CN105132703A - Method for smelting nitrogenous Co-Cr-Mo alloy for surgical implanting through electroslag remelting furnace - Google Patents
Method for smelting nitrogenous Co-Cr-Mo alloy for surgical implanting through electroslag remelting furnace Download PDFInfo
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- CN105132703A CN105132703A CN201510567571.8A CN201510567571A CN105132703A CN 105132703 A CN105132703 A CN 105132703A CN 201510567571 A CN201510567571 A CN 201510567571A CN 105132703 A CN105132703 A CN 105132703A
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- slag
- slag charge
- nitrogen
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- 238000000034 method Methods 0.000 title claims abstract description 16
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims abstract description 6
- 238000003723 Smelting Methods 0.000 title claims abstract description 5
- 229910001182 Mo alloy Inorganic materials 0.000 title abstract 4
- 239000002893 slag Substances 0.000 claims abstract description 82
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 32
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 229910000771 Vitallium Inorganic materials 0.000 claims description 20
- 239000000602 vitallium Substances 0.000 claims description 20
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 241001417490 Sillaginidae Species 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 4
- 239000005864 Sulphur Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005204 segregation Methods 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000009491 slugging Methods 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000003466 welding Methods 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 3
- 239000010952 cobalt-chrome Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007499 fusion processing Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention belongs to the field of metallurgy and relates to a method for smelting nitrogenous Co-Cr-Mo alloy for surgical implanting through an electroslag remelting furnace. The method comprises the following steps: I, preparing an electrode and slag charge, welding a Co-Cr-Mo alloy stun rod and an artificial electrode together, and using a slag charge feeder to add the slag charge to be remelted; II, closing the furnace and filling nitrogen continuously for 2 minutes and then stopping nitrogen supply, and starting a cooling circulation system; III, arcing and slugging, and adopting a power, current, voltage and slag resistance comprehensive control method; IV, after slag charge adding, supplying nitrogen continuously; V, after the finish of an arcing period, starting a melting period, adopting a melting speed and slag swing control method, and stabilizing the melting speed to be 5kg/min; VI, adopting a stepped power reduction method during a hot top sealing process; and VII, cooling and demoulding inside the furnace. The Co-Cr-Mo alloy remelted by adopting the method is excellent in ESR ingot segregation control, N element is evenly distributed, the burning loss is less than 5 percent, the content of sulphur is lower than 10 ppm, and the ingot surface is free from the defect of slag troughs.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of method that the nitrogenous vitallium of Srgery grafting smelted by electroslag furnace.
Background technology
Vitallium has excellent mechanical property, corrosion resistance nature and biocompatibility, is the important materials of orthopaedics metal implant.And the vitallium of forging is applied to high-end cobalt chrome molybdenum joint prosthesis with its more excellent mechanical property.
Vitallium ISO5832-12:2007 can be forged in ISO cobalt base alloy standard and define high-carbon and the serial alloy standard analysis of low-carbon (LC) two, as shown in table 1:
Table 1 chemical composition
| C | Cr | Mo | Fe | Mn | Si | Ni | N | Co | |
| Low-carbon (LC) | ≤0.14 | 26.0～30.0 | 5.0～7.0 | ≤0.75 | ≤1.0 | ≤1.0 | ≤1.0 | ≤0.25 | More than |
| High-carbon | 0.15～0.35 | 26.0～30.0 | 5.0～7.0 | ≤0.75 | ≤1.0 | ≤1.0 | ≤1.0 | ≤0.25 | More than |
High-carbon series vitallium, its nitrogen element content of general control is at lower level, there is the higher but deficiency that toughness is lower of intensity, and low-carbon high-nitrogen vitallium can significantly not fall the toughness improving vitallium under low intensive prerequisite, this is being because carbide main in cobalt base alloy is Cr
23c
6, under certain temperature condition, separate out tiny carbide during Slow cooling at crystal boundary and interdendritic, can stop Grain Boundary Sliding, the strengthening effect of alloy is obvious, but low-alloyed cold-forming property seriously falls in too much carbide; Nitrogen is the alloying element of stable austenite tissue, and adding of nitrogen also can reduce the diffusion of chromium in austenite, reduces the precipitation of grain boundary carbide, improves toughness; The carbonitride that the nitrogen element be present in austenitic steel with solution forms small stable provides disperse educt to strengthen, and improves intensity and the hardness of material.
