CN112410654A - Columnar nodular cast iron material and vertical continuous casting process thereof - Google Patents
Columnar nodular cast iron material and vertical continuous casting process thereof Download PDFInfo
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- CN112410654A CN112410654A CN202011193251.8A CN202011193251A CN112410654A CN 112410654 A CN112410654 A CN 112410654A CN 202011193251 A CN202011193251 A CN 202011193251A CN 112410654 A CN112410654 A CN 112410654A
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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
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/113—Treating the molten metal by vacuum treating
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
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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
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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
- C21C7/0025—Adding carbon material
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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
- C21C7/10—Handling in a vacuum
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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
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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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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a columnar nodular cast iron material and a vertical continuous casting process thereof, wherein the formula of the nodular cast iron material comprises the following components in parts by weight: 3.0-4.0% of carbon, 1.8-3.2% of silicon, 0.005-1.0% of manganese, 0.005-1.0% of phosphorus, 0.005-1.0% of sulfur, 0.005-1.0% of chromium, 0.005-0.01% of rare earth elements, 0.005-0.01% of magnesium and the balance of iron. The casting process comprises the steps of feeding materials into a furnace, heating and smelting, adding rare earth elements, heat preservation casting, casting molding and the like. The invention adopts a vertical continuous casting method for casting, most of the iron, carbon and silicon components are put into a smelting furnace for melting and heat preservation, then the rest manganese, phosphorus, sulfur and chromium are respectively added into an alloy liquid, and finally rare earth elements are added for heat preservation casting. The stirring speed and time are finely controlled in the whole process, excessive gas invasion is avoided, the gas in the alloy solution is favorably discharged, and the performance of the nodular cast iron is further improved.
Description
Technical Field
The invention relates to a columnar nodular cast iron material and a vertical continuous casting process thereof.
Background
The nodular cast iron is a high-strength cast iron material developed in the 20 th century and the fifties, has comprehensive properties close to that of steel and excellent properties, and is successfully used for casting parts which are complex in stress and have high requirements on strength, toughness and wear resistance.
However, the casting process of nodular cast iron is very demanding, and there are two main problems as follows. One is shrinkage cavity and shrinkage porosity, and the cast iron produced by the method is often defective due to shrinkage cavity and shrinkage porosity caused by poor feeding due to the solidification characteristics of the nodular cast iron paste. The problem has been researched and developed internationally and domestically, and now, with the development of the technology of applying the computer to the casting research and production fields, the problem is improved well. The other is the defect of air holes, during the production process of the nodular iron casting, holes with diameters of about 0.5-3mm and smooth inner walls in the shapes of spheres, ovals or pinholes are usually found after heat treatment and shot blasting or machining, and the holes are generally distributed 2-3mm below the surface skin of the casting, namely the so-called subcutaneous air holes. The formation of these subcutaneous pores is caused by the fact that the surface tension of the magnesium-containing iron solution is large, and an oxide film is easily formed, which has a certain influence on the inhibition of the discharge of the evolved gas and the invading gas, and these gases are retained subcutaneously to form pores. In addition, the pasty solidification characteristic of the nodular cast iron enables the gas channel to be blocked early, and the formation of subcutaneous pore defects is promoted.
Disclosure of Invention
Aiming at the problems of the nodular cast iron, the invention provides a nodular cast iron material and a vertical continuous casting process thereof, wherein the formula of the nodular cast iron is optimized, and the mechanical property of the gray cast iron is improved by combining the vertical continuous casting technology and process. The specific technical scheme is as follows:
the invention provides a columnar nodular cast iron material, which comprises the following components in parts by weight: 3.0-4.0% of carbon, 1.8-3.2% of silicon, 0.005-1.0% of manganese, 0.005-1.0% of phosphorus, 0.005-1.0% of sulfur, 0.005-1.0% of chromium, 0.005-0.01% of rare earth elements, 0.005-0.01% of magnesium and the balance of iron.
Preferably, the formula of the columnar nodular cast iron material comprises the following components in parts by weight: 3.5-3.8% of carbon, 2-3% of silicon, 0.005-0.8% of manganese, 0.005-0.7% of phosphorus, 0.005-0.6% of sulfur, 0.005-0.5% of chromium, 0.005-0.01% of rare earth elements, 0.005-0.01% of magnesium and the balance of iron.
