CN102049485B - Method for composite centrifugal casting high-chromium steel roller - Google Patents
Method for composite centrifugal casting high-chromium steel roller Download PDFInfo
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Abstract
The invention relates to a method for a composite centrifugal casting high-chromium steel roller. The invention is characterized in that a semi-steel intermediate transition layer is arranged between a high-chromium working layer and a nodular-cast-iron core. The steel roller is produced through the following steps: smelting; modifying the semi-steel intermediate transition layer and the external high-chromium cast steel respectively, and nodulizing and inoculating melted iron used for preparing a nodular-cast-iron core; carrying out centrifugal casting; casting the nodular-cast-iron core; and cooling at room temperature and carrying out heat processing. The semi-steel intermediate transition layer comprises the following chemical components in percentage by weight: 1.0-2.2% of C, 0.4-1.5% of Si, 0.4-1.5% of Mn, 0-0.1% of P, 0-0.03% of S, 0-0.2% of Cr, 1.0-2.0% of Ni, 0.2-1.0% of Mo and the balance of Fe. The method provided by the invention has the beneficial effects that the bonding strength of the high-chromium working layer and the nodular-cast-iron core is enhanced, and occurrences of bonding-layer stripping and roller breakage accidents of the high-chromium composite cast steel roller are avoided.
Description
Technical field
The present invention relates to compound cast steel roll technology field, particularly a kind of method of centrifugal pouring high chromium centrifugal composite steel roll.
Background technology
The method of composite casting high chromium steel roller mainly comprises the rotten processing of molten iron at present, and the frock of roll neck mould is prepared, and cooling is unpacked; Heat treatment, operations such as inspection during manufacture, ubiquitous problem is; Bond quality between outer cast steel with high chromium and the core spheroidal graphite cast-iron is difficult to guarantee that outer floor height chromium compound cast steel roll working lining contains the chromium of 10-15%, and core is a spheroidal graphite cast-iron; The composition of these two kinds of materials differs greatly; Contain the high outer working lining of chromium and must form a large amount of carbide with the carbon in the core spheroidal graphite cast-iron and be present in the binder course place, make that the intensity of binder course is very low, be easy to take place the roll binder course during use and peel off accident; On the other hand, the problem that to the core diffusion roll neck intensity is reduced owing to outer floor height chromium content is difficult to solve.During the composite casting high chromium steel roller; When skin solidified back casting core molten ductile cast iron, the outer cast steel with high chromium refuse that the core molten ductile cast iron of being cast will make a part solidify caused high chromium content to spread to core; Core chromium content is increased; The chilling tendency of core increases, thereby will separate out more carbide and influence the bulk strength of roll, and roll breakage accident takes place when roll uses easily.
Summary of the invention
The object of the present invention is to provide a kind of method of centrifugal pouring high chromium centrifugal composite steel roll, to increase the bond strength of high chromium working lining and spheroidal graphite cast-iron core, performance is safe and reliable.
The present invention adopts following technical scheme to realize:
A kind of method of centrifugal pouring high chromium centrifugal composite steel roll is characterized in that, between high chromium working lining and spheroidal graphite cast-iron core, the half steel intermediate layer is set, and presses following job step production:
1) melting of half steel intermediate layer molten steel is carried out in intermediate frequency furnace melting respectively, 1500～1600 ℃ of smelting temperatures, the refining of working lining high chrome aqueous fusion, 1500～1600 ℃ of smelting temperatures, the melting of core spheroidal graphite cast-iron, 1450～1500 ℃ of smelting temperatures;
2) respectively to the processing of going bad of half steel intermediate layer molten steel, outer floor height chromium working lining cast steel molten steel; It is rare earth and two kinds of mixing or wherein a kind of of silicon barium that half steel intermediate layer molten steel adds refining deterioration agent; Addition is weight percentage 0.2～0.6%, and reaction temperature is 1500～1600 ℃; It is rare earth and silicon barium mixing or wherein a kind of that working lining cast steel with high chromium molten steel adds refining deterioration agent, and addition is 0.2～0.6%, and reaction temperature is 1500～1600 ℃; The core molten ductile cast iron is carried out nodularization and inoculated, and nodulizer is a yttrium-base heavy rare earth, and addition is 1.1～1.7%, and inovulant is a silicon barium, and addition is 0.4～1.0%, 1450～1500 ℃ of reaction temperatures;
3) high chromium working lining, 600～720 rev/mins of centrifugal speeds are cast in centrifugal casting earlier; Cast thickness 90～110mm; When cast layer is cooled to 1225～1245 ℃, centrifugal casting half steel intermediate layer again, cast thickness 40～60mm; 600～720 rev/mins of centrifugal speeds stop when cast layer is cooled to 1220～1240 ℃;
4) core spheroidal graphite cast-iron casting, with step 3 steel-casting and the mould assembling of roll neck mould, in the static casting step 2 through the core molten ductile cast iron of nodularization and inoculated, 1360～1400 ℃ of pouring temperatures;
5) normal temperature is cooled to 150～155 ℃ and unpacks, and heat treatment is heated to 1000～1100 ℃ with the firing rate of 9～12 ℃/h; Behind insulation 3～5h; Speed with 110～130 ℃/h is cooled to 420～460 ℃, and the speed with 10～20 ℃/h is cooled to room temperature again, and the firing rate with 9～13 ℃/h is heated to 450～550 ℃ again; Be incubated after 18～25 hours, be cooled to room temperature with the speed of 10～20 ℃/h.
