CN111118276A - Heat treatment process for ultra-deep quench-hardened cold roll - Google Patents
Heat treatment process for ultra-deep quench-hardened cold roll Download PDFInfo
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- CN111118276A CN111118276A CN202010029372.2A CN202010029372A CN111118276A CN 111118276 A CN111118276 A CN 111118276A CN 202010029372 A CN202010029372 A CN 202010029372A CN 111118276 A CN111118276 A CN 111118276A
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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
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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Abstract
The invention discloses an ultra-deep hardening cold-rolling roller and a heat treatment process thereof, wherein the outer layer of the ultra-deep hardening cold-rolling roller consists of the following chemical components: 2-3% of Cr, Mo: 7% -10%, Ti: 1-2%, Sr 2-3%, Co 1-2%, W2-4%, Mg: 0.5% -1%, Zn: 2% -3%, Si: 2-4%, Cu 1-1.5%, microcrystalline graphite: 1 to 1.5 percent of the total chemical components, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of B, and the balance of Fe and modificator, wherein the total chemical components is 100 percent; after the heat treatment process of the invention, the cold roll has high hardness, large depth of hardening layer, no roll breaking and peeling phenomena in use, can reduce roll consumption, improve the operation rate of a rolling mill, prolong the roll changing period, improve the surface quality of rolled materials, and has good economic and social benefits.
Description
Technical Field
The invention belongs to the field of roller production, and particularly relates to an ultra-deep quench-hardened cold roller and a heat treatment process thereof.
Technical Field
The metallurgical roller is a necessary main part of metal rolling equipment, and is used as a special tool for making metal produce plastic deformation and rolling various rolled products. The service conditions of the roller are special, the consumption is high, and the service conditions are related to the quality cost of rolled stock, so that high requirements are put on the service performance of the roller. The roll is subjected to high stress during the use process, particularly the surface of the roll is subjected to friction, abrasion, impact, contact stress, fatigue caused by chilling shock and the like for a long time, and the roll is required to have better fracture resistance, wear resistance, peeling resistance, thermal cracking resistance, thermal shock resistance and the like.
China began to produce casting rolls in batches from the 30's of the 20 th century, but the varieties were rare. The first specialty roll mill in China was built by the North Schchen platform in the last 50 s. The Anshan iron and steel company was first internationally tried in 1958 and used 1050 large ductile iron rolls for roughing. Successfully cold-rolled work rolls and large forged steel rolls were manufactured successively in the 60 s. The taiyuan iron and steel company and the Beijing general iron and Steel research institute of the last 70 years together trial-manufacture centrifugal cast iron rolls for a steckel mill and a hot continuous rolling wide strip steel unit, and the chen table metallurgical machinery roll company Limited tries to manufacture semi-steel work rolls for a power hot wide strip steel mill and work rolls for a cold rolling wide strip steel mill. In 80 years, Chinese successively developed new varieties of large forged steel supporting rollers, forged semi-steel and forged white cast iron rollers, powdered tungsten carbide roller rings, high-chromium cast iron rollers and the like. At present, the roller production in China basically meets the domestic requirements and has partial export, but the variety needs to be increased, the quality needs to be improved, and particularly, the research and development of the technology for improving the depth of a hardening layer and the depth of an equal hardening layer is urgent.
Disclosure of Invention
Aiming at the defects, the invention discloses an ultra-deep quench-hardened cold roll, a production method and a heat treatment process thereof.
The first aspect of the present invention, an ultra-deep-hardened cold-rolled roll, is described below.
The ultra-deep quenched cold-rolling roller comprises the following chemical components in percentage by weight: 2-3% of Cr, Mo: 7% -10%, Ti: 1-2%, Sr 2-3%, Co 1-2%, W2-4%, Mg: 0.5% -1%, Zn: 2% -3%, Si: 2-4%, Cu 1-1.5%, microcrystalline graphite: 1 to 1.5 percent of the total chemical components, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of B, and the balance of Fe and alterant, wherein the total chemical components is 100 percent.
