CN102268601B - 50Cr3MoV steel for back-up roll and heat treatment method for steel - Google Patents
50Cr3MoV steel for back-up roll and heat treatment method for steel Download PDFInfo
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Abstract
The invention discloses 50Cr3MoV steel for a back-up roll. The steel comprises the following chemical compositions in percentage by weight: 0.45 to 0.56 percent of carbon, 0.35 to 0.70 percent of manganese, 0.35 to 0.65 percent of silicon, less than or equal to 0.025 percent of phosphorus, less than or equal to 0.025 percent of sulfur, 2.8 to 3.6 percent of chromium, less than or equal to 0.40 percent of nickel, 0.50 to 0.80 percent of molybdenum, 0.08 to 0.20 percent of vanadium, less than or equal to 0.25 percent of copper, and the balance of iron and other impurities. The heat treatment for the back-up roll to obtain the final properties is needed to be carried out twice, the primary heat treatment is to perform quenching and tempering on the whole back-up roll; and the secondary heat treatment is to perform surface hardening on the body of the back-up roll. Because medium and high carbon medium-alloy steel is adopted, the comprehensive mechanical properties of the whole back-up roll are improved, and the fracture resistance and impact resistance of the back-up roll are improved. The back-up roll made of the steel can be used for cold and hot rolling mills for medium and thick plates and sheets in the steel industry and also can be used for aluminum sheet and aluminum foil mills.
Description
Technical field
The present invention relates to important rolling load parts carry roller steel and the heat treating method of bearing on the medium-sized and large-scale metal strip-mill strip (comprising single stand mill and multi-frame continuous-rolling).
Background technology
In recent ten years China Steel industry and the development of non-ferrous metals processing industry high speed.Metal plates and strips is that iron and steel and non-ferrous metals industry offer many manufacturing important raw and processed materials.Because still there are gap in the quality of China's Strip and productivity and developed country, improving support roll steel and heat treating method is to improve the quality of production of Strip and improve one of effective way of rolling rate.
Fig. 1 is the support roll sketch.1 district is the rim surface zona for the working lining of support roll among Fig. 1.This district is supporting the working face of working roll 5 under high speed rotating, referring to Fig. 2.The rolling load of working roll 5 is delivered to the rim surface zona 1 of support roll 4, requires hardness height, hardened-depth and wear resisting property good to this district.2 districts of support roll are the intermediate zone of support roll, require this district to have good intensity and higher plasticity and toughness, can bear heavy duty and certain impact and cut lotus; 3 districts of support roll are the roll neck district, this district's bearing set and plumer block, and its performance requriements and 2 districts are basic identical.
Because support roll 1 district is different with the performance requriements in 2 districts, the thermal treatment process that this two district carries out is different with heat treating method, and the performance after the thermal treatment is also different.
Summary of the invention
The object of the present invention is to provide a kind of 50Cr3MoV steel for backup roller and heat treating method, the present invention is owing to adopt the medium high carbon Medium Alloy Steel, improved the comprehensive mechanical property of support roll integral body, thereby anti-fracture energy and the impact resistance of support roll are improved, also be improved for wear resistance and the antistrip performance of the rim surface zona (1 district) of support roll.
To achieve these goals, the present invention adopts following technical scheme:
A kind of 50Cr3MoV steel for backup roller, the chemical component weight per-cent of described steel is: carbon C 0.45～0.56, manganese Mn 0.35～0.70, silicon Si 0.35～0.65, phosphorus P≤0.025, sulphur S≤0.025, chromium Cr 2.80～3.60, nickel≤0.40, molybdenum Mo 0.50～0.80, vanadium V 0.08～0.20, copper≤0.25, all the other are iron Fe and other impurity.
