CN105936978A - Slag system for preparing high-nitrogen austenitic stainless steel through pressurizing electroslag remelting gas phase nitriding - Google Patents
Slag system for preparing high-nitrogen austenitic stainless steel through pressurizing electroslag remelting gas phase nitriding Download PDFInfo
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- CN105936978A CN105936978A CN201610485525.8A CN201610485525A CN105936978A CN 105936978 A CN105936978 A CN 105936978A CN 201610485525 A CN201610485525 A CN 201610485525A CN 105936978 A CN105936978 A CN 105936978A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of high-nitrogen steel smelting, and particularly relates to a slag system for smelting high-nitrogen austenitic stainless steel through pressurizing electroslag remelting gas phase nitriding. The slag system comprises, by mass percent, 57%-62% of CaF2, 16%-20% of CaO, 12%-16% of Al2O3, 3%-6% of MgO, 0.5%-1.5% of SiO2 and the balance impurities, and the content of the impurities does not exceed 0.8%, wherein the content of CaO/Al2O3 ranges from 1.00 to 1.67. The nitrogen capacity and nitrogen permeability of the slag system are improved by controlling CaO, adjusting the proportional relation of CaO/Al2O3 and allocating the reasonable content of CaF2, MgO and SiO2, the content of nitrogen of the austenitic stainless steel can be effectively increased, nitrogen can be evenly distributed along an ingot body, and the high-quality high-nitrogen austenitic stainless steel can be easily obtained.
Description
Technical field
The present invention relates to a kind of slag system for smelting high-nitrogen steel, be used for, particularly to one, the electroslag weight that pressurizes
The slag system of gas nitriding smelting high-nitrogen austenitic stainless steel is utilized during Rong.
Background technology
Nitrogen is strong austenite stabilizer element, and rustless steel can be promoted to form austenite structure.At nickel
During equivalent calculates, nitrogen equivalent is 30 times of nickel, thus can replace precious metal nickel with cheap nitrogen,
The most all replace nickel, to obtain austenitic stainless steel.Generally, by nitrogen in steel content 0.4%
Above austenitic stainless steel is referred to as high-nitrogen austenitic stainless steel.In high-nitrogen austenitic stainless steel, nitrogen is made
For the interstitial element in steel, by with other alloying element (Mn, Cr, Mo, V, Nb and Ti etc.)
Synergism, the intensity of steel, toughness, creep resistance, wearability, corrosion resistance etc. can be improved multiple
Performance, therefore high-nitrogen austenitic stainless steel is considered as the new material having most research and development to be worth.
At present, the mode of smelting high-nitrogen austenitic stainless steel is broadly divided into interpolation nitro-alloy method and compound electric
Pole method.Wherein, nitro-alloy method (such as nitrided ferro-chromium, nitrogenized manganese, silicon nitride etc.) is added though mode is simple
Single, easy to operate, but it is high, easily by impurity pollution in nitro-alloy, employing Si to there is production cost3N4
Easily make Si exceed standard, many difficult problems such as nitrogen content lack of homogeneity and nitrogen content are difficult to control to；Combination electrode
Method has the advantages such as esr process is steady, surface quality is good, but combination electrode preparation is complicated, welding
Compound electric easily makes ESR ingot oxygen supplement.Compared with above two method, gas nitriding method have low cost,
Product can be avoided by advantages such as nitro-alloy pollutions, thus be that the emphasis of current high-nitrogen austenitic stainless steel is opened
The technology of sending out.
Pressurization electroslag remelting is the main method of current commodity production high-nitrogen austenitic stainless steel.Adding piezoelectricity
In slag reflow process, slag system has very important effect, directly affects the effect of gas nitriding.Nitrogen holds
Being to characterize slag system to accommodate the ability of nitrogen, the slag system that high nitrogen holds is conducive to gas nitriding.And be widely used at present
Traditional electroslag remelting slag (such as 70%CaF2+ 30%Al2O3, 60%CaF2+ 20%CaO+20%Al2O3
And 40%CaF2+ 30%CaO+30%Al2O3) nitrogen hold the most relatively low, pressurization electroslag remelting height nitrogen Ovshinsky
During body is stainless, the nitrogen in gas phase not easily passs through slag and enters in steel, thus is difficult to obtain height
Nitrogen austenitic stainless steel.
