CN117051333B - Forged steel supporting roller and preparation method thereof - Google Patents
Forged steel supporting roller and preparation method thereof Download PDFInfo
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- CN117051333B CN117051333B CN202311318933.0A CN202311318933A CN117051333B CN 117051333 B CN117051333 B CN 117051333B CN 202311318933 A CN202311318933 A CN 202311318933A CN 117051333 B CN117051333 B CN 117051333B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 68
- 239000010959 steel Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 93
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 238000010791 quenching Methods 0.000 claims abstract description 34
- 230000000171 quenching effect Effects 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 33
- 238000003723 Smelting Methods 0.000 claims description 19
- 238000005242 forging Methods 0.000 claims description 19
- 238000003754 machining Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 7
- 239000012300 argon atmosphere Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 5
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005266 casting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B29/00—Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls ; Roll bending devices, e.g. hydraulic actuators acting on roll shaft ends
-
- 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
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to the technical field of metal materials, and relates to a forged steel supporting roller and a preparation method thereof, wherein the forged steel supporting roller is placed in a heating furnace, is heated to 890-960 ℃, is insulated for 18-24 h, is cooled to 560-600 ℃ and is insulated for 96-144 h, is cooled to 180-200 ℃ and is discharged from the furnace for air cooling; and placing the qualified support roller in a heating furnace, heating to 980-1020 ℃, preserving heat for 12-24 h, discharging, quenching with oil for 6-12 h, placing in the heating furnace after quenching with oil, heating to 520-540 ℃, preserving heat for 30-42 h, discharging, and air cooling. The surface hardness of the forged steel supporting roll with the diameter of 1.2-1.4 m is 82-88 HSD, the uniformity of the surface hardness is less than or equal to 1.5HSD, and the thickness of the quenching layer is more than or equal to 150mm.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a forged steel supporting roller and a preparation method thereof.
Background
The backup roll is used for supporting the intermediate roll and/or the working roll, is a key component for ensuring the rigidity of the working roll and the rolling dimensional precision of a product, and has an important position in the material rolling forming process. In addition to the supporting and driving functions, the supporting roller is also subjected to larger contact stress, impact and cold-hot cycle stress in the working process, so that the supporting roller is required to have excellent comprehensive mechanical properties, thermal shock resistance and the like. The 50Cr5NiMoV steel contains higher alloy content, and Cr, mo and V are carbide forming elements, so that the hardenability and hardenability of the steel can be improved to different degrees, but the existing 50Cr5NiMoV steel is often accompanied with cracking phenomena caused by cracks, and the performances of surface hardness, fracture resistance and the like of the existing support roll can not meet the actual requirements along with the continuous improvement of the processing technology requirements, so that the development of a new forged steel support roll is imperative.
Disclosure of Invention
In order to solve the problems in the prior art, the main purpose of the invention is to provide a forged steel supporting roll and a preparation method thereof.
In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided:
the method for preparing the forged steel supporting roller comprises the steps of enabling the diameter of the forged steel supporting roller to be 1.2-1.4 m, enabling the surface hardness to be 82-88 HSD, enabling the surface hardness uniformity to be less than or equal to 1.5HSD, and enabling the quench hardening layer thickness to be more than or equal to 150mm; the preparation method comprises the following steps:
s1, smelting an ingot; the forged steel supporting roll cast ingot comprises 7.8-8.2wt% of Cr, 0.25-0.35wt% of Mo, 0.20-0.25wt% of Ni and 0.010-0.015 wt% of Nb;
s2, forging;
s3, performing heat treatment after forging;
placing the forged supporting roller in a heating furnace, heating to 890-960 ℃, preserving heat for 18-24 h, then cooling to 560-600 ℃, preserving heat for 96-144 h, then cooling to 180-200 ℃, and discharging and air-cooling;
s4, machining and flaw detection;
s5, final heat treatment;
and placing the qualified support roller in a heating furnace, heating to 980-1020 ℃, preserving heat for 12-24 h, discharging, quenching with oil for 6-12 h, placing in the heating furnace after quenching with oil, heating to 520-540 ℃, preserving heat for 30-42 h, discharging, and air cooling.
As a preferable scheme of the preparation method of the forged steel supporting roll, the invention comprises the following steps: the step S5 further includes:
s6, finish machining, flaw detection and packaging.
As a preferable scheme of the preparation method of the forged steel supporting roll, the invention comprises the following steps: in the step S1, a vacuum smelting process is adopted for smelting the cast ingot, and the smelting is carried out under the argon atmosphere.
