CN111020362B - Nodular cast iron edging roll suitable for universal mill and manufacturing method thereof - Google Patents
Nodular cast iron edging roll suitable for universal mill and manufacturing method thereof Download PDFInfo
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- CN111020362B CN111020362B CN201911425332.3A CN201911425332A CN111020362B CN 111020362 B CN111020362 B CN 111020362B CN 201911425332 A CN201911425332 A CN 201911425332A CN 111020362 B CN111020362 B CN 111020362B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
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- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D5/00—Heat treatments of cast-iron
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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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
-
- 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
Abstract
The invention discloses a nodular cast iron edging roll suitable for a universal mill, which comprises the following elements in percentage by mass: 3.2 to 3.6 percent of carbon, 1.8 to 2.4 percent of silicon, 0.5 to 1.2 percent of manganese, 0.08 to 0.12 percent of magnesium, 0.2 to 0.6 percent of copper, 0.2 to 0.4 percent of nickel, 0.03 to 0.04 percent of cerium, 0.08 to 0.1 percent of yttrium, 0.01 to 0.02 percent of molybdenum, 0.04 to 0.1 percent of chromium, 0.004 to 0.006 percent of titanium, 0.02 to 0.03 percent of vanadium, less than or equal to 0.05 percent of phosphorus, less than or equal to 0.025 percent of sulfur, and the balance of iron. The invention also provides a manufacturing method of the nodular cast iron edging roll suitable for the universal mill. The edge rolling roller can be strongly extruded under a high-temperature state for a long time without cracking, has excellent wear resistance, extrusion toughness and thermal fatigue resistance, improves the on-machine operation time, and better prolongs the service life of the edge rolling roller.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a nodular cast iron edging roll suitable for a universal mill, and also relates to a manufacturing method of the nodular cast iron edging roll suitable for the universal mill.
Background
The universal rolling mill is a main frame composed of a pair of horizontal rolls and a pair of vertical rolls, the axes of the four rolls are in a plane, the horizontal rolls are driving rolls, the vertical rolls are driven rolls (some vertical rolls of the rolling mill can also be driven), four sides of a rolled piece can be machined, and the two-roll horizontal rolling mill is used as an auxiliary frame (edger).
Universal rolling mills are mainly used for rolling various types of sections, such as: various types of section steel such as H-shaped steel, steel rails, I-shaped steel, channel steel, steel sheet piles, U-shaped steel, L-shaped steel, inequilateral angle steel and the like are named as 'universal rolling mills' because the section steel is suitable for rolling various types of steel.
The edge roller is an important part of a universal mill, and the conventional nodular cast iron edge roller is easy to generate fatigue cracks due to unreasonable formula and process, is easy to damage the matrix structure of the edge roller under the action of heat, torsional pressure and stress, has high factors for generating the thermal fatigue cracks, and influences the service life of the edge roller.
Disclosure of Invention
The invention aims to provide a nodular cast iron edging roll suitable for a universal mill, which can be strongly extruded under a high-temperature state for a long time without cracking, has excellent wear resistance, extrusion toughness and thermal fatigue resistance, improves the on-machine operation time, and better prolongs the service life of the edging roll.
In order to achieve the purpose, the invention provides the following technical scheme:
the nodular cast iron edging roll suitable for the universal mill comprises the following element components in percentage by weight:
3.2 to 3.6 percent of carbon, 1.8 to 2.4 percent of silicon, 0.5 to 1.2 percent of manganese, 0.08 to 0.12 percent of magnesium, 0.2 to 0.6 percent of copper, 0.2 to 0.4 percent of nickel, 0.03 to 0.04 percent of cerium, 0.08 to 0.1 percent of yttrium, 0.01 to 0.02 percent of molybdenum, 0.04 to 0.1 percent of chromium, 0.004 to 0.006 percent of titanium, 0.02 to 0.03 percent of vanadium, less than or equal to 0.05 percent of phosphorus, less than or equal to 0.025 percent of sulfur, and the balance of iron.
Preferably, the ductile iron edging roll suitable for the universal mill comprises the following element components in percentage by weight:
3.2% of carbon, 1.8% of silicon, 0.5% of manganese, 0.08% of magnesium, 0.2% of copper, 0.2% of nickel, 0.03% of cerium, 0.08% of yttrium, 0.01% of molybdenum, 0.04% of chromium, 0.004% of titanium, 0.02% of vanadium, 0.03% of phosphorus, 0.01% of sulfur and the balance of iron.
