CN102080178A - Quasi-casting high toughness bainitic low-carbon ductile iron and producing method thereof - Google Patents
Quasi-casting high toughness bainitic low-carbon ductile iron and producing method thereof Download PDFInfo
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- CN102080178A CN102080178A CN2004100217946A CN200410021794A CN102080178A CN 102080178 A CN102080178 A CN 102080178A CN 2004100217946 A CN2004100217946 A CN 2004100217946A CN 200410021794 A CN200410021794 A CN 200410021794A CN 102080178 A CN102080178 A CN 102080178A
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a quasi-casting high toughness bainitic low-carbon ductile iron and a producing method thereof, which belong to the technical field of metal materials. The structure of the high toughness bainitic low-carbon ductile iron is that petty and round graphite nodules are uniformly distributed on a bainitic ferritic and austenitic metal substrate. The primary processing steps comprise blending, fusion and modification and quasi-casting bainite treatment of the low-carbon cast iron. The invention has the advantages of simple process, strong operability, low cost, low energy consumption and small pollution, and eco-friendliness, and the obtained low-carbon ductile iron has the advantages of high toughness and high wear-resistance.
Description
Technical field: the present invention relates to a kind of high-strong toughness bainite Low Carbon Ductile Iron and preparation method thereof, belong to the metallic substance technical field.
Technical background: casting industry is mechanical industry and manufacturing basis, and the existing ironcasting output of China is rank the first in the world, is universally acknowledged castings production big country.Still also there is big gap in China aspect foundry engieering a lot, also be not the power of iron casting production but compared with developed countries.Although at present existing more than the 20000 tame foundry of China, low gear castings production ability is superfluous, and the insufficient far away problem of high gear castings production ability still is difficult to be resolved at short notice.The automobile casting that part is had relatively high expectations, heavy caliber (φ 2600mm) centrifugal ductile cast iron pipes, compressor of air conditioner also needs import so far with foundry goods.Many Japan, U.S. travelling trader require also to can not find suitable manufacturer at present at the high-grade ironcasting of China's buying.
Conventional metals, particularly ferrous materials have purposes very widely in industrial production, its each great technical progress all will bring tremendous influence to China's mechanical industry and national economy.The developing history of ferrous materials is a motivating force to improve its obdurability mainly, and further developing of it also will be like this.Day by day Yan Ge environment and resource constraint, making with the cleaner production is that the green casting of feature is more and more important, it will become manufacturing key character of 21 century.Guarantee casting industry in the Sustainable development of new millennium, just must thoroughly change the casting industry energy-consuming consumptive material, the backwards situation of serious environment pollution makes it can embody more that cleaning is made and green feature of casting.
Since nineteen forty-seven Englishman Morrgh finds to exist the cast iron of globular graphite under the as cast condition, passed by the course of over half a century of spheroidal graphite cast iron.Because magnesium iron has good mechanical property, advantages of good casting and the cost more much lower than cast steel, therefore be subjected to the attention of people's height.But spheroidal graphite cast iron always is the high-carbon high-quality molten iron of continuing to use eutectic or hypereutectic composition from that day of being born, and the spheroidizing through traditional nodulizing agents such as magnesium or rare earths obtains through fully breeding again.In the evolution of traditional spheroidal graphite cast iron, the spheroidal graphite cast iron that carbon content is lower than 2.2%C never appearred, and the precedent of spheroidal graphite cast iron also never appearred producing as nodulizing agent with anti-nodularization surface active element specially.
