CN1024690C - High-chromium alloy cast iron, its hot treatment process and application - Google Patents

High-chromium alloy cast iron, its hot treatment process and application Download PDF

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Publication number
CN1024690C
CN1024690C CN 89108897 CN89108897A CN1024690C CN 1024690 C CN1024690 C CN 1024690C CN 89108897 CN89108897 CN 89108897 CN 89108897 A CN89108897 A CN 89108897A CN 1024690 C CN1024690 C CN 1024690C
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China
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iron
thermal treatment
alloy cast
chromium alloy
cast iron
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CN 89108897
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CN1042193A (en
Inventor
孙熙柱
江静波
黄金洪
张立汉
李侨英
陶云祥
罗锐
李洪清
李志学
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KUNMING IRON AND STEEL WORKS
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KUNMING IRON AND STEEL WORKS
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Abstract

The present invention relates to wear-resistant and heat-resistant high chrome alloy cast iron and a unique heat treatment process thereof, and the material is used for producing a pipe mill forcer. The cast iron of the present invention comprises the components of 2.85 to 3.40 wt% of C, 0.8 to 1.50 wt% of Si, 0.30 to 0.40 wt% of Mn, at most 0.02 wt% of S, at most 0.03 wt% of P, 25 to 38 wt% of Cr, 3 to 8 wt% of Ni, 0.08 to 0.15 wt% of RE, and Fe as the rest. The heat treatment is carried out twice, the temperature of the first heat treatment is from 1100 to 1300 DEG C, and the cast iron is cooled by air after being discharged; the temperature of the second heat treatment is from 1000 to 1250 DEG C, and the cast iron is slowly cooled. The components and the technology of the present invention are reasonably designed according to specific requirements of tools and workpieces, such as pipe mill forcers, perforator guide plates, etc., and good functions of rare earth are exerted.

