CN101186995A - Medium carbon bearing steel and its preparation method - Google Patents
Medium carbon bearing steel and its preparation method Download PDFInfo
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Abstract
The invention relates to medium carbon bearing steel and process for preparation, belonging to the technical field of bearing steel material and process technology. According to weight percentage, the range of the chemical components of the medium carbon bearing steel includes that C holds 0.50% to 1.0%, Si is 0.60% to 1.50%, Mn takes 0.50% to 1. 20%, Mo is 0.15% to 1.0%, V takes 0.15% to 1.0%, Cr and Ni are equal to or less than 0.30%, Cu is equal to or less than 0.15%, S is equal to or less than 0.025%, P is equal to or less than 0.025%, B takes 0.0005% to 0.0035%, (O) is equal to or less than 15*10-6%, (H) is equal to or less than 2*10-6%, the rest is Fe and unavoidable foreign matters. The invention also provides the process for preparing beating steel, and round steel with the size of phi 70 to 150 millimeters can be produced by the process for preparation. The bearing steel can substitute for carburizing bearing steel, such as G20CrNi2Mo and the like, to be applied, and can substitute for import bearings in the field of rolling mills and the like. The invention can reduce the manufacture cost of the bearing and the utilization cost.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of bearing steel and manufacture method thereof, relate in particular to the bearing steel and the manufacture method thereof of a kind of rolling mill bearing that is used to make shock-resistant heavy lift or metallurgical mine cone bit bearing, petroleum drilling turbodrill bearing, rail vehicle bearing.
Background technology
At present, milling train is towards high speed, heavy duty, high strength, high rigidity, high precision, tandem rollingization and automation direction development, and rolling mill bearing is the vital part of milling train, is directly connected to production efficiency, quality product and the production cost of milling train.Compare with general purpose bearing, rolling mill bearing has following characteristics: (1) working load is big, and in general, rolled piece is being snapped fashionable being rolled, and promptly load is set up suddenly, and shock load is the stand under load characteristics of bearing thus.The unit pressure that common rolling mill bearing is born, than the high 2-4 of general purpose bearing doubly, and pv value (quadrature of bearing unit pressure and linear velocity) is 3-20 times of plain bearing.(2) work under bad environment, during mill milling, roll all will be used water cooling, and has iron scale to splash, and bearing is easy to be polluted.
At present, manufacturing milling train, oil equipment, rail vehicle are mainly carburizing bearing steels such as G20Cr2Ni4A or G20CrNi2Mo with the steel of high-strong toughness rolling bearing.Carburizing bearing steel is compared with the GCr15 bearing steel, and except that having kept surperficial high rigidity, high-wearing feature, notched bar impact strength has improved 7 times; Bigger residual compressive stress in the nitrogencase hardening layer has improved the contact fatigue strength of bearing.But carburizing bearing steel price height, and produce to go up and need use high large-scale periodic cementing furnace or the controlled atmosphere continuous carbonization Quenching Production Line of cost, carburizing time is long (generally to need 30～40h), comparatively strictness of quality layer control.Therefore, adopt carburizing bearing steel manufacturing cost height, long, complicated operation of thermal cycle, quality stability is poor.
CN1145643 discloses a kind of carburizing bearing steel with good rolling contact fatigue characteristic, the composition of this long-lived carburized bearing steel is by weight percentage: 0.1 to 0.35% C, 0.3 Mn to 2.0%, 0.001 S to 0.03%, 0.4 Cr to 0.5%, 0.01 Al to 0.07%, 0.003 N to 0.015%, 0.0005 Mg to 0.03% total content, " 0.35 to 0.70% Si " or " 0.05 to 1.70% Si and 0.30 to 1.20% Mo ", the Ni of certain content or V (containing wherein a kind of at least), and the P that is no more than 0.025%, be no more than 0.0050% Ti and total content and be no more than 0.002 O, the shared quantity ratio of contained Mg type oxide is at least 0.8 in the steel.
CN86107281 discloses a kind of Dutside furnace refining method to produce high purity bearing steel, it is characterized in that, under the state of ladle stamp, to the molten steel through furnace smelting just, molten slag is low basicity (or acid slag) before the casting, and rare gas element is gone in the bag bottom blowing or nitrogen purge is handled.Molten slag basicity (CaO/SiO2)≤2.5, the quantity of slag 1.5～3%.
