CN103614653A - Method for manufacturing mill roll - Google Patents
Method for manufacturing mill roll Download PDFInfo
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- CN103614653A CN103614653A CN201310624280.9A CN201310624280A CN103614653A CN 103614653 A CN103614653 A CN 103614653A CN 201310624280 A CN201310624280 A CN 201310624280A CN 103614653 A CN103614653 A CN 103614653A
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Abstract
The invention relates to a method for manufacturing a mill roll. The method comprises the following steps that firstly, a pouring tube is well arranged on the central part of a mill roll casting mould, the upper end of the pouring tube is directly connected with a pouring cup, the lower end of the pouring tube is directly connected with a bottom box of the mill roll casting mould, the upper end of the pouring tube is open, the lower end of the pouring tube is closed, and the lower end of a burning and casting tube is provided with 15-40 circular holes with the diameters of 6-20 mm; then, well smelted molten steel with components meeting requirements is poured into the mill roll casting mould, the molten steel enters the pouring tube through the pouring cup and then enters the lower end of a cavity of the mill roll casting mould through the circular holes formed in the lower end of the pouring tube, the molten steel is filled in the cavity from bottom to top till the mill roll casting mould is filled with the molten steel; finally, the pouring tube is also inlaid on the central part of the mill roll. Compared with a common pouring steel mill roll manufacturing process, the method disclosed by the invention has the advantages that the process output rate is increased by 8%-12% and the service life is prolonged by 12%-15%.
Description
Technical field
The present invention relates to a kind of roll preparation method.
Background technology
Cast steel is that roll can be divided into two classes: Steel Roll (carbon content 0.4-1.4%) and semisteel roll (carbon content 1.4-2. 4%).Steel Roll carbon content is low, therefore hardness is lower, it is organized generally and is comprised of ferrite and pearlite, and along with carbon content increases, ferrite content reduces, and either pearlite occurred increases.For improving hardness, can add the alloying elements such as Cr, Ni, Mo, or carry out special thermal treatment, because Steel Roll has high tensile strength and toughness, be applicable to rolling temperature is high, rolling load is large big mill or blooming mill, also can be used as supporting roll.As carry out special thermal treatment, and obtain high rigidity more than HS90, also can be used as cold roll.Semisteel roll carbon content is between hollow steel rolls and cast iron roll, and it is organized mainly and consists of perlite, and contains certain carbide, and therefore, its strength ratio cast steel roll is slightly high, lower than grain roll, and the general cast steel roll of its hardness ratio is high.The main feature of semisteel roll is that inner hardness landing is very little, therefore, is specially adapted to manufacture deep hole type and rolls rod, is widely used in shape mill roughing and finishing stand, hot strip mill roughing and finish rolling leading portion working roll simultaneously.If increase silicone content in semisteel roll material, pass through graphitization processing, there is high hot-cracking resistance and obdurability, as blooming mill pressure roll, Heavy Section Steel shaping roll, cogging continuous rolling mill roller and hot strip mill edger roll, can obtain good effect of rolling.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of roll preparation method's technical scheme.
Described a kind of roll preparation method, is characterized in that: each components based on weight percentage of this roll is: C:0.50-0.80%; Si:0.30-1.20%; Mn:0.20-1.00%; P≤0.025%; S≤0.020%; Cr:4.50-6.00%; Ni:0.20-0.80%; Mo:0.20-1.00%; V:0.10-0.50%; All the other are Fe and inevitable impurity; This roll preparation method is: first in the centre of roll casting mold, install cast tubes, the upper end of cast tubes is directly connected with sprue cup, the lower end of cast tubes is directly connected with casting mold under casing, the upper end open of cast tubes, lower end closed, and open 15-40 diameter 6mm-20mm circular hole in burning cast tube lower end; Then melted and the satisfactory molten steel of composition are poured into roll casting mold, in molten steel casting process, molten steel enters cast tubes through sprue cup, then through the circular hole of cast tubes lower end and enter roll casting mold die cavity lower end, molten steel fills type from the bottom up, until casting mold is full of molten steel, last cast tubes is also embedded in roll centre; It is soft steel weldless steel tube or the welded tube of 0.10 %-0.25% that cast tubes is selected carbon content massfraction; Burn cast tube wall thickness and be controlled at 6mm-15mm, burn cast tube internal diameter and be controlled at 120mm-300mm.