Preferably, the ductile iron edging roll suitable for the universal mill comprises the following element components in percentage by weight:
3.4% of carbon, 2.1% of silicon, 0.8% of manganese, 0.1% of magnesium, 0.4% of copper, 0.3% of nickel, 0.035% of cerium, 0.09% of yttrium, 0.015% of molybdenum, 0.07% of chromium, 0.005% of titanium, 0.025% of vanadium, 0.04% of phosphorus, 0.02% of sulfur and the balance of iron.
Preferably, the ductile iron edging roll suitable for the universal mill comprises the following element components in percentage by weight:
3.6% of carbon, 2.4% of silicon, 1.2% of manganese, 0.12% of magnesium, 0.6% of copper, 0.4% of nickel, 0.04% of cerium, 0.1% of yttrium, 0.02% of molybdenum, 0.1% of chromium, 0.006% of titanium, 0.03% of vanadium, 0.05% of phosphorus, 0.025% of sulfur and the balance of iron.
The invention also provides a manufacturing method of the nodular cast iron edging roll suitable for the universal mill, which comprises the following steps:
s1, weighing the following ingredients in parts by weight:
3.2-3.6% of carbon, 1.8-2.4% of silicon, 0.5-1.2% of manganese, 0.08-0.12% of magnesium, 0.2-0.6% of copper, 0.2-0.4% of nickel, 0.03-0.04% of cerium, 0.08-0.1% of yttrium, 0.01-0.02% of molybdenum, 0.04-0.1% of chromium, 0.004-0.006% of titanium, 0.02-0.03% of vanadium, less than or equal to 0.05% of phosphorus, less than or equal to 0.025% of sulfur and the balance of iron;
s2, melting all the ingredients weighed in the S1 into molten iron by using a medium-frequency induction furnace at 1450-1480 ℃, and refining by using an LF (ladle furnace);
s3, detecting the content of each element in the refined molten iron in S2, adjusting the content of each element to meet the formula requirement, and performing desulfurization treatment on the molten iron by using a KR stirring desulfurization technology;
s4, discharging molten iron, spheroidizing by using rare earth magnesium and a CaSi nodulizer, inoculating by using a FeSi inoculant, and then continuously inoculating by using a CaBa inoculant;
s5, pouring the inoculated molten iron in the S4 into a mold to obtain a casting;
and S6, performing heat treatment to obtain the nodular cast iron edging roll suitable for the universal mill.
Preferably, the specific step of S6 is:
and (3) heating: heating the nodular iron casting to be treated to an annealing temperature along with a furnace, wherein the annealing temperature is 820-860 ℃;
and (3) heat preservation: keeping the nodular iron casting at the annealing temperature for 2-4 hours;
slow cooling: slowly cooling the ductile iron castings along with the furnace for 2-3 hours;
air cooling and temperature reduction: after slow cooling, the nodular iron castings are taken out for air cooling.
Preferably, the temperature is increased to 820-860 ℃ along with the furnace at a speed of 4-6 ℃/min.
Preferably, after the treatment of the air cooling and temperature reduction step, the tensile strength of the nodular cast iron edging roll suitable for the universal mill is more than or equal to 505MPa, and the elongation after fracture is more than or equal to 16.3%.
Compared with the prior art, the invention has the beneficial effects that: the nodular cast iron edging roll suitable for the universal rolling mill provided by the invention has the advantages that the component proportion is reasonable, the nodular cast iron edging roll can be strongly extruded in a high-temperature state for a long time without cracking, the wear resistance, the extrusion toughness and the thermal fatigue resistance are excellent, the on-machine operation time is prolonged, and the service life of the edging roll is better prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The nodular cast iron edging roll suitable for the universal mill comprises the following element components in percentage by weight:
3.2% of carbon, 1.8% of silicon, 0.5% of manganese, 0.08% of magnesium, 0.2% of copper, 0.2% of nickel, 0.03% of cerium, 0.08% of yttrium, 0.01% of molybdenum, 0.04% of chromium, 0.004% of titanium, 0.02% of vanadium, 0.03% of phosphorus, 0.01% of sulfur and the balance of iron.
