CN101289725A - Process for producing gray cast iron with high carbon equivalent, low alloy and middle-high strength - Google Patents
Process for producing gray cast iron with high carbon equivalent, low alloy and middle-high strength Download PDFInfo
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- CN101289725A CN101289725A CNA2008100550415A CN200810055041A CN101289725A CN 101289725 A CN101289725 A CN 101289725A CN A2008100550415 A CNA2008100550415 A CN A2008100550415A CN 200810055041 A CN200810055041 A CN 200810055041A CN 101289725 A CN101289725 A CN 101289725A
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Abstract
The invention belongs to the gray cast iron production method technical field, and in particular relates to a method for producing gray cast iron with high carbon equivalent, low alloy and mid-high strength, which solves the problem that the high carbon equivalent gray cast iron produced by adopting the prior art is low in mechanical property. Pig iron added in the method of the invention is low-silicon casting pig iron instead of mid-high silicon casting pig iron used in the casting tradition, and discharge liquid iron in the method is high-carbon liquid iron. When the discharge liquid iron is poured into a big ladle, self-made special composite inoculant made from rare earth ferro-silicon alloy, ferromanganese and silicon-calcium-barium inoculant is added to the stream, which greatly improves the mechanical property of the gray cast iron. The method solves the acknowledged difficult problem in the casting community that the gray cast iron is very low in mechanical property within the range of high carbon equivalent component. As new casting material, iron castings produced through the method can be popularized and applied on brake discs or brake hubs of automobiles in large quantities.
Description
Technical field
The invention belongs to the technical field of graphitic cast iron production method, be specifically related to a kind of method of producing carbon equivalent high, low-alloy, middle high-strength gray cast iron.
Background technology
The pig iron that the production of tradition graphitic cast iron is mainly used is middle and high silicon (siliceous 1.60～2.80%) foundry iron.For guaranteeing that graphitic cast iron reaches the mechanical property of middle and high intensity, generally adopt low-carbon-equivalent (2.90～3.50% carbon, 1.70～2.30% silicon), low alloying.With traditional graphitic cast iron production method, when adopting carbon equivalent high (as: 3.70～3.95% carbon, 1.60～2.10% silicon), the gray iron casting mechanical property of being produced is low, and generally the mechanical property that can obtain is: tensile strength sigma
b＜150MPa; The service requirements of stressed foundry goods can not be satisfied in hardness HB＜160, and therefore, the production of carbon equivalent high, low alloying, middle high-strength gray cast iron is the difficult problem that the casting circle generally acknowledges.
Automobile brake disc, braking hub are stressed foundry goods, relate to vehicle and driver and crew's personnel safety.Extensive at present low-carbon-equivalent (2.90～3.50% carbon, 1.70～2.30% silicon), the low-alloy grey-cast iron that adopts.But because of carbon content is low, graphite quantity is few in the microstructure of grey cast iron, exists absorbing poor, and friction noise is big, produce brake squeal, and frictional property is poor, easily produces braking and trembles; Be subjected to the heat crack tendency big, easily produce the shortcoming that the brake area fritter is peeled off.High-strength gray cast iron can remedy these shortcomings in employing carbon equivalent high, the low-alloy.
Summary of the invention
The present invention provides a kind of method of producing carbon equivalent high, low-alloy, middle high-strength gray cast iron in order to solve the low problem of carbon equivalent high graphitic cast iron mechanical property that adopts prior art to produce.
