CN105256220A - Low-temperature high-toughness nodular cast iron winding drum and preparation method thereof - Google Patents
Low-temperature high-toughness nodular cast iron winding drum and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of casting, and relates to a low-temperature high-toughness nodular cast iron winding drum and a preparation method thereof. The low-temperature high-toughness nodular cast iron winding drum is characterized by comprising the following components by mass percentage: 3.6-3.8% of C, 1.8-2.2% of Si, less than 0.2% of Mn, 0.03-0.05% of Mg, 0.01-0.025% of RE, less than 0.020% of S, less than 0.03% of P, less than 0.025% of Ti, less than 0.15% of Ni and the balance Fe. The preparation method of the high-toughness nodular cast iron winding drum comprises the steps of smelting, spheroidizing treatment, primary inoculation treatment, secondary inoculation treatment, annealing and the like. The preparation method is simple. As nodular cast iron does not contain noble metallic elements such as yttrium and lanthanum, the low-temperature high-toughness nodular cast iron winding drum is low in raw material cost and production cost and is easy to popularize and apply.
Description
Technical field
The invention belongs to casting technology field, relate to a kind of Low-temperature high-tenacity nodular cast iron reel and preparation method thereof.
Background technology
Along with the development & construction of the Larger Engineering Projects of China northeast, Inner Mongol and Xinjiang and Russia, North America and Northern Europe various countries extremely frigid zones, day by day urgent to the demand of low temperature large-scale engineering machinery in the world.High-performance reel is one of key part of goliath and hoisting speed reducer, because the wireline of load-bearing is directly wrapped on reel, reel directly bears sling load, and the safe operation of its quality good or not on lifting machine and hoisting speed reducer has vital impact.Because the low-temperature impact toughness of common spheroidal graphite cast iron reel is lower, be easy under cryogenic brittle rupture occurs, the technical property requirements of low temperature environment cannot be met.The large lifting equipment worked under low temperature environment is in the urgent need to using Low-temperature high-tenacity nodular cast iron reel.The lifting machine worked at low ambient temperatures and hoisting speed reducer must select Low-temperature high-tenacity nodular cast iron reel, ensure its reliable and use safety with this.Publication number is that the Chinese patent of CN103556043A discloses a kind of high tenacity high rigidity ductile cast iron material used under condition of ultralow temperature and preparation method thereof, the manufacture of the engineering goods part foundry goods used under being mainly used in condition of ultralow temperature, but the composition of spheroidal graphite cast iron is containing Ni20%-28% (mass percent) in this patent, cost is very high, is difficult to promote.Publication number is that the Chinese patent of CN201210291659.8 discloses a kind of low-temperature-resistance high-toughness spheroidal graphite cast iron and preparation method thereof, the spheroidal graphite cast iron adopting the method to prepare is low temperature resistant, toughness is high, use properties is good, but containing Ni0.6%-0.9% in spheroidal graphite cast iron composition, containing Bi0.005-0.01%, cost is still higher, is unfavorable for applying.Publication number is the preparation method that the Chinese patent of CN103757172A discloses a kind of spheroidal graphite cast iron, this spheroidal graphite cast iron can meet the quality requirement of the low temperature high-performance foundry goods such as the higher wind-powered electricity generation of specification of quality, nuclear power, high ferro, but only ensures the low temperature over-all properties of spheroidal graphite cast iron under-20 DEG C of conditions.Therefore, the spheroidal graphite cast iron reel that research and development can use under≤-40 DEG C of cold condition, to the engineering construction of extremely frigid zones and Economic development has important practical significance and using value.
Summary of the invention
Low-temperature high-tenacity nodular cast iron reel that the object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide that a kind of technique is simple, production cost is low, can use under≤-40 DEG C of environment and preparation method thereof.
The present invention is achieved in the following ways:
A kind of Low-temperature high-tenacity nodular cast iron reel, it is characterized in that the component (mass percent) of Low-temperature high-tenacity nodular cast iron is: C3.6-3.8%, Si1.8-2.2%, Mn < 0.2%, Mg0.03-0.05%, RE0.01-0.025%, S<0.020%, P<0.03%, Ti < 0.025%, Ni < 0.15%, surplus Fe.
