CN103316929B - Rolling and cooling technology method for reducing GCR15 bearing steel zonary carbide level - Google Patents
Rolling and cooling technology method for reducing GCR15 bearing steel zonary carbide level Download PDFInfo
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- CN103316929B CN103316929B CN201210075318.7A CN201210075318A CN103316929B CN 103316929 B CN103316929 B CN 103316929B CN 201210075318 A CN201210075318 A CN 201210075318A CN 103316929 B CN103316929 B CN 103316929B
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Abstract
The invention discloses a rolling and cooling technology method for reducing GCR15 bearing steel zonary carbide level, which comprises the following steps: carrying out high temperature diffusion annealing after the die casting and the continuous casting of molten steel, keeping the temperature at 1260 DEG C for 1 to 3 hours, cogging blank into a slab or a square billet through blooming after the diffusion annealing, rolling the steel slab on a plank or a rod and wire mill in a heating furnace at the temperature of 1150 to 1200 DEG C for 1 to 2 hours in a multi-pass manner to roll into a finished steel product, wherein the roll beginning temperature of the rolling is not lower than 1120 DEG C, and the roll finishing temperature is not lower than 1020 DEG C, cooling through water immediately after the rolling, wherein the cooling temperature is not lower than 1000 DEG C, cooling the water to 620 to 660 DEG C, wherein the cooling speed is not lower than 50 DEG C per second, ascending the temperature to 780 DEG C along with the furnace by a spheroidizing annealing system to preserve heat for 40 minutes, and then cooling to the temperature of 650 DEG C to draw and wind-cool at the speed of 20 DEG C per second. Through the adoption of the bearing steels manufactured by the technology method, the level of the zonary carbide can be eliminated or reduced, and the requirement of the Chinese national standard can be well satisfied.
Description
Technical field
The present invention relates to a kind of bearing steel rolling and cooling process method, particularly relate to banded other rolling of carbide grade of a kind of reduction GCr15 bearing steel, cooling and heating treatment process.
Background technology
Bearing steel uses extensively, because it possesses very high contact fatigue and anti-wear performance, makes bearing steel be applied in all trades and professions, and the large bearing to milling train, little of the bearing in micro motor, bearing steel is omnipresent.The contact fatigue of bearing steel and anti-wear performance depend mainly on the carbide in tissue.The present situation of carbide, size, distributing homogeneity greatly affect above-mentioned performance.The general bearing steel capital need use after spheroidizing, carbide at this moment substantially in spherical distribution of particles in ferrite matrix, but can be zonal distribution along rolling direction.Cold Roll mainly still exists due to the alloying component segregation of Aliquation carbide after high temperature diffusion annealing, and elongates extension distribution along rolling direction, and various types of carbide of separating out in rolling or cooling procedure, along rolling to distribution, are formed banded.As Cr
7c
3aliquation carbide, after high temperature diffusion annealing, disappears although Aliquation carbide dissolves, and the component segregation of its Cr caused, still near stoste eutectoid carbide position, because Cr diffusion velocity is slow, can not be evenly distributed in steel billet completely after diffusion annealing.In existing pair rolling or process for cooling process, the carbide of other type of Cr can be separated out at the enrichment region of Cr and be formed Cold Roll.Can not Cold Roll be eliminated under the rolling of existing bearing steel, cooling and heating treatment process conditions, liquation and net carbide can only be eliminated.Cold Roll remains a key index of puzzlement bearing steel quality.
Through retrieval, the patent both at home and abroad about Carbide Control of Bearing Steel mainly concentrates on continuous casting stage and heating period, and basic not do corresponding research and patent application in rolling and cooling stage.As Japanese JP3075312 patent mainly carries out the control of distribution of carbides from heating cycle; JP59137164 mainly adopts electromagnetic agitation to improve distribution of carbides from source in the continuous casting stage; Spheroidizing heat treatment stages can not eliminate Cold Roll.
Summary of the invention
The object of the present invention is to provide banded other rolling of carbide grade of a kind of reduction GCr15 bearing steel and cooling process method, adopt the bearing steel that this process manufactures, can eliminate or reduce Cold Roll rank, meet the requirement of CNS well.
