CN103014564B - Metal material used for preparing flow passage component of slurry pump and preparation method of metal material - Google Patents
Metal material used for preparing flow passage component of slurry pump and preparation method of metal material Download PDFInfo
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- CN103014564B CN103014564B CN201310004039.6A CN201310004039A CN103014564B CN 103014564 B CN103014564 B CN 103014564B CN 201310004039 A CN201310004039 A CN 201310004039A CN 103014564 B CN103014564 B CN 103014564B
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Abstract
The invention discloses a metal material used for preparing a flow passage component of a slurry pump, which comprises the following components in percentage by weight: 2.2-2.8% of C, 13-20% of Cr, 0.5-1.0% of Si, 1.0-1.5% of Mn, 0.3-0.8% of Mo, 0.1-0.4% of B, 0.2-0.5% of Ti, less than 0.1% of S, less than 0.1% of P, and the balance of iron. The invention also provides a method for preparing the flow passage component by using the materials. The method comprises the following steps of: melting pig iron, waste steel and the like in a furnace; after melting clearly, adding ferromolybdenum and the like; regulating the components and heating, adding ferrotitanium and ferroboron, discharging and casting; shaping and machining; performing thermal treatment to the cast, cooling in air, and tempering. The metal material contains a large amount of alloy elements, the base rigidity is improved, the carbide is protected against untimely breaking and stripping; and the ratio of the alloy-alloy carbide is enhanced, and the alloy carbide is high in rigidity, excellent in wearing resistance effect and low in cost.
Description
Technical field
The present invention relates to a kind of metallic substance of high-wearing feature, especially a kind of metallic substance for the manufacture of flow passage component of slurry pump.
Background technology
Pulp pump is widely used in the slurry of the industry conveyings such as electric power, metallurgy, coal, building materials containing solid particulate.As thermal power plant's hydraulic(-ash) sluicing, technics of metallurgy mineral dressing factory pulp conveying, coal washery coal slurry and dense medium conveying etc.The maximum slurry weight concentration Cw of permission conveying is: ash (slag) slurry and coal slurry 45%; Ore pulp and dense medium 60%.Therefore to the flow passage components of Pulp pump, the parts such as such as impeller, spiral case, backplate, it requires higher to material resistance to abrasion, domestic most use KmTBCr26(2 wear-resistant white cast).KmTBCr26 material abrasion resistance is excellent, but cost is high.Therefore in order to while guarantee abrasion resistance, the reduction production cost of trying one's best becomes urgent demand.
Summary of the invention
The technical problem to be solved in the present invention is to provide the good and Pulp pump manufactured materials that cost is low and preparation method thereof of a kind of abrasion resistance.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of metallic substance for the manufacture of flow passage component of slurry pump, and its gordian technique is: the component containing following weight percent: C:2.2-2.8%; Cr:13-20%; Si:0.5-1.0%; Mn:1.0-1.5%; Mo:0.3-0.8%; B:0.1-0.4%; Ti:0.2-0.5%, S<0.1%, P<0.1%, surplus is iron.
Preferably, the weight percentage of above-mentioned each component is: C:2.4-2.7%; Cr:14-17%; Si:0.5-1.0%; Mn:1.0-1.5%; Mo:0.4-0.7%; B:0.1-0.3%; Ti:0.2-0.4%, S<0.1%, P<0.1%, surplus is iron.
Preferred further, the weight percentage of above-mentioned each component is C:2.6%; Cr:16%; Si:0.6%; Mn:1.2%; Mo:0.5%; B:0.2%; Ti%:0.3, S<0.1%, P<0.1%, surplus is iron.
