CN104451356A - High-nickel austenitic spheroidal graphite cast iron and preparation method thereof - Google Patents
High-nickel austenitic spheroidal graphite cast iron and preparation method thereof Download PDFInfo
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- CN104451356A CN104451356A CN201410663676.9A CN201410663676A CN104451356A CN 104451356 A CN104451356 A CN 104451356A CN 201410663676 A CN201410663676 A CN 201410663676A CN 104451356 A CN104451356 A CN 104451356A
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Abstract
The invention relates to the field of alloy cast iron and provides high-nickel austenitic spheroidal graphite cast iron and a preparation method thereof. The spheroidal graphite cast iron comprises the following chemical components in percentage by weight: 1.7-2.0% of C, 4.5-5.5% of Si, 34-36% of Ni, 0.5-1% of Mn, 1.5-2.5% of Cr and the balance of Fe. According to the high-nickel austenitic spheroidal graphite cast iron, the material formula is deeply researched, a unique nodularizing-inoculating technology is adopted, and the qualified chemical components and metallographic structures are simultaneously ensured, so that a casting with qualified mechanical properties can be stably obtained.
Description
Technical field
The present invention relates to alloy cast iron material field, be specifically related to a kind of high-nickel austenite nodular cast iron and preparation method thereof.
Background technology
The standard disunity that existing high-nickel austenite nodular cast iron exists, chemical composition ranges is too wide, also without the metallographic structure of this material of stably manufactured, is not suitable for steady in a long-term production; Containing a large amount of promotion carbide formers in chemical composition, as chromium, manganese etc., molten iron chilling tendency is very large, and molten iron flow is poor, and contracting is large, if art breading is improper, very easily acquisition fragility greatly, the tissue of carbide more than 30%, the underproof foundry goods of nodulizing grade.Therefore, need to find and a kind ofly can stablize the method obtaining qualified mechanical property foundry goods reliably.
Summary of the invention
The object of the present invention is to provide a kind of high-nickel austenite nodular cast iron and preparation method thereof, qualified Chemical Composition and metallographic structure can be ensured simultaneously, the stable foundry goods obtaining qualified mechanical property.
To achieve these goals, technical scheme of the present invention is:
Concrete, this spheroidal graphite cast iron contains following chemical components: C is 1.7% ~ 2.0%, Si be 4.5% ~ 5.5%, Ni be 34% ~ 36%, Mn be 0.5% ~ 1%, Cr is 1.5% ~ 2.5%, and surplus is Fe.
Concrete, the tensile strength > 430MPa of described spheroidal graphite cast iron, unit elongation > 13%, hardness 130 ~ 170HB; Austenite > 90%, perlite+bone shape dispersivity carbide < 10%, nodulizing grade 3 grades.
Preferably, the raw material quality proportioning of described spheroidal graphite cast iron is as follows: the pig iron 40% ~ 45%, steel scrap 10% ~ 15%, electrolysis pure nickel 35% ~ 36.5%, nickel Mg-Si nodularizer 0.8% ~ 1.2%; Ferrochrome 3% ~ 4%, silicomanganese zirconium nucleating agent 0.6% ~ 1.0%, silicon strontium nucleating agent: 0.1% ~ 0.3%, ferrosilicon 0.75% ~ 1.5%, ferromanganese 1.5% ~ 2.2%, carburelant 1.5% ~ 2.2%.
Concrete, electrolysis pure nickel contains Ni >=99.8%, containing C≤0.01%, containing Si≤0.04%, containing S≤0.02%, containing P≤0.05%.
Concrete, described silicomanganese zirconium nucleating agent is containing Zr 3 ~ 5%, and containing Si 55 ~ 65%, containing Mn 3 ~ 5%, all the other are Fe.
Concrete, described silicon strontium nucleating agent is containing Sr 0.5% ~ 1.0%, and containing Si 55% ~ 60%, all the other are Fe.
Concrete, described carburelant is the calcined petroleum coke carburelant of carbon containing >=95%.
A kind of high-nickel austenite nodular cast iron preparation method, described spheroidal graphite cast iron carries out melting, spheroidizing, preparation process by medium-frequency induction furnace in air ambient, described spheroidizing and preparation process as follows:
(1) spheroidizing: described spheroidizing adopts dam-type spheroidizing hot metal ladle, and 0.8% ~ 1.2% nickel Mg-Si nodularizer is embedded at the bottom of spheroidizing molten iron handbag, adopts and pours method pelletizing operations.
