CN110983165A - Inoculant for nodular cast iron and preparation method thereof - Google Patents
Inoculant for nodular cast iron and preparation method thereof Download PDFInfo
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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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
- C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
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Abstract
The invention relates to the field of nodular cast iron, in particular to an inoculant for nodular cast iron and a preparation method thereof, wherein the preparation method comprises the following steps: the following raw materials in parts by weight: feeding 75# ferrosilicon, 30# silico-calcium, 30# rare earth silicon, 30# silico-barium, 35# silico-zirconium, 70# ferrocolumbium and scrap steel into an electric furnace for heating and melting, wherein the melting temperature is controlled within the range of 1530 ℃ and 1600 ℃; and after the raw materials are completely melted, adding iron black, sulfur and antimony into the furnace, continuously preserving heat, stirring and smelting, pouring into the furnace, casting and rapidly cooling to obtain the inoculant for the nodular cast iron. The invention has the beneficial effects that: the inoculant for the nodular cast iron has the characteristics of providing nucleation particles, improving the graphite balling capacity in molten iron, improving the uniformity of graphite balls, improving the balling rate and the like. Effectively reduces the chilling tendency of the nodular cast iron, and improves the mechanical properties and mechanical properties of the nodular cast iron, such as tensile strength, impact toughness, wear resistance, hardness and the like.
Description
Technical Field
The invention relates to the field of nodular cast iron, and particularly relates to an inoculant for nodular cast iron and a preparation method thereof.
Background
The inoculant is also called as an inoculant and is an additive with the functions of grain refinement, mechanical property improvement and processability improvement in the casting process. It can improve graphite form and distribution, increase eutectic group quantity, slow down spheroidization recession, and can prevent or eliminate casting white cast tendency and reduce section sensitivity. The inoculant is added into the molten iron after spheroidization, so that the number of graphite balls can be increased, cementite is eliminated, and the plasticity and the toughness are improved.
At present, the mainstream inoculant in the market is mainly ferrosilicon, calcium silicon, barium silicon and corresponding silicon multi-element alloy. The prior inoculant can cause the phenomena of small quantity of graphite nodules in the core part of a casting, low balling rate, abnormal graphite and the like in the using process, particularly in the casting process of a thick and large casting, so that the mechanical property and the mechanical property of a nodular iron casting are reduced, and the produced device can not meet the requirement of special environment operation. Aiming at the problems of the existing inoculant, a novel sulfur-oxygen inoculant is developed by an Eken method, the process comprises the steps of preparing a silicon-cerium alloy with proper components and proper granularity, then binding sulfide and oxide ultrafine powder to be in liquid state and spraying the binding liquid to the surface of silicon-cerium alloy particles, and drying to obtain the sulfur-oxygen inoculant; the Yuzhou Henlilai alloy Limited liability company patent 201711194589.3 discloses the preparation of a suitable composition, particle size, lanthanum silicate alloy, and then mixing the lanthanum silicate alloy directly with FeS and FeO powders to prepare a sulfur-oxygen inoculant.
The method adopts a physical mixing and bonding mode to prepare the sulfur-containing and oxygen-containing inoculant, the novel inoculant can improve and promote the form and the quantity of graphite nodules in the nodular cast iron in a certain degree, the hardness and the tensile strength of the nodular cast iron are promoted, but the requirements of special environment operation on castings with higher mechanical properties cannot be met.
Disclosure of Invention
The invention aims to provide an inoculant for nodular cast iron and a preparation method thereof, wherein the inoculant can be used for improving the mechanical properties and mechanical properties of the nodular cast iron, such as tensile strength, impact toughness, wear resistance, hardness and the like.
