CN111151732A - Preparation method of high-speed steel roller for finish rolling rear section of endless strip steel - Google Patents
Preparation method of high-speed steel roller for finish rolling rear section of endless strip steel Download PDFInfo
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- CN111151732A CN111151732A CN201911422730.XA CN201911422730A CN111151732A CN 111151732 A CN111151732 A CN 111151732A CN 201911422730 A CN201911422730 A CN 201911422730A CN 111151732 A CN111151732 A CN 111151732A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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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
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention discloses a preparation method of a high-speed steel roll for a finish rolling rear section of endless strip steel, which comprises the steps of adopting three-layer centrifugal composite casting, respectively casting an outer layer, an intermediate layer and a core part by adopting high-strength nodular cast iron, controlling the content of casting molten steel of the intermediate layer and the core part to be C1.8-2.8 wt%, Si 0.6-0.9 wt%, Mn 0.5-0.8 wt%, Ni 0.4-0.8 wt%, P less than or equal to 0.03wt%, S less than or equal to 0.03wt%, Cr + Mo + Nb + V + W17-22 wt%, and the balance being Fe and unavoidable impurities. The graphite obtained from the outer layer of the invention reduces the friction coefficient, and a certain amount of hard carbide enhances the wear resistance of the roller, the structure can effectively reduce the damage of the tail swing of the last frame to the roller, and simultaneously, the middle layer and the core part adopt the methods of wire feeding spheroidization and wire feeding inoculation (two lines, four lines in total are fed simultaneously), thus improving the spheroidization grade of the nodular cast iron, enhancing the tensile strength and greatly enhancing the accident resistance of the roller.
Description
Technical Field
The invention belongs to the field of steel casting, and particularly relates to a preparation method of a high-speed steel roller for a finish rolling rear section of endless strip steel rolling.
Background
Although the high-speed steel rolls are used on hot rolled strip steel at present, most of the high-speed steel rolls are used in the front section (F1-F3 or F1-F4) of finish rolling, a small quantity of the high-nickel-chromium infinite chilled rolls are used in rough rolling, the high-speed steel rolls are commonly used in the rear section of finish rolling at present, the use of a rear rack of the high-speed steel is almost blank, but with the continuous adjustment of the product structure of the steel industry, the requirements of rolled materials are continuously improved, for example, higher requirements on the wear resistance of the rolls and the maintenance of the roll shapes are provided when products such as high-performance silicon steel, automobile plates and the like are rolled, because the plate shape requirements of the products are very strict, and the traditional high-nickel-chromium infinite chilled rolls cannot meet the requirements on the rolling of special varieties.
Meanwhile, the ESP (engineering strip production) is called a headless strip steel production line, the ESP rolling line is the first and the only successful headless strip steel rolling production line in the world, and the first ESP rolling line in the world is put into industrial operation formally in the charmera factory of Arvedi s.p.a company, italy, 6 months in 2009, which means that a hot-rolled strip coil is directly produced from molten steel through thin slab continuous casting and rolling equipment by a continuous and uninterrupted production process; the total length of the production line is only 190m, continuous casting and rolling processes are directly connected in series, an ESP production line is the first full-continuous production line capable of realizing the process from molten steel to an underground coiler within 7 minutes, the cost is obviously reduced, an ESP rolling line is introduced at present in China and four or five rolling lines are continuously put into production, and certain steel mills in China are planning to newly invest similar rolling lines under the large background influences of current steel transformation upgrading, resource saving and the like.
However, the performance requirement of the working roll required by the ESP rolling line is very high, the single online time is long, the single steel passing amount of a general hot-rolled strip steel continuous rolling mill is about 50 kilometers, and the single steel passing amount of the ESP hot-rolled line is about 150 kilometers, sometimes even more, and is about three times of the single rolling kilometer number of a common roller; meanwhile, the thickness of an ESP rolled material is concentrated at about 0.8-1.1mm, the rolling difficulty is high, the requirement is high, the whole production line can be stopped if the ESP rolled material is stopped due to an accident in the rolling process, the roller is required to have super-strong wear resistance, roller shape retention capacity and strong accident resistance, and the use requirement of a rolling line can be met by continuously researching novel high-speed steel roller materials.