(2) preparation process: adopt 0.6% ~ 1.0% silicomanganese zirconium nucleating agent to carry out first time inoculation, make molten steel deoxidization degasification, and in conglobulation; The silicon strontium nucleating agent adding 0.1% ~ 0.3% carries out second time inoculation; Employing is poured method and is made nucleating agent in molten iron after even melting, and molten iron could be cast into foundry goods, molten steel pouring temperature ensures within 1390 ~ 1450 DEG C, terminates must control within 8 minutes to casting complete from spheroidizing.
The present invention is ensureing on the basis of the final carbon equivalent of molten iron between 4.6% ~ 4.7%, utilize exclusive spheroidization and inoculation technology, control nodulizing agent and nucleating agent consumption, teeming temperature, incubation time etc., make silicon, barium, strontium, zirconium multielement compound, keep effective inoculation effect, reduce the formation of molten iron chromium, manganese system carbide in process of setting, suppress the precipitation of carbide, make molten iron obtain after solidification organizing the globular graphite being not less than 3 grades, and obtain austenite more than 90%, the metallographic structure that perlite+bone shape carbide is less than 10%.The present invention can ensure qualified Chemical Composition and metallographic structure simultaneously, thus can obtain the foundry goods of qualified mechanical property.
Embodiment
Elaborate to the present invention below in conjunction with embodiment, but protection scope of the present invention is not limited in this, all those skilled in the art all fall into protection scope of the present invention with the replacement of spirit of the present invention to any equivalence that the present invention does.
Embodiment 1
The raw material quality proportioning of high-nickel austenite nodular cast iron is as follows: the pig iron 40%, steel scrap 15%, electrolysis pure nickel 35%, nickel Mg-Si nodularizer 0.8%; Ferrochrome 4%, silicomanganese zirconium nucleating agent 0.6%, silicon strontium nucleating agent 0.1%, ferrosilicon 1.5%, ferromanganese 1.5%, carburelant 1.5%.Electrolysis pure nickel contains Ni 99.91%, containing C 0.01%, containing Si 0.03%, containing S 0.01%, containing P 0.04%; Silicomanganese zirconium nucleating agent is containing Zr 3%, and containing Si 60%, containing Mn 5%, all the other are Fe; Silicon strontium nucleating agent is containing Sr 0.5%, and containing Si 60%, all the other are Fe.
A kind of high-nickel austenite nodular cast iron preparation method, comprises the following steps:
(1) melting: starting material are prepared burden according to above-mentioned quality proportioning, first carburelant, the pig iron, steel scrap are loaded in medium-frequency induction furnace, carry out removing the gred after being all melt into molten iron, skim, be incubated, spectroscopic compositional analyses, when molten iron temperature rises to 1450 DEG C, add electrolysis pure nickel, ferrosilicon, ferromanganese, ferrochrome.
(2) spheroidizing: spheroidizing adopts dam-type spheroidizing hot metal ladle, and 0.8% nickel Mg-Si nodularizer is embedded at the bottom of spheroidizing molten iron handbag, adopts and pours method pelletizing operations.
(3) preparation process: adopt 0.6% silicomanganese zirconium nucleating agent to carry out first time inoculation, make molten steel deoxidization degasification, and in conglobulation; The silicon strontium nucleating agent adding 0.1% carries out second time inoculation; Employing is poured method and is made nucleating agent in molten iron after even melting, and molten iron could be cast into foundry goods, molten steel pouring temperature ensures at 1390 DEG C, terminates to control at 7 minutes to casting complete from spheroidizing.
Record above-mentioned spheroidal graphite cast iron chemical composition content as follows: C is 1.7%, Si be 5.5%, Ni be 34%, Mn be 0.5%, Cr is 1.5%, and surplus is Fe.Mechanical property is as follows: tensile strength is 438MPa, and unit elongation is 14%, and hardness is 130HB; Austenite is 91%, and perlite+bone shape dispersivity carbide is 9.1%, nodulizing grade 3 grades.
Embodiment 2
The raw material quality proportioning of high-nickel austenite nodular cast iron is as follows: the pig iron 45%, steel scrap 10%, electrolysis pure nickel 35%, nickel Mg-Si nodularizer 1.2%; Ferrochrome 3%, silicomanganese zirconium nucleating agent 1.0%, silicon strontium nucleating agent 0.3%, ferrosilicon 0.75%, ferromanganese 2.2%, carburelant 1.55%.Electrolysis pure nickel contains Ni 99.8%, containing C 0.01%, containing Si 0.04%, containing S 0.02%, containing P 0.03%; Silicomanganese zirconium nucleating agent is containing Zr 4%, and containing Si 65%, containing Mn 3%, all the other are Fe; Silicon strontium nucleating agent is containing Sr 1.0%, and containing Si 55%, all the other are Fe.
