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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- cast iron
- nickel
- nucleating agent
- spheroidizing
- spheroidal graphite
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 50
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims abstract description 6
- 239000002667 nucleating agent Substances 0.000 claims description 36
- 229910001566 austenite Inorganic materials 0.000 claims description 25
- 229910052742 iron Inorganic materials 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 16
- 229910052726 zirconium Inorganic materials 0.000 claims description 16
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 15
- MIDOFQRPAXDZET-UHFFFAOYSA-N [Si].[Sr] Chemical compound [Si].[Sr] MIDOFQRPAXDZET-UHFFFAOYSA-N 0.000 claims description 15
- 238000005868 electrolysis reaction Methods 0.000 claims description 13
- 238000011081 inoculation Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 229910019064 Mg-Si Inorganic materials 0.000 claims description 10
- 229910019406 Mg—Si Inorganic materials 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 8
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 8
- 229910000805 Pig iron Inorganic materials 0.000 claims description 8
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 210000000988 bone and bone Anatomy 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 239000010451 perlite Substances 0.000 claims description 6
- 235000019362 perlite Nutrition 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 238000007872 degassing Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000005453 pelletization Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002008 calcined petroleum coke Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 239000011651 chromium Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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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| 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 |
| CN116516241A (en) * | 2023-04-28 | 2023-08-01 | 无锡正杰机械科技有限公司 | A spheroidizing treatment process of high-nickel austenitic nodular cast iron and its application |
| CN116716446A (en) * | 2023-06-13 | 2023-09-08 | 西峡飞龙特种铸造有限公司 | A production control method for high-nickel austenitic ductile iron |
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Cited By (8)
| 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 |
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| 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 |
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| 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 |
| CN116516241A (en) * | 2023-04-28 | 2023-08-01 | 无锡正杰机械科技有限公司 | A spheroidizing treatment process of high-nickel austenitic nodular cast iron and its application |
| CN116716446A (en) * | 2023-06-13 | 2023-09-08 | 西峡飞龙特种铸造有限公司 | A production control method for high-nickel austenitic ductile iron |
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Application publication date: 20150325 |