The invention also provides a manufacturing method of the nodular cast iron edging roll suitable for the universal mill, which comprises the following steps:
s1, weighing the following ingredients in parts by weight:
3.2% of carbon, 1.8% of silicon, 0.5% of manganese, 0.08% of magnesium, 0.2% of copper, 0.2% of nickel, 0.03% of cerium, 0.08% of yttrium, 0.01% of molybdenum, 0.04% of chromium, 0.004% of titanium, 0.02% of vanadium, 0.03% of phosphorus, 0.01% of sulfur and the balance of iron;
s2, melting all the ingredients weighed in S1 into molten iron at 1450 ℃ by using a medium-frequency induction furnace, and refining by using an LF furnace;
s3, detecting the content of each element in the refined molten iron in S2, adjusting the content of each element to meet the formula requirement, and performing desulfurization treatment on the molten iron by using a KR stirring desulfurization technology;
s4, discharging molten iron, spheroidizing by using rare earth magnesium and a CaSi nodulizer, inoculating by using a FeSi inoculant, and then continuously inoculating by using a CaBa inoculant;
s5, pouring the inoculated molten iron in the S4 into a mold to obtain a casting;
s6, heating: heating the nodular iron castings to be treated to an annealing temperature at a speed of 4 ℃/min along with the furnace, wherein the annealing temperature is within 820 ℃;
and (3) heat preservation: keeping the ductile iron casting at the annealing temperature for 2 hours;
slow cooling: slowly cooling the ductile iron castings along with the furnace for 2 hours;
air cooling and temperature reduction: and after slow cooling, taking out the nodular iron castings for air cooling to obtain the nodular iron edge rolling roll suitable for the universal mill.
After the treatment of the air cooling and temperature reduction step, the tensile strength of the nodular cast iron edging roll suitable for the universal mill is more than or equal to 505MPa, and the elongation after fracture is more than or equal to 16.3 percent.
Example 2
The nodular cast iron edging roll suitable for the universal mill comprises the following element components in percentage by weight:
3.4% of carbon, 2.1% of silicon, 0.8% of manganese, 0.1% of magnesium, 0.4% of copper, 0.3% of nickel, 0.035% of cerium, 0.09% of yttrium, 0.015% of molybdenum, 0.07% of chromium, 0.005% of titanium, 0.025% of vanadium, 0.04% of phosphorus, 0.02% of sulfur and the balance of iron.
The invention also provides a manufacturing method of the nodular cast iron edging roll suitable for the universal mill, which comprises the following steps:
s1, weighing the following ingredients in parts by weight:
3.4% of carbon, 2.1% of silicon, 0.8% of manganese, 0.1% of magnesium, 0.4% of copper, 0.3% of nickel, 0.035% of cerium, 0.09% of yttrium, 0.015% of molybdenum, 0.07% of chromium, 0.005% of titanium, 0.025% of vanadium, 0.04% of phosphorus, 0.02% of sulfur and the balance of iron;
s2, melting all the ingredients weighed in S1 into molten iron by using a medium-frequency induction furnace at 1465 ℃, and refining by using an LF furnace;
s3, detecting the content of each element in the refined molten iron in S2, adjusting the content of each element to meet the formula requirement, and performing desulfurization treatment on the molten iron by using a KR stirring desulfurization technology;
s4, discharging molten iron, spheroidizing by using rare earth magnesium and a CaSi nodulizer, inoculating by using a FeSi inoculant, and then continuously inoculating by using a CaBa inoculant;
s5, pouring the inoculated molten iron in the S4 into a mold to obtain a casting;
s6, heating: heating the nodular iron castings to be treated to an annealing temperature within the range of 840 ℃ along with the furnace at the speed of 5 ℃/min;
and (3) heat preservation: keeping the ductile iron casting at the annealing temperature for 3 hours;
slow cooling: slowly cooling the ductile iron castings along with the furnace for 2.5 hours;
air cooling and temperature reduction: and after slow cooling, taking out the nodular iron castings for air cooling to obtain the nodular iron edge rolling roll suitable for the universal mill.
After the treatment of the air cooling and temperature reduction step, the tensile strength of the nodular cast iron edging roll suitable for the universal mill is more than or equal to 505MPa, and the elongation after fracture is more than or equal to 16.3 percent.
