CN108193125B - TGC600 nodular cast iron and preparation method thereof - Google Patents

TGC600 nodular cast iron and preparation method thereof Download PDF

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CN108193125B
CN108193125B CN201810224089.8A CN201810224089A CN108193125B CN 108193125 B CN108193125 B CN 108193125B CN 201810224089 A CN201810224089 A CN 201810224089A CN 108193125 B CN108193125 B CN 108193125B
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cast iron
nodular cast
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iron
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CN108193125A (en
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武元蛟
邢欣欣
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Hebei Shuokai Casting Co ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/04Cast-iron alloys containing spheroidal graphite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D5/00Heat treatments of cast-iron
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/08Making cast-iron alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/10Cast-iron alloys containing aluminium or silicon
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention provides TGC600 nodular cast iron which is characterized by comprising the following components in parts by weight: 34-38 parts of carbon, 20-24 parts of silicon, 5-6 parts of manganese, 0.1-0.6 part of phosphorus, 0.1-0.2 part of sulfur, 3-4 parts of molybdenum, 5-6 parts of copper, 3-4 parts of nickel, 0.4-0.6 part of magnesium, 0.3-0.4 part of tin and the balance of Fe. The preparation method comprises the following steps: a. smelting b, tapping and spheroidizing c, and pouring d to obtain the nodular cast iron. The TGC600 nodular cast iron prepared by the method can ensure that the pearlite content of the core can reach more than 80% when the casting exceeds 6 tons, and ensure that the hardness of the casting is more than 50HRC after quenching.

Description

TGC600 nodular cast iron and preparation method thereof
Technical Field
The invention relates to the technical field of metal materials, in particular to TGC600 nodular cast iron and a preparation method thereof.
Background
The TGC600 nodular cast iron is a Japanese nodular cast iron material, belongs to alloy nodular cast iron, and is characterized in that on the basis of the original nodular cast iron production process, alloy elements such as Mo, Ni and Cu are added to promote pearlite transformation and improve the hardenability and hardenability of castings, so that the TGC600 nodular cast iron is mainly used for producing the castings in the drawing process of automobile panels. However, in the actual production process, according to the existing alloy adding proportion, the casting with the pearlite content of more than 6 tons often has the standard requirement that the pearlite content of the body is lower than 80 percent, the hardness of the casting after quenching is lower than 50HRC, and the product is scrapped when the hardness is serious.
Disclosure of Invention
In view of the above, the invention aims to provide TGC600 nodular cast iron and a preparation method thereof, so as to ensure that the pearlite content of a core can reach more than 80% when a casting exceeds 6 tons, and the hardness of the casting after quenching is more than 50 HRC.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the TGC600 nodular cast iron comprises the following components in parts by weight: 34-38 parts of carbon, 20-24 parts of silicon, 5-6 parts of manganese, 0.1-0.6 part of phosphorus, 0.1-0.2 part of sulfur, 3-4 parts of molybdenum, 5-6 parts of copper, 3-4 parts of nickel, 0.4-0.6 part of magnesium, 0.3-0.4 part of tin and the balance of Fe, wherein the total amount is 1000 parts.
Further, the composition and the parts by weight are as follows: 34.2-37.5 parts of carbon, 20-22 parts of silicon, 5.5-6 parts of manganese, 0.1-0.6 part of phosphorus, 0.1-0.2 part of sulfur, 3-3.6 parts of molybdenum, 5.3-6 parts of copper, 3-3.7 parts of nickel, 0.45-0.6 part of magnesium, 0.33-0.4 part of tin and the balance of Fe, wherein the total amount is 1000 parts.
Further, the composition and the parts by weight are as follows: 36.7 parts of carbon, 21.9 parts of silicon, 5.9 parts of manganese, 0.25 part of phosphorus, 0.1 part of sulfur, 3.5 parts of molybdenum, 5.5 parts of copper, 3.6 parts of nickel, 0.6 part of magnesium, 0.4 part of tin and the balance of Fe, wherein the total amount is 1000 parts.