As a preferable scheme of the preparation method of the forged steel supporting roll, the invention comprises the following steps: in the step S3, the post-forging heat treatment specifically includes: the forged supporting roller is placed in a heating furnace, the temperature is raised to 890-960 ℃ at a temperature rising speed of 20-40 ℃/h, the temperature is kept for 18-24 h, the temperature is lowered to 560-600 ℃ at a temperature lowering speed of 30-50 ℃/h, the temperature is kept for 96-144 h, the temperature is lowered to 180-200 ℃ at a temperature lowering speed of 10-15 ℃/h, and the furnace is discharged for air cooling.
As a preferable scheme of the preparation method of the forged steel supporting roll, the invention comprises the following steps: in the step S4, ultrasonic flaw detection is adopted for flaw detection, and the flaw detection is processed into rough machining.
As a preferable scheme of the preparation method of the forged steel supporting roll, the invention comprises the following steps: in the step S5, the final heat treatment specifically includes: the supporting roller qualified in flaw detection is placed in a heating furnace, the temperature is raised to 980-1020 ℃ at the temperature rising speed of 200-400 ℃/h, the temperature is kept for 12-24 h, then the supporting roller is discharged and oil quenched for 6-12 h, the supporting roller is placed in the heating furnace after the oil quenching, the temperature is raised to 520-540 ℃ at the temperature rising speed of 60-80 ℃/h, and the supporting roller is discharged and air cooled after the temperature is kept for 30-42 h.
As a preferable scheme of the preparation method of the forged steel supporting roll, the invention comprises the following steps: in the step S6, ultrasonic flaw detection is adopted.
In order to solve the above technical problems, according to another aspect of the present invention, the following technical solutions are provided:
the forged steel supporting roll is prepared by the preparation method of the forged steel supporting roll, and comprises the following chemical components in percentage by mass: c: 0.30-0.45 wt%, si: 0.85-1.05 wt%, mn: 0.20-0.45 wt%, P is less than or equal to 0.010wt%, S is less than or equal to 0.010wt%, cr: 7.8-8.2 wt%, mo:0.25 to 0.35wt% of Ni: 0.20-0.25 wt%, nb:0.010 to 0.015wt% and the balance of Fe and unavoidable impurities.
As a preferable embodiment of the forged steel support roller of the present invention, wherein: the chemical components of the material in percentage by mass are: c: 0.35-0.40 wt%, si: 0.90-1.00 wt%, mn: 0.25-0.40 wt%, P is less than or equal to 0.010wt%, S is less than or equal to 0.010wt%, cr: 7.9-8.0wt% of Mo:0.25 to 0.30wt% of Ni: 0.22-0.25 wt%, nb: 0.013-0.015 wt% and the balance of Fe and unavoidable impurities.
As a preferable embodiment of the forged steel support roller of the present invention, wherein: the diameter of the forged steel supporting roller is 1.2-1.4 m, the surface hardness is 82-88 HSD, the uniformity of the surface hardness is less than or equal to 1.5HSD, and the thickness of the quenching layer is more than or equal to 150mm.
The beneficial effects of the invention are as follows:
the invention provides a forged steel supporting roll and a preparation method thereof, wherein components of the forged steel supporting roll are adjusted, the forged supporting roll is placed in a heating furnace, the temperature is raised to 890-960 ℃, the heat is preserved for 18-24 hours, then the temperature is lowered to 560-600 ℃, the heat is preserved for 96-144 hours, and then the forged steel supporting roll is discharged from the furnace for air cooling after being cooled to 180-200 ℃; and placing the qualified support roller in a heating furnace, heating to 980-1020 ℃, preserving heat for 12-24 h, discharging, quenching with oil for 6-12 h, placing in the heating furnace after quenching with oil, heating to 520-540 ℃, preserving heat for 30-42 h, discharging, and air cooling. The surface hardness of the forged steel supporting roll with the diameter of 1.2-1.4 m is 82-88 HSD, the uniformity of the surface hardness is less than or equal to 1.5HSD, and the thickness of the quenching layer is more than or equal to 150mm.