The present invention adopts following technical scheme to realize:
A kind of method of producing carbon equivalent high, low-alloy, middle high-strength gray cast iron the steps include:
1), add following furnace charge by following weight ratio in the stove:
20～40 parts of low silicon foundry irons, 30～40 parts of scrap steels, 25～40 parts of waste iron spares;
Carbon content according to above-mentioned three kinds of furnace charges adds the casting carburelant, and after casting should guarantee that with the carburelant add-on oxidization burning loss consumes in the stove, carbon content was 3.70～3.95%, and silicon content is 1.00～1.50%;
2), be warmed up to 1500～1550 ℃, add casting ferrosilicon, ferromanganese, ferrochrome, copper according to iron liquid composition result of laboratory test in the stove, the hot metal composition that will come out of the stove is controlled at: 3.70～3.95% carbon, 1.30～1.50% silicon, 0.50～0.70% manganese ,≤0.12% sulphur ,≤0.15% phosphorus, 0.20～0.40% chromium, 0.40～0.70% bronze medal;
Doing current-following inoculation when 3), coming out of the stove the big bag of molten iron impouring handles, the iron water amount that will handle by big bag, per 100 kilograms of inoculation alloys that molten iron added comprise: 0.10～0.20 kilogram of rare earth ferrosilicon alloy of casting, 0.10～0.20 kilogram in ferromanganese, 0.25～0.35 kilogram of silico-calcium barium nucleating agent;
4) after big iron clad water treatment finished, during from big bag impouring casting parcel, by the iron water amount of impouring parcel, per 100 kilograms of molten iron added 0.10～0.20 kilogram of silico-calcium barium nucleating agent with stream
Cast article composition scope of the present invention and mechanical property are as follows:
1, composition scope (weight percent):
Carbon 3.70～3.95%, silicon 1.60～2.10%, manganese 0.60～0.80%, sulphur≤0.12%, phosphorus≤0.15%, chromium 0.20～0.40%, copper 0.40～0.70%.
2, on standard Type B (Φ 30mm) separately cast test bar, or wall thickness is on the foundry goods of 10～25mm:
Tensile strength sigma
b190～240MPa
Hardness 180～220HB
3, metallographic structure
Graphite: A matrix shape graphite, 2～5 grades of graphite sizes
Matrix: perlite 〉=85%
The pig iron that method of the present invention adds in stove is low silicon foundry iron, rather than the middle and high silicon foundry iron of casting tradition use, and the molten iron of coming out of the stove is high-carbon molten iron (3.70～3.95% carbon).In the molten iron impouring of coming out of the stove big when bag, add the autogamy specific complex nucleating agent that is made into by rare earth ferrosilicon alloy, ferromanganese, silico-calcium barium nucleating agent with stream, increase A type graphite quantity, evenly, refinement A matrix shape graphite, increase, refine pearlite, increase substantially the mechanical property of graphitic cast iron.
The present invention has following beneficial effect:
1, solved the difficult problem that graphitic cast iron is generally acknowledged in very low this casting circle of carbon equivalent high composition range mechanical property.
2, adopt cheap low silicon foundry iron, cost is low.
3, the ironcasting of producing with this kind graphitic cast iron, because flake graphite content height, it is good to have an absorbing, and frictional property is good, is subjected to the heat crack tendency little, and the advantage that friction noise is low as a kind of casting novel material, can large-scale popularization be used on automobile brake disc, braking hub.
Embodiment
Get raw material, the material chemical component result of laboratory test:
1, low silicon foundry iron, 4.25% carbon, 1.21% silicon, 0.22% manganese, 0.046% sulphur, 0.148% phosphorus,
2, scrap steel, 0.30% carbon, 0.40% silicon, 0.40% manganese, 0.03% sulphur, 0.04% phosphorus,
3, waste iron spare, 3.76% carbon, 1.78% silicon, 0.73% manganese, 0.048% sulphur, 0.082% phosphorus, 0.26% chromium, 0.45% bronze medal,
4, casting carburelant, 92% carbon
5, the 75# ferrosilicon is used in casting, 72% silicon,
6,65# ferromanganese is used in casting, 63% manganese,
7, the 60# ferrochrome is used in casting, 59% chromium,
8, electrolytic copper, 99% bronze medal.
Embodiment 1: add following feed composition (5 kilograms every part are adopted 0.5 ton electric furnace) in the stove: 20 parts of low silicon foundry irons, and 40 parts of scrap steels, 40 parts of waste iron spares, 1.5 parts of carburelants of casting, the carbon content 3.85% of furnace charge in the stove, silicon content is 1.11%.
