CN102268588A - Steel pipe reducing mill or sizing mill nodular cast iron roller and preparation method thereof - Google Patents
Steel pipe reducing mill or sizing mill nodular cast iron roller and preparation method thereof Download PDFInfo
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- CN102268588A CN102268588A CN 201110168984 CN201110168984A CN102268588A CN 102268588 A CN102268588 A CN 102268588A CN 201110168984 CN201110168984 CN 201110168984 CN 201110168984 A CN201110168984 A CN 201110168984A CN 102268588 A CN102268588 A CN 102268588A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 17
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- 229910002804 graphite Inorganic materials 0.000 claims description 45
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- 235000019341 magnesium sulphate Nutrition 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
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- 238000002844 melting Methods 0.000 claims description 9
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- 229910052761 rare earth metal Inorganic materials 0.000 claims description 8
- 150000002910 rare earth metals Chemical class 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a steel pipe reducing mill or sizing mill nodular cast iron roller and a preparation method thereof. According to the invention, better mechanical properties than the conventional heat treated nodular cast iron roller are obtained by adopting a reasonable component ratio and a nickel free scheme, reducing component compositions of other alloy contents in the nodular cast iron roller and carrying out isothermal quenching by adopting a two-step method, so that the strength and the toughness of the nodular cast iron roller are greatly increased; the wear resistance of the nodular cast iron roller achieves the level of the traditional high-nickel sizing and reducing the alloy nodular cast iron roller through laboratory experiments and installation use; and the actual needs of production are met. The use and consumption of precious metals are reduced and the costs of manufacture and use are minimized.
Description
Technical field
The present invention relates to the roll casting technology field, relate in particular to seamless steel tube reducing machine or sizing mill spheroidal graphite roll and preparation method thereof.
Background technology
The tube reducing of weldless steel tube or sizing process are the not multimachine frame continuous rolling process of cored bar of steel pipe.Sizing is rolling for the precision of finishing steel pipe sizes and out of roundness, and tube reducing requires reducing rate bigger except the sizing task, produces small-caliber steel pipe to realize the bassoon material.Subtract, sizing mill is generally 3～24 frame dual roll type or three-roller types, subtract, the steel pipe sizes behind the sizing no longer changes.Present domestic advanced unit is three-roller type.
Weldless steel tube subtracts, sizing roll is subjected to tangential the stretching and the compound stress of radial compression, and bears the alternating thermal stress effect simultaneously under 800～980 ℃ high temperature and water coolant chilling action.Produce between roll working-surface and the steel pipe and roll and sliding friction, because of surface irregularity, easily steel bonding scratches steel tube surface through regular meeting, and influence of rolled goes out steel tube surface quality.Particularly the tension reducing roll wear is more serious, in case wearing and tearing surpass just require must Replacement and Repair to satisfy the needs of rolling with negative tolerance, make roll change during operation frequently, influence productivity.General 1-2 order of classes or grades at school just needs more transducer set roll, changes more frequent when rolling high grade of steel steel or thick walled steel tube.Through repeatedly repairing processing, generally need machine away 50% in the use.When changing, also need to prepare a large amount of fixed, tube reducing frame.And repeat a large amount of metallic substance of processing waste, the frequent replacing is multiplied production cost.Therefore, require that weldless steel tube subtracts, sizing roll has thicker working lining, especially have high strength, high tenacity and good wear resistance, cold-and-heat resistent fatigability, and in actual production the degree of wear of strict control roll.