Detailed Description
The following description will be made clearly and fully with reference to the technical solutions in the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to one aspect of the invention, the invention provides the following technical scheme:
the method for preparing the forged steel supporting roller comprises the steps of enabling the diameter of the forged steel supporting roller to be 1.2-1.4 m, enabling the surface hardness to be 82-88 HSD, enabling the surface hardness uniformity to be less than or equal to 1.5HSD, and enabling the quench hardening layer thickness to be more than or equal to 150mm; the preparation method comprises the following steps:
s1, smelting an ingot; the forged steel supporting roll cast ingot comprises 7.8-8.2wt% of Cr, 0.25-0.35wt% of Mo, 0.20-0.25wt% of Ni and 0.010-0.015 wt% of Nb;
s2, forging;
s3, performing heat treatment after forging;
placing the forged supporting roller in a heating furnace, heating to 890-960 ℃, preserving heat for 18-24 h, then cooling to 560-600 ℃, preserving heat for 96-144 h, then cooling to 180-200 ℃, and discharging and air-cooling;
s4, machining and flaw detection;
s5, final heat treatment;
and placing the qualified support roller in a heating furnace, heating to 980-1020 ℃, preserving heat for 12-24 h, discharging, quenching with oil for 6-12 h, placing in the heating furnace after quenching with oil, heating to 520-540 ℃, preserving heat for 30-42 h, discharging, and air cooling.
Preferably, the step S5 further includes:
s6, finish machining, flaw detection and packaging.
Preferably, in the step S1, the smelting ingot is performed under argon atmosphere by adopting a vacuum smelting process.
Preferably, in the step S3, the post-forging heat treatment specifically includes: placing the support roller after forging into a heating furnace, heating to 890-960 ℃ at a heating rate of 20-40 ℃/h, and preserving heat for 18-24 h (specifically, the heating rate can be, for example, but not limited to, any one or any two of 20 ℃/h, 25 ℃/h, 30 ℃/h, 35 ℃/h and 40 ℃/h, the preserving heat temperature can be, for example, but not limited to, any one or any two of 890 ℃, 900 ℃, 910 ℃, 920 ℃, 930 ℃, 940 ℃, 950 ℃ and 960 ℃, and the preserving heat time can be, for example, but not limited to, any one or any two of 18h, 19h, 20h, 21h, 22h, 23h and 24 h); then cooling to 560-600 ℃ at a cooling speed of 30-50 ℃/h for 96-144 h (specifically, the cooling speed can be, for example and without limitation, any one or any two of 30 ℃/h, 35 ℃/h, 40 ℃/h, 45 ℃/h and 50 ℃/h, the cooling temperature can be, for example and without limitation, any one or any two of 560 ℃, 570 ℃, 580 ℃, 590 ℃, 600 ℃, the cooling time can be, for example and without limitation, any one or any two of 96h, 102h, 108h, 114h, 120h, 126h, 132h, 138h and 144 h), and then cooling to 180-200 ℃ at a cooling speed of 10-15 ℃/h for tapping air cooling (specifically, the cooling speed can be, for example and without limitation, any one or any two of 10 ℃/h, 11 ℃/h, 12 ℃/h, 13 ℃/h, 14 ℃/h and 15 ℃/h, and the tapping temperature can be, for example and without limitation, 180 ℃, 185 ℃, 190 ℃, 200 ℃ or any two).
Preferably, in the step S4, the flaw detection is performed by ultrasonic flaw detection, and the machining is performed as rough machining.
Preferably, in the step S5, the final heat treatment is specifically: the qualified supporting roller is placed in a heating furnace, is heated to 980-1020 ℃ at a heating rate of 200-400 ℃/h and is insulated for 12-24 h and then is discharged for oil quenching for 6-12 h (specifically, the heating rate can be, for example, but not limited to, any one or any two of 200 ℃/h, 250 ℃/h, 300 ℃/h, 350 ℃/h and 400 ℃/h), the insulating temperature can be, for example, but not limited to 980 ℃, 990 ℃, 1000 ℃, 1010 ℃ and 1020 ℃ or any two ranges, the insulating time can be, for example, but not limited to, any one or any two of 12h, 15h, 18h, 21h and 24h, the oil quenching time can be, for example, but not limited to, any one or any two of 6h, 7h, 8h, 9h, 10h, 11h and 12 h), the oil quenching is then placed in the heating furnace, is heated to 520-42 ℃ at a heating rate of 60-80 ℃/h, and is discharged for example, but not limited to 520-540 ℃, the insulating time can be, and is cooled for example, but not limited to any one or any two of 60-80 ℃/h, 40 ℃ and is not limited to any one or any two of 35 ℃ and is cooled for example, 40 ℃ and is not limited to any one or two of 60 ℃ and 35 ℃ and 40 ℃ and is not limited to any one or any two of heat-35 ℃ and/or any two of heat insulating time, which can be heated for 6-35 ℃ and/or between any two of 3 ℃ and 35 ℃ and/or between any one of 3h and 40 ℃ and between 3 h.