Adopt above-mentioned metallic substance to manufacture the method for flow passage components, it comprises the following steps:
the pig iron, steel scrap, ferrochrome are added heat fused in stove successively, molten clear after add molybdenum-iron, ferrosilicon, ferromanganese;
after within the scope of adjusting component to component requirements, temperature rises to 1520 DEG C ~ 1580 DEG C, adds ferrotianium, ferro-boron, cast of coming out of the stove;
phenolic sand molding, teeming temperature 1400 DEG C ~ 1450 DEG C;
after foundry goods cooling, remove rising head, overlap, fash etc.;
5. carry out machining after casting annealing process, annealing device adopts coal gas annealing furnace;
6. foundry goods is warmed up to 930-950 DEG C by certain speed in heat treatment furnace, is incubated air cooling of coming out of the stove after 4-7 hour, then wants timely 200-220 DEG C and carries out temper.Employing equipment is pallet car type high temperature resistance furnace.
The reason of low cost high Wear-resistant metal material of the present invention active chemical design considerations and restriction content range is as follows:
Carbon, chromium content determine the volume fraction of carbide in material.The volume fraction improving carbide contributes to the raising of fastness to wear, higher chromium content, ensures the chromium content of carbide and raising matrix.
Add a certain amount of Mo, hardening capacity increases, and the generation of MoC carbide, makes material have higher wear resistance, can obtain higher matrix hardness after thermal treatment.
Mn has no significant effect the quantity of chromium carbide in material, structure.In carbide after a small amount of manganese of solid solution, hardness has increased slightly.
Si and oxygen affinity are greater than chromium, manganese etc., can reduce the scaling loss of these alloying elements in melting, but silicon can make the brittle transition temperature of material improve, and especially massive casting, limit silicone content, in case rupture in running.
S, P belong to objectionable impurities in the material, more few better.But unavoidably bring in molten iron again in starting material, so from the viewpoint of the Performance and Cost Modeling of material, the content of restriction S, P.
The mass percentage controlling chemical composition can also improve the mechanical property of novel low-cost high Wear-resistant metal material.
The beneficial effect that produces of technique scheme is adopted to be: metallic substance of the present invention is due to containing a large amount of alloying element, alloying element part is solid-solution in matrix on the one hand, matrix hardness is promoted, can better play a supporting role to carbide, avoid too early the fractureing and peeling off of carbide, on the other hand Alloy carbide proportion is increased, alloy carbide hardness is high, and anti-wear effect is good; And relative to KmTBCr26 material, its alloy content is low, cost reduces, and has more the market competitiveness.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
By the chemical composition requirement of material of the present invention, formulate rational proportion scheme, see embodiment 1-6; Joined in intermediate frequency furnace successively by melting technology requirement by various throwing furnace charge and melt, cast of coming out of the stove when iron liquid reaches 1520 DEG C ~ 1580 DEG C, phenolic sand molding, teeming temperature is 1400 DEG C ~ 1450 DEG C.After foundry goods cooling, removing is watered, rising head.Foundry goods is warmed up to 930-950 DEG C by certain speed in heat treatment furnace, is incubated air cooling of coming out of the stove after 4-7 hour, then wants timely 200-220 DEG C and carries out temper.
Chemical composition the results are shown in Table 1.
The chemical composition of each embodiment of table 1, in table, content is weight percentage
Note: the surplus in table 1 in an embodiment component is Fe.
The metallographic structure of metallic substance of the present invention is M+ alloy carbide+residual A, and the durometer level of embodiment 1-6 is HRC57-63 as can be seen from Table 1, meets service requirements.
Erosive wear is tested: in the present invention and GB, common used material KmTBCr26 does slurry erosive wear and tests (40-70 order quartz sand+50% water that medium is mass percent 50%) on wear testing machine, and rotating speed is 1425r/min.Materials behavior is: air quenching+tempering state.Polishing machine compares in table 2:
The polishing machine contrast of each embodiment of table 2
| Material | Erosive wear |
| KmTBCr26 | 1 |
| Embodiment 1 | 0.95 |
| Embodiment 2 | 0.93 |
| Embodiment 3 | 0.92 |
| Embodiment 4 | 0.98 |
| Embodiment 5 | 0.98 |
| Embodiment 6 | 0.95 |
It is as shown in the table: the erosive wear of regulation KmTBCr26 is 1, and the erosive wear of the preferred component of material of the present invention is in a ratio of 0.98, and a little less than KmTBCr26, but casting cost reduces about 1200 yuan/ton, and cost performance is high, and economic benefit is obvious.
