CN103757545B - Rolling mill guiding high temperature wear resistant alloy material and rolling mill guiding heat treating method - Google Patents
Rolling mill guiding high temperature wear resistant alloy material and rolling mill guiding heat treating method Download PDFInfo
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Abstract
The invention discloses a kind of rolling mill guiding high temperature wear resistant alloy material and rolling mill guiding heat treating method, each component formation by mass percentage of this high temperature wear resistant alloy material is: C:1.45 ~ 1.6%, Cr:11 ~ 12.5%, surplus is Fe, and the ratio of mass percent between Cr and C is: Cr/C=7 ~ 8.First rolling mill guiding heat treating method comprises the steps:, to the Low-temperature stress-relief annealing carrying out rolling mill guiding 200 DEG C ~ 300 DEG C; Then, through the preheating of 500 DEG C ~ 600 DEG C, and carry out the solution treatment of 960 DEG C ~ 1050 DEG C; Finally, the high tempering of 440 DEG C ~ 480 DEG C and the low-temperaturetempering of 270 DEG C ~ 290 DEG C is carried out.Rolling mill guiding high temperature wear resistant alloy material of the present invention and rolling mill guiding heat treating method, have can improve guide and guard material high temperature abrasion resistance, high-temperature hot epistasis and thermal stability, make to improve the work-ing life of rolling mill guiding the advantages such as 3 ~ 4 times.
Description
Technical field
The invention belongs to preparation and the Application Areas thereof of type material, especially relate to a kind of rolling mill guiding high temperature wear resistant alloy material and rolling mill guiding heat treating method.
Background technology
Guide and guard are in section rolling process, and making steel rolling part exactly, stably enter by set direction and state and derive the device of roll pass, is one of key equipment on high speed bar and wire rod rolling process production line.Since rolling guide substitutes sliding guide, work-ing life of guide and guards, product surface quality and operating rate of rolling mill all obtain and significantly improve, but because of its long term operation in high temperature environments and bear again the impact of sharp thermal quench, make the work-ing life of guide and guard short, consumption large, change frequent, and become one of bottleneck that restriction steel at present produce.Early stage guide and guard material is plain carbon stool and cast iron, and its Wear Resistance is poor, work-ing life is low; Use WC Wimet afterwards, although effectively improve its wear resistance, still there is large, the resistance to sharp thermal quench of fragility poor, " steel bonding " phenomenon can occur in using, cause red steel can not rolling smoothly, and then affect the surface quality of product; Ni-based guide and guard material thermal shock resistance and high temperature oxidation resistance good, but it is expensive, deficiency in economic performance; The DF-2 deflector roll of Hefei Orient Energy Saving Technology Co., Ltd.'s development in early stage, its alloy rigidity is high, wear resistance good, but Cr content is 24% ~ 25%, easily cracks.At present, rolling mill guiding adopts austenitic heat-resistance steel mostly, and this material has good high-temperature stability and toughness, but its high temperature abrasion resistance is poor, causes product serious wear, and steel transportation amount is generally no more than 800 tons, and work-ing life is low.
Because rolling mill guiding in working process directly contacts with red steel, therefore its key property is that requirement should have good high temperature abrasion resistance, to improve its work-ing life.At present, traditional guide and guard material can not meet its requirement, and therefore, research and development new high temperature wear resistant alloy is extremely urgent.
Summary of the invention
The present invention is for avoiding the weak point that exists in above-mentioned prior art, providing a kind of rolling mill guiding high temperature wear resistant alloy material and rolling mill guiding heat treating method, with solve traditional guide and guard material under arms time serious wear, life-span short, replace the problems such as frequent.
The present invention be technical solution problem by the following technical solutions.
Rolling mill guiding high temperature wear resistant alloy material, be characterized in, each component formation by mass percentage of this high temperature wear resistant alloy material is: C:1.45 ~ 1.6%, Cr:11 ~ 12.5%, surplus is Fe, and the ratio of mass percent between Cr and C is: Cr/C=7 ~ 8.
A kind of rolling mill guiding high temperature wear resistant alloy material of the present invention also has following technical characterstic.
This high temperature wear resistant alloy material further comprises Si and Mn, and the mass percent shared by Si and Mn is respectively: Si:0.8 ~ 1.2%, Mn:0.4 ~ 0.8%.
This high temperature wear resistant alloy material further comprises Ni, Mo and Cu; Mass percent shared by Ni, Mo and Cu is respectively: Ni0.4 ~ 0.6%, Mo0.05 ~ 0.1%, Cu0.15 ~ 0.2%.
Present invention also offers a kind of rolling mill guiding heat treating method.
