CN111004965A - High-compression-resistance nodular cast iron pump body for fire fighting and preparation method thereof - Google Patents
High-compression-resistance nodular cast iron pump body for fire fighting and preparation method thereof Download PDFInfo
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- CN111004965A CN111004965A CN201911376009.1A CN201911376009A CN111004965A CN 111004965 A CN111004965 A CN 111004965A CN 201911376009 A CN201911376009 A CN 201911376009A CN 111004965 A CN111004965 A CN 111004965A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Y—GENERAL 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/20—Recycling
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Abstract
The invention discloses a high-pressure-resistance nodular cast iron pump body for fire fighting and a preparation method thereof, wherein the nodular cast iron pump body comprises the following chemical components in percentage by weight: c: 3.5-3.8%, Si: 2.5-2.8%, Mn: 0.3-0.5%, Cu: 0.1-0.3%, Re: 0.2-0.3%, Mg: 0.03-0.05%, Co: 0.01-0.02%, Sb: 0.005-0.01%, S: less than or equal to 0.35 percent, less than or equal to 0.05 percent of P, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: weighing raw materials according to the weight ratio, and smelting by using a medium-frequency induction furnace to obtain molten iron; and spheroidizing by adopting a wire feeder, combining three times of inoculation and pouring to obtain a casting. The high-compression-resistance fire-fighting nodular cast iron pump body prepared by the invention has excellent tensile strength, elongation and proper hardness, and high corrosion resistance, and can meet the requirement of long-term use.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a high-compression-resistance nodular cast iron pump body for fire fighting and a preparation method thereof.
Background
Along with the development of the building industry, the fire engineering is more and more emphasized, and the fire pump is used as an indispensable ring of the fire engineering and is widely applied to occasions such as houses, markets, factories and the like. The fire pump is mainly used for pressurizing and supplying water to a fire-fighting system pipeline, and a pump body of the fire pump is in a high-water-pressure working environment for a long time. In order to achieve the purpose of stable water delivery and prolong the service life of the fire pump body, the material for the fire pump body is required to have good mechanical properties and also has higher requirements on the corrosion resistance.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a high-pressure-resistance nodular cast iron pump body for fire fighting and a preparation method thereof.
The invention provides a high-pressure-resistance nodular cast iron pump body for fire fighting, which comprises the following chemical components in percentage by weight: c: 3.5-3.8%, Si: 2.5-2.8%, Mn: 0.3-0.5%, Cu: 0.1-0.3%, Re: 0.2-0.3%, Mg: 0.03-0.05%, Co: 0.01-0.02%, Sb: 0.005-0.01%, B: 0.003-0.005%, S: less than or equal to 0.35 percent, less than or equal to 0.05 percent of P, and the balance of Fe and inevitable impurities.
The preparation method of the high-pressure-resistance nodular cast iron pump body for fire fighting comprises the following steps:
s1, weighing pig iron, scrap steel and alloy furnace burden according to the weight ratio, and smelting by using a medium-frequency induction furnace to obtain molten iron;
s2, adding a first inoculant which is 0.4-0.6% of the weight of the molten iron in the step S1 into the molten iron bag, tapping the molten iron in the step S1, pouring the molten iron into the molten iron bag, and feeding a spheroidized core-spun yarn which is 0.6-1% of the weight of the molten iron in the step S1 into the molten iron bag by using a wire feeder to perform spheroidization;
s3, pouring the spheroidized iron liquid into a casting mold, adding a second inoculant which is 0.1-0.2% of the weight of the spheroidized iron liquid along with the flow during pouring to perform stream inoculation, uniformly adding a third inoculant which is 0.2-0.3% of the weight of the spheroidized iron liquid into the casting mold to perform in-mold inoculation, and cooling to obtain a casting.
Preferably, the first inoculant is a calcium-silicon inoculant with a particle size of 3-8 mm.