Because of the addition of titanium, chromium, cobalt, molybdenum and other alloy elements and the presence of a small amount of fine graphite, the stripping resistance, the thermal cracking resistance, the abrasion resistance and other properties of the roller are improved, and the working layer of the roller body has smaller hardness drop. The fine graphite pores on the surface can also improve the gripping ability of the roller.
Further, the chemical components and percentages of the outer layer of the ultra-deep hardening layer cold roll are as follows: :2.5% of Cr, Mo: 8.5%, Ti: 1.5%, Sr 2.5%, Co 1.5%, W3%, Mg: 0.75%, Zn: 2.5%, Si: 3%, Cu 1.25%, microcrystalline graphite: 1.25 percent, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of B, the balance of Fe and alterant, and the total of chemical components is 100 percent.
C is a basic element for forming wear-resistant phase carbide in the high-speed steel roller,
next, the second aspect of the present invention, a method for producing the above ultra-deep hardened cold roll, will be described.
The preparation method of the ultra-deep quench-hardened cold roll comprises the following steps:
(1) mixing metal raw materials according to chemical components, putting into an electric furnace, and heating and melting at 1300 ℃;
(2) detecting chemical components after melting, then precisely fine-adjusting the chemical components to a target value, raising the temperature to 1500 ℃, and discharging after composite deoxidation;
(3) crushing the alterant into small blocks with the granularity of less than 10mm, drying at 250 ℃, and then putting into the blocks for modification;
(4) after modification, when the temperature is reduced to 1350-1400 ℃, casting the outer layer of the roller;
(5) after the casting of the outer layer of the roller is finished, when the temperature of the inner surface of the roller is 1050-1100 ℃, casting high-strength cast iron molten iron at the roller core part of the roller to form a roller blank;
(6) and (3) mechanically processing and thermally treating the roller blank to obtain the ultra-deep quenched hard layer cold roller.
Further, the preparation method of the ultra-deep hardening layer cold roll is optimized as the following steps:
(1) mixing metal raw materials according to chemical components, putting into an electric furnace, and heating and melting at 1300 ℃;
(2) detecting chemical components after melting, then precisely fine-adjusting the chemical components to a target value, raising the temperature to 1500 ℃, and discharging after composite deoxidation;
(3) crushing the alterant into small blocks with the granularity of less than 10mm, drying at 250 ℃, and then putting into the blocks for modification;
(4) after modification, when the temperature is reduced to 1370 ℃, casting the outer layer of the roller;
(5) after the outer layer of the roller is cast, when the temperature of the inner surface of the roller is 1070 ℃, casting high-strength molten iron of cast iron at the roller core part of the roller to form a roller blank;
(6) and (3) mechanically processing and thermally treating the roller blank to obtain the ultra-deep quenched hard layer cold roller.
The method has simple and energy-saving manufacturing process, the processing temperature of the method is lower than that of the common roller by 100-
Furthermore, in the preparation method of the ultra-deep quench-hardened cold roll, the modifier is selected from yttrium-based heavy rare earth wear-resistant alloy cast iron modifiers, and the input amount of the modifier is 0.15%.
The yttrium-based heavy rare earth wear-resistant alloy cast iron modifier has a strong function of strengthening a grain boundary, can reduce segregation of harmful inclusions in the grain boundary, improve the form, size and distribution of inclusions, reduce stress concentration and crack sources, improve the bonding strength of the grain boundary, achieve the function of strengthening the grain boundary, thereby improving the strength and toughness of materials, reducing fatigue wear, micro-cutting and spalling wear, increasing supercooling and refining grains, obviously improving the form and distribution of carbides, and enabling original reticular, strip and plate-shaped carbides to become discontinuous, isolated, granular or nodular carbides and be uniformly distributed, thereby improving the strength, toughness and wear resistance of the materials.
The third aspect of the present invention, the heat treatment process of the ultra-deep hardened cold roll is described below.
