CN104988452A - Manufacturing method of wear-resisting lining plate for rolling mill inlet guide - Google Patents
Manufacturing method of wear-resisting lining plate for rolling mill inlet guide Download PDFInfo
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- CN104988452A CN104988452A CN201510296425.6A CN201510296425A CN104988452A CN 104988452 A CN104988452 A CN 104988452A CN 201510296425 A CN201510296425 A CN 201510296425A CN 104988452 A CN104988452 A CN 104988452A
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Abstract
The invention discloses a manufacturing method of a wear-resisting lining plate for a rolling mill inlet guide, and belongs to the field of a wear-resisting lining plate. The manufacturing method comprises the steps: step one, a substrate is manufactured; step two, the substrate is subjected to surface degreasing and activation; step three, the substrate is preheated; step four, flame spray welding is carried out; and step five, post processing is carried out. The substrate material in the invention is forging 40 Cr hardened and tempered steel, and the material of a spray welding layer is self-fluxed alloy powder. The wear-resisting lining plate has the advantages that the tenacity is excellent; the surface hardness is high; the abrasion performance is excellent; the service life of the wear-resisting lining plate is obviously prolonged; the production efficiency of a rolling mill and the product dimensional precision are ensured; the production cost is reduced; according to the characteristic of a flame spray welding technology, after the spray welding layer is worn, spraying and refusion can be carried out repeatedly; the abrasive resistance is equivalent to the abrasive resistance after first spray welding, so that the wear-resisting lining plate which loses efficacy can be easily repaired.
Description
Technical field
The present invention relates to abrasion-proof backing block preparation field, particularly relate to a kind of preparation method of rolling mill inlet guide abrasion-proof backing block.
Background technology
Inlet guide refers to online, in rolling bar process, before the roll pass being arranged on milling train or collars pass, guide rolled piece to enter the guide and guards of pass by set direction and state.Intaking guide fittings comprises the part such as guide beam, guide box, base, importing part (comprising inlet guide, inlet tube and hydraucone etc.), retainer, bearing.In intaking guide fittings, inlet guide is one of crucial control piece of entering of rolled piece, and it is arranged on the production efficiency that its work-ing life directly affects milling train.
During guide plate work, contact and do versus high motion with high temperature rolled piece, high temperature oxidation wearing and tearing and fatigue flake are main failure modes.According to the requirement of China's ferrous metallurgy industry standard " wire rod and rod mill guide device " (YB/T 4172-2008), guide plate should be high temperature resistant, wear-resistant, shock-resistant.In conjunction with actual condition, intaking guide fittings is often furnished with sprinkling system to reduce the temperature on rolled piece surface; During operation, guide plate and rod, wire rod work in water, and supervene the water vapour of a large amount of high temperature, the oxygen of water vapour in air of comparatively high temps is combined, and also can have strong action of rust to guide plate.Therefore, guide plate should have good resistance to high temperature oxidation and corrosive nature, abrasion resistance properties and good toughness to meet shock proof requirement.
In order to the work-ing life of inlet guide, industry and scientific research personnel have carried out a large amount of research work, existing common practice installs the abrasion-proof backing block that can carry out separately changing at the position easy to wear of inlet guide, make maintenance convenient, reduce the replacement frequency of inlet guide, be also conducive to the stability and the reliability that ensure rolled piece operation.Existing abrasion-proof backing block mainly contains two classes: a class adopts forging 40Cr quenched and tempered steel, following (the massfraction of its chemical composition, %): C---0.37 ~ 0.44, Si---0.17 ~ 0.37, Mn---0.50 ~ 0.80, Cr---0.80 ~ 1.10, Ni---≤0.30, P---≤0.035, S---≤0.035, Cu---≤0.030), this kind of abrasion-proof backing block generally has higher shock resistance, but the performance of resistance to high temperature oxidation and wear resistance are all poor; Another kind of employing cold-working grinding tool steel Cr12MoV, following (the massfraction of its chemical composition, %): C---1.45 ~ 1.70, Si---≤0.4, Mn---≤0.5, P---≤0.03, S---≤0.03, Cr---11 ~ 12.5, Mo---0.4 ~ 0.6, V---0.15 ~ 0.30), and quenched and add the heat treatment mode of low-temperaturetempering, this kind of abrasion-proof backing block has the advantages such as higher resistance to high temperature oxidation, wear resistance and dimensional stability, but its toughness is poor, easily produces brittle rupture.Therefore, development of new abrasion-proof backing block becomes the main direction of inlet guide preparation and research field.