In order to solve the technical problems, the invention adopts the technical scheme that: the inoculant for the nodular cast iron is prepared from the following raw materials in parts by weight: 150 parts of 75# ferrosilicon 130-one, 4-6 parts of 30# calcium silicon, 6-10 parts of 30# rare earth silicon (the lanthanum/cerium ratio in the rare earth is 35/65), 1-3.5 parts of 30# barium silicon, 1-3 parts of 35# zirconium silicon, 0.5-1.0 part of 70# ferroniobium, 2-4 parts of scrap steel, 1-2.5 parts of sulfur, 0.45-0.85 part of iron black and 0.45-0.85 part of antimony;
the special-effect inoculant comprises the following components in percentage by mass: si: 68-75%, Ca: 0.7-1.5%, La/Ce: 1.5-2.1%, Al: 0.7-1.5%, Ba: 0.3-0.8%, Zr: 0.3-0.8%, Nb: 0.3-0.8%, S: 0.45-0.75%, O: 0.25 to 0.55%, Sb: 0.25-0.55%, and the balance of iron.
The other technical scheme of the invention is as follows: the preparation method of the inoculant for the nodular cast iron comprises the following steps:
the following raw materials in parts by weight: 150 parts of 75# ferrosilicon 130-plus, 4-6 parts of 30# calcium silicon, 6-10 parts of 30# rare earth silicon, 1-3.5 parts of 30# barium silicon, 1-3 parts of 35# zirconium silicon, 0.5-1.0 part of 70# ferroniobium and 2-4 parts of scrap steel are put into an electric furnace for heating and melting, and the melting temperature is controlled within the range of 1530-plus 1600 ℃;
after the raw materials are completely melted, 0.45-0.85 part of iron oxide black, 1-2.5 parts of sulfur and 0.45-0.85 part of antimony are added into the furnace, the mixture is continuously kept warm, stirred and smelted for 2-5min, and the mixture is poured into the furnace for casting and rapidly cooled to obtain the inoculant for the nodular cast iron.
The invention has the beneficial effects that: in the preparation method of the inoculant for the nodular cast iron, the inoculant produced by a melting and matching method is uniformly distributed, and the iron black, the sulfur and the antimony are added in the later period mainly for reducing loss, so that the sulfur and the oxygen are dispersed and uniformly distributed in the crystal lattice gaps of the silicon alloy, and the inoculation nucleation capability of an inoculant product on graphite in molten iron is improved. The sulfur and oxygen are added to interact with elements such as lanthanum-cerium rare earth, calcium, aluminum and the like to provide nucleation particles; the addition of a proper amount of antimony element mainly aims to ensure that graphite in molten iron in the presence of rare earth lanthanum cerium tends to be uniform and small in size; the introduction of zirconium and niobium mainly reduces white cast, promotes nucleation, increases supercooling degree, and improves the mechanical properties of ductile cast iron, such as tensile strength, impact toughness, wear resistance, hardness and the like.
The inoculant for the nodular cast iron is prepared by a high-temperature smelting process, multiple elements are combined in a chemical reaction mode, the inoculant is applied to a treatment process outside a molten iron furnace, the treatment temperature requirement is low, the process flow is simple, the prepared special-effect inoculant can be used for inoculation treatment after spheroidization of nodular cast iron pieces, particularly thick and large nodular cast iron pieces, and the inoculant has the characteristics of providing nucleation mass points, improving the graphite balling capacity in molten iron, being good in graphite ball uniformity, improving the balling rate and the like. Effectively reduces the chilling tendency of the nodular cast iron, improves the mechanical properties and mechanical properties of the nodular cast iron, such as tensile strength, impact toughness, wear resistance, hardness and the like, and can produce the nodular cast iron with excellent quality.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.