Summary of the invention
The problem existed for tradition slag system, the present invention provides a kind of pressurization electroslag remelting gas nitriding to smelt
The slag system of high-nitrogen austenitic stainless steel, by adjusting the composition of slag system, the nitrogen improving slag system holds and nitrogen infiltration
Property, thus ensure the high efficiency of gas nitriding during pressurization electroslag remelting high-nitrogen austenitic stainless steel,
Reduce the addition of nitro-alloy, on the premise of ensureing high-nitrogen austenitic stainless steel composition and performance, fall
Low production cost.
A kind of chemistry one-tenth of the slag system for the electric slag refusion and smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention
Point mass percent is: CaF2: 57～62%, CaO:16～20%, Al2O3: 12～16%, MgO:
3～6%, SiO2: 0.5～1.5%, remaining is impurity, and impurity content is less than 0.8%；Wherein, CaO/Al2O3
It is 1.00～1.67.
The fusing of the slag system of above-mentioned a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes
Temperature is 1250～1325 DEG C.
Above-mentioned a kind of slag system pressurizeing electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel exists
The viscosity of 1500 DEG C is 0.028～0.035Pa s.
Above-mentioned a kind of slag system pressurizeing electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel exists
The resistivity of 1500 DEG C is 0.316～0.408 Ω cm.
Above-mentioned a kind of slag system pressurizeing electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel exists
The nitrogen of 1500 DEG C holds for (0.906～1.309) × 10-13。
The slag system of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes that the present invention completes
Preparation method be: using high-purity fluorite, Calx, commercial alumina, fused magnesite and Silicon stone is raw material,
After weighing raw material according to mentioned component proportioning, mix homogeneously；Fritting stirring at 1550 DEG C～1580 DEG C
At least 30 minutes, then by slag fall in steel tank cooled and solidified to room temperature；Finally being crushed to granularity is
0～10mm, thus prepare pressurization electroslag remelting high-nitrogen austenitic stainless steel slag system.
Making of the slag system of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention
By method it is: by arc ring and 0.45 ± 0.05kg with the institute identical material of smelting high-nitrogen austenitic stainless steel
Striking bits are put on the pressurization electroslag furnace bottom water case below consutrode；By the pre-melted slag prepared 500
DEG C～700 DEG C at toast after 4h～6h, all join in pressurization electroslag furnace crystallizer；Airtight working chamber,
It is filled with the air in nitrogen purge working chamber, carries out solid-state starting the arc slag making；After slag making completes, gradually carry
Nitrogen pressure in high working chamber, Synchronous lifting crystallizer cooling water pressure, and improve electric current and voltage,
Carry out the pressurization electroslag remelting gas nitriding melting of eutectic speed；By step-by-step movement charger according to 0.4kg～0.7kg/
The ratio of ton steel is continuously added aluminum shot or calcium-silicon deoxidation；After pressurization electroslag remelting feeding terminates, open
Pressurization electroslag furnace vent valve pressure release, synchronization reduction cooling water pressure is to normal pressure, after steel ingot cools down completely,
Abjection steel ingot.
A kind of slag system of the electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention with
CaF2For base, content is 57～62%, is not only advantageous to reduce slag fusing point, and is favorably improved slag system
Nitrogen hold and the permeability of nitrogen；For ensureing there is higher basicity, it is thus achieved that good electroslag remelting desulfurized effect,
And improve nitrogen appearance, in slag, add 16～the CaO of 20%；In order to promote the molten nitrogen of slag system further, adjust
CaO/Al2O3It is 1.00～1.67, makes Al2O3Addition be 12～16%；In order to ensure that the nitrogen of slag system holds
And nitrogenizing effect, SiO in slag2Content need to control 0.5～1.5%；Slag adds 3～6% simultaneously
MgO, to replace part CaO.
Theory analysis shows with result of study:
The nitrogen form that is primarily present in slag is free nitrogen (N3-) and non-crossover nitrogen (N-), both
The nitrogen of form can form following network structure with the aluminum in slag and silicon:
Add CaO and can contribute to nitrogen with N with the above-mentioned network structure of depolymerization3-And N-Form dissolve, and
Diffuse in molten steel.Meanwhile, CaO/Al is worked as2O3CaF is added time relatively low2Contribute to the molten nitrogen of slag system.
A kind of nitrogen of the slag system of the electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention
Holding definition is:
Wherein, CNIt is that nitrogen holds；(%N) nitrogen content in slag when to be slag reach balance with nitrogen；
It it is partial pressure of oxygen；It it is nitrogen partial pressure.