And due to the special rolling process conditions of the rolling rear section: the steel plate is low in temperature, an oxide film is difficult to form, the tail end is difficult to damage the roller surface, the influence of friction coefficient on rolling and the like, the success of the high-speed steel at the rear section is greatly influenced in the aspects of the low temperature, the high-speed steel made of special materials is required to be researched to overcome the key rolling processes, and meanwhile, the high wear resistance of the high-speed steel is required to improve the plate surface quality and the millimeter steel excess; because the online time is long, the requirement on the fatigue resistance of the roller bonding layer is high, and the tensile strength of a core part needs to be more than 400MPa, which are also important research contents.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a preparation method of a high-speed steel roller for a finish rolling rear section of endless strip steel rolling, aiming at the defects of the prior art.
The technical scheme is as follows: in order to achieve the above object, the present invention is specifically accomplished by: a method for preparing a high-speed steel roll for a finishing rolling rear section of endless strip steel comprises the steps of carrying out three-layer centrifugal composite casting, respectively casting an outer layer, a middle layer and a core part by using high-strength nodular cast iron, controlling the content of molten steel of the outer layer to be C1.8-2.8 wt%, Si 0.6-0.9 wt%, Mn 0.5-0.8 wt%, Ni 0.4-0.8 wt%, P less than or equal to 0.03wt%, S less than or equal to 0.03wt%, Cr + Mo + Nb + V + W17-22 wt%, and balancing Fe and unavoidable impurities. Wherein a certain amount of graphite is precipitated in the outer layer structure.
The middle layer and the core are cast in a wire feeding spheroidizing and wire feeding inoculation mode, and four cores are adopted for simultaneously carrying out double-wire feeding spheroidizing and double-wire feeding inoculation.
Wherein Cr forms M after the outer layer casting is finished7C3Type carbide, V, W, Nb form MC type carbide, Mo forms M2C-type carbide, wherein the total content of the carbide is 15-25%.
Wherein, the middle layer and the core part are all made of nodular cast iron, the casting ladle is adopted for casting, when the middle layer and the core part are cast, the casting ladle is transferred into a nodulizing station for nodulizing and inoculation, and the nodulizing and the inoculation are all fed together by a machine by adopting double lines.
When the three-layer centrifugal composite casting is carried out, the rotating speed of a centrifugal machine is set to be 28m/s according to the linear speed, the interface temperature is set according to the liquidus temperature of the outer layer and the fixed temperature of 120 ℃, the high-speed steel material of the outer layer is cast firstly, the middle layer is cast after the crystallization and the interface temperature are reached, the casting of the middle layer is carried out for 2-3 minutes, the centrifugal machine is shut down to automatically reduce the speed, and the nodular cast iron of the core part is cast.