Esr can effectively improve alloy purity, and to reduce in alloy the harmful element content such as sulphur, the alloy simultaneously adopting electroslag remelting process to prepare has good solidified structure.But, for esr height nitrogen vitallium, both needed to solve alloy easy segregation element (as molybdenum element) content high, the improper segregation causing ingot casting of process choice, need strictly to control the scaling loss of nitrogen element in alloy and the even situation of distribution thereof simultaneously, melting technology is had higher requirement.
Summary of the invention
For the esr Problems existing of high nitrogen vitallium, the present invention proposes a kind of method that electroslag remelting furnace smelts the nitrogenous vitallium of Srgery grafting.Process program provided by the invention is,
I, electrode, slag charge prepare
Vitallium electrode bar and dummy electrode are welded together, slag charge adds device and adds remelting slag charge; The vitallium section that run-on plate uses diameter consistent with electrode diameter, thickness is about 20 ~ 30mm,
Slag charge adopts quaternary slag: its weight ratio is CaF
2: 45-55%, CaO:25-30%, Al
2o
3: 15-20%, MgO:3-5%;
II, conjunction stove inflated with nitrogen
After 5 minutes, cooling recirculation system is opened to electroslag remelting furnace the supply of nitrogen with the speed of 100L/min;
III, an arcing slag
At the uniform velocity add slag charge with the speed of 2.5 ~ 3.0kg/min, carry out arcing slag; Slag charge add-on is that after slag charge fusing, depth of slag bath is between 12 ~ 14cm, and the calculation formula of slag charge add-on is such as formula (1).
W=π × (D/2) × (D/2) × ρ × h ... formula (1)
In formula:
W-add the quantity of slag, kg
D-ingot shape diameter, m
H-depth of slag bath, m
ρ-slag density, kg/m
3,
IV, nitrogen protection
Add after slag completes, continue the supply of nitrogen, flow is 10L/min, is supplied to melting always and terminates;
V, melting
After the starting the arc stage terminates, smelting period, stably fused speed 5kg/min;
VI, heat-sealing top
Take staged to fall the feeding of power mode four stage decreasing power, 0min, 10min, 20min, 40min respectively after the beginning is backed down in heat-sealing reduce 10% of smelt stage power in latter stage, and last invariable power insulation, until melting terminates;
Cooling, the demoulding in VII, stove.
The demoulding after cooling 90min in stove.
The advantage that the present invention has and beneficial effect, the vitallium ingot casting nitrogen element using present method to produce is evenly distributed end to end, and its scaling loss amount is less than 5%; The quaternary used reuses slag system good sweetening effectiveness, to use in the vitallium of this slag system melting sulphur content lower than 10ppm; To make in alloy without slag, the metallurgical imperfection such as to be mingled with; Ingot casting smooth surface, without slag runner defect; Use this remelting processing process control to stablize, play arcing slag good, without non-slag bear bottom ingot casting; Ingot top feeding is good, and ingot casting lumber recovery increases.
Embodiment
Below in conjunction with example in detail the specific embodiment of the present invention, but the specific embodiment of the present invention is not limited to following example:
I electrode, slag charge prepare
Electrode bar and dummy electrode are welded together, automatically feeds in slag device and add remelting slag charge; The vitallium section that striking ingot uses diameter consistent with electrode diameter, thickness is about 20 ~ 30mm, and centering crystalliser feet is placed; If desired consumable electrode rod is toasted, remove surface-moisture.
Slag charge adopts the fritting quaternary slag of sealing, and its proportioning is as follows: CaF
2: 45-55%, CaO:25-30%, Al
2o
3: 15-20%, MgO:3-5%;
After slag charge add-on generally should ensure slag charge fusing, depth of slag bath, between 12 ~ 14cm, after having smelted, ensures that slag cap thickness is not less than 8cm.Concrete height can be determined according to ingot length, and spindle is long, and slag crust is many, and slag charge then should be added into some.
The calculation formula of slag charge add-on is such as formula (1).
W=π × (D/2) × (D/2) × ρ × h ... formula (1)
In formula:
W-add the quantity of slag, kg
D-ingot shape diameter, m
H-depth of slag bath, m
ρ-slag density, kg/m
3
II closes stove inflated with nitrogen
Close seal closure, within 5 minutes without interruption, close gas supply after nitrogen with the flow of 100L/min, now nitrogen is full of whole body of heater, opens cooling water recirculation system;
III plays arcing slag
The starting the arc of 18 ~ 22V low voltage, low power power transmission, improves voltage to 40 ~ 50V after 3 ~ 10 minutes, high-power power transmission, at the uniform velocity adds slag charge with the speed of 2.5 ~ 3.0kg/min simultaneously;
IV nitrogen protection
Add after slag completes, continue the supply of nitrogen, flow is 10NL/min, until melting terminates;
V melting
After the starting the arc stage terminates, smelting period, stably fused speed 5kg/min, fusion process controls slag resistance 3.5m Ω ~ 4.5m Ω, and slag pendulum 0.5m Ω ensures that electrode tip inserts shallow flat;
VI seals top
Hot cap process takes four stage stageds to fall power feeding, and 0min, 10min, 20min, 40min respectively after the beginning is backed down in heat-sealing reduce 10% of smelt stage power in latter stage, last invariable power insulation; Increase slag resistance and slag pendulum gradually, residue electrode bar is separated with slag bath convergence;
Cooling, the demoulding in VII stove.