Preferably, the formula of the columnar nodular cast iron material comprises the following components in parts by weight: 3.6 percent of carbon, 2.5 percent of silicon, 0.1 percent of manganese, 0.1 percent of phosphorus, 0.1 percent of sulfur, 0.5 percent of chromium, 0.01 percent of rare earth element, 0.005 percent of magnesium and the balance of iron.
Preferably, the rare earth element is a mixture of cerium and praseodymium, and the weight ratio of the mixture of the cerium and the praseodymium is 3: 4.
The vertical continuous casting process of the columnar ductile iron material comprises the following steps of:
1) feeding materials into a furnace: weighing iron, carbon and silicon according to a formula, placing the iron, carbon and silicon into a power frequency electric furnace for vacuum smelting, heating to completely melt the iron, carbon and silicon, and then preserving heat in a vacuum state;
2) heating and smelting: weighing manganese, phosphorus, sulfur and chromium according to a formula, adding the manganese, phosphorus, sulfur and chromium into the heat-preserved iron, carbon and silicon solution, stirring to fully melt and mix the manganese, phosphorus, sulfur and chromium into an alloy solution, covering scaly graphite powder on the solution, and preserving heat in a vacuum state;
3) adding rare earth elements: putting the rare earth elements into the alloy solution, continuously heating and smelting, and continuously stirring to melt the rare earth elements and uniformly mixing the rare earth elements with the alloy solution;
4) heat preservation casting: after adding rare earth elements, keeping for a period of time after the temperature of the alloy solution rises to a certain temperature, and carrying out heat preservation casting;
5) casting and forming: after heat preservation casting, the temperature is raised again, a vibration device of a power frequency electric furnace is started, and the alloy solution is cast into the columnar nodular cast iron material by adopting a vertical continuous casting method.
In a preferable technical scheme, in the step 1), the heating temperature for completely melting the iron, the carbon and the silicon is 750-1000 ℃; the heat preservation temperature of the heat preservation under the vacuum state is 860-980 ℃, and the heat preservation time is 45 minutes-1 hour.
In a preferable technical scheme, in the step 2), the stirring tool is a graphite tool, and the thickness of the covering scaly graphite powder is 10 cm-15 cm; the heat preservation temperature of the heat preservation in the vacuum state is 900-950 ℃, and the heat preservation time is 30-45 minutes; the stirring speed is controlled to be 200-500 revolutions per minute, and the stirring time is 20-30 minutes.
As a preferable technical scheme, in the step 3), the rare earth element is cerium and praseodymium which are mixed according to a weight ratio of 4:3 and then are put into an alloy solution; the temperature for continuously heating and smelting is 1050-1100 ℃; the stirring speed is controlled to be 200-300 revolutions per minute, and the stirring time is 15-20 minutes.
As a preferable technical scheme, in the step 4), the heat preservation casting is carried out in two steps, wherein the heat preservation in the first step is carried out at 1050 ℃, and the heat preservation time is 1 hour; the second step is carried out at 1110 ℃ with the heat preservation time of 30-45 minutes; and sampling and detecting the component content of the alloy solution during the first heat preservation.
Preferably, in step 5), the temperature for reheating in the casting is 1200 ℃.
The invention has the beneficial effects that:
the columnar nodular cast iron material is cast by a vertical continuous casting method, and most of iron, carbon and silicon components are put into a smelting furnace for melting and heat preservation to be uniformly mixed; then adding the rest manganese, phosphorus, sulfur and chromium into the alloy liquid respectively, and controlling the stirring speed to ensure that the manganese, the phosphorus, the sulfur and the chromium are fused again; and finally, adding rare earth elements, carrying out heat preservation casting, and putting the components in batches in the whole process to avoid excessive gas invasion of the alloy solution caused by long-time mixing and stirring, finely controlling the stirring speed and the stirring time, avoiding the gas invasion, promoting the excessive gas discharge of the alloy solution and reducing the subcutaneous gas hole side cause. In addition, in combination with the pasty solidification characteristic of the nodular cast iron, the vertical continuous casting method is adopted, the vertical crystallizer is injected from the middle tank, the gas discharge of the alloy solution is facilitated, the casting blank is cooled uniformly, the symmetry of the solidification structure is good, and the performance of the nodular cast iron is further improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Examples 1 to 3 show the casting of a columnar spheroidal graphite cast iron material by a vertical continuous casting method, and example 4 shows an effect example.