Preferably, the second inoculant consists of a silicon-zirconium inoculant and a silicon-bismuth inoculant and has a particle size of 0.2-0.8 mm.
Preferably, in the second inoculant, the weight ratio of the silicon-zirconium inoculant to the silicon-bismuth inoculant is (4-6): (6-14).
Preferably, the third inoculant is a ferrosilicon inoculant with a particle size of 1-2 mm.
Preferably, the spheroidized core-spun yarn is obtained by coating a rare earth magnesium spheroidizing agent by a steel strip.
Preferably, the rare earth magnesium nodulizer accounts for 65-80% of the total weight of the spheroidized core-spun yarn.
Preferably, the silicon-barium-calcium inoculant comprises the following chemical components in percentage by weight: si: 68-74%, Ba: 2.0-3.0%, Ca: 1.5-2.0%, Al: 1.5 percent and the balance of Fe.
Preferably, the silicon-zirconium inoculant comprises the following chemical components in percentage by weight: si: 65-72%, Ca: 1.0-2.0%, Al: 1.0-2.0%, Mn: 1.0-3.0%, Zr: 2.0-4.0 percent and the balance of Fe.
Preferably, the silicon bismuth inoculant comprises the following chemical components in percentage by weight: si: 70-75%, Al: 0.5-1.5%, Bi: 0.8-2%, Ca: 0.5-1% and the balance of Fe.
Preferably, the ferrosilicon inoculant comprises the following chemical components in percentage by weight: si: 75-80%, Mn: less than or equal to 0.4 percent, Cr: less than or equal to 0.3 percent, C: less than or equal to 0.1 percent, P: less than or equal to 0.035%, S: less than or equal to 0.02 percent and the balance of Fe.
Preferably, the rare earth magnesium nodulizer comprises the following chemical components in percentage by weight: re: 2.5-3.5%, Mg: 25-27%, Si: less than or equal to 48.0 percent, Mn: less than or equal to 4.0 percent, Ca: 2.0-3.0%, Al: less than or equal to 1.0 percent, Ti: less than or equal to 0.3 percent and the balance of Fe.
Preferably, in the step S2, the height-diameter ratio of the molten iron bag is 1 (5-6), and the wire feeding speed of the wire feeding machine is 15-20 m/min.
Preferably, the tapping temperature is 1500-1515 ℃, and the pouring temperature is 1400-1420 ℃.
A high-pressure-resistance nodular cast iron pump body for fire fighting is prepared by the preparation method.
The invention has the following beneficial effects:
in the raw materials of the invention, a small amount of Cu, Co, Sb and B are added, wherein Cu can promote graphitization, refine matrix structure, improve graphite morphology and improve corrosion resistance of the matrix; sb can reduce segregation, improve graphite morphology, increase the number of graphite spheres, obtain uniform and fine tissues and improve the plasticity of the material; b can form boron carbide, and the corrosion resistance of the matrix is improved; through the selection of the raw materials, the nodular cast iron material with uniform and good-form matrix structure can be obtained, and the nodular cast iron material has high strength, high toughness, excellent corrosion resistance and proper hardness.