The demoulding after cooling 90min in stove.
Embodiment
Nitrogen element content and distribute as shown in table 2 in electrode:
Nitrogen element content and distribution in table 2 cobalt chrome molybdenum electrode bar
| Sample position (from the head to the tail) | 1 | 2 | 3 |
| Content | 0.20 | 0.21 | 0.20 |
Electrode size:
Crystallizer diameter:
Slag charge adopts quaternary slag: CaF
2: 45-55%, CaO:25-30%, Al
2o
3: 15-20%, MgO:3-5%.Quantity of slag 55kg;
I electrode, slag charge prepare
Electrode bar and dummy electrode are welded together, automatically feeds in slag device and add 60kg remelting slag charge; Striking ingot uses the vitallium section of diameter 350mm, and thickness is about 26mm.
II closes stove inflated with nitrogen
100L/min closes gas supply after nitrogen in 5 minutes without interruption, opens cooling water recirculation system;
III plays arcing slag
The starting the arc of 18V low voltage, 150kw power transmission, improves voltage to 40 ~ 50V, 400kw power transmission after 3 ~ 10 minutes, at the uniform velocity add slag charge with the speed of 2.5 ~ 3.0kg/min simultaneously;
IV nitrogen protection
Add after slag completes, continue the supply of nitrogen, flow is 10NL/min;
V melting
After the starting the arc stage terminates, stably fused speed 5kg/min, fusion process controls slag resistance 3.5m Ω ~ 4.5m Ω, slag pendulum 0.5m Ω;
VI seals top
Power feeding falls in four stage stageds, and per stage falls 60kw, 20kw, 40kw, 5kw respectively, last invariable power insulation; Increase slag resistance gradually to 5.0m Ω ~ 6.0m Ω, slag pendulum control 0.5m Ω ~ 0.6m Ω;
Cooling, the demoulding in VII stove.
The demoulding after cooling 90min in stove.
Constituent content and distribute as shown in table 3 in ESR ingot:
Nitrogen element content and distribution in table 3 cobalt chrome molybdenum ESR ingot
| Sample position (from the head to the tail) | 1 | 2 | 3 | 4 | 5 |
| Content | 0.19 | 0.20 | 0.20 | 0.20 | 0.20 |
In ingot, sulphur content is reduced to 6ppm by the 84ppm of electrode, and ingot body is smooth without slag runner defect.
Claims (1)
1. electroslag remelting furnace smelts a Srgery grafting method for nitrogenous vitallium, and it is characterized in that, it comprises following step successively:
I, electrode, slag charge prepare
Vitallium electrode bar and dummy electrode are welded together, slag charge adds device and adds remelting slag charge; The vitallium section that run-on plate uses diameter consistent with electrode diameter, thickness is about 20 ~ 30mm,
Slag charge adopts quaternary slag: its weight ratio is CaF
2: 45-55%, CaO:25-30%, Al
2o
3: 15-20%, MgO:3-5%;
II, conjunction stove inflated with nitrogen
After 5 minutes, cooling recirculation system is opened to electroslag remelting furnace the supply of nitrogen with the speed of 100L/min;
III, an arcing slag
At the uniform velocity add slag charge with the speed of 2.5 ~ 3.0kg/min, carry out arcing slag; Slag charge add-on is that after slag charge fusing, depth of slag bath is between 12 ~ 14cm, and the calculation formula of slag charge add-on is such as formula (1).