The exploitation of novel wear resistant lining board mainly contains both direction: one is use novel material to replace original body material 40Cr or Cr12MoV.Adopt and need in this way comprehensively to transform existing abrasion-proof backing block preparation technology, Financial cost is high, and the production line replacement cycle is long; Another kind is then carry out surface modification to traditional abrasion-proof backing block material 40Cr or Cr12MoV, this method can keep existing abrasion-proof backing block preparation technology constant, only increase surface modification step, the cost compare that need drop into is low, and do not need to change on a large scale existing production line, before therefore comparing, a kind of mode is more suitable for extensive employing.
Flame spray welding is a kind of process for modifying surface developing comparatively maturation, has now been widely used in the surface modification of the various materials comprising the field such as mould, roll, and has brought great economic benefit and social benefit.Flame spray welding technology has that energy-conserving and environment-protective, low cost, efficiency are high, good reliability and the feature such as suitability widely.Utilize flame spray welding technology to material surface surfacing self-fluxing alloyed powder, can form at material surface the coating that one deck has superior deterioration resistance, anticorrosive and resistance to elevated temperatures.This technology is existing a lot of research in other field, as China's publication number be mention in the patent of CN87102001 utilize flame spray welding WC self-fluxing alloyed powder on refractory-material dies surface, greatly can improve the work-ing life of refractory-material dies, and significantly reduce costs, after spray-welding coating wearing and tearing, can also repeated multiple timesly carry out spraying and remelting, its wear resistance with first time surfacing after equal; Also have China's grant number be mention in the patent of CN1313635 titanium alloy surface by flame spray welding Ni base alloy powder formed wear-resistant coating, matrix hardness improves 3 ~ 4 times, wear resistance improves 10 ~ 18 times, and matrix and coating have excellent bonding properties.But up to now, about adopting flame spray welding technology to prepare the research of wear-resistant coating at the surface spraying weld self-fluxing alloyed powder of inlet guide abrasion-proof backing block, there is not been reported.
Summary of the invention
For the deficiencies in the prior art part, the invention provides a kind of preparation method of rolling mill inlet guide abrasion-proof backing block, serious wear during with the guide plate solving conventional mill inlet guide under arms, erosion resistance is poor, impact resistance is poor and the life-span caused is short, replace the problems such as frequent.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
The invention discloses a kind of preparation method of rolling mill inlet guide abrasion-proof backing block, concrete steps are as follows:
1, matrix preparation
Choose the 40Cr steel plate (process redundancy of 2mm is left in bottom surface) of suitable forging specification, after modifier treatment, by surface of steel plate roughing to certain roughness;
2, matrix surface degreasing and activation
The 40Cr steel plate obtained in step 1 is put into alkali lye and clean to remove the grease on surface and slight corrosion, the steel plate cleaned is after air-dry, and adopt blasting craft to carry out roughening treatment to workpiece surface, the surface that purifying treatment is crossed activates more;
3, substrate preheating
By weak for oxy-acetylene flame furnishing carbonizing flame, require P(O
2)>=0.8MPa, P(C
2h
2)>=0.1MPa, 40Cr steel plate step 2 obtained is preheated to suitable temperature ranges, and the pre-protection powder spraying last layer suitable thickness immediately is equably oxidized to prevent surface of steel plate;
4, flame spray welding
A step spray fuse method is taked to carry out flame spray welding to the 40Cr steel plate processed through step 3: to be heated to by steel plate to protect in advance powder to start to soak, when there is " minute surface ", start powder feeding surfacing, powder feeding is operating as intermittent powder feeding; Concrete operations are: be sprayed on by powder after regional area reaches pre-determined thickness equably, melting is heated to the alloy powder layer of same flame to this region, when after appearance " minute surface " reflective phenomenon, again spray gun is slowly moved to another region, and repeat said process, until workpiece surface all covers spray-welding coating reach certain thickness;
5, post-processed
Step 4 is obtained with after the 40Cr steel plate Slow cooling of spray-welding coating, grinding process is carried out to spray-welding coating surface, then surfacing product is finish-machined to according to art work sheet and specifies after specification, namely obtain milling train abrasion-proof backing block;
Preferably, the modifier treatment technique described in step 1 is quenching+high tempering; Wherein quenching temperature scope is 850 DEG C ± 10 DEG C, and the type of cooling is oil cooling; Tempering temperature is 520 DEG C ± 10 DEG C, and the type of cooling can be water-cooled, oil cooling or air cooling.
