CN103409688B - Large forged high-speed steel cold roll and manufacturing method thereof - Google Patents
Large forged high-speed steel cold roll and manufacturing method thereof Download PDFInfo
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- CN103409688B CN103409688B CN201310290009.6A CN201310290009A CN103409688B CN 103409688 B CN103409688 B CN 103409688B CN 201310290009 A CN201310290009 A CN 201310290009A CN 103409688 B CN103409688 B CN 103409688B
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Abstract
The invention discloses a large forged high-speed steel cold roll and a manufacturing method thereof. The cold roll comprises the following chemical constituents in percentage by mass: 0.90-1.20% of C, 0.20-1.20% of Si, 0.20-1.00% of Mn, 6.00-12.00% of Cr, 2.00-5.00% of Mo, 1.00-4.00% of V, 0.80-2.00% of W, not greater than 0.80% of Ni, not greater than 0.02% of P, not greater than 0.02% of S, and the balance of Fe and inevitable impurities. The manufacturing method for the cold roll comprises the process steps of steel ingot refining, billet forging, pre-heat treatment, machining, final heat treatment and the like. The surface layer hardness of a roll body of the cold roll manufactured by the manufacturing method disclosed by the invention is 88-98 HSD; the cold roll is excellent in wear resistance, high in roughness holding capacity and high in structure stability. According to the manufacturing process disclosed by the invention, chroming process steps are reduced and production cost is decreased.
Description
Technical field
The present invention relates to a kind of cold roll and manufacture method thereof, specifically a kind of forging high speed steel cold roller and manufacture method thereof.
Background technology
Roll, as the important tool of steel rolling industry, is the main consumable part of steel rolling equipment.Cold roll is that a kind of mode passing through to extrude in the cold state is by working part shaping for intermetallic composite coating.Cold roll will bear very large rolling stress in the course of the work, problems such as adding the weld seam of rolled piece, be mingled with, limit is split, its working conditions is severe, easily causes instantaneous high-temperature, make cold roll be subject to strong thermal shocking, easily cause crackle, roll banding, peel off and even scrap.Due to cold roll, suffered stress is very big in the course of the work, and cold roll surface is often peeling, fall the failure mode such as block, wearing and tearing, therefore requires that its surface possesses quite high hardness, wear resistance and splitting resistance.Cold roll not only will have the cracking resisted because stress in bending, torsional stress and shear-stress cause and the ability of peeling off in a word, also will have high wear resistance, contact fatigue strength, fracture toughness property and thermal shock strength etc. simultaneously.
The outer market of Present Domestic is used for manufacturing material mainly Cr2, Cr3 and Cr5 series of cold roll, and Cr2 series is used for greatly small-sized cold-rolling mill and the poor reversable cold-rolling machine of part equipment; Cr3 series cold roll is used for greatly reversable cold-rolling machine and part Large Scale Cold milling train; Current Cr5 series is the main flow material of Chinese forging steel cold roll, and most of cold-rolling mill and strip quality require that higher Reversible Single Stand Cold Rolling Mill substantially all adopts Cr5 series of tasks roller and intermediate roll.
Along with the high speed development of the industries such as automobile, household electrical appliances, electronics, the specification of quality of cold rolled sheet and siliconized plate is being improved constantly, also more and more higher to the specification of quality of cold roll.And the cold roll of above-mentioned chromium steel series is when rolled sheet metal or siliconized plate, often occur in the operation of rolling skidding between working roll and material to be rolled; Used in the near future at working roll, many work roll surface roughness sharply reduce, the surface quality of direct influence of rolled sheet material and conforming product rate.These situations are all because the wearing no resistance of working roll, surfaceness hold facility difference cause.Conventional high-carbon chromium steel cold roll is due to the restriction by material self, while possessing compared with high-wearing feature, be difficult to have good anti-accident ability, therefore, under cold rolled silicon steel etc. requires higher environment for use to cold roll over-all properties, the limitation of conventional high-carbon chromium steel cold roll material also just highlights.At present these problems are generally by frequent replacing working roll or carry out texturing to working roll and chromium plating solves, but these methods not only can reduce cold-rolling mill operating rate, affect production schedule; And working roll texturing and chromium plating expensive, add production cost, also can cause environmental pollution simultaneously.
Along with improving constantly of requiring over-all propertieies such as cold roll wear resistance, anti-accident performances, for obtaining higher comprehensive use properties, improve Cold Work Roll Material alloying levels, make the developing direction that the higher cold roll of alloying level has become cold rolled sheet roller, forging rapid steel, semi-high speed steel cold roller become the recent development direction of cold roll material.In recent years, forge high speed steel cold roller to be used widely, for cold strip mill.