At present, what application was maximum in the advanced weldless steel tube unit is the Langaloy spheroidal graphite roll, relies on high alloy content to improve its performance, and the nickel content range is commonly used in 3%-4% at 1%-5%.The Langaloy spheroidal graphite roll adopts normalizing heat treatment technique to improve its interior tissue after forming strand usually.But the performance after the normalizing thermal treatment is difficult to satisfy service requirements, and high alloy costs an arm and a leg, and makes production cost high.The three-roller type weldless steel tube is fixed, the last groove of tube reducing roll and use after reparation, all be installed on the frame and finish at three rolls, be subjected to the quantitative limitation of frame deposit, all need repair pass after each the use.Can reclaim remelting though scrap roll, scrap roll weight and generally lose 40-50%, really wear and tear seldom aborning, wherein the overwhelming majority all becomes scrap in reparation.Especially when the little steel pipe of rolling batch, only be normal about 20% work-ing life sometimes, with still repairing later.The reparation amount of this replacing specification is bigger, and general radial direction can machine away 3-10mm.
Above-mentioned use-pattern shows metallic substance, and especially the waste of noble metal nickel and the energy is very big.
Summary of the invention
The objective of the invention is in order to solve the problems referred to above that weldless steel tube stretch-reducing mill or used for sizing mill casting roll occur.At present in material design, should reduce alloy content as much as possible satisfying service condition, especially reduce the cardinal principle that noble metal content is the low-carbon (LC) requirement.The present invention adopts the alloy minimizing to be designed for the spheroidal graphite roll of hot rolled seamless steel tube stretch-reducing mill or sizing mill, a kind of no nickel low alloying composition design is provided, and the spheroidal graphite roll preparation method who adopts special thermal treatment, i.e. the preparation method of the spheroidal graphite roll of alloy minimizing design.Technical scheme of the present invention is as follows:
Tube reducing machine of the present invention or sizing mill spheroidal graphite roll component are by weight percentage: C:3.5-4.0%, Si:2.3-2.7%, Mn :≤0.35%, Cu:0.4-0.6%, Cr:0.1-0.5%, Mo:0.2-0.4%, Nb:0.05-0.15%, Ti:0.03-0.1%, Al:0.02-0.05%, Mg:0.04-0.06%, P≤0.06, S≤0.02, surplus is an iron.
Tube reducing machine of the present invention or sizing mill spheroidal graphite roll preparation method, its characteristics are to adopt and carry out isothermal quenching continuously respectively in two kinds of differing temps bath salts, may further comprise the steps:
The set of dispense ratio of selected spheroidal graphite roll carries out melting, adopts castmethod to add nodulizing agent and casts out required roll strand, and the breaker roll strand carries out roughing, and the roll after the processing is heated to 850-900 ℃, soaking time 1-4h; It is to carry out isothermal quenching, isothermal time 10-25min in 260 ± 10 ℃-290 ± 10 ℃ the bath salt that above-mentioned roll is entered temperature; Then roll is moved to rapidly in 330 ± 10 ℃ of-380 ± 10 ℃ of bath salts and continue isothermal quenching, isothermal time 50-70min takes out air cooling then, and breaker roll carries out precision work.Wherein, the preparation spheroidal graphite roll is preferably used the yttrium-base heavy rare earth nodulizing agent; Quenchant adopts 50%NaNO
3+ 50%KaNO
3Fused salt mixt; Adopt rotary casting or sand mold casting to cast out required roll strand.
The roll of the present invention's preparation reduces the nickelalloy component content, and adopts two-step approach isothermal quenching heat treating method, has obtained the spheroidal graphite roll of high strength and high tenacity, has guaranteed the normal operation of producing.Simultaneously, reduced using and consuming of noble metal, thereby reduced manufacturing cost and use cost to greatest extent.
Description of drawings
Fig. 1 is the graphite form metallographic structure figure in kind of roll of the present invention;
Fig. 2 is Langaloy spheroidal graphite roll graphite form metallographic structure in kind figure;
Fig. 3 is the matrix metallographic structure figure in kind of roll of the present invention;
Fig. 4 is Langaloy spheroidal graphite roll matrix metallographic structure in kind figure.
Embodiment
Following reference design philosophy of the present invention, exemplary embodiment is also done following detailed description to the present invention in conjunction with the accompanying drawings.