The heat treatment of the step (6) in the preparation method of the ultra-deep hardened cold-rolled roller comprises the following steps:
(1) quenching: quenching and heating temperature is 800-900 ℃, and heat preservation time is 1-2 hours; when quenching and cooling are carried out, firstly water mist is cooled for 30 minutes, then air cooling is carried out,
(2) air cooling is carried out until the temperature of the roller surface is lower than 150-180 ℃, the roller surface is put into a heating furnace for carrying out first tempering treatment, the tempering heating speed is more than or equal to 90 ℃/h, the tempering heating temperature is 600-660 ℃, the roller surface is kept warm for 2-4 hours and then air cooling is carried out, when the temperature of the roller surface is lower than 150-180 ℃, the roller surface is put into the heating furnace for carrying out second tempering treatment, the tempering heating speed is more than or equal to 150 ℃/h, the tempering heating temperature is 650-750 ℃, the roller surface is kept warm for 15-20 hours and then cooled, and when the.
Further, in the above method for manufacturing an ultra-deep hardened cold-rolled roller, the heat treatment of the step (6) is optimized as follows:
(1) quenching: the quenching heating temperature is 850 ℃, and the heat preservation time is 1.5 hours; when quenching and cooling are carried out, firstly water mist is cooled for 30 minutes, then air cooling is carried out,
(2) air cooling is carried out until the temperature of the roller surface is lower than 160 ℃, the roller surface is put into a heating furnace to carry out first tempering treatment, the tempering temperature rise speed is 100 ℃/h, the tempering temperature is 630 ℃, the roller surface is kept warm for 3 hours and then air cooling is carried out, when the temperature of the roller surface is lower than 160 ℃, the roller surface is put into the heating furnace to carry out second tempering treatment, the tempering temperature rise speed is 160 ℃/h, the tempering temperature is 700 ℃, the roller surface is kept warm for 18 hours and then furnace cooling is carried out, and when the furnace temperature is lower.
Compared with the prior art, the invention has the following beneficial effects:
(1) the heat treatment process used by the invention has the advantages that through twice tempering, the thickness of the hardened layer of the material containing 2.5% of Cr is more than 50mm and is close to the depth of the roller hardened layer of the material containing 7% of Cr, a large amount of cost is saved, meanwhile, after twice tempering, the austenitization in the roller material is more sufficient, and the hardness uniformity of the roller hardened layer can reach less than or equal to 1.5 HSD.
(2) The invention has reasonable and novel proportion, simple and energy-saving manufacturing process, 200 ℃ lower processing temperature than the outer layer of the common roller by 100-.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
The ultra-deep hardening cold roll is characterized in that the chemical components and the percentage of the outer layer of the ultra-deep hardening cold roll are as follows: 2% of Cr, Mo: 10%, Ti: 1%, Sr 3%, Co 1%, W2%, Mg: 1%, Zn: 2%, Si: 4%, Cu 1%, microcrystalline graphite: 1 percent of S is less than or equal to 0.05 percent of B is less than or equal to 0.03 percent of B, the balance is Fe and modificator, and the total amount of chemical components is 100 percent.
Example 2
The ultra-deep hardening cold roll is characterized in that the chemical components and the percentage of the outer layer of the ultra-deep hardening cold roll are as follows: 3% of Cr, Mo: 7%, Ti: 2%, Sr 2%, Co 2%, W4%, Mg: 0.5%, Zn: 3%, Si: 2%, Cu 1.5%, microcrystalline graphite: 1.5 percent of S is less than or equal to 0.05 percent of B is less than or equal to 0.03 percent of B, the balance is Fe and alterant, and the total amount of chemical components is 100 percent.
Example 3
The ultra-deep hardening cold roll is characterized in that the chemical components and the percentage of the outer layer of the ultra-deep hardening cold roll are as follows: 2.5% of Cr, Mo: 8.5%, Ti: 1.5%, Sr 2.5%, Co 1.5%, W3%, Mg: 0.75%, Zn: 2.5%, Si: 3%, Cu 1.25%, microcrystalline graphite: 1.25 percent, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of B, the balance of Fe and alterant, and the total of chemical components is 100 percent.
