CN104862609B - Method for pressurized induction smelting of high nitrogen stainless steel through pressure control in stages - Google Patents
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Abstract
The present invention discloses a method for pressurized induction smelting of high nitrogen stainless steel through pressure control in stages, and belongs to the technical field of high nitrogen stainless steel smelting. The high nitrogen stainless steel smelted by the method comprises less than or equal to 0.2% of C, 12-23% of Mn, 15-24% of Cr, less than or equal to 1% of Si, 0-4.5% of Mo, 0.7-2% of N, 0-4.5% of Ni, and the balance of Fe. The method specifically comprises: preparing materials and determining pressurization parameters in stages; loading the materials; vacuumizing to achieve 10 Pa, and then carrying out electrifying heating; filling nitrogen gas with a purity of more than or equal to 99.99% to achieve smelting pressure after the raw material is subjected to steelmaking, alloying, and carrying out thermal insulation for 10-15 min; and filling high purity nitrogen gas until achieving a casting pressure, and then casting. According to the present invention, the nitridized alloy addition amount is optimized and the smelting pressure and the casting pressure are reasonably controlled, such that the problems of serious nitrogen segregation, nitrogen precipitation, nitrogen gas pore formation and the like during the high nitrogen stainless steel solidification process are effectively solved.
Description
Technical field
The invention belongs to high nitrogen stainless steel technical field of smelting, and in particular to a kind of pressurization sensing of control by stages pressure
The method of smelting high nitrogen stainless steel.
Background technology
It is stainless that nitrogen has been widely applied to austenitic stainless steel, two phase stainless steel and martensite as important alloying element
In steel, by the collective effect with other alloying elements such as Mn, Cr, Mo, V, Nb and Ti etc., the strong of steel can be not only significantly improved
The multiple performances such as degree, toughness, creep resistance, wearability and corrosion resistance, and nitrogen adds as a kind of strong austenite former
Also replace the expensive Ni elements in part in entering austenitic stainless steel, thus high nitrogen stainless steel be increasingly becoming it is a kind of important
Engineering material, the fields such as electric power, shipbuilding, railway, petrochemical industry, medical Artificial bone material will be widely used in.But by
In the not perfect enough of high nitrogen steel technology of preparing and technique, the development of high nitrogen steel is also subject to certain restrictions, therefore is devoted to development
High nitrogen steel technology of preparing, promotes China's high nitrogen steel large-scale production to be one of current urgent problem.
For the high nitrogen stainless steel that nitrogen content exceedes normal pressure nitrogen solubility, it is difficult at ambient pressure prepare, is guarantor
Card molten steel obtains higher nitrogen content, and its smelting process must be carried out in pressured atmosphere, particularly be needed in casting cycle
Higher ambient pressure, to avoid, the composition that nitrogen is caused due to phase transformation and segregation in high nitrogen stainless steel process of setting is uneven, nitrogen
Separate out the problem with stomatal limiting value.At present, pressurization induction furnace provides important equipment for the variety development of high nitrogen stainless steel and protects
Barrier.
Two hang-ups are faced with during using pressurization induction furnace smelting high nitrogen stainless steel, i.e., how quick nitrogen pick-up is simultaneously real
The precise control of existing nitrogen in steel content, while how to determine rational casting pressure to avoid nitrogen in process of setting is serious inclined
Analysis, precipitation and stomatal limiting value.Due to the difference of nitrogen dissolubility in solid phase (δ/γ phases) and molten steel, result in pressurization induction furnace
Smelt that pressure is different with casting pressure, increase is smelted pressure and can effectively improve nitrogen content in molten steel, improves casting and presses
Power is then conducive to avoiding the precipitation and the formation of pore of nitrogen during solidification of molten steel.But pressure is smelted to casting pressure (it is higher than
Smelt pressure) in transition process, higher casting pressure accelerates gas phase while the formation of the precipitation and pore that solve nitrogen
Nitriding process, in causing high nitrogen stainless steel, nitrogen content is exceeded, during increasing pressurization induction furnace melting high nitrogen stainless steel
The difficulty of Control of Nitrogen Content.