Described a kind of roll preparation method, while it is characterized in that described casting weight is less than the roll of 3 tons, cast tubes wall thickness is 6mm-8mm, the diameter of cast tubes internal diameter is 120mm-150mm.
Described a kind of roll preparation method, while it is characterized in that described casting weight is greater than the roll of 10 tons, cast tubes wall thickness is 12mm-15mm, the diameter of cast tubes internal diameter is 250mm-300mm.
Described a kind of roll preparation method, while it is characterized in that the roll of 10 tons of described casting weight 3-, cast tubes wall thickness is 8mm-12mm, the diameter of cast tubes internal diameter is 150mm-250mm.
The present invention compared with prior art has the following advantages:
1) in Steel Roll casting cycle of the present invention, molten steel does not wash away casting mold, and the coating of mo(U)ld face can not brought in molten steel, and in addition, molten steel is stable filling type from the bottom up, can guarantee that roll inside is without inclusion defect;
2) gas in roll casting mold of the present invention is easy to discharge, and there will not be gas hole defect in roll;
3) roll of the present invention, due to the chilling action of cast tubes, has been eliminated the open texture of roll heart portion, and cast tubes has the effect of strengthening roll;
4) product yield of roll molten steel of the present invention improves 8%-12% than the common cast steel roll that waters;
5) roll of the present invention is than extending 12%-15% common work-ing life of watering Casting Roller.
Embodiment
Roll preparation method of the present invention, each components based on weight percentage of roll is: C:0.50-0.80%; Si:0.30-1.20%; Mn:0.20-1.00%; P≤0.025%; S≤0.020%; Cr:4.50-6.00%; Ni:0.20-0.80%; Mo:0.20-1.00%; V:0.10-0.50%; All the other are Fe and inevitable impurity; This roll preparation method is: first in the centre of roll casting mold, install cast tubes, the upper end of cast tubes is directly connected with sprue cup, the lower end of cast tubes is directly connected with casting mold under casing, the upper end open of cast tubes, lower end closed, and open 15-40 diameter 6mm-20mm circular hole in burning cast tube lower end; Then melted and the satisfactory molten steel of composition are poured into roll casting mold, in molten steel casting process, molten steel enters cast tubes through sprue cup, then through the circular hole of cast tubes lower end and enter roll casting mold die cavity lower end, molten steel fills type from the bottom up, until casting mold is full of molten steel, last cast tubes is also embedded in roll centre; It is soft steel weldless steel tube or the welded tube of 0.10 %-0.25% that cast tubes is selected carbon content massfraction; Burn cast tube wall thickness and be controlled at 6mm-15mm, burn cast tube internal diameter and be controlled at 120mm-300mm.
As preferably, when casting weight is less than the roll of 3 tons, cast tubes wall thickness is 6mm-8mm, and the diameter of cast tubes internal diameter is 120mm-150mm; When casting weight is greater than the roll of 10 tons, cast tubes wall thickness is 12mm-15mm, and the diameter of cast tubes internal diameter is 250mm-300mm; During roll that casting weight 3-is 10 tons, cast tubes wall thickness is 8mm-12mm, and the diameter of cast tubes internal diameter is 150mm-250mm.
