CN102896458A - Surface treatment method for loop back rolls of hot continuous rolling units - Google Patents
Surface treatment method for loop back rolls of hot continuous rolling units Download PDFInfo
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- CN102896458A CN102896458A CN2011102105381A CN201110210538A CN102896458A CN 102896458 A CN102896458 A CN 102896458A CN 2011102105381 A CN2011102105381 A CN 2011102105381A CN 201110210538 A CN201110210538 A CN 201110210538A CN 102896458 A CN102896458 A CN 102896458A
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Abstract
The invention discloses a surface treatment method for loop back rolls of hot continuous rolling units, and the method comprises the following steps of: firstly, carrying out cleaning pretreatment on the surface of a loop back roll, and carrying out overlay welding on the surface of the loop back roll by using a hard-surface alloy welding wire so as to form a middle transition layer with the thickness of 2-3 mm, wherein the overlay welding current is 380-450A, the voltage is 26-30V, and the overlay welding speed is 300-400 mm/min; then, preparing a work coating with the thickness of 0.5-2 mm by using a spray welding remelting way, wherein the work coating is made of a Ni-based alloy powder material, the distance between a spray gun and the surface of a workpiece is 250 mm, the powder feeding speed is 50-150 g/min, and the gas pressures of acetylene and oxygen are respectively 0.1-0.3 MPa and0.1-0.5 MPa; and finally, carrying out remelting treatment on the work coating by using an oxyacetylene flame gun, wherein the flow rates of acetylene and oxygen are respectively 1 kg/cm<3> and 4.5 kg/cm<3>, and the remelting temperature is 800-1200 DEG C. The method disclosed by the invention can be used for improving the wear resistance and corrosion resistance of the surfaces of loop back rolls, prolonging the service lives of the loop back rolls, ensuring the normal operation of hot continuous rolling units, and improving the quality and production efficiency of strip steel rolling.
Description
Technical field
The present invention relates to a kind of hot continuous rolling unit loop back roll surface treatment method.
Background technology
In the hot strip rolling process, the mechanical performance of hot-rolled product is mainly determined by the finish rolling operation.Along with the variation that the hot-rolled product mechanical performance is required, high layering is also more and more higher to the requirement of finish rolling.Most employing 6 frames or 7 frames are rolling in the at present finish rolling, and loop back roll is to formation and stable the playing an important role of continuous rolling relationship.During Hot Strip Rolling, the band steel differs in the rolling rear speed of front and back rolling machine frame, the band steel produces a cornerite at loop back roll, tension force with steel makes loop back roll be subject to certain radial load, load cell on the loop back roll bearing block is converted to the signal of telecommunication with pressure, enter rolling tension control system, rely on the rise of loop back roll and be close to the band steel, regulate strip speed, cover amount so that elimination produces when next frame is nipped with steel head changes the cornerite with steel and loop back roll, with absorption band steel tensile wave momentum, to applying certain tension force with steel between frame, to realize the stable of as-rolled condition between frame.
Loop back roll is in said process, and under the highest about 800 ℃ of conditions of high temperature, the impact, friction and the profit that constantly are subject to steel mix the corrosion comprehensive function of cooling fluid in spray or the steam atomization.General loop back roll surface adopts the built-up welding of 2Cr13 material to process, and its surface is vulnerable to the corrosion of operation of rolling cooling fluid, and roll surface forms rust staining, and because the characteristic that built-up welding is processed, particularly between roll surface welding bead overlap joint, produce easily corrosion, and anti-wear performance is relatively relatively poor.If the roll surface rust staining comes off, in the follow-up operation of rolling, be pressed into the band steel, affect strip quality.And loop back roll with friction process with steel in, wear out failure forms the striated polishing scratch easily, impact is with the quality of steel.If the loop back roll wearing and tearing are uneven, it is one large one small to form roll surface, also will have influence on follow-up rolling rear plate shape with steel.After loop back roll uses a period of time, for continuing to use, having to that generally the loop back roll roll surface is carried out reconditioning processes, this has not only affected the production efficiency of the normal operation of hot continuous rolling unit and belt steel rolling, also reduce the service life of loop back roll, and can't improve the wear-resistant corrosion resistant performance of loop back roll roll surface at all.
