CN1028545C - Vanadium-titanium infinite chilled ductile iron roller and casting method - Google Patents
Vanadium-titanium infinite chilled ductile iron roller and casting method Download PDFInfo
- Publication number
- 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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- Prior art keywords
- roll
- iron
- roller
- magnesium
- annealing
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 11
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 title claims description 6
- 238000005266 casting Methods 0.000 title abstract description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 13
- 239000011777 magnesium Substances 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 7
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000002667 nucleating agent Substances 0.000 claims description 7
- 238000011081 inoculation Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 6
- 229910052802 copper Inorganic materials 0.000 abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 6
- 229910052759 nickel Inorganic materials 0.000 abstract description 6
- 238000005096 rolling process Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 abstract description 2
- 241001391944 Commicarpus scandens Species 0.000 abstract 1
- 239000002054 inoculum Substances 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- MRHSJWPXCLEHNI-UHFFFAOYSA-N [Ti].[V].[Fe] Chemical compound [Ti].[V].[Fe] MRHSJWPXCLEHNI-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 210000000481 breast Anatomy 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 241000446313 Lamella Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001349 ledeburite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a V-Ti infinitely chilled nodular iron roll and its casting method, and is characterized by that its chemical composition contains no noble alloy elements of Ni, Cr, Mo and Cu, etc., and from working layer to core portion of roll body the nodular cast iron is used. During casting, a mixed nodulizer consisting of a rare earth magnesium and iron magnesium mechanical nodulizer is used, and a small-dose inoculant method and an in-mold annealing process are adopted. The roller produced by the invention has low cost, high hardness, good wear resistance and high strength, is not easy to break the roller and the edge of the roller groove is not easy to fall off when rolling steel, can replace the cast steel roller when being used on the first and second frames of a small and medium-sized rolling mill, and has the service life longer than that of the cast steel roller by more than 20 percent.
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 | Vanadium-titanium infinite chilled ductile iron roller and casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91107234 CN1028545C (en) | 1991-06-28 | 1991-06-28 | Vanadium-titanium infinite chilled ductile iron roller and casting method |
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 | Vanadium-titanium infinite chilled ductile iron roller and casting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1028545C (en) |
Cited By (2)
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|---|---|---|---|---|
| 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 profile 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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| CN106435126A (en) * | 2016-11-03 | 2017-02-22 | 广西大学 | Heat treatment method of vanadium-titanium wear-resistant cast iron |
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| CN111020362B (en) * | 2019-12-31 | 2021-07-30 | 湖北腾升科技股份有限公司 | A ductile iron edge roll suitable for universal rolling mill and its manufacturing method |
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-
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 profile 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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