Forging high speed steel cold roller dense structure, intensity is high, anisotropy good, through forging after carbide form, distribution be obviously better than casting high speed steel cold roll.But forging high speed steel cold roller material cost, production cost and production difficulty are all apparently higher than casting high speed steel cold roll.Therefore forging rapid steel purposes in cold roll is produced is limited, can only for the manufacture of small-sized cold roll.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of large-sized forging high speed steel cold roller and manufacture method thereof, and this cold roll has high-wearing feature, high roughness retaining capability and high structure stability.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
Large-sized forging high speed steel cold roller, chemical composition in described cold roll and mass percentage thereof are: C0.90 ~ 1.20%, Si0.20 ~ 1.20%, Mn0.20 ~ 1.00%, Cr6.00 ~ 12.00%, Mo2.00 ~ 5.00%, V1.00 ~ 4.00%, W0.80 ~ 2.00%, Ni≤0.80%, P≤0.02%, S≤0.02%, all the other are Fe and inevitable impurity.
Further improvement of the present invention is: the making method of described cold roll comprises following processing step:
A, refining steel ingot: raw material is carried out preliminary melting in electric arc furnace, after melting completes, molten steel to be placed in LF refining furnace to liquid steel refining and to carry out vacuum stripping,
After liquid steel refining completes, be molded into electrode ingot, utilize electro-slag re-melting method to make ESR electroslag ingot afterwards;
B, forging steel billet: electroslag ingot obtained for steps A is made roller stock through heating, insulation, jumping-up and pulling;
C, conditioning heat treatment: conditioning heat treatment is carried out to roller stock: be first heated to 1030 DEG C of rear quenchings of insulation; Reheat air cooling to 820 DEG C of insulations, finally carry out temper, tempering temperature is 650 DEG C;
D, machining and finished heat treatment: roller stock is carried out roughing, after UT (Ultrasonic Testing) is up to the standards, continuous induction hardening is carried out to the body of roll top layer of roller stock, quenching temperature is 1100 ~ 1180 DEG C, afterwards roller stock is carried out temper: tempering temperature is to 450 ~ 550 DEG C, after insulation 30h, air cooling is to room temperature;
After tempering completes, by desired size, precision work is carried out to roller stock, make cold roll, carry out ultrasound examination, hardness test and microstructure examination.
Improvement of the present invention is also: the tempering that described step D carries out carries out three times altogether, and total soaking time of three tempering is 80h.
Owing to have employed technique scheme, the technical progress that the present invention obtains is:
In the present invention steel chemical composition in, Cr adds the hardening capacity of steel, improves the hardness of steel and wear resistance and steel can not be made to become fragile; Mo improves hardening capacity and the heat resistance of steel, prevents temper brittleness, keeps the hardness stabilization of steel, adds the drag of steel to distortion, cracking and wearing and tearing etc.The content of the carbide forming elements such as Cr, Mo, V, W of the present invention is higher, the larger Aliquation carbide Cr of formation
7c
3impart the wear resistance of cold roll excellence and high roughness retaining capability, the high rigidity carbide Mo of small and dispersed distribution
2c, VC, WC, impart cold roll matrix obtain high rigidity at high temperature tempering and there is high structure stability, ensure that large-sized forging high speed steel cold roller has excellent wear resistance, high roughness retaining capability, thus cold roll can be made not need to carry out the rolling that chromium plating just can be directly used in high-grade sheet material, in the working process of cold roll, thermal shock resistance is obviously better than conventional cold roll.
Adopt the cold roll that material of the present invention is obtained, the body of roll surface hardness of its cold roll is 88 ~ 96HSD, has excellent wear resistance, high roughness retaining capability and high structure stability.The milling train that casualty ratio of accidents is higher is applied, and the comprehensive use properties of cold roll significantly improves; Cold roll has excellent abrasion resistance properties, continuous mill after-frame and levelling machine is applied, decreases the processing step of chromium plating, greatly reduce production cost, also eliminate the environmental pollution that chromium plating causes.
Electro-slag re-melting method of the present invention is evenly directed consecutive solidification mode, avoids steel ingot center and solidifies not good, improve ingot quality.Heat treating method ensure that the performance of cold roll, and the temperature and time of its quenching, tempering, makes cold roll have optimal mechanical properties and use properties.