Example 3
The nodular cast iron edging roll suitable for the universal mill comprises the following element components in percentage by weight:
3.6% of carbon, 2.4% of silicon, 1.2% of manganese, 0.12% of magnesium, 0.6% of copper, 0.4% of nickel, 0.04% of cerium, 0.1% of yttrium, 0.02% of molybdenum, 0.1% of chromium, 0.006% of titanium, 0.03% of vanadium, 0.05% of phosphorus, 0.025% of sulfur and the balance of iron.
The invention also provides a manufacturing method of the nodular cast iron edging roll suitable for the universal mill, which comprises the following steps:
s1, weighing the following ingredients in parts by weight:
3.6% of carbon, 2.4% of silicon, 1.2% of manganese, 0.12% of magnesium, 0.6% of copper, 0.4% of nickel, 0.04% of cerium, 0.1% of yttrium, 0.02% of molybdenum, 0.1% of chromium, 0.006% of titanium, 0.03% of vanadium, 0.05% of phosphorus, 0.025% of sulfur and the balance of iron;
s2, melting all the ingredients weighed in S1 into molten iron at 1480 ℃ by using a medium-frequency induction furnace, and refining by using an LF furnace;
s3, detecting the content of each element in the refined molten iron in S2, adjusting the content of each element to meet the formula requirement, and performing desulfurization treatment on the molten iron by using a KR stirring desulfurization technology;
s4, discharging molten iron, spheroidizing by using rare earth magnesium and a CaSi nodulizer, inoculating by using a FeSi inoculant, and then continuously inoculating by using a CaBa inoculant;
s5, pouring the inoculated molten iron in the S4 into a mold to obtain a casting;
s6, heating: heating the nodular iron castings to be treated to an annealing temperature within 860 ℃ along with the furnace at a speed of 6 ℃/min;
and (3) heat preservation: keeping the ductile iron casting at the annealing temperature for 4 hours;
slow cooling: slowly cooling the ductile iron castings along with the furnace for 3 hours;
air cooling and temperature reduction: and after slow cooling, taking out the nodular iron castings for air cooling to obtain the nodular iron edge rolling roll suitable for the universal mill.
After the treatment of the air cooling and temperature reduction step, the tensile strength of the nodular cast iron edging roll suitable for the universal mill is more than or equal to 505MPa, and the elongation after fracture is more than or equal to 16.3 percent.
In summary, the following steps: the nodular cast iron edging roll suitable for the universal rolling mill provided by the invention has the advantages that the component proportion is reasonable, the nodular cast iron edging roll can be strongly extruded in a high-temperature state for a long time without cracking, the wear resistance, the extrusion toughness and the thermal fatigue resistance are excellent, the on-machine operation time is prolonged, and the service life of the edging roll is better prolonged.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The nodular cast iron edging roll suitable for the universal rolling mill is characterized by comprising the following element components in percentage by weight:
3.2-3.6% of carbon, 1.8-2.4% of silicon, 0.5-1.2% of manganese, 0.08-0.12% of magnesium, 0.2-0.6% of copper, 0.2-0.4% of nickel, 0.03-0.04% of cerium, 0.08-0.1% of yttrium, 0.01-0.02% of molybdenum, 0.04-0.1% of chromium, 0.004-0.006% of titanium, 0.02-0.03% of vanadium, less than or equal to 0.05% of phosphorus, less than or equal to 0.025% of sulfur and the balance of iron;
the preparation process comprises the following steps:
(1) melting all the ingredients weighed in the step S1 into molten iron by using a medium-frequency induction furnace at 1450-1480 ℃, and refining by using an LF furnace;
(2) detecting the content of each element in the refined molten iron in S2, adjusting the content of each element to meet the formula requirement, and performing desulfurization treatment on the molten iron by using a KR stirring desulfurization technology;
(3) the molten iron is discharged from the furnace and is spheroidized by rare earth magnesium and a CaSi nodulizer, inoculated by a FeSi inoculant and continuously inoculated by a CaBa inoculant;
(4) pouring the inoculated molten iron in the step S4 into a mold to obtain a casting;
(5) obtaining the nodular cast iron edging roll suitable for the universal mill after heat treatment;
in the step (5), the heat treatment comprises the following specific steps:
and (3) heating: heating the nodular iron casting to be treated to an annealing temperature along with a furnace, wherein the annealing temperature is 820-860 ℃;
and (3) heat preservation: keeping the nodular iron casting at the annealing temperature for 2-4 hours;
slow cooling: slowly cooling the ductile iron castings along with the furnace for 2-3 hours;
air cooling and temperature reduction: after slow cooling, the nodular iron castings are taken out for air cooling.
