CN108018482B - High-chromium iron roller - Google Patents
High-chromium iron roller Download PDFInfo
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- CN108018482B CN108018482B CN201711370501.9A CN201711370501A CN108018482B CN 108018482 B CN108018482 B CN 108018482B CN 201711370501 A CN201711370501 A CN 201711370501A CN 108018482 B CN108018482 B CN 108018482B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- Crystallography & Structural Chemistry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention discloses a high-chromium iron roller, which is used for a large wide and thick plate rolling mill and comprises a roller core, a roller neck and a roller body working layer, wherein the chemical components and mass percentage of the roller body working layer are C2.40-3.30%, Si 0.60-1.00%, Mn 0.90-1.20%, Cr 15.00-18.00%, Ni 1.10-1.70%, Mo 0.80-1.40%, V0.10-0.60%, S is less than or equal to 0.10%, P is less than or equal to 0.05%, and the balance is Fe and inevitable impurities. The invention improves the mechanical property of the roller, improves the wear resistance and millimeter rolling quantity of the roller and prolongs the service life of the roller by adjusting the heat treatment process.
Description
Technical Field
The invention relates to a roller, in particular to a high-chromium iron roller which is used for a 5000mm wide and thick plate mill.
Background
Since the eighties of the last century, more than ten large wide and thick plate rolling lines of more than 4000mm have been successively built in China, although the large wide and thick plates are started slowly, the wide and thick plates are more widely applied along with the rapid development of the steel industry in China and the requirements of the fields of large bridges, nuclear power plants, large dams, large ships and the like, the rapid development of the production field of the wide and thick plates is promoted, and China has developed into the world with the largest wide and thick plate production and consumption.
The rolling pressure of the large wide and thick plate rolling mill is large and can reach 8000-12000 t at most, and the rolling mode of reciprocating back and forth simultaneously enables the roller to bear higher alternating stress and larger mechanical impact. The four-roller reversing mill is a wide and thick plate mill which is most widely applied at home and abroad at present, mainly takes a single-stand or double-stand four-roller reversing mill as a main part, and is generally a high-nickel-chromium infinite chilled centrifugal composite roll, but the high-nickel-chromium material has poor wear resistance and poor roll shape retention capacity, so that the model control is influenced. Meanwhile, a questionnaire shows that the high-chromium steel roller is easy to slip after being bitten when the rough rolling frame is used for rolling, and the application effect is not ideal.
The high-chromium iron roller is made of high-chromium white wear-resistant cast iron with the carbon content of 2.3-3.3% and the chromium content of 12-22% as the outer layer material of the roller body and the nodular graphite cast ironThe cast iron is made of the materials of the roller core part and the roller neck, and the high-alloy composite cast iron roller is produced by adopting a centrifugal composite pouring process. In general, in various alloy cast iron rolls, the carbide precipitated in the outer layer structure of the roll body along with the solidification of molten iron is Fe3C-type cast iron with hardness of 840-1100 HV, and high-chromium cast iron contains a large amount of chromium, nickel, molybdenum and the like in molten iron, and carbide precipitated in the outer layer structure of the roller body during solidification of the molten iron is M7C3The hardness of the eutectic carbide can reach 1500-2000 HV, so that the high-chromium iron roller has high wear resistance and small hardness drop.
In recent years, research on high-chromium cast iron or new high-chromium cast steel materials at home and abroad is greatly advanced, but a high-chromium iron roller applied to a 5000 mm-grade wide and thick plate rolling mill is not reported.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a high-chromium iron roller which is used for a large-scale wide and thick plate rolling mill, can improve the mechanical property of the roller, improve the wear resistance and millimeter rolling quantity of the roller and prolong the service life of the roller.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a high-chromium iron roller is used for a large-scale wide and thick plate rolling mill and comprises a roller core, a roller neck and a roller body working layer, wherein the chemical components and mass percentage of the roller body working layer are C2.40-3.30%, Si 0.60-1.00%, Mn 0.90-1.20%, Cr 15.00-18.00%, Ni 1.10-1.70%, Mo 0.80-1.40%, V0.10-0.60%, S less than or equal to 0.10%, P less than or equal to 0.05%, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further improved in that the method comprises the following steps:
A. smelting: batching according to chemical components of the working layer of the roller body, and then smelting in an induction furnace at 1450-1550 ℃; smelting the roller core part by taking pig iron as a raw material in a blast furnace at 1450-1500 ℃, and adding an inoculant and a nodulizer into molten iron before discharging;
B. centrifugal casting: centrifugally casting a roller body working layer, wherein the casting temperature of molten iron is 1350-1400 ℃;
C. mould assembling and casting the core part and the roll neck: combining the sand box with the working layer of the roll body and the sand box for casting the roll neck; pouring the treated molten iron into the combined sand box, wherein the pouring temperature is 1380-1420 ℃, and obtaining a casting;
D. opening the box and cleaning sand: taking out the casting after slowly cooling in the combined sand box, and cleaning the molding sand attached to the surface;
E. and (3) heat treatment: and carrying out two-stage annealing treatment on the casting, and then cooling along with the furnace.