A kind of heat treating method of 50Cr3MoV steel for backup roller, described support roll obtain the thermal treatment of final performance need carry out secondary; For the first time thermal treatment is to the tempering of support roll integral quenching, and quenching temperature is 850～920 ℃, and soaking time is looked the size of support roll roll diameter and determined, is 9～30 hours for the support roll soaking time of roll diameter Φ 500～Φ 1500mm; Then cooled off in machine oil 80～200 minutes, and went tempering after fuel-displaced again, tempering temperature is 500～650 ℃, and tempering insulation time is 40～120 hours; Hardness after the processing is Shore hardness HSD 35～50;
For the second time thermal treatment is to support roll body of roll case-hardening thermal treatment, and the support roll preheating temperature is 500～600 ℃, and soaking time is 10～20 hours, then is heated rapidly to 880～920 ℃ of insulations with 〉=90 ℃/hour and quenches after 2～4 hours; Hardening liquid is water or oil, and be 80～200 minutes total cooling time; Immediately tempering after fuel-displaced, tempering temperature are 300～560 ℃, and tempering insulation time is 50-150 hour.
The described thermal treatment second time is to support roll body of roll case-hardening thermal treatment, so that support roll body of roll rim surface zona obtains the hardness of requirement, is Shore hardness HSD50～75, and case depth is 40～60mm.
The present invention has improved the comprehensive mechanical property of support roll integral body, thereby anti-fracture energy and the impact resistance of support roll is improved owing to adopt medium carbon alloy steel, and wear resistance and the antistrip performance of rim surface zona also are improved.The support roll of 50Cr3MoV steel for backup roller of the present invention manufacturing can be used for the hot and cold plate of moderate thickness of Iron And Steel Industry and sheet mill, also can be used for aluminium sheet band and aluminium foil mill.Owing to the long service life of support roll, reduced the production cost of Strip, improved the quality of Strip.
Description of drawings
Fig. 1 is the support roll sketch;
Fig. 2 is the fundamental diagram that the support roll milling train is housed;
Fig. 3 is support roll whole heat treatment process curve;
Fig. 4 is support roll body of roll top layer heat treatment cycle curve;
Fig. 5 is support roll body of roll case-hardening processing vertical resistance-band rapid heating furnace;
Fig. 6 example 1,2 support roll sketches;
Fig. 7 example 1,2 support roll whole heat treatment process curves;
Fig. 8 example 1,2 support roll body of roll top layer heat treatment cycle curves;
Fig. 9 example 3 support roll whole heat treatment process curves;
Figure 10 example 3 support roll body of roll top layer heat treatment cycle curves;
Among the figure: 1 rim surface zona, 2 intermediate zones, 3 roll neck districts, 4 support rolls, 5 working rolls, 6 frames, 7 metal plate and belts, 8 bodies of heater, 9 resistive band heating elements.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of 50Cr3MoV steel for backup roller, the chemical component weight per-cent (%) of described steel is: carbon (C) 0.45～0.56, manganese (Mn) 0.35～0.70, silicon (Si) 0.35～0.65, phosphorus (P)≤0.025, sulphur (S)≤0.025, chromium (Cr) 2.80～3.60, nickel (Ni)≤0.40, molybdenum (Mo) 0.50～0.80, vanadium (V) 0.08～0.20, copper (Cu)≤0.25, all the other are iron (Fe) and other impurity.
Described support roll obtains the thermal treatment of final performance need carry out secondary.For the first time thermal treatment is to the tempering of support roll integral quenching, adopt conventional Q-tempering treatment process, the hardness after the processing is Shore hardness HSD 35～50, as shown in Figure 3, quenching temperature is 850～920 ℃, and soaking time is looked the size of support roll roll diameter and determined according to a conventional method; Support roll soaking time for roll diameter Φ 500～Φ 1500mm is 9～30 hours.Then cooled off in machine oil 80～200 minutes, and went tempering after fuel-displaced again, tempering temperature is 500～650 ℃, and tempering insulation time is 40～120 hours.
