CN1028545C - Roller made of infinitely chilled vanadium and titanium contained nodular cast iron and its casting process - Google Patents
Roller made of infinitely chilled vanadium and titanium contained nodular cast iron and its casting process Download PDFInfo
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- CN1028545C CN1028545C CN 91107234 CN91107234A CN1028545C CN 1028545 C CN1028545 C CN 1028545C CN 91107234 CN91107234 CN 91107234 CN 91107234 A CN91107234 A CN 91107234A CN 1028545 C CN1028545 C CN 1028545C
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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- Heat Treatment Of Sheet Steel (AREA)
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Abstract
The present invention relates to a roller made of infinitely chilled vanadium and titanium nodular cast iron and a casting process, which is characterized in that the roller does not contain precious alloy elements, such as Ni, Cr, Mo, Cu, etc., and mainly contains the nodular cast iron from the working layer of the roller body to the core; the roller is cast by using mixed nodulizer composed of nodulizer with rare earth magnesium and an iron-magnesium mechanism, and adopting a small-dose nucleating agent method and an annealing process in types. The roller produced by the present invention has the advantages of low cost, high hardness, good abrasive resistance and high intensity; when steel is rolled, roll breakage and chip off-falling of knurling edges are not easy to occur, when arranged on the first frame and the second frame of medium and small-sized rolling mills, the roller can replace a cast steel roller, and the service life of the roller is over 20% longer than that of the cast steel roller.
Description
The invention belongs to infinitely chilled ductile cast iron roll field, relate to a kind of indefinite chill spheroidal graphite roll and castmethod thereof.
Existing indefinite chill spheroidal graphite roll, all contain valuable alloying elements such as Ni, Cr, Mo, Cu in its Chemical Composition, even with the vanadium titanium iron be the ductile iron roll no exception (seeing " steel vanadium titanium " 1989 the 10th volumes the 3rd phase P43～48) of raw material production.In the castmethod of roll, spheroidizing generally uses pure magnesium or rare earth magnesium to make nodulizing agent, the general nucleating agent (0.4～1.0% Fe-Si75) of heavy dose that adds of inoculation, and low-temperature annealing is generally adopted in the elimination of internal stress.Therefore, not only cost is higher for existing unlimited chilled ductile iron roll, and nodularization rate instability, and intensity and hardness can not be taken into account simultaneously, have influenced work-ing life to some extent.
Number of patent application be CN86107631.1, name be called " centrifugal compound vanadium titanium cast iron roll and castmethod " though Chinese patent to provide a kind of be raw material with the vanadium titanium iron, the grain roll that does not contain valuable alloying elements such as Ni, Cr, Mo, Cu in the Chemical Composition, but because it adopts rotary casting, so the tissue of roll, technical process have very big difference.And because the required equipment costliness causes the cost of similar roll to be higher than the unlimited chilled ductile iron roll.
The objective of the invention is to overcome the deficiencies in the prior art, a kind of indefinite chill spheroidal graphite roll and castmethod thereof that does not contain elements such as Ni, Cr, Mo, Cu is provided, and this kind roll not only cost is low, and the nodularization rate is stable, use properties is good, and the life-span increases substantially.
The object of the present invention is achieved like this:
Aspect material, be raw material with the vanadium titanium iron, give full play to of the strengthening effect of V-Ti element to the cast iron matrix tissue.By reasonable batching, make the Chemical Composition of roll be: C3.2%～3.8%, Si1.50～1.95%, Mn0.4～1.0%, P0.05～0.20%, S0.008～0.030%, V0.20～0.45%, Ti0.058～0.200%, Mg0.025～0.080%, RE0.02～0.06%, all the other Fe.
In organizational aspects, make the body of roll be spheroidal graphite cast iron to heart portion by correct technical process from working lining, working lining be organized as perlite+globular graphite+ledeburite, heart portion is organized as perlite+ferrite+globular graphite, and the pearlitic lamella of matrix slowly increases to heart portion from working lining.This kind tissue has guaranteed the use properties of roll, and making its hardness also is slow decline from the surface to heart portion, and per 5 millimeters 1～3HS that descend had both satisfied the needs of working lining hardness, had satisfied the needs of center intensity again.
On castmethod, following three characteristics are arranged with respect to prior art:
1. the mixed nodulizer that rare earth magnesium and iron and magnesium nodulizing agent are formed is used in the molten iron spheroidizing in the melting technology step.
2. the molten steel preparation in the molten sweetening process step is handled the low dose of nucleating agent method that adopts, the maximum adding quantity of nucleating agent Fe-Si75 is 0.1%, and the add-on of nucleating agent reduces along with the increase of the desired hardness of body of roll working lining, when HS＞64, even can not add nucleating agent, the silicon amount of utilizing nodulizing agent to contain breeds.This inoculation method produces roll in crystallisation process tissue can be taken into account the hardness and the intensity of roll simultaneously, improves the use properties of roll.