The technical scheme of the invention is further improved as follows: the inoculant is ferrosilicon and silicon-barium alloy, the mass percent of the inoculant in the molten iron is 0.4-0.8%, the nodulizer is rare earth magnesium alloy, and the mass percent of the nodulizer in the molten iron is 1.1-1.3%.
The technical scheme of the invention is further improved as follows: the rotation speed during centrifugation is 700-750 r/min.
The technical scheme of the invention is further improved as follows: the slow cooling time is 100-150 h.
The technical scheme of the invention is further improved as follows: in the two-stage annealing, the heating temperature of each stage of annealing process is 450-550 ℃, and the heat preservation time is 25-30 h.
The technical scheme of the invention is further improved as follows: the surface hardness of the roller is HSD 75-80.
The technical scheme of the invention is further improved as follows: the large wide and thick plate mill is a 5000mm wide and thick plate mill.
Due to the adoption of the technical scheme, the invention has the technical progress that:
the high-chromium iron roller improves the mechanical property of the roller, improves the wear resistance and millimeter rolling quantity of the roller, and prolongs the service life of the roller.
The invention can make C, Mn, Cr, Mo, V and other alloy elements in the roller play better synergistic action through reasonable design of alloy components and casting process, and the roller structure is martensite, retained austenite and carbide through proper heat treatment process, the matrix strength is higher, and simultaneously because of containing more Cr,cr to C have a high mass ratio, and the carbide type formed is M7C3Mainly formed, and the microhardness is much higher than M3And C type greatly improves the wear resistance of the roller due to the improvement of the hardness of the wear-resistant particles. In addition, when the high Cr cast iron roll is used, a layer of compact Cr is formed on the surface of the high Cr cast iron roll2O3The oxide film has compact structure, strong adhesive force and high hardness, and plays a role in protecting the roll surface, thereby increasing the wear resistance of the roll. The improvement of roll wearability can promote the work efficiency of wide and thick plate rolling mill by a wide margin.
The invention adopts a centrifugal casting mode for production, the working layer and the core part of the roller adopt different materials and different smelting processes, and then the working layer and the core part are compounded together by a centrifugal casting method, so that the high hardness and high wear resistance of the surface layer are ensured, the toughness of the core part of the roller is ensured, the surface quality of the roller is improved, and the service life of the roller is prolonged.
When the working layer of the roller body is poured, the rotating speed of the centrifugal machine is controlled to be 700-750 r/min, so that the working layer of the roller body has higher density in the pouring process, and the wear resistance of the roller is improved.
The slow cooling time of the casting in the sand box is 100-150 hours, so that the uniform cooling of the casting is ensured, and the cracking is avoided.
The annealing heat preservation time is 25-30 h, sufficient time is provided for precipitation of carbide, the carbide plays a role in dispersion strengthening on the working layer of the roller body, the hardness and the wear resistance of the working layer of the roller body are further improved, and the service life of the roller is prolonged. The heat treatment adopts a slow cooling process, the total heat treatment time reaches 170-200 h, the uniform change of the roller body structure is ensured, no obvious transition layer exists, the surface hardness of the roller body is uniform, the hardness fall in a working layer is extremely small, and the wear resistance of the roller is good.
