CN102266929A - Method for compositely and centrifugally pouring high speed steel roll - Google Patents
Method for compositely and centrifugally pouring high speed steel roll Download PDFInfo
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Abstract
The invention relates to a method for compositely and centrifugally pouring high-chromium steel roll. The method is characterized in that: a semi-steel middle transitional layer is arranged between a high-chromium working layer and a spherical graphite cast iron part; the semi-steel middle transitional layer comprises the following chemical constitutions in percentage by weight: 1.0 to 2.4 percent of C, 0.4 to 1.5 percent of Si, 0.4 to 1.5 percent of Mn, 0 to 0.1 percent of P, 0 to 0.03 percent of S, 0 to 0.2 percent of Cr, 1.0 to 2.0 percent of Ni, 0 to 0.2 percent of Mo, and the balance of Fe. The method has the advantages that: the bonding strength of the high-chromium working layer and the spherical graphite cast iron part is improved, and accidents such as stripping of the bonding layer of the high-chromium composite cast steel roll and breakage of the roll can be avoided.
Description
Technical field
The present invention relates to compound cast steel roll technology field, particularly a kind of method of composite centrifugal casting high-speed steel roll.
Background technology
The ubiquitous problem of method of composite casting high-speed steel roll is at present, bond quality between outer high speed cast steel and the core spheroidal graphite cast-iron is difficult to guarantee, during composite casting, outer high-speed steel roll working lining contains a large amount of chromium, molybdenum, vanadium, carbide formers such as tungsten, and core is a spheroidal graphite cast-iron, the composition of these two kinds of materials differs greatly, the outer material that contains a large amount of carbide formers must form a large amount of carbide and be present in the binder course place with the carbon in the core spheroidal graphite cast-iron, 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 high-speed steel content is difficult to solve.During the composite casting high-speed steel roll, when skin solidifies back casting core molten ductile cast iron, the outer high speed cast steel refuse that the core molten ductile cast iron of being cast will make a part solidify, cause high speed content to spread to core, core speed 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 composite centrifugal casting high-speed steel roll, to increase the bond strength of high speed operation layer and spheroidal graphite cast-iron core, performance is safe and reliable.
The present invention realizes by the following technical solutions:
A kind of method of composite centrifugal casting high-speed steel roll, comprise that melting, cast, cooling are unpacked, heat treatment, it is characterized in that, between high speed operation layer of pouring into a mould and spheroidal graphite cast-iron core, the half steel intermediate layer is set, the chemical component weight percentage of described half steel intermediate layer is: C 1.0～2.4%, Si 0.4～1.5%, Mn 0.4～1.5%, P 0～0.1%, S 0～0.03%, and Cr 0～0.2%, and Ni 1.0～2.0%, Mo 0～0.2%, and all the other are Fe and unavoidable impurities.
Press 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-speed steel aqueous fusion, 1500～1600 ℃ of smelting temperatures, the melting of core spheroidal graphite cast-iron, 1450～1500 ℃ of smelting temperatures;
2) respectively to half steel intermediate layer molten steel, the processing of going bad of outer high speed cast steel molten steel, it is rare earth and silicon barium that half steel intermediate layer molten steel adds refining deterioration agent, addition is 0.2～0.6%, reaction temperature is 1500～1600 ℃, it is rare earth and silicon barium that working lining high speed cast steel molten steel adds refining deterioration agent, addition is 0.2～0.6%, reaction temperature is 1500～1600 ℃, the core molten ductile cast iron is carried out nodularization and inoculation, nodulizer is a yttrium-base heavy rare earth, and addition is 1.0～1.6%, and inovulant is 75 ferrosilicon, addition is 0.4～1.0%, 1450～1500 ℃ of reaction temperatures;
3) centrifugal casting, 1420～1480 ℃ of pouring temperatures, cast the high speed operation layer earlier, centrifugal gravity multiple 100～120G, cast thickness 90～110mm is when cast layer is cooled to 1225～1245 ℃, centrifugal casting half steel intermediate layer again, cast thickness 40～60mm, centrifugal gravity multiple 100～120G stops 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 inoculation, 1350～1430 ℃ of pouring temperatures;
5) normal temperature is cooled to 150～155 ℃ and unpacks, heat treatment, firing rate with 9～12 ℃/h is heated to 1000～1100 ℃, 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.
Compared with prior art, the invention has the beneficial effects as follows: the bond strength that has obviously improved high speed operation layer and core spheroidal graphite cast-iron, reduced the diffusion of speed in core spheroidal graphite cast-iron in the high speed operation layer effectively, prevented that effectively high speed compound cast steel roll binder course from peeling off the generation with roll breakage accident.
The specific embodiment
The present invention will be further described below in conjunction with embodiment.