Rolling mill guiding heat treating method, is characterized in, rolling mill guiding is made up of the high temperature wear resistant alloy material that claim is mentioned above, and its heat treating method comprises the steps:
Step 1: first, carries out Low-temperature stress-relief annealing to rolling mill guiding at 200 DEG C ~ 300 DEG C temperature, and the time is 4 hours ~ 6 hours, and stove is chilled to room temperature;
Step 2: then, through the preheating of 500 DEG C ~ 600 DEG C, is incubated 4 hours, and carries out the solution treatment 2 hours ~ 3 hours of 960 DEG C ~ 1050 DEG C;
Step 3: last, is heated to 440 DEG C ~ 480 DEG C with the rate of heating of 80 DEG C ~ 100 DEG C/h; Carry out 440 DEG C ~ 480 DEG C high temperings of 2 hours ~ 3 hours, air cooling is to room temperature;
Step 4: finally 270 DEG C ~ 290 DEG C low-temperaturetemperings 5 hours, cool to room temperature with the furnace.
In described step 1, the heat-up rate that described Low-temperature stress-relief annealing process is heated to 200 DEG C ~ 300 DEG C by room temperature is 60 DEG C ~ 80 DEG C/h.
In described step 2, the heat-up rate that described solution treatment process is heated to 960 DEG C ~ 1050 DEG C by room temperature is 90 DEG C ~ 110 DEG C/h.
In described step 3, the heat-up rate that described high tempering process is heated to 440 DEG C ~ 480 DEG C by room temperature is 80 DEG C ~ 100 DEG C/h.
In described step 4, the heat-up rate that described low-temperaturetempering process is heated to 270 DEG C ~ 290 DEG C by room temperature is 15 DEG C ~ 20 DEG C/h.
Compared with the prior art, beneficial effect of the present invention is embodied in:
Rolling mill guiding high temperature wear resistant alloy material of the present invention and rolling mill guiding heat treating method, by the mass percent of the alloying elements such as adjustment carbon, chromium, manganese, its component is: C content 1.45 ~ 1.6wt%, Cr content 11 ~ 12.5wt%, Mn content 0.4 ~ 0.8wt% etc., obtain even, discontinuous high abrasion tissue (Cr, Fe)
7c
3(HV1200 ~ 1800); Add alloying element Ni, Mo, Cu simultaneously, to improve hardening capacity, produce secondary hardening, and make carbide tiny and be uniformly distributed.Its thermal treatment process is: first carry out stress relief annealing at the low temperature of 200 ~ 300 DEG C; Then through the preheating of 500 ~ 600 DEG C, and the solution treatment of 960 ~ 1050 DEG C is carried out; Finally carry out the high tempering of 440 ~ 480 DEG C and the low-temperaturetempering of 270 ~ 290 DEG C, with effective solid solution alloy element, and make all even discontinuous recipittaion of proeutectoid carbide, realize effectively eliminating internal stress, prevent crack initiation.This invention significantly improves the high temperature abrasion resistance of guide and guard material, high-temperature hot epistasis and thermal stability, compared with traditional guide and guard material, can improve work-ing life 3 ~ 4 times, economic benefit and social benefit obvious.
Chromium base high temperature wear resistant alloy of the present invention has very high hardness and excellent impact property, and its wear resistance is higher than common alloy steel, the carbide (Cr, Fe) that a large amount of chromium element carburets wherein existed generate
7c
3, its hardness can up to HV1300 ~ 1800.Therefore, adjustment carbon content can make the hardness of guide and guard material reach HRC60 ~ 65, and not only hardness is high for it, but also has good high temperature resistance and corrosion resistance concurrently; And C, Cr and Mo of adding can put forward heavy alloyed hardening capacity preferably, the steel after thermal treatment is made to have higher intensity and wear resistance; Cu can also make steel have good plasticity and thermal conductivity, can use under milling train swashs the severe environment of thermal quench and not burst.
Rolling mill guiding high temperature wear resistant alloy material of the present invention and rolling mill guiding heat treating method, have can improve guide and guard material high temperature abrasion resistance, high-temperature hot epistasis and thermal stability, make to improve the work-ing life of rolling mill guiding the advantages such as 3 ~ 4 times.
Below by way of embodiment, the invention will be further described.
Embodiment
Rolling mill guiding high temperature wear resistant alloy material, its each component formation is by mass percentage: C:1.45 ~ 1.6%, Cr:11 ~ 12.5%, and surplus is Fe, and the ratio of mass percent between Cr and C is: Cr/C=7 ~ 8.
The preparation process of rolling mill guiding high temperature wear resistant alloy material of the present invention and rolling mill guiding comprises 5 steps below, first obtains liquid wear resistant alloy material, then the wear resistant alloy material of liquid state is cast as rolling mill guiding.