Drawings
FIG. 1 is a metallographic structure examination result of a non-defective article obtained in example 1;
FIG. 2 is a metallographic structure examination result of a non-defective article obtained in example 2;
FIG. 3 is the metallographic structure examination result of a non-defective article obtained in example 3;
FIG. 4 shows the results of metallographic structure examination of a sample of non-defective products in example 4.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
a high-chromium iron roller comprises the following specific implementation steps:
A. smelting: proportioning according to chemical components of a roll body working layer, wherein the chemical components of the roll body working layer and the mass percentage content of the chemical components are C2.40-3.30%, Si 0.60-1.00%, Mn 0.90-1.20%, Cr 15.00-18.00%, Ni 1.10-1.70%, Mo 0.80-1.40%, V0.10-0.60%, S is less than or equal to 0.10%, P is less than or equal to 0.05%, and the balance is Fe and inevitable impurities, smelting in an induction furnace, and the smelting temperature is 1450-1550 ℃; smelting a roller core part by taking pig iron as a raw material in a blast furnace at 1450-1500 ℃, adding an inoculant and a nodulizer into molten iron before tapping, wherein the inoculant is ferrosilicon and silicon-barium alloy, the weight of the inoculant accounts for 0.4-0.8% of the weight of the molten iron, the nodulizer is rare earth magnesium alloy, and the weight of the nodulizer accounts for 1.1-1.3% of the weight of the molten iron;
B. centrifugal casting: centrifugally pouring the working layer of the roller body, wherein the pouring temperature of molten iron is 1350-1400 ℃, and the rotating speed of a centrifugal machine during pouring is 700-750 r/min;
C. mould assembling and casting the core part and the roll neck: combining the sand box with the working layer of the roll body and the sand box for casting the roll neck; pouring the treated molten iron into the combined sand box, wherein the pouring temperature is 1380-1420 ℃, and obtaining a casting;
D. boxing and sand removal: slowly cooling the casting in a sand box for 100-150 hours, opening the sand box to take out the casting, and cleaning molding sand attached to the surface of the casting;
E. and (3) heat treatment: and carrying out two-stage annealing treatment on the casting, wherein the heating temperature in each stage of annealing process in the two-stage annealing is 450-550 ℃, the heat preservation time is 25-30 h, and then cooling along with the furnace.
The prepared roller has surface hardness of HSD 75-80 and is applied to a 5000mm wide and thick plate rolling mill.
Example 1
The design target of the components of the working layer of the roller body in the embodiment is C2.40-2.60%, Si 0.60-0.70%, Mn 1.10-1.20%, Cr 15.00-16.00%, Ni 1.50-1.70%, Mo 1.20-1.40%, V0.30-0.50%, S is less than or equal to 0.05%, P is less than or equal to 0.05%, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps:
A. smelting: proportioning according to chemical components of a working layer of a roller body, and smelting in an induction furnace at 1450 ℃;
smelting a roller core part in a blast furnace by taking pig iron as a raw material at 1450 ℃, adding an inoculant and a nodulizer into molten iron before discharging, wherein the inoculant is ferrosilicon and silicon-barium alloy, the weight of the inoculant accounts for 0.4 percent of the weight of the molten iron, the nodulizer is rare earth magnesium alloy, and the weight of the nodulizer accounts for 1.1 percent of the weight of the molten iron;
B. centrifugal casting: centrifugally pouring the working layer of the roller body, wherein the pouring temperature of molten iron is 1350 ℃, and the rotating speed of a centrifugal machine during pouring is 700 r/min;
C. mould assembling and casting the core part and the roll neck: combining the sand box with the working layer of the roll body and the sand box for casting the roll neck; pouring the treated molten iron into the combined sand box, wherein the pouring temperature is 1380 ℃;
D. boxing and sand removal: after the casting is slowly cooled in the sand box for 100 hours, opening the sand box to take out the casting, and cleaning the molding sand attached to the surface of the casting;
E. and (3) heat treatment: and (3) carrying out two-section annealing treatment on the casting, wherein the annealing temperature of each section is 450 ℃, the heat preservation time is 30 hours, and then cooling along with the furnace.
And B, analyzing the chemical components of the molten iron in the step A to obtain the refined molten iron, wherein the chemical components and the mass percentage content of the refined molten iron are C2.56%, Si 0.69%, Mn 1.05%, Cr 15.00%, Ni 1.68%, Mo 1.37%, V0.31%, S0.015%, P0.035%, and the balance of Fe and inevitable impurities.
Through detection, the surface hardness of the finally prepared roller is HSD 75-79, and the detection result of the hardness fall is within 3 HSD.
In the present embodiment, the metallurgical structure of the qualified product is shown in fig. 1.
Examples 2-4 have the same roll body work layer composition as in example 1 above, except that the composition is in mass percent, the design goals for each composition are shown in table 1 below, the manufacturing process steps for examples 2-4 are the same as for example 1 above, and the process parameters are shown in the manufacturing process section below in table 1.