Spheroidal graphite roll of the present invention is applied on the sinking mill or sizing mill unit of weldless steel tube, according to the working condition of roll, requires it to have high strength, high tenacity, good wear resistance and cold-and-heat resistent fatigability.In order to save valuable alloy and manufacturing cost, this roll adopts alloy minimizing design, promptly under the condition that does not change the roll use properties, deduct the high nickelalloy composition of some cost or alternative with the low composition of cost, and by rational heat treatment technology, the use properties of spheroidal graphite roll is higher than or is not less than existing roll, to satisfy the service requirements of seamless steel tube reducing machine and sizing mill roll.Therefore, the present invention is through repeatedly experiment, select to adopt the roll component by weight percentage, C:3.5-4.0%, Si:2.3-2.7%, Mn :≤0.35%, Cu:0.4-0.6%, Cr:0.1-0.5%, Mo:0.2-0.4%, Nb:0.05-0.15%, Ti:0.03-0.1%, Al:0.02-0.05%, Mg:0.04-0.06%, P≤0.06, S≤0.02, surplus is an iron.
The selected above-mentioned spheroidal graphite roll set of dispense ratio of the present invention carries out melting, adopt rotary casting or routine casting method to cast out required roll strand, the breaker roll strand carries out roughing, roll after the roughing is heated to 850-900 ℃, preferred Heating temperature 880-900 ℃, behind the insulation 1-4h, it is that 260 ± 10 ℃-290 ± 10 ℃ bath salt carries out the 10-25min isothermal quenching that roll is put into temperature, 275 ± 10 ℃ of preferred austempering temperatures; Then the roll strand is moved to rapidly in 330 ± 10 ℃ of-380 ± 10 ℃ of bath salts and continue isothermal quenching, preferred 340 ± 10 ℃ of isothermal quenching, isothermal 50-70min takes out air cooling, and breaker roll carries out precision work then.Spheroidal graphite cast iron of the present invention is selected yttrium-base heavy rare earth nodulizing agent or other nodulizing agent for use, selects 50%NaNO for use
3+ 50%KaNO
3The fused salt mixt quenchant.
The also preferred one group of roll component of the present invention is by weight percentage: C:3.6-3.8%, Si:2.3-2.5%, Mn :≤0.35%, Cu:0.4-0.6%, Cr:0.3-0.4%, Mo:0.2-0.4%, Nb:0.08-0.12%, Ti:0.05-0.08%, Al:0.02-0.05%, Mg:0.04-0.06%, P≤0.06, S≤0.02, surplus is an iron.
In the component of roll of the present invention, C can promote greying, is the important factor that improves hardness and wear resistance.Preventing under the condition of graphite floatation, should improve C content as far as possible, therefore getting 3.5-4.0%; But Si refinement graphite pebbles and increase number of graphite ball, but can reduce impelling strength when 〉=3.4%, preferentially get 2.3-2.7% through testing; The Mn element hinders greying strongly, can produce macrosegregation when content is high, is therefore satisfying under the performance requriements, low as far as possible being advisable, therefore get≤0.35%; Low and the final set of P fusing point can become fragile matrix along crystal boundary precipitation of phosphorus eutectic, answers strict controlled contents, therefore get≤0.06%; And S is a tension-active element, and content Gao Shiyi produces low melting point Fe and is distributed on the crystal boundary, reduces intensity and toughness, answers strict controlled contents, therefore get≤0.02%; Selected Cu can improve hardening capacity, improves the homogeneity of casting section microstructure and property, but the too high crystal boundary that is easy to separates out, and reduces elongation, impelling strength and intensity, and reasonable content is got 0.4-0.6%; Cr can form stable Fe-Cr-C compound, improves wear resistance, intensity, oxidation-resistance and the hardening capacity of roll, but too highly will influence nodularization, reduction plasticity and toughness, and it is good getting 0.1-0.5% through experiment; A spot of Mo is dissolved in ferrite and cementite, can strengthen matrix, crystal grain thinning, uniform formation, raising hardening capacity, but the then easy segregation of molybdenum amount height reduces plasticity and toughness, therefore gets 0.2-0.4%; Nb is the strong carbide element, can generate rich niobium that the regular shape disperse distributes fine particle mutually with carbon, nitrogen, improves wear resistance, intensity and splitting resistance, therefore gets 0.05-0.15%; Ti energy thinning microstructure and carbide in the component improve wear resistance, intensity, get 0.03-0.10%, and choosing of Al is to strengthen graphite, and purify hot metal improves the nodularization performance, therefore, gets 0.02-0.05%.
