CN101294256B - High-wearing GKMCr20 cast iron composition for manufacturing roller sleeve and disk liner, thermal treatment method thereof - Google Patents
High-wearing GKMCr20 cast iron composition for manufacturing roller sleeve and disk liner, thermal treatment method thereof Download PDFInfo
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Abstract
The invention relates to a high anti-wear GKMCr20 cast iron combination for manufacturing a roll sleeve and a disc lining, and a heat treatment method thereof, and more specifically relates to high anti-wear GKMCr20 cast iron used on a vertical grinding roll sleeve and the disc lining which bear the plough wear accompanied with impact, and the heat treatment method thereof. The combination contains the components by weight percentage as follows: C is 2.4 to 3.2 percent, Si is 0.4 to 0.8 percent, Mn is 0.6 to 2.0 percent, Mo is 0.5 to 1.2 percent, Cr is 18.0 to 22.0 percent, W is 0.8 to 1.5 percent, Ni is 0.3 to 0.6 percent, Cu is 0.8 to 1.2 percent, Nb is 0.06 to 0.10 percent, V is 0.08 to 0.12 percent, Ti is 0.08 to 0.12 percent, RE is 0.025 to 0.050 percent, and the other weight percentage is composed of Fe. When in heat treatment, a double drawing temper method is adopted, so that the antiwear property and the toughness are increased, the service life of products is prolonged, and the cost is reduced.
Description
Technical field
The present invention relates to a kind of high wear-resistant GKMCr20 cast iron composition and heat treating method thereof that is used to produce roller shell and dish lining, more specifically, relate to a kind of bearing with the Vertical Mill roller shell of ballistic plow wearing and tearing and the high wear-resistant GKMCr20 cast iron and the heat treating method thereof of dish lining usefulness.
Background technology
In recent years, the cement of China, industries such as electric power, the large-scale highly effective energy-conserving vertical roller mill of increasingly extensive employing comminuting matter, roller shell and dish lining are the core components of this grinding machine, also are main consumable accessorys, are by cast form, make through thermal treatment and mechanical workout.Directly influence the performance of vertical grinder benefit their work-ing life.Roller shell and dish lining belong to thick and large section casting parts, especially roller shell, and wall thickness is in the scope of 150-300mm, weight is up to 4-9t, to resistance to abrasion, toughness and hardening capacity etc. all has very high technical requirements simultaneously, so have higher difficulty in production technique links such as casting, thermal treatment and machinings.
At present, hard (Ni-Hard4) cast iron of nickel commonly used abroad, domestic extensive employing KmTBCr20Mo cast iron is as the material of general vertical grinder roller shell and dish lining.Because the roller shell of large-scale vertical grinding machine and dish lining when rolling broken material, are subjected to more serious repeated multiple times plow wearing and tearing, bear huge periodic alternation stress and certain impact load; In service at the large-scale vertical grinding machine; often be mixed with iron block (as the tup and the residual body such as bucket tooth of fracture) and bulk hard ware material in the material; make grinding machine produce bigger vibration, so the service condition of large-scale vertical grinding machine is more abominable, the wearing and tearing of roller shell and dish lining are even more serious.For the large-scale vertical grinding machine, the roller shell of hard (Ni-Hard4) cast iron of nickel and KmTBCr20Mo Cast Iron Production and dish lining can not satisfy production run to its resistance to abrasion and flexible requirement.
Summary of the invention
The invention provides a kind of high-wearing feature and flexible GKMCr20 cast iron composition that is used to produce roller shell and dish lining, the heat treating method of this cast iron composition also is provided simultaneously.
The present invention is achieved through the following technical solutions:
A kind of high wear-resistant GKMCr20 cast iron composition that is used to produce roller shell and dish lining, in mass percent, contain C:2.4%-3.2%, Si:0.4%-0.8%, Mn:0.6%-2.0%, Cr:18.0%-22.0%, Mo:0.5%-1.2%, W:0.8%-1.5%, Ni:0.3%-0.6%, Cu:0.8%-1.2%, Nb:0.06%-0.10%, V:0.08%-0.12%, Ti:0.08%-0.12%, RE:0.025%-0.050%, surplus is made of Fe.