2. The ductile iron edging roll suitable for a universal rolling mill according to claim 1, characterized in that the ductile iron edging roll suitable for a universal rolling mill comprises the following elemental components in percentage by weight:
3.2% of carbon, 1.8% of silicon, 0.5% of manganese, 0.08% of magnesium, 0.2% of copper, 0.2% of nickel, 0.03% of cerium, 0.08% of yttrium, 0.01% of molybdenum, 0.04% of chromium, 0.004% of titanium, 0.02% of vanadium, 0.03% of phosphorus, 0.01% of sulfur and the balance of iron.
3. The ductile iron edging roll suitable for a universal rolling mill according to claim 1, characterized in that the ductile iron edging roll suitable for a universal rolling mill comprises the following elemental components in percentage by weight:
3.4% of carbon, 2.1% of silicon, 0.8% of manganese, 0.1% of magnesium, 0.4% of copper, 0.3% of nickel, 0.035% of cerium, 0.09% of yttrium, 0.015% of molybdenum, 0.07% of chromium, 0.005% of titanium, 0.025% of vanadium, 0.04% of phosphorus, 0.02% of sulfur and the balance of iron.
4. The ductile iron edging roll suitable for a universal rolling mill according to claim 1, characterized in that the ductile iron edging roll suitable for a universal rolling mill comprises the following elemental components in percentage by weight:
3.6% of carbon, 2.4% of silicon, 1.2% of manganese, 0.12% of magnesium, 0.6% of copper, 0.4% of nickel, 0.04% of cerium, 0.1% of yttrium, 0.02% of molybdenum, 0.1% of chromium, 0.006% of titanium, 0.03% of vanadium, 0.05% of phosphorus, 0.025% of sulfur and the balance of iron.
5. A method of manufacturing a ductile iron edging roll suitable for universal rolling mills according to claim 1, characterized by comprising the steps of:
s1, weighing the following ingredients in parts by weight:
3.2-3.6% of carbon, 1.8-2.4% of silicon, 0.5-1.2% of manganese, 0.08-0.12% of magnesium, 0.2-0.6% of copper, 0.2-0.4% of nickel, 0.03-0.04% of cerium, 0.08-0.1% of yttrium, 0.01-0.02% of molybdenum, 0.04-0.1% of chromium, 0.004-0.006% of titanium, 0.02-0.03% of vanadium, less than or equal to 0.05% of phosphorus, less than or equal to 0.025% of sulfur and the balance of iron;
s2, melting all the ingredients weighed in the S1 into molten iron by using a medium-frequency induction furnace at 1450-1480 ℃, and refining by using an LF (ladle furnace);
s3, detecting the content of each element in the refined molten iron in S2, adjusting the content of each element to meet the formula requirement, and performing desulfurization treatment on the molten iron by using a KR stirring desulfurization technology;
s4, discharging molten iron, spheroidizing by using rare earth magnesium and a CaSi nodulizer, inoculating by using a FeSi inoculant, and then continuously inoculating by using a CaBa inoculant;
s5, pouring the inoculated molten iron in the S4 into a mold to obtain a casting;
and S6, performing heat treatment to obtain the nodular cast iron edging roll suitable for the universal mill.
6. The method for manufacturing the ductile iron edging roll suitable for the universal rolling mill according to claim 5, wherein the specific steps of S6 are as follows:
and (3) heating: heating the nodular iron casting to be treated to an annealing temperature along with a furnace, wherein the annealing temperature is 820-860 ℃;
and (3) heat preservation: keeping the nodular iron casting at the annealing temperature for 2-4 hours;
slow cooling: slowly cooling the ductile iron castings along with the furnace for 2-3 hours;
air cooling and temperature reduction: after slow cooling, the nodular iron castings are taken out for air cooling.
7. The method of manufacturing a ductile iron edging roll suitable for universal rolling mills according to claim 6, characterized in that: the temperature is increased to 820-860 ℃ along with the temperature rise of the furnace at the speed of 4-6 ℃/min.
8. The method of manufacturing a ductile iron edging roll suitable for universal rolling mills according to claim 6, characterized in that: after the air cooling and temperature reduction step, the tensile strength of the nodular cast iron edging roll suitable for the universal mill is more than or equal to 505MPa, and the elongation after fracture is more than or equal to 16.3 percent.
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