The present invention adopts rational set of dispense ratio, in spheroidal graphite roll, do not add nickel, reduce other alloying constituent content, and employing two-step approach isothermal quenching heat treating method, obtained than containing nickelic composition and conventional thermal treatment is more tiny, Austria that is more evenly distributed-iron tissue, thereby toughness is significantly increased, over-all properties strengthens, hardness can reach 45-53HRC, its wear resisting property uses through laboratory experiment and installation, reach traditional nickelic sizing, the roll level of tube reducing alloy nodular cast iron makes the present invention reduce using and consuming of noble metal, thereby reduces manufacturing cost and use cost to greatest extent.
Embodiment 1
Embodiment 1 is for making Φ 250 seamless steel pipe rolling mill groups hot rolled seamless steel tube sizing mill spheroidal graphite roll, and roll compositions in weight percentage (%Wt) sees Table 1.
Table 1
| C | Si | Mn | Cu | Cr | Mo | Nb | Ti | Al | Mg | P | S |
| 3.6 | 2.3 | 0.2 | 0.4 | 0.3 | 0.2 | 0.08 | 0.05 | 0.02 | 0.04 | 0.03 | 0.02 |
All the other are Fe.
According to the selected proportioning raw materials of the listed component of table 1, carry out melting and obtain the molten steel of required composition, add the yttrium-base heavy rare earth nodulizing agent and carry out rotary casting, need to obtain the roll strand of specification, the breaker roll strand carries out roughing then, and roll is heated to 880 ℃ and be incubated 2 hours; The bath salt stove of then roll being put into temperature and be 275 ± 10 ℃ carries out the isothermal quenching of 15min, roll is moved to rapidly in 340 ± 10 ℃ of bath salts continue isothermal quenching then, and isothermal 55min takes out air cooling, and breaker roll carries out precision work at last.The present invention selects 50%NaNO for use
3+ 50%KaNO
3The mixing dissolved salt as quenchant.Through check, the working face hardness of roll can reach 45HRC, and wear resistance improves greatly, and shock resistance and toughness all increase.This roll is applied to the German three-roller type sizing mill finishing stand that produces of domestic introduction, rolling external diameter is a Φ 139.7mm petroleum casing pipe, reach the level of the alloy nodular cast iron roll of the homemade Ni3 of containing～4% work-ing life, through repeatedly repairing, its working face hardness still remains on 44HRC when scrapping, and has satisfied the production actual demand.
Embodiment 2
Embodiment 2 is for making Φ 508 weldless steel tubes week milling train group hot rolled seamless steel tube sizing mill spheroidal graphite roll, and roll compositions in weight percentage (%Wt) sees Table 2.
Table 2
| C | Si | Mn | Cu | Cr | Mo | Nb | Ti | Al | Mg | P | S |
| 3.8 | 2.5 | 0.3 | 0.6 | 0.4 | 0.4 | 0.12 | 0.08 | 0.05 | 0.06 | 0.04 | 0.015 |
All the other are Fe.
