CN112813339B - Preparation method of ductile iron vertical roll for tropical vertical rolling mill - Google Patents
Preparation method of ductile iron vertical roll for tropical vertical rolling mill Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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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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Abstract
The invention relates to a preparation method of a ductile iron vertical roll for a tropical vertical rolling mill, which belongs to the technical field of roll materials and comprises the following steps: A. smelting molten iron by using scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials in an electric arc furnace at the smelting temperature of 1400 ℃ and 1600 ℃, and discharging from the furnace after melting to obtain a foundry ladle; B. b, adding a nodulizer into the foundry ladle obtained in the step A, pouring to obtain a ball iron vertical roll blank for the hot-strip vertical roll mill, and opening the box in a cold condition for 120-160 hours; C. and D, treating the ball iron vertical roll blank for the tropical vertical roll mill prepared in the step B in an integral heating heat treatment mode. The ductile iron vertical roll for the tropical vertical rolling mill has good wear resistance, cold and hot fatigue performance, good heat conduction and lubrication performance and good toughness, is well suitable for good high-temperature thermal shock, thermal crack resistance, adhesion resistance and relatively good wear resistance required by the contact of the tropical vertical roll and a high-temperature billet, and meets the requirement of rolling the edge of hot-rolled strip steel.
Description
Technical Field
The invention relates to a preparation method of a ductile iron vertical roll for a tropical vertical rolling mill, belonging to the technical field of roll materials.
Background
The existing tropical vertical roll frame uses alloy steel, semisteel and forged steel vertical rolls, and in the actual use process, the heat conduction and lubrication performance are poor, so that the hot rolling machine is suitable for poor high-temperature thermal shock, thermal crack resistance, adhesion resistance and relatively good wear resistance required by the vertical rolls contacting high-temperature steel billets, and is short in service life and high in production cost.
The ductile iron vertical roll prepared by the invention has the advantages that a certain amount of graphite is distributed in the matrix, the ductile iron vertical roll has good heat conduction and lubrication performance and good toughness, the material components are reasonable in proportion, and the ductile iron vertical roll prepared after the preparation process is adjusted can better adapt to good high-temperature thermal shock, thermal crack resistance, adhesion resistance and relatively good wear resistance required by a hot-strip vertical roll contacting a high-temperature billet, and meets the requirement of rolling the edge of a hot-rolled strip steel.
Disclosure of Invention
The invention aims to provide a method for preparing a hot-band vertical roller mill ductile iron vertical roller, which is used for preparing a hot-band vertical roller mill ductile iron vertical roller with heat crack resistance and high wear resistance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a ductile iron vertical roll for a tropical vertical rolling mill comprises the following steps:
A. smelting molten iron by using scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials in an electric arc furnace at the smelting temperature of 1400-1600 ℃, and discharging the molten iron after melting to obtain a foundry ladle;
B. adding a nodulizer into the foundry ladle obtained in the step A, pouring to obtain a nodular iron vertical roll blank for the tropical vertical roll mill, and opening the box in a cold condition for 160h in the temperature range of 120-;
C. and D, treating the ball iron vertical roll blank for the hot-strip vertical roll mill prepared in the step B in an integral heating heat treatment mode.
The technical scheme of the invention is further improved as follows: and B, the nodulizer in the step B is a rare earth magnesium nodulizer, and the addition amount of the rare earth magnesium nodulizer is 0.8-1.5% of the weight of the molten iron.
The technical scheme of the invention is further improved as follows: the weight percentage of each component of the molten iron after the nodulizer is added in the step B is respectively as follows: c: 3.0-3.8%, Si: 1.0-3.0%, Mn: 0.4-1.2%, P is less than or equal to 0.10%, S is less than or equal to 0.08%, Cr: 0.2-1.0%, Ni: 1.5-3.5%, Mo: 0.2-1.0 percent, and the balance being Fe.
The technical scheme of the invention is further improved as follows: the main component of the electrode powder in the step A is a graphitizing carburant.
The technical scheme of the invention is further improved as follows: the overall heating heat treatment mode of the step C is as follows: preheating at 480 ℃ of 400-; finally, tempering is carried out at the temperature of 500 ℃ and 600 ℃ for 30-60 h.