The invention provides an inoculant for nodular cast iron, which is prepared from the following raw materials in parts by weight: 150 parts of 75# ferrosilicon 130-doped materials, 4-6 parts of 30# calcium silicon, 6-10 parts of 30# rare earth silicon (the rare earth silicon contains 30% of rare earth elements (lanthanum/cerium), and the balance is elements such as silicon, iron and the like), 1-3.5 parts of 30# barium silicon, 1-3 parts of 35# zirconium silicon, 0.5-1.0 part of 70# ferroniobium, 2-4 parts of scrap steel, 1-2.5 parts of sulfur, 0.45-0.85 part of iron black and 0.45-0.85 part of antimony;
the special-effect inoculant comprises the following components in percentage by mass: si: 68-75%, Ca: 0.7-1.5%, La/Ce: 1.5-2.1%, Al: 0.7-1.5%, Ba: 0.3-0.8%, Zr: 0.3-0.8%, Nb: 0.3-0.8%, S: 0.45-0.75%, O: 0.25 to 0.55%, Sb: 0.25-0.55%, and the balance of iron.
Preferably, in the inoculant for nodular cast iron, the specific inoculant comprises the following components in percentage by mass: si: 71.5%, Ca: 1.1%, La/Ce: 1.98%, Al: 0.89%, Ba: 0.47%, Zr: 0.43%, Nb: 0.51%, S: 0.46%, O: 0.31%, Sb: 0.36 percent, and the balance being iron.
Preferably, in the inoculant for nodular cast iron, the specific inoculant comprises the following components in percentage by mass: si: 73.3%, Ca: 1.21%, La/Ce: 1.78%, Al: 0.92%, Ba: 0.40%, Zr: 0.38%, Nb: 0.44%, S: 0.475%, O: 0.28%, Sb: 0.30% and the balance of iron.
The invention also provides a preparation method of the inoculant for nodular cast iron, which comprises the following steps:
150 parts of 75# ferrosilicon 130-one, 4-6 parts of 30# calcium silicon, 6-10 parts of 30# rare earth silicon (the lanthanum/cerium ratio in rare earth is 30/70), 1-3.5 parts of 30# barium silicon, 1-3 parts of 35# zirconium silicon, 0.5-1.0 part of 70# ferroniobium and 2-4 parts of scrap steel are put into an electric furnace for heating and melting, and the melting temperature is controlled within the range of 1530-1600 ℃;
after the raw materials are completely melted, 0.45-0.85 part of iron oxide black, 1-2.5 parts of sulfur and 0.45-0.85 part of antimony are added into the furnace, the mixture is continuously kept warm, stirred and smelted for 2-5min, and the mixture is poured into the furnace for casting and rapidly cooled to obtain the inoculant for the nodular cast iron.
Preferably, in the above method for preparing an inoculant for nodular cast iron, the step of "pouring into a furnace and rapidly cooling" further comprises the following steps: cooling and crushing the mixture to the granularity of 0.1-0.9mm to obtain the inoculant for the nodular cast iron. The raw materials are as follows: the purities of the scrap steel, the sulfur, the iron black and the antimony are more than 98.5 percent.
Preferably, in the above method for preparing an inoculant for spheroidal graphite cast iron, the raw materials: the purities of the scrap steel, the sulfur, the iron black and the antimony are more than 98.5 percent.
The invention has the beneficial effects that: in the preparation method of the inoculant for the nodular cast iron, the inoculant produced by a melting and matching method is uniformly distributed, and the iron black, the sulfur and the antimony are added in the later period mainly for reducing loss, so that the sulfur and the oxygen are dispersed and uniformly distributed in the crystal lattice gaps of the silicon alloy, and the inoculation nucleation capability of an inoculant product on graphite in molten iron is improved. The sulfur and oxygen are added to interact with elements such as lanthanum-cerium rare earth, calcium, aluminum and the like to provide nucleation particles; the addition of a proper amount of antimony element mainly aims to ensure that graphite in molten iron in the presence of rare earth lanthanum cerium tends to be uniform and small in size; the introduction of zirconium and niobium mainly reduces white cast, promotes nucleation, increases supercooling degree, and improves the mechanical properties of ductile cast iron, such as tensile strength, impact toughness, wear resistance, hardness and the like.