The present invention provides the slag system of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes,
It is characterized in that described slag system is high nitrogen solid-holding system.At 1500 DEG C, the computing formula that slag system nitrogen holds is as follows
Described:
logCN=7.442 Λ-19.05
In formula: Λ=(Σ xAnAΔA+xBnBΔB+....)/(ΣxAnA+xBnB+....)；xiFor rubbing of constituent element each in slag system
That mark；niMolal quantity for constituent element each in slag system；ΔiOptical basicity for constituent element each in slag system；CNFor
The nitrogen of slag system holds.
The slag system of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention and biography
It is as shown in table 1 that the nitrogen of system electroslag remelting slag holds result of calculation.As can be seen from the table, with tradition slag system
Compare, the slag system of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention
Nitrogen holds higher, and in the esr process that beneficially pressurizes, gas nitriding is smoothed out.
Table 1 slag system of the present invention holds contrast, wt.% with the nitrogen of tradition electroslag remelting slag
The slag system of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention adds
Add a small amount of SiO2.Owing to eutectic speed pressurization electroslag remelting easily causes ESR ingot surface defect, add few
The SiO of amount2Slag system viscosity can be avoided to decline with temperature and undergo mutation, and make slag system have good intensity
And high-temp plastic, thus improve the surface quality of high-nitrogen austenitic stainless steel ESR ingot.But high level
SiO2It is easily caused the oxidizable melting loss of elements of Al, Ti etc. in steel, and the nitrogen that slag system is greatly lowered holds and oozes
Nitrogen effect, so this slag system is by SiO2It is limited between 0.5～1.5%.
The slag system of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes of the present invention adds
Add the MgO of 3～6%, Substitute For Partial CaO, caused slag system to get damp again to prevent CaO too high, increased
The water content of slag, causes hydrogen, oxygen content in pressurization electroslag furnace smelting high-nitrogen austenitic stainless steel to exceed standard.
The slag of a kind of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes that the present invention proposes
System, on the basis of tradition slag system, regulates CaO/Al by controlling CaO2O3Proportionate relationship, and
And the CaF of configuration reasonable content2, MgO and SiO2, thus obtained a kind of pressurization electroslag remelting gas phase
The slag system of nitriding smelting high-nitrogen austenitic stainless steel, this slag system has rational physical characteristic, higher nitrogen
Hold and the nitrogen permeability of excellence, can effectively promote the nitrogen content of austenitic stainless steel, and nitrogen edge can be made
Ingot body is evenly distributed, and is conducive to obtaining high-quality high-nitrogen austenitic stainless steel.
Detailed description of the invention
The detailed description of the invention of the present invention is described in detail below in conjunction with embodiment, but being embodied as of the present invention
Mode is not limited to following embodiment.
Embodiment 1
The chemistry of the slag system of the pressurization electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel of the present embodiment
Ingredient percent is: CaF2: 59.3%, A12O3: 15%, CaO:18%, MgO:6%,
SiO2: 1%, remaining is impurity.The fusion temperature of this slag system is 1270 DEG C；At a temperature of 1500 DEG C, should
The resistivity of slag system is 0.381 Ω cm, and viscosity is 0.033Pa s, and it is 1.046 × 10 that nitrogen holds-13。
The preparation method of this slag system is: use high-purity fluorite, Calx, commercial alumina, fused magnesite and
Silicon stone is raw material, after weighing raw material according to mentioned component proportioning, and mix homogeneously；Three-phase slag hearth is utilized to exist
Fritting 35 minutes at 1560 DEG C, melting electric current is 1500A, and voltage is 35V, then falls slag in steel
In groove, cooled and solidified is to room temperature；Finally it is crushed to 0～10mm, thus prepares pressurization electroslag remelting height nitrogen
Austenitic stainless steel slag system.