According to the selected proportioning raw materials of the listed component of table 2, carry out melting and obtain the molten steel of required composition, add the yttrium-base heavy rare earth nodulizing agent and carry out rotary casting, need to obtain the roll strand of specification, the breaker roll strand carries out roughing then, and roll is heated to 890 ℃ and be incubated 3 hours; The bath salt stove of then roll being put into temperature and be 285 ± 10 ℃ carries out the isothermal quenching of 20min, roll is moved to rapidly in 350 ± 10 ℃ of bath salts continue isothermal quenching then, isothermal 60min takes out air cooling, and breaker roll carries out precision work at last.The present invention selects 50%NaNO for use
3+ 50%KaNO
3The mixing dissolved salt as quenchant.Through check, the working face hardness of roll can reach 48HRC, and wear resisting property, shock resistance and toughness all increase.This roll is applied to all milling train groups of domestic Φ 508 weldless steel tubes, and rolling external diameter is that Φ 339.7mm, material are P110 and N80 steel pipe, reaches the level of the alloy nodular cast iron roll of the homemade Ni3 of containing～4% work-ing life.Its working face hardness still remains on 46HRC when scrapping.
Embodiment 3
Embodiment 3 is for making Φ 720 seamless steel pipe rolling mill groups hot rolled seamless steel tube sizing mill spheroidal graphite roll, and roll compositions in weight percentage (%Wt) sees Table 3.
Table 3
| C | Si | Mn | Cu | Cr | Mo | Nb | Ti | Al | Mg | P | S |
| 4.0 | 2.7 | 0.35 | 0.5 | 0.5 | 0.3 | 0.05 | 0.03 | 0.03 | 0.05 | 0.036 | 0.01 |
All the other are Fe.
According to the selected proportioning raw materials of the listed component of table 3, carry out melting and obtain the molten steel of required composition, add the yttrium-base heavy rare earth nodulizing agent and carry out rotary casting, need to obtain the roll strand of specification, the breaker roll strand carries out roughing then, and roll is heated to 860 ℃ and be incubated 1 hour; The bath salt stove of then roll being put into temperature and be 270 ± 10 ℃ carries out the isothermal quenching of 15min, roll is moved to rapidly in 370 ± 10 ℃ of bath salts continue isothermal quenching then, isothermal 70min takes out air cooling, and breaker roll carries out precision work at last.The present invention selects 50%NaNO for use
3+ 50%KaNO
3The mixing dissolved salt as quenchant.Through check, the working face hardness of roll can reach 50HRC, and wear resistance improves greatly, and shock resistance and toughness all increase.This roll is applied to the Φ 720 hot-expanding pipe units 4 roll-type sizing mills of domestic and international first maximum, also is maximum both at home and abroad weldless steel tube sizing mill roll, and roll maximum diameter φ 1177mm, single-piece weight reach 4207kg; Use the back wearing and tearing little and even, rolling back steel tube surface light no marking reaches design requirements.This roll is through repeatedly repairing, and working face hardness still can remain on 48HRC when scrapping.
Embodiment 4
Embodiment 4 is for making Φ 720 seamless steel pipe rolling mill groups hot rolled seamless steel tube stretch-reducing mill spheroidal graphite roll, and roll compositions in weight percentage (%Wt) sees Table 4.
Table 4
| C | Si | Mn | Cu | Cr | Mo | Nb | Ti | Al | Mg | P | S |
| 3.5 | 2.6 | 0.2 | 0.5 | 0.1 | 0.3 | 0.15 | 0.1 | 0.04 | 0.05 | 0.03 | 0.01 |
All the other are Fe.
According to the selected proportioning raw materials of the listed component of table 4, carry out melting and obtain the molten steel of required composition, add the yttrium-base heavy rare earth nodulizing agent and carry out rotary casting, need to obtain the roll strand of specification, the breaker roll strand carries out roughing then, and roll is heated to 900 ℃ and be incubated 4 hours; The bath salt stove of then roll being put into temperature and be 275 ± 10 ℃ carries out the isothermal quenching of 25min, roll is moved to rapidly in 340 ± 10 ℃ of bath salts continue isothermal quenching then, isothermal 55min takes out air cooling, and breaker roll carries out precision work at last.The present invention selects 50%NaNO for use
3+ 50%KaNO
3The mixing dissolved salt as quenchant.Through check, the working face hardness of roll can reach 53HRC, and wear resistance improves greatly, and shock resistance and toughness all increase.This roll is applied to the Φ 720 hot-expanding pipe units 4 roller type tension sinking mills of domestic and international first maximum, also is maximum both at home and abroad weldless steel tube roller tension reducing mill, and roll maximum diameter φ 1177mm, single-piece weight reach 4207kg; Use the back wearing and tearing little and even, rolling back steel tube surface light no marking reaches design requirements.This roll is through repeatedly repairing, and working face hardness still can remain on 50HRC when scrapping.