The appearance of Austenite-Bainite Ductile Iron (ADI) is considered to one of the most great achievement in the cast iron metallurgy aspect seventies in 20th century, and it makes the comprehensive mechanical performance of spheroidal graphite cast iron bring up to a unprecedented level.Yet the production of Ao-Bei spheroidal graphite cast iron always is basically and continues to use alloying elements such as adding nickel, molybdenum in the domestic and international up to now industrial production, and realize by the process means of isothermal quenching.Generally, Ao-Bei spheroidal graphite cast iron will seek out higher comprehensive mechanical performance and ideal tissue, have only alloying elements such as nickel by adding some amount, molybdenum, copper, make the shape and the position of magnesium iron C curve need become the S curve that has two noses and the position is moved to right by it, thus the hardening capacity of the critical cooling velocity of reduction foundry goods, expansion austenitic area, raising foundry goods etc.Only in this way, could guarantee that foundry goods obtains ideal austenite-bainite structure.Should be noted that, though adding alloying elements such as nickel, molybdenum can make cast iron just obtain bainite under as cast condition and make its over-all properties obtain by a relatively large margin raising, but because nickel and molybdenum all are materials comparatively in short supply in China, price is also relatively more expensive, adds nickel-molybdenum alloy the cost of foundry goods will be increased; Though isothermal quenching technique technology comparative maturity, power consumption, consuming time serious, the size and the shape of foundry goods there are a lot of restrictions; High-temperature heat treatment makes the cast(ing) surface oxidation easily, makes the foundry goods of inhomogeneity of wall thickness produce distortion, also can pollute environment.Therefore, above-mentioned behave not only makes casting cost greatly increase, but also makes the popularization of Ao-Bei cast iron become comparatively difficult.People are expecting to seek a kind of nickel-molybdenum alloy that does not need to add costliness, also must not carry out isothermal quenching thermal treatment, just can make cast iron obtain ideal Ao-Bei tissue under as cast condition, and have the operational path and the processing method of higher comprehensive mechanical performance.
The appearance of as-cast bainite magnesium iron, the isothermal quenching heat treatment step when making the production of Ao-Bei magnesium iron remove consumption energy consumption from, simplified to a certain extent bainite ductile iron production technique, reduced pollution, reduced the cost of foundry goods environment.But this technology has only by alloying elements such as the nickel that adds greater amt, molybdenum, copper, so as to changing the shape and the position of S curve, the hardening capacity of the critical cooling velocity of reduction foundry goods, expansion austenitic area, raising foundry goods could guarantee that foundry goods obtains the matrix based on bainite under the condition of slow cooling continuously.Being generally the alloy quantity that obtains the palpus adding of as-cast bainite tissue institute is: 1.0～2.5%Ni, 0.5～1.0%Mo, 0.5～2.0%Cu.Obviously, the consumption of increasing nickel-molybdenum alloy certainly will make the goods and materials that just are tending towards in short supply originally more in short supply; And, to compare with Ao-Bei magnesium iron through isothermal quenching, the mechanical performance index of as-cast bainite magnesium iron comparatively disperses, and aggregate level is also lower.Therefore, though as-cast bainite magnesium iron result of study report existing quite a lot so far, it is very few really to be used for industrial achievement.
ZL 92 1 02824.5 patents of invention have been announced a kind of Low Carbon Ductile Iron, utilization contains super hypoeutectic low-carbon-equivalent (the CE ≈ 1.8-2.6%) molten iron of 1.2-2.2%C, 1.8-2.4%Si, the Sx alterant that process is made up of a little anti-nodularization surface active elements of generally acknowledging goes bad after the processing, under as-cast condition, obtain a kind of tissue and form, have novel magnesium iron concurrently than high-mechanical property by graphite pebbles and perlite tiny, rounding.This material is applied in machinery, metallurgy, building materials, automobile and other industries so far, has following characteristics:
1. make and contain
1.2-2.2%
CIron-carbon obtained rational development and use, filled up the blank that this iron-carbon that contains carbon range is used on industrial production.Available steel scrap more than 70% replaces low-sulfur, low-phosphorous high duty pig iron in its production method, has avoided the dependence of traditional spheroidal graphite cast iron production to high duty pig iron; The comparable traditional magnesium iron with performance of its comprehensive production cost reduces more than 20%.
2. started spheroidal graphite cast iron is produced in direct utilization " anti-nodularization surface active element " under as-cast condition the beginning in the cast iron field of metallurgy.Fundamentally clarified the nodularization of surface active element and the problem that anti-spheroidization can transform mutually under certain condition, the nodularization theory of graphite in traditional spheroidal graphite cast iron has been played revise and improve effect preferably.