Further, the preparation method of the TGC600 nodular cast iron comprises the following steps:
a. smelting: preparing raw materials, raising the temperature to 1400-1500 ℃ for smelting, sampling, performing spectrum detection, adding nickel, copper, tin and the like according to the detection result according to the standard, finally sampling, performing secondary spectrum detection, and raising the temperature to 1520-1530 ℃ after the detection meets the requirements;
b. tapping and spheroidizing: pouring molten iron obtained by smelting into a casting ladle, and simultaneously carrying out spheroidizing inoculation;
c. pouring: after tapping, casting and molding the molten iron according to requirements;
d. obtaining the nodular cast iron: and after the pouring is finished, cooling the casting in a sand mold to below 300 ℃, and then sequentially carrying out sand falling, separation, shot blasting and heat treatment to obtain the nodular cast iron material.
Further, the smelting temperature in the step a is 1400 ℃.
Further, the raw materials in the step a comprise pig iron, scrap steel, foundry returns, carburant, silicon carbide, ferromolybdenum and ferromanganese.
Further, the pig iron, the scrap steel and the foundry returns comprise the following components in parts by weight: 10-30: 40-60: 15 to 25.
Further, the heat treatment in the step d is to heat the nodular cast iron to 560-650 ℃, preserve heat for 3-5 hours, slowly cool the nodular cast iron to 190-240 ℃ along with the furnace, and finally take out the nodular cast iron and place the nodular cast iron in air to cool the nodular cast iron to normal temperature.
Compared with the prior art, the invention has the following advantages:
(1) the TGC600 nodular cast iron has the following chemical components: c is a basic element of nodular cast iron, the graphitization is facilitated due to the high C content, but the graphite floating is easily generated due to the overhigh carbon content, the mechanical property of the casting is reduced, and therefore the C content is 3.4-3.8%. Si is a strong graphitizing element, Si not only can effectively reduce the chilling tendency and increase the ferrite amount, but also has the functions of refining eutectic clusters and improving the roundness of graphite nodules, and simultaneously, Si improves the ductile-brittle transition temperature of cast iron and reduces the impact toughness, so that the Si content is 2.0-2.4%. S is a reverse spheroidizing element, has strong affinity with spheroidizing elements such as Mg, rare earth and the like, and can consume a large amount of spheroidizing elements in molten iron to form sulfides of Mg and rare earth, thereby causing defects such as slag inclusion, pores and the like, and the content of S is 0.01-0.02%. The main function of Mn is to increase the pearlite content and also to increase the ductile-brittle transition temperature of the nodular cast iron, so that the Mn content is 0.5-0.6%. P is a harmful element, and is easy to segregate at the eutectic cell boundary when the content is too high, so that binary, ternary or composite phosphorus eutectic is formed, the toughness of the cast iron is reduced, and the content of P in the nodular cast iron is 0.01-0.06%. Mg can promote graphite to be precipitated in a spherical shape, the influence of S on ductile iron is eliminated, Mg element and S element can generate MgS, and redundant S element in molten iron can be removed, so that the content of Mg is 0.04-0.06%. Cu is one of the most common alloy elements of nodular cast iron, and can improve the strength of an analytical instrument of the nodular cast iron in most cases, and meanwhile, the tensile strength of the nodular cast iron can be obviously improved, so that the Cu content is 0.5-0.6%. Both Ni and Mo are trace elements, Mo can refine pearlite, and Ni can increase the area of pearlite. Therefore, the content of Ni and Mo is 0.3-0.4%. Sn has the function of strongly promoting pearlite transformation, and the amount of pearlite is an important influence factor of martensite transformation in the quenching process of a casting to promote the pearlite transformation, so that the content of Sn is 0.03-0.04%.
(2) The nodular cast iron obtained by the heat treatment process in the preparation process of the TGC600 nodular cast iron has uniform tissue distribution, is beneficial to improving the mechanical property of the nodular cast iron, has the hardness of more than HRC50, and has higher strength and safer use. The preparation method does not need desulfurization treatment, has less working procedures, can greatly reduce the cost of raw materials, and has greater social and economic benefits when being popularized and applied.
