CN1367270A - Production process for centrifugal casting high wear-resistant alloy cast-iron composite wear-resisting roll collar - Google Patents
Production process for centrifugal casting high wear-resistant alloy cast-iron composite wear-resisting roll collar Download PDFInfo
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- CN1367270A CN1367270A CN 01134317 CN01134317A CN1367270A CN 1367270 A CN1367270 A CN 1367270A CN 01134317 CN01134317 CN 01134317 CN 01134317 A CN01134317 A CN 01134317A CN 1367270 A CN1367270 A CN 1367270A
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Abstract
A production process for antifriction roll ring made of high-antiwear alloy castiron uses centrifugal composite pouring process and heat treatment process, and is characterized by that the external layer of the said composite antifriction roll ring contains vanadium and several trace elements alloy cast iron, its composition (wt%) is C 1.7-3.0, Cr 11.0-20.0, V 0.3-1.2, Mo 1.0-2.0, Ni less than or equal to 1.5, Mn less than or equal to 1.5, Cu less than or equal to 1.5, N 0.06-0.15, Ce 0.01-0.04 and Ti less than or equal to 0.10, and its internal layer is a high-strength nodule graphite cast iron. Its wearability is high, internal stress is small, cracking tendency is small and service life is long, it can be used for crushing gangue, cement clinker and other hard materials.
Description
The invention provides a kind of outer composition of layer of composite roll circle, centrifugal composite casting and thermal treatment process.
With correlation technique of the present invention the outer field chromium manganese of the compound wear resistant double-rolle roller rim molybdenum cast iron of China patent No. ZL94 1 009424 is arranged, its composition (%) is: C1.9～2.6, Cr11.0～14.5, Mn0.6～2.8, Mo1.0～1.9, Cu0.9～1.5, V0.08～0.20, RE0.01～0.02.The high chrome molybdenum cast iron of U.S. Climax company, its composition (%) is: C2.8～3.5, Cr14～16, Mo1.9～2.2, Mn0.6～0.9.Britain BS, 4844:Part3:1975 wear resistant white iron rank 3A, its composition (%) is: C2.4～3.0, Cr14～17, Mo0～2.5, Ni0～1.0, Mn0.5～1.5, Cu0～1.2.
The double-rolle roller rim product of domestic present use has three kinds, and first kind is medium high carbon hollow steel rolls circle, and second kind is middle manganese magnesium iron roller circle, and the third is a chill cast share iron roll circle.Preceding two kinds wear no resistance, and work-ing life is low.Be no more than 40 days first kind of entire life, and second kind higher owing to manganese content, smelts the composition fluctuation greatly, and stability is poor, and fluctuate greatly work-ing life, and easily cracked, and be no more than 4 months work-ing life the highest.These two kinds of roller circles can't reach the requirement in small, broken bits of colliery wastes brick.Chill cast share iron roll circle just has high slightly work-ing life if hardness reaches more than the HRC50.
The object of the present invention is to provide and a kind ofly have high-wearing feature, shock-resistant, high tenacity, high work-ing life, ratio of performance to price excellence, be applicable to mechanically resistant material high wear-resistant alloy cast-iron composite wear-resisting roll collar production technique in small, broken bits such as coal gangue, cement clinker and smallstone earth.
Of the present invention constituting:
1. adopt the cladding material of high abrasion-resistant alloy cast iron as the roller circle, it contains higher content of vanadium, increases wear-resistant phase Cr
7C
3The hardness of phase, refining eutectic carbide and cast structure, thereby the wear resistance and the toughness of raising cast alloy iron.A small amount of and trace element such as nickel, titanium can further improve toughness, the reasonable use of nickel, molybdenum, manganese, nitrogen can be brought into play the interaction between each element, improves the tissue of cast alloy iron, improve its hardening capacity, thereby further improve its comprehensive mechanical property and processing performance.The chemical ingredients of high abrasion-resistant alloy cast iron (%) is: C1.7～3.0, Cr11.0～20.0, V0.3～1.2, Mo1.0～2.0, Ni≤1.5, Mn≤1.5, Cu≤1.5, N0.06～0.15, Ce0.01～0.04, Ti≤0.10.