3. its production technique adopts the energy of cleaning, replaces cupola melting with electric furnace, has reduced the pollution to environment, make the easier accurate control of alloying constituent and smelting temperature, molten iron is purer, and metallurgical quality improves greatly, and the flowability of molten iron has obtained abundant assurance.
4. globular graphite and higher mechanical properties all can obtain under the condition in as cast condition and get, and adopt the as cast condition technology generations to replace the thermal treatment of energy-consuming consumptive material.This not only greatly reduces energy consumption and to the pollution of environment, and production cost is obviously reduced.
5. have forge hot characteristic preferably, its blank bar can relatively easily forge and press the mechanical component that become other shape in certain temperature range.
Although Low Carbon Ductile Iron has above-mentioned various advantages, up to now, Low Carbon Ductile Iron generally still is confined to the single a kind of weave construction form of pearlite matrix.Its performance index aggregate level is also unsatisfactory, under some abominable industrial and mineral condition, and its obdurability, it is not enough far away that wear resistance also seems; As must further improving its obdurability or wear resistance, have to adopt more alloying element of adding or complicated heat treatment to be finished, production cost is increased.Manage not only to keep Low Carbon Ductile Iron various advantages, but also can utilize simple, inexpensive processing method to obtain austenite-bainite structure, give its higher obdurability and comprehensive mechanical performance, big area to Low Carbon Ductile Iron is promoted, and will play positive pushing effect undoubtedly.
Summary of the invention: the objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and can keep the various advantages of existing Low Carbon Ductile Iron, again high-strong toughness and comprehensive mechanical performance, the simple accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron of production technique and preparation method thereof arranged.
Technology contents of the present invention is: the matrix of accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron is to be the heterogeneous structure of assisting based on bainite, austenite, be uniform-distribution with graphite pebbles tiny, rounding on the metallic matrix, its chemical ingredients is (mass percent): 1.2～2.2%C, 2.0～2.8%Si, 0.8～1.6%Mn, 0.3～0.6%Cr, 0.3～0.8%Cu, P＜0.1%, S＜0.1%, Sx alterant 0.4～0.7%, surplus are Fe.The Sx alterant is to utilize surface active element Pb, Cr, Sb, Bi, Ti, Al, the central whole or several elements of B to found, pulverize the master alloy (concrete element and content are determined according to the practical situation such as different requirements of part performance, casting dimension size, service condition) that forms by a certain percentage together with Si, Mn, Fe etc.
The production method of this accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron is to utilize to contain 1.2～2.2%C, 2.0～2.8%Si, the low-carbon-equivalent molten iron, through more low-level Mn-Si-Cr-Cu Alloying Treatment, obtain low-alloy Low Carbon Ductile Iron molten iron (making the low-carbon-equivalent molten iron of handling without traditional nodulizing agent such as rare earth or magnesium just can separate out the method for globular graphite in as cast condition) again after the rotten processing of Sx alterant, the Sx alterant of its use is to utilize surface active element Pb, Cr, Sb, Bi, Ti, Al, whole or several elements in the middle of the B by a certain percentage with Si, Mn, Fe etc. found together, pulverizing forms.(see patent of invention: ZL 92 1 02824.5.Its add-on is 0.4～0.7%, and according to the different requirements of part performance, casting dimension size, service condition, the composition of Sx alterant and add-on can be adjusted.Add molten iron after normally founding into master alloy with Si, Mn, Fe etc. and being crushed into the particle of φ 0.5～1.5mm) with a certain proportion of above-mentioned surface active element; The quasi-as-cast bainite technology that molten iron cast back is incubated with hot shake-out, controlled chilling, immediate quenching and bainite transformation temperature, obtain being uniform-distribution with on Ao-Bei matrix accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron tiny, the rounding graphite pebbles, its salient features is σ b 856-934Mpa, δ 5 6-10%, α k 14-22J/cm