The content of the invention
During pressurized Induction Melting prepares high nitrogen stainless steel, nitrification is controlled how effectively and reasonably, at low cost
Smelting pressure and casting pressure in golden addition, induction furnace, is the core for improving Control of Nitrogen Content accurately and avoiding coagulation defect
The heart and key.Therefore, the invention discloses a kind of method of the pressurization sensing smelting high nitrogen stainless steel of control by stages pressure, is somebody's turn to do
Method is applied to smelts all kinds of high nitrogen stainless steel steel grades, and for example, the target component of high nitrogen stainless steel steel grade can be：C：≤
0.2%, Mn：12～23%, Cr：15～24%, Si：≤ 1%, Mo：0～4.5%, N：0.7～2%, Ni：0～4.5%, Fe：
For surplus.The angle of smelting pressure of the present invention from control nitrogen alloy addition, induction furnace and casting pressure is started with, by excellent
Furnace pressure when changing nitro-alloy addition and rationally controlling furnace pressure and casting when smelting, has invented one kind and has more closed
The nitrogen alloying method that reason, high nitrogen stainless steel efficiently, economic are smelted, have effectively achieved using the high nitrogen of pressurization induction furnace melting
Stainless Composition Control, in solution high nitrogen stainless steel process of setting the problems such as the macrosegregation of nitrogen, precipitation and nitrogen pore.
A kind of method of pressurization sensing smelting high nitrogen stainless steel, the method include step in detail below：
(1) dispensing is determined with pressure parameter：According to steel grade target component, 1. calculated in induction furnace by following formula
Smelt pressure P1, and the casting pressure P in coming out of the stove 2. is calculated with reference to formula2, while nitrogen in raw materials for metallurgy 3. can be obtained according to formula
It is actually added into percentage by weight (wt%)1；With the percentage by weight that this combines raw materials for metallurgy needed for raw materials for metallurgy composition is calculated, match somebody with somebody
Raw materials for metallurgy processed, adds 1.0～2.0kg/t electrolytic aluminiums, and for deoxidation, wherein raw materials for metallurgy includes：Ingot iron, crome metal or
Ferrochrome, metal molybdenum or molybdenum-iron, metallic nickel, manganese metal, industrial silicon, chromium nitride, graphite etc..
Steel grade target component (by weight percentage) is：C：≤ 0.2%, Mn：12～23%, Cr：15～24%, Si：≤
1%, Mo：0～4.5%, N：0.7～2%, Ni：0～4.5%, Fe：Surplus.
Smelt pressure P1Computing formula 1.：
+ 0.011 [%Ni]+3.5 × 10 of A=0.13 [%N]+0.118 [%C]+0.043 [%Si]-5[%Ni]2
- 0.024 [%Mn]+3.2 × 10-5[%Mn]2- 0.01 [%Mo]+7.9 × 10-5[%Mo]2
- 0.048 [%Cr]+3.5 × 10-4[%Cr]2
In formula：P1For smelting pressure, PθFor normal atmosphere, T is smelting temperature.
The computing formula of casting pressure P2 is 2.：
P2=[(0.25～0.40) P1/Pθ+ (0.15～0.65)] MPa.
In raw materials for metallurgy, nitrogen is actually added into percentage by weight (wt%)1Computing formula 3.：
(wt%)1=[- 0.02P1/Pθ+ (0.66～0.76)] × (wt%)N。
In formula：(wt%)NFor the weight percentage of nitrogen in target steel grade.
(2) feed：Ingot iron, crome metal or ferrochrome, metal molybdenum or molybdenum-iron, metallic nickel are put in crucible induction furnace,
The manganese metal of oxidizable or volatilization, industrial silicon, chromium nitride, electrolytic aluminium, graphite etc. are placed in feeding chamber.
(3) it is load melting：Below 10Pa will be evacuated in induction furnace, and energization is warming up in pressurization induction furnace in crucible
Furnace charge all melt.
(4) alloying：In crucible induction furnace to be pressurised raw materials for metallurgy fully melt reach it is melting down after, fill into induction furnace
High pure nitrogen to the pressure for entering purity >=99.999% is P1, industry is sequentially added by feeding chamber in crucible in stove then
Silicon, manganese metal, chromium nitride, graphite carry out alloying, while adding electrolysis aluminium deoxidation, and are incubated at a temperature of 1530～1600 DEG C
10～15min.
(5) cast：High pure nitrogen to the furnace pressure for being filled with purity >=99.999% into pressurization induction furnace is P2, then
Cast；After casting terminates, pressure release is cooled down, take out ingot casting, wherein cast temperature is 1530～1580 DEG C, when being pressurized and casting
Between altogether be 8～15min.