To achieve these goals, the present invention is achieved in that
Banded other rolling of carbide grade of a kind of reduction GCr15 bearing steel and cooling process method, comprise the following steps:
(1) molten steel carries out high temperature diffusion annealing after die casting or continuous casting, temperature 1260 DEG C insulation 1-3 hour;
(2) blank after diffusion annealing becomes slab or square billet through breaking down cogging;
(3) steel billet the heating of 1150-1200 DEG C of heating furnace after 1-2 hour on sheet material or bar wire rod rolling mill multi-pass rolling become finished steel; Rolling start rolling temperature is not less than 1120 DEG C, and finishing temperature is not less than 1020 DEG C;
(4) water-cooled immediately after rolling, open cold temperature and be not less than 1000 DEG C, Water cooling is to 620-660 DEG C, and water-cooled speed is not less than 50 DEG C/s;
(5) spheroidizing system is for being warming up to 780 DEG C of insulations 40 minutes with stove, is then chilled to 650 DEG C of air coolings of coming out of the stove with 20 DEG C/h.
Below main technique control procedure of the present invention is described in detail the impact reducing GCr15 bearing steel Cold Roll.
Process for making is on the impact of bearing steel product:
Continuous casting or die casting: ensure that all even surface quality of strand internal component is good, the steel ingot of die casting need be rolled into steel billet.Continuous casting can adopt electromagnetic agitation to improve the distribution of segregation and Aliquation carbide.
High temperature diffusion annealing: static ingot or continuous casting steel billet need to carry out Aliquation carbide through high temperature diffusion annealing and dissolve diffusion, temperature retention time depends on steel ingot, steel billet size specification, the temperature of diffusion annealing is 1260 DEG C, and time general 1-3 hour, inadequate extends.At this moment Aliquation carbide can the overwhelming majority dissolve, but the segregation of Cr can not be eliminated completely, and the segregation of C is simultaneously improved largely.
Cogging: the steel ingot of diffusion annealing or continuous casting billet, through breaking down rolling-cogging, adopt conventional heating, rolling and cooling system cogging.The main purpose of cogging obtains the blank being applicable to sheet material or bar wire rod rolling mill use, can improve the distribution of carbide through post bake cogging simultaneously.
Heat and rolling: after steel billet heats 1-2 hour at the temperature of 1150 ~ 1200 DEG C, on sheet material or bar wire rod rolling mill, multi-pass rolling becomes finished steel.Rolling start rolling temperature is not less than 1120 DEG C, and finishing temperature is not less than 1020 DEG C.Heating makes the abundant austenitizing of tissue, and carbide is dissolved in matrix completely; Finishing temperature is not less than 1020 DEG C, can avoid the precipitation of the carbide at rolling sequence Cr.
Quick cooling: water-cooled immediately after rolling, open cold temperature and be not less than 1000 DEG C, Water cooling is to 620-660 DEG C, and water-cooled speed is not less than 50 DEG C/s.This object cooled fast is the precipitation of the carbide suppressing Cr, as Cr
23c
6, eliminate or reduce the rank of Cold Roll.Quick cooling after rolling can suppress the precipitation of the carbide of Cr, makes most Cr be in solid solution condition, and in austenite phase transformation process subsequently, carbide is mainly with Fe
3the form of C is separated out.Because steel billet is through high temperature diffusion annealing, the distribution of its C compares homogenising substantially, and segregation is less, so Fe
3the Carbide Precipitation of C form can not be gathered into belt-like form, and therefore Cold Roll obtains effective suppression.
Spheroidizing: spheroidizing system, for being warming up to 780 DEG C of insulations 40 minutes with stove, is then chilled to 650 DEG C of air coolings of coming out of the stove with 20 DEG C/h.The object of spheroidizing makes rolling and the sorbite after rapid cooling or the lamellar carbide in troostite class loading interrupt, to dissolve and nodularization, on final formation ferrite matrix, fine uniform Dispersed precipitate the spherical carbonization material point of hard, improves contact fatigue and anti-wear performance.In spheroidizing process, Cr also can carbide precipitate, but defines Fe due to most of C
3c class carbide, even eliminates so the Cold Roll rank caused due to the segregation of Cr can reduce.
Rolling of the present invention and process for cooling and contrast technological parameter are in table 1.
Table 1 rolling of the present invention and process for cooling compare with contrast technique (existing bearing steel technique) parameter
| Technology type | Finishing temperature (DEG C) | Open cold temperature (DEG C) | Final cooling temperature (DEG C) | Water cooling speed (DEG C/s) |
| Present invention process | 1020-1080 | 1000-1050 | 620-660 | 50-100 |
| Contrast technique | 900 | 880 | 650 | 2-20 |
The present invention by high-temperature final rolling and roll rear quick cooling, inhibit along roll to the precipitation of carbide of part Cr in banded segregation region, reduce the rank of Cold Roll or thoroughly can eliminate Cold Roll.Institute's bearing steel sheet material that obtains or Bar Wire Product Cold Roll rank comply with the national standard requirements, and meet the high requirement of bearing relevant industries to bearing steel.