These 5 steps are followed successively by:
A. prepare burden and feed: the starting material such as steel scrap, steel cuttings, the pig iron, pure nickel, molybdenum-iron, ferrochrome, ferromanganese, ferrosilicon, fine copper being carried out raw-material batching by the mass percent of following chemical composition: C1.45 ~ 1.6wt%, Si0.8 ~ 1.2wt%, Mn0.4 ~ 0.8wt%, P≤0.03wt%, S≤0.03wt%, Cr11 ~ 12.5wt%, Ni0.4 ~ 0.6wt%, Mo0.05 ~ 0.1wt%, Cu0.15 ~ 0.2wt%.Wherein, the mean carbon content of furnace charge is allocated into by the lower limit of specification composition, and starting material surface should without greasy dirt, without scab foreign material, the oxide skin that can not peel off; Then, reinforced in induction furnace.The starting material such as steel scrap, steel cuttings, the pig iron, pure nickel, molybdenum-iron, ferrochrome add at when filling with substance, and ferromanganese, ferrosilicon add in fusion process.Time reinforced, first add dead small in crucible bottom, dead small adds iron alloy, add middle block of material above, crucible edge adds bulk material, and fills up dead small densely in the gap of bulk material.
B. alloy melting: when starting to be energized, first supplies the power of about 60%, after rush of current stops, power is progressively enlarged to maximum value.Material is smash in the load melting rear attention in bottom, prevents scaffolding, and constantly reinforced to keep furnace charge consolidation.After major part is load melting, slag making materials (lime powder: the Fluorspar Powder=2:1) slag making adding 1.2% covers molten steel.When furnace charge about melting down 95%, get steel sample and carry out total analysis, and all the other furnace charges of 5% are added in stove.After slag chargeization is clear, on slag face, killing (lime powder: aluminium powder=1:2) carries out diffusive deoxidation.Meanwhile, according to the chemical composition of chemical composition analysis result adjustment molten steel, wherein silicon, Fe content in first 10 minutes of tapping by adding ferrosilicon, ferromanganese adjusts.When molten steel heating to 1560 DEG C and circle cup sample shrinks good time, extract half slag, insert the further deoxidation of silico-calcium of 0.2%, on the top of the slag, then spread the reductor of one deck lime powder and aluminium powder.When molten steel temperature reaches more than 1580 DEG C, remove whole slag, add the cryolite powder of 0.07% immediately and aluminium is vertically inserted furnace bottom.Then stir molten steel, power failure turndown is tapped, and obtains liquid high temperature wear resistant alloy material, i.e. alloy material molten steel.
For the molten steel of high temperature wear resistant alloy material, various foundry goods can be made as required, as the roller guide and guard unit of all size.When molten steel is cooled to 1530-1540 DEG C, cast is highly the rolling mill guiding of 20mm model, namely obtains guide and guard foundry goods after cooling.
C. annealing and roughing: the guide and guard foundry goods obtained by step b is heated to 200 ~ 300 DEG C by room temperature and carries out stress relief annealing, then adopts conventional knife to carry out machining to guide and guard foundry goods.
D. solution treatment and tempering: the guide and guard after step c machining are heated to 960 ~ 1050 DEG C by room temperature and carry out solution treatment, be then heated to 440 ~ 480 DEG C respectively and 270 ~ 290 DEG C carry out temper.
F. precision work: the guide and guard inserted tool after steps d temper is finish-machined to finished product guide and guard.
The detailed process manufacturing rolling mill guiding with high temperature wear resistant alloy material of the present invention is as follows:
A1: precision casting: get each starting material and to be made into compound by regulation proportioning stand-by, then prepare rolling mill guiding:
First, make guide and guard model with low-temperature wax basic mode material, obtain guide and guard model shell with silicon sol-water glass composite shell process for making shell.In silicon sol-water glass composite model Shell Preparation process, layer 2-4 silicon sol first smeared by guide and guard model, be coated with 3-5 layer water glass and after steam dewaxing, obtain guide and guard model shell;
Then, roasting guide and guard model shell, maturing temperature is 950-1000, and DEG C soaking time is 40 minutes.After roasting terminates, the compound of preparation is poured in guide and guard model shell and pour into a mould; The tapping temperature of molten iron is 1600-1620 DEG C; Teeming temperature is 1530-1540 DEG C; Guide and guard model shell temperature is 450-550 DEG C; After cast, the guide and guard of making are naturally cooled to room temperature, after removing gating system, obtain guide and guard;
B1: annealing: the guide and guard of being processed into by step a are incubated 4 ~ 6h by room temperature carry out stress relief annealing with heating rate to 200 ~ 300 of 60 ~ 80 DEG C/h DEG C, and stove is chilled to room temperature subsequently;
C1: roughing: adopt conventional knife to carry out machining to the guide and guard that step b obtains;
D1: solution treatment: the guide and guard after machining are heated to 500 ~ 600 DEG C of insulation 4h by room temperature, then carry out solution treatment insulation 2 ~ 3h with heating rate to 960 ~ 1050 of 90 ~ 110 DEG C/h DEG C, air-cooled to room temperature subsequently;
E1: tempering: the guide and guard after solution treatment are incubated 2 ~ 3h by room temperature with heating rate to 440 ~ 480 of 80 ~ 100 DEG C/h DEG C tempering, and air cooling is to room temperature; Then be heated to 270 ~ 290 DEG C of tempering 5h with the heat-up rate of 15 ~ 20 DEG C/h, cool to room temperature with the furnace;
F1: precision work: the guide and guard inserted tool after temper is finish-machined to finished product guide and guard.
