CN1147022A - High strength and wear-resistant copper complex alloy ductile iron and its use - Google Patents
High strength and wear-resistant copper complex alloy ductile iron and its use Download PDFInfo
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- CN1147022A CN1147022A CN 95113773 CN95113773A CN1147022A CN 1147022 A CN1147022 A CN 1147022A CN 95113773 CN95113773 CN 95113773 CN 95113773 A CN95113773 A CN 95113773A CN 1147022 A CN1147022 A CN 1147022A
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Abstract
A high-strength, high-antiwear Cu-base complex alloy type of nodular cast iron, which can be used to manufacture cold roller by special casting process to increase service life by 1.5-3 times and metallic utilization rate by 30% and reduce cost by 50%, features that its Cu content is increased to 1.2-2.4% to obviously raise the dispersity of eutectoid and present ultramicroscopic copper inclusion body insoluble in ferrite and the high-Cu (greater than 35%) rare earth -Mg-Si is used as nodulizer during smelting.
Description
The present invention relates to a kind ofly take many alloy nodular cast iron materials of element as the leading factor and in the application aspect the continuous production Welded Steel Pipe with copper.
At present, the used cold roll of domestic welded tube industry is selected GCr15.40NiCrMo, 9SiCr 9Cv mostly for use
2Bearing steel or alloy tool steels such as Mo, its traditional operational path are steel ingot-forge-cut-rough forge moulding-annealing-rough turn-quenching+tempering-correct grinding.This technology not only the production cycle long, and more complicated, using rate of metal is only about 40%.Because steel grade character, to fall piece, fracture more in the use and scrap, recoverability is poor.
In recent years also select advanced Cr both at home and abroad for use
12The steel grade of MoV, (the Japanese trade mark is KD11), the technological process and the above-mentioned steel grade of the colod-application tool steel of this kind high-carbon high-alloy are approaching, but cost is high, with its import roll price of making up to 20,000 dollars/T.
Chinese patent CN1060501A, CN1060502A disclose the high-alloy wear-resisting steel of a kind of Cr23 of containing～32%, Ni7～8% and the application method on cold roller.This method mainly changes original forging steel billet into cast steel, has suitably reduced thermal treatment temp, and production technique is simplified relatively, but it still belongs to high alloy steel rider series, except that higher cost is arranged, in use once finds steel tube surface cut problem.
It is to be main alloy series with Ni-Cr-Mo that China Bureau of Technical Supervision has implemented " grain roll " technological standard (GB/T1504-91) on May 1st, 1992 issue, wherein also comprise the Cr-Mo-Xu alloy series, but Cu content is all below 1%, and this standard is formulated at the application conditions of hot roll.
The present invention is directed to the deficiency of above-mentioned prior art, and the application blank of domestic alloy nodular cast iron aspect cold roll, aim to provide a kind of high-strength abrasion-proof ductile cast iron material with the copper alloy guide element, be applicable to the cold roll of welded tube unit with the castmethod manufacturing of indefinite chill, and a kind of production technique of above-mentioned cold roll is provided simultaneously.
According to the magnesium iron alloying principle and experimental results show that, the Cu element is similar to the Ni element to the influence of cast iron, the Cu element is its colony structure of refinement not only, and after Cu 〉=1～1.2%, significantly improve eutectoid product dispersity, occur being insoluble to ferritic submicroscopic copper-clad compound, the latter plays self-lubricating function.Under special chill condition, its chill tissue is made of " bainite+martensite+ledeburite ", than single cementite tissue higher strength property is arranged.
Ductile cast iron material Chemical Composition weight percent of the present invention is:
C2.9～3.5?Si0.6～1.8 Mn0.2～0.8 P≤0.15
S≤0.03 Cu1.2～2.4 Cr0.4～1.2 Mo0.2～0.8
Mg≤0.04 Re≤0.02 surplus is an iron.