Example 1
Weighing iron, carbon, silicon, manganese, phosphorus, sulfur, chromium, magnesium and rare earth elements according to the formula; wherein: 3.0% of carbon, 1.8% of silicon, 0.005% of manganese, 0.005% of phosphorus, 0.005% of sulfur, 0.005% of chromium, 0.005% of rare earth element, 0.005% of magnesium and the balance of iron.
Firstly, putting iron, carbon and silicon into a power frequency electric furnace for vacuum smelting, heating to 750 ℃ to completely melt the iron, the carbon and the silicon, and then preserving heat under a vacuum state, wherein the heat preservation temperature is 860 ℃ and the heat preservation time is 45 minutes.
Then adding manganese, phosphorus, sulfur and chromium into the heat-preserved iron, carbon and silicon solution, stirring to fully melt and uniformly mix the manganese, phosphorus, sulfur and chromium into the alloy solution, controlling the stirring speed to be 200 revolutions per minute, and stirring for 20 minutes; and covering 10cm thick flaky graphite powder on the solution, and keeping the temperature at 900 ℃ for 30 minutes in a vacuum state.
Adding rare earth elements, mixing the rare earth elements cerium and praseodymium according to the weight ratio of 3:4, adding the mixture into an alloy solution, continuously heating to 1050 ℃, continuously smelting, and continuously stirring to melt the rare earth elements and uniformly mixing the rare earth elements with the alloy solution; the stirring speed was controlled at 200 rpm and the stirring was carried out for 15 minutes.
After adding rare earth elements, keeping for a period of time after the temperature of the alloy solution rises to a certain temperature, and carrying out heat preservation casting; the heat preservation is carried out in two steps, the first step is carried out at 1050 ℃, and the heat preservation time is 1 hour; the second step is carried out at 1110 ℃ for 30 minutes; and sampling and detecting the component content of the alloy solution during the first heat preservation.
After heat preservation casting, the temperature is raised to 1200 ℃ again, a vibration device of the power frequency electric furnace is started, and the alloy solution is cast into the columnar nodular cast iron material by adopting a vertical continuous casting method.
Example 2
Weighing iron, carbon, silicon, manganese, phosphorus, sulfur, chromium, magnesium and rare earth elements according to the formula; wherein: 3.6 percent of carbon, 2.5 percent of silicon, 0.1 percent of manganese, 0.1 percent of phosphorus, 0.1 percent of sulfur, 0.5 percent of chromium, 0.01 percent of rare earth element, 0.005 percent of magnesium and the balance of iron.
Firstly, putting iron, carbon and silicon into a power frequency electric furnace for vacuum smelting, heating to 880 ℃ to completely melt the iron, the carbon and the silicon, and then preserving heat in a vacuum state, wherein the heat preservation temperature is 920 ℃, and the heat preservation time is 45 minutes to 1 hour.
Then adding manganese, phosphorus, sulfur and chromium into the heat-preserved iron, carbon and silicon solution, stirring to fully melt and uniformly mix the manganese, phosphorus, sulfur and chromium into the alloy solution, controlling the stirring speed to be 300 revolutions per minute, and stirring for 25 minutes; and covering scaly graphite powder with the thickness of 15cm on the solution, and preserving heat in a vacuum state, wherein the heat preservation temperature is 925 ℃ and the heat preservation time is 40 minutes.
Adding rare earth elements, mixing the rare earth elements cerium and praseodymium according to the weight ratio of 3:4, adding the mixture into an alloy solution, continuously heating to 1100 ℃, continuously smelting, and continuously stirring to melt the rare earth elements and uniformly mixing the rare earth elements with the alloy solution; the stirring speed was controlled at 250 rpm and the stirring was carried out for 15 minutes.