Described a kind of high wear-resistant GKMCr20 cast iron composition that is used to produce roller shell and dish lining, the Cr and the ratio Cr/C of the content of C are the scope of 6.5-7.5, the content of Mn and W long-pending be the scope of 1.0-2.5, the content of Cu and Ni be the scope of 1.10-1.60 (Cu+Ni).
A kind of heat treating method that is used to produce roller shell and coils the high wear-resistant GKMCr20 cast iron composition of lining: the first step: cast iron composition is put into resistance furnace, be heated to 980 ℃-1020 ℃, insulation 6-8h carries out dry quenching; In second step, carry out dual temper: be heated to 425-475 ℃ for the first time, behind the insulation 4-6h, carry out air cooling; For the second time be heated to 200-250 ℃, behind the insulation 4-6h, carry out air cooling again.
This cast iron composition has the following advantages:
(1) makes full use of Mo, Cu, Ni and Mo, this two combinations gold element of W, Mn to improving the interaction of GKMCr20 cast iron hardening capacity,, improve hardening capacity, reduce production costs by multi-element alloyed.
(2) in order to guarantee that GKMCr20 cast iron has resistance to abrasion and flexible good combination, control carbide volume fraction is about 30%, and selecting Cr and the content of C is the scope of 6.5-7.5 than Cr/C.
(3) in GKMCr20 cast iron, Nb, V, Ti are that refining eutectic is organized effectively alloying element, and the refinement of tissue can improve resistance to abrasion and toughness, and these three kinds of element combinations add better effects if.
(4) in GKMCr20 cast iron, the pattern of eutectic carbides and distribution are to influence resistance to abrasion and flexible important factor.The rotten processing of RE can make the fragmentation of strip eutectic carbides, shortens, and is evenly distributed, and improves resistance to abrasion and toughness.The RE content range is 0.025%-0.050%.
(5) in the microstructure of GKMCr20 cast iron, when remained austenite content greater than 20% the time, under serious stressed repeatedly and impact condition, roller shell can peel off afterwards earlier and rupture.After the dry quenching, carry out temper at 425-475 ℃, can make most of unsettled austenitic transformation is martensite, then, carries out low-temperaturetempering again one time at 200-250 ℃, and the martensite that residual austenite is changed also obtains tempering.Microstructure after the thermal treatment is: eutectic carbides M
7C
3+ proeutectoid carbide+martensite+retained austenite, the volume fraction of residual austenite is below 15%.Through dual temper, not only reduced remained austenite content, improve hardness, and eliminated residual stress, improved toughness.
Description of drawings
Above-mentioned aspect of the present invention and other features will be explained in the description below in conjunction with accompanying drawing; Wherein:
Fig. 1 is the Photomicrograph of the embodiment of the invention.
Fig. 2 is the Photomicrograph of the embodiment of the invention
Fig. 3 is the Photomicrograph of comparative example.
Fig. 4 is the Photomicrograph of comparative example.
Fig. 5 is the embodiment of the invention and comparative example wear test figure as a result.
Embodiment
Hereinafter, describe embodiments of the invention in detail with chart with reference to the accompanying drawings.
In general, therefore domestic extensive employing KmTBCr20Mo cast iron be KmTBCr20Mo cast iron comparative example as the material of general vertical grinder roller shell and dish lining.Chemical ingredients with German Ac/V type direct reading spectroscopic instrument analysed preparation.The chemical ingredients of KmTBCr20Mo cast iron sees Table 1, and the chemical ingredients of GKMCr20 cast iron of the present invention sees Table 2.