In conclusion, the composition and the proportion of various chemical components in the TGC600 nodular cast iron can ensure that the pearlite content in the core part can reach more than 80 percent when the casting is over 6 tons, thereby ensuring that the hardness of the casting is more than 50HRC after quenching, and reducing the product rejection phenomenon caused by low quenching hardness of the TGC600 nodular cast iron.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic representation of a pre-modified TGC600 ductile iron according to an embodiment of the present invention;
FIG. 2 is a schematic representation of a modified TGC600 ductile iron according to an embodiment of the present invention;
Detailed Description
The technical scheme in the embodiment of the invention will be clarified by combining the attached drawings in the embodiment of the invention
Clearly, the embodiments described are only a few embodiments of the present invention, not all embodiments, which are obvious from the full description. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Example 1:
the TGC600 nodular cast iron comprises the following components in parts by weight: 36.7 parts of carbon, 21.9 parts of silicon, 5.9 parts of manganese, 0.25 part of phosphorus, 0.1 part of sulfur, 3.5 parts of molybdenum, 5.5 parts of copper, 3.6 parts of nickel, 0.6 part of magnesium, 0.4 part of tin and 921.55 parts of iron.
The preparation method of the TGC600 nodular cast iron comprises the following steps:
a. smelting: adding pig iron, scrap steel and foundry returns into a medium-frequency electric furnace according to the proportion of 1:4:2, heating, adding a carburant, silicon carbide, ferromolybdenum and ferromanganese, heating to 1400 ℃, sampling, carrying out spectrum detection, adding nickel, copper, tin and the like according to the detection result according to the standard, finally sampling, carrying out secondary spectrum detection, and heating to 1520 ℃ after the detection meets the requirement;
b. tapping and spheroidizing: pouring molten iron obtained by smelting into a casting ladle, and simultaneously carrying out spheroidizing inoculation;
c. pouring: after tapping, casting and molding the molten iron according to requirements;
d. obtaining the nodular cast iron: after the pouring is finished, the casting is cooled to 300 ℃ in a sand mold, the sand falling, the separation and the shot blasting are sequentially carried out, then the nodular cast iron is heated to 575 ℃, the temperature is kept for 3 hours, the nodular cast iron is slowly cooled to 200 ℃ along with the furnace, and finally the nodular cast iron is taken out and placed in the air to be cooled to the normal temperature. 6 tons of nodular cast iron materials are obtained, the pearlite content and the hardness after quenching of the TGC600 nodular cast iron are measured, and the experimental results are shown in Table 1.
Example 2:
the TGC600 nodular cast iron comprises the following components in parts by weight: 36.2 parts of carbon, 20.9 parts of silicon, 5.9 parts of manganese, 0.25 part of phosphorus, 0.2 part of sulfur, 3.4 parts of molybdenum, 5.3 parts of copper, 3.8 parts of nickel, 0.58 part of magnesium, 0.38 part of tin and 923.09 parts of iron.
The preparation method of the TGC600 nodular cast iron comprises the following steps:
a. smelting: adding pig iron, scrap steel and foundry returns into a medium-frequency electric furnace according to the proportion of 2.2:9:4, heating, adding a carburant, silicon carbide, ferromolybdenum and ferromanganese, heating to 1400 ℃, sampling, carrying out spectrum detection, adding nickel, copper, tin and the like according to the detection result according to the standard, finally sampling, carrying out secondary spectrum detection, and heating to 1525 ℃ after the detection meets the requirement;
b. tapping and spheroidizing: pouring molten iron obtained by smelting into a casting ladle, and simultaneously carrying out spheroidizing inoculation;
c. pouring: after tapping, casting and molding the molten iron according to requirements;
d. obtaining the nodular cast iron: after the pouring is finished, the casting is cooled to 300 ℃ in a sand mold, the sand falling, the separation and the shot blasting are sequentially carried out, then the nodular cast iron is heated to 580 ℃, the temperature is kept for 3 hours, the nodular cast iron is slowly cooled to 210 ℃ along with a furnace, and finally the nodular cast iron is taken out and placed in air to be cooled to the normal temperature. 10 tons of nodular cast iron materials are obtained, the pearlite content and the hardness after quenching of the TGC600 nodular cast iron are measured, and the experimental results are shown in Table 1.
