CN102851571A - Low-temperature-resistant and high-toughness nodular cast iron and preparation method thereof - Google Patents
Low-temperature-resistant and high-toughness nodular cast iron and preparation method thereof Download PDFInfo
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- CN102851571A CN102851571A CN2012102916598A CN201210291659A CN102851571A CN 102851571 A CN102851571 A CN 102851571A CN 2012102916598 A CN2012102916598 A CN 2012102916598A CN 201210291659 A CN201210291659 A CN 201210291659A CN 102851571 A CN102851571 A CN 102851571A
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Abstract
The invention relates to low-temperature-resistant and high-toughness nodular cast iron which contains the following chemical elements in percentage by weight: 3.3-3.5% of carbon, 2.2-2.5% of silicon, less than 0.3% of manganese, less than 0.03% of phosphorus, less than 0.01% of sulfur, 0.6-0.9% of nickel, 0.005-0.01% of bismuth and the balance of iron. The preparation method of the nodular cast iron comprises the following procedures: a proportioning procedure: respectively weighing Z14 pig iron, scrap steel, QT scrap returns, nickel ingots, bismuth ingots, inoculant and nodulizer; a smelting procedure: sequentially smelting the Z14 pig iron, the scrap steel, the QT scrap returns, the nickel ingots and the bismuth ingots to prepare an iron solution containing qualified chemical components; and an inoculation and nodularization procedure: adding the inoculant and the nodulizer which are weighed in the proportioning procedure, and then pouring the iron solution prepared in the smelting procedure to finish the nodularization process. The nodular cast iron prepared by the method is resistant to low temperature and high in toughness and has fine service performance; the preparation process is simple and convenient to operate; and the scrap steel is used for preparation, thereby saving the cost.
Description
Technical field
The invention belongs to field of metallurgy, relate in particular to a kind of cast iron and preparation method thereof.
Background technology
Low-temperature high-toughness spheroidal graphite cast iron is because of its special use properties, day by day become the visual plant vitals such as domestic extremely frigid zones machine, such as wheel box, wheel hub, base, railway and the subway accessory of wind-powered electricity generation, locomotive and vehicle body fittings, oil and chemical pipeline accessory etc.Although low-temperature high-toughness spheroidal graphite cast iron material product is of many uses at extremely frigid zones, but metal connection pipe fitting and tube fittings product thereof are because leakproof is had relatively high expectations, the body wall thickness is thinner, melting technology is numerous and diverse, in the native land pipe fitting manufacturing enterprise seldom with the product application of low-temperature high-toughness spheroidal graphite cast iron material in the pipe fitting products production, also cause thus the critical shortage of domestic this series products and overall technology to fall behind.
Summary of the invention
The purpose of this invention is to provide spheroidal graphite cast iron that uses under a kind of low temperature and preparation method thereof, technical problem to be solved is so that spheroidal graphite cast iron also keeps preferably use properties under the low temperature working conditions.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of low-temperature-resistance high-toughness spheroidal graphite cast iron that the present invention proposes, contain the chemical element of following weight percent, carbon 3.3% ~ 3.5%, silicon 2.2% ~ 2.5%, manganese＜0.3%, phosphorus＜0.03%, sulphur＜0.01%, nickel 0.6% ~ 0.9%, bismuth 0.005% ~ 0.01%, surplus is iron.
The preparation method of aforementioned low-temperature-resistance high-toughness spheroidal graphite cast iron comprises the steps:
Burden process: take by weighing respectively the Z14 pig iron 50%, steel scrap 15%, QT foundry returns 35%, nickel ingot 0.85%, bismuth ingot 0.008%, nucleating agent (No. 75 ferrosilicon) 0.7%, nodulizing agent (rare earth magnesium ferrosilicon alloy) 1.2%.
The melting operation: the present invention adopts the main frequency furnace melting, in order to improve melting efficiency, the Z14 pig iron 10% on furnace bottom is first auxiliary, promote the fusing of iron charge with the iron liquid of as early as possible acquisition melting, in electric furnace, add successively from the bottom up again 40% of Z14 pig iron total amount, 30% of QT foundry returns total amount, with the small power blow-on, after 5 minutes furnace power is risen to 90%, furnace charge begins fusing, in melting, constantly adds by furnace charge the remaining Z14 pig iron, the QT foundry returns, steel scrap, add total amount 90% nickel ingot and 90% bismuth ingot after the furnace charge fusing, after furnace charge to be configured all melted, chemical composition analysis was carried out in sampling, remain 10% nickel ingot and bismuth ingot according to analytical results, then be warming up to 1500～1530 ℃ of temperature, for improving the low-temperature high-toughness performance of foundry goods, in smelting iron liquid process, add nickel ingot 0.85%, bismuth ingot 0.008%, after chemical composition analysis is qualified, molten iron is come out of the stove, and described nickel ingot is nickeliferous 99%, bismuth ingot bismuth-containing 99%.