In the preparation method of the material, a spheroidizing inoculation method combining wire feeding spheroidizing with tertiary inoculation is adopted, wherein an inoculant of silicon-barium-calcium is selected during inoculation in a first ladle, so that inoculation recession can be slowed down; when the secondary stream inoculation is carried out, the silicon-zirconium inoculant and the silicon-bismuth inoculant are selected and matched, so that the inoculation core can be kept in the molten iron for a long time, the number of graphite spheres is increased, and meanwhile, the impurities in the molten iron are reduced, so that the matrix structure is more uniform and fine; the third-time internal inoculation selects a ferrosilicon inoculant, so that the inoculation effect is further improved. Through the selection of the inoculants with different chemical components and the addition amount, inoculation recession can be effectively relieved, the spheroidizing inoculation effect is improved, the number of graphite balls can be greatly increased, and an even and compact matrix structure is formed, so that the mechanical property and the corrosion resistance of the material are effectively improved, and the requirement of long-term use of a fire-fighting pump body can be met.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
The silicon-barium-calcium inoculant used in the following examples and comparative examples comprises the following chemical components in percentage by weight: si: 68-74%, Ba: 2.0-3.0%, Ca: 1.5-2.0%, Al: 1.5 percent and the balance of Fe; the silicon-zirconium inoculant comprises the following chemical components in percentage by weight: si: 65-72%, Ca: 1.0-2.0%, Al: 1.0-2.0%, Mn: 1.0-3.0%, Zr: 2.0-4.0% and the balance of Fe; the silicon-bismuth inoculant comprises the following chemical components in percentage by weight: si: 70-75%, Al: 0.5-1.5%, Bi: 0.8-2%, Ca: 0.5-1% and the balance of Fe; the ferrosilicon inoculant comprises the following chemical components in percentage by weight: si: 75-80%, Mn: less than or equal to 0.4 percent, Cr: less than or equal to 0.3 percent, C: less than or equal to 0.1 percent, P: less than or equal to 0.035%, S: less than or equal to 0.02 percent, and the balance being Fe; the rare earth magnesium nodulizer comprises the following chemical components in percentage by weight: re: 2.5-3.5%, Mg: 25-27%, Si: less than or equal to 48.0 percent, Mn: less than or equal to 4.0 percent, Ca: 2.0-3.0%, Al: less than or equal to 1.0 percent, Ti: less than or equal to 0.3 percent and the balance of Fe.
Example 1
A high-pressure-resistance nodular cast iron pump body for fire fighting comprises the following chemical components in percentage by weight: c: 3.5%, Si: 2.5%, Mn: 0.3%, Cu: 0.1%, Re: 0.2%, Mg: 0.03%, Co: 0.01%, Sb: 0.005%, B: 0.003%, S: 0.1%, P: 0.03%, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps:
s1, weighing pig iron, scrap steel and alloy furnace burden according to the weight ratio, and smelting by using a medium-frequency induction furnace to obtain molten iron;
s2, adding a first inoculant which is 0.4 percent of the weight of the molten iron in the step S1 into the molten iron bag with the height-diameter ratio of 1:5, then discharging the molten iron in the step S1 at 1500 ℃, pouring the molten iron into the molten iron bag, feeding a spheroidized core-spun yarn which is 0.6 percent of the weight of the molten iron in the step S1 into the molten iron bag by using a yarn feeder for spheroidizing, wherein the yarn feeding speed of the yarn feeder is 15 m/min;
and S3, pouring the spheroidized iron liquid into a casting mold, wherein the pouring temperature is 1400 ℃, a second inoculant which is 0.1 percent of the weight of the spheroidized iron liquid is added along with the flow during pouring to perform stream inoculation, a third inoculant which is 0.2 percent of the weight of the spheroidized iron liquid is uniformly added into the casting mold to perform in-mold inoculation, and the casting is obtained after cooling.
Wherein the first inoculant is a silicon-barium-calcium inoculant with the granularity of 3-8 mm; the second inoculant is prepared from a silicon-zirconium inoculant and a silicon-bismuth inoculant in a weight ratio of 4: 6, the granularity of the material is 0.2-0.8 mm; the third inoculant is a ferrosilicon inoculant with the granularity of 1-2 mm; the spheroidized core-spun yarn is obtained by wrapping a rare earth magnesium spheroidizing agent by a steel strip, wherein the rare earth magnesium spheroidizing agent accounts for 65 percent of the total weight of the spheroidized core-spun yarn.