Example 3:
the TGC600 nodular cast iron comprises the following components in parts by weight: 36.4 parts of carbon, 21.1 parts of silicon, 5.8 parts of manganese, 0.3 part of phosphorus, 0.13 part of sulfur, 3.2 parts of molybdenum, 5.6 parts of copper, 3.9 parts of nickel, 0.6 part of magnesium, 0.4 part of tin and 922.57 parts of iron.
The preparation method of the TGC600 nodular cast iron comprises the following steps:
a. smelting: adding pig iron, scrap steel and foundry returns into a medium-frequency electric furnace according to the proportion of 1:5:2, heating, adding a carburant, silicon carbide, ferromolybdenum and ferromanganese, heating to 1400 ℃, sampling, carrying out spectrum detection, adding nickel, copper, tin and the like according to the detection result according to the standard, finally sampling, carrying out secondary spectrum detection, and heating to 1525 ℃ after the detection meets the requirement;
b. tapping and spheroidizing: pouring molten iron obtained by smelting into a casting ladle, and simultaneously carrying out spheroidizing inoculation;
c. pouring: after tapping, casting and molding the molten iron according to requirements;
d. obtaining the nodular cast iron: after the pouring is finished, the casting is cooled to 296 ℃ in a sand mold, then the sand falling, the separation and the shot blasting are sequentially carried out, then the nodular cast iron is heated to 580 ℃, the temperature is kept for 4 hours, the nodular cast iron is slowly cooled to 210 ℃ along with a furnace, and finally the nodular cast iron is taken out and placed in air to be cooled to the normal temperature. 18 tons of nodular cast iron materials are obtained, the pearlite content and the hardness after quenching of the TGC600 nodular cast iron are measured, and the experimental results are shown in Table 1.
Example 4:
the TGC600 nodular cast iron comprises the following components in parts by weight: 37.1 parts of carbon, 21.3 parts of silicon, 6 parts of manganese, 0.32 part of phosphorus, 0.15 part of sulfur, 3.6 parts of molybdenum, 5.85 parts of copper, 3.7 parts of nickel, 0.57 part of magnesium, 0.39 part of tin and 921.02 parts of iron.
The preparation method of the TGC600 nodular cast iron comprises the following steps:
a. smelting: adding pig iron, scrap steel and foundry returns into a medium-frequency electric furnace according to the proportion of 3:9:4, heating, adding a carburant, silicon carbide, ferromolybdenum and ferromanganese, heating to 1400 ℃, sampling, carrying out spectrum detection, adding nickel, copper, tin and the like according to the detection result according to the standard, finally sampling, carrying out secondary spectrum detection, and heating to 1530 ℃ after the detection meets the requirement;
b. tapping and spheroidizing: pouring molten iron obtained by smelting into a casting ladle, and simultaneously carrying out spheroidizing inoculation;
c. pouring: after tapping, casting and molding the molten iron according to requirements;
d. obtaining the nodular cast iron: after the pouring is finished, the casting is cooled to 295 ℃ in a sand mold, then the sand falling, separation and shot blasting are sequentially carried out, then the nodular cast iron is heated to 620 ℃, the temperature is kept for 5 hours, the nodular cast iron is slowly cooled to 200 ℃ along with a furnace, and finally the nodular cast iron is taken out and placed in air to be cooled to the normal temperature. Finally, 26 tons of nodular cast iron materials are obtained, the pearlite content and the hardness after quenching of the TGC600 nodular cast iron are measured, and the experimental results are shown in Table 1.
