CN105132657A - Method for decreasing decarburized layers on surfaces of high-carbon-chromium bearing steel wires - Google Patents
Method for decreasing decarburized layers on surfaces of high-carbon-chromium bearing steel wires Download PDFInfo
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- CN105132657A CN105132657A CN201510630747.XA CN201510630747A CN105132657A CN 105132657 A CN105132657 A CN 105132657A CN 201510630747 A CN201510630747 A CN 201510630747A CN 105132657 A CN105132657 A CN 105132657A
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Abstract
The invention relates to a method for decreasing decarburized layers on surfaces of high-carbon-chromium bearing steel wires. The specific process comprises the steps that steel is molten to obtain molten steel which is subjected to continuous casting to form bearing steel, the bearing steel is subjected to continuous casting to form a bloom, and the bloom is rolled into square hot rolling billet with the section being 160mm*160mm; the surface of the square hot rolling billet is ground, and the grinding amount is 0.5-2mm; the square hot rolling billet is heated in a heating furnace, micro positive pressure control is adopted in the furnace, the pressure in the furnace is 5-40 Pa, the weak oxidizing atmosphere is adopted in the furnace, and the air-fuel ratio is adjusted to enable the oxygen remaining volume in the furnace to be 0-2%; and the spinning temperature is controlled to be 800-850 DEG C, cooling is performed at the rate of 5-10 DEG C/s after spinning to reduce the temperature to 500-600 DEG C, and then slow cooling is performed to obtain hot-rolled wire rods. According to the bearing steel wires obtained through the method, the surfaces are free of fully decarburized layers, and the depth of half decarburized layers is smaller than 50 microns; meanwhile, good component uniformity and internal structure uniformity are achieved, and the product quality requirement of downstream customers can be met; besides, the surface grinding amount of the downstream customers can be reduced, the cost is lowered, and a certain competitive advantage is provided.
Description
Technical field
The invention belongs to technical field of bearing steel production, particularly a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer.
Background technology
GCr15 bearing steel wire rod mainly for the manufacture of the rolling body of rolling bearing, as steel ball, roller etc.If the Decarburized layer on bearing steel wire rod surface controls bad, can be genetic on final steel ball or roller, make the surface of the rolling body after thermal treatment produce soft spots, cause the beginning of fatigue failure of hardness inequality and bearing.Rolling body manufacturing enterprise, in order to eliminate soft spots, only has increase amount of grinding, has both wasted material and has turn increased production cost and production efficiency.Therefore control the surface-carburized layer of bearing steel wire rod by production technology optimization, thus the quality product ensureing client and the process redundancy that reduces client reduce costs and just seem very necessary and very meaningful.
Have at present some producers to control the report of Decarburized layer aspect both at home and abroad, but mainly for spring steel wire and steel rail steel, and the processing method controlling bearing steel wire rod surface-carburized layer by process optimization specially also rarely have report.
The patent No. is that CN2012100399915 discloses " a kind of control method of surface decarburization of spring steel wires ", include chemical composition and the production technique of this steel grade, mainly through optimizing heating cycle, cooling system etc., the 55SiCr spring steel wire surface of production can be made without Fully decarburized layer, partial decarburization layer thickness is no more than 30 microns, but it is mainly for spring steel 55SiCr.
The patent No. is that CN2013102483079 discloses " a kind of surface-carburized layer is less than 0.3mm rail and manufacture method thereof ", include chemical composition and the preparation technology thereof of steel grade, mainly by controlling furnace temp, time and air coefficient, Rail Surface Decarburized layer can be made to be less than 0.3mm, but it is mainly for steel rail steel.
Patent No. CN2009100771253 discloses " a kind of high temperature protective coating for carbon steel ", and the one-tenth comprising this coating is grouped into and proportioning, can prevent billet surface decarburization, but it needs to increase certain cost and equipment investment.
Patent No. CN03117411.6 discloses " a kind of heating means preventing high-carbon steel billet or steel ingot decarburization ", steel billet or surface of steel ingot decarburized layer deepness is made to control in more shallow scope by optimizing heating cycle, but it heats mainly through taking strong oxidizing property atmosphere, different from the principle of the invention.
Reduce rolling body amount of grinding for downstream client and ensure the actual demand of quality product (not occurring soft spots), equipment and technics route feature in conjunction with steel mill self is passed through to optimize steel blank regrinding technique, heating cycle and cooling control technology, make produced bearing steel wire rod surface without Fully decarburized layer, half decarburized layer deepness is not more than 50 microns, meets the demand of downstream client.