The technical scheme of the invention is further improved as follows: the spray cooling adopts water as a medium.
Due to the adoption of the technical scheme, the invention has the following technical effects:
the ductile iron vertical roll for the tropical vertical rolling mill has good wear resistance and cold-hot fatigue performance, has good heat conduction and lubrication performance and good toughness in the actual use process, is well suitable for good high-temperature thermal shock and thermal crack resistance, adhesion resistance and relatively good wear resistance required by the tropical vertical roll contacting high-temperature steel billets, and meets the requirement of rolling the edge of hot-rolled strip steel.
According to the invention, the high wear resistance of the ductile iron vertical roll is ensured and the ductile iron vertical roll has good heat cracking resistance and adhesion resistance through the determination of the proportion of each alloy material component and the process operation.
Drawings
FIG. 1 is a metallographic picture of the product of example 1 of the invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation method of a ductile iron vertical roll for a tropical vertical rolling mill comprises the following steps:
A. the method comprises the steps of taking scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials, wherein the main component of the electrode powder is a graphitized carburant, smelting molten iron by adopting an electric arc furnace at the smelting temperature of 1400-1600 ℃, and discharging from the furnace after melting is finished to obtain a foundry ladle.
B. And B, adding a rare earth magnesium nodulizer which accounts for 0.8-1.5% of the weight of the molten iron into the ladle obtained in the step A, wherein the molten iron comprises the following components in percentage by weight: c: 3.0-3.8%, Si: 1.0-3.0%, Mn: 0.4-1.2%, P is less than or equal to 0.10%, S is less than or equal to 0.08%, Cr: 0.2-1.0%, Ni: 1.5-3.5%, Mo: 0.2 to 1.0 percent of Fe and the balance of Fe, and casting to obtain the ball iron vertical roll blank for the tropical vertical roll mill.
C. And D, treating the ball iron vertical roll blank for the tropical vertical roll mill prepared in the step B in an integral heating heat treatment mode, wherein the integral heating heat treatment mode is as follows: preheating at 480 ℃ of 400-; finally, the whole tempering is carried out at the temperature of 500 ℃ and 600 ℃ for 30-60 h.
Example 1
The method comprises the following steps of taking scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials, smelting at the temperature of 1400 ℃ by adopting an electric arc furnace, discharging after melting down to obtain a foundry ladle, adding 1.0% of a rare earth magnesium nodulizer, wherein the molten iron comprises the following components in percentage by weight: c: 3.0%, Si: 1.0%, Mn: 0.4%, P: 0.05%, S: 0.05%, Cr: 0.20%, Ni: 1.5%, Mo: 0.20 percent and the balance of Fe. Casting to obtain a ball iron vertical roll blank for the tropical vertical roll mill, then performing cold unpacking for 120h, performing heat treatment on the ball iron vertical roll blank for the tropical vertical roll mill in an integral heating mode, preheating for 25h at 400 ℃, then heating for 350min at 850 ℃, performing spray cooling on a roll body, and performing air cooling on a roll neck; and (4) loading and tempering for 30 hours at 400 ℃.
Example 2
Scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder are used as raw materials, an electric arc furnace is adopted for smelting at the temperature of 1430 ℃, the temperature is raised to 1540 ℃ after the smelting is finished, the raw materials are taken out of the furnace to obtain a foundry ladle, 1.2 percent of rare earth magnesium nodulizer is added, and the molten iron comprises the following components in percentage by weight: c: 3.1%, Si: 2.2%, Mn: 0.5%, P: 0.06%, S: 0.06%, Cr: 0.3%, Ni: 1.8%, Mo: 0.3 percent and the balance of Fe. Pouring to obtain a ball iron vertical roll blank for the tropical vertical roll mill, then opening the box in a cold mode for 130h, carrying out heat treatment on the ball iron vertical roll blank for the tropical vertical roll mill in an integral heating mode, preheating for 24h at 450 ℃, heating for 320min at 870 ℃, carrying out spray cooling on a roll body, and carrying out air cooling on a roll neck; and (4) loading and tempering for 38 hours at 420 ℃.