Summary of the invention
Technical problem to be solved by this invention provides a kind of hot continuous rolling unit loop back roll surface treatment method, the wear-resistant corrosion resistant performance of loop back roll roll surface that utilized this method Effective Raise, prolonged the service life of loop back roll, guarantee the normal operation of hot continuous rolling unit, improved quality and the production efficiency of belt steel rolling.
For solving the problems of the technologies described above, hot continuous rolling unit loop back roll surface treatment method of the present invention comprises the steps:
Step 1, preliminary treatment is carried out on the loop back roll surface, adopted organic solvent cleaning, alkali degreasing, electrolytic degreasing, acid etch and activation process;
Step 2, adopt the built-up welding mode to prepare intermediate layer to loop back roll surface, the resurfacing welding material that uses is the hard facing alloy welding wire, the hard facing alloy wire composition is that 0.1-0.25%C, 10-15%Cr, 1.8%Mn, 1.0%W, 1.0%Mo, surplus are Fe, the composition of hard facing alloy welding wire is percentage by weight, welding current is 380-450A, built-up welding voltage 26-30V, built-up welding speed is 300-400mm/min, the middle transition layer thickness is 2-3mm;
Step 3, surfacing remelting mode preparation work coating is adopted on loop back roll surface, adopt flame spray powder coating equipment to loop back roll surface spraying Ni base alloy powder material, Ni base alloy powder material composition is that 0.5-1.0%C, 10-20%Cr, 4-15%Fe, 3-4%B, 4-5%Si, surplus are Ni, the composition of Ni base alloy powder material is percentage by weight, spray gun and surface of the work distance are 250mm, powder feed rate is 50-150g/min, acetylene gas pressure is 0.1-0.3MPa, oxygen gas pressure is 0.1-0.5MPa, and the work coating layer thickness is 0.5-2mm;
Step 4, employing oxyacetylene torch rifle carry out remelting to loop back roll surface work coating to be processed, and the acetylene flow is 1kg/cm3, and oxygen flow is 4.5kg/cm3, and remelting temperature is controlled at 800-1200 ℃.
Because hot continuous rolling unit loop back roll surface treatment method of the present invention has adopted technique scheme, namely at first adopt organic solvent cleaning, alkali degreasing, electrolytic degreasing, acid etch and activation process that preliminary treatment is carried out on the loop back roll surface, then adopt the hard facing alloy welding wire to utilize the built-up welding mode to prepare thickness to the loop back roll surface and be the intermediate layer of 2-3mm, welding current 380-450A, voltage 26-30V, built-up welding speed 300-400mm/min, intermediate layer; Adopting surfacing remelting mode to prepare thickness is 0.5-2mm work coating again, the work coating is Ni base alloy powder material, spray gun is apart from surface of the work 250mm, powder feed rate 50-150g/min, and the gas pressure of acetylene and oxygen is respectively 0.1-0.3MPa and 0.1-0.5MPa; Adopt the oxyacetylene torch rifle that the work coating is carried out remelting and process, the flow of acetylene and oxygen is respectively 1kg/cm3 and 4.5kg/cm3, and remelting temperature is controlled at 800-1200 ℃.This method Effective Raise the wear-resistant corrosion resistant performance of loop back roll roll surface, prolonged service life of loop back roll, guaranteed the normal operation of hot continuous rolling unit, improved quality and the production efficiency of belt steel rolling.
The specific embodiment
Hot continuous rolling unit loop back roll surface treatment method of the present invention comprises the steps:
Step 1, preliminary treatment is carried out on the loop back roll surface, adopted organic solvent cleaning, alkali degreasing, electrolytic degreasing, acid etch and activation process;
Step 2, adopt the built-up welding mode to prepare intermediate layer to loop back roll surface, the resurfacing welding material that uses is the hard facing alloy welding wire, the hard facing alloy wire composition is that 0.1-0.25%C, 10-15%Cr, 1.8%Mn, 1.0%W, 1.0%Mo, surplus are Fe, the composition of hard facing alloy welding wire is percentage by weight, welding current is 380-450A, built-up welding voltage 26-30V, built-up welding speed is 300-400mm/min, the middle transition layer thickness is 2-3mm;
Step 3, surfacing remelting mode preparation work coating is adopted on loop back roll surface, adopt flame spray powder coating equipment to loop back roll surface spraying Ni base alloy powder material, Ni base alloy powder material composition is that 0.5-1.0%C, 10-20%Cr, 4-15%Fe, 3-4%B, 4-5%Si, surplus are Ni, the composition of Ni base alloy powder material is percentage by weight, spray gun and surface of the work distance are 250mm, powder feed rate is 50-150g/min, acetylene gas pressure is 0.1-0.3MPa, oxygen gas pressure is 0.1-0.5MPa, and the work coating layer thickness is 0.5-2mm;
Step 4, employing oxyacetylene torch rifle carry out remelting to loop back roll surface work coating to be processed, and the acetylene flow is 1kg/cm3, and oxygen flow is 4.5kg/cm3, and remelting temperature is controlled at 800-1200 ℃.