TABLE 1
Figure 246670DEST_PATH_IMAGE002
By combining the data analysis, when the improved TGC600 nodular cast iron material exceeds 6 tons, the pearlite content of the core can reach more than 80 percent, and the hardness of the casting after quenching is ensured to be more than 50 HRC.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The TGC600 nodular cast iron is characterized by comprising the following components in parts by weight: 34-38 parts of carbon, 20-24 parts of silicon, 5-6 parts of manganese, 0.1-0.6 part of phosphorus, 0.1-0.2 part of sulfur, 3-4 parts of molybdenum, 5-6 parts of copper, 3-4 parts of nickel, 0.4-0.6 part of magnesium, 0.3-0.4 part of tin and the balance of Fe, wherein the total amount is 1000 parts;
the preparation method of the TGC600 nodular cast iron comprises the following steps:
a. smelting: preparing raw materials, raising the temperature to 1400-1500 ℃ for smelting, sampling, performing spectrum detection, adding nickel, copper and tin according to the detection result according to the standard, finally sampling, performing secondary spectrum detection, and raising the temperature to 1520-1530 ℃ after the detection meets the requirements;
b. tapping and spheroidizing: pouring molten iron obtained by smelting into a casting ladle, and simultaneously carrying out spheroidizing inoculation;
c. pouring: after tapping, casting and molding the molten iron according to requirements;
d. obtaining the nodular cast iron: after the pouring is finished, cooling the casting in a sand mold to below 300 ℃, and then sequentially carrying out sand falling, separation, shot blasting and heat treatment to obtain the nodular cast iron material;
the heat treatment in the step d is to heat the nodular cast iron to 560-650 ℃, preserve heat for 3-5 hours, slowly cool the nodular cast iron to 190-240 ℃ along with the furnace, and finally take out the nodular cast iron and place the nodular cast iron in the air to cool the nodular cast iron to the normal temperature.
2. The TGC600 spheroidal graphite cast iron according to claim 1, characterized by comprising, in parts by weight: 34.2-37.5 parts of carbon, 20-22 parts of silicon, 5.5-6 parts of manganese, 0.1-0.6 part of phosphorus, 0.1-0.2 part of sulfur, 3-3.6 parts of molybdenum, 5.3-6 parts of copper, 3.2-3.9 parts of nickel, 0.45-0.6 part of magnesium, 0.33-0.4 part of tin and the balance of Fe, wherein the total amount is 1000 parts.
3. The TGC600 nodular cast iron of claim 2, wherein the composition and parts by weight thereof are: 36.7 parts of carbon, 21.9 parts of silicon, 5.9 parts of manganese, 0.25 part of phosphorus, 0.1 part of sulfur, 3.5 parts of molybdenum, 5.5 parts of copper, 3.6 parts of nickel, 0.6 part of magnesium, 0.4 part of tin and 921.55 parts of iron.
4. The method of preparation of TGC600 spheroidal graphite cast iron according to claim 1, characterized in that it comprises the following steps:
a. smelting: preparing raw materials, raising the temperature to 1400-1500 ℃ for smelting, sampling, performing spectrum detection, adding nickel, copper and tin according to the detection result according to the standard, finally sampling, performing secondary spectrum detection, and raising the temperature to 1520-1530 ℃ after the detection meets the requirements;
b. tapping and spheroidizing: pouring molten iron obtained by smelting into a casting ladle, and simultaneously carrying out spheroidizing inoculation;
c. pouring: after tapping, casting and molding the molten iron according to requirements;
d. obtaining the nodular cast iron: and after the pouring is finished, cooling the casting in a sand mold to below 300 ℃, and then sequentially carrying out sand falling, separation, shot blasting and heat treatment to obtain the nodular cast iron material.
5. The method of preparation of TGC600 spheroidal graphite cast iron according to claim 4, characterized in that: the melting temperature in step a is 1400 ℃.
6. The method of preparation of TGC600 spheroidal graphite cast iron according to claim 4, characterized in that: in the step a, the raw materials comprise pig iron, scrap steel, foundry returns, carburant, silicon carbide, ferromolybdenum and ferromanganese.
7. The preparation method of TGC600 nodular cast iron according to claim 6 wherein the weight parts of pig iron, scrap steel and scrap returns are: 10-30: 40-60: 15 to 25.
8. The method of preparation of TGC600 spheroidal graphite cast iron according to claim 4, characterized in that: the heat treatment in the step d is to heat the nodular cast iron to 560-650 ℃, preserve heat for 3-5 hours, slowly cool the nodular cast iron to 190-240 ℃ along with the furnace, and finally take out the nodular cast iron and place the nodular cast iron in the air to cool the nodular cast iron to the normal temperature.
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