Theory analysis is shown with result of study：
1) affect the factor of nitrogen dissolubility in rustless steel to be mainly alloying component, temperature and pressure, in alloying component and
Under conditions of smelting temperature determines, the high nitrogen stainless steel for obtaining target nitrogen content need to be by the smelting Stress control in stove certain
Within the scope of.Through nitrogen solubility thermodynamic analysis and experimental study, the present invention proposes to smelt pressure P1Computing formula 1..
2), in casting cycle, in process of setting, the formation of δ/γ phases reduces the dissolving of nitrogen in system to high nitrogen stainless steel
Spend, easily cause nitrogen to separate out and stomatal limiting value problem, pressure when improving casting in stove is to avoid effectively arranging for problem appearance
One of apply.Study through lot of experiments, the present invention draws aforesaid with regard to the pressure P that casts2Empirical equation 2..
3) higher casting pressure accelerates gas nitriding process while the formation of the precipitation and pore that solve nitrogen,
In causing high nitrogen stainless steel, nitrogen content is exceeded；The present invention is modified to the nitrogen addition in raw material, nitrogen alloy when reducing dispensing
Addition, realize the effective control of nitrogen content, 3. wherein nitrogen alloy addition level calculates determination by aforesaid empirical equation.
The present invention provides a kind of method of the pressurization sensing smelting high nitrogen stainless steel of control by stages pressure, its advantage
It is：The composition of high nitrogen stainless steel is efficiently controlled, and by smelting the reasonable control of pressure and casting pressure, has solved high nitrogen not
The problem of rust steel nitrogen pore, while can also be effectively reduced production cost.
Specific embodiment
The invention will be further described with reference to embodiments.
In illustrated embodiment of the present invention, smelting equipment is 25kg pressurized Induction Melting stoves, and final vacuum is 0.1Pa, electricity
Source power is 50kW, and batch is 20.0～21.5kg.It is below dispensing and formula to be used in pressure parameter calculating, i.e.,
Formula 1., formula 2., formula 3..
Formula is 1.：
+ 0.011 [%Ni]+3.5 × 10 of A=0.13 [%N]+0.118 [%C]+0.043 [%Si]-5[%Ni]2
- 0.024 [%Mn]+3.2 × 10-5[%Mn]2- 0.01 [%Mo]+7.9 × 10-5[%Mo]2
- 0.048 [%Cr]+3.5 × 10-4[%Cr]2
In formula：P1For smelting pressure, PθFor normal atmosphere, T is smelting temperature.
Formula is 2.：
P2=[(0.25～0.40) P1/Pθ+ (0.15～0.65)] MPa.
In formula：P2For pressure of casting.
Formula is 3.：
In formula：(wt%)1Weight percentage is actually added into for nitrogen in raw materials for metallurgy, (wt%)NFor nitrogen in target steel grade
Weight percentage.
In illustrated embodiment of the present invention, the main component of raw materials for metallurgy used is shown in Table 1.
1 raw materials for metallurgy main component (wt%) of table
| Species | Fe | Cr | N | Mn | Ni | Mo | Si | Cu | Al | C | P | S |
| Ingot iron | 99.9 | - | 0.0036 | - | - | - | - | - | 0.002 | 0.0024 | 0.01 | 0.0034 |
| Crome metal | 0.19 | 9.17 | 0.032 | - | - | - | 0.23 | 0.002 | 0.14 | 0.008 | ≤0.003 | 0.0048 |
| Metal molybdenum | 0.0045 | - | 0.0001 | - | 0.0031 | 99.98 | 0.0007 | - | 0.0005 | 0.001 | 0.001 | - |
| Metallic nickel | 0.0019 | - | - | 0.0006 | 99.99 | - | 0.0016 | 0.0015 | - | 0.0015 | 0.0001 | 0.0005 |
| Manganese metal | 0.019 | - | - | 99.8 | - | - | 0.0072 | - | - | 0.036 | 0.0035 | 0.033 |
| Industrial silicon | ≤0.3 | - | - | - | - | - | 99.37 | - | ≤0.3 | - | - | - |
| Chromium nitride | 0.27 | 86.58 | 11.26 | - | - | - | 0.18 | - | 0.15 | 0.016 | 0.005 | 0.001 |
Embodiment 1
Target steel grade is 18Cr18Mn2Mo0.9N, and its Composition Control scope and smelting control targe are shown in Table 2.