Example 1
A preparation method of an inoculant for nodular cast iron comprises the following steps:
weighing 142 parts of raw material No. 75 ferrosilicon, 4 parts of 30 silicon calcium, 7.6 parts of 30 rare earth silicon (the lanthanum/cerium ratio in rare earth is 30/70), 2.3 parts of 30 silicon barium, 2 parts of 35 silicon zirconium, 0.66 part of 70 ferroniobium and 2 parts of scrap steel, putting the raw materials into an electric furnace for heating and melting, controlling the melting temperature within the range of 1550-. The special-effect inoculant comprises the following components in percentage by mass: si: 71.5%, Ca: 1.1%, La/Ce: 1.98%, Al: 0.89%, Ba: 0.47%, Zr: 0.43%, Nb: 0.51%, S: 0.46%, O: 0.31%, Sb: 0.36 percent, and the balance being iron.
The purity of the used raw materials, namely scrap steel, sulfur, iron black and antimony, is required to be more than 98.5 percent.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the obtained nodular cast iron part has the tensile strength of 417.6N/mm in detection2Yield strength of 297.0N/mm2The elongation was 15.66%. Compared with the normal inoculant inoculated casting, the comprehensive mechanical index of the casting is improved by about 25 percent, and the mechanical property are excellent.
Example 2
A preparation method of an inoculant for nodular cast iron comprises the following steps:
135 parts of raw material No. 75 silicon iron, 5 parts of 30 silicon calcium, 6.3 parts of 30 rare earth silicon (the lanthanum/cerium ratio in rare earth is 30/70), 1.25 parts of 30 silicon barium, 1.35 parts of 35 silicon zirconium, 0.54 part of 70 niobium iron and 2.5 parts of scrap steel are weighed and put into an electric furnace for heating and melting, the melting temperature is controlled within the range of 1530 plus 1600 ℃, when the raw materials are completely melted, 0.48 part of iron black, 1.25 parts of sulfur and 0.47 part of antimony are put into the furnace, the furnace is continuously heated, stirred and melted for 2.5min, the materials are poured into the furnace for special-effect quick cooling, and the materials are crushed to the granularity of 0.1-0.9mm after cooling, thus obtaining the required inoculant product. The special-effect inoculant comprises the following components in percentage by mass: si: 73.3%, Ca: 1.21%, La/Ce: 1.78%, Al: 0.92%, Ba: 0.40%, Zr: 0.38%, Nb: 0.44%, S: 0.475%, O: 0.28%, Sb: 0.30% and the balance of iron.
The purity of the used raw materials, namely scrap steel, sulfur, iron black and antimony, is required to be more than 98.5 percent.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the detected tensile strength of the obtained nodular cast iron piece is 409.6N/mm2Yield strength of 306.3N/mm2The elongation was 17.01%. Compared with the normal inoculant inoculated casting, the comprehensive mechanical index of the casting is improved by about 20 percent, and the mechanical property are excellent.
Example 3
A preparation method of an inoculant for nodular cast iron comprises the following steps:
147 parts of raw material No. 75 silicon iron, 5.7 parts of 30 silicon calcium, 9.5 parts of 30 rare earth silicon (the lanthanum/cerium ratio in rare earth is 30/70), 3.5 parts of 30 silicon barium, 3 parts of 35 silicon zirconium, 1 part of 70 niobium iron and 3 parts of scrap steel are weighed and put into an electric furnace for heating and melting, the melting temperature is controlled within the range of 1550-.
The special-effect inoculant comprises the following components in percentage by mass: si: 72.4%, Ca: 1.37%, La/Ce: 1.99%, Al: 1.14%, Ba: 0.57%, Zr: 0.61%, Nb: 0.72%, S: 0.51%, O: 0.39%, Sb: 0.50 percent and the balance of iron.
The purity of the used raw materials, namely scrap steel, sulfur, iron black and antimony, is required to be more than 98.5 percent.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the obtained nodular cast iron part has the tensile strength of 426.5N/mm in detection2Yield strength of 309.3N/mm2The elongation was 13.29%. Compared with the normal inoculant inoculated casting, the comprehensive mechanical index of the casting is improved by about 30 percent, and the mechanical property are excellent.