2
Quasi-as-cast bainite technology is: according to cast iron solidified performance graph, control foundry goods in sandbox cooling time and the cooling time in the hardening liquid, when being cooled to 880～920 ℃, its major portion carries out the hot shake-out knockout (before beginning to produce in batches, utilize the multiple spot electron potentiometer, measure different size, the wall thickness foundry goods is put into foundry goods the performance graph that solidifies when specifying the heat-eliminating medium cooling solidifying behind performance graph and the shake out in disappearance sand case under the same teeming temperature, again according to concrete foundry goods solidify performance graph accurately control this casting pouring postcooling to specify shakeout temperature institute must cooling time, and in heat-eliminating medium, be cooled to behind the shake out bainite transformation temperature time of palpus); Again according to casting temperature that solidifies the performance graph reflection and the relation of cooling time, control its liquid temperature of quenching the cooling time in heat-eliminating medium (be hardening liquid: as through rotten water glass, polyvinyl alcohol, quenching wet goods) by the control foundry goods and carry out immediate quenching, when being cooled to 320～360 ℃ bainite transformation temperature, from heat-eliminating medium, takes out on foundry goods, utilize the lagging facility (electric furnace, insulation can etc.) that is warmed up to the bainite transformation temperature in advance to be incubated 1.5～2 hours again, make foundry goods carry out bainite transformation (or austenite-bainite transformation).
The present invention makes full use of the coagulating property of Low Carbon Ductile Iron self, by the quasi-as-cast bainite technology that fully is incubated under hot shake-out, controlled chilling, immediate quenching and the bainite transformation temperature behind the casting pouring, the matrix of Low Carbon Ductile Iron is more stably changed into be organized as main, austenite and be the heterogeneous structure of assisting, thereby the obdurability of cast iron and wear resistance are greatly improved with shellfish.This technology is serious when both having overcome traditional Ao-Bei magnesium iron isothermal quenching consumption energy consumption, the shortcoming of Technology complexity; Avoided pure as cast condition process performance index to disperse again, aggregate level is lower, and the nickel-molybdenum-copper alloy that need add more costliness makes the deficiency of production cost increase.Its maximum characteristics are directly to utilize the high-temperature residual heat behind the casting pouring, shake out makes foundry goods cold soon under the fixed temperature (time) giving, be incubated processing immediately when being cooled to give the fixed time (temperature), it is being added than low level, comparatively cheap Mn-Si-Cr-Cu alloy, and behind cancellation high temperature austenite heating and salt made from earth containing a comparatively high percentage of sodium chloride salt bath austempering, still can realize the transformation of Ao in the cast iron-Bei tissue preferably.Have simple and reliable process, less energy-consumption, low cost, be convenient to advantages such as industrialization promotion application.
Description of drawings:
Accompanying drawing is a process flow sheet of the present invention.
Embodiment:
Below in conjunction with drawings and Examples essence of the present invention is described further.
Embodiment 1: quasi-as-cast bainite Low Carbon Ductile Iron ball mills
Starting material: local cast iron, steel scrap, 75 ferrosilicon, ferromanganese, ferrochrome, electrolytic copper.
Matrix is to be the heterogeneous structure of assisting based on bainite, austenite, is uniform-distribution with graphite pebbles tiny, rounding on the metallic matrix.Chemical ingredients is (mass percent): 1.4%C, 2.8%Si, 1.2%Mn, 0.3%Cr, 0.3%Cu, 0.08%P, 0.06%S, Sx alterant 0.5% (contain Si 35%, Mn 5%, Cr 2%, Sb 1%, Bi 1%, Ti 2%, Al 2%, B 1% in the alterant, all the other are iron), surplus is Fe.
Specific embodiment is:
1, utilize the vacuum full mold casting technology to produce the iron ball mould.