A large amount of even, discontinuous high abrasion tissues (Cr, Fe) is contained in this high temperature wear resistant alloy material
7c
3, its hardness is HV1300 ~ 1800, and therefore, compared with traditional guide and guard material, the work-ing life of the new high temperature wear resistant alloy of the present invention's development improves greatly.For the rolling mill guiding of height 20mm model, the guide and guard of this model tradition work-ing life---steel transportation amount is generally all below 800 tons, and the work-ing life of this new high temperature wear resistant alloy guide and guard---steel transportation amount is generally all more than 3300 tons, even can reach 4050 tons, make improve 3 ~ 4 times the work-ing life of rolling mill guiding.This high temperature wear resistant alloy material also includes impurity P and S, wherein will guarantee that the scope of the mass percent of P and S is: P≤0.03%, S≤0.03%, to improve metallurgical quality, prevent hot-short and cold short.
This high temperature wear resistant alloy material further comprises Si and Mn, and the mass percent shared by Si and Mn is respectively: Si:0.8 ~ 1.2%, Mn:0.4 ~ 0.8%.By adding these two kinds of metals of Si and Mn, to improve hardening capacity and the toughness of guide and guard.
This high temperature wear resistant alloy material further comprises Ni, Mo and Cu; Mass percent shared by Ni, Mo and Cu is respectively: Ni0.4 ~ 0.6%, Mo0.05 ~ 0.1%, Cu0.15 ~ 0.2%.
By adding these three kinds of metals of Ni, Mo and Cu, the hardening capacity of high temperature wear resistant alloy material can be improved, producing secondary hardening, and make carbide tiny and be uniformly distributed.
Rolling mill guiding heat treating method, is characterized in, rolling mill guiding is made up of the high temperature wear resistant alloy material that claim is mentioned above, and its heat treating method comprises the steps:
Step 1: first, carries out Low-temperature stress-relief annealing to rolling mill guiding at 200 DEG C ~ 300 DEG C temperature, and the time is 4 hours ~ 6 hours, and stove is chilled to room temperature;
Step 2: then, through the preheating of 500 DEG C ~ 600 DEG C, is incubated 4 hours, and carries out the solution treatment 2 hours ~ 3 hours of 960 DEG C ~ 1050 DEG C;
Step 3: last, be heated to 440 DEG C ~ 480 DEG C with the rate of heating of 80 DEG C ~ 100 DEG C/h, carry out 440 DEG C ~ 480 DEG C high temperings of 2 hours ~ 3 hours, air cooling is to room temperature;
Step 4: finally 270 DEG C ~ 290 DEG C low-temperaturetemperings 5 hours, cool to room temperature with the furnace.
In described step 1, the heat-up rate that described Low-temperature stress-relief annealing process is heated to 200 DEG C ~ 300 DEG C by room temperature is 60 DEG C ~ 80 DEG C/h.
In described step 2, the heat-up rate that described solution treatment process is heated to 960 DEG C ~ 1050 DEG C by room temperature is 90 DEG C ~ 110 DEG C/h.
In described step 3, the heat-up rate that described high tempering process is heated to 440 DEG C ~ 480 DEG C by room temperature is 80 DEG C ~ 100 DEG C/h.
In described step 4, described low-temperaturetempering process by room temperature be heated to 270 ~ heat-up rate of DEG C 290 DEG C is 15 DEG C ~ 20 DEG C/h.