Example 2
A high-pressure-resistance nodular cast iron pump body for fire fighting comprises the following chemical components in percentage by weight: c: 3.8%, Si: 2.8%, Mn: 0.5%, Cu: 0.3%, Re: 0.3%, Mg: 0.05%, Co: 0.02%, Sb: 0.01%, B: 0.005%, S: 0.2%, P: 0.02%, the balance being Fe and unavoidable impurities;
the preparation method comprises the following steps:
s1, weighing pig iron, scrap steel and alloy furnace burden according to the weight ratio, and smelting by using a medium-frequency induction furnace to obtain molten iron;
s2, adding a first inoculant which is 0.6 percent of the weight of the molten iron in the step S1 into the molten iron bag with the height-diameter ratio of 1:6, then discharging the molten iron in the step S1 at 1515 ℃, pouring the molten iron into the molten iron bag, feeding spheroidized core-spun yarns which are 1 percent of the weight of the molten iron in the step S1 into the molten iron bag by using a wire feeding machine for spheroidization, wherein the wire feeding speed of the wire feeding machine is 20 m/min;
and S3, pouring the spheroidized iron liquid into a casting mold, wherein the pouring temperature is 1420 ℃, adding a second inoculant which is 0.2 percent of the weight of the spheroidized iron liquid along with the iron liquid during pouring to perform stream inoculation, uniformly adding a third inoculant which is 0.3 percent of the weight of the spheroidized iron liquid into the casting mold to perform in-mold inoculation, and cooling to obtain a casting.
Wherein the first inoculant is a silicon-barium-calcium inoculant with the granularity of 3-8 mm; the second inoculant is prepared from a silicon-zirconium inoculant and a silicon-bismuth inoculant in a weight ratio of 6: 14, the granularity of the material is 0.2-0.8 mm; the third inoculant is a ferrosilicon inoculant with the granularity of 1-2 mm; the spheroidized core-spun yarn is obtained by wrapping a rare earth magnesium spheroidizing agent by a steel belt, wherein the rare earth magnesium spheroidizing agent accounts for 80 percent of the total weight of the spheroidized core-spun yarn.
Example 3
A high-pressure-resistance nodular cast iron pump body for fire fighting comprises the following chemical components in percentage by weight: c: 3.6%, Si: 2.7%, Mn: 0.4%, Cu: 0.2%, Re: 0.25%, Mg: 0.04%, Co: 0.015%, Sb: 0.008%, B: 0.004%, S: 0.2%, P: 0.02%, the balance being Fe and unavoidable impurities;
the preparation method comprises the following steps:
s1, weighing pig iron, scrap steel and alloy furnace burden according to the weight ratio, and smelting by using a medium-frequency induction furnace to obtain molten iron;
s2, adding a first inoculant which is 0.5 percent of the weight of the molten iron in the step S1 into the molten iron bag with the height-diameter ratio of 1:6, then discharging the molten iron in the step S1 at 1510 ℃, pouring the molten iron into the molten iron bag, feeding a spheroidized core-spun yarn which is 0.8 percent of the weight of the molten iron in the step S1 into the molten iron bag by using a yarn feeder for spheroidizing, wherein the yarn feeding speed of the yarn feeder is 18 m/min;
and S3, pouring the spheroidized iron liquid into a casting mold, wherein the pouring temperature is 1410 ℃, adding a second inoculant which is 0.15 percent of the weight of the spheroidized iron liquid along with the flow during pouring to perform stream inoculation, uniformly adding a third inoculant which is 0.25 percent of the weight of the spheroidized iron liquid into the casting mold to perform in-mold inoculation, and cooling to obtain a casting.
Wherein the first inoculant is a silicon-barium-calcium inoculant with the granularity of 3-8 mm; the second inoculant is prepared from a silicon-zirconium inoculant and a silicon-bismuth inoculant in a weight ratio of 5: 15, the granularity of which is 0.2-0.8 mm; the third inoculant is a ferrosilicon inoculant with the granularity of 1-2 mm; the spheroidized core-spun yarn is obtained by wrapping a rare earth magnesium spheroidizing agent by a steel strip, wherein the rare earth magnesium spheroidizing agent accounts for 75 percent of the total weight of the spheroidized core-spun yarn.