2 18Cr18Mn2Mo0.9N Composition Control scope of table and control targe (wt%)
Comprise the following steps that：
(1) dispensing is determined with pressure parameter：According to target steel grade elemental composition and formula 1., formula 2., formula 3.
Obtain：Smelt pressure P1For 0.18MPa, cast pressure P2For 0.99MPa, in raw materials for metallurgy, nitrogen content is actually added into weight hundred
Divide content (wt%)1For 0.65%；The material composition shown in table 1 is combined with this prepares raw materials for metallurgy, addition 1.5kg/t electrolysis
Aluminum, for deoxidation, wherein raw materials for metallurgy includes：12044g ingot irons, 2683g crome metals, 400g metal molybdenums, 3954g metals
Manganese, 92g industrial silicons, 1154g chromium nitrides, 17.21g graphite.
(2) feed：Ingot iron, crome metal, metal molybdenum are put in crucible, by manganese metal, the work of oxidizable or volatilization
Industry silicon, chromium nitride, electrolytic aluminium, graphite are placed in feeding chamber.
(3) it is load melting：3.4Pa is evacuated to, is powered and is heated up, initial power is 6kW, progressively rises to 30kW.
(4) alloying：After raw materials for metallurgy in crucible is melting down, the high pure nitrogen for filling purity >=99.999% to pressure is
0.18MPa, then sequentially adding industrial silicon, manganese metal, chromium nitride, graphite carries out alloying, while add electrolysis aluminium deoxidation, and
Insulation 12min, wherein temperature are 1550 DEG C.
(5) cast：The high pure nitrogen for filling purity >=99.999% is pressurized to 0.99MPa, is cast；Casting is cold after terminating
But pressure release, takes out ingot casting；Wherein cast temperature is 1570 DEG C, and supercharging and casting time are 8min altogether.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition are as shown in table 3.
The chemical composition (wt%) of 3 finished steel of table
Embodiment 2
Target steel grade is 18Cr14Mn3Mo0.9N, and its Composition Control scope and smelting control targe are shown in Table 4.
4 18Cr14Mn3Mo0.9N Composition Control scope of table and control targe (wt%)
Comprise the following steps that：
(1) dispensing is determined with pressure parameter：According to target steel grade elemental composition and formula 1., formula 2., formula 3.
Obtain：Smelt pressure P1For 0.28MPa, cast pressure P2For 1.15MPa, in raw materials for metallurgy, nitrogen content is actually added into weight hundred
Divide content (wt%)1For 0.58%；The material composition shown in table 1 is combined with this prepares raw materials for metallurgy, addition 1.5kg/t electrolysis
Aluminum, for deoxidation, wherein raw materials for metallurgy includes：13285g ingot irons, 2931g crome metals, 630g metal molybdenums, 3230g metals
Manganese, 97g industrial silicons, 1082g chromium nitrides, 18.56g graphite.
(2) feed：Ingot iron, crome metal, metal molybdenum are put in crucible, by manganese metal, the work of oxidizable or volatilization
Industry silicon, chromium nitride, electrolytic aluminium, graphite are placed in feeding chamber.
(3) it is load melting：6.8Pa is evacuated to, is powered and is heated up, initial power is 5kW, progressively rises to 32kW.
(4) alloying：After raw materials for metallurgy in crucible is melting down, the high pure nitrogen for filling purity >=99.999% to pressure is
0.28MPa, then sequentially adding industrial silicon, manganese metal, chromium nitride, graphite carries out alloying, while add electrolysis aluminium deoxidation, and
Insulation 14min, wherein temperature are 1580 DEG C.
(5) cast：The high pure nitrogen for filling purity >=99.999% is pressurized to 1.15MPa, is cast；After casting terminates,
Cooling pressure release, takes out ingot casting；Wherein cast temperature is 1570 DEG C, and supercharging and casting time are 9min altogether.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition are as shown in table 5.
The chemical composition (wt%) of 5 finished steel of table
Embodiment 3
Target steel grade is 18Cr14Mn3Mo1Ni0.7N, and its chemical composition is shown in Table 6.