The chemical component weight percentage of described half steel intermediate layer is: C 1.0～2.2%, and Si 0.4～1.5%, and Mn 0.4～1.5%; P 0～0.1%, and S 0～0.03%, and Cr 0～0.2%; Ni 1.0～2.0%, and Mo 0.2～1.0%, and all the other are Fe and unavoidable impurities.
Compared with prior art; The invention has the beneficial effects as follows: the bond strength that has obviously improved high chromium working lining and core spheroidal graphite cast-iron; Reduced the diffusion of chromium in core spheroidal graphite cast-iron in the high chromium working lining effectively, prevented that effectively high chromium compound cast steel roll binder course from peeling off the generation with roll breakage accident.
The specific embodiment
Below in conjunction with embodiment the present invention is further specified.
A kind of method of centrifugal pouring high chromium centrifugal composite steel roll is provided with the half steel intermediate layer between high chromium working lining and spheroidal graphite cast-iron core, and presses following job step production:
1) intermediate frequency furnace melting is carried out the melting of half steel intermediate layer molten steel, 1500～1600 ℃ of smelting temperatures; The chemical component weight percentage of half steel intermediate layer is: C 1.0～2.2%, and Si 0.4～1.5%, and Mn 0.4～1.5%; P 0～0.1%, S0～0.03%, and Cr 0～0.2%; Ni 1.0～2.0%, and Mo 0.2～1.0%, and all the other are Fe and unavoidable impurities.
The melting of high chromium working lining molten steel, 1500～1600 ℃ of smelting temperatures, the chemical component weight percentage of high chromium working lining steel is: C 1.0～1.6%; Si 0.3～0.8%, and Mn 0.4～1.0%, and P 0～0.1%; S 0～0.03%, and Cr 10～15%, and Ni 1.0～2.0%; Mo 1.0～2.0%, and all the other are Fe and unavoidable impurities.
The melting of core spheroidal graphite cast-iron, 1450～1500 ℃ of smelting temperatures, the chemical component weight percentage of core spheroidal graphite cast-iron is: C3.0～3.5%; Si 2.0～3.0%, and Mn 0.2～0.8%, and P 0～0.1%; S 0～0.03%, and Cr 0～0.5%, and Ni 0～0.5%; Mo 0～0.5%, Mg0.02～0.06%, Re0.01～0.03%.All the other are Fe and unavoidable impurities.
2) respectively to the processing of going bad of half steel intermediate layer molten steel, outer cast steel with high chromium molten steel; It is rare earth and two kinds of mixing or wherein a kind of of silicon barium that half steel intermediate layer molten steel adds refining deterioration agent; Addition is 0.2～0.6%, and reaction temperature is 1500～1600 ℃; It is rare earth and two kinds of mixing or wherein a kind of of silicon barium that high chromium working lining cast steel molten steel adds refining deterioration agent, and addition is 0.2～0.6%, and reaction temperature is 1500～1600 ℃; The core molten ductile cast iron is carried out nodularization and inoculated, and nodulizer is a yttrium-base heavy rare earth, and addition is 1.1～1.7%, and inovulant is a silicon barium, and addition is 0.4～1.0%, 1450～1500 ℃ of reaction temperatures;
3) high chromium working lining, 600～720 rev/mins of centrifugal speeds are cast in centrifugal casting earlier; Cast thickness 90～110mm; When cast layer is cooled to 1225～1245 ℃, centrifugal casting half steel intermediate layer again, cast thickness 40～60mm; 600～720 rev/mins of centrifugal speeds stop when cast layer is cooled to 1220～1240 ℃;
4) core spheroidal graphite cast-iron casting, with step 3 steel-casting and the mould assembling of roll neck mould, in the static casting step 2 through the core molten ductile cast iron of nodularization and inoculated, 1360～1400 ℃ of pouring temperatures;
5) normal temperature is cooled to 150～155 ℃ and unpacks, and heat treatment is heated to 1000～1100 ℃ with the firing rate of 9～12 ℃/h; Behind insulation 3～5h; Speed with 110～130 ℃/h is cooled to 420～460 ℃, and the speed with 10～20 ℃/h is cooled to room temperature again, and the firing rate with 9～13 ℃/h is heated to 450～550 ℃ again; Be incubated after 18～25 hours, be cooled to room temperature with the speed of 10～20 ℃/h.
6) ultrasonic examination, standard GB/T1503-2008.
7) quality test and analysis:
1. roll sample intermediate layer composition parameter is seen table 1;
2. sample tensile mechanical properties assay is seen table 2.