The starting material of Low-temperature high-tenacity nodular cast iron are made up of the high-carbon low manganese magnesium iron pig iron, industrial steel scrap, foundry returns, appropriate nickel; Being made into mass percent is: pig iron 40-60%, steel scrap 10-20%, foundry returns 30-40%, then the nickel adding mass percent 0.13-0.15% in addition; With greying carburelant adjustment carbon content, with silicon barium calcium nucleating agent (aluminium content is less than 0.5%) adjustment silicon amount; Low magnesium-rare earth nodulizing agent is adopted to carry out spheroidizing, spheroidization treatment temperature 1470-1490 DEG C.The mass percent of nodulizing agent composition is: the impurity element total amount < 0.5% such as Mg7-8%, RE1-1.5%, Si40-44%, Ca2-2.5%, Ba0.5-1.0%, Mn/Al/Ti/S/P, surplus is iron.Nodulizing agent add-on is the 1.3-1.4% of iron liquid total mass; Adopt late inoculation treatment process; Innoculant adding quantity is the 0.8-1.2% of iron liquid total mass, and instantaneous inoculant is the Si-Ba-Ca alloy nucleating agent of bismuth-containing, molybdenum, and its mass percent is: Si65-70%, Bi1.5-2.5%, Mo1.0-1.5%, Ca1.5-2.0%, Ba3.5-5.0%, Al<0.5%, Ti<0.05%, Mn<0.4%, S<0.02%, P<0.05%, surplus is Fe, and add-on is 0.05-0.1%.
The preparation method of above-mentioned a kind of Low-temperature high-tenacity nodular cast iron reel, is characterized in that comprising the following steps:
1) melting: raw material adopts the high-carbon low manganese magnesium iron pig iron, industrial steel scrap, foundry returns and appropriate nickel; Be first the 40-60% pig iron by mass percent, the raw material of 10-20% steel scrap and 30-40% foundry returns prepares post-heating and be fused into molten iron; And then add nickel, be the 0.13-0.15% of molten iron total mass; Require that the iron liquid chemical composition after adding nickel and mass percent thereof are respectively: C3.6-3.8%, Si1.3-1.5%, Mn0.1-0.25%, Mg0.03-0.05%, RE0.01-0.025%, S<0.02%, P<0.03%, Ti < 0.025%, nickel < 0.15%; When bonded hard ferrite magnet reaches 1470-1490 DEG C, insulation, then skims and carries out spheroidizing;
2) spheroidizing: be placed in bottom casting ladle by low magnesium-rare earth nodulizing agent, it covers Si-Ba-Ca alloy nucleating agent (siliceous mass percent is 70-75%), adopts spheriodizing technique to carry out spheroidizing to cast iron; After spheroidizing, magnesium residual volume controls at 0.03-0.05%, and rare earth residual volume controls to control at < 0.025% at 0.01-0.025%, Ti residual volume;
3) inoculation: after nodularization completes, adds Si-Ba-Ca alloy nucleating agent and carries out first time inoculation, to eliminate the chilling tendency that nodularization element causes, and the graphite pebbles of refinement simultaneously; The add-on of a nucleating agent is the 0.3%-0.5% of iron liquid total mass;
4) late inoculation process: the calsibar alloy nucleating agent adding iron liquid total mass 0.1% bismuth-containing, molybdenum in casting process with stream, carries out late inoculation process; After this process, calcium contents controls at 0.005-0.010%, barium content controls at 0.005-0.010%, and 0.010%≤Ca+Ba≤0.020%, bi content≤0.003%, molybdenum content≤0.05%, to eliminate cementite, the carbide in process of setting, the delayed involution time, promote graphite refinement, Dispersed precipitate, increase the number of graphite;
5) anneal: pour into a mould after 12-24 hour, unpack, clear up; Then, carry out stress relief annealing process at 500-550 DEG C, after soaking time 12-16 hour, cool to room temperature with the furnace.
The preparation method of above-mentioned a kind of Low-temperature high-tenacity nodular cast iron reel, is characterized in that step 2) in the siliceous mass percent of Si-Ba-Ca alloy nucleating agent be 70-75%.
The present invention compared with prior art, has the following advantages:
1) the present invention is a kind of Low-temperature high-tenacity nodular cast iron reel and preparation method thereof, by controlling spheroidal graphite cast iron composition, improve nodularization and inoculated technology and control the quantity of graphite pebbles in magnesium iron, size, form and distribution, adopt electrosmelting, prepare the spheroidal graphite cast iron reel that can use under≤-40 DEG C of cold condition.Processing method of the present invention is simple, and not containing the noble metal such as yttrium, lanthanum element in magnesium iron, raw material and low production cost, be easy to apply.