Example 4
A preparation method of an inoculant for nodular cast iron comprises the following steps:
the following raw materials in parts by weight: 150 parts of 75# ferrosilicon, 4 parts of 30# calcium silicon, 6 parts of 30# rare earth silicon (the lanthanum/cerium ratio in the rare earth is 35/65), 1 part of 30# barium silicon, 1 part of 35# zirconium silicon, 0.5 part of 70# ferroniobium and 2 parts of scrap steel are put into an electric furnace for heating and melting, and the melting temperature is controlled within the range of 1530 ℃ and 1600 ℃;
and after the raw materials are completely melted, adding 0.45 part of iron oxide black, 1 part of sulfur and 0.45 part of antimony into the furnace, continuously preserving heat, stirring and smelting for 2-5min, pouring into the furnace, rapidly cooling, and crushing to the granularity of 0.1-0.9mm after cooling to obtain the inoculant for the nodular cast iron.
The purity of the scrap steel, the sulfur, the iron black and the antimony in the raw materials is more than 98.5 percent.
The special-effect inoculant comprises the following components in percentage by mass: si: 75%, Ca: 0.7%, La/Ce: 1.5%, Al: 0.7%, Ba: 0.3%, Zr: 0.3%, Nb: 0.3%, S: 0.45%, O: 0.25%, Sb: 0.25% and the balance of iron.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the obtained nodular cast iron part has the tensile strength of 446.5N/mm in detection2Yield strength of 319.7N/mm2The elongation was 15.21%. Compared with the normal inoculant inoculated casting, the comprehensive mechanical index of the casting is improved by about 25 percent, and the mechanical property are excellent.
Example 5
A preparation method of an inoculant for nodular cast iron comprises the following steps:
the following raw materials in parts by weight: 130 parts of 75# ferrosilicon, 6 parts of 30# calcium silicon, 10 parts of 30# rare earth silicon (the lanthanum/cerium ratio in the rare earth is 35/65), 3.5 parts of 30# barium silicon, 3 parts of 35# zirconium silicon, 1.0 part of 70# ferroniobium and 4 parts of scrap steel are put into an electric furnace for heating and melting, and the melting temperature is controlled within the range of 1530 ℃ and 1600 ℃;
and after the raw materials are completely melted, adding 0.85 part of iron oxide black, 2.5 parts of sulfur and 0.85 part of antimony into the furnace, continuously preserving heat, stirring and smelting for 2-5min, pouring into the furnace, rapidly cooling, and crushing to the granularity of 0.1-0.9mm to obtain the inoculant for the nodular cast iron.
The purity of the scrap steel, the sulfur, the iron black and the antimony in the raw materials is more than 98.5 percent.
The special-effect inoculant comprises the following components in percentage by mass: si: 68%, Ca: 1.5%, La/Ce: 2.1%, Al: 1.5%, Ba: 0.8%, Zr: 0.8%, Nb: 0.8%, S: 0.75%, O: 0.55%, Sb: 0.55 percent and the balance of iron.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the detected tensile strength of the obtained nodular cast iron piece is 406.5N/mm2Yield strength of 289.3N/mm2The elongation was 12.29%. Compared with the normal inoculant inoculated casting, the comprehensive mechanical index of the casting is improved by about 30 percent, and the mechanical property are excellent.
Comparative example 1
A preparation method of an inoculant for nodular cast iron comprises the following steps:
weighing 140 parts of raw material No. 75 silicon iron, 5.5 parts of 30 silicon calcium, 7 parts of 30 rare earth silicon (the lanthanum/cerium ratio in rare earth is 30/70), 2.5 parts of 30 silicon barium, 2 parts of 35 silicon zirconium, 0.75 part of 70 niobium iron and 2 parts of scrap steel, putting into an electric furnace for heating and melting, controlling the melting temperature within the range of 1550-. The special-effect inoculant comprises the following components in percentage by mass: si: 72.65%, Ca: 0.96%, La/Ce: 1.97%, Al: 0.91%, Ba: 0.52%, Zr: 0.47%, Nb: 0.455%, S: 0.011%, O: 0.06%, Sb: 0.35% and the balance iron.