Breed, the nodularization operation: the prerequisite that super low-temperature resistant high tenacity thin-wall metal connection pipe fitting has superperformance is that nodularization and inoculation are proper.Can allow the existence form of the carbon in the cast iron pipe fittings be spherical by spheroidizing, can create more graphite crystallization core, the eutectic cell number is increased, tiny and even distribution, thus improve mechanical property.
A side of dykes and dams adds 0.7% nucleating agent (the nucleating agent granular size is between 8 ~ 20mm), 1.2% nodulizing agent (the nodulizing agent granular size is 5 ~ 20mm), and evenly sprinkles 2～5mm perlite in the casting ladle.Pour first the iron liquid of gross weight 70%, after spheroidizing reacion finishes, pour all the other iron liquid again, left standstill 1 ~ 2 minute, the graphite of cast iron and matrix refinement improve cast iron intensity.The result that stokehold cast chill block detects nodularization and breeds, qualified rear is pourable.
Aforesaid nucleating agent is rare earth, silicon, strontium, bismuth matrix material, contains following weight percent material, rare earth: 5-10%, silicon: 55-65%, strontium: 0.5-1%; Barium: 0.2-0.5%, surplus is iron.
Aforesaid nodulizing agent contains following weight percent material, magnesium: 4-5%, and rare earth: 8-10%, silicon: 45-55%, surplus is iron.
By technique scheme, a kind of low-temperature-resistance high-toughness spheroidal graphite cast iron of the present invention and preparation method thereof has following advantages at least:
Adopt the spheroidal graphite cast iron of the inventive method preparation low temperature resistant, toughness is high, and use properties is good, and preparation technology is simple, and is easy to operate, utilizes the steel scrap preparation, saves cost.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technique means of the present invention, and can be implemented according to the content of specification sheets, below is described in detail as follows with preferred embodiment of the present invention.
Embodiment
Reach technique means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, low-temperature-resistance high-toughness spheroidal graphite cast iron that foundation the present invention is proposed and preparation method thereof its embodiment, feature and effect thereof are described in detail as follows.
The used pig iron weight percent composition of embodiment is: C: 〉=3.3%, Si:1.2-1.6%, Mn:＜0.5%, P:0.015-0.04%, S:＜0.05%.
Embodiment 1:
The preparation method of super low-temperature resistant high-tenacity nodular cast iron:
1, burden process:
Take by weighing respectively and account for the gross weight 50%Z14 pig iron, 15% No. 35 steel scraps, 35% QT melts down magnesium iron.
2, melting operation:
Adopt the main frequency furnace melting, by charger sheet the starting material that prepare are put into 1500-1550 ℃ of stove fusing in order and come out of the stove, carry out the stokehold and process; In the batching, the add-on of nickel ingot is 0.65%, and the add-on of bismuth ingot is 0.0055%.
3, stokehold treatment process:
Breed, the nodularization operation: a side of dykes and dams adds 0.7% nucleating agent (the nucleating agent granular size is between 8 ~ 20mm), 1.2% nodulizing agent (the nodulizing agent granular size is 5 ~ 20mm), and evenly sprinkles 2～5mm perlite in the casting ladle.Pour first the iron liquid of gross weight 70%, after spheroidizing reacion finishes, pour all the other iron liquid again, left standstill 1 ~ 2 minute, the graphite of cast iron and matrix refinement improve cast iron intensity.The result that stokehold cast chill block detects nodularization and breeds, qualified rear is pourable.
Nucleating agent contains rare earth: 5-10%, silicon: 55-65%, strontium: 0.5-1%; Barium: 0.2-0.5%, surplus is iron.
Nodulizing agent contains magnesium: 4-5%, and rare earth 8-10%, silicon: 45-55%, surplus is iron.
The weight percent composition of spheroidal graphite cast iron is: C:3.45, Si:2.38, Mn:＜0.3, P:＜0.03, S:＜0.01, Ni:0.65, Bi:0.005.
Embodiment 1 is detected according to the GB1348-88 standard, and its various technical indicators are as follows: tensile strength: 428MPMP; Hardness: 148HBW; Unit elongation: 20.3%; Ferrite quantity: more than 98%, 2 grades of nodulizing grades; Graphite order of magnitude 6-7 level; After testing, in the time of-40 ℃, impact property is 13.5J.