Preferably, in the step S6, ultrasonic flaw detection is used for flaw detection.
According to one aspect of the invention, the invention provides the following technical scheme:
the forged steel supporting roll is prepared by the preparation method of the forged steel supporting roll, and comprises the following chemical components in percentage by mass: c: 0.30-0.45 wt%, si: 0.85-1.05 wt%, mn: 0.20-0.45 wt%, P is less than or equal to 0.010wt%, S is less than or equal to 0.010wt%, cr: 7.8-8.2 wt%, mo:0.25 to 0.35wt% of Ni: 0.20-0.25 wt%, nb:0.010 to 0.015wt% and the balance of Fe and unavoidable impurities.
Preferably, the forged steel supporting roll comprises the following chemical components in percentage by mass: c: 0.35-0.40 wt%, si: 0.90-1.00 wt%, mn: 0.25-0.40 wt%, P is less than or equal to 0.010wt%, S is less than or equal to 0.010wt%, cr: 7.9-8.0wt% of Mo:0.25 to 0.30wt% of Ni: 0.22-0.25 wt%, nb: 0.013-0.015 wt% and the balance of Fe and unavoidable impurities.
Preferably, the diameter of the forged steel supporting roll is 1.2-1.4 m, the surface hardness is 82-88 HSD, the uniformity of the surface hardness is less than or equal to 1.5HSD, and the thickness of the quenching hardness layer is more than or equal to 150mm.
The technical scheme of the invention is further described below by combining specific embodiments.
Example 1
The embodiment provides a forged steel supporting roll, which comprises the following chemical components in percentage by mass: c:0.38wt%, si:0.96wt%, mn:0.35wt%, P:0.008wt%, S:0.006wt%, cr:7.96wt%, mo:0.27wt%, ni:0.25wt%, nb:0.013wt% of Fe and unavoidable impurities in balance. The diameter of the forged steel supporting roll is 1.2m, and the preparation method comprises the following steps:
s1, smelting an ingot; smelting ingot casting adopts a vacuum smelting process and is carried out under argon atmosphere;
s2, forging;
s3, performing heat treatment after forging;
the forged supporting roller is placed in a heating furnace, is heated to 920 ℃ at a heating rate of 30 ℃/h, is insulated for 20h, is cooled to 570 ℃ at a cooling rate of 40 ℃/h, is insulated for 120h, is cooled to 180 ℃ at a cooling rate of 10 ℃/h, and is discharged for air cooling;
s4, performing ultrasonic flaw detection after rough machining;
s5, final heat treatment;
placing the qualified support roller in a heating furnace, heating to 1000 ℃ at a heating rate of 350 ℃/h, preserving heat for 18h, discharging, quenching with oil for 10h, placing in the heating furnace after quenching with oil, heating to 525 ℃ at a heating rate of 70 ℃/h, preserving heat for 36h, discharging, and air cooling;
s6, finish machining, ultrasonic flaw detection and packaging.
The forged steel supporting roller prepared in the embodiment is subjected to performance detection, the surface hardness is 87-88 HSD, the surface hardness uniformity is less than or equal to 1.0HSD, and the thinnest part of the hardening layer thickness is 157mm.
Example 2
The embodiment provides a forged steel supporting roll, which comprises the following chemical components in percentage by mass: c:0.45wt%, si:1.02wt%, mn:0.42wt%, P:0.007wt%, S:0.007wt%, cr:7.8wt%, mo:0.25wt%, ni:0.20wt%, nb:0.010 wt.%, balance of Fe and unavoidable impurities. The diameter of the forged steel supporting roll is 1.4m, and the preparation method comprises the following steps:
s1, smelting an ingot; smelting ingot casting adopts a vacuum smelting process and is carried out under argon atmosphere;
s2, forging;
s3, performing heat treatment after forging;
the forged supporting roller is placed in a heating furnace, is heated to 960 ℃ at a heating rate of 40 ℃/h and is insulated for 18h, is cooled to 560 ℃ at a cooling rate of 30 ℃/h and is insulated for 144h, is cooled to 200 ℃ at a cooling rate of 10 ℃/h, and is discharged for air cooling;
s4, performing ultrasonic flaw detection after rough machining;
s5, final heat treatment;
placing the qualified support roller in a heating furnace, heating to 1020 ℃ at a heating rate of 400 ℃/h, preserving heat for 15h, discharging, quenching with oil for 12h, placing in the heating furnace after quenching with oil, heating to 520 ℃ at a heating rate of 60 ℃/h, preserving heat for 30h, discharging, and air cooling;
s6, finish machining, ultrasonic flaw detection and packaging.