CN1129465 discloses a kind of bearing steel that is used for the fabulous bearing part of rolling contact fatigue characteristic.It comprises (by weight): 0.70～1.20% C, 0.15～1.70% Si, 0.15～1.20% Mn, 0.50～2.00% Cr, 0.05～1.50% Mo, 0.001～0.03% S, 0.010～0.05% Al, 0.003～0.015% N, total Mg of 0.0005～0.0300%, be not more than 0.025% P, be not more than 0.0040% Ti, be not more than total O of 0.0015%, a kind of or at least two kinds be selected from V, the Nb of specific quantity and the element of Ni, and the quantity ratio of the oxide compound of contained Mg is at least 0.8 in the steel.
CN1266911 discloses a kind of improved bearing steel that is suitable for making the heavy wall ring, contains (by weight percentage): 1.00～1.10 C; Mostly be most 0.15 Si; 1.35～0.65 Mn; 1.70～1.90 Cr; 1.00～1.15 Ni; 0.40～0.50 Mo; Mostly be most 0.30 Cu; 0.015～0.050 Al, rest part are Fe and normal residual element and impurity.
CN1287183 discloses and a kind ofly has been suitable for big load, heavily impacts bearing steel under the operating mode, and its chemical constitution is (weight percent): C:0.6～0.8; Cr:0.2～0.34; Mn:0.55～0.85; Si:1.0～1.3; Mo:0.4～0.6; V:0.2～0.4; S≤0.025; P≤0.025, remainder is Fe.Its thermal treatment process is that Vehicle Processing rear bearing part is adopted direct quenching technology, its steel part is carried out Spheroidizing Annealing earlier, in the hope of obtaining the globular pearlite tissue; Carry out direct quenching and temper then.Vehicle Processing rear bearing part is adopted high-frequency surface hardening technology, its steel part is carried out normalizing and tempering or modifier treatment earlier,, carry out high-frequency surface hardening and temper then in the hope of obtaining the sorbite tissue.
CN1888116 discloses a kind of high hardness and high wear resistance no-magnetism bearing steel.The chemical ingredients of this bearing steel is formed (weight %): C 0.65～0.80%, and Mn 17.0～19.0%, and Si 0.5～1.0%, Cr 3.5～4.5%, and V 1.5～2.5%, and W 0.4～1.0%, Mo 0.4～1.0%, N≤0.12%, and all the other are Fe and unavoidable impurities.The concrete technology for preparing above-mentioned no-magnetism bearing steel is as follows: (1) smelting technology, and (2) forging process, (3) thermal treatment process divided for two steps again: the A. annealing heat treatment process: stove is chilled to 500 ℃ of air coolings of coming out of the stove behind 850 ℃～900 ℃ insulation 3～6h; B. solid solution+aging thermal treating process: solution heat treatment technology: being heated to austenitizing temperature is 1160 ℃～1200 ℃ fully insulation back water-cooleds; Aging thermal treating process: be heated to 630 ℃～700 ℃ * 15～20 hours, air cooling is to room temperature then.
Above-mentioned patent relates separately to the technology aspect raising rolling contact fatigue performance, raising bearing steel purity and particular applicability energy, but relates to manufacturing of high-strong toughness bearing steel and the cost reduction problem thereof under heavy lift, the HI high impact operating mode of not being applicable to that solve.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, mainly solve the too high problem of high-strong toughness rolling bearing manufacturing cost under heavy lift, the HI high impact operating mode.A kind of middle carbon high-performance bearing steel and manufacture method thereof with high-hardenability, high-strong toughness, excellent combination property is provided.
The invention provides a kind of middle carbon high-performance bearing steel, percentage ratio is to it is characterized in that it forming by weight:
C:0.50～1.0%, Si:0.60～1.50%, Mn:0.50～1.20%, Mo:0.15～1.0%, V:0.15～1.0%, Cr, Ni≤0.30%, Cu≤0.15%, S≤0.025%, P≤0.025%, B:0.0005～0.0035%, [O]≤15 * 10
-6, [H]≤2 * 10
-6, surplus is Fe and unavoidable impurities.