Use above-mentioned pre-melted slag pressurization electroslag remelting 200kg 18Cr2Mo0.5N steel (target nitrogen content is
0.4～0.6%).The vacuum melting furnace that consutrode mother metal is protected by nitrogen is smelted and is obtained, and is forged into diameter
The consutrode of Φ 130mm, its composition is as follows:
The using method of this slag system is: by arc ring and the 0.44kg of material identical with 18Cr2Mo0.5N steel
Striking bits are put on the pressurization electroslag furnace bottom water case below consutrode；By the pre-melted slag prepared 600
Toasting after 5h at DEG C, all join in diameter D is 220mm crystallizer, the quantity of slag is 9kg；Airtight
Pressurization electroslag furnace working chamber, is filled with nitrogen purge；Carrying out solid-state starting the arc slag making, changing slag voltage is 38V,
Changing slag electric current is 2300A, and the change slag time is 24 minutes, completes slag making；After slag making completes, gradually carry
Nitrogen pressure in high working chamber is to 1.6MPa, and Synchronous lifting pressurization electroslag furnace crystallizer cooling water pressure is extremely
1.6MPa, carries out electroslag remelting gas nitriding melting of pressurizeing, smelt electric current and voltage be respectively 3800A and
42V, molten speed is 89kg/h；The aluminum shot simultaneously utilizing step-by-step movement charger to add gross weight 110g carries out deoxidation.
After pressurization electroslag remelting feeding terminates, open pressurization electroslag furnace vent valve pressure release, synchronize to reduce cooling water pressure
Power is to normal pressure, after steel ingot cools down completely, deviates from steel ingot.
Pressurization electroslag remelting 18Cr2Mo0.5N ingot composition is as follows:
Smelting and after terminating be analyzed the nitrogen content of different parts, result is as shown in the table:
From upper table it will be seen that ESR ingot obtained by this example reaches the nitrogen of target steel grade 18Cr2Mo0.5N
Content requirement, nitrogen is evenly distributed along ingot body, and ESR ingot surface quality is good, without slag runner, dross, pipe,
The defect such as fold, slag inclusion.
Embodiment 2
The chemistry of the slag system of the pressurization electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel of the present embodiment
Ingredient percent is: CaF2: 61.7%, A12O3: 12%, CaO:20%, MgO:5%,
SiO2: 0.5%, remaining is impurity.The fusion temperature of this slag system is 1260 DEG C；At a temperature of 1500 DEG C,
The resistivity of this slag system is 0.318 Ω cm, and viscosity is 0.030Pa s, and it is 1.288 × 10 that nitrogen holds-13。
The preparation method of this slag system is: use high-purity fluorite, Calx, commercial alumina, fused magnesite and
Silicon stone is raw material, after weighing raw material according to mentioned component proportioning, and mix homogeneously；Three-phase slag hearth is utilized to exist
Fritting 40 minutes at 1570 DEG C, melting electric current is 1500A, and voltage is 35V, then falls slag in steel
In groove, cooled and solidified is to room temperature；Finally it is crushed to 0～10mm, thus prepares pressurization electroslag remelting height nitrogen
Austenitic stainless steel slag system.
Use above-mentioned pre-melted slag pressurization electroslag remelting 200kg 23Cr4Ni2Mo0.75N steel (target nitrogen contains
Amount is 0.6～0.8%).The vacuum melting furnace that consutrode mother metal is protected by nitrogen is smelted and is obtained, and is forged into
The consutrode of diameter of phi 130mm, its composition is as follows:
Smelting and after terminating be analyzed the nitrogen content of different parts, result is as shown in the table:
From upper table it will be seen that the ESR ingot obtained by this example reaches target steel grade 23Cr4Ni2Mo0.75N
Requirement of nitrogen, nitrogen is evenly distributed along ingot body, and ESR ingot surface quality is good, without slag runner, dross,
Pipe, fold, slag inclusion.
Claims (6)
1. pressurize the slag system of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel, and its feature exists
In, the composition of this slag system is CaF by weight percentage2: 57～62%, CaO:16～20%, Al2O3:
12～16%, MgO:3～6%, SiO2: 0.5～1.5%, remaining is impurity, and impurity content is less than 0.8%；
Wherein, CaO/Al2O3It is 1.00～1.67；The fusion temperature of slag system is 1250～1325 DEG C.
2. according to a kind of pressurization electroslag remelting gas nitriding smelting high-nitrogen austenite described in claim 1
Stainless slag system, it is characterised in that slag system is 0.028～0.035Pa s at the viscosity of 1500 DEG C.
3. according to a kind of pressurization electroslag remelting gas nitriding smelting high-nitrogen austenite described in claim 1
Stainless slag system, it is characterised in that slag system is 0.316～0.408 Ω cm the resistivity of 1500 DEG C.