This method mainly be at the intermediate layer surface spraying weld of loop back roll surface overlaying the layer of Ni base alloy material, the intermediate layer of built-up welding and loop back roll material main body have stronger adhesion, Ni alloy-based material is with respect to the 2Cr13 material on traditional loop back roll surface, its decay resistance is better, therefore, loop back roll in use mixes under the corrosiveness of cooling fluid in spray or the steam atomization at profit, and the loop back roll surface has good decay resistance.Particularly added an amount of Cr, Fe element in Ni alloy-based material, formed NiCr solid solution and other hard phase, further improved its anti-wear performance, decay resistance also effectively improves simultaneously.In the Ni base alloy material, add simultaneously certain B, Si element, make the work coating in the surfacing reflow process, the self-fluxing nature feature of alloy is provided, melting is floated with other metal oxide formation pyrex in the surfacing reflow process for B, Si, effectively reduce oxide and pore in the work coating, and the melting of boron oxide and removal, help the wetting and combination of alloy, thereby work coating oxidation thing is low, pore is few, has improved the performance of work coating.Adopt the work coating of surfacing remelting method preparation, relatively traditional loop back roll surface overlaying 2Cr13 coating, its work coating is comparatively even, uneven without the performances such as hardness that bead welding difference causes, and Ni base alloy material hardness under the condition of high temperature is relatively high, corrosion-resistant, wear resistance is better, thereby improved the service life of loop back roll.
Coating sample and tradition by this method preparation adopt the sample of 2Cr13 material built-up welding to compare experiment, carry out respectively hardness test, thermal shock performance test, hardness test after the thermal shock, immersion corrosion test.Hardness test is to carry out the test of cross section Vickers hardness after the metallographic sampling, and hardness test 200g load continues 5s, gets 5 mean values.Generally speaking, under other condition same condition, its anti-wear performance of material that hardness is high is relatively better.The thermal shock performance test is heated to sample 800 ℃ of temperature and makes it whole soaking, then takes out hardening and is cooled to room temperature, repeats this program, in order to assess the anti-strip ability of coating.Wherein, the opposing of high thermal shock number of times explanation coating for surface protection is strong because of not mating the ability that causes stress crack or peel off, and hangs down the thermal shock number of times and reflects that then the easy generation of coating for surface protection do not mate stress crack or peel off.After the thermal shock hardness test be thermal shock 15 times afterwards sampling carry out the test of cross section Vickers hardness.The immersion corrosion test is immersed in sample in the saturated NaCl solution simultaneously, relatively the decay resistance of two kinds of samples.The expression poor corrosion resistance that erosion occurs at first.The result of the test of sample sees the following form:
| Sequence number | Case | Hardness before the thermal shock | Hardness after the thermal shock | Thermal shock performance | Decay resistance |
| 1 | This method sample | 596 | 558 | √ | √ |
| 2 | The tradition sample | 512 | 347 | √ | × |
As can be seen from the table, the coating microhardness that this method prepares sample hardness behind the traditional sample, particularly thermal shock is still higher, corrosion resistance and good, and after traditional sample thermal shock hardness descend very fast, poor corrosion resistance.And coating and the roller of this method preparation have good associativity, through disbonding still not occurring after more than ten times the thermal shock resistance test.
This method not only can prepare the loop back roll face coat in enormous quantities, also can be applied to the laminar flow chill roll of similar operating mode, helps winding up roller or other surface of roller.Simultaneously, this method technological operation is very easy with production, process controllability is very good.
