CN103834896A - Continuous casting crystallizer long-side copper plate coating thermal spraying method - Google Patents
Continuous casting crystallizer long-side copper plate coating thermal spraying method Download PDFInfo
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- CN103834896A CN103834896A CN201210474899.1A CN201210474899A CN103834896A CN 103834896 A CN103834896 A CN 103834896A CN 201210474899 A CN201210474899 A CN 201210474899A CN 103834896 A CN103834896 A CN 103834896A
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Abstract
The invention discloses a continuous casting crystallizer long-side copper plate coating thermal spraying method. The continuous casting crystallizer long-side copper plate coating thermal spraying method comprises following steps: firstly, the surface of a long-side copper plate is processed to be a surface for spraying, and obtain an arc-shaped structure with two higher sides and a lower middle part, wherein height difference of the higher sides and the lower middle part ranges from 1 to 10cm, and a circular arc transition manner is adopted; the surface for spraying is subjected to oil removing, cleaning, and activation processing, and then is subjected to sand blasting, wherein roughness is controlled to be Ra4-10; the long-side copper plate surface for spraying is subjected to Ni-based coating thermal spraying using high velocity oxygen fuel, wherein thickness of obtained coating ranges from 0.1 to 2.5cm; and at last, the long-side copper plate is subjected to heat treatment, wherein a temperature is maintained to be 800-1100 DEG C for 60min, and heating rate and cooling rate are both less than 30 DEG C/h. The continuous casting crystallizer long-side copper plate coating thermal spraying method is capable of preparing continuous casting crystallizer long-side copper plate coating conveniently; binding strength of the obtained continuous casting crystallizer long-side copper plate coating with a copper plate substrate is high; copper plate deformation is small; high-temperature corrosion wear resistance is high; and service life of the continuous casting crystallizer long-side copper plate is prolonged.
Description
Technical field
The present invention relates to the long limit of a kind of continuous cast mold copper coin coating hot-spraying method.
Background technology
Continuous cast mold is called as continuous casting installation for casting " heart ", directly affects the indexs such as strand quality, continuous caster pulling rate and production efficiency.Crystallizer is by growing limit copper coin and minor face copper coin forms, and copper coin stands high temperature liquid iron for a long time and washes away, and very easily occurs the damage types such as thermal crack, wearing and tearing, corrosion; And the damage of copper coin surface local often causes whole component failure, therefore copper plate of crystallizer is the second largest metallurgical consumptive material after roll.The copper plate electroplating technology of widespread use at present, as early stage plating Cr, electroplated Ni-Cr, at present common electroplated Ni-Fe, electroplated Ni-Co, plating Co-Ni etc., although can improve copper coin work-ing life, but degree is limited, far away from thering is the more New Hot Spraying Technique of high-wearing feature and heat and corrosion resisting.
At present, hot-spraying techniques development rapidly, has been carried out successful Application at the multiple key parts of steel industry, as sinking roller, stabilizing roller, furnace roller etc.On Baosteel continuous cast mold minor face copper coin, also have the application of hot spray coating, and effect is better, the life-span has been improved 4-5 doubly compared with galvanization coating.But current rare hot-spraying techniques is at the application case of the long limit of continuous cast mold copper coin.This is that the coating of preparing due to hot-spraying techniques is relative with matrix associativity poor, generally carry out subsequent disposal by heat treated mode, but always there is in actual applications certain defect, as copper coin produces irregular or moderate finite deformation, the work-ing life of whole continuous cast mold and the normal operation of continuous casting installation for casting are had a strong impact on.
Summary of the invention
Technical problem to be solved by this invention is to provide the long limit of a kind of continuous cast mold copper coin coating hot-spraying method, utilize present method can conveniently prepare the long limit of continuous cast mold copper coin coating, the coating making and copper coin material main body bonding strength are high, and copper plate distortion is less, there is good high temperature corrosion and wear resistance effect, improve the work-ing life of the long limit of continuous cast mold copper coin.