Summary of the invention
The object of this invention is to provide a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer, provide a kind of surface-carburized layer to control good wire rod for down-stream enterprise produces bearing roller.Make gren rod surface decarburization layer depth be not more than 50 microns by process optimization, the amount of grinding of downstream client can be reduced, reduce costs, enhance productivity; Reduce the risk that rolling body surface soft spots causes fatigue failure simultaneously.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer, and specific embodiment is as follows:
(1) smelting molten steel continuous casting becomes bearing steel continuous casting blooms, is rolled into the hot rolling square billet of 160mm*160mm section by described bloom;
(2) reconditioning is carried out to hot rolling square billet surface, reconditioning quality 0.5-2mm;
(3) heated in process furnace by hot rolling square billet, take pressure-fired to control in stove, furnace pressure 5-40Pa, furnace atmosphere adopts weak oxide atmosphere, makes remaining oxygen≤2% in stove by adjustment air-fuel ratio;
(4) laying temperature controls at 800 ~ 850 DEG C, and slow cooling after being cooled to 500 ~ 600 DEG C with 5 ~ 10 DEG C/s speed after weaving silk, obtains gren rod.
In step of the present invention (3), heating condition is: furnace temperature of heating furnace divides three sections to raise in staged, and preheating section furnace temperature is 700 ~ 900 DEG C, and heating zone furnace temperature is 1000 ~ 1050 DEG C, and soaking zone furnace temperature is 1050 ~ 1100 DEG C, time inside furnace 80 ~ 130min.
Before bearing steel continuous casting blooms rolling in step of the present invention (1), heated by High temperature diffusion, temperature is 1200 ~ 1250 DEG C.
The specification of the bearing steel continuous casting blooms section in step of the present invention (1) is 300 ~ 325mm × 280 ~ 300mm.
Gren rod diameter in step of the present invention (4) is φ 5.5 ~ 20mm.
Gren rod half practical decarburized depth≤50 μm in step of the present invention (4), surface is without Fully decarburized layer.
The technology of the present invention principle is as follows: original decarburization and the surface imperfection of being eliminated hot rolling square billet surface by reconditioning; Process furnace weak oxide atmosphere heats, avoid billet surface be oxidized and decarburization serious, adopt pressure-fired to control simultaneously, avoiding air to enter process furnace causes local furnace gas oxygen level too high, the heating cycle that heat-processed takes staged to heat up heats, avoid the long heating and thermal insulation time simultaneously, thus alleviate the decarburization of heat-processed generation.Wire rod after weaving silk is cooled fast to less than 600 DEG C, when avoiding wire rod to cool between high-temperature zone overstand and produce decarburization further.
The rolling body surface that the bearing steel wire rod that the present invention produces can make downstream client produce, without soft spots, ensures the stability of fatigue strength, can reduce downstream client's amount of grinding simultaneously, reduce costs.
The beneficial effect adopting technique scheme to produce is: the φ 5.5-20mm bearing steel wire rod that the present invention obtains, surface is without Fully decarburized layer, half decarburized layer deepness is less than 50 microns, there is good homogeneity of ingredients and the homogeneity of interior tissue simultaneously, the quality product requirement of downstream client can be met, the surface grinding amount of downstream client can be reduced simultaneously, reduce costs, there is certain competitive edge.
Accompanying drawing explanation
Fig. 1 is GCr15 bearing steel hot rolling square billet sharpening front surface Decarburized layer;
Fig. 2 is GCr15 bearing steel hot rolling square billet sharpening rear surface Decarburized layer;
Fig. 3 is GCr15 bearing steel wire rod (Φ 5.5mm) surface-carburized layer≤5 micron;
Fig. 4 is GCr15 bearing steel wire rod (Φ 12mm) surface-carburized layer 20 microns;
Fig. 5 is GCr15 bearing steel wire rod (Φ 20mm) surface-carburized layer 40 microns.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
Embodiment 1
Smelting molten steel continuous casting becomes 325mm*280mm section bloom, its composition is by weight percentage: C1.0%, Si0.24%, Mn0.36%, Cr1.49%, P0.012%, S0.004%, Cu0.03%, Ni0.02% all the other be iron and inevitable impurity element.
Bloom cogging after adding thermodiffusion becomes the hot rolling square billet of 160mm*160mm section, to hot rolling square billet figuring of surface 1mm.
Hot rolling square billet is heated in process furnace, preheating section temperature 800 DEG C, heating zone temperature 1040 DEG C, soaking zone temperature 1060 DEG C, remaining oxygen 0.5%, time inside furnace 100min.
Steel billet is weaved silk at 820 DEG C after high-speed rolling, and after weaving silk, speed of cooling controls slow cooling after 8 DEG C/s is cooled fast to less than 600 DEG C.
The GCr15 bearing steel gren rod of the Φ 5.5mm specification of producing by present invention process, surface-carburized layer≤5 micron, other are functional.