After adding rare earth elements, keeping for a period of time after the temperature of the alloy solution rises to a certain temperature, and carrying out heat preservation casting; the heat preservation is carried out in two steps, the first step is carried out at 1050 ℃, and the heat preservation time is 1 hour; the second step of heat preservation is carried out at 1110 ℃ for 40 minutes; and sampling and detecting the component content of the alloy solution during the first heat preservation.
After heat preservation casting, the temperature is raised to 1200 ℃ again, a vibration device of the power frequency electric furnace is started, and the alloy solution is cast into the columnar nodular cast iron material by adopting a vertical continuous casting method.
Example 3
Weighing iron, carbon, silicon, manganese, phosphorus, sulfur, chromium, magnesium and rare earth elements according to the formula; wherein: 4.0% of carbon, 3.2% of silicon, 0.005% of manganese, 0.005% of phosphorus, 0.005% of sulfur, 0.005% of chromium, 0.005% of rare earth element, 0.01% of magnesium and the balance of iron.
Firstly, putting iron, carbon and silicon into a power frequency electric furnace for vacuum smelting, heating to 1000 ℃ to completely melt the iron, the carbon and the silicon, and then preserving heat under a vacuum state, wherein the heat preservation temperature is 980 ℃ and the heat preservation time is 1 hour.
Then adding manganese, phosphorus, sulfur and chromium into the heat-preserved iron, carbon and silicon solution, stirring to fully melt and mix the manganese, phosphorus, sulfur and chromium into the alloy solution, controlling the stirring speed at 500 revolutions per minute, and stirring for 30 minutes; and covering scaly graphite powder with the thickness of 15cm on the solution, and preserving heat under a vacuum state, wherein the heat preservation temperature is 950 ℃, and the heat preservation time is 45 minutes.
Adding rare earth elements, mixing the rare earth elements cerium and praseodymium according to the weight ratio of 3:4, adding the mixture into an alloy solution, continuously heating to 1100 ℃, continuously smelting, and continuously stirring to melt the rare earth elements and uniformly mixing the rare earth elements with the alloy solution; the stirring speed was controlled at 300 rpm and the stirring was carried out for 20 minutes.
After adding rare earth elements, keeping for a period of time after the temperature of the alloy solution rises to a certain temperature, and carrying out heat preservation casting; the heat preservation is carried out in two steps, the first step is carried out at 1050 ℃, and the heat preservation time is 1 hour; the second step of heat preservation is carried out at 1110 ℃ for 45 minutes; and sampling and detecting the component content of the alloy solution during the first heat preservation.
After heat preservation casting, the temperature is raised to 1200 ℃ again, a vibration device of the power frequency electric furnace is started, and the alloy solution is cast into the columnar nodular cast iron material by adopting a vertical continuous casting method.
Example 4
In this embodiment, mechanical property detection tests are performed on the nodular cast iron materials cast in embodiments 1 to 3, and meanwhile, the test conditions are shown in table 1 by taking the common nodular cast iron materials of the same specification as a comparison:
TABLE 1 mechanical property test results for nodular cast iron materials
| Test items | Example 1 | Example 2 | Example 3 | Comparative example |
| Tensile strength (MPa) | 565 | 621 | 589 | 456 |
| Conditioned yield strength (MPa) | 484 | 521 | 453 | 362 |
| Elongation (mm) | 32 | 39 | 34 | 18 |
| Hardness (HB) | 187 | 201 | 198 | 177 |
As is apparent from the above table, the tensile strength, conditioned yield strength, elongation and hardness of the nodular cast iron material cast by the method of the invention are superior to those of common nodular cast iron with the same specification.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Furthermore, it should be understood that although the present specification describes embodiments, this does not include only one embodiment, and such description is for clarity only, and those skilled in the art should be able to make the specification as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. A columnar nodular cast iron material is characterized in that: the formula comprises the following components in parts by weight: 3.0-4.0% of carbon, 1.8-3.2% of silicon, 0.005-1.0% of manganese, 0.005-1.0% of phosphorus, 0.005-1.0% of sulfur, 0.005-1.0% of chromium, 0.005-0.01% of rare earth elements, 0.005-0.01% of magnesium and the balance of iron.