Preferably, after the surface of steel plate roughing described in step 1, roughness meets Ra=12.5 ~ 6.3 μm.
Preferably, the rough machining method described in step 1 can be sandblasting, mechanical cutting or other method of roughening; Wherein mechanical cutting can be rough turn, plane and milling.
Preferably, the steel plate preheating target temperature described in step 3 is 300 DEG C ~ 400 DEG C.
Preferably; pre-protection powder described in step 3 is nickel base self-fluxing alloy powder; its composition is as follows by mass percentage: C---and 0.6 ~ 0.7%;---14 ~ 15%, Si---2.5 ~ 3.0%, W---5.5 ~ 6.0%, Nb---1.5 ~ 1.8%, Fe---≤5%, Mn---≤0.1%, Mo---≤0.1%, B---1.4 ~ 1.8%, surplus is Ni to Cr.
Preferably, the pre-protection powder layer thickness described in step 3 is 0.1 ~ 0.2mm.
Preferably, the pre-protection powder in the surfacing powder described in step 4 and step 3 is same substance.
Preferably, in step 4, spray-welding coating thickness range is 1 ~ 1.3mm.
The present invention has following technique effect:
The present invention adopts and prepares rolling mill inlet guide abrasion-proof backing block on tradition forging 40Cr hardened and tempered steel plate surface by the method for flame spray welding one deck Co-based alloy powder, and compared with traditional abrasion-proof backing block, abrasion-proof backing block over-all properties of the present invention improves a lot, and contrasts as follows:
The present invention and tradition are forged compared with 40Cr quenched and tempered steel abrasion-proof backing block, there is following superiority: the first, abrasion-proof backing block spray-welding coating of the present invention has the laminate structure be mainly made up of flaky particles, after remelting, spray-welding coating dense structure, be complete metallurgical binding with matrix, matrix and spray-welding coating have excellent bonding properties; Therefore, abrasion-proof backing block of the present invention fully inherits the excellent toughness of body material forging 40Cr quenched and tempered steel, and shock resistance is good; The second, surfacing powder of the present invention is Co-based alloy powder (Ni content >65%), because Ni and Ni alloy has good resistance to elevated temperatures, abrasion-proof backing block of the present invention is had excellent high temperature oxidation resistance that forging 40Cr quenched and tempered steel do not possess and corrosion resistance nature; Three, the Si in spray material is dissolved in the alloy substrate of spray-welding coating and plays solution strengthening effect, improves spray-welding coating intensity; B and Cr in spray material, Ni etc. form hard metal compounds (as Ni
3b
2, Ni
2b, NiB and CrB, Cr
2b, Cr
3b
2deng), W, Nb, Cr etc. in spray material and C element form a large amount of hard carbides, these borides and carbide play dispersion-strengthened action in the alloy, significantly improve hardness and the wear resistance of spray-welding coating, hard carbide WC, NbC also have strong Grain refinement, the intensity of further raising spray-welding coating and toughness---abrasion-proof backing block surface hardness of the present invention high (HRC62 ~ 65), be the nearly twice of tradition forging 40Cr quenched and tempered steel hardness (HRC32 ~ 36), wear resistance improves nearly 6 times (taking wear weight loss as index).
