CN102899590B - Long-service-life impeller of hydrapulper and production method thereof - Google Patents
Long-service-life impeller of hydrapulper and production method thereof Download PDFInfo
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- CN102899590B CN102899590B CN201210388003.8A CN201210388003A CN102899590B CN 102899590 B CN102899590 B CN 102899590B CN 201210388003 A CN201210388003 A CN 201210388003A CN 102899590 B CN102899590 B CN 102899590B
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Abstract
The invention provides a long-service-life impeller of a hydrapulper, produced by martensitic stainless steel, which is characterized in that the chemical components of the martensitic stainless steel by weight are as follows: 0.005% to 0.15% of carbon, 0% to 1.0 of silicon, 0.5% to 2.0% of magnesium, 0% to 0.030% of phosphorus, 0% to 0.010% of sulphur, 12.5% to 15.0% of chromium, 1.0% to 4.0% of nickel, 0.4% to 1.0% of molybdenum, 0.005% to 0.10% of nitrogen, 0.05% to 0.50% of niobium, and 0.5% to 1.2% of vanadium and the balance of iron and unavoidable impurities. A preparation method of the long-service-life impeller of the hydrapulper comprises the following steps of: 1) smelting the raw materials of component elements, casting and forming; 2) annealing; 3) machining; and 4) finish heat treatment. The preparation method is characterized in that: the annealing technology is as follows: furnace cooling to 600 DEG C after heating to 680 to 710 DEG C and maintaining for 1 to 6h, discharging and air cooling; the quenching process in the treatment process is as follows: heating up to 880 to 1,050 DEG C and preserving for 30 to 120min, and then oil cooling or air cooling; and the tempering process is as follows: heating up to 550 to 700 DEG C and maintaining for 30 to 120min, and then oil cooling or air cooling. The long-service-life impeller of the hydrapulper is long in service life and excellent in working property.
Description
Technical field
The present invention relates to a kind of long lifetime hydrapulpter impeller and manufacture method thereof, belong to papermaking equipment manufacturing technology field.
Background technology
Hydrapulpter is one of major equipment of Waste Paper Handling, deinking.Its principle of work is: utilize the phase mutual friction between mechanical rotation and produced simultaneously high speed waterpower Circulation and slurry, the water suction swollen of paper stock, makes to reduce in conjunction with fibrous binding force under slurry and hygrometric state, reaches the object of pulping.The key part of hydrapulpter is rotor wheel.Hydrapulpter impeller, size is large, has not only required quality light, wear-resisting but also require shock-resistant and corrosion-resistant.At present, hydrapulpter impeller is selected Martensite Stainless Steel manufacture conventionally.The typical trade mark of Martensite Stainless Steel has 12Cr13,20Cr13, and 30Cr13,40Cr13 etc. are used under Q-tempering treated state.With the raising of carbon content, the intensity of Martensite Stainless Steel, hardness improve, but toughness and solidity to corrosion reduce.Reduce carbon content, although toughness and solidity to corrosion can improve, due to lower hardness, wear resistance is not enough again.Therefore, the hydrapulpter impeller of manufacturing is at present short work-ing life, generally only has 60-90 days, need frequently change, and not only reduces productivity, but also makes the Efficiency Decreasing of pulping, increases energy consumption.
Summary of the invention
The object of this invention is to provide a kind of long lifetime hydrapulpter impeller and manufacture method thereof that can overcome above-mentioned defect, excellent working performance, its technical scheme is:
A hydrapulpter impeller, adopts Martensite Stainless Steel manufacture, it is characterized in that the chemical composition of Martensite Stainless Steel is by mass percentage: carbon 0.005 ~ 0.15, silicon 0 ~ 1.0, manganese 0.5 ~ 2.0, phosphorus 0 ~ 0.030, sulphur 0 ~ 0.010, chromium 12.5 ~ 15.0, nickel 1.0-4.0, molybdenum 0.4 ~ 1.0, nitrogen 0.005 ~ 0.10, niobium 0.05 ~ 0.50, vanadium 0.5-1.2, surplus is iron and inevitable impurity.
The preparation method of described long lifetime hydrapulpter impeller, comprises the following steps: 1) by the feedstock composition of Constitution Elements direct casting after melting; 2) annealing; 3) mechanical workout; 4) final thermal treatment, is characterized in that: step 2) annealing process be chilled to 600 ℃, the air cooling of coming out of the stove for stove after being heated to 680-710 ℃ of maintenance 1-6h; Step 4) treatment process comprises quench treatment and temper successively, and wherein quench treatment keeps 30-120min, then oil cooling or air cooling for being heated to 880-1050 ℃; Temper keeps 30-120min, then oil cooling or air cooling for being heated to 550 ℃-700 ℃.