Embodiment 5
Embodiment 5 is for making Φ 250 seamless steel pipe rolling mill groups hot rolled seamless steel tube sinking mill spheroidal graphite roll, and roll compositions in weight percentage (%Wt) sees Table 5.
Table 5
| C | Si | Mn | Cu | Cr | Mo | Nb | Ti | Al | Mg | P | S |
| 3.7 | 2.4 | 0.15 | 0.45 | 0.2 | 0.2 | 0.10 | 0.06 | 0.03 | 0.04 | 0.02 | 0.01 |
All the other are Fe.
According to the selected proportioning raw materials of the listed component of table 5, carry out melting and obtain the molten steel of required composition, add the yttrium-base heavy rare earth nodulizing agent and carry out rotary casting, need to obtain the roll strand of specification, the breaker roll strand carries out roughing then, and roll is heated to 870 ℃ and be incubated 1.5 hours; The bath salt stove of then roll being put into temperature and be 280 ± 10 ℃ carries out the isothermal quenching of 23min, roll is moved to rapidly in 360 ± 10 ℃ of bath salts continue isothermal quenching then, isothermal 65min takes out air cooling, and breaker roll carries out precision work at last.The present invention selects 50%NaNO for use
3+ 50%KaNO
3The mixing dissolved salt as quenchant.Through check, the working face hardness of roll can reach 51HRC, and wear resistance improves greatly, and shock resistance and toughness all increase.This roll is applied on the German product of the domestic introduction three-roller type sinking mill, rolling external diameter is a Φ 139.7mm petroleum casing pipe, reach the level of the alloy nodular cast iron roll of the homemade Ni3 of containing～4% work-ing life, through repeatedly repairing, its working face hardness still remains on 49HRC when scrapping.
The present invention and existing roll effect comparison
The spheroidal graphite roll that preparation is finished carries out metallographic structure and service check, the result is referring to the graphite form metallographic structure figure in kind and the accompanying drawing 2 existing Langaloy spheroidal graphite rolls graphite form metallographic structure in kind figure of accompanying drawing 1 roll of the present invention, and the matrix metallographic structure figure in kind of accompanying drawing 3 rolls of the present invention and accompanying drawing 4 Langaloy spheroidal graphite rolls matrix metallographic structure in kind figure, two figure compare and can obviously find out, the spheroidization of graphite form of the metallographic structure of roll of the present invention under amplifying 100 times is tiny, distribution disperse and even, the matrix metallographic structure is even, grain refining, hardening capacity is good, obviously can improve the wear resistance of roll, over-all propertieies such as shock-resistance; And the irregular and skewness of spheroidization of graphite form of existing nickelic roll, matrix metallographic structure crystal grain is thick, and visible hardening capacity is bad, and the performance of breaker roll makes a big impact, and wear resistance and comprehensive strength thereof are reduced.
In kind and the existing Langaloy spheroidal graphite roll material object of roll of the present invention wear resisting property is to such as table 6.
Table 6
| Title material | Roll material object of the present invention | Langaloy spheroidal graphite roll material object |
| Abrasion loss mg | 17.2，18.1 | 17.3，17.9 |
In kind and the domestic Langaloy spheroidal graphite roll material object of roll of the present invention mechanical property is to such as table 7.