The forged steel supporting roller prepared in the embodiment is subjected to performance detection, the surface hardness is 85-86.5 HSD, the surface hardness uniformity is less than or equal to 1.5HSD, and the thinnest part of the quenching layer thickness is 153mm.
Example 3
The embodiment provides a forged steel supporting roll, which comprises the following chemical components in percentage by mass: c:0.43wt%, si:1.01wt%, mn:0.40wt%, P:0.006wt%, S:0.007wt%, cr:7.9wt%, mo:0.28wt%, ni:0.22wt%, nb:0.012 wt.%, balance Fe and unavoidable impurities. The diameter of the forged steel supporting roll is 1.3m, and the preparation method comprises the following steps:
s1, smelting an ingot; smelting ingot casting adopts a vacuum smelting process and is carried out under argon atmosphere;
s2, forging;
s3, performing heat treatment after forging;
the forged supporting roller is placed in a heating furnace, is heated to 890 ℃ at a heating rate of 20 ℃/h, is kept warm for 24 hours, is cooled to 600 ℃ at a cooling rate of 50 ℃/h, is kept warm for 96 hours, is cooled to 180 ℃ at a cooling rate of 15 ℃/h, and is discharged for air cooling;
s4, performing ultrasonic flaw detection after rough machining;
s5, final heat treatment;
placing the qualified support roller in a heating furnace, heating to 980 ℃ at a heating rate of 200 ℃/h, preserving heat for 24 hours, discharging, quenching with oil for 12 hours, placing the support roller in the heating furnace after quenching with oil, heating to 540 ℃ at a heating rate of 80 ℃/h, preserving heat for 30 hours, discharging, and air cooling;
s6, finish machining, ultrasonic flaw detection and packaging.
The forged steel supporting roller prepared in the embodiment is subjected to performance detection, the surface hardness is 85-86 HSD, the surface hardness uniformity is less than or equal to 1.0HSD, and the thinnest part of the hardening layer thickness is 154mm.
Comparative example 1
The difference from example 1 is that the forged steel support roll has a Cr mass percentage content of 5.2 wt.%.
The forged steel supporting roller prepared in the comparative example is subjected to performance detection, the surface hardness is 70-72 HSD, the surface hardness uniformity is less than or equal to 2.0HSD, and the thinnest part of the hardening layer thickness is 95mm.
Comparative example 2
The difference from example 1 is that the wrought steel support roll does not contain Nb.
The forged steel supporting roller prepared in the comparative example is subjected to performance detection, the surface hardness is 73-75 HSD, the uniformity of the surface hardness is less than or equal to 2.0HSD, and the thinnest part of the hardening layer thickness is 136mm.
Comparative example 3
The difference from example 1 is that in the step S3, the post-forging heat treatment is specifically: the support roller after forging is placed in a heating furnace, is heated to 850 ℃ at a heating rate of 30 ℃/h, is insulated for 20h, is cooled to 550 ℃ at a cooling rate of 40 ℃/h, is insulated for 120h, is cooled to 180 ℃ at a cooling rate of 10 ℃/h, and is discharged for air cooling.
The forged steel supporting roller prepared in the comparative example is subjected to performance detection, the surface hardness is 62-66 HSD, the surface hardness uniformity is less than or equal to 4.0HSD, and the thinnest part of the hardening layer thickness is 79mm.
Comparative example 4
The difference with the embodiment 1 is that the temperature is raised to 950 ℃ at the temperature rising speed of 350 ℃/h, the furnace is taken out for oil quenching for 10h after heat preservation for 18h, the furnace is placed in a heating furnace after oil quenching, the furnace is taken out for air cooling after the temperature is raised to 580 ℃ at the temperature rising speed of 70 ℃/h, and the furnace is taken out for heat preservation for 36 h.
The forged steel supporting roller prepared in the comparative example is subjected to performance detection, the surface hardness is 65-68 HSD, the surface hardness uniformity is less than or equal to 3.0HSD, and the thinnest part of the hardening layer thickness is 87mm.
Comparative example 5
The difference with the embodiment 1 is that the temperature is raised to 1000 ℃ at the heating rate of 500 ℃/h, the temperature is kept for 18h, then the steel is discharged from the furnace for oil quenching for 10h, the steel is placed in a heating furnace after oil quenching, the temperature is raised to 580 ℃ at the heating rate of 50 ℃/h, and then the steel is discharged from the furnace for air cooling after the temperature is kept for 36 h.