Claims (1)
1. a hot continuous rolling unit loop back roll surface treatment method is characterized in that this method comprises the steps:
Step 1, preliminary treatment is carried out on the loop back roll surface, adopted organic solvent cleaning, alkali degreasing, electrolytic degreasing, acid etch and activation process;
Step 2, adopt the built-up welding mode to prepare intermediate layer to loop back roll surface, the resurfacing welding material that uses is the hard facing alloy welding wire, the hard facing alloy wire composition is that 0.1-0.25%C, 10-15%Cr, 1.8%Mn, 1.0%W, 1.0%Mo, surplus are Fe, the composition of hard facing alloy welding wire is percentage by weight, welding current is 380-450A, built-up welding voltage 26-30V, built-up welding speed is 300-400mm/min, the middle transition layer thickness is 2-3mm;
Step 3, surfacing remelting mode preparation work coating is adopted on loop back roll surface, adopt flame spray powder coating equipment to loop back roll surface spraying Ni base alloy powder material, Ni base alloy powder material composition is that 0.5-1.0%C, 10-20%Cr, 4-15%Fe, 3-4%B, 4-5%Si, surplus are Ni, the composition of Ni base alloy powder material is percentage by weight, spray gun and surface of the work distance are 250mm, powder feed rate is 50-150g/min, acetylene gas pressure is 0.1-0.3MPa, oxygen gas pressure is 0.1-0.5MPa, and the work coating layer thickness is 0.5-2mm;
Step 4, employing oxyacetylene torch rifle carry out remelting to loop back roll surface work coating to be processed, and the acetylene flow is 1kg/cm3, and oxygen flow is 4.5kg/cm3, and remelting temperature is controlled at 800-1200 ℃.
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| CN104651773A (en) * | 2015-03-17 | 2015-05-27 | 郴州市泰益表面涂层技术有限公司 | Roller repairing layer and method for repairing roller by utilizing roller repairing layer |
| CN104668914A (en) * | 2015-03-19 | 2015-06-03 | 柳州市永益机械制造有限公司 | Manufacturing method of rolling mill frame |
| CN104726627A (en) * | 2013-12-18 | 2015-06-24 | 上海宝钢工业技术服务有限公司 | Method for manufacturing blooming furnace burden high temperature swing-type distribution chute |
| CN105648385A (en) * | 2016-01-15 | 2016-06-08 | 张家港清研再制造产业研究院有限公司 | Cylinder block hole high-velocity oxygen-fuel sprayed ion-based coating and manufacturing method thereof |
| CN107378287A (en) * | 2017-06-23 | 2017-11-24 | 江阴中绿冶金设备有限公司 | The method that built-up welding remelting is combined repair welding roller surface defect |
| CN107378286A (en) * | 2017-06-23 | 2017-11-24 | 江阴中绿冶金设备有限公司 | The preparation method for the composite hard layer that roller surface built-up welding remelting is combined |
| CN113088862A (en) * | 2021-03-30 | 2021-07-09 | 安徽马钢表面技术股份有限公司 | Wear-resistant coating for loop roller between plate and strip hot rolling line finishing mills and preparation method thereof |
| CN113913722A (en) * | 2021-09-23 | 2022-01-11 | 泰尔(安徽)工业科技服务有限公司 | Surface composite coating of mandrel for rolling seamless steel tube and preparation method thereof |
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| CN104726627A (en) * | 2013-12-18 | 2015-06-24 | 上海宝钢工业技术服务有限公司 | Method for manufacturing blooming furnace burden high temperature swing-type distribution chute |
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| CN107378287A (en) * | 2017-06-23 | 2017-11-24 | 江阴中绿冶金设备有限公司 | The method that built-up welding remelting is combined repair welding roller surface defect |
| CN107378286A (en) * | 2017-06-23 | 2017-11-24 | 江阴中绿冶金设备有限公司 | The preparation method for the composite hard layer that roller surface built-up welding remelting is combined |
| CN113088862A (en) * | 2021-03-30 | 2021-07-09 | 安徽马钢表面技术股份有限公司 | Wear-resistant coating for loop roller between plate and strip hot rolling line finishing mills and preparation method thereof |
| CN113088862B (en) * | 2021-03-30 | 2023-04-07 | 安徽马钢表面技术股份有限公司 | Wear-resistant coating for loop roller between plate and strip hot rolling line finishing mills and preparation method thereof |
| CN113913722A (en) * | 2021-09-23 | 2022-01-11 | 泰尔(安徽)工业科技服务有限公司 | Surface composite coating of mandrel for rolling seamless steel tube and preparation method thereof |
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Application publication date: 20130130 |