The purity of the used raw material scrap steel and antimony is required to be more than 98.5 percent.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the obtained nodular cast iron part has the tensile strength of 327.2N/mm in detection2Yield strength of 235.4Nmm2The elongation was 4.8%. The comprehensive mechanical index of the casting is slightly worse than that of the casting inoculated by a normal inoculant, the mechanical property and the mechanical property performance are poorer, and nucleation particles are mainly provided for the combination of the inoculant lack of sulfur and oxygen elements, rare earth and other elements.
Comparative example 2
A preparation method of an inoculant for nodular cast iron comprises the following steps:
weighing 140 parts of raw material No. 75 silicon iron, 5 parts of 30 silicon calcium, 8.5 parts of 30 rare earth silicon (the lanthanum/cerium ratio in rare earth is 30/70), 2.5 parts of 30 silicon barium, 0 part of 35 silicon zirconium, 0 part of 70 niobium iron and 2 parts of scrap steel, putting into an electric furnace for heating and melting, controlling the melting temperature within the range of 1550-. The special-effect inoculant comprises the following components in percentage by mass: si: 70.48%, Ca: 0.95%, La/Ce: 2.06%, Al: 1.21%, Ba: 0.62%, Zr: 0.0%, Nb: 0.0%, S: 0.49%, O: 0.287%, Sb: 0.43 percent, and the balance being iron.
The purity of the used raw materials, namely scrap steel, sulfur, iron black and antimony, is required to be more than 98.5 percent.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the obtained nodular cast iron part has the detected tensile strength of 357.9N/mm2Yield strength of 203.6N/mm2The elongation was 5.96%. The comprehensive mechanical index of the casting is poorer than that of the casting inoculated by a normal inoculant, the mechanical property and the mechanical property performance are poorer, and the inoculant mainly lacks zirconium and niobium elements for improving the mechanical property of the casting.
Comparative example 3
A preparation method of an inoculant for nodular cast iron comprises the following steps:
weighing 140 parts of raw material No. 75 silicon iron, 5 parts of 30 silicon calcium, 7.5 parts of 30 rare earth silicon (the lanthanum/cerium ratio in rare earth is 30/70), 2.5 parts of 30 silicon barium, 2 parts of 35 silicon zirconium, 0.75 part of 70 niobium iron and 2 parts of scrap steel, putting into an electric furnace for heating and melting, controlling the melting temperature within the range of 1550-. The special-effect inoculant comprises the following components in percentage by mass: si: 72.14%, Ca: 1.3%, La/Ce: 1.96%, Al: 0.87%, Ba: 0.48%, Zr: 0.52%, Nb: 0.53%, S: 0.477%, O: 0.28%, Sb: 0.133%, the balance being iron.
The purity of the used raw materials, namely scrap steel, sulfur, iron black and antimony, is required to be more than 98.5 percent.
The specific inoculant prepared by the method is used for inoculation treatment of nodular cast iron of an oil cylinder with the wall thickness of 750mm under the same process conditions, and the obtained nodular cast iron part has the tensile strength of 373.5N/mm in detection2Yield strength of 278.35N/mm2The elongation was 12.79%. The comprehensive mechanical index of the casting is slightly improved compared with that of the casting inoculated by a normal inoculant, the mechanical property and the mechanical property are normal, the amount of the antimony element which is mainly combined with the rare earth element is insufficient, and the capability of the inoculant for improving the tensile strength of the nodular cast iron is slightly reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.