3. after the cast, annealing process is eliminated internal stress in the employing type.This technology is to adopt the insulation measure to reduce speed of cooling in the process of cooling of roll, makes it by a kind of annealing process of needed speed refrigerative.It had both reduced the heating process of low temperature annealing process, had improved the performance of roll again.
Method provided by the present invention, its technical process comprise processing steps such as moulding, melting, cast, the annealing of elimination internal stress, the demoulding, (Fig. 1 is the process flow sheet of method provided by the present invention) as shown in Figure 1.
During moulding, roll neck adopts sand mold up and down, and the body of roll adopts metal mold.
The main technologic parameters of controlling in the technical process is as follows:
Come out of the stove 1400～1420 ℃ of molten iron temperatures of cupola furnace, 1260 °～1300 ℃ of teeming temperatures.
The prescription of mixed nodulizer is a rare earth magnesium 60～80%, iron and magnesium nodulizing agent 20～40%.The add-on of nodulizing agent also will be considered the actual S content in furnace charge composition and the coke except calculating according to the requirement of Chemical Composition, if S content has surpassed the amount of Chemical Composition defined, and the every increase by 0.01% of S, then nodulizing agent will correspondingly increase by 0.01～0.02%.
The add-on of nucleating agent requires decision according to the hardness of roller body working lining, and HS is 60～64, adds Fe-Si750.05-0.1%, and HS 〉=64 add Fe-Si750.03～0.05% or do not add.
During cast, the temperature of metal mold is 50 °～100 ℃.
The annealed starting temperature is 600 ℃ in the type, and speed of cooling is 10～30 ℃/hour.
The present invention has the following advantages:
1. owing to do not contain valuable alloying elements such as Ni, Cr, Mo, Cu in the Chemical Composition, therefore, one ton of roll of every production can be saved 6～10 kilograms of above-mentioned alloying elements, compares with low Ni, Cr, Mo, Cu chill roll, can reduce cost 10～20%;
2. do not need specific equipment when producing, compare, can reduce cost 30～40% with vanadium titanium centrifugal compound roll;
3. body of roll working lining hardness height, wear resistance are good, and for the cogging breast roller, surface hardness is greater than 60HS, and for the finished frame roll, surface hardness is greater than 64HS, and axially and radial difference of hardness≤5HS.
4. the intensity of body of roll heart portion is higher, for cogging breast roller, σ
b〉=450MPa is for finished frame roll, σ
b〉=360MPa.
5. body of roll working lining net thickness is 30～40 millimeters, and it is little to the centre hardness gradient from working lining, per 5 millimeters 1～3HS that descend, therefore the needs that are suitable for most shaped roll, be used in and replace cast steel roll and half chill low-alloy magnesium iron roll on first, second frame of middle-size and small-size rolling mill, and its life-span is longer than above-mentioned two kinds of rolls, whenever reprocesses pass one time, and the above-mentioned two kinds of rolls of the rate ratio of rolling stock improve more than 20%.
6. spheroidizing is safe and reliable, nodularization rate＞80%, product percent of pass＞90%.
7. annealing had both reduced operation in the employing type, can reduce cost again, improve performance, made roll be difficult for roll breakage when rolling stock, and the roller trough rim is difficult for falling piece.
Embodiment:
Dimension of roller: Φ 285 * 600
Vanadium titanium iron 60%, roll foundry returns 26.6%, steel scrap 13.4%, Mn650.6%, Si750.3%.
Spheroidizing: add 1.4% rare earth magnesium 8-10,0.6% iron and magnesium nodulizing agent 8-9.
Inoculation: add 0.1%Fe-Si75.
Chemical Composition:
Before nodularization, the inoculation, C3.50%, Si1.20%, Mn0.55%, P0.18%, S0.086%, V0.325%, Ti0.064%, all the other Fe.
After nodularization, the inoculation, C3.47%, Si1.95%, Mn0.53%, P0.17%, S0.016%, RE0.032%, Mg0.071%, V0.30%, Ti0.058%, all the other Fe.
Processing parameter:
70 ℃ of metal type cast temperature, coating are carbonaceous+refractory materials.
1410 ℃ of molten iron tapping temperatures, 1260 ℃ of teeming temperatures are handled 1300 kilograms of molten iron and are watered two rolls, 11 seconds durations of pouring.
The annealing starting temperature is 600 ℃ in the type, 20 ℃/hour of speed of cooling.