When the above-mentioned materials composition was applied in some specification cold roll, copper content also can be reduced to 0.6%.Obviously, any those skilled in the art can do suitably increase and decrease at part model of material of the present invention, and are applied to cold roll, such as with the partly or whole Alloy instead of Copper of Ni, or reduce alloy ingredient and increase alloying elements such as a small amount of W, V, but it still belongs in the scope of the invention.
Make the technical process such as the accompanying drawing 1 of cold roll with material of the present invention.Except the conventional production process operative technique, the present invention has following characteristics:
(1) contains the Cu rare earth magnesium ferrosilicon alloy with the height of the special Cu of containing＞35% and make nodulizing agent.
(2) add before cast with 0.2～0.3 ferrosilicon and make to float the silicon instant inoculation in the bag.
(3) rolling face is all used shape-copying frozen iron, and chill thickness equates with roll thickness.50～100 ℃ of cold mould temperature.
(4) pour into a mould in back 20～40 minutes according to roll weight pine oil chill mould.
Go up below (5) 600 ℃ and unpack, to prevent the temper brittleness district in 400～500 ℃ of stages.
(6) 200～280 ℃ of low temperature stress annealings require different roll models to solve by improving annealing temperature or " 900 ℃ of normalizing+different tempering temperatures " to some hardness.
Cast iron materials of the present invention is chill organizes hardness up to 70～87HSD, matrix strength 6b450～670N/mm
2, α k 〉=8.5j/cm
2This material is aided with chill roll and the GCr15 that technology of the present invention produces and is contrasting under equal working conditions, and the life-span is improved 1.5～3 times.Using rate of metal improves 30%, and production cost reduces more than 50%, because the self-lubricating function of copper-clad compound and nodularization graphite, obviously having improved steel tube surface quality and had can reparation property.
Material of the present invention also can be applicable to hot roll.
Description of drawings:
Fig. 1 is a process flow sheet of making cold roll with material of the present invention.
Fig. 2 is the chill graphite pebbles form of organizing of material of the present invention.* 100 not etches.Graphite pebbles is tiny, rounding, even.
Fig. 3 is material of the present invention * 500 times 3% nitric acid, spills smart etch, and the chill metallograph of organizing is made up of " martensite+bainite+ledeburite+globular graphite ".Measuring hardness is Rc62.
Fig. 4 is that macrostructure (* 100) ledeburite of Fig. 2 is spicule, perpendicular to body of roll work, good wear resistance is arranged.
Embodiment:
Batching: steel scrap 20%, 10
#The pig iron 25%, 14
#The pig iron 45%, magnesium iron foundry returns 10%.Spheroidizing: height contains Cu rare earth ferrosilicomagnesium nodulizing agent 1.4%.Nucleating agent: bag adds floating silicon 0.2% before adding 0.3% cast the end.
Cupola melting, alloy is allocated into: surplus part in Cu2.0%, the adding bag, Mo-Fe allocates into by composition 0.3%, after being added in stove (by scaling loss 25%), stop 7 fens kinds after 1360 ℃ of nodularizations of tapping temperature, open and water 1320 ℃ of temperature, be 30 seconds/580kg molten iron the duration of pouring.Unpacking 650～700 ℃, 280 ℃ stress annealings of casting temperature.Finished product Chemical Composition: (weight percent)
C3.4?3％ Si1.72％ Mn0.61％ P0.08％ S0.012％Mg?0.035％ Re0.025％?Cu1.92％ Mo0.27％?Cr0.82％。
Fig. 2, Fig. 3 are seen in chilling layer hardness: Rc62, its metallographic structure.Matrix tensile strength 6
b67kg/mm
2, α k=14j/cm
2(being taken to the chill sample of 45 thick special uses).
Claims (5)
1, a kind of high-strength, high-anti-friction ductile cast iron material is characterized in that elementary compositionly being:
C2.9～3.5 Si0.6～1.8 Mn0.2～0.8 P≤0.15
S≤0.03 Cu1.2～2.4 Cr0.4～1.2 Mo0.2～0.8
Mg≤0.04 Re≤0.025 surplus is an iron.
2, ductile cast iron material according to claim 1 is characterized in that the Cu element can partly or entirely be replaced by the Ni element.