A kind of method of composite centrifugal casting high-speed steel roll, comprise that melting, cast, cooling are unpacked, heat treatment, between high speed operation layer of pouring into a mould and spheroidal graphite cast-iron core the half steel intermediate layer is set, the chemical component weight percentage of described half steel intermediate layer is: C 1.0～2.4%, Si 0.4～1.5%, Mn 0.4～1.5%, and P 0～0.1%, and S 0～0.03%, Cr 0～0.2%, Ni 1.0～2.0%, and Mo 0～0.2%, and all the other are Fe and unavoidable impurities.Press following job step production:
1) intermediate frequency furnace melting, carry 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 1.0～2.4%, Si 0.4～1.5%, Mn 0.4～1.5%, and P 0～0.1%, S0～0.03%, Cr 0～0.2%, Ni 1.0～2.0%, and Mo 0～0.2%, and all the other are Fe and unavoidable impurities.
The outer molten steel melting of high-speed steel, 1500～1600 ℃ of smelting temperatures, chemical component weight percentage is: C 1.5～2.5%, Si 0.4～1.5%, Mn 0.4～1.5%, and P 0～0.03%, and S 0～0.03%, Cr 2～10%, Ni 1.0～2.0%, and Mo 2～10%, and V 2～10%, W 0～6%, 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: C 3.0～3.5%, and Si 2.0～3.0%, and Mn 0～0.5%, P 0～0.1%, S 0～0.03%, and Mg 0.03～0.06%, and Re 0.02～0.05%, Mo 0～0.2%, and all the other are Fe and unavoidable impurities.
2) respectively to half steel intermediate layer molten steel, the processing of going bad of outer high speed cast steel molten steel, it is rare earth and silicon barium that half steel intermediate layer molten steel adds refining deterioration agent, addition is 0.2～0.6%, reaction temperature is 1500～1600 ℃, it is rare earth and silicon barium that working lining high speed cast steel molten steel adds refining deterioration agent, addition is 0.2～0.6%, reaction temperature is 1500～1600 ℃, the core molten ductile cast iron is carried out nodularization and inoculation, nodulizer is a yttrium-base heavy rare earth, and addition is 1.1～1.7%, and inovulant is a silicon barium, addition is 0.4～1.0%, 1450～1500 ℃ of reaction temperatures;
3) centrifugal casting, 1420～1480 ℃ of pouring temperatures, cast the high speed operation layer earlier, centrifugal gravity multiple 120G, cast thickness 90～110mm is when cast layer is cooled to 1225～1245 ℃, centrifugal casting half steel intermediate layer again, cast thickness 40～60mm, centrifugal gravity multiple 120G stops 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 inoculation, 1350～1430 ℃ of pouring temperatures;
5) normal temperature is cooled to 150～155 ℃ and unpacks, heat treatment, firing rate with 9～12 ℃/h is heated to 1000～1100 ℃, 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 sees Table 1;
2. sample tensile mechanical properties assay sees 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 | 0.15 |
| 2 | 1.3 | 0.56 | 0.52 | 0.05 | 0.008 | 0.06 | 1.8 | 0.10 |
| 3 | 1.6 | 0.66 | 0.46 | 0.06 | 0.015 | 0.11 | 1.45 | 0.16 |
| 4 | 1.8 | 0.89 | 0.82 | 0.004 | 0.020 | 0.16 | 1.02 | 0.14 |
| 5 | 2.0 | 0.43 | 0.59 | 0.008 | 0.026 | 0.005 | 1.25 | 0.05 |
| 6 | 2.2 | 1.2 | 1.12 | 0.07 | 0.03 | 0.017 | 1.47 | 0.19 |
Table 2 sample tensile mechanical properties assay
| Numbering | Tensile strength (MPa) | The cracking point | Result of detection (GB/T1503-2008) |
| 1 | 400 | Transition zone and core junction | Qualified |
| 2 | 430 | Transition zone and core junction | Qualified |
| 3 | 410 | Transition zone and core junction | Qualified |
| 4 | 435 | Transition zone and core junction | Qualified |
| 5 | 420 | Transition zone and core junction | Qualified |
| 6 | 430 | Transition zone and core junction | Qualified |
Annotate: tensile strength is 5 sample means.