Claims (6)
1. The inoculant for the nodular cast iron is characterized by being prepared from the following raw materials in parts by weight: 150 parts of 75# ferrosilicon 130-one, 4-6 parts of 30# calcium silicon, 6-10 parts of 30# rare earth silicon, 1-3.5 parts of 30# barium silicon, 1-3 parts of 35# zirconium silicon, 0.5-1.0 part of 70# ferroniobium, 2-4 parts of scrap steel, 1-2.5 parts of sulfur, 0.45-0.85 part of iron black and 0.45-0.85 part of antimony;
the special-effect inoculant comprises the following components in percentage by mass: si: 68-75%, Ca: 0.7-1.5%, La/Ce: 1.5-2.1%, Al: 0.7-1.5%, Ba: 0.3-0.8%, Zr: 0.3-0.8%, Nb: 0.3-0.8%, S: 0.45-0.75%, O: 0.25 to 0.55%, Sb: 0.25-0.55%, and the balance of iron.
2. The inoculant for nodular cast iron as claimed in claim 1, wherein the specific inoculant comprises the following components in percentage by mass: si: 71.5%, Ca: 1.1%, La/Ce: 1.98%, Al: 0.89%, Ba: 0.47%, Zr: 0.43%, Nb: 0.51%, S: 0.46%, O: 0.31%, Sb: 0.36 percent, and the balance being iron.
3. The inoculant for nodular cast iron as claimed in claim 1, wherein the specific inoculant comprises the following components in percentage by mass: si: 73.3%, Ca: 1.21%, La/Ce: 1.78%, Al: 0.92%, Ba: 0.40%, Zr: 0.38%, Nb: 0.44%, S: 0.475%, O: 0.28%, Sb: 0.30% and the balance of iron.
4. The method for preparing the inoculant for spheroidal graphite cast iron as claimed in any one of claims 1 to 3, comprising the following steps:
the following raw materials in parts by weight: 150 parts of 75# ferrosilicon 130-plus, 4-6 parts of 30# calcium silicon, 6-10 parts of 30# rare earth silicon, 1-3.5 parts of 30# barium silicon, 1-3 parts of 35# zirconium silicon, 0.5-1.0 part of 70# ferroniobium and 2-4 parts of scrap steel are put into an electric furnace for heating and melting, and the melting temperature is controlled within the range of 1530-plus 1600 ℃;
after the raw materials are completely melted, 0.45-0.85 part of iron oxide black, 1-2.5 parts of sulfur and 0.45-0.85 part of antimony are added into the furnace, the mixture is continuously kept warm, stirred and smelted for 2-5min, and the mixture is poured into the furnace for casting and rapidly cooled to obtain the inoculant for the nodular cast iron.
5. The method for preparing the alloy steel according to claim 4, wherein the step of 'pouring casting and rapidly cooling' further comprises the following steps: cooling and crushing the mixture to the granularity of 0.1-0.9mm to obtain the inoculant for the nodular cast iron.
6. The method of claim 4, wherein the starting material: the purities of the scrap steel, the sulfur, the iron black and the antimony are more than 98.5 percent.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111500814A (en) * | 2020-05-15 | 2020-08-07 | 三祥新材股份有限公司 | Silicon-strontium alloy modifier and preparation method thereof |
| CN115418556A (en) * | 2022-08-25 | 2022-12-02 | 宁夏新顺成特种合金有限公司 | Inoculant for nodular cast iron and preparation method thereof |
| CN117888016A (en) * | 2023-12-13 | 2024-04-16 | 内蒙古圣泉科利源新材料科技有限公司 | Inoculant, preparation method and preparation device |
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| CN111500814A (en) * | 2020-05-15 | 2020-08-07 | 三祥新材股份有限公司 | Silicon-strontium alloy modifier and preparation method thereof |
| CN115418556A (en) * | 2022-08-25 | 2022-12-02 | 宁夏新顺成特种合金有限公司 | Inoculant for nodular cast iron and preparation method thereof |
| CN117888016A (en) * | 2023-12-13 | 2024-04-16 | 内蒙古圣泉科利源新材料科技有限公司 | Inoculant, preparation method and preparation device |
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