3, a kind of smelting process of above-mentioned spheroidal graphite cast iron, its feature are made nodulizing agent to contain Cu greater than the rare earth ferrosilicomagnesium of 35% high copper component when nodularization.
4, a kind of purposes of above-mentioned spheroidal graphite cast iron is characterized in that it as making the used complete cold roll of Welded Steel Pipe production line.
5, a kind of above-mentioned ductile cast iron material is made the casting and molding method of cold roller roller, it is characterized in that the cold roll working face all utilizes the moulding of curved surface shape-copying frozen iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95113773 CN1147022A (en) | 1995-03-21 | 1995-10-26 | High strength and wear-resistant copper complex alloy ductile iron and its use |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95103136 | 1995-03-21 | ||
| CN95103136.8 | 1995-03-21 | ||
| CN 95113773 CN1147022A (en) | 1995-03-21 | 1995-10-26 | High strength and wear-resistant copper complex alloy ductile iron and its use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1147022A true CN1147022A (en) | 1997-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 95113773 Pending CN1147022A (en) | 1995-03-21 | 1995-10-26 | High strength and wear-resistant copper complex alloy ductile iron and its use |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011044A (en) * | 2010-12-15 | 2011-04-13 | 安徽省宁国耐磨配件总厂 | Continuous-casting martensitic spheroidal graphite cast iron lining plate and machining process thereof |
| CN103952617A (en) * | 2014-05-14 | 2014-07-30 | 扬州大学 | Novel Austempered ductile iron train wheel material alloy and melting technique thereof |
| CN108311655A (en) * | 2018-05-11 | 2018-07-24 | 铜陵市大成轧辊有限责任公司 | A kind of centre spinning method of bar mill shaping roll |
| CN108504921A (en) * | 2018-07-03 | 2018-09-07 | 宁波力古机械制造有限公司 | A kind of oil-free machine rotor seat and preparation method |
| CN108774707A (en) * | 2018-07-03 | 2018-11-09 | 宁波力古机械制造有限公司 | A kind of motor rotor and manufacturing method |
| CN111349843A (en) * | 2020-04-14 | 2020-06-30 | 常州凯达重工科技有限公司 | High-strength alloy nodular cast iron roughing roll and production process thereof |
| CN111926239A (en) * | 2020-10-16 | 2020-11-13 | 常州凯达重工科技有限公司 | High-strength high-hardness troostite ductile iron section steel roll and manufacturing method thereof |
-
1995
- 1995-10-26 CN CN 95113773 patent/CN1147022A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011044A (en) * | 2010-12-15 | 2011-04-13 | 安徽省宁国耐磨配件总厂 | Continuous-casting martensitic spheroidal graphite cast iron lining plate and machining process thereof |
| CN102011044B (en) * | 2010-12-15 | 2014-08-27 | 安徽省宁国耐磨配件总厂 | Continuous-casting martensitic spheroidal graphite cast iron lining plate and machining process thereof |
| CN103952617A (en) * | 2014-05-14 | 2014-07-30 | 扬州大学 | Novel Austempered ductile iron train wheel material alloy and melting technique thereof |
| CN108311655A (en) * | 2018-05-11 | 2018-07-24 | 铜陵市大成轧辊有限责任公司 | A kind of centre spinning method of bar mill shaping roll |
| CN108504921A (en) * | 2018-07-03 | 2018-09-07 | 宁波力古机械制造有限公司 | A kind of oil-free machine rotor seat and preparation method |
| CN108774707A (en) * | 2018-07-03 | 2018-11-09 | 宁波力古机械制造有限公司 | A kind of motor rotor and manufacturing method |
| CN111349843A (en) * | 2020-04-14 | 2020-06-30 | 常州凯达重工科技有限公司 | High-strength alloy nodular cast iron roughing roll and production process thereof |
| CN111926239A (en) * | 2020-10-16 | 2020-11-13 | 常州凯达重工科技有限公司 | High-strength high-hardness troostite ductile iron section steel roll and manufacturing method thereof |
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