Be warmed up to 1500～1550 ℃, add and cast, 0.3 part in 65# ferromanganese of casting, 0.3 part in 60# ferrochrome of casting, 0.3 part of electrolytic copper with 0.4 part of 75# ferrosilicon; Remove oxidization burning loss consumption, the Chemical Composition of molten iron is in the stove: 3.78% carbon, 1.40% silicon, 0.67% manganese, 0.04% sulphur, 0.078% phosphorus, 0.27% chromium, 0.47% bronze medal.
After big bag and the processing of parcel secondary adding nucleating agent, big bag innoculant adding quantity is that per 100 kilograms of molten iron add: 0.1 kilogram of rare earth ferrosilicon alloy of casting, 0.12 kilogram in ferromanganese, 0.35 kilogram of silico-calcium barium nucleating agent, the parcel innoculant adding quantity is that per 100 kilograms of molten iron add: 0.20 kilogram of silico-calcium barium nucleating agent, product composition is: 3.77% carbon, 1.73% silicon, 0.74% manganese, 0.04% sulphur, 0.078% phosphorus, 0.27% chromium, 0.47% bronze medal.
Product mechanical property test result: at casting section thickness is the sampling of 22～25mm place,
1, tensile strength sigma
b=214MPa, hardness HB203
2, metallographic structure
Graphite: A matrix shape graphite, 3～5 grades of graphite sizes
Matrix: perlite＞90%
Embodiment 2: add following feed composition (10 kilograms every part are adopted 1 ton electric furnace) in the stove: 40 parts of low silicon iron, and 30 parts of scrap steels, 30 parts of waste iron spares, 1 part of carburelant of casting, the carbon content 3.84% of furnace charge in the stove, silicon content is 1.14%.
Be warmed up to 1500～1550 ℃, add and cast, 0.3 part in 65# ferromanganese of casting, 0.3 part in 60# ferrochrome of casting, 0.3 part of electrolytic copper with 0.4 part of 75# ferrosilicon; Remove oxidization burning loss consumption, the Chemical Composition of molten iron is in the stove: 3.76% carbon, 1.42% silicon, 0.61% manganese, 0.042% sulphur, 0.096% phosphorus, 0.25% chromium, 0.43% bronze medal.
After bag and parcel secondary added the nucleating agent processing greatly, wrapping innoculant adding quantity greatly was that per 100 kilograms of molten iron add: wrap nucleating agent greatly: cast with 0.20 kilogram of rare earth ferrosilicon alloy, 0.20 kilogram in ferromanganese, 0.30 kilogram of silico-calcium barium nucleating agent; The parcel innoculant adding quantity is that per 100 kilograms of molten iron add: 0.15 kilogram of silico-calcium barium nucleating agent, product composition is: 3.76% carbon, 1.80% silicon, 0.72% manganese, 0.042% sulphur, 0.096% phosphorus, 0.25% chromium, 0.43% bronze medal.
Product mechanical property test result: at casting section thickness is the sampling of 22～25mm place,
1, tensile strength sigma
b=208MPa, hardness HB198
2, metallographic structure
Graphite: A matrix shape graphite, 2～4 grades of graphite sizes
Matrix: perlite＞85%
Embodiment 3: add following feed composition (30 kilograms every part are adopted 3 tons of electric furnaces) in the stove: 35 parts of low silicon iron, and 35 parts of scrap steels, 25 parts of waste iron spares, 1.3 parts of carburelants of casting, the carbon content 3.86% of furnace charge in the stove, silicon content is 1.06%.
Be warmed up to 1500～1550 ℃, add and cast, 0.4 part in 65# ferromanganese of casting, 0.4 part in 60# ferrochrome of casting, 0.4 part of electrolytic copper with 0.5 part of 75# ferrosilicon; Remove oxidization burning loss consumption, the Chemical Composition of molten iron is in the stove: 3.78% carbon, 1.42% silicon, 0.65% manganese, 0.04% sulphur, 0.093% phosphorus, 0.29% chromium, 0.50% bronze medal.