Adopt the present invention to water cast steel roll, molten steel can not wash away casting mold, and the coating of mo(U)ld face can not brought in molten steel, and in addition, molten steel is stable filling type from the bottom up, can guarantee that the inner nothing of roll is mingled with, gas hole defect.Roll of the present invention, due to the chilling action of cast tubes, has been eliminated the open texture of roll heart portion, and the cast tubes that is embedded in roll centre has the effect of strengthening roll.Use the present invention to water cast steel roll, molten steel product yield is high, than the common product yield that waters cast steel roll, improves 8%-12%, can improve roll production efficiency thus, reduces roll production energy consumption, saves roll production cost.Adopt the Steel Roll of the present invention's casting, be applied to, in actual steel rolling production, without roll breakage, metamorphism, occur, roll surface uniformity of hardness is good, without peeling phenomenon, occurs, roll of the present invention is than extending 12%-15% common work-ing life of watering cast steel roll.
Claims (4)
1. a roll preparation method, is characterized in that: each components based on weight percentage of this roll is: C:0.50-0.80%; Si:0.30-1.20%; Mn:0.20-1.00%; P≤0.025%; S≤0.020%; Cr:4.50-6.00%; Ni:0.20-0.80%; Mo:0.20-1.00%; V:0.10-0.50%; All the other are Fe and inevitable impurity; This roll preparation method is: first in the centre of roll casting mold, install cast tubes, the upper end of cast tubes is directly connected with sprue cup, the lower end of cast tubes is directly connected with casting mold under casing, the upper end open of cast tubes, lower end closed, and open 15-40 diameter 6mm-20mm circular hole in burning cast tube lower end; Then melted and the satisfactory molten steel of composition are poured into roll casting mold, in molten steel casting process, molten steel enters cast tubes through sprue cup, then through the circular hole of cast tubes lower end and enter roll casting mold die cavity lower end, molten steel fills type from the bottom up, until casting mold is full of molten steel, last cast tubes is also embedded in roll centre; It is soft steel weldless steel tube or the welded tube of 0.10 %-0.25% that cast tubes is selected carbon content massfraction; Burn cast tube wall thickness and be controlled at 6mm-15mm, burn cast tube internal diameter and be controlled at 120mm-300mm.
2. a kind of roll preparation method according to claim 1, while it is characterized in that described casting weight is less than the roll of 3 tons, cast tubes wall thickness is 6mm-8mm, the diameter of cast tubes internal diameter is 120mm-150mm.
3. a kind of roll preparation method according to claim 1, while it is characterized in that described casting weight is greater than the roll of 10 tons, cast tubes wall thickness is 12mm-15mm, the diameter of cast tubes internal diameter is 250mm-300mm.
4. a kind of roll preparation method according to claim 1, while it is characterized in that the roll of 10 tons of described casting weight 3-, cast tubes wall thickness is 8mm-12mm, the diameter of cast tubes internal diameter is 150mm-250mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310624280.9A CN103614653A (en) | 2013-12-02 | 2013-12-02 | Method for manufacturing mill roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310624280.9A CN103614653A (en) | 2013-12-02 | 2013-12-02 | Method for manufacturing mill roll |
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| Publication Number | Publication Date |
|---|---|
| CN103614653A true CN103614653A (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310624280.9A Pending CN103614653A (en) | 2013-12-02 | 2013-12-02 | Method for manufacturing mill roll |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104099528A (en) * | 2014-07-08 | 2014-10-15 | 宁波市鄞州文昌金属制品有限公司 | Special-shaped roller and preparation method thereof |
| CN107790498A (en) * | 2017-09-15 | 2018-03-13 | 宝钢轧辊科技有限责任公司 | Cold rolling high strength car sheet specialized high-speed steel combines roller and its manufacture method |
-
2013
- 2013-12-02 CN CN201310624280.9A patent/CN103614653A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104099528A (en) * | 2014-07-08 | 2014-10-15 | 宁波市鄞州文昌金属制品有限公司 | Special-shaped roller and preparation method thereof |
| CN107790498A (en) * | 2017-09-15 | 2018-03-13 | 宝钢轧辊科技有限责任公司 | Cold rolling high strength car sheet specialized high-speed steel combines roller and its manufacture method |
| CN107790498B (en) * | 2017-09-15 | 2020-06-16 | 宝钢轧辊科技有限责任公司 | Special high-speed steel combined roller for cold-rolled high-strength automobile plate and manufacturing method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140305 |