Determining of steel grades: all kinds of different repeated stresses are being born in rolling bearing work, thereby bearing materials will have high hardness, intensity, wear resistance and contact fatigue life, also high toughness will be arranged for rolling mill bearing or metallurgical mine cone bit bearing, petroleum drilling turbodrill bearing, rail vehicle bearing etc. simultaneously.The bearing steel performance mainly depends on chemical ingredients, clarity and three aspects of homogeneity of structure of steel, wherein has the greatest impact with chemical ingredients, has enough hardening capacity, hardness value and wear resistance for guaranteeing steel, and the control carbon content is at C:0.50～1.0%; Mn can improve the performance and the clarity of steel mainly as deoxidant element, control Mn:0.50～1.20%; Be reinforced ferrite, improve intensity, elastic limit and hardening capacity, improve anti-temper softening performance, control Si:0.60～1.50%; The effect of Mo is to improve hardening capacity, anti-temper resistance, reduces quenching strain, improves fatigue strength, improves mechanical property, control Mo:0.15～1.0%; V improves one of effective elements of wear resistance, can crystal grain thinning, improve the density and the toughness of steel, control V:0.15～1.0%; Trace B element mainly is in order to satisfy big specification, the requirement of heavy wall bearing products hardening capacity, to enlarge the steel grade Application Areas; S, P are considered as harmful element in bearing steel, therefore, the present invention controls S≤0.025%, P≤0.025%; Cr, Ni, Cu are residual element, for reducing harm, control Cr, Ni≤0.30%, Cu≤0.15%; For improving the purity and the fatigue lifetime of steel, the present invention has also proposed the control requirement to oxygen and hydrogen: [O]≤15 * 10
-6, [H]≤2 * 10
-6
Further preferred, middle carbon high-performance bearing steel of the present invention, percentage ratio is to it is characterized in that it forming by weight
C:0.50～0.70%, Si:0.80～1.20%, Mn:0.50～1.00%, Mo:0.45～0.75%, V:0.15～0.35%, Cr, Ni≤0.30%, Cu≤0.15%, S≤0.025%, P≤0.025%, B:0.0015～0.0025%, [O]≤15 * 10
-6, [H]≤2 * 10
-6, surplus is Fe and unavoidable impurities.
The invention provides a kind of preparation method of middle carbon bearing steel, comprise smelting and alloying, cast, rolling, slow cooling, it is characterized in that, the chemical component weight degree of control steel is: C:0.50～1.0%, Si:0.60～1.50%, Mn:0.50～1.20%, Mo:0.15～1.0%, V:0.15～1.0%, Cr, Ni≤0.30%, Cu≤0.15%, S≤0.025%, P≤0.025%, B:0.0005～0.0035%, [O]≤15 * 10
-6, [H]≤2 * 10
-6, surplus is Fe and unavoidable impurities.By the smelting control that the deoxidation of ladle argon-blown, vacuum outgas processing reinforcement steel is degassed, final deoxygenation feeding aluminum steel, adding B iron after vacuum outgas is handled; Adopt die casting or continuous casting; Steel ingot or steel billet are 1130～1280 ℃ in the soaking temperature of process furnace, and heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures; The speed of cooling of rolling the back steel is 0.5～1 ℃/min.
Rolling favorable tissue and the plasticity condition of providing can be provided heating quality, carbide forming element fully spreads and reduces segregation, can improve homogeneity of steel structure, design steel ingot or steel billet are 1130～1280 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures; The speed of cooling of rolling the back steel is 0.5～1 ℃/min.
Further preferred, the preparation method of middle carbon bearing steel can consider that following processing condition operate:
(1) smelting and alloying, electrosmelting, tapping adopt external refining, vacuum outgas to handle.Be the content of " effectively boron " and the hardening capacity of steel in the assurance steel; handling the deoxidation of strengthening steel by ladle argon-blown, vacuum outgas degass and smelts control; final deoxygenation feeding aluminum steel; vacuum outgas is handled the back and is added B iron; guarantee especially effective boron content 0.0005～0.0035% of chemical ingredients, hydrogen richness is not more than 2 * 10 in the steel
-6, oxygen level is not more than 15 * 10
-6, weight percentage.
(2) die casting or continuous casting are adopted in cast, the control superheating temperature, die casting ladle molten steel superheating temperature is that 70～80 ℃ or continuous casting tundish are 20～30 ℃, the control pouring speed, die casting is that 390～250mm/min (3 tons of ingots) or continuous casting casting speed are 0.55～1.0m/min, guarantees steel ingot or slab quality.
(3) rolling, steel ingot or steel billet are 1130～1280 ℃ in the soaking temperature of process furnace, and heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures.
(4) slow cooling, the speed of cooling of rolling the back steel is 0.5～1 ℃/min.