W=π × (D/2) × (D/2) × ρ × h ... formula (1)
In formula:
W-add the quantity of slag, kg
D-ingot shape diameter, m
H-depth of slag bath, m
ρ-slag density, kg/m
3,
IV, nitrogen protection
Add after slag completes, continue the supply of nitrogen, flow is 10L/min, is supplied to melting always and terminates;
V, melting
After the starting the arc stage terminates, smelting period, stably fused speed 5kg/min;
VI, heat-sealing top
Take staged to fall the feeding of power mode four stage decreasing power, 0min, 10min, 20min, 40min respectively after the beginning is backed down in heat-sealing reduce 10% of smelt stage power in latter stage, and last invariable power insulation, until melting terminates;
Cooling, the demoulding in VII, stove
The demoulding after cooling 90min in stove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510567571.8A CN105132703A (en) | 2015-09-08 | 2015-09-08 | Method for smelting nitrogenous Co-Cr-Mo alloy for surgical implanting through electroslag remelting furnace |
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|---|---|---|---|
| CN201510567571.8A CN105132703A (en) | 2015-09-08 | 2015-09-08 | Method for smelting nitrogenous Co-Cr-Mo alloy for surgical implanting through electroslag remelting furnace |
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| Publication Number | Publication Date |
|---|---|
| CN105132703A true CN105132703A (en) | 2015-12-09 |
Family
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|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676444A (en) * | 2017-01-06 | 2017-05-17 | 江苏隆达超合金航材股份有限公司 | Forming method for cobalt-chromium-molybdenum superalloy bar |
| CN107190160A (en) * | 2017-06-27 | 2017-09-22 | 西安聚能装备技术有限公司 | A kind of composite control method for electroslag furnace melting high temperature alloy |
| CN107365925A (en) * | 2017-06-26 | 2017-11-21 | 东莞市翔通光电技术有限公司 | A kind of N doping cochrome and preparation method thereof, application |
| CN110408792A (en) * | 2019-07-23 | 2019-11-05 | 河钢股份有限公司 | The method of electroslag furnace under protective Ar gas remelting high nitrogen steel |
| CN114015889A (en) * | 2021-10-19 | 2022-02-08 | 河南中原特钢装备制造有限公司 | Nitrogen-filled electroslag process for hollow billet cavity of nitrogen-containing steel |
| CN114990387A (en) * | 2022-07-20 | 2022-09-02 | 无锡卡仕精密科技有限公司 | Cobalt-chromium-molybdenum alloy implant and preparation method thereof |
| CN120519707A (en) * | 2025-07-21 | 2025-08-22 | 东北大学 | A method for controlling the shrinkage depth of an ingot crown with hot capping during electroslag remelting |
| CN120519707B (en) * | 2025-07-21 | 2025-12-26 | 东北大学 | A method for controlling the shrinkage cavity depth of ingot crown during hot capping in electroslag remelting process |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676444A (en) * | 2017-01-06 | 2017-05-17 | 江苏隆达超合金航材股份有限公司 | Forming method for cobalt-chromium-molybdenum superalloy bar |
| CN106676444B (en) * | 2017-01-06 | 2018-06-26 | 江苏隆达超合金航材股份有限公司 | A kind of forming method of cobalt chrome molybdenum superalloy bar |
| CN107365925A (en) * | 2017-06-26 | 2017-11-21 | 东莞市翔通光电技术有限公司 | A kind of N doping cochrome and preparation method thereof, application |
| CN107365925B (en) * | 2017-06-26 | 2019-12-24 | 深圳市翔通光电技术有限公司 | Nitrogen-doped cobalt-chromium alloy and preparation method and application thereof |
| CN107190160A (en) * | 2017-06-27 | 2017-09-22 | 西安聚能装备技术有限公司 | A kind of composite control method for electroslag furnace melting high temperature alloy |
| CN110408792A (en) * | 2019-07-23 | 2019-11-05 | 河钢股份有限公司 | The method of electroslag furnace under protective Ar gas remelting high nitrogen steel |
| CN110408792B (en) * | 2019-07-23 | 2020-11-06 | 河钢股份有限公司 | Method for remelting high-nitrogen steel by electroslag in protective atmosphere |
| CN114015889A (en) * | 2021-10-19 | 2022-02-08 | 河南中原特钢装备制造有限公司 | Nitrogen-filled electroslag process for hollow billet cavity of nitrogen-containing steel |
| CN114990387A (en) * | 2022-07-20 | 2022-09-02 | 无锡卡仕精密科技有限公司 | Cobalt-chromium-molybdenum alloy implant and preparation method thereof |
| CN114990387B (en) * | 2022-07-20 | 2022-11-25 | 无锡卡仕精密科技有限公司 | Cobalt-chromium-molybdenum alloy implant and preparation method thereof |
| CN120519707A (en) * | 2025-07-21 | 2025-08-22 | 东北大学 | A method for controlling the shrinkage depth of an ingot crown with hot capping during electroslag remelting |
| CN120519707B (en) * | 2025-07-21 | 2025-12-26 | 东北大学 | A method for controlling the shrinkage cavity depth of ingot crown during hot capping in electroslag remelting process |
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