Relative to traditional Cr12MoV steel abrasion-proof backing block, abrasion-proof backing block performance of the present invention is more excellent, shows as: the first, have better toughness, shock resistance is excellent, not easily brittle rupture occurs; The second, abrasion-proof backing block matrix of the present invention is forging 40Cr quenched and tempered steel, hardness lower (HRC32 ~ 36), easily carry out machining, and Cr12MoV abrasion-proof backing block is after quenching adds low-temperature tempering heat treatment, certain distortion can be there is in its hole, silk tooth both hard and crisp be difficult to processing, easily in the course of processing, there is brittle failure and scrap; 3rd, relative to Cr12MoV steel abrasion-proof backing block, the hardness of abrasion-proof backing block of the present invention also improves (HRC62 ~ 65, and Cr12MoV steel abrasion-proof backing block hardness after quenching adds low-temperaturetempering process is HRC50 ~ 60).
To sum up, abrasion-proof backing block of the present invention has excellent toughness and surface hardness is high, high abrasion resistance, thus significantly improves the work-ing life of abrasion-proof backing block, ensure that production efficiency and the product size precision of milling train, reduces production cost; Meanwhile, the flame spray welding procedure that the present invention relates to is simple to operation, and Co-based alloy powder relative price used is moderate, avoids the steel alloy that abrasion-proof backing block entirety adopts high price, significantly reduces production cost further; In addition, according to flame spray welding procedure feature, after spray-welding coating wearing and tearing, can also repeated multiple timesly carry out spraying and remelting, equal with after for the first time surfacing of its wear resistance, it be comparatively easy thus to repair the abrasion-proof backing block of inefficacy.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of preparation method of rolling mill inlet guide abrasion-proof backing block, and serious wear during with the guide plate solving conventional mill inlet guide under arms, erosion resistance is poor, impact resistance is poor and the life-span caused is short, replace the problems such as frequent.
Embodiment 1
To prepare the rolling mill inlet guide abrasion-proof backing block that specification is 210 × 140 × 28 (units: mm), present embodiments provide a kind of preparation method of rolling mill inlet guide abrasion-proof backing block.The method comprises the following steps:
1, matrix preparation
Choose the 40Cr steel plate (process redundancy of 2mm is left in bottom surface) that forging specification is 210 × 140 × 30 (units: mm), after the modifier treatment of quenching+high tempering, by surface of steel plate roughing to roughness Ra=12.5 ~ 6.3 μm.
Wherein quenching temperature scope is 850 DEG C ± 10 DEG C, and the type of cooling is oil cooling; Tempering temperature is 520 DEG C ± 10 DEG C, and the type of cooling can be water-cooled, oil cooling or air cooling.
Wherein, roughing mode is mechanical cutting, comprise rough turn, plane and milling.
2, matrix surface degreasing and activation
The 40Cr steel plate obtained in step 1 is put into alkali lye and clean to remove the grease on surface and slight corrosion, the steel plate cleaned is after air-dry, and adopt blasting craft to carry out roughening treatment to workpiece surface, the surface that purifying treatment is crossed activates more.
3, preheating
By weak for oxy-acetylene flame furnishing carbonizing flame, require P(O
2)>=0.8MPa, P(C
2h
2)>=0.1MPa, 40Cr steel plate step 2 obtained is preheated to 400 DEG C, and the pre-protection powder that the upper 0.2mm of spraying is thick equably is immediately oxidized to prevent surface of steel plate.
Wherein, pre-protection powder is nickel base self-fluxing alloy powder, and its composition is as follows by mass percentage: C ~ 0.7%, Cr ~ 14%, Si ~ 2.5%, W ~ 6.0%, Nb ~ 1.8%, Fe ~ 4.5%, Mn ~ 0.05%, Mo ~ 0.05%, B1.6%, and surplus is Ni.
The moisture of 40Cr surface of steel plate can be removed by preheating, improve the bonding strength for the treatment of spray-welding coating and matrix steel plate and reduce stress and avoid bisque to occur the phenomenon ftractureing and shell.
When steel plate is preheated to 400 DEG C, workpiece surface is light blue, in this, as tentatively judging whether temperature reach the required standards, should finally use land surface pyrometer measuring tempeature.
4, surfacing
A step spray fuse method is taked to carry out flame spray welding to the 40Cr steel plate processed through step 3: to be heated to by steel plate to protect in advance powder to start to soak, when there is " minute surface ", start powder feeding surfacing, powder feeding is operating as intermittent powder feeding; Concrete operations are: be sprayed on by powder after regional area reaches pre-determined thickness equably, melting is heated to the alloy powder layer of same flame to this region, when after appearance " minute surface " reflective phenomenon, again spray gun is slowly moved to another region, and repeat said process, until workpiece surface all covers spray-welding coating reach 1.3mm.