Preferably, to specification Φ 120mm～260mm steel, adopt die casting cast steel ingot-heating-750 milling train to become a useful person-retarded cooling process, the die casting pouring speed is 320～280mm/min; Specification is not more than Φ 30mm～120mm steel, adopts continuous casting strand-heating-rolling becoming a useful person-retarded cooling process to produce steel, the continuous casting casting speed is 0.55～1.0m/min (optimizing according to the base type).But adopt the round steel of this manufacture method production specification Φ 30～260mm.
Compared with prior art, technical scheme of the present invention has a following advantage:
1, the shock-resistant heavy loaded bearing with widespread use at present compares with steel
(1) steel of the present invention is controlled the content of micro-B, has guaranteed the hardening capacity of steel, makes this steel be suitable for making therefrom the small dimension bearing to the heavy mill bearing.
(2) this steel ton steel cost is low approximately by 30% than carburizing bearing steel, and processing greatly reduces Production of bearing enterprise manufacturing cost, improved production efficiency after has high strength, high impact toughness, high-wear resistance after the tempering of generally quenching.
(3) this steel has high over-all properties, demonstrates excellent performance in following several respects: have high hardening capacity, can make big specification rolling mill bearing; Hardness after the quenching (HRC) has improved the wear resistance of material greater than lower bainite; Its impelling strength is applicable to the bearing manufacturing of heavy lift, HI high impact working condition apparently higher than the impelling strength of carburizing bearing steel; Its radial load and converted steel are suitable.Bearing parts overall performance excellence after the processing, the bearing that adopts that this steel makes meets or exceeds the carburizing bearing steel work-ing life.
2, the preparation method of middle carbon bearing steel of the present invention
The smelting of steel, the deoxidation of strengthening steel is degassed to wait and is smelted control, guarantees the content of " effective boron " in the steel; The molten steel cast, die casting or continuous casting, control superheating temperature, pouring speed or casting speed, continuous cast mold adopts the west, Henan to protect the smelting material 55SiMnVB of Group Co.,Ltd privacy protection slag, according to the coagulating property of steel, and water allocation model reasonable in design, improve continuous casting billet quality, guarantee ingot quality; Steel rolling, steel ingot or steel billet are 1130～1280 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures; But adopt the round steel of this manufacture method production specification Φ 30～260mm.
Description of drawings
Fig. 1 is steel hot rolling attitude metallographic structure 100 * photo of the present invention
Fig. 2 be Φ 200mm hot rolled circular steel from the surface to centre hardness regularity of distribution figure, wherein X is the distance apart from the round steel surface, the mm of unit; Y is a round steel hot rolling attitude hardness, the HB of unit
Embodiment
Steel of the present invention is to adopt UHP (surpassing the power electric furnace)+LF (external refining)+VD (vacuum outgas) technology to smelt, and to specification Φ 120mm～260mm steel, adopts die casting cast steel ingot-heating-750 milling train to become a useful person-retarded cooling process; Specification is not more than Φ 30mm～120mm steel, adopts continuous casting strand-heating-rolling becoming a useful person-retarded cooling process to produce steel.
Embodiment 1:
How specify the present invention with the production technique of Φ 200mm specification steel implements.
Concrete processing step is:
(1) smelting and alloying, electrosmelting, tapping adopt external refining, vacuum outgas to handle.Handle the deoxidation of strengthening steel by ladle argon-blown, vacuum outgas and degas and smelt control, final deoxygenation feeding aluminum steel, vacuum outgas is handled the back and is added B iron, guarantee chemical ingredients especially effective boron content meet the requirements, hydrogen richness is not more than 2 * 10 in the steel
-6, oxygen level is not more than 15 * 10
-6
(2) cast, die casting, the control superheating temperature, die casting ladle molten steel superheating temperature is 70～80 ℃, the control pouring speed is 390～250mm/min (3 tons of ingot), guarantees ingot quality.
(3) rolling, steel ingot is 1130～1280 ℃ in the soaking temperature of process furnace, and heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, and 850～1000 ℃ of finishing temperatures are rolled back steel slow cooling, and speed of cooling is 0.5～1 ℃/min.
Heating and High temperature diffusion time also claim soaking time.
Concrete parameter sees Table 1 and table 2.
Table 1 is an embodiment bearing steel chemical ingredients, and table 2 is ladle molten steel superheating temperature, pouring speed, steel ingot Heating temperature, time and texturing temperature.