Milling train new high temperature wear resistant alloy material provided by the invention, on the basis of traditional chromium base high temperature wear resistant alloy, by adjusting chemical composition and using different thermal treatment process, to improve alloy rigidity and toughness, thus meet the severe Working environment of guide and guard material and high performance requriements.Each component of high temperature wear resistant alloy material of the present invention is: C1.45 ~ 1.6wt%(mass percent), Si0.8 ~ 1.2wt%, Mn0.4 ~ 0.8wt%, P≤0.03wt%, S≤0.03wt%, Cr11 ~ 12.5wt%, Ni0.4 ~ 0.6wt%, Mo0.05 ~ 0.1wt%, Cu0.15 ~ 0.2wt%.Wt% represents mass percent.The materials such as Si, Mn, Ni, Mo and Cu are addible material, thus the characteristic such as the hardening capacity of raising alloy material and toughness.
C content is C1.45 ~ 1.6wt%, and C is coordinated with alloying element, forms high rigidity and the M of Dispersed precipitate
7c
3type alloy carbide, ensures that alloy has high hardness, wear resistance and red hardness; Si content is 0.8 ~ 1.2wt%, Mn content is 0.4 ~ 0.8wt%, makes alloy have good solid solution strengthening effect, puies forward heavy alloyed heat resistance; Cr content is 11 ~ 12.5wt%, is conducive to putting forward heavy alloyed hardening capacity and wear resistance, and forms fine and close chromium oxide film at alloy surface, and to strengthen antioxidant property, pre-adhesion resistant steel, promotes resistance to high temperature corrosion performance; Add the alloying elements such as a small amount of Ni, Mo, Cu and be convenient to be formed tiny, disperse in a large number, hard and alloy carbide that is not agglomeration, to cause secondary hardening effect, there is good toughness simultaneously.
Heat treated main process is: be incubated 4 ~ 6h carry out stress relief annealing with heating rate to 200 ~ 300 of 60 ~ 80 DEG C/h DEG C, stove is chilled to room temperature subsequently, so that low temperature elimination guide and guard within a short period of time internal stress; Then, be heated to 500 ~ 600 DEG C of insulation 4h with stove, object is preheating and reduces high temperature heating time; Carry out solution treatment insulation 2 ~ 3h with heating rate to 960 ~ 1050 of 90 ~ 110 DEG C/h DEG C again, air-cooled to room temperature subsequently, object is that carbide is fully dissolved, to put forward heavy alloyed red hardness; Subsequently, with heating rate to 440 ~ 480 of 80 ~ 100 DEG C/h DEG C tempering insulation 2 ~ 3h, and air cooling is to room temperature, to separate out proeutectoid carbide and to obtain few austenite and low unrelieved stress as far as possible; Finally, be heated to 270 ~ 290 DEG C of tempering 5h with the heat-up rate of 15 ~ 20 DEG C/h, cool to room temperature with the furnace, eliminate internal stress further.
Compared to the prior art, high temperature wear resistant alloy material of the present invention and guide and guard have the feature of the following aspects.
1, the present invention uses material different from existing guide and guard material.In order to improve hardness and the toughness of guide and guard material, the present invention devises a kind of novel chromium base high temperature wear resistant alloy.This alloy is at traditional chromium base high temperature wear resistant alloy (C:0.70-1.40wt%; Cr:8.00-14.00wt%), on basis, by adjustment alloying constituent, especially adjust carbon, chromium content, making C content be 1.45 ~ 1.6wt%, Cr content is 11 ~ 12.5wt%.The novel chromium base high temperature wear resistant alloy of the present invention's design has better wear resistance relative to traditional chromium base high temperature wear resistant alloy; But with the high Cr(content 24% ~ 25% used at present), high C(content 3.10 ~ 3.45%) compared with guide and guard material, its Cr, C content all reduce significantly, but Cr/C ratio remains between 7 ~ 8, this not only effectively reduces material cost, and the probability that material cracks also reduces greatly.Meanwhile, form proeutectoid carbide due to the alloying element such as C and Cr, Mo and cause secondary hardening, thus there is high wear resistance; Not molten carbide can also stop grain growth, puies forward heavy alloyed red hardness and wear resistance; And chromium can form fine and close, high-melting-point, stable oxide film (Cr
2o
3), there is good hot strength.In addition, the present invention also added a small amount of Cu to put forward heavy alloyed plasticity and thermal conductivity when starting material design, and carbide is attenuated, discontinuous, prevents guide and guard from producing in the environment for use of rapid heat cycle and bursts.