Example 4
Preparation example
The method for manufacturing the ultra-deep hardened cold roll described in the above examples 1 to 3 includes the steps of:
(1) mixing metal raw materials according to chemical components, putting into an electric furnace, and heating and melting at 1300 ℃;
(2) detecting chemical components after melting, then precisely fine-adjusting the chemical components to a target value, raising the temperature to 1500 ℃, and discharging after composite deoxidation;
(3) crushing the yttrium-based heavy rare earth wear-resistant alloy cast iron modifier accounting for 0.15 percent of the total mass to small blocks with the granularity of less than 10mm, drying at 250 ℃ and then putting into the small blocks for modification;
(4) when the temperature is reduced to 1350 ℃ after the modification is finished, casting the outer layer of the roller;
(5) after the casting of the outer layer of the roller is finished, when the temperature of the inner surface of the roller is 1050 ℃, casting high-strength cast iron molten iron at the roller core part of the roller to form a roller blank;
(6) and (3) mechanically processing and thermally treating the roller blank to obtain the ultra-deep quenched hard layer cold roller.
Example 5
Preparation example
The method for manufacturing the ultra-deep hardened cold roll described in the above examples 1 to 3 includes the steps of:
(1) mixing metal raw materials according to chemical components, putting into an electric furnace, and heating and melting at 1300 ℃;
(2) detecting chemical components after melting, then precisely fine-adjusting the chemical components to a target value, raising the temperature to 1500 ℃, and discharging after composite deoxidation;
(3) crushing the yttrium-based heavy rare earth wear-resistant alloy cast iron modifier accounting for 0.15 percent of the total mass to small blocks with the granularity of less than 10mm, drying at 250 ℃ and then putting into the small blocks for modification;
(4) after modification, when the temperature is reduced to 1375 ℃, casting the outer layer of the roller;
(5) after the casting of the outer layer of the roller is finished, when the temperature of the inner surface of the roller is 1075 ℃, casting high-strength cast iron molten iron at the roller core part of the roller to form a roller blank;
(6) and (3) mechanically processing and thermally treating the roller blank to obtain the ultra-deep quenched hard layer cold roller.
Example 6
Preparation example
The method for manufacturing the ultra-deep hardened cold roll described in the above examples 1 to 3 includes the steps of:
(1) mixing metal raw materials according to chemical components, putting into an electric furnace, and heating and melting at 1300 ℃;
(2) detecting chemical components after melting, then precisely fine-adjusting the chemical components to a target value, raising the temperature to 1500 ℃, and discharging after composite deoxidation;
(3) crushing the yttrium-based heavy rare earth wear-resistant alloy cast iron modifier accounting for 0.15 percent of the total mass to small blocks with the granularity of less than 10mm, drying at 250 ℃ and then putting into the small blocks for modification;
(4) after the modification is finished, when the temperature is reduced to 1400 ℃, casting the outer layer of the roller;
(5) after the casting of the outer layer of the roller is finished, when the temperature of the inner surface of the roller is 1100 ℃, casting high-strength cast iron molten iron on the roller core part of the roller to form a roller blank;
(6) and (3) mechanically processing and thermally treating the roller blank to obtain the ultra-deep quenched hard layer cold roller.
Example 7
Examples of Heat treatment
The method for manufacturing the ultra-deep hardened cold-rolled roller as described in examples 4 to 6 above, wherein the heat treatment in the step (6) comprises the steps of:
(1) quenching: the quenching heating temperature is 800 ℃, and the heat preservation time is 1 hour; when quenching and cooling are carried out, firstly water mist is cooled for 30 minutes, then air cooling is carried out,
(2) air cooling is carried out until the temperature of the roller surface is lower than 150 ℃, the roller surface is put into a heating furnace to carry out first tempering treatment, the tempering temperature rise speed is 90 ℃/h, the tempering temperature is 600 ℃, the roller surface is kept warm for 2 hours and then air cooling is carried out, when the temperature of the roller surface is lower than 150 ℃, the roller surface is put into the heating furnace to carry out second tempering treatment, the tempering temperature rise speed is 150 ℃/h, the tempering temperature is 650 ℃, the roller surface is kept warm for 15 hours and then furnace cooling is carried out, and when the furnace temperature is lower.