The vacuum full mold casting technology claims sublimation pattern casting method again, is called for short the EPC method.This technology must the moulding mould assembly and is added complex operations such as plug, and foundry goods complexity and casting material are not limited by casting technique, and it is accurate to have a casting dimension, surface smoothness height, advantage such as machining allowance is little, and the internal quality of casting is good, and production cost is low.This technology can be made foundry goods such as crankshaft of diesel engine, camshaft, cylinder sleeve, ball mills, liner plate, grinder hammerhead, rolling mill guide plate, and the metallic substance that can cast has cast iron, cast steel, non-ferrous metal etc.The present invention is at first according to the abrading-ball size, and design iron ball mould of plastics foams and makes the baton round and the gating system model of different size;
2, plastic mold bonding assemble, coat, oven dry, vanning, plastic covering film, towards fill out dry sand, dead head is set, vacuumize etc. to be cast;
3, Low Carbon Ductile Iron batching, melting, be adjusted to and be divided into 1.4%C, 2.8%Si, and carry out more low-level low alloying and handle; Overheating insulation, molten iron are come out of the stove then, the Sx alterant with 0.5% (contain Si 35%, Mn 5%, Cr 2%, Sb 1%, Bi 1%, Ti 2%, Al 2%, B 1% in the alterant, all the other are iron), and the abrading-ball foundry goods is poured into a mould in the processing of going bad again.When pouring into a mould for the first time, at first measure the different diameter abrading-ball and in disappearance sand case, solidify performance graph.
4, according to solidify performance graph carry out the conversion of temperature-time (the control foundry goods at the cast postcooling to the cooling time of specifying shakeout temperature institute palpus, and in heat-eliminating medium, be cooled to behind the shake out bainite transformation temperature must time), when being cooled to 880 ℃ in sandbox, abrading-ball carries out shake out, utilize water glass quenching, foundry goods to be cooled to 320 ℃ and from water glass, to take out then, foundry goods is put into the electric furnace insulation 1.5 hours, the insulation end taking-up air cooling that are warmed up to 320 ℃ in advance arrive room temperature through the processing of going bad.
Embodiment 2: quasi-as-cast bainite Low Carbon Ductile Iron grinder hammerhead
Starting material: local cast iron, steel scrap, 75 ferrosilicon, ferromanganese, ferrochrome, electrolytic copper
Matrix is to be the heterogeneous structure of assisting based on bainite, austenite, is uniform-distribution with tiny, rounding graphite pebbles on the metallic matrix.Chemical ingredients is: 1.2%C, 2.4%Si, 1.6%Mn, 0.4%Cr, 0.6%Cu, 0.07%P, 0.06%S, Sx alterant 0.4% (contain Si 42%, Mn 6%, Cr 2%, Sb 1%, Pb 1%, Ti 1%, Al 2%, B 1% in the alterant, all the other are iron), surplus is Fe.Specific embodiment is:
1, produces grinder hammerhead mould, cast set-up procedure with example 1;
2, Low Carbon Ductile Iron batching, melting, be adjusted to and be divided into 1.2%C, 2.4%Si, and carry out more low-level low alloying and handle; Overheating insulation, molten iron are come out of the stove then, Sx alterant with 0.4% (contain Si 42%, Mn 6%, Cr 2%, Sb 1%, Pb 1%, Ti 1%, Al 2%, B 1% in the alterant, all the other are iron), processing, castable grinder hammerhead foundry goods again go bad.When pouring into a mould for the first time, at first measure the different size grinder hammerhead and in disappearance sand case, solidify performance graph.
3, carry out temperature-time conversion according to solidifying performance graph, carry out shake out when grinder hammerhead is cooled to 920 ℃ in sandbox and (solidify performance graph according to grinder hammerhead, determine that grinder hammerhead cools off 920 ℃ of institute's palpus times in sandbox, can carry out shake out according to this time), utilize polyvinyl alcohol quenching, foundry goods to be cooled to 360 ℃ and from water glass, to take out then, foundry goods is put into the electric furnace insulation 2 hours, the insulation end taking-up air cooling that are warmed up to 360 ℃ in advance arrive room temperature.