The method comprises the specific process steps of process design, head and neck modeling, cold mold preheating, coating, assembly, heating and heat preservation, adjustment into a centrifuge, outer layer material smelting, intermediate layer and core part material smelting, outer layer centrifugal casting, intermediate layer and core part casting (hanging out for wire feeding spheroidization and wire feeding inoculation before casting), cooling, unpacking, annealing, surface machining, detection, heat treatment, detection, turning, grinding, detection, finished product packaging and delivery for use. Compared with the prior art, the whole process route has the improvement points of material smelting of the middle layer and the core part and casting pretreatment of the middle layer and the core part, and the outgoing material smelting and casting are the same as those of the prior art.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the graphite obtained in the outer layer reduces the friction coefficient, a certain amount of hard carbide enhances the wear resistance of the roller, and the structure can effectively reduce the damage of the tail flicking of the final frame to the roller;
2. the four cores are adopted for feeding and spheroidizing simultaneously, the graphite spheroidizing grade of the middle layer and the core part is high, the structure is fine, the tensile strength of the nodular cast iron is greatly improved, the accident resistance of the roller is enhanced, and the roller breakage is prevented; wherein, wire feeding spheroidization and wire feeding inoculation are as follows: the nodulizer and the inoculant with specific components are respectively arranged in the cored wire, the cored wire (the wire contains the nodulizer and the inoculant) is fed into the molten steel at a constant speed by a wire feeding machine, and the molten steel is nodulized and inoculated to replace the original traditional punching method;
3. compared with the traditional centrifuge, the rotating speed of the specific centrifuge is set, the rotating speed is obviously improved, the structure is more compact, the upper and lower thickness fall is reduced, and the interface temperature and the pouring temperature are reset, so that the working layer, the intermediate layer and the core are effectively metallurgically bonded.
Drawings
FIG. 1 is a schematic diagram of the structure of the outer layer steel of the present invention under a 10-fold microscope;
FIG. 2 is a schematic diagram of the structure of the outer layer steel of the present invention under a microscope of 100 times;
FIG. 3 is a schematic diagram of the structure of the outer layer steel of the present invention under a microscope of 500 times;
FIG. 4 is a schematic diagram of the structure of the nodular cast iron in the middle layer of the invention under a microscope of 100 times;
FIG. 5 is a schematic view of the core nodular cast iron structure of the present invention under a microscope of 100 times.
Detailed Description
Example 1:
the method comprises the steps of adopting three-layer centrifugal composite casting, respectively casting high-speed steel on an outer layer, and casting high-strength nodular cast iron on an intermediate layer and a core, wherein the content of cast molten iron on the outer layer is controlled to be C1.8wt%, Si0.6wt%, Mn0.5wt%, Ni0.4wt%, P is less than or equal to 0.03wt%, S is less than or equal to 0.03wt%, the additive content of five elements of Cr + Mo + Nb + V + W is 17wt%, and the balance is Fe and unavoidable impurities. The middle layer and the core are cast in a wire feeding spheroidization and wire feeding inoculation mode, and four cores are adopted for simultaneously carrying out double-wire feeding spheroidization and double-wire feeding inoculation; the middle layer and the core part are all made of nodular cast iron and are cast by adopting a casting ladle, when the outer layer is cast, the middle layer and the core part casting ladle are simultaneously transferred into a spheroidizing station for spheroidizing and inoculation, and the spheroidizing and the inoculation are simultaneously fed by a machine by adopting double lines; during the three-layer centrifugal composite casting, the rotating speed of a centrifugal machine is set to be 28m/s according to the linear speed, the interface temperature is set according to the liquidus temperature of the outer layer and the fixed temperature of 120 ℃, the outer-layer high-speed steel material is cast firstly, the middle layer is cast after the outer-layer high-speed steel material is crystallized and the interface temperature is reached, the casting of the middle layer is waited for 2-3 minutes, and the centrifugal machine is shut down to automatically reduce the speed and cast the core nodular cast.
Example 2:
the step is the same as that of the embodiment 1, the cast iron content of the outer layer is controlled to be C2.8wt%, Si0.9wt%, Mn0.8wt%, Ni0.8wt%, P is less than or equal to 0.03wt%, S is less than or equal to 0.03wt%, the additive content of five elements of Cr + Mo + Nb + V + W is 22wt%, and the balance is Fe and unavoidable impurities.
Example 3:
the step is the same as the example 1, the content of the cast molten iron on the outer layer is controlled to be C2.3wt%, Si0.7wt%, Mn0.6wt%, Ni0.5wt%, P is less than or equal to 0.03wt%, S is less than or equal to 0.03wt%, the additive content of five elements of Cr + Mo + Nb + V + W is 20wt%, and the balance is Fe and unavoidable impurities.