Table 7
Can find out that from the data of table 6 and table 7 the present invention does not add the spheroidal graphite cast iron of nickel and compares with existing Langaloy spheroidal graphite roll, both abrasion losies are basic identical, and wear resistance is in peer-level.But its tensile strength, impelling strength and roll hardness all are much higher than existing Langaloy spheroidal graphite roll.The present invention has saved noble metal, greatly reduces production cost, has significant technical progress effect, has embodied its creative place.
Because the high strength and the high tenacity of roll of the present invention, effectively avoided in use easily splitting, frangible phenomenon at size roll or tube reducing roller, what guaranteed to produce normally carries out.
The invention is not restricted to the foregoing description, in the scope that does not break away from design philosophy of the present invention, can carry out various changes and modifications, these variations all belong to protection scope of the present invention.
Claims (9)
1. tube reducing machine or sizing mill spheroidal graphite roll, it is characterized in that, the roll component is by weight percentage: C:3.5-4.0%, Si:2.3-2.7%, Mn :≤0.35%, Cu:0.4-0.6%, Cr:0.1-0.5%, Mo:0.2-0.4%, Nb:0.05-0.15%, Ti:0.03-0.1%, Al:0.02-0.05%, Mg:0.04-0.06%, P≤0.06, S≤0.02, surplus is an iron.
2. according to the described spheroidal graphite roll of claim 1, it is characterized in that, the roll component is by weight percentage: C:3.6-3.8%, Si:2.3-2.5%, Mn :≤0.35%, Cu:0.4-0.6%, Cr:0.3-0.4%, Mo:0.2-0.4%, Nb:0.08-0.12%, Ti:0.05-0.08%, Al:0.02-0.05%, Mg:0.04-0.06%, P≤0.06, S≤0.02, surplus is an iron.
3. tube reducing machine or sizing mill spheroidal graphite roll preparation method is characterized in that, adopt and carry out isothermal quenching respectively continuously in the bath salt of two kinds of differing tempss, may further comprise the steps:
The set of dispense ratio of selected spheroidal graphite roll carries out melting, adopts castmethod to add nodulizing agent and casts out required roll strand, and the breaker roll strand carries out roughing, and the roll after the processing is heated to 850-900 ℃, soaking time 1-4h;
It is to carry out isothermal quenching, isothermal time 10-25min in 260 ± 10 ℃-290 ± 10 ℃ the bath salt that above-mentioned roll is entered temperature; Then roll is moved to rapidly in 330 ± 10 ℃ of-380 ± 10 ℃ of bath salts and continue isothermal quenching, isothermal time 50-70min takes out air cooling then, and breaker roll carries out precision work.
4. according to the preparation method of the described spheroidal graphite roll of claim 3, it is characterized in that described nodulizing agent is selected the yttrium-base heavy rare earth nodulizing agent for use.
5. according to the preparation method of the described spheroidal graphite roll of claim 3, it is characterized in that quenchant adopts 50%NaNO
3+ 50%KaNO
3Fused salt mixt.
6. according to the preparation method of the described spheroidal graphite roll of claim 3, it is characterized in that, after the breaker roll strand carries out roughing, roll is heated to 880-900 ℃, soaking time 1-4h.
7. according to the preparation method of the described spheroidal graphite roll of claim 3, it is characterized in that it is to carry out isothermal quenching in 275 ± 10 ℃ of bath salts, isothermal time 10-25min that roll is entered temperature; Then roll is moved to rapidly in 340 ± 10 ℃ of bath salts and continue isothermal quenching, isothermal time 50-70min.
8. state the spheroidal graphite roll preparation method according to claim 1, it is characterized in that, described castmethod adopts rotary casting or sand mold casting to cast out required roll strand.
9. state the spheroidal graphite roll preparation method according to claim 1, it is characterized in that, roll hardness reaches 45-53HRC.
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| CN107354369A (en) * | 2017-06-20 | 2017-11-17 | 哈尔滨汽轮机厂有限责任公司 | A kind of spheroidal graphite cast-iron containing molybdenum used under 500 DEG C of high temperature and preparation method thereof |
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