A kind of high-nickel austenite nodular cast iron preparation method, comprises the following steps:
(1) melting: starting material are prepared burden according to above-mentioned quality proportioning, first carburelant, the pig iron, steel scrap are loaded in medium-frequency induction furnace, carry out removing the gred after being all melt into molten iron, skim, be incubated, spectroscopic compositional analyses, when molten iron temperature rises to 1450 DEG C, add electrolysis pure nickel, ferrosilicon, ferromanganese, ferrochrome.
(2) spheroidizing: described spheroidizing adopts dam-type spheroidizing hot metal ladle, and 1.2% nickel Mg-Si nodularizer is embedded at the bottom of spheroidizing molten iron handbag, adopts and pours method pelletizing operations.
(3) preparation process: adopt 0.8% silicomanganese zirconium nucleating agent to carry out first time inoculation, make molten steel deoxidization degasification, and in conglobulation; The silicon strontium nucleating agent adding 0.2% carries out second time inoculation; Employing is poured method and is made nucleating agent in molten iron after even melting, and molten iron could be cast into foundry goods, molten steel pouring temperature ensures at 1230 DEG C, terminates to control at 7.5 minutes to casting complete from spheroidizing.
Record above-mentioned spheroidal graphite cast iron chemical composition content as follows: C is 2.0%, Si be 5.0%, Ni be 36%, Mn be 1%, Cr is 2.0%, and surplus is Fe.Mechanical property is as follows: tensile strength is 441MPa, and unit elongation is 15%, and hardness is 147HB; Austenite is 94%, and perlite+bone shape dispersivity carbide is 9.3%, nodulizing grade 3 grades.
Embodiment 3
The raw material quality proportioning of high-nickel austenite nodular cast iron is as follows: the pig iron 42%, steel scrap 11.7%, electrolysis pure nickel 36.5%, nickel Mg-Si nodularizer 0.9%, ferrochrome 3.5%, silicomanganese zirconium nucleating agent 0.75%, silicon strontium nucleating agent 0.2%, ferrosilicon 0.75%, ferromanganese 1.5%, carburelant 2.2%.Electrolysis pure nickel contains Ni 99.86%, containing C 0.008%, containing Si 0.02%, containing S 0.012%, containing P 0.05%; Silicomanganese zirconium nucleating agent is containing Zr 5%, and containing Si 55%, containing Mn 4%, all the other are Fe; Silicon strontium nucleating agent is containing Sr 0.8%, and containing Si 57%, all the other are Fe.
A kind of high-nickel austenite nodular cast iron preparation method, comprises the following steps:
(1) melting: starting material are prepared burden according to above-mentioned quality proportioning, first carburelant, the pig iron, steel scrap are loaded in medium-frequency induction furnace, carry out removing the gred after being all melt into molten iron, skim, be incubated, spectroscopic compositional analyses, when molten iron temperature rises to 1450 DEG C, add electrolysis pure nickel, ferrosilicon, ferromanganese, ferrochrome.
(2) spheroidizing: described spheroidizing adopts dam-type spheroidizing hot metal ladle, and 1.0% nickel Mg-Si nodularizer is embedded at the bottom of spheroidizing molten iron handbag, adopts and pours method pelletizing operations.
(3) preparation process: adopt 1% silicomanganese zirconium nucleating agent to carry out first time inoculation, make molten steel deoxidization degasification, and in conglobulation; The silicon strontium nucleating agent adding 0.3% carries out second time inoculation; Employing is poured method and is made nucleating agent in molten iron after even melting, and molten iron could be cast into foundry goods, molten steel pouring temperature ensures at 1450 DEG C, terminates to control at 7 minutes to casting complete from spheroidizing.
Record above-mentioned spheroidal graphite cast iron chemical composition content as follows: C is 1.8%, Si be 4.5%, Ni be 35%, Mn be 0.8%, Cr is 2%, and surplus is Fe.Mechanical property is as follows: tensile strength 439MPa, unit elongation 16%, hardness 170HB; Austenite 93%, perlite+bone shape dispersivity carbide 8.7%, nodulizing grade 3 grades.
Claims (8)
1. a high-nickel austenite nodular cast iron, is characterized in that this spheroidal graphite cast iron contains following chemical components: C is 1.7% ~ 2.0%, Si be 4.5% ~ 5.5%, Ni be 34% ~ 36%, Mn be 0.5% ~ 1%, Cr is 1.5% ~ 2.5%, and surplus is Fe.
2. a kind of high-nickel austenite nodular cast iron according to claim 1, is characterized in that the tensile strength > 430MPa of described spheroidal graphite cast iron, unit elongation > 13%, hardness 130 ~ 170HB; Austenite > 90%, perlite+bone shape dispersivity carbide < 10%, nodulizing grade 3 grades.