The principle of foregoing invention technical scheme is: adopt a kind of high tenacity, wear-resisting, anti-corrosion Martensite Stainless Steel to manufacture hydrapulpter impeller, this Martensite Stainless Steel is to guarantee high tenacity and solidity to corrosion by reducing carbon content, add nitrogen element and vanadium, niobium element, coordinate rational thermal treatment process to form carbonitride dispersion-strengthened and guarantee mutually high hardness and wear resistance.Because Martensite Stainless Steel used has high tenacity, wear-resisting, anti-corrosion, greatly extended the work-ing life of hydrapulpter impeller.
Below the selection reason of each Constitution Elements content range of the present invention's Martensite Stainless Steel used is further explained as follows:
Carbon: form carbide, improve hardness and wear resistance, but increase fragility, also consume the chromium element in matrix simultaneously, solidity to corrosion is reduced, but too low carbon content can make again the hardness of steel not enough.Therefore, in steel of the present invention, the mass percent of carbon is controlled between 0.005 ~ 0.15%.
Nitrogen: the formation MX(M of being combined with carbon, niobium, v element refers to the metallic elements such as V, Nb, and X refers to C and N) type carbonitride nano-strengthening phase.Nitrogen content is too high, is easy to form thick carbonitride phase, is unfavorable for improving intensity and hardness, is too lowly not enough to again form enough carbonitride strengthening phases.Therefore, nitrogen in steel of the present invention mass percent be controlled at 0.005 ~ 0.10%.
Chromium: improve solidity to corrosion, but be also ferrite former simultaneously, form a large amount of δ-ferrites when therefore too high chromium content can cause final thermal treatment heating, be unfavorable for the raising of intensity and hardness.But the massfraction of chromium is lower than 12.5%, and the electropotential of matrix can significantly reduce, and reduces solidity to corrosion.Therefore, in steel of the present invention, the mass percent of chromium is controlled between 12.5 ~ 15.0%.
Nickel: austenite former, works to suppress δ-ferrite and forms.The quality percentage composition of nickel lower than 1.0% time, δ-ferritic formation while being not enough to suppress final thermal treatment heating, after surpassing 4.0%, its beneficial effect no longer increases, simultaneously expensive because of nickel, as far as possible few using.Therefore, in steel of the present invention, the mass percent of nickel is controlled between 1.0 ~ 4.0%.
Molybdenum: solution strengthening element, improve intensity and the hardness of steel, thereby improve wear resistance, be also improved the hardening capacity of steel simultaneously and prevent the effect of temper brittleness and improve the solidity to corrosion in non-oxidizing acid.But too high levels, can promote δ-ferritic formation.Therefore, in steel of the present invention, the mass percent of molybdenum is controlled between 0.4 ~ 1.0% respectively.
Vanadium and niobium: be MX type carbonitride strengthening phase forming element.Content is too low, be not enough to form enough MX type carbonitride strengthening phases, make the hardness of steel not enough, wear resistance reduces, too high levels, can in melting and process of setting, easily form thick carbonitride phase again, in final heat treated heat-processed, be difficult to dissolve in austenite, be unfavorable for improving intensity and hardness.Therefore,, in steel of the present invention, the mass percent of vanadium and niobium is controlled at respectively between 0.5 ~ 1.2% and 0.05 ~ 0.50%.
Manganese: austenite former, has the effect that while suppressing final thermal treatment heating, δ-ferrite forms, but the effect of solidity to corrosion and toughness is not so good as to nickel.In steel of the present invention, control the mass percent of manganese between 0.5 ~ 2.0%.
Silicon, p and s: as impurity element, its quality percentage composition is controlled at respectively Si≤1.0%, P :≤0.030%, S :≤0.010%.
In the manufacture method of hydrapulpter impeller of the present invention, the object of anneal is to reduce hardness, eliminates casting stress, is convenient to mechanical workout.The object of quench treatment is for obtaining whole lath martensites and a small amount of residual carbon compound, improves intensity, hardness and the wear resistance of steel.If quenching temperature is too low can not get whole austenites, can not get whole martensite after cooling, quenching temperature is too high, there will be δ-ferrite on the one hand, also can waste energy on the other hand.The object of temper is the toughness of eliminating quenching stress and increasing steel on the one hand, is by controlling separating out of carbonitride, making it play dispersion-strengthened, thereby guarantee that steel has higher hardness and wear resistance on the other hand.Tempering temperature is lower than 550 ℃, and deficiency, so that carbonitride is separated out completely, higher than 700 ℃, can make again the lower hardness of steel, affects wear resistance.