Embodiment
Large-sized forging high speed steel cold roller, its chemical composition and mass percentage thereof are: C0.90 ~ 1.20%, Si0.20 ~ 1.20%, Mn0.20 ~ 1.00%, Cr6.00 ~ 12.00%, Mo2.00 ~ 5.00%, V1.00 ~ 4.00%, W0.80 ~ 2.00%, Ni≤0.80%, P≤0.02%, S≤0.02%, all the other are Fe and inevitable impurity.
Above-mentioned chemical composition and mass percentage thereof can more preferably: C0.90 ~ 1.10%, Si0.60 ~ 1.00%, Mn0.60 ~ 1.00%, Cr8.00 ~ 11.00%, Mo3.00 ~ 4.00%, V2.50 ~ 3.00%, W1.00 ~ 1.50%, Ni≤0.80%, P≤0.02%, S≤0.02%.All the other are Fe and inevitable impurity.
Below in conjunction with specific embodiment, the present invention is described in further details:
Embodiment 1
Forging high speed steel cold roller and manufacture method thereof, chemical composition in described cold roll and mass percentage design objective thereof are: C0.9 ~ 1.0%, Si0.8 ~ 0.9%, Mn0.8 ~ 0.9%, Cr9.8 ~ 10.0%, Mo3.8 ~ 4.0%, V2.8 ~ 3.0%, W1.4 ~ 1.5%, Ni0.5 ~ 0.6%, P≤0.02%, S≤0.02%, all the other are Fe and inevitable impurity.
The making method of described cold roll comprises following processing step:
A, refining steel ingot: desired raw material is tentatively smelted in electric arc furnace, afterwards molten steel is placed in LF refining furnace, start to carry out refining to molten steel: LF refining temperature is 1600 ~ 1800 DEG C, under the vacuum tightness of 0 ~ 67Pa, keep 15 ~ 25min to carry out vacuum stripping.After liquid steel refining, pour into a mould, be molded into electrode ingot.
Electrode ingot is heated to 720 DEG C carry out isothermal annealing after, esr is carried out to electrode ingot and makes ESR electroslag ingot: consumable electrode and electrode ingot are all immersed in the slag bath of junker mold, pass into electric current, electric current is by electrode and electrode ingot is fused into molten metal by heating, and the bottom that the molten metal after fusing arrives junker mold is frozen into new steel ingot gradually.Again the steel ingot be frozen into is the ESR electroslag ingot finally obtained.
Carry out chemical composition analysis to electroslag ingot, the chemical composition and the mass percentage thereof that obtain electroslag ingot are: C1.0%, Si0.8%, Mn0.8%, Cr10.0%, Mo4.0%, V3.0%, W1.5%, Ni0.6%, P0.02%, S0.02%, all the other are Fe and inevitable impurity.
B, forging steel billet: electroslag ingot steps A obtained is come out of the stove after carrying out 1200 DEG C of heating and thermal insulations.By making roller stock after pressing tongs handle, jumping-up, a series of forging process of pulling.
C, conditioning heat treatment: conditioning heat treatment is carried out to roller stock: be first heated to 1030 DEG C of rear quenchings of insulation; Reheat air cooling to 820 DEG C of insulations, finally carry out temper, tempering temperature is 650 DEG C.
D, machining and finished heat treatment: roller stock size as requested is first carried out mechanical roughing, after being up to the standards by UT (Ultrasonic Testing), utilize the body of roll top layer of double frequency induction lathe to roller stock to carry out continuous induction hardening, quenching temperature is 1100 ~ 1180 DEG C.
Quenched and carried out temper to roller stock afterwards: roller stock has been heated to 450 ~ 550 DEG C, after insulation 30h, air cooling is to room temperature.Temper needs to repeat three times, three tempering insulation time 80h altogether.
After tempering completes, roller stock is required to carry out precision work according to delivery gauge, the obtained final cold roll required.Afterwards ultrasound examination, hardness test, microstructure examination are carried out to cold roll.
The body of roll top layer Shore hardness obtaining cold roll through last test is 90 ~ 96HSD, and ultrasound examination and metallographic structure all reach requirement.
Embodiment 2 ~ embodiment 5
In embodiment 2, processing step is identical with the processing step in embodiment 1, is with the difference of embodiment 1: in the present embodiment, the chemical composition of cold roll and the design objective of mass percentage thereof are:
C0.9 ~ 1.0%, Si0.8 ~ 0.9%, Mn0.8 ~ 0.9%, Cr9.8 ~ 10.0%, Mo3.8 ~ 4.0%, V2.8 ~ 3.0%, W1.4 ~ 1.5%, Ni0.5 ~ 0.6%, P≤0.015%, S≤0.015%, all the other are Fe and inevitable impurity.