Example 4:
the step is the same as the example 1, the content of cast iron liquid on the outer layer is controlled to be C2.1wt%, Si0.8wt%, Mn0.7wt%, Ni0.6wt%, P is less than or equal to 0.03wt%, S is less than or equal to 0.03wt%, the additive content of five elements of Cr + Mo + Nb + V + W is 18wt%, and the balance is Fe and unavoidable impurities.
Example 5:
the step is the same as the example 1, the content of the cast molten iron in the outer layer is controlled to be C2.6wt%, Si0.7wt%, Mn0.8wt%, Ni0.7wt%, P is less than or equal to 0.03wt%, S is less than or equal to 0.03wt%, the additive content of five elements of Cr + Mo + Nb + V + W is 21wt%, and the balance is Fe and unavoidable impurities.
Claims (5)
1. A preparation method of a high-speed steel roll for a finishing rolling rear section of endless strip steel is characterized by adopting three-layer centrifugal composite casting, respectively casting an outer layer, a middle layer and a core by adopting high-strength nodular cast iron, controlling the molten steel content of the outer layer casting to be C1.8-2.8 wt%, Si 0.6-0.9 wt%, Mn 0.5-0.8 wt%, Ni 0.4-0.8 wt%, P less than or equal to 0.03wt%, S less than or equal to 0.03wt%, Cr + Mo + Nb + V + W17-22 wt%, and balancing Fe and inevitable impurities.
2. The method for manufacturing a high-speed steel roll for a post-finishing stage of bandeau steel rolling according to claim 1, wherein the intermediate layer and the core are cast by wire feeding spheroidization and wire feeding inoculation, and four cores are used for simultaneously performing double-wire feeding spheroidization and double-wire feeding inoculation.
3. The method for manufacturing a high-speed steel roll for a post-finishing rolling stage of headband steel according to claim 1, wherein Cr forms M after the completion of the outer layer casting7C3Type carbide, V, W, Nb form MC type carbide, Mo forms M2And C-type carbide, wherein the total mass of the carbide accounts for 15-25% of the mass of the whole roller.
4. The method for producing a high-speed steel roll for a post-finishing rolling stage of bandeau steel according to claim 3, wherein said intermediate layer and said core are both nodular cast iron, and casting is performed using a ladle, and wherein said ladle is transferred to a spheroidizing station for spheroidizing and inoculating while said intermediate layer and said core are cast, and wherein said spheroidizing and inoculating are both simultaneously fed together by a machine in two lines.
5. The method for preparing the high-speed steel roll for the post-rolling finish rolling section of the headband steel according to claim 1, wherein during the three-layer centrifugal composite casting, the rotating speed of a centrifugal machine is set to be 28m/s according to the linear speed, the interface temperature is set according to the liquidus temperature of the outer layer and the fixed temperature of 120 ℃, the material of the outer-layer high-speed steel is cast firstly, the middle layer is cast after the crystallization and the interface temperature are reached, the casting of the middle layer is waited for 2-3 minutes, and the centrifugal machine is shut down to automatically reduce the speed and cast the nodular cast iron into the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422730.XA CN111151732A (en) | 2019-12-31 | 2019-12-31 | Preparation method of high-speed steel roller for finish rolling rear section of endless strip steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911422730.XA CN111151732A (en) | 2019-12-31 | 2019-12-31 | Preparation method of high-speed steel roller for finish rolling rear section of endless strip steel |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59129720A (en) * | 1983-01-17 | 1984-07-26 | Kubota Ltd | Production of high hardness high chromium roll |