Claims (1)
1. the method for composite centrifugal casting high-speed steel roll, comprise that melting, cast, cooling are unpacked, heat treatment, it is characterized in that, between high speed operation layer of pouring into a mould and spheroidal graphite cast-iron core, the half steel intermediate layer is set, the chemical component weight percentage of described half steel intermediate layer is: C 1.0～2.4%, Si 0.4～1.5%, Mn 0.4～1.5%, P 0～0.1%, S0～0.03%, Cr 0～0.2%, and Ni 1.0～2.0%, Mo 0～0.2%, and all the other are Fe and unavoidable impurities;
Press 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-speed steel aqueous fusion, 1500～1600 ℃ of smelting temperatures, the melting of core spheroidal graphite cast-iron, 1450～1500 ℃ of smelting temperatures;
2) respectively to half steel intermediate layer molten steel, the processing of going bad of outer high speed cast steel molten steel, it is rare earth and silicon barium that half steel intermediate layer molten steel adds refining deterioration agent, addition is 0.2～0.6%, reaction temperature is 1500～1600 ℃, it is rare earth and silicon barium that working lining high speed cast steel molten steel adds refining deterioration agent, addition is 0.2～0.6%, reaction temperature is 1500～1600 ℃, the core molten ductile cast iron is carried out nodularization and inoculation, nodulizer is a yttrium-base heavy rare earth, and addition is 1.0～1.6%, and inovulant is 75 ferrosilicon, addition is 0.4～1.0%, 1450～1500 ℃ of reaction temperatures;
3) centrifugal casting, 1420～1480 ℃ of pouring temperatures, cast the high speed operation layer earlier, centrifugal gravity multiple 100～120G, cast thickness 90～110mm is when cast layer is cooled to 1225～1245 ℃, centrifugal casting half steel intermediate layer again, cast thickness 40～60mm, centrifugal gravity multiple 100～120G stops 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 inoculation, 1350～1430 ℃ of pouring temperatures;
5) normal temperature is cooled to 150～155 ℃ and unpacks, heat treatment, firing rate with 9～12 ℃/h is heated to 1000～1100 ℃, 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.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615106A (en) * | 2012-04-05 | 2012-08-01 | 常熟市轧辊厂限公司 | Boron-contained centrifugal composite high-speed steel roller and manufacturing method thereof |
| CN102628146A (en) * | 2012-04-05 | 2012-08-08 | 常熟市轧辊厂限公司 | High-nickel-chromium-alloy semi-steel roll and manufacturing method thereof |
| CN102717229A (en) * | 2011-12-26 | 2012-10-10 | 青岛正大铸造有限公司 | Production process for cylinder and doffer of centrifugal casting cotton combing machine |
| CN102828123A (en) * | 2012-08-03 | 2012-12-19 | 鞍钢重型机械有限责任公司 | Method for modifying centrifugal composite casting high-speed steel roll outer layer |
| CN103074539A (en) * | 2013-01-07 | 2013-05-01 | 鞍钢重型机械有限责任公司 | Centrifugal composite high-nickel-niobium wear-resisting cast iron roll and casting method thereof |
| CN104946965A (en) * | 2015-06-17 | 2015-09-30 | 铜陵市大成轧辊有限责任公司 | Spheroidal graphite cast steel roller and preparing method thereof |
| CN106825053A (en) * | 2016-12-29 | 2017-06-13 | 常州凯达重工科技有限公司 | A kind of high-speed steel shaped steel polishing roll and preparation method thereof |
| CN112808975A (en) * | 2020-12-29 | 2021-05-18 | 中钢集团邢台机械轧辊有限公司 | Two-layer composite high-speed steel roller and casting method thereof |
| CN113523242A (en) * | 2021-06-24 | 2021-10-22 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of high-boron high-speed steel centrifugal composite roller |
| CN114082922A (en) * | 2021-12-31 | 2022-02-25 | 甘肃酒钢集团西部重工股份有限公司 | Method for manufacturing high-speed steel roller |
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| CN1861827A (en) * | 2006-05-28 | 2006-11-15 | 江苏共昌轧辊有限公司 | Half high speed steel composite roller and preparation process thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717229A (en) * | 2011-12-26 | 2012-10-10 | 青岛正大铸造有限公司 | Production process for cylinder and doffer of centrifugal casting cotton combing machine |
| CN102615106A (en) * | 2012-04-05 | 2012-08-01 | 常熟市轧辊厂限公司 | Boron-contained centrifugal composite high-speed steel roller and manufacturing method thereof |
| CN102628146A (en) * | 2012-04-05 | 2012-08-08 | 常熟市轧辊厂限公司 | High-nickel-chromium-alloy semi-steel roll and manufacturing method thereof |
| CN102828123A (en) * | 2012-08-03 | 2012-12-19 | 鞍钢重型机械有限责任公司 | Method for modifying centrifugal composite casting high-speed steel roll outer layer |
| CN102828123B (en) * | 2012-08-03 | 2014-06-04 | 鞍钢重型机械有限责任公司 | Method for modifying centrifugal composite casting high-speed steel roll outer layer |
| CN103074539A (en) * | 2013-01-07 | 2013-05-01 | 鞍钢重型机械有限责任公司 | Centrifugal composite high-nickel-niobium wear-resisting cast iron roll and casting method thereof |
| CN104946965A (en) * | 2015-06-17 | 2015-09-30 | 铜陵市大成轧辊有限责任公司 | Spheroidal graphite cast steel roller and preparing method thereof |
| CN106825053A (en) * | 2016-12-29 | 2017-06-13 | 常州凯达重工科技有限公司 | A kind of high-speed steel shaped steel polishing roll and preparation method thereof |
| CN106825053B (en) * | 2016-12-29 | 2018-10-02 | 常州凯达重工科技有限公司 | A kind of high-speed steel shaped steel polishing roll and preparation method thereof |
| CN112808975A (en) * | 2020-12-29 | 2021-05-18 | 中钢集团邢台机械轧辊有限公司 | Two-layer composite high-speed steel roller and casting method thereof |
| CN113523242A (en) * | 2021-06-24 | 2021-10-22 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of high-boron high-speed steel centrifugal composite roller |
| CN114082922A (en) * | 2021-12-31 | 2022-02-25 | 甘肃酒钢集团西部重工股份有限公司 | Method for manufacturing high-speed steel roller |
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Application publication date: 20111207 |