Embodiment 3: bainite Low Carbon Ductile Iron rolling mill is turned round conduit
Starting material: local cast iron, steel scrap, 75 ferrosilicon, ferromanganese, ferrochrome, electrolytic copper
Matrix is to be the heterogeneous structure of assisting based on bainite, austenite, is uniform-distribution with tiny, rounding graphite pebbles on the metallic matrix.Chemical ingredients is: 1.8%C, 2.2%Si, 0.8%Mn, 0.6%Cr, 0.5%Cu, 0.05%P, 0.06%S, Sx alterant 0.7% (contain Si 38%, Mn 8%, Pb 1%, Cr 2%, Sb 1%, Bi 1%, Ti1%, Al 2%, B 1% in the alterant, all the other are iron), surplus is Fe.
Specific embodiment is:
1, produces rolling mill and turn round catheter mold, cast set-up procedure with example 1;
2, Low Carbon Ductile Iron batching, melting, be adjusted to and be divided into 1.8%C, 2.2%Si, and carry out more low-level low alloying and handle; Overheating insulation, molten iron are come out of the stove then, Sx alterant with 0.7% (contain Si 38%, Mn 8%, Pb 1%, Cr 2%, Sb 1%, Bi 1%, Ti 1%, Al 2%, B 1% in the alterant, all the other are iron), the processing of going bad, the castable rolling mill is turned round the conduit foundry goods again.When pouring into a mould for the first time, at first measure the different size rolling mill and turn round conduit and in disappearance sand case, solidify performance graph;
3, rolling mill is turned round and is carried out shake out when conduit is cooled to 900 ℃ in sandbox and (turn round conduit according to rolling mill and solidify performance graph, determine rolling mill turn round conduit in sandbox, cool off 900 ℃ of institutes must the times, can carry out shake out according to this time), utilize quenching oil quenching, foundry goods to be cooled to 340 ℃ and from quenching oil, to take out then, foundry goods is put into the electric furnace insulation 2.0 hours, the insulation end taking-up air cooling that are warmed up to 340 ℃ in advance arrive room temperature.
Embodiment 1 abrading-ball The performance test results is:
| The wearing and tearing test piece number (Test pc No.) | 1# | 2# |
| Original weight | 22.5799g | 22.4036g |
| The weight after 5 hours of wearing and tearing | 22.4138g | 21.5171g |
| Weightless | 0.1661g | 0.8965g |
| Impelling strength | 12-17J/cm 2 | 4-7J/cm 2 |
Wear test is got 3 samples for every group, first pre-grinding is 1 hour before the wearing and tearing, clean the back oven dry with dehydrated alcohol, acetone then, on ten thousand/optical electrobalance, weigh as original weight, after this sample is installed to unified the wearing and tearing 8 hours on the LMD-10 moving load abrasive wear experimental machine, take off after having ground with dehydrated alcohol, acetone and clean the back oven dry, on ten thousand/optical electrobalance, measure sample weightlessness.Experimental data is the mean value of 3 samples.The wearing and tearing sample: specimen size is (10 * 10)
-0.03* 30mm, 1#-take from the Low Carbon Ductile Iron abrading-ball through the bainite isothermal processes, and 2#-takes from domestic typical low chromium alloy iron casting abrading ball; The impelling strength sample: specimen size is (10 * 10)
± 0.05Mm, numbering is with the wearing and tearing sample.
Impact the contrast experiment with typical low chromium alloy iron casting abrading ball with forging on the pneumatic hammer through the Low Carbon Ductile Iron abrading-ball of bainite isothermal processes, low chromium alloy iron casting abrading ball is forging impact fragmentation in 30 seconds on the pneumatic hammer as a result, and accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron abrading-ball impacts only broke a breach (because pneumatic hammer is smashed not down experiment again) in 3 minutes 20 seconds.Above-mentioned experimental result shows, the withstand shocks wear loss of wearing and tearing of accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron abrading-ball is typical low chromium alloy iron casting abrading ball 1/6, and the percentage of damage under pneumatic hammer impact condition is less than typical low chromium alloy iron casting abrading ball 1/6.