Description

High-chromium alloy cast iron, its hot treatment process and application
The height that the present invention relates to a kind of antiwear heat resisting irons cast alloy iron, and the thermal treatment process of this high-chromium alloy cast-iron, and this material is used to make tube rolling mill with coming directly towards.
High-chromium alloy cast-iron is a kind of good high-abrasive material, and its range of application constantly enlarges, and kind, specification and expense increase.The development of rich chromium cast iron will be selected alloy ingredient according to the service condition and the performance requriements of concrete parts, formulates its production technique, particularly thermal treatment process.
In industries such as metallurgy, some bodies, instrument, liner plate etc. are arranged, not only requiring has high wear resistance, and high thermotolerance will be arranged.In hot rolled seamless steel tube production, very heavy working stress is undertaken in the top of tube rolling mill, and heated metal is surrounded again, and service condition is very abominable.The top is the key instrument that tube rolling quality and tube rolling productivity is all had great effect, requires material that good wear resistance, hardness, intensity and flexible rational Match are at high temperature arranged, and metallographic structure in using, performance do not change.Particularly domestic producers because the layout of tapping machine and tube rolling mill is not too appropriate, cause steel pipe temperature when entering tube rolling mill on the low side, have strengthened the working load of top, and are harsher to the requirement of top material capability.And for example guide plate of perforating machine also is one of main stressed member, very easily wearing and tearing.Pipe high speed rotating under the roll effect advances, rotational pressure, extending pressure and frictional force effect when guide plate is subjected to the pipe distortion, and it is worth 30% of suitable rolling load.Be heated to the pipe more than 1250 ℃ during perforation, rotate on guide plate and advance, produce high temperature friction, the instantaneous temperature of its contact part can be raised to about 500~1000 ℃.In addition, also to bear repeatedly chilling and shock heating.So the guide plate material also must have excellent high-temperature hardness, hot strength, high-temperature oxidation resistance, wear resistance and anti-chilling and shock heating etc.
Rare earth element is effective alterant.Studies have shown that, rare earth can also can make carbide more be tending towards the upright bulk of arc by refinement primary austenite dendrite, helps the raising of toughness and resistance to compression bending strength, and the rare earth that is added has certain solubleness in matrix, cause lattice distortion after being dissolved in austenite, hardness is increased.Add rare earth in the high-chromium alloy cast-iron, also can improve the alloy high-temp mechanical property, increase resistance of oxidation, and grain coarsening when stoping high temperature.China's rare earth resources is abundant, should note bringing into play the effect of rare earth in high-chromium alloy cast-iron.Commercial name is called West Germany's high-chromium alloy cast-iron of Panfanax, and its composition is (weight percent): C2.6~3.1, Si0.8~1.2, and Mn0.7~1.0, Cr27.0~30.0, Ni2.0~2.3 wherein do not add rare earth element.Deutsches Wirtschafts Patent document DLI40362 has reported the cast alloy iron (weight percent) of following composition: C3~3.5, and Si0.6~1.5, Mn0.8~1.5, Cr23~27, Ni3~3.5, Ti0.6~1 does not wherein add rare earth element yet.
The hardness of high-chromium alloy cast-iron is relevant with chromium content with carbon.Increase carbon content and help to improve hardness, because enough carbon amounts are arranged, just can make has enough carbide reinforced phases in the alloy.Chromium does not still improve the effective elements of cast alloy iron antioxidant property, and is again the strong carbide forming element, increases with chrome content, and chromium carbide becomes M 7C 3And M 23C 6Type, thereby can improve resistance to abrasion, thermostability under the heavy burden." the rare-earth and high chromium high-temperature refractory steel, " of Chinese patent application CN86106715A report though contain rare earth element and Cr30~36, Ni7~10(weight percent etc., carbon content only is 0.6~1.0.The rich chromium cast iron of Chinese patent application CN87104467 report contains rare earth element, carbon containing 1.5~2.5%, but chrome content only is 5~15%.Above-mentioned material does not all meet the requirement of parts such as making tube rolling mill top, guide plate of perforating machine, instrument.
Tube rolling mill top, guide plate of perforating machine material C r32Ni5, Cr15Ni2 commonly used at present do not contain rare earth metal, and they are shorter following work-ing life in the harsh especially situation of working conditions.
The objective of the invention is to overcome the shortcoming of prior art, be instruments such as tube rolling mill top, parts provide a kind of suitable its concrete service condition needs, high-wearing feature and stable on heating is arranged, be added with the high-chromium alloy cast-iron of rare earth element, increasing the service life, and provide its thermal treatment process and purposes.
The component of high-chromium alloy cast-iron of the present invention is (weight percent): C2.85~3.40, Si0.80~1.50, Mn0.30~0.40, S<0.02, P<0.03, Cr25~38, Ni3~8, RE0.08~0.15, and surplus is Fe.
The effect of carbon, chromium and rare earth has been previously described.Nickel can improve hardening capacity, and under as cast condition, form stable austenite structure, also limiting the pearlitic structure that wears no resistance produces, nickel at high temperature also plays stable austenite simultaneously, can improve sosoloid intensity, can improve the toughness and the thermal fatigue of steel again, suitable manganese amount and thermal treatment can improve resistance to abrasion and impelling strength.The silicon solid solution adds a certain amount of silicon and can prevent the intergranular be full of cracks in austenite, improves antioxidant property, increases the hardness and the intensity of sosoloid.
The thermal treatment process of high-chromium alloy cast-iron of the present invention is: carry out twice thermal treatment, thermal treatment temp is 1100 ℃~1300 ℃ for the first time, is incubated and comes out of the stove air cooling to room temperature after 3~8 hours.Heat treated purpose is the carbide of refinement cast structure for the first time.See Fig. 1 through structure after the thermal treatment for the first time.For the second time thermal treatment temp is 1000 ℃~1250 ℃, is incubated after 2~5 hours slow cooling to room temperature.The method of slow cooling is furnace cooling preferably.Heat treated purpose is to make to separate out tiny carbide particle in the austenite substrate for the second time, to improve workpiece thermotolerance, hardness, intensity and toughness at high temperature.See Fig. 2 through the structure after the thermal treatment for the second time, be austenite+M 7C 3+ M 23C 6, macrohardness is HRC50~55.(etchant of metallographic specimen is the iron chloride salt aqueous acid: iron trichloride 5 grams, 50 milliliters of hydrochloric acid, 100 milliliters in water).
During melting high-chromium alloy cast-iron of the present invention, use aluminium deoxidation, a part of rare earth adds in the stove, and another part rare earth adds in the hot metal ladle.Teeming temperature is controlled at 1550 ℃~1650 ℃.
Advantage of the present invention and positively effect are: according to instrument, the high-wearing feature of parts, thermotolerance particular requirements such as tube rolling mill top, guide plate of perforating machine, appropriate design alloying constituent and thermal treatment process, brought into play the good action of rare earth element, can improve the work-ing life of instrument parts greatly, become a kind of having an economic benefit and the novel material of social benefit.
Embodiment 1: the high-chromium alloy cast-iron (weight percent) of the following component of 5 stoves is refined in congruent melting: C2.85~3.1, and Si0.80~1.10, Mn0.30~0.40, S<0.02, P<0.03, Cr28~33, Ni4~6, RE0.08~0.12, surplus is Fe.
During smelting operation, by requirement of material chemical ingredients and the actual chemical ingredients of raw material, calculate required various proportion of raw materials, with ferrochrome (lumpiness less than 50 * 100 * 150mm), the nickel plate (lumpiness less than 10 * 50 * 100mm), (lumpiness is less than 50 * 50 * 100mm) for steel scrap, (lumpiness waits raw material to add intermediate frequency furnace in proportion (along with the carrying out of melting process less than 30 * 30 * 30mm) to carbon in batches, add, till adding) in batches.After the raw material fusing finishes, be incubated ten minutes.Add ferrosilicon in proportion, use SiO 2Remove slag.After five minutes, a part of rare earth adds in the stove with the aluminum strip deoxidation, and main purpose is a purifying molten iron.After 15 minutes, other a part of rare earth is added the interior molten iron interior with pouring bag of hot metal ladle fully stir well, play effects such as changing carbide volume, form, distribution and crystal grain thinning.
Adopt the cast of many casees stacking, the cast workpiece is the tube rolling mill top.25~35 seconds durations of pouring, can not be interrupted.Because rationally the add-on of control carbon and rare earth has reduced the gas in the molten iron, strengthened molten iron flowability, improved the top yield rate.Pouring the back insulation unpacked more than 10 hours.
From the cast blank of five stove high-chromium alloy cast-irons top, get 64 ball tops of being processed into Φ 64.4mm, all the other blanks are according to producing the ball top that needs are processed into Φ 63.8mm~Φ 65.0mm, and after all heat-treating by thermal treatment process of the present invention, installation is used under actual production conditions.The tracking test result: 64 new matter top tube rolling amounts are 610.65 tons, 9.54 tons of average every top tube rollings, (poling machine and tube rolling mill are the diagonal lines arrangement for 3.18 times of 3 tons of every tube rolling amounts in old material top, steel pipe temperature when entering tube rolling mill is on the low side, be about 650~950 ℃, the top working conditions is most evil bad).The chemical ingredients of old material top is (weight percent): C1.8~2.2, Si0.3~0.5, Ni3~6, Cr30~34, surplus is Fe except that S, P.
Embodiment 2: the high-chromium alloy cast-iron (weight percent) of the following component of 9 stoves is refined in congruent melting: C2.905~3.280, Si0.904~1.330, Mn0.32~0.34, S<0.02, Cr33.94~35.38, Ni5.803~6.675, RE0.080~0.130, surplus are iron.
Smelting operation, cast is identical with embodiment 1 with thermal treatment.Done 130 balls top, the tube rolling amount is 1183 tons, and 9.1 tons of average every top tube rollings are 3.03 times of old material top.