Embodiment 2:
The preparation method of super low-temperature resistant high-tenacity nodular cast iron:
1, burden process:
Take by weighing respectively and account for the gross weight 50%Z14 pig iron, 15% No. 35 steel scraps, 35% QT melts down magnesium iron.
2, melting operation:
Adopt the main frequency furnace melting, by charger sheet the starting material that prepare are put into 1500-1550 ℃ of stove fusing in order and come out of the stove, carry out the stokehold and process; In the batching, the add-on of nickel ingot is 0.8%, and the add-on of bismuth ingot is 0.0075%.
3, stokehold treatment process:
Breed, the nodularization operation: a side of dykes and dams adds 0.7% nucleating agent (the nucleating agent granular size is between 8 ~ 20mm), 1.2% nodulizing agent (the nodulizing agent granular size is 5 ~ 20mm), and evenly sprinkles 2～5mm perlite in the casting ladle.Pour first the iron liquid of gross weight 70%, after spheroidizing reacion finishes, pour all the other iron liquid again, left standstill 1 ~ 2 minute, the graphite of cast iron and matrix refinement improve cast iron intensity.The result that stokehold cast chill block detects nodularization and breeds, qualified rear is pourable.
Nucleating agent contains rare earth: 5-10%, silicon: 55-65%, strontium: 0.5-1%; Barium: 0.2-0.5%, surplus is iron.
Nodulizing agent contains magnesium: 4-5%, and rare earth 8-10%, silicon: 45-55%, surplus is iron.
The weight percent composition of spheroidal graphite cast iron is: C:3.39, Si:2.35, Mn:＜0.3, P:＜0.03, S:＜0.01, Ni:0.75, Bi:0.0078.
Embodiment 2 is detected according to the GB1348-88 standard, and its various technical indicators are as follows: tensile strength: 431MPMP; Hardness: 152HBW; Unit elongation: 21.3%; Ferrite quantity: more than 98%, 2 grades of nodulizing grades; Graphite order of magnitude 6-7 level; After testing, in the time of-40 ℃, impact property is 15.6J.
Embodiment 3:
The preparation method of super low-temperature resistant high-tenacity nodular cast iron:
1, burden process:
Take by weighing respectively and account for the gross weight 50%Z14 pig iron, 15% No. 35 steel scraps, 35% QT melts down magnesium iron.
2, melting operation:
Adopt the main frequency furnace melting, by charger sheet the starting material that prepare are put into 1500-1550 ℃ of stove fusing in order and come out of the stove, carry out the stokehold and process; In the batching, the add-on of nickel ingot is 0.9%, and the add-on of bismuth ingot is 0.01%.
3, stokehold treatment process:
Breed, the nodularization operation: a side of dykes and dams adds 0.7% nucleating agent (the nucleating agent granular size is between 8 ~ 20mm), 1.2% nodulizing agent (the nodulizing agent granular size is 5 ~ 20mm), and evenly sprinkles 2～5mm perlite in the casting ladle.Pour first the iron liquid of gross weight 70%, after spheroidizing reacion finishes, pour all the other iron liquid again, left standstill 1 ~ 2 minute, the graphite of cast iron and matrix refinement improve cast iron intensity.The result that stokehold cast chill block detects nodularization and breeds, qualified rear is pourable.
Nucleating agent contains rare earth: 5-10%, silicon: 55-65%, strontium: 0.5-1%; Barium: 0.2-0.5%, surplus is iron.
Nodulizing agent contains magnesium: 4-5%, and rare earth 8-10%, silicon: 45-55%, surplus is iron.
The weight percent composition of spheroidal graphite cast iron is: C:3.46, Si:2.29, Mn:＜0.3, P:＜0.03, S:＜0.01, Ni:0.89, Bi:0.0097.
Embodiment 3 is detected according to the GB1348-88 standard, and its various technical indicators are as follows: tensile strength: 435MPMP; Hardness: 155HBW; Unit elongation: 21.6%; Ferrite quantity: more than 98%, 2 grades of nodulizing grades; Graphite order of magnitude 6-7 level; After testing, in the time of-40 ℃, impact property is 14.1J.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (4)
1. low-temperature-resistance high-toughness spheroidal graphite cast iron, it is characterized in that: described spheroidal graphite cast iron contains the chemical element of following weight percent, carbon 3.3% ~ 3.5%, silicon 2.2% ~ 2.5%, manganese＜0.3%, phosphorus＜0.03%, sulphur＜0.01%, nickel 0.6% ~ 0.9%, bismuth 0.005% ~ 0.01%, surplus is iron.