For solving the problems of the technologies described above, the long limit of continuous cast mold of the present invention copper coin coating hot-spraying method comprises the steps:
Step 1, by the copper coin machining surface processing of long continuous cast mold limit, remove original coating or fatigue layer, be processed into surface to be sprayed;
Step 2, long limit, edge copper coin length direction are progressively corrected, and high, the middle low circular shape in both sides is corrected on copper coin surface to be sprayed, the longest limit, and long limit copper coin limit portion's vertex and middle part lower-most point differ 1-10cm, and arc transition;
Step 3, adopt acetone to carry out oil removal treatment to long limit copper coin surface to be sprayed, adopt organic solvent, alkali lye, acetone, alcohol, weak acid or electrolysis mode cleans and activation treatment;
Step 4, sandblasting is carried out in copper coin surface to be sprayed, long limit, sandblasting rear surface roughness is controlled at Ra4-10;
Step 5, employing supersonic flame carry out thermal spraying treatment to copper coin surface to be sprayed, long limit, and spray material is Ni base coating, and coating is with copper coin surface topography, and coat-thickness is 0.1-2.5mm;
Step 6, long limit copper coin is heat-treated, thermal treatment holding temperature is 800-1100 DEG C, and soaking time is 60min, in heat treatment process, and temperature rise rate and 30 DEG C/h of rate of temperature fall <.
Further, above-mentioned Ni base coating component is C content≤0.25w%, Cr content≤15w%, W content≤20w%, B content≤4w%, Si content≤5w%, Mo content 5.0w%, and surplus is Ni.
Further, the parameter of above-mentioned hypersonic flame spraying is that oxygen flow is that 900-1200 SLPM, kerosene oil flow are that 3-5L/h, powder feeding rate are that 75-150g/min, rifle are apart from being 20-50cm.
Because the long limit of continuous cast mold of the present invention copper coin coating hot-spraying method has adopted technique scheme, first will grow limit copper coin surface working and become surface to be sprayed; And correct into high, the middle low circular shape in both sides, it differs 1-10cm, and arc transition; Treat sprayed surface and carry out oil removing, cleaning and activation treatment; Treat again sprayed surface and carry out sandblasting, and to control roughness be Ra4-10; Adopt supersonic flame to carry out the processing of Ni base coating hot-spraying to copper coin surface to be sprayed, long limit, coat-thickness is 0.1-2.5mm; Finally long limit copper coin is heat-treated, holding temperature is 800-1100 DEG C, and soaking time is 60min, temperature rise rate and 30 DEG C/h of rate of temperature fall <.Present method can conveniently be prepared the long limit of continuous cast mold copper coin coating, and the coating making and copper coin material main body bonding strength are high, and copper plate distortion is less, have good high temperature corrosion and wear resistance effect, improves the work-ing life of the long limit of continuous cast mold copper coin.
Embodiment
The long limit of continuous cast mold of the present invention copper coin coating hot-spraying method comprises the steps:
Step 1, by the copper coin machining surface processing of long continuous cast mold limit, remove original coating or fatigue layer, be processed into surface to be sprayed;
Step 2, long limit, edge copper coin length direction are progressively corrected, and high, the middle low circular shape in both sides is corrected on copper coin surface to be sprayed, the longest limit, and long limit copper coin limit portion's vertex and middle part lower-most point differ 1-10cm, and arc transition;
Step 3, adopt acetone to carry out oil removal treatment to long limit copper coin surface to be sprayed, adopt organic solvent, alkali lye, acetone, alcohol, weak acid or electrolysis mode cleans and activation treatment;
Step 4, sandblasting is carried out in copper coin surface to be sprayed, long limit, sandblasting rear surface roughness is controlled at Ra4-10;
Step 5, employing supersonic flame carry out thermal spraying treatment to copper coin surface to be sprayed, long limit, and spray material is Ni base coating, and coating is with copper coin surface topography, and coat-thickness is 0.1-2.5mm;
Step 6, long limit copper coin is heat-treated, thermal treatment holding temperature is 800-1100 DEG C, and soaking time is 60min, in heat treatment process, and temperature rise rate and 30 DEG C/h of rate of temperature fall <.
Further, above-mentioned Ni base coating component is C content≤0.25w%, Cr content≤15w%, W content≤20w%, B content≤4w%, Si content≤5w%, Mo content 5.0w%, and surplus is Ni.
Further, the parameter of above-mentioned hypersonic flame spraying is that oxygen flow is that 900-1200 SLPM, kerosene oil flow are that 3-5L/h, powder feeding rate are that 75-150g/min, rifle are apart from being 20-50cm.