Wherein, surfacing bisque is and the nickel base self-fluxing alloy powder protecting powder identical component in advance.The Partial Elements of spray-welding coating powdered alloy of the present invention is described in detail as follows: Ni and Ni base alloy is excellent high temperature material, and under high temperature, chemical stability is good, resistance to high temperature oxidation and corrosive nature good; Cr element can solution strengthening matrix, improves the hardening capacity of steel, wear resistance and erosion resistance, while raising hardness and intensity, do not reduce impact toughness; Si element is dissolved in the alloy substrate of surfacing, causes lattice distortion, and lattice distortion increases the resistance of dislocation motion, makes slippage be difficult to carry out, thus the intensity of Alloy solid solution and hardness are increased, and improves spray-welding coating intensity and hardness; B element and Cr, Ni etc. form the hard compounds particle of Dispersed precipitate (as Ni
3b
2, Ni
2b, NiB and CrB, Cr
2b, Cr
3b
2deng), the ultrafine particulate of disperse hinders the motion of dislocation, both can significantly improve alloy strength and hardness, plasticity and toughness can be made again to decline little; W, Nb, Cr etc. in spray material and C element form a large amount of hard carbides, and these carbide play dispersion-strengthened action in the alloy, significantly improve hardness and the wear resistance of spray-welding coating; Hard carbide WC, NbC also have strong Grain refinement, can improve yield strength and the hardness of material simultaneously, thus promote alloy rigidity and toughness simultaneously.
5, post-processed
Step 4 is obtained with after the 40Cr steel plate Slow cooling of spray-welding coating, grinding process is carried out to spray-welding coating surface, then surfacing product is finish-machined to 210 × 140 × 28 (units: mm) according to art work sheet, namely obtains milling train abrasion-proof backing block.
Embodiment 2
The present embodiment provides a kind of abrasion-proof backing block, comprise matrix and the wearing layer of flame spray welding method surfacing on matrix of forging 40Cr quenched and tempered steel, wherein wearing layer composition is as follows by mass percentage: C ~ 0.6%, Cr ~ 15%, Si ~ 3%, W ~ 5.5%, Nb ~ 1.5%, Fe ~ 4%, Mn ~ 0.1%, Mo ~ 0.1%, B1.5%, surplus is Ni.
Embodiment 3
Mechanics Performance Testing is carried out to forging 40Cr quenched and tempered steel (860 DEG C of quenching oil coolings+520 DEG C of tempering oil coolings) abrasion-proof backing block, equally Cr12MoV steel (quenching+low-temperature tempering heat treatment) abrasion-proof backing block of specification of the abrasion-proof backing block in embodiment 1,2 and same specification---comprise surface hardness test, wear test and impelling strength experiment (the U-shaped sample of standard measures at 20 DEG C).Experimental result is as shown in table 1 below:
The mechanical experimental results of table 1 embodiment and comparative example
Can be found out by mechanical experimental results, abrasion-proof backing block of the present invention is compared with traditional abrasion-proof backing block, and comprehensive mechanical property improves a lot, and not only has excellent toughness and surface hardness is high, high abrasion resistance.
As can be seen from the table, the present invention and tradition are forged compared with 40Cr quenched and tempered steel abrasion-proof backing block, have following superiority: the first, abrasion-proof backing block of the present invention fully inherits the excellent toughness of body material forging 40Cr quenched and tempered steel, and shock resistance is good; The second, abrasion-proof backing block surface hardness of the present invention high (HRC64 ~ 65) is the nearly twice of tradition forging 40Cr quenched and tempered steel hardness (HRC34); 3rd, abrasion-proof backing block wear resistance of the present invention improves nearly 6 times (taking wear weight loss as index).
Relative to traditional Cr12MoV steel abrasion-proof backing block, abrasion-proof backing block performance of the present invention is more excellent, shows as: the first, have better impelling strength, shock resistance is excellent, not easily brittle rupture occurs; The second, relative to Cr12MoV steel abrasion-proof backing block, the hardness of abrasion-proof backing block of the present invention also improves (HRC64 ~ 65, and Cr12MoV steel abrasion-proof backing block hardness after quenching adds low-temperaturetempering process is HRC60).