Claims (5)
1. accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron, be uniform-distribution with graphite pebbles tiny, rounding on the matrix, it is characterized in that its matrix is is the heterogeneous structure of assisting based on bainite, austenite, chemical ingredients is: 1.2～2.2%C, 2.0～2.8%Si, 0.8～1.6%Mn, 0.3～0.6%Cr, 0.3～0.8%Cu, P＜0.1%, S＜0.1%, Sx alterant 0.4～0.7%, surplus is Fe.
2. accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron according to claim 1 is characterized in that the Sx alterant is that the master alloy that forms is founded, pulverized to whole or several elements in the middle of surface active element Pb, Cr, Sb, Bi, Ti, Al, the B with Si, Mn, Fe by a certain percentage.
3. the production method of the accurate as cast condition Low Carbon Ductile Iron of the described accurate as cast condition high-strong toughness bainite of claim 1, to contain 1.2～2.2%C, 2.0～2.8%Si, the low-carbon-equivalent molten iron of CE ≈ 2.0-2.8%, through more low-level Mn-Si-Cr-Cu Alloying Treatment, after the rotten processing of Sx alterant, obtain low-alloy Low Carbon Ductile Iron molten iron again, it is characterized in that the low-carbon-equivalent molten iron after the Sx alterant is handled must not carry out inoculation again, after directly pouring into a mould, utilize quasi-as-cast bainite technology to obtain matrix and add austenite, be uniform-distribution with tiny above for bainite, the rounding graphite pebbles high-strong toughness bainite Low Carbon Ductile Iron.
4. the production method of accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron according to claim 3, it is characterized in that quasi-as-cast bainite technology is: according to the performance graph that solidifies of low-alloy Low Carbon Ductile Iron particular wall thickness foundry goods, the control cooling time of foundry goods in sandbox and the cooling time in heat-eliminating medium, when being cooled to 880～920 ℃ in sandbox, its major portion carries out the hot shake-out knockout, utilize heat-eliminating medium to carry out immediate quenching then, the bainite transformation temperature that makes foundry goods be cooled to 320～360 ℃ is taken out from heat-eliminating medium, utilize the lagging facility that is warmed up to the bainite transformation temperature in advance to be incubated 1.5～2 hours again, make foundry goods carry out bainite-austenitic transformation.
5. according to claim 3 or 4 described accurate as cast condition high-strong toughness bainite Low Carbon Ductile Iron, it is characterized in that the Sx alterant is to utilize the whole or several elements in the middle of surface active element Pb, Cr, Sb, Bi, Ti, Al, the B to found, pulverize and form with Si, Mn, Fe by a certain percentage.
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| CN102921932A (en) * | 2012-11-21 | 2013-02-13 | 宁夏共享集团有限责任公司 | High-temperature shakeout process method of large-scale Bainite steel casting |
| CN103225036A (en) * | 2013-05-20 | 2013-07-31 | 辽源市金城重型选矿机械有限公司 | Boron-carbide-reinforced wear-resistant bainite ductile iron grinding ball and manufacturing method thereof |
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| CN1043754A (en) * | 1988-12-21 | 1990-07-11 | 机械制造工艺科学生产联合公司 | Spheroidal graphite cast iron |
| US5043028A (en) * | 1990-04-27 | 1991-08-27 | Applied Process | High silicon, low carbon austemperable cast iron |
| CN1117529A (en) * | 1994-08-26 | 1996-02-28 | 孔繁印 | Bainite alloy wear-resistant cast ball, lining board, production process and equipment |
| CN1116434C (en) * | 2001-02-20 | 2003-07-30 | 上海交通大学 | Nodular eutectic austenite steel base authigenic composite material |
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| CN109112389A (en) * | 2018-10-10 | 2019-01-01 | 武汉纺织大学 | A kind of cooling technique for preparing austenic globe body of control |
| CN110373602A (en) * | 2019-07-31 | 2019-10-25 | 游峰 | A kind of master alloy additive and the preparation method and application thereof |
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