First present method has selected the spray material of Ni base alloying constituent from material, the Cr of the certain content containing in coating and W, and part forms sosoloid with Ni, and hard phase in coating is increased, and makes coating have good room temperature and wear resistance at elevated temperature.The B of the certain content in coating, Si element, make coating in heat treated process, the self-fluxing nature feature of alloy is provided, B, Si form with other metal oxide and form pyrex and melting floating in heat treatment process, reduce oxide compound and pore in coating, and, the melting of boron oxide and removal, contribute to the wetting and combination of alloy, thereby coating oxidation thing is low, pore is few, coating is evenly fine and close.Therefore, coating has good wear-resisting, heat-resisting, antifatigue, corrosion resisting property.
The thermal treatment temp that present method coating material is carried out and copper coin basic material (being generally Cr-Zr-Cu alloy) thermal treatment temp matches, in the process of heat-treating, not only improve the bonding strength of coating and matrix, and do not affected the performance of copper coin basic material.And, due to the correction process of carrying out before spraying, form shape curved on copper coin, make like this stress forming in spraying process, and heat treatment process floating coat and the inconsistent stress causing of basic material thermal expansivity, these two kinds of stress just make curved alteration of form on copper coin, and straighten or slightly descend curved, thereby ensured the bonding properties that coating and copper coin matrix are good, and long limit copper coin is unlikely to produce and cannot normally uses compared with large distortion.Present method technological operation is very easy with production simultaneously, process controllability is very good, has effectively improved coating quality and efficiency.
Coupons is become to sliver by the long limit of continuous cast mold copper coin scaled down, adopt present method to prepare coating and obtain standard test specimen; Comparison sample 1, duplicate 1 is made by present method, but removes step 2; Comparison sample 2, duplicate 2 is made by present method, but spray material replaces to Cr3C2-25 NiCr material; Comparison sample 3, duplicate 3 is made by traditional plating mode, and electroplates Co-Ni coating.Above-mentioned four kinds of samples are carried out to contrast experiment, carry out respectively the test of cross section coating microhardness, the test of coating deformation rate and metallurgical states test, obtain following table:
| Sequence number | Case | Coating hardness | Deformation rate | Metallurgical states |
| 1 | Standard test specimen | 726 | 0.021% | Homogeneous microstructure, densification, forms metallurgical binding with matrix |
| 2 | Duplicate 1 | 708 | 2.018% | Homogeneous microstructure, densification, forms metallurgical binding with matrix |
| 3 | Duplicate 2 | 512 | 0.981% | Part undergoes phase transition, and forms metallurgical binding with matrix |
| 4 | Duplicate 3 | 257 | 0.016% | Homogeneous microstructure, densification, forms metallurgical binding with matrix |
As can be seen from the table, standard test specimen microhardness is apparently higher than duplicate 3, and also higher than duplicate 2, in general, hardness is higher, and coating wear resistance is better.Duplicate 2 undergoes phase transition in heat treatment process, thereby causes coating hardness lower.The comparison of special standard test specimen and duplicate 1, owing to not adopting the step 2 of present method, the deformation rate of duplicate 1 is the highest, and standard test specimen has the advantage of high rigidity, low distortion concurrently, therefore present method can effectively reduce the deformation rate after coating thermal treatment, is applicable to the thermal spraying treatment of long limit copper coin.
Claims (3)
1. the long limit of a continuous cast mold copper coin coating hot-spraying method, is characterized in that present method comprises the steps:
Step 1, by the copper coin machining surface processing of long continuous cast mold limit, remove original coating or fatigue layer, be processed into surface to be sprayed;
Step 2, long limit, edge copper coin length direction are progressively corrected, and high, the middle low circular shape in both sides is corrected on copper coin surface to be sprayed, the longest limit, and long limit copper coin limit portion's vertex and middle part lower-most point differ 1-10cm, and arc transition;
Step 3, adopt acetone to carry out oil removal treatment to long limit copper coin surface to be sprayed, adopt organic solvent, alkali lye, acetone, alcohol, weak acid or electrolysis mode cleans and activation treatment;
Step 4, sandblasting is carried out in copper coin surface to be sprayed, long limit, sandblasting rear surface roughness is controlled at Ra4-10;
Step 5, employing supersonic flame carry out thermal spraying treatment to copper coin surface to be sprayed, long limit, and spray material is Ni base coating, and coating is with copper coin surface topography, and coat-thickness is 0.1-2.5mm;
Step 6, long limit copper coin is heat-treated, thermal treatment holding temperature is 800-1100 DEG C, and soaking time is 60min, in heat treatment process, and temperature rise rate and 30 DEG C/h of rate of temperature fall <.