Through carrying out chemical composition analysis to electroslag ingot, in electroslag ingot, chemical composition and mass percentage thereof are: C1.1%, Si0.6%, Mn0.6%, Cr11.0%, Mo3.0%, V1.0%, W0.8%, Ni0.3%, P0.014%, S0.003%, all the other are Fe and inevitable impurity.
Quenching temperature in step D is 1050 DEG C; Tempering temperature is 450 DEG C.
The body of roll top layer Shore hardness obtaining cold roll after final production completes is 88 ~ 92HSD, and ultrasound examination and metallographic structure all reach requirement.
Embodiment 3
In embodiment 3, processing step is identical with the processing step in embodiment 1, is with the difference of embodiment 1: in the present embodiment, the chemical composition of cold roll and the design objective of mass percentage thereof are:
C0.9 ~ 1.0%, Si0.9 ~ 1.0%, Mn0.4 ~ 0.5%, Cr11.5 ~ 12.0%, Mo1.8 ~ 2.0%, V3.8 ~ 4.0%, W0.9 ~ 1.0%, Ni0.35 ~ 0.45%, P≤0.01%, S≤0.01%, all the other are Fe and inevitable impurity.
Through carrying out chemical composition analysis to electroslag ingot, in electroslag ingot, chemical composition and mass percentage thereof are: C0.9%, Si1.0%, Mn0.4%, Cr12.0%, Mo2.0%, V4.0%, W1.0%, Ni0.4%, P0.01%, S0.009%, all the other are Fe and inevitable impurity.
Quenching temperature in step D is 1050 DEG C; Tempering temperature is 450 DEG C.
The body of roll top layer Shore hardness obtaining cold roll after final production completes is 90 ~ 93HSD, and ultrasound examination and metallographic structure all reach requirement.
Embodiment 4
In embodiment 4, processing step is identical with the processing step in embodiment 1, is with the difference of embodiment 1: in the present embodiment, the chemical composition of cold roll and the design objective of mass percentage thereof are:
C1.1 ~ 1.2%, Si1.1 ~ 1.2%, Mn0.2 ~ 0.3%, Cr7.5 ~ 8.0%, Mo4.8 ~ 5.0%, V2.5 ~ 3.0%, W1.1 ~ 1.2%, Ni0.05 ~ 0.15%, P≤0.02%, S≤0.018%, all the other are Fe and inevitable impurity.
Through carrying out chemical composition analysis to electroslag ingot, in electroslag ingot, chemical composition and mass percentage thereof are: C1.2%, Si1.2%, Mn0.2%, Cr8.0%, Mo5.0%, V2.8%, W1.2%, Ni0.1%, P0.018%, S0.015%, all the other are Fe and inevitable impurity.
Quenching temperature in step D is 1100 DEG C; Tempering temperature is 500 DEG C.
The body of roll top layer Shore hardness obtaining cold roll after final production completes is 92 ~ 98HSD, and ultrasound examination and metallographic structure all reach requirement.
Embodiment 5
In embodiment 5, processing step is identical with the processing step in embodiment 1, is with the difference of embodiment 1: in the present embodiment, the chemical composition of cold roll and the design objective of mass percentage thereof are:
C1.0 ~ 1.1%, Si0.2 ~ 0.3%, Mn0.9 ~ 1.0%, Cr8.5 ~ 9.0%, Mo3.5 ~ 4.0%, V2.0 ~ 2.5%, W2.0 ~ 2.5%, Ni0.7 ~ 0.8%, P≤0.015%, S≤0.01%, all the other are Fe and inevitable impurity.
Through carrying out chemical composition analysis to electroslag ingot, in electroslag ingot, chemical composition and mass percentage thereof are: C1.05%, Si0.2%, Mn1.0%, Cr9.0%, Mo3.5%, V2.5%, W2.0%, Ni0.8%, P0.013%, S0.008%, all the other are Fe and inevitable impurity.
Quenching temperature in step D is 1150 DEG C; Tempering temperature is 540 DEG C.
The body of roll top layer Shore hardness obtaining cold roll after final production completes is 92 ~ 96HSD, and ultrasound examination and metallographic structure all reach requirement.
Compared with conventional cold roll, in the course of the work, thermal shock resistance is good for the cold roll that use the present invention produces, and the work-ing life of cold roll extends, and frequently need not change cold roll again, accelerate production schedule.