2, thermal treatment process of the present invention and guide and guard now use thermal treatment process different.In order to effectively improve the wear resistance at elevated temperature of guide and guard material, appropriate design of the present invention heat treatment mode is improving the weave construction of alloy.The thermal treatment process that current guide and guard material is conventional is " 1050 DEG C of quenchings+450 DEG C of tempering ", and the present invention adopts is the heat treatment mode of " low-temperature annealing+solution treatment+double tempering ", namely carries out stress relief annealing at the low temperature of 200 ~ 300 DEG C in advance; Then 500 ~ 600 DEG C of preheatings, then the solution treatment of 960 ~ 1050 DEG C is carried out; Finally carry out double tempering---one time 440 ~ 480 DEG C high tempering and the low-temperaturetempering of 270 ~ 290 DEG C, like this can effective solid solution alloy element, and make all even discontinuous recipittaion of proeutectoid carbide, can realize effectively eliminating internal stress, prevent the sprouting of crackle.
3, the matrix of material of the present invention is different from now using the matrix of guide and guard material.The matrix of material of the present invention is the plate martensite of high rigidity, and matrix is dispersed with the proeutectoid carbide (Cr, Fe) of fine particle shape and needle-like (threadiness) equably
7c
3, its microhardness is up to HV1300 ~ 1800; Relative to inductile austenite or the herring-bone form ledeburite organization matrix of traditional guide and guard material, the hardness of the guide and guard parts that material of the present invention is made is higher, and wear resistance is better, and impelling strength is also more superior; Meanwhile, the present invention is relative to the proeutectoid carbide (M of conventional high-chromium alloy
23c
6the microhardness of type complicated carbide is HV1200, M
3the microhardness of C type carbide is HV1000 ~ 1100), its hardness is higher, and wear resistance is better.
4, the performance and used life of guide and guard parts of the present invention is different from traditional guide and guard parts.Tradition guide and guard hardness HRC < 40, the working-surface hardness of guide and guard material of the present invention can reach HRC60 ~ 65, and impelling strength is 10 ~ 11J/m
2, there is good hot strength, high temperature abrasion resistance and thermal-shock resistance; Average oxidation speed 950 DEG C time is no more than 0.02g/m
2h, thus resistance of oxidation is strong, creep strength and lasting fatigue strength all higher.For the rolling mill guiding of height 20mm model, its work-ing life is compared with traditional guide and guard, steel transportation amount in guide and guard working process can being no more than 800 tons and rising to more than 3300 tons of current steel transportation amounts by traditional guide and guard steel transportation amount, the work-ing life of guide and guard of the present invention improves 3 ~ 4 times, significantly reduce the replacement frequency of guide and guard, substantially increase production efficiency, and can inlet guide be substituted, not only economic benefit is obvious, and social benefit is remarkable.
The scheme of several specific embodiment of the present invention is following (rolling mill guiding of height 20mm model).
Embodiment 1
Chemical composition: C1.45wt%, Si1.2wt%, Mn0.8wt%, P≤0.03wt%, S≤0.03wt%, Cr11wt%, Ni0.6wt%, Mo0.1wt%, Cu0.2wt%.
Thermal treatment process: with the heat-up rate of 80 DEG C/h at 200 DEG C of insulation 4h, stove is chilled to room temperature; Then 500 DEG C of insulation 4h are heated to stove; 960 DEG C of insulation 2h are heated to again with the heat-up rate of 110 DEG C/h, air-cooled to room temperature; Be incubated 2h with the speed of 80 DEG C/h 440 DEG C of tempering subsequently, air cooling is to room temperature; Finally after 270 DEG C of insulation 5h, cool to room temperature with the heat-up rate of 20 DEG C/h with the furnace.
Normal Temperature: micro-hardness: tiny in matrix, disperse, equally distributed carbide (Cr, Fe)
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3microhardness be HV1300 ~ 1520; Macrohardness: guide and guard worksheet surface layer hardness HRC60 ~ 62.5; Impelling strength: 11J/m
2.
Through experimental test, mean life is: steel transportation amount 3320 tons.
Embodiment 2
Chemical composition: C1.5wt%, Si1.0wt%, Mn0.7wt%, P≤0.03wt%, S≤0.03wt%, Cr11.5wt%, Ni0.5wt%, Mo0.08wt%, Cu0.18wt%.
Thermal treatment process: with the heat-up rate of 70 DEG C/h at 250 DEG C of insulation 5h, stove is chilled to room temperature; Then 550 DEG C of insulation 4h are heated to stove; 1000 DEG C of insulation 2h are heated to again with the heat-up rate of 100 DEG C/h, air-cooled to room temperature; Be incubated 2.5h with the speed of 90 DEG C/h 460 DEG C of tempering subsequently, air cooling is to room temperature; Finally after 280 DEG C of insulation 5h, cool to room temperature with the heat-up rate of 18 DEG C/h with the furnace.
