041347A (en) * | 2019-11-20 | 2020-04-21 | 长沙金铎机械有限公司 | Continuous rolling roller and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN101574706B (en) | 2010-12-01 |
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