Claims (4)
1. for the manufacture of a metallic substance for flow passage component of slurry pump, it is characterized in that: the component containing following weight percent: C:2.2-2.8%; Cr:13-20%; Si:0.5-1.0%; Mn:1.0-1.5%; Mo:0.3-0.8%; B:0.1-0.4%; Ti:0.2-0.5%, S<0.1%, P<0.1%, surplus is iron.
2. the metallic substance for the manufacture of flow passage component of slurry pump according to claim 1, is characterized in that: the weight percentage of described each component is: C:2.4-2.7%; Cr:14-17%; Si:0.5-1.0%; Mn:1.0-1.5%; Mo:0.4-0.7%; B:0.1-0.3%; Ti:0.2-0.4%, S<0.1%, P<0.1%, surplus is iron.
3. the metallic substance for the manufacture of flow passage component of slurry pump according to claim 1, is characterized in that: the weight percentage of described each component is C:2.6%; Cr:16%; Si:0.6%; Mn:1.2%; Mo:0.5%; B:0.2%; Ti%:0.3, S<0.1%, P<0.1%, surplus is iron.
4. adopt metallic substance described in claim 1 to manufacture the method for flow passage components, it is characterized in that: comprise the following steps:
the pig iron, steel scrap, ferrochrome are added heat fused in stove successively, molten clear after add molybdenum-iron, ferrosilicon, ferromanganese;
after in adjusting component to claimed range, temperature rises to 1520 DEG C ~ 1580 DEG C, adds ferrotianium, ferro-boron, cast of coming out of the stove;
phenolic sand molding, teeming temperature 1400 DEG C ~ 1450 DEG C;
after foundry goods cooling, remove rising head, overlap, fash;
5. foundry goods carries out machining after the annealing process;
6. foundry goods is warmed up to 930-950 DEG C by certain speed in heat treatment furnace, is incubated air cooling of coming out of the stove after 4-7 hour, then wants timely 200-220 DEG C and carries out temper.
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| CN103014564B true CN103014564B (en) | 2015-06-17 |
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| CN104073672A (en) * | 2014-06-17 | 2014-10-01 | 张家港市橡燊达机械有限公司 | Method for manufacturing heat-resistant metal part |
| CN106319335A (en) * | 2015-06-19 | 2017-01-11 | 石家庄栾兴泵业有限公司 | Antifriction cast iron for manufacturing flow passage component of slurry pump and heat treatment process of antifriction cast iron |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260497A (en) * | 2008-04-25 | 2008-09-10 | 北京工业大学 | Boron-containing high-chromium abrasion-proof cast iron and preparation method thereof |
| CN101818311A (en) * | 2010-05-13 | 2010-09-01 | 石家庄工业泵厂有限公司 | High-tenacity and wear-resistance metal material |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260497A (en) * | 2008-04-25 | 2008-09-10 | 北京工业大学 | Boron-containing high-chromium abrasion-proof cast iron and preparation method thereof |
| CN101818311A (en) * | 2010-05-13 | 2010-09-01 | 石家庄工业泵厂有限公司 | High-tenacity and wear-resistance metal material |
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Address after: 050100 Hebei city of Shijiazhuang province Jingxing area middle latitude road Applicant after: Shijiazhuang Industrial Pump Factory Co., Ltd. Address before: 050100 Tangshan City Jingxing Hebei province Zhongwei Road area Applicant before: Shijiazhuang Industrial Pump Factory Co., Ltd. |
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