2. the long limit of continuous cast mold according to claim 1 copper coin coating hot-spraying method, it is characterized in that: described Ni base coating component is C content≤0.25w%, Cr content≤15w%, W content≤20w%, B content≤4w%, Si content≤5w%, Mo content 5.0w%, and surplus is Ni.
3. the long limit of continuous cast mold according to claim 1 and 2 copper coin coating hot-spraying method, is characterized in that: the parameter of described hypersonic flame spraying is that oxygen flow is that 900-1200 SLPM, kerosene oil flow are that 3-5L/h, powder feeding rate are that 75-150g/min, rifle are apart from being 20-50cm.
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| CN201210474899.1A CN103834896A (en) | 2012-11-21 | 2012-11-21 | Continuous casting crystallizer long-side copper plate coating thermal spraying method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109576628A (en) * | 2017-09-25 | 2019-04-05 | 上海宝钢工业技术服务有限公司 | The preparation method of continuous cast mold long side copper sheet composite coating |
| CN111085749A (en) * | 2019-12-09 | 2020-05-01 | 安徽工程大学 | Flame spray welding process for surface of copper chute |
| CN111471953A (en) * | 2020-05-20 | 2020-07-31 | 威势特(上海)技术服务有限公司 | Crystallizer copper plate thermal treatment equipment after thermal spraying coating |
| CN112176273A (en) * | 2020-09-15 | 2021-01-05 | 泰尔(安徽)工业科技服务有限公司 | Diffusion welding process for thermal spraying coating of crystallizer copper plate |
| CN113894258A (en) * | 2021-09-23 | 2022-01-07 | 泰尔(安徽)工业科技服务有限公司 | Surface coating of foot roller of continuous casting crystallizer and preparation method thereof |
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| US20040219354A1 (en) * | 2003-05-02 | 2004-11-04 | Deloro Stellite Company | Wear-resistant, corrosion-resistant Ni-Cr-Mo thermal spray powder and method |
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| CN101798669A (en) * | 2009-02-06 | 2010-08-11 | 上海宝钢设备检修有限公司 | Method for thermally spraying protective coating on surface of copper plate of continuous casting crystallizer |
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2012
- 2012-11-21 CN CN201210474899.1A patent/CN103834896A/en active Pending
Patent Citations (3)
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| US20040219354A1 (en) * | 2003-05-02 | 2004-11-04 | Deloro Stellite Company | Wear-resistant, corrosion-resistant Ni-Cr-Mo thermal spray powder and method |
| CN101191225A (en) * | 2006-11-22 | 2008-06-04 | 宝山钢铁股份有限公司 | Antiseptic wearable coat and coating method thereof |
| CN101798669A (en) * | 2009-02-06 | 2010-08-11 | 上海宝钢设备检修有限公司 | Method for thermally spraying protective coating on surface of copper plate of continuous casting crystallizer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109576628A (en) * | 2017-09-25 | 2019-04-05 | 上海宝钢工业技术服务有限公司 | The preparation method of continuous cast mold long side copper sheet composite coating |
| CN109576628B (en) * | 2017-09-25 | 2022-08-05 | 上海宝钢工业技术服务有限公司 | Preparation method of long-side copper plate composite coating of continuous casting crystallizer |
| CN111085749A (en) * | 2019-12-09 | 2020-05-01 | 安徽工程大学 | Flame spray welding process for surface of copper chute |
| CN111471953A (en) * | 2020-05-20 | 2020-07-31 | 威势特(上海)技术服务有限公司 | Crystallizer copper plate thermal treatment equipment after thermal spraying coating |
| CN112176273A (en) * | 2020-09-15 | 2021-01-05 | 泰尔(安徽)工业科技服务有限公司 | Diffusion welding process for thermal spraying coating of crystallizer copper plate |
| CN113894258A (en) * | 2021-09-23 | 2022-01-07 | 泰尔(安徽)工业科技服务有限公司 | Surface coating of foot roller of continuous casting crystallizer and preparation method thereof |
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