Table 1
| Comparative example | C | Si | Mn | P | S | Cr | Mo | Ni | Cu |
| 1 | 2.89 | 0.61 | 0.81 | 0.049 | 0.040 | 20.5 | 1.99 | 0.65 | 0.71 |
| 2 | 2.88 | 0.51 | 0.79 | 0.051 | 0.047 | 20.3 | 1.95 | 0.69 | 0.64 |
| 3 | 2.85 | 0.55 | 0.75 | 0.039 | 0.048 | 19.8 | 2.06 | 0.67 | 0.68 |
Table 2
| Embodiment | C | Si | Mn | P | S | Cr | Mo | W | Ni | Cu | Nb | V | Ti | RE |
| 1-1 | 2.86 | 0.57 | 1.50 | 0.047 | 0.021 | 20.1 | 0.75 | 1.05 | 0.41 | 1.05 | 0.081 | 0.090 | 0.081 | 0.031 |
| 1-2 | 2.88 | 0.62 | 1.54 | 0.049 | 0.025 | 19.8 | 0.78 | 1.04 | 0.44 | 1.02 | 0.078 | 0.085 | 0.084 | 0.035 |
| 1-3 | 2.85 | 0.51 | 1.51 | 0.046 | 0.020 | 19.5 | 0.74 | 1.02 | 0.43 | 1.04 | 0.075 | 0.087 | 0.090 | 0.033 |
Resistance to abrasion is compared with KmTBCr20Mo cast iron with toughness, though GKMCr20 cast iron has increased alloying elements such as W, Nb, V, Ti, RE, but subtracted the add-on of expensive Mo element, market value with the metal current furnace charge is calculated, and the production cost of GKMCr20 cast iron roller shell and dish lining is than about 1000 yuan of KmTBCr20 cast iron reductions per ton.
Nb, V, Ti are that refining eutectic is organized effectively alloying element, and the refinement of tissue can improve, and the rotten processing of RE can make the fragmentation of strip eutectic carbides, shortens, and is evenly distributed, and improves resistance to abrasion and toughness.
Embodiment 2-1, the heat treating method of GKMCr20 cast iron chemical composition content such as embodiment 1-1: the first step: cast iron composition is put into resistance furnace, be heated to 980 ℃, insulation 8h carries out dry quenching.In second step, carry out dual temper: be heated to 450 ℃ for the first time, behind the insulation 5h, carry out air cooling; For the second time be heated to 200 ℃, behind the insulation 6h, carry out air cooling again.
Embodiment 2-2, the heat treating method of GKMCr20 cast iron chemical composition content such as embodiment 1-1: the first step: cast iron composition is put into resistance furnace, be heated to 1000 ℃, insulation 7h carries out dry quenching.In second step, carry out dual temper: be heated to 425 ℃ for the first time, behind the insulation 5h, carry out air cooling; For the second time be heated to 225 ℃, behind the insulation 5h, carry out air cooling again.
Embodiment 2-3, the heat treating method of GKMCr20 cast iron chemical composition content such as embodiment 1-1: the first step: cast iron composition is put into resistance furnace, be heated to 1020 ℃, insulation 6h carries out dry quenching.In second step, carry out dual temper: be heated to 475 ℃ for the first time, behind the insulation 4h, carry out air cooling; For the second time be heated to 200 ℃, behind the insulation 4h, carry out air cooling again.
Physicals according to the GKMCr20 cast iron of embodiment 2-1 gained is as follows:
In Fig. 1, Fig. 2, Fig. 3, Fig. 4, be with XJP-3C type binocular metallography microscope sem observation and analysis fibrous tissue.KmTBCr20Mo cast iron and microstructure of the present invention are: eutectic carbides M
7C
3+ proeutectoid carbide+martensite+residual austenite.But in the KmTBCr20Mo cast iron, the dentrite of pro-eutectic austenite is thicker, and the eutectic carbides major part is strip and discontinuous netted, skewness.And in GKMCr20 cast iron, since Nb, V, Ti microalloying and RE metamorphism, the remarkable refinement of the dentrite of pro-eutectic austenite, and the fragmentation of strip eutectic carbides shortens, and is tending towards forming isolated bulk, and is evenly distributed.
Table 3 is the test samples hardness HRC experimental result contrast table on HR-150A type Rockwell hardometer of KmTBCr20Mo cast iron and GKMCr20 cast iron, and the hardness that can draw GKMCr20 cast iron from table is higher than KmTBCr20Mo cast iron.
Table 3
| Specimen coding | 1 | 2 | 3 | 4 | 5 | Mean value |
| KmTBCr20Mo | 58.2 | 58.5 | 59.1 | 59.5 | 58.1 | 58.7 |
| GKMCr20 | 61.2 | 60.8 | 62.1 | 61.7 | 62.5 | 61.7 |
At the impact toughness of JB-300 type shock test aircraft measurements KmTBCr20Mo cast iron and GKMCr20 cast iron, test block is of a size of the 150X150X20mm non-notch, and its experimental result contrast sees Table 4, and the impact toughness of GKMCr20 cast iron is than the height of KmTBCr20Mo cast iron.