2) comprehensive mechanical property of Low-temperature high-tenacity nodular cast iron of the present invention is good, and especially low-temperature impact toughness is high, its tensile strength MPa >=400MPa, yield strength >=260MPa, unit elongation δ >=22% ,-40 DEG C of Impact energy Ak v >=13J.
Embodiment
Provide two most preferred embodiments of the present invention below:
Embodiment one
Adopt 5 tons of electrosmelting of intermediate frequency ductile iron materials, the first heat melting; Concrete technology step is as follows:
(1) be made into according to mass percent: the high-carbon low manganese magnesium iron pig iron 50%, steel scrap 15%, foundry returns 35%, and Hybrid Heating is fused into molten iron; Adding nickel again, is 0.14% of molten iron total mass; When molten iron temperature reaches 1490 DEG C, add the Si-Ba-Ca alloy nucleating agent (siliceous mass percent is 75%) of 0.8-1.2%, after stokehold adjusting component is qualified, insulation of skimming was come out of the stove after 1 minute.
(2) by total add-on be 1.4% low magnesium-rare earth nodulizing agent be placed in bottom casting ladle, adopt lid bag dam-type to pour method spheriodizing technique and spheroidizing carried out to cast iron.
(3) after nodularization completes, when pack processing turns pouring ladle, pour Si-Ba-Ca alloy nucleating agent, evenly pour by 0.5% of molten iron total mass in step (1), complete first time inoculation.
(4) pour into a mould reel when molten iron temperature reaches 1390 DEG C, in casting process, pour the silicon barium calcium nucleating agent of bismuth-containing, molybdenum with stream, by 0.06% of molten iron total mass in step (1), and evenly synchronously pour, complete late inoculation process.
(5) pour into a mould after 16 hours, cleaning dead head of unpacking, then carries out stress relief annealing process at≤250 DEG C, and intensification 2-4 hour, 500-500 DEG C insulation 3-4 time hour, stove is cold drops to≤200 DEG C of air coolings of coming out of the stove.
Reel chemical composition is in table 1, and reel performance is in table 2 and table 3.
Embodiment two
Adopt 5 tons of electrosmelting of intermediate frequency ductile iron materials, the second heat melting, concrete technology step is as follows:
(1) be made into according to mass percent: the high-carbon low manganese magnesium iron pig iron 50%, steel scrap 10%, foundry returns 40%, and Hybrid Heating is fused into molten iron; Adding nickel again, is 0.13% of iron liquid total mass; When molten iron temperature reaches 1470 DEG C, then add the Si-Ba-Ca alloy nucleating agent (siliceous mass percent is 72%) of 0.6%, after stokehold adjusting component is qualified, insulation of skimming was come out of the stove after 2 minutes.
(2) by total add-on be 1.3% low magnesium-rare earth nodulizing agent be placed in bottom casting ladle, adopt lid bag dam-type to pour method spheriodizing technique and spheroidizing carried out to cast iron.
(3) after nodularization completes, when pack processing turns pouring ladle, pour Si-Ba-Ca alloy nucleating agent, evenly pour by 0.4% of molten iron total mass in step (1), complete first time inoculation.
(4) pour into a mould reel when molten iron temperature reaches 1380 DEG C, in casting process, pour the silicon barium calcium nucleating agent of bismuth-containing, molybdenum with stream, by 0.1% of molten iron total mass in step (1), and evenly synchronously pour, complete late inoculation process.
(5) pour into a mould after 16 hours, cleaning dead head of unpacking, then carries out stress relief annealing process at≤250 DEG C, and intensification 2-4 hour, 500-500 DEG C insulation 3-4 time hour, stove is cold drops to≤200 DEG C of air coolings of coming out of the stove.
Reel chemical composition is in table 1, and reel performance is in table 2 and table 3.
The chemical composition (mass percent, %) of table 1 reel
| Element | C | Si | Mn | Mg | RE | S | P | Ti | Ni |
| Embodiment 1 | 3.67 | 2.08 | 0.19 | 0.03 | 0.019 | 0.019 | 0.030 | 0.024 | 0.13 |
| Embodiment 2 | 3.72 | 1.97 | 0.20 | 0.04 | 0.017 | 0.018 | 0.029 | 0.023 | 0.12 |
The mechanical property (single casting sample) of table 2 reel
The ballistic work (v-notch sample) of table 3 reel, unit: J
| Numbering | Room temperature 25 DEG C | Low temperature ﹣ 20 DEG C | Low temperature ﹣ 40 DEG C |
| 1﹟ | 19.8 | 17.4 | 13.5 |
| 2﹟ | 19.8 | 18.9 | 14.2 |
Claims (3)
1. a Low-temperature high-tenacity nodular cast iron reel, it is characterized in that the constituent mass per-cent of Low-temperature high-tenacity nodular cast iron is: C3.6-3.8%, Si1.8-2.2%, Mn < 0.2%, Mg0.03-0.05%, RE0.01-0.025%, S<0.020%, P<0.03%, Ti < 0.025%, Ni < 0.15%, surplus Fe.