Normal Temperature: micro-hardness: carbide (Cr, Fe) in matrix
7c
3microhardness be HV1450 ~ 1600; Macrohardness: guide and guard worksheet surface layer hardness HRC62 ~ 63.5; Impelling strength: 10.8J/m
2.
Through experimental test, mean life is: steel transportation amount 3530 tons.
Embodiment 3
Chemical composition: C1.55wt%, Si0.8wt%, Mn0.6wt%, P≤0.03wt%, S≤0.03wt%, Cr12wt%, Ni0.5wt%, Mo0.07wt%, Cu0.17wt%.
Thermal treatment process: with the heat-up rate of 60 DEG C/h at 300 DEG C of insulation 6h, stove is chilled to room temperature; Then 600 DEG C of insulation 4h are heated to stove; 1050 DEG C of insulation 2.5h are heated to again with the heat-up rate of 90 DEG C/h, air-cooled to room temperature; Be incubated 2.5h with the speed of 100 DEG C/h 480 DEG C of tempering subsequently, air cooling is to room temperature; Finally after 290 DEG C of insulation 5h, cool to room temperature with the heat-up rate of 15 DEG C/h with the furnace.
Normal Temperature: micro-hardness: carbide (Cr, Fe) in matrix
7c
3microhardness be HV1500 ~ 1650; Macrohardness: guide and guard worksheet surface layer hardness HRC63 ~ 64; Impelling strength: 10.7J/m
2.
Through experimental test, mean life is: steel transportation amount 3760 tons.
Embodiment 4
Chemical composition: C1.6wt%, Si0.8wt%, Mn0.5wt%, P≤0.03wt%, S≤0.03wt%, Cr12wt%, Ni0.4wt%, Mo0.06wt%, Cu0.16wt%.
Thermal treatment process: with the heat-up rate of 60 DEG C/h at 250 DEG C of insulation 5h, stove is chilled to room temperature; Then 600 DEG C of insulation 4h are heated to stove; 1050 DEG C of insulation 3h are heated to again with the heat-up rate of 90 DEG C/h, air-cooled to room temperature; Be incubated 3h with the speed of 100 DEG C/h 480 DEG C of tempering subsequently, air cooling is to room temperature; Finally after 290 DEG C of insulation 5h, cool to room temperature with the heat-up rate of 15 DEG C/h with the furnace.
Normal Temperature: micro-hardness: carbide (Cr, Fe) in matrix
7c
3microhardness be HV1600 ~ 1700; Macrohardness: guide and guard worksheet surface layer hardness HRC63 ~ 64.5; Impelling strength: 10.3J/m
2.
Through experimental test, mean life is: steel transportation amount 3910 tons.
Embodiment 5
Chemical composition: C1.6wt%, Si0.8wt%, Mn0.4wt%, P≤0.03wt%, S≤0.03wt%, Cr12.5wt%, Ni0.4wt%, Mo0.05wt%, Cu0.15wt%.
Thermal treatment process: with the heat-up rate of 60 DEG C/h at 300 DEG C of insulation 5h, stove is chilled to room temperature; Then 600 DEG C of insulation 4h are heated to stove; 1050 DEG C of insulation 3h are heated to again with the heat-up rate of 90 DEG C/h, air-cooled to room temperature; Be incubated 3h with the speed of 100 DEG C/h 480 DEG C of tempering subsequently, air cooling is to room temperature; Finally after 290 DEG C of insulation 5h, cool to room temperature with the heat-up rate of 15 DEG C/h with the furnace.
Normal Temperature: micro-hardness: carbide (Cr, Fe) in matrix
7c
3microhardness be HV1650 ~ 1800; Macrohardness: guide and guard worksheet surface layer hardness HRC64 ~ 65; Impelling strength: 10J/m
2.
Through experimental test, mean life is: steel transportation amount 4050 tons.