2. adopt the rotary casting compound casting technique.With induction furnace, cupola melting high abrasion-resistant alloy cast iron and spheroidal graphite cast iron, the composition of spheroidal graphite cast iron (%) is: C3.7～4.0, Si2.2～2.6, Mn≤0.6, P≤0.03, S≤0.02, RE≤0.03, Mg≤0.04, surplus are Fe.Adopt centrifugal casting technique, the opening of high abrasion-resistant alloy cast iron watered temperature and is higher than 1440 ℃, surpasses 1/2 back adding covering slag when high abrasion-resistant alloy cast iron pours into mold.Watered whole high abrasion-resistant alloy cast irons, and treated that its surface temperature is cooled to pour into spheroidal graphite cast iron below 1000 ℃.It is 1320～1440 ℃ that the opening of spheroidal graphite cast iron watered temperature, treats that spheroidal graphite cast iron solidifies the back fully and shuts down.
3. adopt and quench and tempering heat treatment process.After whizzer is shut down, the demoulding immediately, the roller circle red send into annealing furnace, stove was cold then in 4 hours to be heated to 920～1000 ℃ of insulations, was lower than 100 ℃ and came out of the stove.
Quench and tempering.The roller circle is put into quenching furnance, 20～50 ℃/h of control rate of heating, and furnace temperature is raised to 940～1000 ℃ of insulations 3～4 hours, quench by taking out in the stove, 5～10 ℃/min of controlled chilling speed is cooled to 550～450 ℃ and controls with 10～20 ℃/h again and be cooled to be lower than 60 ℃, and quenching finishes.Tempering immediately then, tempering temperature are controlled at 450～580 ℃ of scopes, and it is cold to be incubated 3 hours stoves.
The invention has the advantages that:
1. solved the difficult problem of the efficient tooling in small, broken bits of China's coal gangue, cement clinker and shale.
2. by adding higher content of vanadium and multiple a small amount of and trace element, improved the wear resistance and the toughness of roll surface.
3. by the casting of two kinds of metal composite, make that the high-wearing feature and the high-strong toughness of roller circle obtains good unification after the thermal treatment.
4. thermal treatment process is easy to control, roller circle stability is good after the thermal treatment, the outer hardened depth of roller, quench-hardened case is even by showing degree of depth Hardness Distribution, between HRC56～63, internal stress is little, the antivibration ability is strong, and to coal gangue in small, broken bits or smallstone earth, be 40 times of hollow steel rolls circle work-ing life, be more than 6 times of middle manganese magnesium iron roller circle, be more than 3 times of chill cast share iron roll circle.
5. high speed equipment in small, broken bits uses high abrasion-resistant alloy cast iron composite roll circle of the present invention, guarantees to produce normally to carry out, and reduces the number of times of maintenance roll change circle, has improved labour productivity, saves maintenance cost.
Embodiment
Finished product double-rolle roller rim size: 700 * 500mm, thick 70mm, high abrasion-resistant alloy cast iron bed thickness 30mm wherein, spheroidal graphite cast iron bed thickness 40mm.
High abrasion-resistant alloy cast iron composition (%) is: C2.65, Cr14.70, Mo1.54, Ni0.82, Mn0.65, Cu0.35, N0.06, Ce0.015, Ti0.02, surplus are Fe.The high abrasion-resistant alloy cast iron teeming temperature is 1448 ℃, has watered 2/3 iron liquid and has added covering slag, has watered high abrasion cast iron and has treated that surface temperature begins to pour into a mould spheroidal graphite cast iron when dropping to 1000 ℃, and the teeming temperature of spheroidal graphite cast iron is 1335 ℃.Treat that spheroidal graphite cast iron solidifies the back fully and shuts down, the demoulding immediately, with the roller circle red send into annealing furnace, anneal 950 ℃ of insulations of annealing temperature slow cooling in 3.5 hours.The roller circle quenches after mechanical workout, is heated to 960 ℃ of insulations 2.5 hours, quenches by taking out in the stove, and 4～6 ℃/min of controlled chilling speed is cooled to 500 ℃ and is cooled to be lower than 60 ℃ with 20 ℃/h again, and quenching finishes.Tempering immediately then, tempering temperature was 480～540 ℃ of scope insulations 3 hours, and stove is as cold as below 120 ℃ and comes out of the stove.