2. the preparation method of a kind of Low-temperature high-tenacity nodular cast iron reel according to claim 1, is characterized in that comprising the following steps:
1) melting: raw material adopts the high-carbon low manganese magnesium iron pig iron, industrial steel scrap, foundry returns and appropriate nickel; By mass percent be first: pig iron 40-60%, industrial steel scrap 10-20%, foundry returns 30-40% prepares post-heating and is fused into molten iron; And then add nickel, be the 0.13-0.15% of molten iron total mass; Require that the iron liquid chemical composition after adding nickel and mass percent thereof are respectively: C3.6-3.8%, Si1.3-1.5%, Mn0.1-0.25%, Mg0.03-0.05%, RE0.01-0.025%, S<0.02%, P<0.03%, nickel < 0.15%, Ti < 0.025%; When bonded hard ferrite magnet reaches 1470-1490 DEG C, insulation, then skims and carries out spheroidizing;
2) spheroidizing: be placed in bottom casting ladle by low magnesium-rare earth nodulizing agent, it covers Si-Ba-Ca alloy nucleating agent, adopts spheriodizing technique to carry out spheroidizing to cast iron; After spheroidizing, magnesium residual volume controls at 0.03-0.05%, and rare earth residual volume controls to control at < 0.025% at 0.01-0.025%, Ti residual volume;
3) inoculation: after nodularization completes, adds Si-Ba-Ca alloy nucleating agent and carries out first time inoculation, to eliminate the chilling tendency that nodularization element causes, and the graphite pebbles of refinement simultaneously; The add-on of a nucleating agent is the 0.3%-0.5% of molten iron total mass;
4) late inoculation process: the calsibar alloy nucleating agent adding molten iron total mass 0.1% bismuth-containing, molybdenum in casting process with stream, carries out late inoculation process; After this process, calcium contents controls at 0.005-0.010%, barium content controls at 0.005-0.010%, and 0.010%≤Ca+Ba≤0.020%, bi content≤0.003%, molybdenum content≤0.05%, to eliminate cementite, the carbide in process of setting, the delayed involution time, promote graphite refinement, Dispersed precipitate, increase the number of graphite;
5) anneal: pour into a mould after 12-24 hour, unpack, clear up; Then, carry out stress relief annealing process at 500-550 DEG C, after soaking time 12-16 hour, cool to room temperature with the furnace.
3. the preparation method of a kind of Low-temperature high-tenacity nodular cast iron reel according to claim 2, is characterized in that step 2) the middle siliceous 70-75wt% of Si-Ba-Ca alloy nucleating agent.