Example 8
Examples of Heat treatment
(1) Quenching: the quenching heating temperature is 850 ℃, and the heat preservation time is 1.5 hours; when quenching and cooling are carried out, firstly water mist is cooled for 30 minutes, then air cooling is carried out,
(2) air cooling is carried out until the temperature of the roller surface is lower than 165 ℃, the roller surface is placed into a heating furnace to carry out first tempering treatment, the tempering temperature rise speed is 100 ℃/h, the tempering temperature is 630 ℃, the roller surface is kept warm for 3 hours and then air cooling is carried out, when the temperature of the roller surface is lower than 165 ℃, the roller surface is placed into the heating furnace to carry out second tempering treatment, the tempering temperature rise speed is 160 ℃/h, the tempering temperature is 700 ℃, the roller surface is kept warm for 18 hours and then furnace cooling is carried out, and when the temperature of the.
Example 9
Examples of Heat treatment
(1) Quenching: the quenching heating temperature is 900 ℃, and the heat preservation time is 2 hours; when quenching and cooling are carried out, firstly water mist is cooled for 30 minutes, then air cooling is carried out,
(2) air cooling is carried out until the temperature of the roller surface is lower than 180 ℃, the roller surface is put into a heating furnace to carry out first tempering treatment, the tempering temperature rise speed is 110 ℃/h, the tempering temperature is 660 ℃, the roller surface is kept for 4 hours and then air cooling is carried out, when the temperature of the roller surface is lower than 180 ℃, the roller surface is put into the heating furnace to carry out second tempering treatment, the tempering temperature rise speed is 170 ℃/h, the tempering temperature is 750 ℃, the roller surface is kept for 20 hours and then furnace cooling is carried out, and when the furnace temperature is lower than 150.
Example 10
Test example, using the formulation of example 2, rolls were produced using the method of example 5 and surface treated using the heat treatment process of examples 7-9, and the resulting cold rolls had performance data as shown in Table 1 below, which was obtained from GB/T1504-2008 (cast iron rolls)
TABLE 1 performance index of the rolls produced according to the invention
As can be seen from the data in the above table, the cold roll produced by the heat treatment of the present invention has good surface hardness, excellent hardness uniformity, ideal depth of hardened layer and tensile strength, and impact toughness.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. The ultra-deep hardening cold roll is characterized in that the chemical components and the percentage of the outer layer of the ultra-deep hardening cold roll are as follows: 2-3% of Cr, Mo: 7% -10%, Ti: 1-2%, Sr 2-3%, Co 1-2%, W2-4%, Mg: 0.5% -1%, Zn: 2% -3%, Si: 2-4%, Cu 1-1.5%, microcrystalline graphite: 1 to 1.5 percent of the total chemical components, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of B, and the balance of Fe and alterant, wherein the total chemical components is 100 percent.
2. The ultra-deep hardened cold roll according to claim 1, characterized in that the chemical composition and percentage of the outer layer of the ultra-deep hardened cold roll are as follows: 2.5% of Cr, Mo: 8.5%, Ti: 1.5%, Sr 2.5%, Co 1.5%, W3%, Mg: 0.75%, Zn: 2.5%, Si: 3%, Cu 1.25%, microcrystalline graphite: 1.25 percent, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of B, the balance of Fe and alterant, and the total of chemical components is 100 percent.