Table 1 bearing steel embodiment chemical ingredients (weight, %)
| Specimen coding | C | Si | Mn | Mo | V | P | S | Cr | Ni | Cu | B | O | H | Fe |
| 1 | 0.67 | 1.21 | 0.83 | 0.65 | 0.31 | 0.011 | 0.002 | 0.06 | 0.06 | 0.05 | 0.0015 | 9 | 1.0 | Surplus |
| 2 | 0.69 | 1.19 | 0.87 | 0.67 | 0.33 | 0.012 | 0.005 | 0.05 | 0.06 | 0.04 | 0.0020 | 10 | 1.0 | Surplus |
| 3 | 0.70 | 1.18 | 0.91 | 0.70 | 0.30 | 0.013 | 0.004 | 0.07 | 0.06 | 0.05 | 0.0022 | 9 | 1.0 | Surplus |
Table 2 ladle molten steel superheating temperature, pouring speed, steel ingot Heating temperature, time and texturing temperature
| Specimen coding | The ladle molten steel superheating temperature, ℃ | Pouring speed, mm/min | The steel ingot soaking temperature, ℃ | Soaking time, h | Start rolling temperature, ℃ | Finishing temperature, ℃ | The slow cooling temperature, ℃ |
| 1 | 75 | 320 | 1260 | 11 | 1150 | 950 | 600 |
| 2 | 77 | 300 | 1240 | 10.5 | 1120 | 980 | 580 |
| 3 | 72 | 310 | 1190 | 10.5 | 1140 | 960 | 595 |
Embodiment 2
How specify the present invention with the production technique of Φ 100mm specification steel implements.
Concrete processing step is:
(1) smelting and alloying, electrosmelting, tapping adopt external refining, vacuum outgas to handle.Handle the smelting control that the deoxidation of strengthening steel is degassed by ladle argon-blown, vacuum outgas, final deoxygenation feeding aluminum steel, vacuum outgas is handled the back and is added B iron, guarantee chemical ingredients especially effective boron content meet the requirements, hydrogen richness is not more than 2 * 10 in the steel
-6, oxygen level is not more than 15 * 10
-6
(2) cast, continuous casting, control superheating temperature, continuous casting tundish superheating temperature are that 20～30 ℃, control continuous casting casting speed are 0.55～1.0m/min (optimizing according to the base type), guarantee slab quality.
(3) rolling, steel billet is 1130～1280 ℃ in the soaking temperature of process furnace, and heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, and 850～1000 ℃ of finishing temperatures are rolled back steel slow cooling, and speed of cooling is 0.5～1 ℃/min.Heating and High temperature diffusion time also claim soaking time.
Concrete parameter sees Table 3 and table 4.
Table 3 is embodiment bearing steel chemical ingredientss, and table 4 is continuous casting tundish superheating temperature, casting speed, billet heating temperature, time and texturing temperature.
Table 3 bearing steel embodiment chemical ingredients (weight, %)
| Specimen coding | C | Si | Mn | Mo | V | P | S | Cr | Ni | Cu | B | O | H | Fe |
| 4 | 0.68 | 1.20 | 0.80 | 0.62 | 0.31 | 0.013 | 0.002 | 0.06 | 0.06 | 0.05 | 0.0015 | 9 | 1.0 | Surplus |
| 5 | 0.67 | 1.17 | 0.86 | 0.65 | 0.33 | 0.012 | 0.005 | 0.05 | 0.06 | 0.04 | 0.0020 | 10 | 1.0 | Surplus |
| 6 | 0.69 | 1.19 | 0.93 | 0.67 | 0.30 | 0.010 | 0.004 | 0.07 | 0.06 | 0.05 | 0.0022 | 9 | 1.0 | Surplus |
Table 4 continuous casting tundish superheating temperature, casting speed, billet heating temperature, time and texturing temperature
| Specimen coding | Continuous casting tundish superheating temperature, ℃ | The continuous casting casting speed, mm/min | The steel billet soaking temperature, ℃ | Soaking time, h | Start rolling temperature, ℃ | Finishing temperature, ℃ | The slow cooling temperature, ℃ |
| 4 | 25 | 0.60 | 1220 | 6.5 | 1120 | 950 | 600 |
| 5 | 28 | 0.65 | 1210 | 6.5 | 1100 | 980 | 580 |
| 6 | 23 | 0.60 | 1190 | 7 | 1140 | 960 | 570 |
In table 5, testing method adopts international method to this kind bearing steel through the relevant performance data rows of measuring.