4. according to a kind of pressurization electroslag remelting gas nitriding smelting high-nitrogen austenite described in claim 1
Stainless slag system, it is characterised in that slag system holds for (0.906～1.309) × 10 at the nitrogen of 1500 DEG C-13。
5. pressurize the preparation method of electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel slag system,
It is characterized in that, described method includes: use high-purity fluorite, Calx, commercial alumina, fused magnesite
It is primary raw material with Silicon stone, is CaF by weight percentage2: 57～62%, CaO:16～20%, Al2O3:
12～16%, MgO:3～6%, SiO2: 0.5～1.5%, remaining is after the composition proportion of impurity weighs raw material,
Mix homogeneously；At 1550 DEG C～1580 DEG C fritting and stir at least 30 minutes, then by slag fall in steel
In groove, cooled and solidified is to room temperature；Finally be crushed to granularity be 0～10mm prepare pressurization electroslag remelting height nitrogen
Austenitic stainless steel slag system.
6. the user of the slag system of the electroslag remelting gas nitriding smelting high-nitrogen austenitic stainless steel that pressurizes
Method, it is characterised in that described method includes: by with the institute identical material of smelting high-nitrogen austenitic stainless steel
Arc ring and 0.45 ± 0.05kg striking bits are put on the pressurization electroslag furnace bottom water case below consutrode
On；Pressurization electroslag is all joined after the pre-melted slag prepared is toasted 4h～6h at 500 DEG C～700 DEG C
In stove crystallizer；Airtight working chamber, is filled with the air in nitrogen purge working chamber, carries out the solid-state starting the arc and makes
Slag；After slag making completes, gradually step up the nitrogen pressure in working chamber, Synchronous lifting crystallizer cooling water
Pressure, and improve electric current and voltage, carry out the pressurization electroslag remelting gas nitriding melting of eutectic speed.
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| CN106756485A (en) * | 2016-12-13 | 2017-05-31 | 东北大学 | A kind of method that sensing of pressurizeing prepares high nitrogen steel with electroslag furnace under protective Ar gas remelting duplex |
| CN108193130A (en) * | 2017-12-28 | 2018-06-22 | 辽宁福鞍重工股份有限公司 | A kind of method for centrifuging electroslag smelting casting production high ferro brake disc |
| CN108315563A (en) * | 2017-12-19 | 2018-07-24 | 重庆材料研究院有限公司 | A kind of electroslag remelting slag of super-duplex stainless steel |
| CN112458304A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Electroslag remelting slag system for smelting ultra-low-carbon low-aluminum high-titanium maraging steel |
| CN114854993A (en) * | 2022-03-30 | 2022-08-05 | 重庆材料研究院有限公司 | Seawater corrosion resistant high-strength stainless steel electroslag remelting slag system |
| CN115386735A (en) * | 2022-07-21 | 2022-11-25 | 重庆材料研究院有限公司 | Electroslag remelting slag system for controlling nitrogen content in alloy |
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| CN106756485A (en) * | 2016-12-13 | 2017-05-31 | 东北大学 | A kind of method that sensing of pressurizeing prepares high nitrogen steel with electroslag furnace under protective Ar gas remelting duplex |
| CN106756485B (en) * | 2016-12-13 | 2019-01-08 | 东北大学 | A method of pressurization induction prepares high nitrogen steel with electroslag furnace under protective Ar gas remelting duplex |
| CN108315563A (en) * | 2017-12-19 | 2018-07-24 | 重庆材料研究院有限公司 | A kind of electroslag remelting slag of super-duplex stainless steel |
| CN108315563B (en) * | 2017-12-19 | 2020-02-14 | 重庆材料研究院有限公司 | Electroslag remelting slag system of super duplex stainless steel |
| CN108193130A (en) * | 2017-12-28 | 2018-06-22 | 辽宁福鞍重工股份有限公司 | A kind of method for centrifuging electroslag smelting casting production high ferro brake disc |
| CN112458304A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Electroslag remelting slag system for smelting ultra-low-carbon low-aluminum high-titanium maraging steel |
| CN114854993A (en) * | 2022-03-30 | 2022-08-05 | 重庆材料研究院有限公司 | Seawater corrosion resistant high-strength stainless steel electroslag remelting slag system |
| CN115386735A (en) * | 2022-07-21 | 2022-11-25 | 重庆材料研究院有限公司 | Electroslag remelting slag system for controlling nitrogen content in alloy |
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