Embodiment 2
Smelting molten steel continuous casting becomes 325mm*280mm section bloom, its composition is by weight percentage: C0.99%, Si0.23%, Mn0.35%, Cr1.50%, P0.010%, S0.003%, Cu0.03%, Ni0.02% all the other be iron and inevitable impurity element.
Bloom cogging after adding thermodiffusion becomes the hot rolling square billet of 160mm*160mm section, to hot rolling square billet figuring of surface 1.5mm.
Hot rolling square billet is heated in process furnace, preheating section temperature 850 DEG C, heating zone temperature 1050 DEG C, soaking zone temperature 1070 DEG C, remaining oxygen 0.6%, time inside furnace 90min.
Steel billet is weaved silk at 840 DEG C after high-speed rolling, and after weaving silk, speed of cooling controls slow cooling after 7 DEG C/s is cooled fast to less than 600 DEG C.
The GCr15 bearing steel gren rod of the Φ 12mm specification of producing by present invention process, surface-carburized layer 20 microns, other are functional.
Embodiment 3
Smelting molten steel continuous casting becomes 325mm*280mm section bloom, its composition is by weight percentage: C1.1%, Si0.24%, Mn0.37%, Cr1.47%, P0.013%, S0.002%, Cu0.03%, Ni0.02% all the other be iron and inevitable impurity element.
Bloom cogging after adding thermodiffusion becomes the hot rolling square billet of 160mm*160mm section, to hot rolling square billet figuring of surface 2mm.
Hot rolling square billet is heated in process furnace, preheating section temperature 840 DEG C, heating zone temperature 1030 DEG C, soaking zone temperature 1060 DEG C, remaining oxygen 0.5%, time inside furnace 95min.
Steel billet is weaved silk at 850 DEG C after high-speed rolling, is cooled fast to less than 600 DEG C to carry out slow cooling after weaving silk with 6 DEG C/s speed of cooling.
The GCr15 bearing steel gren rod of the Φ 20mm specification of producing by present invention process, surface is without Fully decarburized layer, and half decarburized layer deepness 40 microns, other are functional.
The present invention is under the iron and steel situation of sternness, from client's actual demand, in line with meeting consumer product service requirements, setting out for the cost-effective angle of user simultaneously, passing through process optimization, produce the bearing steel hot rolling with excellent surface Decarburization Control effect to coil, meet client's Production requirement, both met the specification of quality of client, again for user reduces cost pressure, improve product competitiveness in the market simultaneously, reach the effect of doulbe-sides' victory.
Claims (6)
1. alleviate a method for high-carbon-chromium bearing steel wire surface Decarburized layer, it is characterized in that, specific embodiment is as follows:
(1) smelting molten steel continuous casting becomes bearing steel continuous casting blooms, is rolled into the hot rolling square billet of 160mm*160mm section by described bloom;
(2) reconditioning is carried out to hot rolling square billet surface, reconditioning quality 0.5-2mm;
(3) heated in process furnace by hot rolling square billet, take pressure-fired to control in stove, furnace pressure 5-40Pa, furnace atmosphere adopts weak oxide atmosphere, makes remaining oxygen≤2% in stove by adjustment air-fuel ratio;
(4) laying temperature controls at 800 ~ 850 DEG C, and slow cooling after being cooled to 500 ~ 600 DEG C with 5 ~ 10 DEG C/s speed after weaving silk, obtains gren rod.
2. a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer according to claim 1, it is characterized in that, in described step (3), heating condition is: furnace temperature of heating furnace divides three sections to raise in staged, preheating section furnace temperature is 700 ~ 900 DEG C, heating zone furnace temperature is 1000 ~ 1050 DEG C, soaking zone furnace temperature is 1050 ~ 1100 DEG C, time inside furnace 80 ~ 130min.
3. a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer according to claim 1 and 2, is characterized in that, before the bearing steel continuous casting blooms rolling in described step (1), heated by High temperature diffusion, temperature is 1200 ~ 1250 DEG C.
4. a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer according to claim 1 and 2, is characterized in that, the specification of the bearing steel continuous casting blooms section in described step (1) is 300 ~ 325mm × 280 ~ 300mm.
5. a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer according to claim 1, is characterized in that, the gren rod diameter in described step (4) is φ 5.5 ~ 20mm.