Be described in detail the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block provided by the present invention above, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a preparation method for rolling mill inlet guide abrasion-proof backing block, is characterized in that, comprises the steps:
Prepared by step one, matrix
Choose the 40Cr steel plate (process redundancy of 2mm is left in bottom surface) of suitable forging specification, after modifier treatment, by surface of steel plate roughing to certain roughness;
Step 2, matrix surface degreasing and activation
The 40Cr steel plate obtained in step one is put into alkali lye and clean to remove the grease on surface and slight corrosion, the steel plate cleaned is after air-dry, and adopt blasting craft to carry out roughening treatment to workpiece surface, the surface that purifying treatment is crossed activates more;
Step 3, substrate preheating
By weak for oxy-acetylene flame furnishing carbonizing flame, require P (O
2)>=0.8MPa, P (C
2h
2)>=0.1MPa, 40Cr steel plate step 2 obtained is preheated to suitable temperature ranges, and the pre-protection powder spraying last layer suitable thickness immediately is equably oxidized to prevent surface of steel plate;
Step 4, flame spray welding
A step spray fuse method is taked to carry out flame spray welding to the 40Cr steel plate through step 3 process: to be heated to by steel plate to protect in advance powder to start to soak, when there is " minute surface ", start powder feeding surfacing, powder feeding is operating as intermittent powder feeding; Concrete operations are: be sprayed on by powder after regional area reaches pre-determined thickness equably, melting is heated to the alloy powder layer of same flame to this region, when after appearance " minute surface " reflective phenomenon, again spray gun is slowly moved to another region, and repeat said process, until workpiece surface all covers spray-welding coating reach certain thickness;
Step 5, post-processed
Step 4 is obtained with after the 40Cr steel plate Slow cooling of spray-welding coating, grinding process is carried out to spray-welding coating surface, then surfacing product is finish-machined to according to art work sheet and specifies after specification, namely obtain milling train abrasion-proof backing block.
2. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1, is characterized in that: the modifier treatment technique described in step one is quenching+high tempering; Wherein quenching temperature scope is 850 DEG C ± 10 DEG C, and the type of cooling is oil cooling; Tempering temperature is 520 DEG C ± 10 DEG C, and the type of cooling can be water-cooled, oil cooling or air cooling.
3. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1, is characterized in that: after the surface of steel plate roughing described in step one, roughness meets Ra=12.5 ~ 6.3 μm.
4. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1, is characterized in that: the rough machining method described in step one can be sandblasting, mechanical cutting or other method of roughening; Wherein mechanical cutting can be rough turn, plane and milling.
5. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1, is characterized in that: the 40Cr steel plate preheating temperature described in step 3 is 300 DEG C ~ 400 DEG C.
6. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1; it is characterized in that: the pre-protection powder described in step 3 is nickel base self-fluxing alloy powder; it is as follows that its composition presses percent mass hundred: C---and 0.6 ~ 0.7%;---14 ~ 15%, Si---2.5 ~ 3.0%, W---5.5 ~ 6.0%, Nb---1.5 ~ 1.8%, Fe---≤5%, Mn---≤0.1%, Mo---≤0.1%, B---1.4 ~ 1.8%, surplus is Ni to Cr.
7. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1, is characterized in that: the pre-protection powder layer thickness described in step 3 is 0.1 ~ 0.2mm.
8. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1, is characterized in that: the pre-protection powder in the surfacing powder described in step 4 and step 3 is same substance.
9. the preparation method of a kind of rolling mill inlet guide abrasion-proof backing block according to claim 1, is characterized in that: in step 4, spray-welding coating thickness range is 1 ~ 1.3mm.
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| CN106222653A (en) * | 2016-08-19 | 2016-12-14 | 合肥东方节能科技股份有限公司 | A kind of preparation method of the rolling mill guiding liner plate of high-wearing feature |
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| CN108624798A (en) * | 2018-05-14 | 2018-10-09 | 合肥东方节能科技股份有限公司 | A kind of rolling mill guiding liner plate of high-wearing feature |
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