Comparative example 1
The comparative example is the prior nodular cast iron pump body, and comprises the following chemical components in percentage by weight: c: 3.6%, Si: 2.7%, Mn: 0.4%, Re: 0.25%, Mg: 0.04%, S: 0.2%, P: 0.02%, the balance being Fe and unavoidable impurities:
the preparation method comprises the following steps:
s1, weighing pig iron, scrap steel and alloy furnace burden according to the weight ratio, and smelting by using a medium-frequency induction furnace to obtain molten iron;
s2, adding a rare earth magnesium nodulizer which is 0.6 percent of the weight of the molten iron in the step S1 into a molten iron ladle with the height-diameter ratio of 1:6, uniformly covering a ferrosilicon inoculant which is 0.9 percent of the weight of the molten iron in the step S1 on the surface of the rare earth magnesium nodulizer, discharging the molten iron in the step S1 at 1510 ℃, pouring into the molten iron ladle, and performing nodulizing and inoculating treatment;
and S3, pouring the spheroidized and inoculated molten iron into a casting mold at the pouring temperature of 1410 ℃, and cooling to obtain a casting.
Test examples
The ductile iron pump bodies prepared in examples 1 to 3 and comparative example 1 were subjected to a performance test in which the hardness test was in accordance with the standard of GB/T231.1 and the tensile test was in accordance with the standard of GB/T228, and the corrosion resistance test methods were as follows: A10X 10mm sample is taken, the corrosion medium is 3.5% by weight NaCl, the corrosion time is 30 days, the sample is completely immersed in the corrosion medium, the test is weighed before the start of the corrosion test and is recorded as W0After the corrosion test, the corrosive on the surface of the sample was removed, dried and weighed, and the weight was recorded as W. The corrosion rate calculation method comprises the following steps: r ═ W0W)/ST, where S is the total surface area of the sample and T is the test time. The test results are shown in table 1:
TABLE 1 nodular cast iron Pump body Performance test results
As can be seen from Table 1, the nodular cast iron pump body prepared by the method has proper hardness, the tensile strength and the elongation are both higher than national standards, and the nodular cast iron pump body has excellent corrosion resistance.
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 (9)
1. The high-pressure-resistance nodular cast iron pump body for fire fighting is characterized by comprising the following chemical components in percentage by weight: c: 3.5-3.8%, Si: 2.5-2.8%, Mn: 0.3-0.5%, Cu: 0.1-0.3%, Re: 0.2-0.3%, Mg: 0.03-0.05%, Co: 0.01-0.02%, Sb: 0.005-0.01%, B: 0.003-0.005%, S: less than or equal to 0.35 percent, less than or equal to 0.05 percent of P, and the balance of Fe and inevitable impurities.
2. The preparation method of the high pressure resistant fire-fighting nodular cast iron pump body as claimed in claim 1, characterized by comprising the following steps:
s1, weighing pig iron, scrap steel and alloy furnace burden according to the weight ratio, and smelting by using a medium-frequency induction furnace to obtain molten iron;
s2, adding a first inoculant which is 0.4-0.6% of the weight of the molten iron in the step S1 into the molten iron bag, tapping the molten iron in the step S1, pouring the molten iron into the molten iron bag, and feeding a spheroidized core-spun yarn which is 0.6-1% of the weight of the molten iron in the step S1 into the molten iron bag by using a wire feeder to perform spheroidization;
s3, pouring the spheroidized iron liquid into a casting mold, adding a second inoculant which is 0.1-0.2% of the weight of the spheroidized iron liquid along with the flow during pouring to perform stream inoculation, uniformly adding a third inoculant which is 0.2-0.3% of the weight of the spheroidized iron liquid into the casting mold to perform in-mold inoculation, and cooling to obtain a casting.