2. The columnar spheroidal graphite cast iron material according to claim 1, wherein: the formula comprises the following components in parts by weight: 3.5-3.8% of carbon, 2-3% of silicon, 0.005-0.8% of manganese, 0.005-0.7% of phosphorus, 0.005-0.6% of sulfur, 0.005-0.5% of chromium, 0.005-0.01% of rare earth elements, 0.005-0.01% of magnesium and the balance of iron.
3. The columnar spheroidal graphite cast iron material according to claim 2, wherein: the formula comprises the following components in parts by weight: 3.6 percent of carbon, 2.5 percent of silicon, 0.1 percent of manganese, 0.1 percent of phosphorus, 0.1 percent of sulfur, 0.5 percent of chromium, 0.01 percent of rare earth element, 0.005 percent of magnesium and the balance of iron.
4. The columnar spheroidal graphite cast iron material according to claim 3, wherein: the rare earth element is a mixture of cerium and praseodymium, and the weight ratio of the mixture of the cerium and the praseodymium is 3: 4.
5. The vertical continuous casting process of the columnar ductile iron material according to any one of claims 1 to 4, wherein: the method comprises the following steps:
1) feeding materials into a furnace: weighing iron, carbon and silicon according to a formula, placing the iron, carbon and silicon in a power frequency electric furnace for vacuum smelting, heating to completely melt the iron, carbon and silicon, and then preserving heat in a vacuum state;
2) heating and smelting: weighing manganese, phosphorus, sulfur and chromium according to a formula, adding the manganese, phosphorus, sulfur and chromium into the heat-preserved iron, carbon and silicon solution, stirring to fully melt and mix the manganese, phosphorus, sulfur and chromium into an alloy solution, covering scaly graphite powder on the solution, and preserving heat in a vacuum state;
3) adding rare earth elements: putting the rare earth elements into the alloy solution, continuously heating and smelting, and continuously stirring to melt the rare earth elements and uniformly mixing the rare earth elements with the alloy solution;
4) heat preservation casting: after adding rare earth elements, keeping for a period of time after the temperature of the alloy solution rises to a certain temperature, and carrying out heat preservation casting;
5) casting and forming: after heat preservation casting, the temperature is raised again, a vibration device of a power frequency electric furnace is started, and the alloy solution is cast into the columnar nodular cast iron material by adopting a vertical continuous casting method.
6. The vertical continuous casting process of a columnar ductile iron material according to claim 5, wherein: in the step 1), the heating temperature for completely melting the iron, the carbon and the silicon is 750-1000 ℃; the heat preservation temperature of the heat preservation under the vacuum state is 860-980 ℃, and the heat preservation time is 45 minutes-1 hour.
7. The vertical continuous casting process of a columnar ductile iron material according to claim 4, wherein: in the step 2), the stirring tool is a graphite tool, and the thickness of the covering flaky graphite powder is 10-15 cm; the heat preservation temperature of the heat preservation in the vacuum state is 900-950 ℃, and the heat preservation time is 30-45 minutes; the stirring speed is controlled to be 200-500 revolutions per minute, and the stirring time is 20-30 minutes.
8. The vertical continuous casting process of a columnar ductile iron material according to claim 5, wherein: in the step 3), the rare earth element is cerium and praseodymium which are mixed according to the weight ratio of 4:3 and then are put into an alloy solution; the temperature for continuously heating and smelting is 1050-1100 ℃; the stirring speed is controlled to be 200-300 revolutions per minute, and the stirring time is 15-20 minutes.
9. The horizontal continuous casting process of the bar-shaped gray cast iron material according to claim 5, wherein: in the step 4), the heat preservation casting is carried out in two steps, wherein the heat preservation in the first step is carried out at 1050 ℃, and the heat preservation time is 1 hour; the second step is carried out at 1110 ℃ with the heat preservation time of 30-45 minutes; and sampling and detecting the component content of the alloy solution during the first heat preservation.
10. The horizontal continuous casting process of the bar-shaped gray cast iron material according to claim 5, wherein: in the step 5), the temperature for reheating in the casting is 1200 ℃.
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