TABLE 1
Through detection, the chemical components of the molten iron refined in each example and the surface hardness of the finally prepared roller are shown in table 2:
TABLE 2
| Example 2 | Example 3 | Example 4 | |
| C(wt％) | 2.54 | 2.75 | 3.15 |
| Si(wt％) | 0.66 | 0.78 | 0.85 |
| Mn(wt％) | 1.15 | 1.01 | 0.98 |
| Cr(wt％) | 15.40 | 16.50 | 17.65 |
| Ni(wt％) | 1.17 | 1.35 | 1.69 |
| Mo(wt％) | 1.19 | 0.88 | 1.45 |
| V(wt％) | 0.23 | 0.45 | 0.50 |
| S(wt％) | 0.016 | 0.014 | 0.013 |
| P(wt％) | 0.035 | 0.030 | 0.034 |
| Hardness (HSD) | 75～79 | 77～79 | 78～80 |
Compared with the example 2, the open time of the box is shortened, the pearlite content in the cast structure is favorably reduced, and the metallographic structure of the product shown in the example 1 is obviously reduced in the as-cast state, and the structure is more uniform and compact after heating.
The embodiments 1 to 4 are respectively applied to different rolling lines, and compared with a high nickel-chromium roller used in the same period, the using effect is greatly improved in millimeter kilometers, and the specific values are shown in table 3:
TABLE 3
| Example 1 | Example 2 | Example 3 | Example 4 | |
| High nickel chromium millimeter kilometer | 43 | 56 | 58 | 50 |
| High chromium iron millimeter kilometer | 83 | 96 | 106 | 120 |
| Multiple of effect | 1.93 | 1.71 | 1.83 | 2.40 |
Claims (6)
1. The high-chromium iron roller is used for a large wide and thick plate rolling mill and comprises a roller core, a roller neck and a roller body working layer, and is characterized in that: the roll body working layer comprises the following chemical components, by mass, 2.40-3.30% of C, 0.60-1.00% of Si, 0.90-1.20% of Mn, 15.00-18.00% of Cr15, 1.10-1.70% of Nis, 0.80-1.40% of Mos, 0.10-0.60% of V, less than or equal to 0.10% of S, less than or equal to 0.05% of P, and the balance of Fe and inevitable impurities;
the manufacturing method comprises the following steps:
A. smelting: batching according to chemical components of the working layer of the roller body, and then smelting in an induction furnace at 1450-1550 ℃; smelting the roller core part by taking pig iron as a raw material in a blast furnace at 1450-1500 ℃, and adding an inoculant and a nodulizer into molten iron before discharging;
B. centrifugal casting: centrifugally casting a roller body working layer, wherein the casting temperature of molten iron is 1350-1400 ℃;
C. mould assembling and casting the core part and the roll neck: combining the sand box with the working layer of the roll body and the sand box for casting the roll neck; pouring the treated molten iron into the combined sand box, wherein the pouring temperature is 1380-1420 ℃, and obtaining a casting;
D. opening the box and cleaning sand: taking out the casting after slowly cooling in the combined sand box, and cleaning the molding sand attached to the surface;
E. and (3) heat treatment: carrying out two-section annealing treatment on the casting, and then cooling along with the furnace;
the surface hardness of the roller is HSD 75-80.
2. A high chromium iron roll according to claim 1 wherein: the inoculant is ferrosilicon and silicon-barium alloy, the mass percent of the inoculant in the molten iron is 0.4-0.8%, the nodulizer is rare earth magnesium alloy, and the mass percent of the nodulizer in the molten iron is 1.1-1.3%.
3. A high chromium iron roll according to claim 1 wherein: the rotation speed during centrifugation is 700-750 r/min.
4. A high chromium iron roll according to claim 1 wherein: the slow cooling time is 100-150 h.
5. A high chromium iron roll according to claim 1 wherein: in the two-stage annealing, the heating temperature of each stage of annealing process is 450-550 ℃, and the heat preservation time is 25-30 h.
6. A high chromium iron roll according to claim 1 wherein: the large wide and thick plate mill is a 5000mm wide and thick plate mill.
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| CN108018482B true CN108018482B (en) | 2020-12-29 |
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| CN108588322A (en) * | 2018-08-06 | 2018-09-28 | 龚晓俅 | A kind of manufacturing method of high carbon ferro-chrome ball |
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| CN109536825B (en) * | 2018-12-28 | 2021-03-30 | 中钢集团邢台机械轧辊有限公司 | Cast iron material temper mill working roll and manufacturing method thereof |
| CN110508786A (en) * | 2019-09-24 | 2019-11-29 | 济南市白象科技发展有限公司 | A kind of composite roller |
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| CN111922321A (en) * | 2020-10-14 | 2020-11-13 | 常州凯达重工科技有限公司 | High-chromium cast iron roller and manufacturing method of bottom pouring type high-chromium cast iron roller |
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| JPS5376119A (en) * | 1976-12-17 | 1978-07-06 | Hitachi Metals Ltd | Highhhardness highhchrome roll and method of making same |
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