| CN1153539A (en) * | 1995-03-07 | 1997-07-02 | 川崎制铁株式会社 | Cladding material for centrifugal casting roll |
| CN1197415A (en) * | 1996-06-18 | 1998-10-28 | 川崎制铁株式会社 | Hot rolling roll excellent in abrasion resistance and reduced in segregation of carbide |
| CN1737179A (en) * | 2005-09-09 | 2006-02-22 | 包头文鑫实业有限公司 | Method for producing spheroidal graphite cast iron or vermicular cast iron adopting multiple core-spun yarn disposing in iron water |
| CN1858265A (en) * | 2006-05-01 | 2006-11-08 | 张清臣 | Two-thread vertical thread feeding method and its device |
| CN1861827A (en) * | 2006-05-28 | 2006-11-15 | 江苏共昌轧辊有限公司 | Half high speed steel composite roller and preparation process thereof |
| JP2007144441A (en) * | 2005-11-25 | 2007-06-14 | Hitachi Metals Ltd | Composite roll for rolling |
| CN101240403A (en) * | 2008-01-30 | 2008-08-13 | 中国科学院金属研究所 | High-speed steel composite roller and casting method thereof |
| CN104308112A (en) * | 2014-09-24 | 2015-01-28 | 江苏共昌轧辊股份有限公司 | Preparation method of reinforced D2 steel centrifugal composite rod wire finishing roll |
| CN104353798A (en) * | 2014-10-16 | 2015-02-18 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method for high-speed steel working roll at hot continuous rolling finish rolling rear section |
| CN105274425A (en) * | 2015-10-28 | 2016-01-27 | 中钢集团邢台机械轧辊有限公司 | High-alloy roller for front stage of hot continuous finish rolling and preparation method thereof |
| CN105750529A (en) * | 2016-04-01 | 2016-07-13 | 枣庄瑞兴机械制造有限公司 | High-tungsten high-abrasion-resistant high-speed steel composite roller and preparation method thereof |
-
2019
- 2019-12-31 CN CN201911422730.XA patent/CN111151732A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59129720A (en) * | 1983-01-17 | 1984-07-26 | Kubota Ltd | Production of high hardness high chromium roll |
| CN1153539A (en) * | 1995-03-07 | 1997-07-02 | 川崎制铁株式会社 | Cladding material for centrifugal casting roll |
| CN1197415A (en) * | 1996-06-18 | 1998-10-28 | 川崎制铁株式会社 | Hot rolling roll excellent in abrasion resistance and reduced in segregation of carbide |
| CN1737179A (en) * | 2005-09-09 | 2006-02-22 | 包头文鑫实业有限公司 | Method for producing spheroidal graphite cast iron or vermicular cast iron adopting multiple core-spun yarn disposing in iron water |
| JP2007144441A (en) * | 2005-11-25 | 2007-06-14 | Hitachi Metals Ltd | Composite roll for rolling |
| CN1858265A (en) * | 2006-05-01 | 2006-11-08 | 张清臣 | Two-thread vertical thread feeding method and its device |
| CN1861827A (en) * | 2006-05-28 | 2006-11-15 | 江苏共昌轧辊有限公司 | Half high speed steel composite roller and preparation process thereof |
| CN101240403A (en) * | 2008-01-30 | 2008-08-13 | 中国科学院金属研究所 | High-speed steel composite roller and casting method thereof |
| CN104308112A (en) * | 2014-09-24 | 2015-01-28 | 江苏共昌轧辊股份有限公司 | Preparation method of reinforced D2 steel centrifugal composite rod wire finishing roll |
| CN104353798A (en) * | 2014-10-16 | 2015-02-18 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method for high-speed steel working roll at hot continuous rolling finish rolling rear section |
| CN105274425A (en) * | 2015-10-28 | 2016-01-27 | 中钢集团邢台机械轧辊有限公司 | High-alloy roller for front stage of hot continuous finish rolling and preparation method thereof |
| CN105750529A (en) * | 2016-04-01 | 2016-07-13 | 枣庄瑞兴机械制造有限公司 | High-tungsten high-abrasion-resistant high-speed steel composite roller and preparation method thereof |
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Application publication date: 20200515 |