After big bag and the processing of parcel secondary adding nucleating agent, big bag innoculant adding quantity is that per 100 kilograms of molten iron add: 0.20 kilogram of rare earth ferrosilicon alloy of casting, 0.10 kilogram in ferromanganese, 0.25 kilogram of silico-calcium barium nucleating agent, the parcel innoculant adding quantity is that per 100 kilograms of molten iron add: 0.10 kilogram of silico-calcium barium nucleating agent, product composition is: 3.78% carbon, 1.69% silicon, 0.70% manganese, 0.04% sulphur, 0.093% phosphorus, 0.29% chromium, 0.50% bronze medal.
Product mechanical property test result: at casting section thickness is the sampling of 22～25mm place,
1, tensile strength sigma
b=217MPa, hardness HB204
2, metallographic structure
Graphite: A matrix shape graphite, 3～5 grades of graphite sizes
Matrix: perlite＞90%
Claims (1)
1, a kind of method of producing carbon equivalent high, low-alloy, middle high-strength gray cast iron the steps include:
1), add following furnace charge by following weight ratio in the stove:
20～40 parts of low silicon foundry irons, 30～40 parts of scrap steels, 25～40 parts of waste iron spares;
Carbon content according to above-mentioned three kinds of furnace charges adds the casting carburelant, and after casting should guarantee that with the carburelant add-on oxidization burning loss consumes in the stove, carbon content was 3.70～3.95%, and silicon content is 1.00～1.50%;
2), be warmed up to 1500～1550 ℃, add casting ferrosilicon, ferromanganese, ferrochrome, copper according to iron liquid composition result of laboratory test in the stove, the hot metal composition that will come out of the stove is controlled at: 3.70～3.95% carbon, 1.30～1.50% silicon, 0.50～0.70% manganese ,≤0.12% sulphur ,≤0.15% phosphorus, 0.20～0.40% chromium, 0.40～0.70% bronze medal;
Doing current-following inoculation when 3), coming out of the stove the big bag of molten iron impouring handles, the iron water amount that will handle by big bag, per 100 kilograms of inoculation alloys that molten iron added comprise: 0.10～0.20 kilogram of rare earth ferrosilicon alloy of casting, 0.10～0.20 kilogram in ferromanganese, 0.25～0.35 kilogram of silico-calcium barium nucleating agent;
4) after big iron clad water treatment finished, during from big bag impouring casting parcel, by the iron water amount of impouring parcel, per 100 kilograms of molten iron added 0.10～0.20 kilogram of silico-calcium barium nucleating agent with stream.