Claims (2)
1. centrifugal casting high wear-resistant alloy cast-iron composite wear-resisting roll collar.It is characterized in that composite anti-wear roll ring is outer for containing higher vanadium and multiple a small amount of high abrasion-resistant alloy cast iron that reaches the common composite alloying of trace alloying element, composition (%) is: C1.7～3.0, Cr11.0～20.0, V0.3～1.2, Mo1.0～2.0, Ni≤1.5, Mn≤1.5, Cu≤1.5, N0.05～0.15, Ce0.01～0.04, Ti≤0.10, surplus is Fe, and internal layer is a high-strength ductile cast iron.
2. an antiwear roller ring production technique is made up of composite casting and thermal treatment process, it is characterized in that:
A. composite casting technology: by medium-frequency induction furnace, cupola melting high abrasion-resistant alloy cast iron and spheroidal graphite cast iron.Adopt centrifugal casting technique, the opening of high abrasion-resistant alloy cast iron watered temperature and is higher than 1440 ℃, surpasses 1/2 back adding covering slag when high abrasion-resistant alloy cast iron pours into centrifugal casting die.Watered whole high abrasion-resistant alloy cast irons, and treated that its surface temperature is cooled to pour into spheroidal graphite cast iron below 1000 ℃.It is 1320～1440 ℃ that the opening of spheroidal graphite cast iron watered temperature.Spheroidal graphite cast iron has watered, and treats to solidify fully the back and shuts down.
B. thermal treatment process
After rotational casting is shut down, the demoulding immediately, the roller circle red send into annealing furnace, be heated to 920～1000 ℃ of insulations 4 hours, stove is cold then, is lower than 100 ℃ and comes out of the stove.
Quench and tempering: the roller circle is put into quenching furnance, 20～50 ℃/h of control rate of heating, furnace temperature are raised to 940～1000 ℃ of insulations 3～4 hours, quench by taking out in the stove, 5～10 ℃/min of controlled chilling speed, be cooled to 550～450 ℃ again controlled chilling speed be cooled to be lower than 60 ℃ with 10～20 ℃/h, quenching finishes.Carry out tempering then immediately, tempering temperature is 450～580 ℃ of scopes, and it is cold to be incubated 3 hours stoves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134317 CN1367270A (en) | 2001-10-30 | 2001-10-30 | Production process for centrifugal casting high wear-resistant alloy cast-iron composite wear-resisting roll collar |
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| CN 01134317 CN1367270A (en) | 2001-10-30 | 2001-10-30 | Production process for centrifugal casting high wear-resistant alloy cast-iron composite wear-resisting roll collar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453674C (en) * | 2005-11-10 | 2009-01-21 | 西安交通大学 | Low cost, high-wearability hypereutectic high chromium cast iron and its production method |
| EP2059621A1 (en) * | 2006-09-08 | 2009-05-20 | F.L. Smidth & Co. A/S | Temperature- stable cast iron alloy and use of said alloy |
| CN110449559A (en) * | 2019-09-06 | 2019-11-15 | 朱东阁 | Bimetallic grinding roller of Raymond mill/bull ring and its biliquid centre spinning method |
-
2001
- 2001-10-30 CN CN 01134317 patent/CN1367270A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453674C (en) * | 2005-11-10 | 2009-01-21 | 西安交通大学 | Low cost, high-wearability hypereutectic high chromium cast iron and its production method |
| EP2059621A1 (en) * | 2006-09-08 | 2009-05-20 | F.L. Smidth & Co. A/S | Temperature- stable cast iron alloy and use of said alloy |
| EP2059621A4 (en) * | 2006-09-08 | 2012-10-10 | Smidth & Co As F L | Temperature- stable cast iron alloy and use of said alloy |
| CN110449559A (en) * | 2019-09-06 | 2019-11-15 | 朱东阁 | Bimetallic grinding roller of Raymond mill/bull ring and its biliquid centre spinning method |
| CN110449559B (en) * | 2019-09-06 | 2021-03-02 | 朱东阁 | Bimetal Raymond machine grinding roller/grinding ring and double-liquid centrifugal casting method thereof |
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