6 18Cr14Mn3Mo1Ni0.7N Composition Control scope of table and control targe (wt%)
Comprise the following steps that：
(1) dispensing is determined with pressure parameter：According to target steel grade elemental composition and formula 1., formula 2., formula 3.
Obtain：Smelt pressure P1For 0.16MPa, cast pressure P2For 0.92MPa, in raw materials for metallurgy, nitrogen content is actually added into weight hundred
Divide content (wt%)1For 0.48%；The material composition shown in table 1 is combined with this prepares raw materials for metallurgy, addition 1.5kg/t electrolysis
Aluminum, for deoxidation, wherein raw materials for metallurgy includes：13177g ingot irons, 3035g crome metals, 2943g manganese metals, 210g metals
Nickel, 631g metal molybdenums, 105g industrial silicons, 851g chromium nitrides, 21.02g graphite.
(2) feed：Ingot iron, crome metal, metal molybdenum, metallic nickel are put in crucible, by oxidizable or volatilization gold
Category manganese, industrial silicon, chromium nitride, electrolytic aluminium, graphite are placed in feeding chamber.
(3) it is load melting：7.8Pa is evacuated to, is powered and is heated up, initial power is 6kW, progressively rises to 28kW.
(4) alloying：After raw materials for metallurgy in crucible is melting down, the high pure nitrogen for filling purity >=99.999% to pressure is
0.16MPa, then sequentially adding industrial silicon, manganese metal, chromium nitride, graphite carries out alloying, while add electrolysis aluminium deoxidation, and
Insulation 12min, wherein temperature are 1580 DEG C.
(5) cast：The high pure nitrogen for filling purity >=99.999% is pressurized to 0.92MPa, is cast；After casting terminates,
Cooling pressure release, takes out ingot casting；Wherein cast temperature is 1570 DEG C, and supercharging and casting time are 10min altogether.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition are as shown in table 7.
The chemical composition (wt%) of 7 finished steel of table
Claims (2)
1. the method that a kind of pressurization of control by stages pressure senses smelting high nitrogen stainless steel, it is characterised in that methods described includes
Following steps：
(1) dispensing is determined with pressure parameter：According to the target component of high nitrogen stainless steel steel grade, 1. calculated by following formula and added
Smelting pressure P in pressure induction furnace1, 2. the casting pressure P in pressurization induction furnace is calculated by formula2, 3. calculated according to formula
Go out nitrogen in raw materials for metallurgy is actually added into percentage by weight (wt%)1, the raw materials for metallurgy with reference to needed for the composition of raw materials for metallurgy determines
Percentage by weight, so as to prepare raw materials for metallurgy, and add the electrolytic aluminium for deoxidation of 1.0～2.0kg/t, wherein, smelting
Refining raw material includes ingot iron, crome metal or ferrochrome, metal molybdenum or molybdenum-iron, metallic nickel, manganese metal, industrial silicon, chromium nitride and stone
Ink,
Smelt pressure P1Computing formula 1.,
Formula 1. in, P1Represent and smelt pressure, PθNormal atmosphere is represented, T represents smelting temperature, and A is calculated by following formula
Arrive,
+ 0.011 [%Ni]+3.5 × 10 of A=0.13 [%N]+0.118 [%C]+0.043 [%Si]-5[%Ni]2
- 0.024 [%Mn]+3.2 × 10-5[%Mn]2- 0.01 [%Mo]+7.9 × 10-5[%Mo]2
- 0.048 [%Cr]+3.5 × 10-4[%Cr]2
Casting pressure P2Computing formula 2.,
P2=[(0.25～0.40) P1/Pθ+ (0.15～0.65)] MPa is 2.