Adopt the bearing steel that process of the present invention manufactures, its Cold Roll is eliminated substantially, meets the requirement of CNS and user well.
Accompanying drawing explanation
Fig. 1 is the typical gold phase constitution photo obtained after diameter 25mm bearing steel adopts rolling process for cooling of the present invention and spheroidizing, and wherein: Fig. 1 a is the photo rolling state, Fig. 1 b is the photo of spheroidizing state.
Fig. 2 is the typical gold phase constitution photo obtained after diameter 25mm bearing steel adopts contrast technique and spheroidizing, and wherein: Fig. 2 a is the photo rolling state, Fig. 2 b is the photo of spheroidizing state.
Detailed description of the invention
For a more detailed description to the present invention by embodiment below.These embodiments are only the descriptions to best mode for carrying out the invention, do not have any restriction to scope of the present invention.
The steel rolling technique of embodiment, process for cooling and annealing process and contrast technique (existing bearing steel rolling process for cooling) are in table 2.
The rolling of table 2 embodiment of the present invention, cooling, annealing process and contrast technique (existing bearing steel technique) parameter
The molten steel that GCr15 bearing steel has been smelted by embodiments of the invention carries out continuous casting or die casting after Fruit storage, and the steel ingot of the die casting after high temperature diffusion annealing or continuous casting steel billet need split rolling method to become steel billet.After the square billet of rolling heats at the temperature of 1150 ~ 1200 DEG C, on sheet material or bar wire rod rolling mill, multi-pass rolling becomes finished steel.Roll rear employing water-cooled cool fast and air cooling to room temperature.Final steel must use after spheroidizing.The concrete technology parameter of all embodiments and contrast technological parameter are in table 2.
As can be seen from the above Examples and Comparative Examples, adopt rolling of the present invention and process for cooling and after spheroidizing heat treatment, the distribution of carbides of finished steel is even, Cold Roll≤1 grade or substantially eliminate.Be the typical gold phase constitution photo obtained after diameter 25mm bearing steel adopts rolling process for cooling of the present invention and spheroidizing see Fig. 1, Fig. 1, wherein: Fig. 1 a is the photo rolling state, Fig. 1 b is the photo of spheroidizing state.And same materials through existing rolling and process for cooling and after spheroidizing heat treatment Cold Roll rank be greater than 1 grade.Be that diameter 25mm bearing steel adopts the typical gold phase constitution photo that obtains after contrast technique and spheroidizing see Fig. 2, Fig. 2, wherein: Fig. 2 a is the photo rolling state, Fig. 2 b is the photo of spheroidizing state.Cold Roll is graded according to GB/T 18254-2002.
Claims (4)
1. reduce banded other rolling of carbide grade of GCr15 bearing steel and a cooling process method, it is characterized in that: comprise the following steps:
(1) molten steel carries out high temperature diffusion annealing after die casting or continuous casting, temperature 1260 DEG C insulation 1-3 hour;
(2) blank after diffusion annealing becomes slab or square billet through breaking down cogging;
(3) slab or square billet 1150-1200 DEG C of heating furnace heating after 1-2 hour on sheet material or bar wire rod rolling mill multi-pass rolling become finished steel; Rolling start rolling temperature is not less than 1120 DEG C, and finishing temperature is not less than 1020 DEG C;
(4) water-cooled immediately after rolling, open cold temperature and be not less than 1000 DEG C, Water cooling is to 620-660 DEG C, and water-cooled speed is not less than 50 DEG C/s;
(5) spheroidizing system is for being warming up to 780 DEG C of insulations 40 minutes with stove, is then chilled to 650 DEG C of air coolings of coming out of the stove with 20 DEG C/h.
2. banded other rolling of carbide grade of reduction GCr15 bearing steel according to claim 1 and cooling process method, is characterized in that: described finishing temperature is at 1020-1080 DEG C.
3. banded other rolling of carbide grade of reduction GCr15 bearing steel according to claim 1 and cooling process method, is characterized in that: described in open cold temperature at 1000-1050 DEG C.
4. banded other rolling of carbide grade of reduction GCr15 bearing steel according to claim 1 and cooling process method, is characterized in that: described water-cooled speed is at 50-100 DEG C/s.
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| CN104328259B (en) * | 2014-10-13 | 2017-02-01 | 北京科技大学 | GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology |
| CN105648170B (en) * | 2014-11-14 | 2018-04-27 | 苏州苏信特钢有限公司 | The control method and bearing steel of bearing steel net carbide and Cold Roll |
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| CN114669724B (en) * | 2022-03-31 | 2024-01-23 | 中天钢铁集团有限公司 | Control method for producing large-size wind power bearing steel carbide by continuous casting and rolling process |
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