2. the preparation method of low-temperature-resistance high-toughness spheroidal graphite cast iron claimed in claim 1, it is characterized in that: described preparation method comprises the steps:
Burden process: take by weighing respectively the 50%Z14 pig iron, 15% steel scrap, 35%QT foundry returns, 0.65% ~ 0.9% nickel ingot, 0.0055% ~ 0.01% bismuth ingot, 0.7% nucleating agent and 1.2% nodulizing agent;
The melting operation: the Z14 pig iron, steel scrap, QT foundry returns, nickel ingot, successively melting of bismuth ingot with burden process takes by weighing make the qualified iron liquid of chemical ingredients;
Breed, the nodularization operation: put into nucleating agent and nodulizing agent that the batching program takes by weighing, pour again the iron liquid of melting program preparation, finish the nodularization process.
3. the preparation method of low-temperature-resistance high-toughness spheroidal graphite cast iron according to claim 2, it is characterized in that: described nucleating agent is rare earth, silicon, strontium, bismuth matrix material, contains following weight percent material, rare earth: 5-10%, silicon: 55-65%, strontium: 0.5-1%; Barium: 0.2-0.5%, surplus is iron.
4. according to claim 2 or the preparation method of 3 described low-temperature-resistance high-toughness spheroidal graphite cast iron, it is characterized in that: described nodulizing agent contains following weight percent material, magnesium: 4-5%, and rare earth: 8-10%, silicon: 45-55%, surplus is iron.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532114A (en) * | 2014-12-30 | 2015-04-22 | 浙江振兴石化机械有限公司 | Low-nickel low-temperature-resistant cast iron material and preparation method thereof |
| CN107387854A (en) * | 2017-07-14 | 2017-11-24 | 常熟市虞菱机械有限责任公司 | A kind of part of revolving valves manual driving device the operating mode suitable for lower temperature |
| CN108193125A (en) * | 2018-03-19 | 2018-06-22 | 河北硕凯铸造有限公司 | A kind of TGC600 spheroidal graphite cast-iron and preparation method thereof |
| CN112359269A (en) * | 2020-09-29 | 2021-02-12 | 国电联合动力技术有限公司 | Nodular cast iron material for fan, preparation method and application of nodular cast iron for fan |
| CN113943845A (en) * | 2021-10-26 | 2022-01-18 | 陕西柴油机重工有限公司 | Production method of high-silicon solid-solution ferrite QT500-14 and QT600-10 nodular cast iron |
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| CN1176315A (en) * | 1996-07-25 | 1998-03-18 | Ae格策有限公司 | Iron casting alloy for producing piston ring of internal-combustion engine |
| CN101407885A (en) * | 2008-11-14 | 2009-04-15 | 辛彦 | High tenacity corrosion resistant ductile iron material |
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- 2012-08-16 CN CN201210291659.8A patent/CN102851571B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1176315A (en) * | 1996-07-25 | 1998-03-18 | Ae格策有限公司 | Iron casting alloy for producing piston ring of internal-combustion engine |
| CN101407885A (en) * | 2008-11-14 | 2009-04-15 | 辛彦 | High tenacity corrosion resistant ductile iron material |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532114A (en) * | 2014-12-30 | 2015-04-22 | 浙江振兴石化机械有限公司 | Low-nickel low-temperature-resistant cast iron material and preparation method thereof |
| CN107387854A (en) * | 2017-07-14 | 2017-11-24 | 常熟市虞菱机械有限责任公司 | A kind of part of revolving valves manual driving device the operating mode suitable for lower temperature |
| CN108193125A (en) * | 2018-03-19 | 2018-06-22 | 河北硕凯铸造有限公司 | A kind of TGC600 spheroidal graphite cast-iron and preparation method thereof |
| CN112359269A (en) * | 2020-09-29 | 2021-02-12 | 国电联合动力技术有限公司 | Nodular cast iron material for fan, preparation method and application of nodular cast iron for fan |
| CN113943845A (en) * | 2021-10-26 | 2022-01-18 | 陕西柴油机重工有限公司 | Production method of high-silicon solid-solution ferrite QT500-14 and QT600-10 nodular cast iron |
| CN113943845B (en) * | 2021-10-26 | 2024-02-23 | 陕西柴油机重工有限公司 | Production method of high-silicon solid solution ferrite QT500-14 and QT600-10 spheroidal graphite cast iron |
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