Formula 2. in, P2Casting pressure is represented,
In raw materials for metallurgy, nitrogen is actually added into percentage by weight (wt%)1Computing formula 3.,
Formula 3. in, (wt%)1In representing raw materials for metallurgy, nitrogen is actually added into percentage by weight, (wt%)NRepresent high nitrogen stainless steel steel
The percentage by weight of nitrogen in the target component planted；
(2) feed：Crome metal or ferrochrome, metal molybdenum or molybdenum-iron, ingot iron and metallic nickel are put into into the earthenware in pressurization induction furnace
In crucible, the manganese metal of oxidizable or volatilization, industrial silicon, chromium nitride, electrolytic aluminium and graphite are placed in feeding chamber；
(3) it is load melting：Pressure in pressurization induction furnace is evacuated to into below 10Pa, and the furnace charge being warming up in crucible that is powered
All melt；
(4) alloying：Furnace charge in the crucible of induction furnace to be pressurised fully melt reach it is melting down after, to pressurization induction furnace in fill
High pure nitrogen to the pressure for entering purity >=99.999% is P1, then by feeding chamber to pressurization induction furnace in crucible in successively
Industrial silicon, manganese metal, chromium nitride, graphite is added to carry out alloying, while add electrolysis aluminium deoxidation, and it is warm at 1530～1600 DEG C
Degree 10～15min of lower insulation；
(5) cast：High pure nitrogen to the furnace pressure for being filled with purity >=99.999% into pressurization induction furnace is P2, then carry out
Cast, after casting terminates, cool down pressure release, take out ingot casting, wherein, cast temperature is 1530～1580 DEG C, is pressurized and casting time
It is 8～15min altogether.
2. method according to claim 1, it is characterised in that the target component by weight hundred of the high nitrogen stainless steel steel grade
Point ratio is：C less than 0.2%, 12～23% Mn, 15～24% Cr, the Si less than 1%, less than 4.5%
Mo, 0.7～2% N, the Ni less than 4.5%, the Fe of surplus.
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| CN105463298B (en) * | 2015-12-01 | 2017-07-11 | 东北大学 | A kind of method that low-aluminium high nitrogen martensitic stain less steel is smelted in sensing of pressurizeing |
| CN105779688B (en) * | 2016-05-04 | 2017-12-01 | 河北钢铁股份有限公司 | A kind of method that vacuum induction furnace smelting nitrogenous steel accurately controls nitrogen content |
| CN105970074B (en) * | 2016-05-30 | 2017-12-01 | 河北钢铁股份有限公司 | A kind of method that vaccum sensitive stove quickly smelts low nitrogen stainless steel |
| CN106011371B (en) * | 2016-06-24 | 2018-06-22 | 东北大学 | A kind of method of pressurize sensing and pressurization electroslag remelting duplex smelting high-nitrogen steel |
| CN106636858B (en) * | 2016-10-24 | 2018-05-15 | 江苏星火特钢有限公司 | A kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel |
| CN106513619B (en) * | 2016-12-02 | 2018-05-08 | 机械科学研究总院青岛分院有限公司 | The technique of centrifugal casting high-nitrogen austenitic stainless steel steel pipe under a kind of normal pressure |
| CN111840659B (en) * | 2020-04-30 | 2022-02-08 | 中科益安医疗科技（北京）股份有限公司 | High-safety blood vessel support without nickel metal medicine elution and its making method |
| CN111850422B (en) * | 2020-04-30 | 2022-01-11 | 中科益安医疗科技（北京）股份有限公司 | High-nitrogen nickel-free austenitic stainless steel seamless thin-walled tube and preparation method thereof |
| CN112281049A (en) * | 2020-11-23 | 2021-01-29 | 浙江宝武钢铁有限公司 | Preparation method of non-magnetic high-nitrogen stainless steel |
| CN112695151B (en) * | 2020-12-18 | 2022-01-25 | 东北大学 | Method for obtaining solidification pressure required by preparing high-nitrogen austenitic stainless steel through pressure induction and preparation method |
| CN112733465B (en) * | 2020-12-18 | 2023-06-02 | 东北大学 | Method for acquiring solidification pressure required by pressurizing electroslag remelting high-nitrogen austenitic stainless steel and preparation method |
| CN113388709B (en) * | 2021-06-11 | 2022-02-15 | 东北大学 | Method for accurately controlling nitrogen content in high-nitrogen stainless steel |
| CN116024398A (en) * | 2023-02-24 | 2023-04-28 | 东北大学 | Determination method for minimum value of solidification pressure for inhibiting nitrogen pores, application of determination method and preparation method of high-nitrogen stainless steel cast ingot |
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| CN101260478B (en) * | 2008-04-17 | 2010-06-16 | 东北大学 | Method for smelting high-nitrogen steel by compression electroslag furnace |
| CN102002640B (en) * | 2010-09-09 | 2012-08-08 | 中国兵器工业第五二研究所 | Method for preparing high nitrogen steel by adopting pressurized induction |
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