3. a kind of high-nickel austenite nodular cast iron according to claim 1 or 2, it is characterized in that the raw material quality proportioning of described spheroidal graphite cast iron is as follows: the pig iron 40% ~ 45%, steel scrap 10% ~ 15%, electrolysis pure nickel 35% ~ 36.5%, nickel Mg-Si nodularizer 0.8% ~ 1.2%; Ferrochrome 3% ~ 4%, silicomanganese zirconium nucleating agent 0.6% ~ 1.0%, silicon strontium nucleating agent: 0.1% ~ 0.3%, ferrosilicon 0.75% ~ 1.5%, ferromanganese 1.5% ~ 2.2%, carburelant 1.5% ~ 2.2%.
4. a kind of high-nickel austenite nodular cast iron according to claim 3, is characterized in that described electrolysis pure nickel is containing Ni >=99.8%, containing C≤0.01%, containing Si≤0.04%, containing S≤0.02%, containing P≤0.05%.
5. a kind of high-nickel austenite nodular cast iron according to claim 3, it is characterized in that described silicomanganese zirconium nucleating agent is containing Zr 3 ~ 5%, containing Si 55 ~ 65%, containing Mn 3 ~ 5%, all the other are Fe.
6. a kind of high-nickel austenite nodular cast iron according to claim 3, it is characterized in that described silicon strontium nucleating agent is containing Sr0.5% ~ 1.0%, containing Si 55% ~ 60%, all the other are Fe.
7. a kind of high-nickel austenite nodular cast iron according to claim 3, is characterized in that described carburelant is the calcined petroleum coke carburelant of carbon containing >=95%.
8. a high-nickel austenite nodular cast iron preparation method, described spheroidal graphite cast iron carries out melting, spheroidizing, preparation process by medium-frequency induction furnace in air ambient, it is characterized in that described spheroidizing and preparation process as follows:
(1) spheroidizing: described spheroidizing adopts dam-type spheroidizing hot metal ladle, and 0.8 ~ 1.2% nickel Mg-Si nodularizer is embedded at the bottom of spheroidizing molten iron handbag, adopts and pours method pelletizing operations.
(2) preparation process: adopt 0.6 ~ 1.0% silicomanganese zirconium nucleating agent to carry out first time inoculation, make molten steel deoxidization degasification, and in conglobulation; The silicon strontium nucleating agent adding 0.1 ~ 0.3% carries out second time inoculation; Employing is poured method and is made nucleating agent in molten iron after even melting, and molten iron could be cast into foundry goods, molten steel pouring temperature ensures within 1390 ~ 1450 DEG C, terminates must control within 8 minutes to casting complete from spheroidizing.
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Cited By (5)
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| CN109482815A (en) * | 2018-12-21 | 2019-03-19 | 盐城市精工铸业股份有限公司 | The casting technique of high-nickel austenite nodular cast iron valve-stem nut |
| CN110160860A (en) * | 2018-04-11 | 2019-08-23 | 龙游县万基建设工程检测有限公司 | A kind of agravic universal testing machine based on polished rod calibration guiding |
| CN113699433A (en) * | 2021-09-07 | 2021-11-26 | 鹰普机械（宜兴）有限公司 | High-performance high-nickel austenitic ductile iron |
| CN114645185A (en) * | 2020-12-18 | 2022-06-21 | 中国科学院沈阳科学仪器股份有限公司 | Preparation method of corrosion-resistant and high-temperature-resistant high-nickel ductile iron |
| CN115747628A (en) * | 2022-11-17 | 2023-03-07 | 西安共晶金属科技有限公司 | Solid solution strengthened austenite matrix graphite steel profile and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160860A (en) * | 2018-04-11 | 2019-08-23 | 龙游县万基建设工程检测有限公司 | A kind of agravic universal testing machine based on polished rod calibration guiding |
| CN109482815A (en) * | 2018-12-21 | 2019-03-19 | 盐城市精工铸业股份有限公司 | The casting technique of high-nickel austenite nodular cast iron valve-stem nut |
| CN114645185A (en) * | 2020-12-18 | 2022-06-21 | 中国科学院沈阳科学仪器股份有限公司 | Preparation method of corrosion-resistant and high-temperature-resistant high-nickel ductile iron |
| CN113699433A (en) * | 2021-09-07 | 2021-11-26 | 鹰普机械（宜兴）有限公司 | High-performance high-nickel austenitic ductile iron |
| CN115747628A (en) * | 2022-11-17 | 2023-03-07 | 西安共晶金属科技有限公司 | Solid solution strengthened austenite matrix graphite steel profile and preparation method thereof |
| CN115747628B (en) * | 2022-11-17 | 2023-10-31 | 西安共晶金属科技有限公司 | Solid solution reinforced austenitic matrix graphite steel section bar and preparation method thereof |
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Application publication date: 20150325 |