3. The method of manufacturing an ultra-deep hardened cold roll according to claim 1, comprising the steps of:
(1) mixing metal raw materials according to chemical components, putting into an electric furnace, and heating and melting at 1300 ℃;
(2) detecting chemical components after melting, then precisely fine-adjusting the chemical components to a target value, raising the temperature to 1500 ℃, and discharging after composite deoxidation;
(3) crushing the alterant into small blocks with the granularity of less than 10mm, drying at 250 ℃, and then putting into the blocks for modification;
(4) after modification, when the temperature is reduced to 1350-1400 ℃, casting the outer layer of the roller;
(5) after the casting of the outer layer of the roller is finished, when the temperature of the inner surface of the roller is 1050-1100 ℃, casting high-strength cast iron molten iron at the roller core part of the roller to form a roller blank;
(6) and (3) mechanically processing and thermally treating the roller blank to obtain the ultra-deep quenched hard layer cold roller.
4. The method of manufacturing an ultra-deep hardened cold roll according to claim 3, comprising the steps of:
(1) mixing metal raw materials according to chemical components, putting into an electric furnace, and heating and melting at 1300 ℃;
(2) detecting chemical components after melting, then precisely fine-adjusting the chemical components to a target value, raising the temperature to 1500 ℃, and discharging after composite deoxidation;
(3) crushing the alterant into small blocks with the granularity of less than 10mm, drying at 250 ℃, and then putting into the blocks for modification;
(4) after modification, when the temperature is reduced to 1370 ℃, casting the outer layer of the roller;
(5) after the outer layer of the roller is cast, when the temperature of the inner surface of the roller is 1070 ℃, casting high-strength molten iron of cast iron at the roller core part of the roller to form a roller blank;
(6) and (3) mechanically processing and thermally treating the roller blank to obtain the ultra-deep quenched hard layer cold roller.
5. The method for manufacturing an ultra-deep quench hardening cold roll according to claim 4, wherein the modifier is selected from yttrium-based heavy rare earth wear-resistant alloy cast iron modifiers, and the amount of the modifier added is 0.15%.
6. The method for producing an ultra-deep hardened cold-rolled sheet according to any one of claims 3 to 5, wherein said heat treatment in said step (6) comprises the steps of:
(1) quenching: quenching and heating temperature is 800-900 ℃, and heat preservation time is 1-2 hours; when quenching and cooling are carried out, firstly water mist is cooled for 30 minutes, then air cooling is carried out,
(2) air cooling is carried out until the temperature of the roller surface is lower than 150-180 ℃, the roller surface is put into a heating furnace for carrying out first tempering treatment, the tempering heating speed is more than or equal to 90 ℃/h, the tempering heating temperature is 600-660 ℃, the roller surface is kept warm for 2-4 hours and then air cooling is carried out, when the temperature of the roller surface is lower than 150-180 ℃, the roller surface is put into the heating furnace for carrying out second tempering treatment, the tempering heating speed is more than or equal to 150 ℃/h, the tempering heating temperature is 650-750 ℃, the roller surface is kept warm for 15-20 hours and then cooled, and when the.
7. The method for manufacturing an ultra-deep hardened cold-rolled sheet according to claim 6, wherein said heat treatment in said step (6) comprises the steps of:
(1) quenching: the quenching heating temperature is 850 ℃, and the heat preservation time is 1.5 hours; when quenching and cooling are carried out, firstly water mist is cooled for 30 minutes, then air cooling is carried out,
(2) air cooling is carried out until the temperature of the roller surface is lower than 160 ℃, the roller surface is put into a heating furnace to carry out first tempering treatment, the tempering temperature rise speed is 100 ℃/h, the tempering temperature is 630 ℃, the roller surface is kept warm for 3 hours and then air cooling is carried out, when the temperature of the roller surface is lower than 160 ℃, the roller surface is put into the heating furnace to carry out second tempering treatment, the tempering temperature rise speed is 160 ℃/h, the tempering temperature is 700 ℃, the roller surface is kept warm for 18 hours and then furnace cooling is carried out, and when the furnace temperature is lower.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115216586A (en) * | 2022-05-31 | 2022-10-21 | 中钢集团邢台机械轧辊有限公司 | Smelting method of steel for cold roll |
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