The present invention compared with prior art, its advantage is: the Martensite Stainless Steel that hydrapulpter impeller of the present invention adopts is after final thermal treatment, be organized as the carbonitride phase of the granular high rigidity that distributing on lath-shaped tempered martensite matrix, both there is good toughness and solidity to corrosion, there is again high hardness and wear resistance, greatly improved the work-ing life of hydrapulpter impeller.
Embodiment
Table 1 has been listed the chemical composition of hydrapulpter used for impeller Martensite Stainless Steel of the present invention.Casting impeller after the melting of employing medium-frequency induction furnace, after the cold annealing of 700 ℃ of maintenance 4h stoves, mechanical workout, then obtains hydrapulpter impeller finished product of the present invention through final thermal treatment.Final Heat Treatment Process is in Table 2.From impeller body sampling, do mechanical property test, test its Rockwell hardness and Xia Shi v-notch sample ballistic work, list in table 2.The impeller finished product of manufacturing is arranged on hydrapulpter and carries out test in place, and also list in table 2 work-ing life.Data from table 2 can be found out, adopt the hydrapulpter impeller of manufacture of the present invention to have good hardness and toughness cooperation.Compared with prior art, hydrapulpter impeller of the present invention extends on-the-spot work-ing life greatly.
The chemical composition (wt.%) of table 1 long lifetime of the present invention hydrapulpter used for impeller Martensite Stainless Steel
The performance of table 2 long lifetime of the present invention hydrapulpter impeller
Claims (2)
1. a long lifetime hydrapulpter impeller, adopts Martensite Stainless Steel manufacture, it is characterized in that the chemical composition of Martensite Stainless Steel is by mass percentage: carbon 0.005 ~ 0.15, silicon 0 ~ 1.0, manganese 0.5 ~ 2.0, phosphorus 0 ~ 0.030, sulphur 0 ~ 0.010, chromium 12.5 ~ 15.0, nickel 1.0-4.0, molybdenum 0.4 ~ 1.0, nitrogen 0.005 ~ 0.10, niobium 0.05 ~ 0.50, vanadium 0.5-1.2, surplus is iron and inevitable impurity.
2. a preparation method for long lifetime hydrapulpter impeller as claimed in claim 1, comprises the following steps: 1) by the feedstock composition of Constitution Elements direct casting after melting; 2) annealing; 3) mechanical workout; 4) final thermal treatment, is characterized in that: step 2) annealing process be chilled to 600 ℃, the air cooling of coming out of the stove for stove after being heated to 680-710 ℃ of maintenance 1-6h; Step 4) treatment process comprises quench treatment and temper successively, and wherein quench treatment keeps 30-120min, then oil cooling or air cooling for being heated to 880-1050 ℃; Temper keeps 30-120min, then oil cooling or air cooling for being heated to 550 ℃-700 ℃.
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| CN201210388003.8A CN102899590B (en) | 2012-10-13 | 2012-10-13 | Long-service-life impeller of hydrapulper and production method thereof |
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| CN103484621A (en) * | 2013-09-26 | 2014-01-01 | 无锡阳工机械制造有限公司 | Heat treatment method for stainless steel |
| CN113084087A (en) * | 2021-03-02 | 2021-07-09 | 赛普工业研究院(安阳)有限公司 | Ferrite control method of martensitic stainless steel 2Cr13 blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1918308A (en) * | 2004-07-07 | 2007-02-21 | 杰富意钢铁株式会社 | Method for producing high tensile steel sheet |
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| CN1918308A (en) * | 2004-07-07 | 2007-02-21 | 杰富意钢铁株式会社 | Method for producing high tensile steel sheet |
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Effective date of registration: 20160315 Address after: 255086 Zibo high tech Industrial Development Zone, Shandong Province, Chuang Chuang D block, 1012 Patentee after: Shandong University of Technology Address before: 255086 Zibo high tech Industrial Development Zone, Shandong Province, Chuang Chuang D block, 1012 Patentee before: Shandong University of Technology Patentee before: Zibo Jufeng Machinery Co.,Ltd. |
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