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| CN105886692A (en) * | 2016-04-22 | 2016-08-24 | 锦州捷通铁路机械制造有限公司 | Production technology of - 70 DEG C ultra-low temperature and high tenacity ductile cast iron |
| CN107557659A (en) * | 2017-10-30 | 2018-01-09 | 山东汇丰铸造科技股份有限公司 | A kind of spheroidal graphite cast-iron reel of low-temperature-resistance high-toughness and preparation method thereof |
| CN107699787A (en) * | 2017-10-30 | 2018-02-16 | 山东汇丰铸造科技股份有限公司 | A kind of spheroidal graphite cast-iron of low-temperature-resistance high-toughness and preparation method thereof |
| CN107794438A (en) * | 2017-10-23 | 2018-03-13 | 广东现代铸造有限公司 | Spheroidal graphite cast-iron, crankcase and high velocity ram machine lathe bed |
| CN108588545A (en) * | 2018-03-19 | 2018-09-28 | 河北硕凯铸造有限公司 | A kind of GGG70L spheroidal graphite cast-iron and preparation method thereof |
| CN109182635A (en) * | 2018-09-19 | 2019-01-11 | 中车大连机车车辆有限公司 | The inoculation treating method of spheroidal graphite cast-iron |
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| CN110453140A (en) * | 2019-09-16 | 2019-11-15 | 益阳紫荆福利铸业有限公司 | A kind of low-temperature ball spheroidal graphite cast iron material and its preparation method and application |
| CN110565005A (en) * | 2019-09-06 | 2019-12-13 | 郴州市鼎新铸造有限责任公司 | Production process method of low-temperature ductile iron casting |
| CN110760738A (en) * | 2019-09-17 | 2020-02-07 | 上海烟草机械有限责任公司 | Method for manufacturing low-temperature impact-resistant ductile cast iron |
| CN111910120A (en) * | 2020-08-10 | 2020-11-10 | 安徽恒升铸业有限公司 | Preparation method of high-toughness nodular cast iron |
| CN112410655A (en) * | 2020-11-11 | 2021-02-26 | 清华大学 | High-heat-conductivity and high-toughness nodular cast iron and preparation method thereof |
| CN114058937A (en) * | 2021-11-19 | 2022-02-18 | 襄阳金耐特机械股份有限公司 | Low-temperature high-toughness nodular cast iron and application thereof |
| CN116043099A (en) * | 2023-01-18 | 2023-05-02 | 株洲九方铸造股份有限公司 | Ultralow-temperature spheroidal graphite cast iron for rail transit and production process thereof |
| CN117604371A (en) * | 2023-12-12 | 2024-02-27 | 河北京东管业有限公司 | Spheroidal graphite cast iron and preparation method thereof |
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| CN105886692A (en) * | 2016-04-22 | 2016-08-24 | 锦州捷通铁路机械制造有限公司 | Production technology of - 70 DEG C ultra-low temperature and high tenacity ductile cast iron |
| CN107794438A (en) * | 2017-10-23 | 2018-03-13 | 广东现代铸造有限公司 | Spheroidal graphite cast-iron, crankcase and high velocity ram machine lathe bed |
| CN107557659A (en) * | 2017-10-30 | 2018-01-09 | 山东汇丰铸造科技股份有限公司 | A kind of spheroidal graphite cast-iron reel of low-temperature-resistance high-toughness and preparation method thereof |
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| CN109182635A (en) * | 2018-09-19 | 2019-01-11 | 中车大连机车车辆有限公司 | The inoculation treating method of spheroidal graphite cast-iron |
| CN110284051A (en) * | 2019-05-10 | 2019-09-27 | 芜湖泓鹄材料技术有限公司 | A kind of high intensity drawing die material and drawing die production method |
| CN110565005A (en) * | 2019-09-06 | 2019-12-13 | 郴州市鼎新铸造有限责任公司 | Production process method of low-temperature ductile iron casting |
| CN110453140A (en) * | 2019-09-16 | 2019-11-15 | 益阳紫荆福利铸业有限公司 | A kind of low-temperature ball spheroidal graphite cast iron material and its preparation method and application |
| CN110760738A (en) * | 2019-09-17 | 2020-02-07 | 上海烟草机械有限责任公司 | Method for manufacturing low-temperature impact-resistant ductile cast iron |
| CN110760738B (en) * | 2019-09-17 | 2022-01-14 | 上海烟草机械有限责任公司 | Method for manufacturing low-temperature impact-resistant ductile cast iron |
| CN111910120A (en) * | 2020-08-10 | 2020-11-10 | 安徽恒升铸业有限公司 | Preparation method of high-toughness nodular cast iron |
| CN112410655A (en) * | 2020-11-11 | 2021-02-26 | 清华大学 | High-heat-conductivity and high-toughness nodular cast iron and preparation method thereof |
| CN112410655B (en) * | 2020-11-11 | 2021-12-21 | 清华大学 | High-heat-conductivity and high-toughness nodular cast iron and preparation method thereof |
| CN114058937A (en) * | 2021-11-19 | 2022-02-18 | 襄阳金耐特机械股份有限公司 | Low-temperature high-toughness nodular cast iron and application thereof |
| CN116043099A (en) * | 2023-01-18 | 2023-05-02 | 株洲九方铸造股份有限公司 | Ultralow-temperature spheroidal graphite cast iron for rail transit and production process thereof |
| CN117604371A (en) * | 2023-12-12 | 2024-02-27 | 河北京东管业有限公司 | Spheroidal graphite cast iron and preparation method thereof |
| CN117604371B (en) * | 2023-12-12 | 2024-07-12 | 河北京东管业有限公司 | Spheroidal graphite cast iron and preparation method thereof |
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Application publication date: 20160120 |