Claims (4)

1, a kind of high-chromium alloy cast-iron of antiwear heat resisting, the composition that it is characterized in that it is (weight percent): C2.85~3.40, Si0.80~1.50, Mn0.30~0.40, S<0.02, P<0.03, Cr25~38, Ni3~8, RE0.08~0.15, and surplus is an iron.
2, the thermal treatment process of high-chromium alloy cast-iron as claimed in claim 1, it is characterized in that: carry out twice thermal treatment, thermal treatment temp is 1100 ℃~1300 ℃ for the first time, be incubated and come out of the stove air cooling to room temperature after 3~8 hours, for the second time thermal treatment temp is 1000~1250 ℃, is incubated after 2~5 hours slow cooling to room temperature.
3, thermal treatment process as claimed in claim 3 is characterized in that: the mode of the slow cooling of thermal treatment for the second time is a furnace cooling.
4, high-chromium alloy cast-iron as claimed in claim 1 or 2 is used to make the tube rolling mill top.
CN 89108897 1989-11-23 1989-11-23 High-chromium alloy cast iron, its hot treatment process and application Expired - Fee Related CN1024690C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 89108897 CN1024690C (en) 1989-11-23 1989-11-23 High-chromium alloy cast iron, its hot treatment process and application

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Application Number Priority Date Filing Date Title
CN 89108897 CN1024690C (en) 1989-11-23 1989-11-23 High-chromium alloy cast iron, its hot treatment process and application

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CN1042193A CN1042193A (en) 1990-05-16
CN1024690C true CN1024690C (en) 1994-05-25

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1064413C (en) * 1996-11-21 2001-04-11 冶金工业部北京冶金设备研究院 Multicomponent alloy cast steel with excellent steel bulk resisting property
CN1069929C (en) * 1998-10-27 2001-08-22 朱同家 Superhigh-chrome wear-resistant white cast iron and its production process
CN100455378C (en) * 2006-12-21 2009-01-28 安徽省安工机械制造有限公司 Method for manufacturing high chromium white wear-resistant cast iron
CN101279522B (en) * 2008-04-25 2012-01-04 西安交通大学 Shock resistant compound material and preparation thereof
CN101619469B (en) * 2009-04-22 2012-09-05 兰州连城陇兴铝业有限责任公司 Crust-hitting hammer head for aluminum reduction cell and casting technique thereof
CN106222580B (en) * 2016-08-22 2018-07-24 合肥东方节能科技股份有限公司 A kind of high finishing mill slitting wheel alloy material and preparation method thereof
CN110257697B (en) * 2019-07-16 2021-04-09 安徽海螺川崎装备制造有限公司 High-wear-resistance and heat-resistance casting for grate plate of grate cooler and casting process of casting

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