For the second time thermal treatment is to support roll body of roll case-hardening thermal treatment, this is main innovate point of the present invention, after case-hardening thermal treatment, can make body of roll rim surface zona obtain the hardness that requires, be generally Shore hardness HSD50～75, case depth is 40～60mm, and as shown in Figure 4, the support roll preheating temperature is 500～600 ℃, soaking time is 10～20 hours, and then rapid heating (〉=90 ℃/hour) is quenched after 2～4 hours to 880～920 ℃ of insulations; Hardening liquid is water or oil, and be 80～200 minutes total cooling time.Immediately tempering after fuel-displaced, tempering temperature are 300～560 ℃, and tempering insulation time is 50-150 hour.
For the second time support roll body of roll case-hardening is processed and is carried out in the heat treatment furnace of special use.Fig. 5 is that support roll body of roll case-hardening processing uses vertical resistance-band rapid heating furnace, support roll 4 to be placed in the body of heater 8, is processed by resistive band heating element 9 heating that are installed on inboard wall of burner hearth.Rate of heating can keep or above 90 ℃/hour; Can make effective heat penetration reach 60～100mm through suitable soaking time, can guarantee the depth of hardening that requires after the thermal treatment.
The thermal treatment first time of 50Cr3MoV steel for backup roller of the present invention guarantees support roll intermediate zone (2 district) and axle journal district (3 district) desired hardness and performance, is called complete heat treatment; For the second time thermal treatment guarantees the high rigidity that rim surface zona (1 district) obtains requiring, and claims body of roll case-hardening thermal treatment, referring to Fig. 1.
Produce Φ 1200(roll diameter mm) * 2350(roll body length mm) * 5140(total length mm) 2 of steel plate hot finishing mill support rolls.Fig. 6 is the support roll sketch, and the single-piece finished product weighs 26.5 tons, and roll neck requires hardness HS 35～45, and the body of roll requires HS 50～60.
In electric arc furnace, make steel, pour into 80 tons of steel ingots.The actual chemical ingredients (weight percent) of steel ingot is: C 0.51, and Mn 0.49, and Si 0.56, and S 0.007, and P 0.019, and Cr 3.05, and Ni 0.14, and Cu 0.11, and Mo 0.74, and V 0.08.
80 tons of steel ingots are at 12000 tons of hydraulic press free forgings, and opening and forging temperature is 1240 ℃, and final forging temperature is 850 ℃.Upset ratio is 1.6, and pulling is than being 3.1, and blank is forged postheat treatment in the pallet car type gas-fired furnace.
Carry out roughing and nondestructive inspection (NDI) after forging stock production is finished, change for the first time support roll complete heat treatment after qualified over to.Can obtain good comprehensive mechanical property after the support roll complete heat treatment.Heat treatment cycle curve as shown in Figure 7, quenching temperature is 890 ℃, soaking time 20 hours; Then tempering is gone in cooling 200 minutes in machine oil after fuel-displaced again, and tempering temperature is 650 ℃, and tempering insulation time is 80 hours; By the mechanical property after this art breading be: Shore hardness HS 38, tensile strength sigma b 771 MPa, yield strength σ s 573MPa, unit elongation δ 5 (%) 21.7, reduction of area ψ (%) 54.0, impelling strength aku 57.5J/cm
2
Carry out semi-finishing after complete heat treatment is complete, change afterwards for the second time body of roll case-hardening thermal treatment over to.Can make the support roll body of roll (Φ 1200 * 2350 parts among Fig. 6) about 50～100mm of surperficial one deck depths obtain high rigidity through this processing.This support roll hardness of roll body requires Shore hardness HSD50～60.Press the heating quenching tempering in vertical resistance-band rapid heating furnace of Fig. 8 process curve, support roll body of roll preheating temperature is 600 ℃, and soaking time is 15 hours, then is heated rapidly to 900 ℃ of insulations with 〉=90 ℃/hour and quenches after 3 hours; Hardening liquid is oil, and be 180 minutes total cooling time; Immediately tempering after fuel-displaced, tempering temperature are 560 ℃, and tempering insulation time is 120 hours, and the hardness actual measurement that obtains requiring is salable product for HSD56～58.