Table 1 roll sample intermediate layer composition parameter
| Numbering | C％ | Si％ | Mn％ | P％ | S％ | Cr％ | Ni％ | Mo％ |
| 1 | 1.0 | 0.5 | 0.42 | 0.001 | 0.002 | 0.15 | 1.4 | 0.45 |
| 2 | 1.3 | 0.56 | 0.52 | 0.05 | 0.008 | 0.06 | 1.5 | 0.25 |
| 3 | 1.6 | 0.66 | 0.46 | 0.06 | 0.015 | 0.11 | 1.45 | 0.36 |
| 4 | 1.8 | 0.89 | 0.82 | 0.004 | 0.020 | 0.16 | 1.02 | 0.74 |
| 5 | 2.0 | 0.43 | 0.59 | 0.008 | 0.026 | 0.005 | 1.25 | 0.65 |
| 6 | 2.2 | 1.2 | 1.12 | 0.07 | 0.03 | 0.017 | 1.47 | 0.69 |
Table 2 sample tensile mechanical properties assay
| Numbering | Tensile strength (MPa) | The cracking point | Result of detection (GB/T1503-2008) |
| 1 | 380 | Transition zone and core junction | Qualified |
| 2 | 390 | Transition zone and core junction | Qualified |
| 3 | 395 | Transition zone and core junction | Qualified |
| 4 | 410 | Transition zone and core junction | Qualified |
| 5 | 385 | Transition zone and core junction | Qualified |
| 6 | 405 | Transition zone and core junction | Qualified |
Annotate: tensile strength is 5 sample means.
Claims (1)
1. the method for a centrifugal pouring high chromium centrifugal composite steel roll is characterized in that, between floor height chromium working lining and the spheroidal graphite cast-iron core half steel intermediate layer is set outside, and presses following job step production:
1) melting of half steel intermediate layer molten steel, high chromium working lining molten steel melting and the melting of core spheroidal graphite cast-iron are carried out in intermediate frequency furnace melting respectively; 1500～1600 ℃ of half steel intermediate layer molten steel smelting temperatures, 1500～1600 ℃ of high chromium working lining molten steel smelting temperatures, 1450～1500 ℃ of core spheroidal graphite cast-iron smelting temperatures;
2) respectively to the processing of going bad of half steel intermediate layer molten steel, outer floor height chromium working lining cast steel molten steel; It is rare earth and two kinds of mixing or wherein a kind of of silicon barium that half steel intermediate layer molten steel adds refining deterioration agent; Addition is weight percentage 0.2～0.6%, and reaction temperature is 1500～1600 ℃; It is rare earth and silicon barium mixing or wherein a kind of that working lining cast steel with high chromium molten steel adds refining deterioration agent, and addition is 0.2～0.6%, and reaction temperature is 1500～1600 ℃; The core molten ductile cast iron is carried out nodularization and inoculated, and nodulizer is a yttrium-base heavy rare earth, and addition is 1.1～1.7%, and inovulant is a silicon barium, and addition is 0.4～1.0%, 1450～1500 ℃ of reaction temperatures;
3) high chromium working lining, 600～720 rev/mins of centrifugal speeds are cast in centrifugal casting earlier; Cast thickness 90～110mm; When cast layer is cooled to 1225～1245 ℃, centrifugal casting half steel intermediate layer again, cast thickness 40～60mm; 600～720 rev/mins of centrifugal speeds stop when cast layer is cooled to 1220～1240 ℃;
4) core spheroidal graphite cast-iron casting is with step 3) steel-casting and the mould assembling of roll neck mould, static casting step 2) in through the core molten ductile cast iron of nodularization and inoculated, 1360～1400 ℃ of pouring temperatures;
5) normal temperature is cooled to 150～155 ℃ and unpacks, and heat treatment is heated to 1000～1100 ℃ with the firing rate of 9～12 ℃/h; Behind insulation 3～5h; Speed with 110～130 ℃/h is cooled to 420～460 ℃, and the speed with 10～20 ℃/h is cooled to room temperature again, and the firing rate with 9～13 ℃/h is heated to 450～550 ℃ again; Be incubated after 18～25 hours, be cooled to room temperature with the speed of 10～20 ℃/h;
The chemical component weight percentage of described half steel intermediate layer is: C 1.0～2.2%, and Si 0.4～1.5%, and Mn 0.4～1.5%; P 0 ~ 0.1%, and S 0 ~ 0.03%, and Cr 0 ~ 0.2%; Ni 1.0～2.0%, and Mo 0.2～1.0%, and all the other are Fe and unavoidable impurities.
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Effective date of registration: 20171221 Address after: 114021 Tiexi District, Liaoning City, Anshan Iron and steel plant Patentee after: Anshan Iron Roll Co., Ltd. Address before: Anshan City, Liaoning province 114031 Lishan District Jianguo Road 40 A Patentee before: Angang Heavy Machinery Co., Ltd. |