Table 4
| Specimen coding | 1 | 2 | 3 | 4 | 5 | Mean value |
| KmTBCr20Mo | 5.12 | 5.94 | 5.25 | 5.51 | 5.89 | 5.54 |
| GKMCr20 | 9.06 | 9.11 | 8.79 | 8.86 | 9.22 | 9.00 |
With reference to Fig. 5, endurance check carries out on MLD-10 type dynamic load abrasive test machine, and last specimen size is 10X10X30mm, following sample material is 35CrMnMo, and HRC58-60, abrasive material are 40-70 order quartz sand, flow 12kg/h impacts number of times 50 times/minute, ballistic work 1.5J.The sample running-in is 5 minutes before the test, moves and measures weightless value after 2 hours, and wear data is got the mean value of three samples.Draw the height of the resistance to abrasion of GKMCr20 cast iron than KmTBCr20Mo cast iron.
KmTBCr20Mo cast iron and GKMCr20 cast iron roller shell product with producing have carried out on-the-spot installation production test on the large-scale vertical grinding machine in cement mill, increased by 656 hour than KmTBCr20Mo cast iron the mean life of GKMCr20 cast iron roller shell.Satisfied the large-scale vertical grinding machine fully, roller shell has been reached requirement more than 8000 hours work-ing life.Its experiment the results are shown in Table 5.
Table 5
Annotate: the comprehensive moisture 5%-6% of grinding raw material, index TM easy to wear
F＞0.9
Claims (3)
1. one kind is used to produce roller shell and coils the high wear-resistant GKMCr20 cast iron composition that serves as a contrast, it is characterized in that: in mass percent, contain C:2.4%-3.2%, Si:0.4%-0.8%, Mn:0.6%-2.0%, Cr:18.0%-22.0%, Mo:0.5%-1.2%, W:0.8%-1.5%, Ni:0.3%-0.6%, Cu:0.8%-1.2%, Nb:0.06%-0.10%, V:0.08%-0.12%, Ti:0.08%-0.12%, RE:0.025%-0.050%, surplus is made of Fe, and the Cr and the ratio Cr/C of the content of C are the scope of 6.5-7.5.
2. a kind of high wear-resistant GKMCr20 cast iron composition that is used to produce roller shell and dish lining according to claim 1 is characterized in that: the content of Mn and W long-pending is the scope of 1.0-2.5, the content of Cu and Ni be the scope of 1.10-1.60 (Cu+Ni).
3. heat treating method that is used to produce the high wear-resistant GKMCr20 cast iron composition of roller shell and dish lining as claimed in claim 1, it is characterized in that: the first step: cast iron composition is put into resistance furnace, be heated to 980 ℃-1020 ℃, insulation 6-8h carries out dry quenching; In second step, carry out dual temper: be heated to 425-475 ℃ for the first time, behind the insulation 4-6h, carry out air cooling; For the second time be heated to 200-250 ℃, behind the insulation 4-6h, carry out air cooling again.
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| CN104928594B (en) * | 2015-05-29 | 2017-09-29 | 中钢集团邢台机械轧辊有限公司 | The manufacture method of aluminium Casting Roller set with thermal fatigue resistance |
| CN106119678B (en) * | 2016-07-27 | 2019-08-30 | 徐州鑫华耐磨材料有限公司 | A kind of formula and its preparation process of energy conservation steel ball |
| CN109735762B (en) * | 2019-01-25 | 2021-04-30 | 承德燕北冶金材料有限公司 | Alloy hammer head and preparation method thereof |
| CN111893373A (en) * | 2020-07-15 | 2020-11-06 | 中国兵器科学研究院宁波分院 | High-hardness wear-resistant cast iron and preparation method thereof |
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| 鲁幼勤.水泥工业用耐磨材料的选择与应用.2007年水泥技术交流大会暨第九届全国水泥技术交流大会论文集.2007,(2007),202-216. * |
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