Be all mutually 2 Φ 1200(roll diameter mm with embodiment 1 product) * 2350(roll body length mm) * 5140(total length mm) 2 of steel plate hot finishing mill support rolls, referring to Fig. 6.Smelting molten steel is identical with embodiment 1, and steel ingot is 80 tons.
The actual chemical ingredients (weight percent) of steel ingot is: C 0.46, and Mn 0.56, and Si 0.58, and S 0.008, and P 0.020, and Cr 3.35, and Ni 0.14, and Cu 0.16, and Mo 0.71, and V 0.09.
The forging and pressing of 80 tons of steel ingots are identical with embodiment 1, and the forging postheat treatment of forging is identical with embodiment 1.For the first time support roll whole heat treatment process curve as shown in Figure 7, quenching temperature is 890 ℃, soaking time 20 hours; Then tempering is gone in cooling 200 minutes in machine oil after fuel-displaced again, and tempering temperature is 650 ℃, and tempering insulation time is 80 hours.Mechanical property after the thermal treatment is: Shore hardness HS 37, tensile strength sigma b 789 MPa, yield strength σ s 584MPa, unit elongation δ 5 (%) 20.4, reduction of area ψ (%) 53.8, impelling strength aku 53.8J/cm
2
The heating quenching tempering in vertical resistance-band rapid heating furnace of Fig. 8 process curve is pressed in for the second time support roll body of roll case-hardening thermal treatment, support roll body of roll preheating temperature is 600 ℃, soaking time is 15 hours, then is heated rapidly to 900 ℃ of insulations with 〉=90 ℃/hour and quenches after 3 hours; Hardening liquid is oil, and be 180 minutes total cooling time; Immediately tempering after fuel-displaced, tempering temperature are 560 ℃, and tempering insulation time is 120 hours.Top layer measured hardness after the processing is HSD 55～57, is salable product.
2 Φ 960(roll diameter mm) * 1600(roll body length mm) * 3400(total length mm) aluminium sheet used for cold rolling mill support roll.Finished product weighs 12.15 tons, and roll neck requires hardness HS45～55, and the body of roll requires hardness HS75～80, case depth 〉=35mm, uniformity of hardness≤3HS.
In electric arc furnace, smelt and carry out the ladle vacuum refinement.The actual chemical ingredients (weight percent) of steel is: C 0.55, and Mn 0.56, and Si 0.50, and S 0.003, and P 0.012, and Cr 2.84, and Ni 0.29, and Cu 0.14, and Mo 0.57, and V 0.16.
Steel ingot is opened and forged temperature is 1250 ℃, 800 ℃ of final forging temperatures, forging ratio 〉=3.5.The forging postheat treatment is normalizing+tempering.Then carry out roughing and final thermal treatment.
For the first time support roll whole heat treatment process curve such as Fig. 9 technique.Quenching temperature is 890 ℃, and then soaking time 18 hours was cooled off 160 minutes in machine oil, and tempering temperature is 560 ℃, and 60 hours stoves are chilled to 150 ° and come out of the stove.Measured hardness is HS46～48.