6. a kind of method alleviating high-carbon-chromium bearing steel wire surface Decarburized layer according to claim 1, is characterized in that, gren rod half practical decarburized depth≤50 μm in described step (4), and surface is without Fully decarburized layer.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105655583A (en) * | 2016-03-04 | 2016-06-08 | 贵州安达科技能源股份有限公司 | Treatment method of metal lithium phosphate material and metal lithium phosphate material prepared by same |
| CN106521120A (en) * | 2016-10-26 | 2017-03-22 | 南京钢铁股份有限公司 | Bearing steel heating decarbonization control method |
| CN106513439A (en) * | 2016-10-10 | 2017-03-22 | 武汉钢铁股份有限公司 | Manufacturing method for hot-rolled high-carbon steel sheet strip with single-face decarburized layer ratio smaller than 0.7% |
| CN108396128A (en) * | 2017-11-28 | 2018-08-14 | 江苏省沙钢钢铁研究院有限公司 | A kind of control method of bloom alloy tool steel wire surface decarburization |
| CN109022709A (en) * | 2018-09-28 | 2018-12-18 | 邢台钢铁有限责任公司 | A kind of heating process for eliminating steel billet thermal stress |
| CN109112280A (en) * | 2018-08-07 | 2019-01-01 | 南京钢铁股份有限公司 | A kind of control method of bearing steel wire rod decarburized depth |
| CN110153179A (en) * | 2019-06-10 | 2019-08-23 | 南京钢铁股份有限公司 | The process of the fiery bearing steel of cooling rolling two |
| CN110665970A (en) * | 2019-10-08 | 2020-01-10 | 武汉钢铁集团鄂城钢铁有限责任公司 | Production method of GCr15 hot rolled strip steel for spinning |
| CN111254363A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of cord wire rod steel |
| CN111926163A (en) * | 2020-07-03 | 2020-11-13 | 邢台钢铁有限责任公司 | Production method of bearing steel wire rod |
| CN111926159A (en) * | 2020-07-03 | 2020-11-13 | 邢台钢铁有限责任公司 | High-temperature diffusion heating method for reducing decarburization of bearing steel wire rod |
| CN112355054A (en) * | 2020-10-22 | 2021-02-12 | 联峰钢铁（张家港）有限公司 | Large-size high-carbon chromium bearing steel hot-rolled wire rod and high-speed wire rod production method thereof |
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Cited By (16)
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| CN105655583A (en) * | 2016-03-04 | 2016-06-08 | 贵州安达科技能源股份有限公司 | Treatment method of metal lithium phosphate material and metal lithium phosphate material prepared by same |
| CN106513439A (en) * | 2016-10-10 | 2017-03-22 | 武汉钢铁股份有限公司 | Manufacturing method for hot-rolled high-carbon steel sheet strip with single-face decarburized layer ratio smaller than 0.7% |
| CN106521120A (en) * | 2016-10-26 | 2017-03-22 | 南京钢铁股份有限公司 | Bearing steel heating decarbonization control method |
| CN106521120B (en) * | 2016-10-26 | 2018-05-01 | 南京钢铁股份有限公司 | A kind of bearing steel heats Decarburization Control method |
| CN108396128A (en) * | 2017-11-28 | 2018-08-14 | 江苏省沙钢钢铁研究院有限公司 | A kind of control method of bloom alloy tool steel wire surface decarburization |
| CN109112280A (en) * | 2018-08-07 | 2019-01-01 | 南京钢铁股份有限公司 | A kind of control method of bearing steel wire rod decarburized depth |
| CN109022709B (en) * | 2018-09-28 | 2020-03-06 | 邢台钢铁有限责任公司 | Heating process for eliminating thermal stress of steel billet |
| CN109022709A (en) * | 2018-09-28 | 2018-12-18 | 邢台钢铁有限责任公司 | A kind of heating process for eliminating steel billet thermal stress |
| CN110153179A (en) * | 2019-06-10 | 2019-08-23 | 南京钢铁股份有限公司 | The process of the fiery bearing steel of cooling rolling two |
| CN110665970A (en) * | 2019-10-08 | 2020-01-10 | 武汉钢铁集团鄂城钢铁有限责任公司 | Production method of GCr15 hot rolled strip steel for spinning |
| CN110665970B (en) * | 2019-10-08 | 2020-12-25 | 宝武集团鄂城钢铁有限公司 | Production method of GCr15 hot rolled strip steel for spinning |
| CN111254363A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of cord wire rod steel |
| CN111926163A (en) * | 2020-07-03 | 2020-11-13 | 邢台钢铁有限责任公司 | Production method of bearing steel wire rod |
| CN111926159A (en) * | 2020-07-03 | 2020-11-13 | 邢台钢铁有限责任公司 | High-temperature diffusion heating method for reducing decarburization of bearing steel wire rod |
| CN112355054A (en) * | 2020-10-22 | 2021-02-12 | 联峰钢铁（张家港）有限公司 | Large-size high-carbon chromium bearing steel hot-rolled wire rod and high-speed wire rod production method thereof |
| CN112355054B (en) * | 2020-10-22 | 2022-06-03 | 联峰钢铁（张家港）有限公司 | Large-size high-carbon chromium bearing steel hot-rolled wire rod and high-speed wire rod production method thereof |
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Application publication date: 20151209 |