3. The method for preparing a high pressure resistant fire fighting nodular cast iron pump body according to claim 2, wherein the first inoculant is a silicon-barium-calcium inoculant with a particle size of 3-8 mm.
4. The method for preparing a high compression resistant nodular cast iron pump body for fire fighting as in claim 2 or 3, wherein the second inoculant consists of a silicon-zirconium inoculant and a silicon-bismuth inoculant and has a particle size of 0.2-0.8 mm.
5. The method for preparing the high compression resistant nodular cast iron pump body for fire fighting as claimed in any one of claims 2 to 4, wherein the weight ratio of the silicon-zirconium inoculant to the silicon-bismuth inoculant in the second inoculant is (4-6): (6-14).
6. The method for preparing a high compression resistant nodular cast iron pump body for fire fighting according to any one of claims 2 to 5, wherein the third inoculant is a ferrosilicon inoculant with a particle size of 1-2 mm.
7. The method for manufacturing the high compression resistant fire fighting nodular cast iron pump body according to any one of the claims 2 to 6, wherein the spheroidized core wire is obtained by coating a rare earth magnesium spheroidizing agent by a low carbon steel outer sheath, and the rare earth magnesium spheroidizing agent accounts for 65 to 80 percent of the total weight of the spheroidized core wire.
8. The method for manufacturing the high pressure resistant fire fighting nodular cast iron pump body according to any one of claims 2 to 7, wherein in the step S2, the height-diameter ratio of the molten iron bag is 1 (5-6), and the wire feeding speed of the wire feeding machine is 15-20 m/min.
9. The method for preparing a high compression-resistant nodular cast iron pump body for fire fighting as claimed in any one of claims 2 to 8, wherein the tapping temperature is 1500-.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114000043A (en) * | 2021-10-27 | 2022-02-01 | 襄阳金耐特机械股份有限公司 | High-ductility-toughness fatigue-resistant nodular cast iron and preparation method thereof |
| CN114058936A (en) * | 2021-10-22 | 2022-02-18 | 一汽解放汽车有限公司 | Nodular cast iron and preparation method thereof |
| CN114058938A (en) * | 2021-11-19 | 2022-02-18 | 襄阳金耐特机械股份有限公司 | Ductile cast iron with excellent low-temperature toughness and application thereof |
| CN114086053A (en) * | 2021-11-19 | 2022-02-25 | 襄阳金耐特机械股份有限公司 | Ductile cast iron member having excellent low-temperature toughness and method for producing same |
| WO2022129612A1 (en) * | 2020-12-17 | 2022-06-23 | Foseco International Limited | Process for treating molten iron |
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| CN101805868A (en) * | 2009-02-16 | 2010-08-18 | 中国科学院金属研究所 | Method for smelting thin-wall ductile iron gearbox |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022129612A1 (en) * | 2020-12-17 | 2022-06-23 | Foseco International Limited | Process for treating molten iron |
| CN114058936A (en) * | 2021-10-22 | 2022-02-18 | 一汽解放汽车有限公司 | Nodular cast iron and preparation method thereof |
| CN114000043A (en) * | 2021-10-27 | 2022-02-01 | 襄阳金耐特机械股份有限公司 | High-ductility-toughness fatigue-resistant nodular cast iron and preparation method thereof |
| CN114000043B (en) * | 2021-10-27 | 2023-12-01 | 襄阳金耐特机械股份有限公司 | Ductile cast iron with high plastic toughness and fatigue resistance and manufacturing method thereof |
| CN114058938A (en) * | 2021-11-19 | 2022-02-18 | 襄阳金耐特机械股份有限公司 | Ductile cast iron with excellent low-temperature toughness and application thereof |
| CN114086053A (en) * | 2021-11-19 | 2022-02-25 | 襄阳金耐特机械股份有限公司 | Ductile cast iron member having excellent low-temperature toughness and method for producing same |
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