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| CN102015158A (en) * | 2009-01-09 | 2011-04-13 | 曼恩载重汽车股份公司 | Cast iron alloy for cylinder heads |
| CN102220539A (en) * | 2011-05-13 | 2011-10-19 | 无锡小天鹅精密铸造有限公司 | Production technology of high-phosphorus iron casting |
| CN102296236A (en) * | 2011-08-12 | 2011-12-28 | 河曲县万联节能材料有限公司 | Wear resistant steel ball and segment specially used in mines |
| CN102776433A (en) * | 2012-07-10 | 2012-11-14 | 常州常瑞天力动力机械有限公司 | Reinforced composite post inoculation technology for short-flow smelting |
| CN103225037A (en) * | 2013-05-28 | 2013-07-31 | 程利国 | High-carbon gray cast iron automobile brake disk and production method thereof |
| CN103394656A (en) * | 2013-08-15 | 2013-11-20 | 张传海 | Preparation method for combined nucleating agent used for casting |
| CN103484794A (en) * | 2013-09-11 | 2014-01-01 | 北京工业大学 | Multi-component alloy cast iron preparation method |
| CN103484591A (en) * | 2013-08-26 | 2014-01-01 | 山西荣汇通铸造行业技术中心有限公司 | Inoculation method for improving tensile strength of gray iron |
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| CN105624545A (en) * | 2016-01-21 | 2016-06-01 | Bpw(梅州）车轴有限公司 | High-carbon-equivalent brake disc and preparing method thereof |
| CN106676250A (en) * | 2016-12-15 | 2017-05-17 | 广西大学 | Thermal treatment method for chilled cast iron roll |
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| US9132478B2 (en) | 2009-01-09 | 2015-09-15 | Man Truck & Bus Ag | Cast iron alloy for cylinder heads |
| CN102015158B (en) * | 2009-01-09 | 2016-06-08 | 曼恩卡车和公共汽车股份公司 | Cast-iron alloy for cylinder head |
| CN102015158A (en) * | 2009-01-09 | 2011-04-13 | 曼恩载重汽车股份公司 | Cast iron alloy for cylinder heads |
| EP2646588B1 (en) | 2010-12-02 | 2022-02-16 | Brembo S.p.A. | Brake disc for a disc brake |
| CN102220539A (en) * | 2011-05-13 | 2011-10-19 | 无锡小天鹅精密铸造有限公司 | Production technology of high-phosphorus iron casting |
| CN102220539B (en) * | 2011-05-13 | 2012-12-26 | 无锡小天鹅精密铸造有限公司 | Production technology of high-phosphorus iron casting |
| CN102296236B (en) * | 2011-08-12 | 2012-12-05 | 河曲县万联节能材料有限公司 | Wear resistant steel ball and segment specially used in mines |
| CN102296236A (en) * | 2011-08-12 | 2011-12-28 | 河曲县万联节能材料有限公司 | Wear resistant steel ball and segment specially used in mines |
| CN102776433A (en) * | 2012-07-10 | 2012-11-14 | 常州常瑞天力动力机械有限公司 | Reinforced composite post inoculation technology for short-flow smelting |
| CN103225037B (en) * | 2013-05-28 | 2015-09-09 | 夏邑县淮海铸造有限公司 | High-carbon gray cast iron automobile brake disk and production method thereof |
| CN103225037A (en) * | 2013-05-28 | 2013-07-31 | 程利国 | High-carbon gray cast iron automobile brake disk and production method thereof |
| CN103394656A (en) * | 2013-08-15 | 2013-11-20 | 张传海 | Preparation method for combined nucleating agent used for casting |
| CN103484591A (en) * | 2013-08-26 | 2014-01-01 | 山西荣汇通铸造行业技术中心有限公司 | Inoculation method for improving tensile strength of gray iron |
| CN103484794A (en) * | 2013-09-11 | 2014-01-01 | 北京工业大学 | Multi-component alloy cast iron preparation method |
| CN103993219A (en) * | 2014-05-08 | 2014-08-20 | 福建龙生机械有限公司 | High-toughness synthetic cast iron cylinder-sleeve material and manufacturing process |
| CN103993219B (en) * | 2014-05-08 | 2016-02-24 | 福建龙生机械有限公司 | A kind of high tough synthetic cast iron cylinder jacket material and manufacturing process thereof |
| CN105624545A (en) * | 2016-01-21 | 2016-06-01 | Bpw(梅州）车轴有限公司 | High-carbon-equivalent brake disc and preparing method thereof |
| CN105624545B (en) * | 2016-01-21 | 2019-01-08 | Bpw(梅州）车轴有限公司 | A kind of carbon equivalent high brake disc and preparation method thereof |
| CN106676250A (en) * | 2016-12-15 | 2017-05-17 | 广西大学 | Thermal treatment method for chilled cast iron roll |
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Owner name: SHANXI HENGTAI BRAKE CO., LTD. Free format text: FORMER OWNER: XIANGFEN HENGTAI BRAKE SYSTEM CO., LTD. Effective date: 20111230 |
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