Claims (2)
1. large-sized forging high speed steel cold roller, it is characterized in that chemical composition in described cold roll and mass percentage thereof are: C0.90 ~ 1.10%, Si0.60 ~ 1.00%, Mn0.60 ~ 1.00%, Cr8.00 ~ 11.00%, Mo3.00 ~ 4.00%, V2.50 ~ 3.00%, W1.00 ~ 1.50%, Ni≤0.80%, P≤0.02%, S≤0.02%, all the other are Fe and inevitable impurity;
The making method of described cold roll comprises following processing step:
A, refining steel ingot: raw material is carried out preliminary melting in electric arc furnace, after melting completes, molten steel being placed in LF refining furnace to liquid steel refining carries out vacuum stripping, LF refining temperature is 1600 ~ 1800 DEG C, keeps 15 ~ 25min to carry out vacuum stripping under the vacuum tightness of 0 ~ 67Pa;
After liquid steel refining completes, be molded into electrode ingot, utilize electro-slag re-melting method to make ESR electroslag ingot afterwards;
B, forging steel billet: electroslag ingot obtained for steps A is made roller stock through heating, insulation, jumping-up and pulling;
C, conditioning heat treatment: conditioning heat treatment is carried out to roller stock: be first heated to 1030 DEG C of rear quenchings of insulation; Reheat air cooling to 820 DEG C of insulations, finally carry out temper, tempering temperature is 650 DEG C;
D, machining and finished heat treatment: roller stock is carried out roughing, after UT (Ultrasonic Testing) is up to the standards, continuous induction hardening is carried out to the body of roll top layer of roller stock, quenching temperature is 1100 ~ 1180 DEG C, afterwards roller stock is carried out temper: tempering temperature is 450 ~ 550 DEG C, after insulation 30h, air cooling is to room temperature;
After tempering completes, by desired size, precision work is carried out to roller stock, make cold roll, carry out ultrasound examination, hardness test and microstructure examination.
2. large-sized forging high speed steel cold roller according to claim 1, is characterized in that: the tempering that described step D carries out carries out three times altogether, and total soaking time of three tempering is 80h.
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| CN104384193B (en) * | 2014-10-16 | 2016-11-23 | 中钢集团邢台机械轧辊有限公司 | The manufacture method of the high-speed steel planishing roll of wire and bar mill |
| CN105624565A (en) * | 2016-01-05 | 2016-06-01 | 中钢集团邢台机械轧辊有限公司 | Chrome-plating-free cold roll and producing method thereof |
| CN106350641A (en) * | 2016-08-31 | 2017-01-25 | 抚州申铃汽车配件有限责任公司 | Heat treatment method for improving service life of cold-working mold |
| CN106435370B (en) * | 2016-10-13 | 2018-12-04 | 宝钢轧辊科技有限责任公司 | Cold rolling high strength car sheet specialized high-speed steel roll and its manufacturing method |
| CN106756620B (en) * | 2016-11-30 | 2018-05-11 | 马鞍山市恒强合金科技有限公司 | A kind of non-ferrous metal calendering cold roll and preparation method thereof |
| CN106884118A (en) * | 2016-12-29 | 2017-06-23 | 中钢集团邢台机械轧辊有限公司 | Forging Electroslag Cladding high-speed steel roll and its manufacture method |
| CN106834969B (en) * | 2016-12-29 | 2019-09-24 | 中钢集团邢台机械轧辊有限公司 | Jobbing sheet-rolling mill working roll and its manufacturing method |
| CN107686942A (en) * | 2017-08-21 | 2018-02-13 | 宜兴市永昌轧辊有限公司 | A kind of cold roll for possessing high roughness retention property |
| CN107502713A (en) * | 2017-08-28 | 2017-12-22 | 大连冶金工具厂有限公司 | A kind of ratio-frequency welded tube unit roller processing technology |
| CN110484852A (en) * | 2019-08-02 | 2019-11-22 | 史继明 | A kind of hot-spraying technique of grain and oil machinery flour mill tungsten carbide grinding roller |
| CN113201696B (en) * | 2021-05-11 | 2022-01-21 | 江阴市瑞华机械制造有限公司 | TiN-rich iron alloy and preparation method thereof |
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| CN1064566C (en) * | 1997-02-24 | 2001-04-18 | 冶金工业部钢铁研究总院 | Centrifugal casting method for producing composite high-speed steel rollers |
| JPH11246949A (en) * | 1998-03-03 | 1999-09-14 | Hitachi Metals Ltd | High speed steel series sintered alloy excellent in cracking resistance and roll for rolling using it |
| CN101880834B (en) * | 2010-07-27 | 2012-07-04 | 中钢集团邢台机械轧辊有限公司 | Cold roll with high abrasive resistance and high roughness retaining capability and manufacturing method thereof |
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