By above stress relief annealing, solid solution and high temperature and low-temperaturetempering process, can effective solid solution alloy element, and make all even discontinuous recipittaion of proeutectoid carbide, realize effectively eliminating internal stress, prevent crack initiation, improve the high temperature abrasion resistance of guide and guard material, high-temperature hot epistasis and thermal stability, and improve work-ing life, hardness can reach HRC60 ~ 65, and the life-span can improve 3 ~ 4 times relative to traditional guide and guard.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. rolling mill guiding high temperature wear resistant alloy material, it is characterized in that, each component formation by mass percentage of this high temperature wear resistant alloy material is: C:1.45 ~ 1.6%, Cr:11 ~ 12.5%, Si:0.8 ~ 1.2%, Mn:0.4 ~ 0.8%, Ni:0.4 ~ 0.6%, Mo:0.05 ~ 0.1%, Cu:0.15 ~ 0.2%, surplus is Fe, and the ratio of mass percent between Cr and C is: Cr/C=7 ~ 8;
The heat treating method of described high temperature wear resistant alloy material comprises the steps:
Step 1: first, carries out Low-temperature stress-relief annealing to rolling mill guiding at 200 DEG C ~ 300 DEG C temperature, and the time is 4 hours ~ 6 hours, and stove is chilled to room temperature;
Step 2: then, through the preheating of 500 DEG C ~ 600 DEG C, is incubated 4 hours, and carries out the solution treatment 2 hours ~ 3 hours of 960 DEG C ~ 1050 DEG C;
Step 3: last, be heated to 440 DEG C ~ 480 DEG C with the rate of heating of 80 DEG C ~ 100 DEG C/h, carry out 440 DEG C ~ 480 DEG C high temperings of 2 hours ~ 3 hours, air cooling is to room temperature;
Step 4: finally 270 DEG C ~ 290 DEG C low-temperaturetemperings 5 hours, cool to room temperature with the furnace.
2. rolling mill guiding heat treating method, is characterized in that, rolling mill guiding is made up of high temperature wear resistant alloy material according to claim 1, and its heat treating method comprises the steps:
Step 1: first, carries out Low-temperature stress-relief annealing to rolling mill guiding at 200 DEG C ~ 300 DEG C temperature, and the time is 4 hours ~ 6 hours, and stove is chilled to room temperature;
Step 2: then, through the preheating of 500 DEG C ~ 600 DEG C, is incubated 4 hours, and carries out the solution treatment 2 hours ~ 3 hours of 960 DEG C ~ 1050 DEG C;
Step 3: last, be heated to 440 DEG C ~ 480 DEG C with the rate of heating of 80 DEG C ~ 100 DEG C/h, carry out 440 DEG C ~ 480 DEG C high temperings of 2 hours ~ 3 hours, air cooling is to room temperature;
Step 4: finally 270 DEG C ~ 290 DEG C low-temperaturetemperings 5 hours, cool to room temperature with the furnace.
3. rolling mill guiding heat treating method according to claim 2, is characterized in that, in described step 1, the heat-up rate that described Low-temperature stress-relief annealing process is heated to 200 DEG C ~ 300 DEG C by room temperature is 60 DEG C ~ 80 DEG C/h.
4. rolling mill guiding heat treating method according to claim 2, is characterized in that, in described step 2, the heat-up rate that described solution treatment process is heated to 960 DEG C ~ 1050 DEG C by room temperature is 90 DEG C ~ 110 DEG C/h.
5. rolling mill guiding heat treating method according to claim 2, is characterized in that, in described step 3, the heat-up rate that described high tempering process is heated to 440 DEG C ~ 480 DEG C by room temperature is 80 DEG C ~ 100 DEG C/h.
6. rolling mill guiding heat treating method according to claim 2, is characterized in that, in described step 4, the heat-up rate that described low-temperaturetempering process is heated to 270 DEG C ~ 290 DEG C by room temperature is 15 DEG C ~ 20 DEG C/h.
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| CN104789851A (en) * | 2015-04-24 | 2015-07-22 | 合肥东方节能科技股份有限公司 | High-temperature wearing-resistance alloy material for rolling mill guide roller and preparation method of high-temperature wearing-resistance alloy material |
| CN106048398A (en) * | 2016-08-12 | 2016-10-26 | 合肥东方节能科技股份有限公司 | High-hardness alloy material and heat treatment method for guide and guard of rolling mill |
| CN107761004A (en) * | 2016-08-18 | 2018-03-06 | 合肥东方节能科技股份有限公司 | A kind of heat treatment method of rolling mill guiding alloy material and rolling mill guiding |
| CN106086694A (en) * | 2016-08-22 | 2016-11-09 | 合肥东方节能科技股份有限公司 | A kind of finishing mill guide wheel Hardmetal materials and heat treatment method thereof |
| CN108504987A (en) * | 2018-05-14 | 2018-09-07 | 合肥东方节能科技股份有限公司 | A kind of Carburization Treatment technique of wear-resisting rolling mill guiding |
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| TW200532033A (en) * | 2004-03-23 | 2005-10-01 | Hong-Jang Hsu | Alloy for engine parts and method of producing the same |
| CN103173681A (en) * | 2013-03-16 | 2013-06-26 | 江阴润源机械有限公司 | Cold rolled steel working roll using SKD-11 steel and production process thereof |
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| CN103173681A (en) * | 2013-03-16 | 2013-06-26 | 江阴润源机械有限公司 | Cold rolled steel working roll using SKD-11 steel and production process thereof |
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