Example 3
The method comprises the following steps of taking scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials, smelting at 1450 ℃ by adopting an electric arc furnace, heating to 1550 ℃ after melting down, discharging to obtain a foundry ladle, adding 1.5% of rare earth magnesium nodulizer, wherein the molten iron comprises the following components in percentage by weight: c: 3.2%, Si: 1.3%, Mn: 0.6%, P: 0.05%, S: 0.05%, Cr: 0.4%, Ni: 2.0%, Mo: 0.5 percent and the balance of Fe. Pouring to obtain a ball iron vertical roll blank for the tropical vertical roll mill, then opening the box in a cold mode for 140h, carrying out heat treatment on the ball iron vertical roll blank for the tropical vertical roll mill in an integral heating mode, preheating for 23h at 480 ℃, heating for 330min at 900 ℃, carrying out spray cooling on a roll body, and carrying out air cooling on a roll neck; and (4) furnace loading and tempering for 40 hours at 440 ℃.
Example 4
Scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder are used as raw materials, an electric arc furnace is adopted for smelting at the temperature of 1480 ℃, the temperature is raised to 1580 ℃ after melting down, a foundry ladle is obtained after discharging, 0.8% of rare earth magnesium nodulizer is added, and the molten iron comprises the following components in percentage by weight: c: 3.3%, Si: 2.0%, Mn: 1.0%, P: 0.06%, S: 0.05%, Cr: 0.50%, Ni: 2.5%, Mo: 0.6 percent and the balance of Fe. Casting to obtain a ball iron vertical roll blank for the tropical vertical roll mill, then cooling for 150h, opening a box, performing heat treatment on the ball iron vertical roll blank for the tropical vertical roll mill in an integral heating mode, preheating for 22h at 480 ℃, then heating for 350min at 900 ℃, performing spray cooling on a roll body, and performing air cooling on a roll neck; and (4) furnace loading and tempering for 45 hours at 450 ℃.
Example 5
The method comprises the following steps of taking scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials, smelting at 1500 ℃ by adopting an electric arc furnace, heating to 1600 ℃ after melting down, discharging to obtain a foundry ladle, adding 5.5% of rare earth magnesium nodulizer, wherein the molten iron comprises the following components in percentage by weight: 3.5 percent of C, 1.6 percent of Si, 0.8 percent of Mn0.05 percent of P, 0.05 percent of S, 0.7 percent of Cr0.7 percent, 3.0 percent of Ni0.7 percent of Mo0.7 percent and the balance of Fe. Casting to obtain a ball iron vertical roll blank for the tropical vertical roll mill, then performing cold unpacking for 160h, performing heat treatment on the ball iron vertical roll blank for the tropical vertical roll mill in an integral heating mode, preheating for 24h at 480, heating for 360min at 900 ℃, performing spray cooling on a roll body, and performing air cooling on a roll neck; and (4) loading and tempering for 46h at 460 ℃.
Example 6
The method comprises the following steps of taking scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials, smelting at 1500 ℃ by adopting an electric arc furnace, heating to 1600 ℃ after melting down, discharging to obtain a foundry ladle, adding 1.5% of a rare earth magnesium nodulizer, wherein the molten iron comprises the following components in percentage by weight: c: 3.8%, Si: 3.0%, Mn: 1.2%, P: 0.10%, S: 0.08%, Cr: 1.0%, Ni: 3.5%, Mo: 1.0 percent and the balance of Fe. Casting to obtain a ball iron vertical roll blank for the tropical vertical roll mill, then performing cold unpacking for 160h, performing heat treatment on the ball iron vertical roll blank for the tropical vertical roll mill in an integral heating mode, preheating for 24h at 480, heating for 360min at 900 ℃, performing spray cooling on a roll body, and performing air cooling on a roll neck; and (3) loading and tempering for 50h at 460 ℃.
Comparative example 1
Comparative example 1 is a semi-steel roll.