Roll quality:
Body surface hardness 65HS, roll neck hardness 40HS, body surface difference of hardness 4.3HS, saddle type sample tensile strength 545MPa.
Claims (2)
1, a kind of vanadium titanium unlimited chilled ductile iron roll, it is characterized in that Chemical Composition (by weight percentage) is: C3.2%～3.8%, Si1.50～1.95%, Mn0.4～1.0%, P0.05%～0.20%, S0.008～0.030%, V0.20～0.45%, Ti0.058～0.200%, Mg0.025～0.080%, RE0.02～0.06%, all the other Fe.
2, a kind of castmethod of vanadium titanium unlimited chilled ductile iron roll is characterized in that comprising processing steps such as moulding, melting, cast, the annealing of elimination internal stress, the demoulding,
1. the mixed nodulizer that rare earth magnesium and iron and magnesium nodulizing agent are formed is used in the molten iron spheroidizing in the melting technology step, and the prescription of this mixed nodulizer is rare earth magnesium 60～80%, iron and magnesium nodulizing agent 20～40%,
2. the inoculation in the molten sweetening process step adopts low dose to breed method, and the add-on of nucleating agent Fe-Si75 reduces along with the increase of the desired hardness of body of roll working lining, and maximum adding quantity is 0.1%,
3. eliminate annealing in the internal stress annealing employing type, starting temperature is 600 ℃, 10～30 ℃/hour of speed of cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91107234 CN1028545C (en) | 1991-06-28 | 1991-06-28 | Roller made of infinitely chilled vanadium and titanium contained nodular cast iron and its casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91107234 CN1028545C (en) | 1991-06-28 | 1991-06-28 | Roller made of infinitely chilled vanadium and titanium contained nodular cast iron and its casting process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1068149A CN1068149A (en) | 1993-01-20 |
| CN1028545C true CN1028545C (en) | 1995-05-24 |
Family
ID=4908589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91107234 Expired - Fee Related CN1028545C (en) | 1991-06-28 | 1991-06-28 | Roller made of infinitely chilled vanadium and titanium contained nodular cast iron and its casting process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1028545C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465318C (en) * | 2005-06-10 | 2009-03-04 | 上海上大热欣科技发展有限公司 | CrMoCu alloy cast iron continuous casting section bar and manufacturing method thereof |
| CN103469053A (en) * | 2013-08-28 | 2013-12-25 | 希姆莱斯（大连）科技有限公司 | Spheroidal graphite cast iron foundation pile pipe and preparation process thereof |
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| CN102234734B (en) * | 2010-04-23 | 2013-01-23 | 成都三强轧辊股份有限公司 | Production process of modified alloy ball iron roller |
| CN102489690A (en) * | 2011-12-16 | 2012-06-13 | 十堰市泰祥实业有限公司 | Method for as-cast non-alloying production for QT500-7 main bearing cap of gasoline engine |
| CN103952622B (en) * | 2014-05-26 | 2016-08-24 | 陈国� | A kind of vanadium titanium ferrite ductile cast iron automotive hub and production technology thereof |
| CN105821296B (en) * | 2016-05-26 | 2017-11-21 | 湖北金标通用轧辊有限公司 | A kind of high-chromium alloy cast-iron roll and preparation method thereof |
| CN106435126A (en) * | 2016-11-03 | 2017-02-22 | 广西大学 | Heat treatment method of vanadium-titanium wear-resistant cast iron |
| CN106676242A (en) * | 2016-12-16 | 2017-05-17 | 广西大学 | Heat treatment method of cast iron jig boring lathe body |
| CN109986040A (en) * | 2017-12-29 | 2019-07-09 | 沈阳铸造研究所有限公司 | A kind of process preventing large complicated titanium alloy casting deformation |
| CN111020362B (en) * | 2019-12-31 | 2021-07-30 | 湖北腾升科技股份有限公司 | Nodular cast iron edging roll suitable for universal mill and manufacturing method thereof |
| CN111069582B (en) * | 2020-01-06 | 2021-04-06 | 四川大学 | Preparation method of low-stress casting |
-
1991
- 1991-06-28 CN CN 91107234 patent/CN1028545C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465318C (en) * | 2005-06-10 | 2009-03-04 | 上海上大热欣科技发展有限公司 | CrMoCu alloy cast iron continuous casting section bar and manufacturing method thereof |
| CN103469053A (en) * | 2013-08-28 | 2013-12-25 | 希姆莱斯（大连）科技有限公司 | Spheroidal graphite cast iron foundation pile pipe and preparation process thereof |
| CN103469053B (en) * | 2013-08-28 | 2016-06-22 | 于佩 | A kind of Spheroidal graphite cast iron foundation pile pipe and preparation technology thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1068149A (en) | 1993-01-20 |
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