The physical property of table 5 steel
| Specimen coding | State | Hardness, HRC (quenching) | Impact value Ak (J/cm 2) |
| 1 | Quench, tempering | |
190 180 |
| 2 | Surface 61 62 heart portions 41 45 | 200 210 | |
| 3 | Surface 62 62 heart portions 43 42 | 210 220 | |
| 4 | Surface 61 62 heart portions 45 42 | 220 200 | |
| 5 | |
190 210 | |
| 6 | Surface 61 62 heart portions 43 42 | 220 210 | |
| 20Cr2Ni4A | Carburizing | Surface 59 63 heart portions 38 42 | 81 82 |
Claims (5)
1. carbon high-performance bearing steel in a kind, percentage ratio is to it is characterized in that it forming by weight:
C:0.50～1.0%, Si:0.60～1.50%, Mn:0.50～1.20%, Mo:0.15～1.0%, V:0.15～1.0%, Cr, Ni≤0.30%, Cu≤0.15%, S≤0.025%, P≤0.025%, B:0.0005～0.0035%, [O]≤15 * 10
-6, [H]≤2 * 10
-6, surplus is Fe and unavoidable impurities.
2. carbon high-performance bearing steel in as claimed in claim 1, percentage ratio is to it is characterized in that it forming by weight:
C:0.50～0.70%, Si:0.80～1.20%, Mn:0.50～1.00%, Mo:0.45～0.75%, V:0.15～0.35%, Cr, Ni≤0.30%, Cu≤0.15%, S≤0.025%, P≤0.025%, B:0.0015～0.0025%, [O]≤15 * 10
-6, [H]≤2 * 10
-6, surplus is Fe and unavoidable impurities.
3. the preparation method of carbon high-performance bearing steel comprises smelting and alloying, cast, rolling, slow cooling in as claimed in claim 1, it is characterized in that, the chemical component weight degree of control steel is: C:0.50～1.0%, Si:0.60～1.50%, Mn:0.50～1.20%, Mo:0.15～1.0%, V:0.15～1.0%, Cr, Ni≤0.30%, Cu≤0.15%, S≤0.025%, P≤0.025%, B:0.0005～0.0035%, [O]≤15 * 10
-6, [H]≤2 * 10
-6, surplus is Fe and unavoidable impurities; Handle the deoxidation of strengthening steel by ladle argon-blown, vacuum outgas and degas and smelt control, final deoxygenation feeding aluminum steel, vacuum outgas is handled the back and is added B iron; Adopt die casting or continuous casting, steel ingot or steel billet are 1130～1280 ℃ in the soaking temperature of process furnace, and heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures; Rolling back steel speed of cooling is 0.5～1 ℃/min.
4. the preparation method of carbon high-performance bearing steel in as claimed in claim 3, processing condition are as follows:
(1) smelting and alloying, electrosmelting, tapping adopt external refining, vacuum outgas to handle; Be the content of " effectively boron " and the hardening capacity of steel in the assurance steel; handling the deoxidation of strengthening steel by ladle argon-blown, vacuum outgas degass and smelts control; final deoxygenation feeding aluminum steel; vacuum outgas is handled the back and is added B iron; guarantee especially effective boron content 0.0005～0.0035% of chemical ingredients, hydrogen richness is not more than 2 * 10 in the steel
-6, oxygen level is not more than 15 * 10
-6, weight percentage;
(2) die casting or continuous casting are adopted in cast, the control superheating temperature, die casting ladle molten steel superheating temperature is that 70～80 ℃ or continuous casting tundish are 20～30 ℃, the control pouring speed, die casting is that 390～250mm/min (3 tons of ingots) or continuous casting casting speed are 0.55～1.0m/min, guarantees steel ingot or slab quality;
(3) rolling, steel ingot or steel billet are 1130～1280 ℃ in the soaking temperature of process furnace, and heating and High temperature diffusion time are 4～12h, 1100～1250 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures;
(4) slow cooling, the speed of cooling of rolling the back steel is 0.5～1 ℃/min.
5. as the preparation method of claim 3 or 4 described middle carbon high-performance bearing steel, it is characterized in that to specification Φ 120mm～260mm steel, adopt die casting cast steel ingot-heating-750 milling train to become a useful person-retarded cooling process, the die casting pouring speed is 320～280mm/min; To specification Φ 30mm～120mm steel, adopt continuous casting strand-heating-rolling becoming a useful person-retarded cooling process to produce steel, the continuous casting casting speed is 0.55～1.0m/min.
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| CN102251186A (en) * | 2011-06-21 | 2011-11-23 | 莱芜钢铁集团有限公司 | Steel for high-strength mining machine and manufacturing method thereof |
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2007
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