Figure 10 technique is pressed in for the second time support roll body of roll case-hardening thermal treatment.In vertical resistance-band rapid heating furnace, heat.Body of roll preheating temperature is 550 ℃, soaking time 10 hours, and then the rapid heating heat-up rate is 95 °/h, rises to 900 ℃ of insulations 2.5 hours.Hardening liquid is water and oil, in water cold 12 minutes, oil cooling 120 minutes, fuel-displaced after immediately tempering.Tempering temperature is 320 ℃, and soaking time 100 hours is chilled to 150 ℃ and comes out of the stove in stove.The actual measurement surface hardness was HS 74～76 after processing finished, and uniformity of hardness 3HS is salable product.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention, therefore, all any modifications of doing within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. 50Cr3MoV steel for backup roller, it is characterized in that: the chemical component weight per-cent of described steel is: carbon 0.45～0.56, manganese 0.35～0.70, silicon 0.35～0.65, phosphorus≤0.025, sulphur≤0.025, chromium 2.80～3.60, nickel≤0.40, molybdenum 0.50～0.80, vanadium 0.08～0.20, copper 0.11～0.25, all the other are iron and other impurity.
2. implement the heat treating method of 50Cr3MoV steel for backup roller claimed in claim 1, it is characterized in that: described support roll obtains the thermal treatment of final performance need carry out secondary; For the first time thermal treatment is to the tempering of support roll integral quenching, and quenching temperature is 850～920 ℃, and soaking time is looked the size of support roll roll diameter and determined, is 9～30 hours for the support roll soaking time of roll diameter Φ 500～Φ 1500mm; Then cooled off in machine oil 80～200 minutes, and went tempering after fuel-displaced again, tempering temperature is 500～650 ℃, and tempering insulation time is 40～120 hours;
For the second time thermal treatment is to support roll body of roll case-hardening thermal treatment, and support roll body of roll preheating temperature is 500～600 ℃, and soaking time is 10～20 hours, then is heated rapidly to 880～920 ℃ of insulations with 〉=90 ℃/hour and quenches after 2～4 hours; Hardening liquid is water or oil, and be 80～200 minutes total cooling time; Immediately tempering after fuel-displaced, tempering temperature are 300～560 ℃, and tempering insulation time is 50-150 hour;
The described thermal treatment second time is to support roll body of roll case-hardening thermal treatment, so that support roll body of roll rim surface zona obtains the hardness of requirement, is Shore hardness HSD50～75, and case depth is 40～60mm.
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| CN102618788B (en) * | 2012-03-29 | 2013-11-20 | 宝山钢铁股份有限公司 | Support roll with high abrasion resistant performance and manufacturing method thereof |
| CN104152641A (en) * | 2014-08-17 | 2014-11-19 | 成都亨通兆业精密机械有限公司 | Carrier roller heat treatment technology |
| CN104152640A (en) * | 2014-08-17 | 2014-11-19 | 成都亨通兆业精密机械有限公司 | Carrier roller processing technique conducive to reducing heat treatment defects |
| CN105568135B (en) * | 2016-01-15 | 2017-07-28 | 中钢集团邢台机械轧辊有限公司 | A kind of forged steel rubber and plastic rolling mill roller and its heat treatment method |
| CN105886939A (en) * | 2016-06-14 | 2016-08-24 | 许炳初 | Steel for excavator slewing bearing and production process thereof |
| CN108277443B (en) * | 2018-01-29 | 2019-12-24 | 二重（德阳）重型装备有限公司 | Support roll of wide and thick plate mill with width of more than 4200mm and manufacturing process thereof |
| CN109161792A (en) * | 2018-08-29 | 2019-01-08 | 石钢京诚装备技术有限公司 | A kind of stud roller case material steel of high pressure roll press |
| CN109355561B (en) * | 2018-11-08 | 2021-03-12 | 宝钢轧辊科技有限责任公司 | Aluminum foil mill working roll and manufacturing method thereof |
| CN110791707B (en) * | 2019-10-31 | 2021-05-07 | 宝钢轧辊科技有限责任公司 | High-hardness hot rough rolling working roll for rolling nonferrous metal and manufacturing method thereof |
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| CN101481776A (en) * | 2009-02-13 | 2009-07-15 | 宝钢集团常州轧辊制造公司 | Cold rolling working roll with anti-rollar mark and high-wearing resistance and manufacturing method thereof |
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