Comparative example 2
The method comprises the following steps of taking scrap steel, ferronickel, ferrovanadium and ferromolybdenum as raw materials, smelting at the temperature of 1400 ℃ by adopting an electric arc furnace, discharging after melting down to obtain a ladle, adding 1.0% of a rare earth magnesium nodulizer, wherein the molten iron comprises the following components in percentage by weight: c: 3.0%, Si: 1.0%, Mn: 0.4%, P: 0.05%, S: 0.05%, Cr: 0.20%, Ni: 1.5%, Mo: 0.20 percent and the balance of Fe. And (3) casting to obtain a ball iron vertical roll blank for the tropical vertical roll mill, then performing cold unpacking for 120h, performing heat treatment on the ball iron vertical roll blank for the tropical vertical roll mill in an integral heating mode, preheating for 25h at 400 ℃, then heating for 350min at 850 ℃, performing spray cooling on a roll body, performing air cooling on a roll neck, and performing furnace loading and tempering for 30h at 400 ℃.
The products of examples 1-6 and comparative examples 1-2 were subjected to tensile mechanical property testing, the performance testing was carried out according to the national standard GB/T228, and the test results are shown in Table 1.
Table 1 EXAMPLES Performance test results
Through carrying out relative wear resistance and cold-hot fatigue performance tests on the vertical rolls of the examples 1-6 and the comparative examples 1-2, the wear resistance of the ductile iron vertical roll prepared by the invention is superior to that of a semi-steel roll, and simultaneously, is also superior to that of the semi-steel roll; the wear resistance and the cold-hot fatigue performance of the ductile iron vertical roller prepared by not adding the electrode powder into the prepared material are slightly poor.
Compared with a semi-steel roller, the ductile iron vertical roller for the tropical vertical roller mill prepared by the invention has better wear resistance and better cold and hot fatigue performance. FIG. 1 is a diagram showing the gold phase of the product of example 1, which is rounded and has good morphology, and it can be inferred that the product has good thermal conductivity; in the actual use process, the hot-rolled strip steel has good heat conduction and lubrication performance and good toughness, is well suitable for good high-temperature thermal shock, thermal cracking resistance, adhesion resistance and relatively good wear resistance required by the hot-strip vertical roller contacting high-temperature steel billets, and meets the requirement of edge rolling of hot-rolled strip steel.
Claims (4)
1. A preparation method of a ductile iron vertical roll for a tropical vertical rolling mill is characterized by comprising the following steps: the method comprises the following steps:
A. smelting molten iron by using scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials in an electric arc furnace at the smelting temperature of 1400-1600 ℃, and discharging the molten iron after melting to obtain a foundry ladle; B. adding a nodulizer into the foundry ladle obtained in the step A, pouring to obtain a nodular iron vertical roll blank for the tropical vertical roll mill, and opening the box in a cold condition for 160h in the temperature range of 120-; the molten iron after the nodulizer is added comprises the following components in percentage by weight: c: 3.0-3.8%, Si: 1.0-3.0%, Mn: 0.5-1.2%, P is less than or equal to 0.10%, S is less than or equal to 0.08%, Cr: 0.4-1.0%, Ni: 1.5-3.5%, Mo: 0.2-1.0% and the balance of Fe;
C. b, treating the ball iron vertical roll blank for the tropical vertical roll mill prepared in the step B in an integral heating heat treatment mode; the integral heating heat treatment mode is as follows: preheating at 480 ℃ of 400-; finally, tempering is carried out at the temperature of 500 ℃ and 600 ℃ for 30-60 h.
2. The method for preparing the ductile iron vertical roll for the tropical vertical rolling mill according to claim 1, wherein the method comprises the following steps: and in the step B, the nodulizer is a rare earth magnesium nodulizer, and the addition amount of the nodulizer is 0.8-1.5% of the weight of the molten iron.
3. The method for preparing the ductile iron vertical roll for the tropical vertical rolling mill according to claim 1, wherein the method comprises the following steps: the main component of the electrode powder in the step A is a graphitizing carburant.
4. The method for preparing the ductile iron vertical roll for the tropical vertical rolling mill according to claim 1, characterized by comprising the following steps: the spray cooling adopts water as a medium.
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| CN113523201A (en) * | 2021-06-15 | 2021-10-22 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-wear-resistance nodular cast iron roller for hot continuous rolling and steckel mill |
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