The forged steel supporting roller prepared in the comparative example is subjected to performance detection, the surface hardness is 74-76 HSD, the surface hardness uniformity is less than or equal to 2.0HSD, and the thinnest part of the hardening layer thickness is 139mm.
As can be seen from the examples and comparative examples of the present invention, by adjusting the composition of the forged steel support roller, the Cr element content is increased, a certain amount of Nb element is added, and no V element is added; the post-forging support roller is placed in a heating furnace in a matched mode of adjusting post-forging heat treatment and final heat treatment, is heated to 890-960 ℃ and kept for 18-24 h, is cooled to 560-600 ℃ and kept for 96-144 h, is cooled to 180-200 ℃ and is discharged from the furnace for air cooling; and placing the qualified support roller in a heating furnace, heating to 980-1020 ℃, preserving heat for 12-24 h, discharging, quenching with oil for 6-12 h, placing in the heating furnace after quenching with oil, heating to 520-540 ℃, preserving heat for 30-42 h, discharging, and air cooling. The surface hardness of the forged steel supporting roll with the diameter of 1.2-1.4 m is 82-88 HSD, the uniformity of the surface hardness is less than or equal to 1.5HSD, and the thickness of the quenching layer is more than or equal to 150mm.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the content of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. The preparation method of the forged steel supporting roller is characterized in that the diameter of the forged steel supporting roller is 1.2-1.4 m, the surface hardness is 82-88 HSD, the surface hardness uniformity is less than or equal to 1.5HSD, and the quench hardening layer thickness is more than or equal to 150mm; the preparation method comprises the following steps:
s1, smelting an ingot; the forged steel supporting roll cast ingot comprises the following chemical components in percentage by mass: c: 0.30-0.45 wt%, si: 0.85-1.05 wt%, mn: 0.20-0.45 wt%, P is less than or equal to 0.010wt%, S is less than or equal to 0.010wt%, cr: 7.8-8.2 wt%, mo:0.25 to 0.35wt% of Ni: 0.20-0.25 wt%, nb: 0.010-0.015 wt%, and the balance being Fe and unavoidable impurities;
s2, forging;
s3, performing heat treatment after forging;
placing the forged supporting roller in a heating furnace, heating to 890-960 ℃ at a heating rate of 20-40 ℃/h, preserving heat for 18-24 h, cooling to 560-600 ℃ at a cooling rate of 30-50 ℃/h, preserving heat for 96-144 h, cooling to 180-200 ℃ at a cooling rate of 10-15 ℃/h, and discharging for air cooling;
s4, machining and flaw detection;
s5, final heat treatment;
the supporting roller qualified in flaw detection is placed in a heating furnace, the temperature is raised to 980-1020 ℃ at the temperature rising speed of 200-400 ℃/h, the temperature is kept for 12-24 h, then the supporting roller is discharged and oil quenched for 6-12 h, the supporting roller is placed in the heating furnace after the oil quenching, the temperature is raised to 520-540 ℃ at the temperature rising speed of 60-80 ℃/h, and the supporting roller is discharged and air cooled after the temperature is kept for 30-42 h.
2. The method for manufacturing a forged steel support roll according to claim 1, wherein said step S5 further comprises:
s6, finish machining, flaw detection and packaging.
3. The method for manufacturing a forged steel supporting roll according to claim 1, wherein in the step S1, the ingot smelting is performed under argon atmosphere by using a vacuum smelting process.
4. The method for manufacturing a forged steel supporting roll according to claim 1, wherein in the step S4, the flaw detection is performed by ultrasonic flaw detection, and the forged steel supporting roll is processed into a rough work.
5. The method for manufacturing a forged steel supporting roll according to claim 2, wherein in the step S6, ultrasonic flaw detection is adopted.
6. A forged steel support roll, characterized in that it is manufactured by the method for manufacturing a forged steel support roll according to any one of claims 1-5.
7. The wrought steel support roller of claim 6, wherein the chemical composition, in mass percent, is: c: 0.35-0.40 wt%, si: 0.90-1.00 wt%, mn: 0.25-0.40 wt%, P is less than or equal to 0.010wt%, S is less than or equal to 0.010wt%, cr: 7.9-8.0wt% of Mo:0.25 to 0.30wt% of Ni: 0.22-0.25 wt%, nb: 0.013-0.015 wt% and the balance of Fe and unavoidable impurities.
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