CN105772909A - Method for 3D printing of high-nitrogen steel product through nitrogen arc and nitrides - Google Patents
Method for 3D printing of high-nitrogen steel product through nitrogen arc and nitrides Download PDFInfo
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- CN105772909A CN105772909A CN201610008872.1A CN201610008872A CN105772909A CN 105772909 A CN105772909 A CN 105772909A CN 201610008872 A CN201610008872 A CN 201610008872A CN 105772909 A CN105772909 A CN 105772909A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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Abstract
The invention provides a device for 3D printing of a high-nitrogen steel product through nitrogen arc and nitrides and a method thereof. Surfacing forming of high-nitrogen steel with set layers is achieved at the ordinary pressure through a nitrogen arc wire feeding additive manufacturing method, and nitride alloy powder is added into a molten pool through nitrogen powder feeding. Spiral gas powder grooves are bored in the inner wall of a coaxial spiral gas powder cover. The nitride alloy powder forms rotary gas powder flow at a welding gun muzzle, the loss caused by scattering when the nitride alloy powder flows out of the gun muzzle is reduced, and the effect that the nitride alloy powder and molten drops at the ends of welding wires are fully and metallurgically smelted and then enter the molten pool is ensured. By controlling parameter matching of 3D printing, high-nitrogen steel printing layers with different nitrogen contents can be obtained. The mode of nitride alloy powder and welding wire synchronous coaxial power adding and wire feeding is adopted, and 3D printing of the high-nitrogen steel product at the ordinary pressure is achieved through a common steel welding wire-nitride alloy powder-nitrogen arc composite technology.
Description
Technical field
The invention belongs to Rapid Prototyping technique field, be specifically related to one and utilize nitrogen arc and nitride 3D to print high nitrogen steel system
The device and method of product, it is adaptable to the increasing material of high nitrogen steel material manufactures, welds and part reparation.
Background technology
Interstitial element nitrogen in high nitrogen steel and other alloying elements (Mn, Cr, Mo, V, Nb and Ti etc.) coordinative role, can change
The kind intensity of steel, toughness, creep resistance, anti-wear performance, decay resistance etc..But nitrogen under atmospheric pressure nitrogen solubility is very
Low, add highly difficult, owing to addition is few, its Beneficial Effect is less obvious, and the universal mode of production of high nitrogen steel is that pressurization is smelted,
Needing special production equipment, yield is limited and cost is high.It addition, the processing characteristics of high nitrogen steel deteriorates, processing sclerotic conditions is tight
Weight, requires strict to design, quality and the process parameter control of process tool.Two aspect factors combine and make answering of high nitrogen steel
With being restricted.
Electric arc 3D printing technique, i.e. electric arc wire feeding increase material manufacturing technology, are to utilize arc surfacing principle to be melted by metal wire material
Change, the most directly manufacture the process of theoretical density 3-dimensional metal part.With foundry engieering and machining
The traditional methods such as method are compared, and electric arc wire feeding increases the operation simplification of material manufacturing technology, stock utilization improves, production cost fall
Low, mechanical processing difficulty is low, can control the gross imperfection in part and component segregation simultaneously, subsequent processing operations simplifies,
It is applicable to novel product rapid development and batch production.
Existing electric arc 3D printing technique generally comprises: coaxial or paraxonic wire feed electric arc 3D prints and powder feeding electric arc 3D beats
Print, does not has a powder coaxially to add, and when adding powder, powder can not rotate.Laser 3D printing technique has and uses silk powder to synchronize feeding
Mode, but it is not carried out a powder and is coaxially sent into, and the uniformity of composition of weld line is bad.
Chinese patent (200710141482.2) discloses a kind of cladding apparatus based on argon arc welding, and it uses coaxially
Automatic powder feeding system, the dilution rate of the cladding layer obtained is high, the most about 5%～10%, and its cladding layer area is big, for 3D marker
During skill, then can not realize printing the accurate control of product size.Chinese patent (201210250419.3) discloses a kind of high nitrogen
The double-layer air-flow protection TIG weld method of steel, which employs double-deck nitrogen and protects, but its nitrogen pick-up weak effect, and can not wire feed
Add powder.Chinese patent (94240533.1) discloses a kind of gas rotation type paint spray pistol, and the inner surface boring of its trachea has screw thread
Spin line, makes vaporific paint form orientation so that it is scattering surface diminishes, but utility model patent is at tubular structure inwall actually
Boring screw thread spin line, it is poor to the flow direction restriction effect of gas powder stream.
Summary of the invention
It is an object of the invention to provide a kind of method utilizing nitrogen arc and nitride 3D to print high nitrogen steel goods,
The technical scheme of a kind of method utilizing nitrogen arc and nitride 3D to print high nitrogen steel goods of the present invention is:
A kind of device using nitrogen arc and nitride in-situ metallurgy to realize the nitrogen pick-up of steel surface, it specifically includes that
One electrode gas shielded arc welding gun；
It is provided with in the one coaxial transporter of gas powder with electrode gas shielded arc welding gun with axial screw gas powder cover, coaxial spiral
Have, in gas powder cover, the screw thread being fastenedly connected with electrode gas shielded arc welding gun；The coaxial transporter of gas powder is interior, spiral gas powder cover
It is externally provided with the powder feeding plenum duct tangent with spiral gas powder cover outer wall；Powder feeding plenum duct has air taking port and powder feeding mouth；
The inwall of described spiral gas powder cover has spiral gas powder groove；
Spiral gas powder groove as above is at spiral gas powder cover, and its structure can be to become helical-varying pitch-variable cross-section knot
Structure, described spiral gas powder groove is half slot, a diameter of 2mm～7mm of groove, and from top, Gradient reduces；Lead angle at 0 °～
From top, Gradient reduces in 60 ° of intervals, and described spiral gas powder cover uses heat proof material SiC ceramic to manufacture.
It is respectively provided with powder feeding speed regulator and gas flowmeter on powder feeding mouth as above and air taking port.
The gas powder of spiral gas powder cover as above exports in necking down shape, and the extended line in necking down face points to arc center.
Electrode gas shielded arc welding gun nozzle heat proof material SiC ceramic as above manufactures, described consumable electrode gas
Body protection welding gun, the reach of its outer upper processing is at least the twice of its diameter.
A kind of method utilizing nitrogen arc and nitride 3D to print high nitrogen steel goods, its method concrete steps are such as
Under:
Step 1, by the subject alloy composition of target high nitrogen steel goods, determines iron content WFe%；Select mild steel
Welding wire is as wire feed raw material；
According to the subject alloy composition of target high nitrogen steel goods, determine in the alloy powder being required as powder feeding raw material and close
The content Wif% ratio of gold element i, is corrected relational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ) obtains alloy in powder after revising
Correction value Wif of element i contentRevise%；Wherein μ i is scaling loss coefficient, and μ i=0.2%～5%, ξ are scattering spatter loss coefficient,
ξ=2%～8%；Alloying element in the alloy powder of powder feeding raw material is not ferrum；
Step 2, according to the relational expression of the content Wi% of alloying element i in target high nitrogen steel Yu iron contentObtain all alloying elements composition with ferrum element than α: β, determine that the powder feeding sending into molten bath is former
The quality of material and mass ratio α: β of wire feed raw material, if material powder quality m entered in molten bathPowder=Vf × Δ t, enters molten bath
The quality of wire feed raw materialWherein Vf is for adding powder speed, and unit is g/min；Vs is wire feed rate,
Unit is m/min；D is gage of wire, and unit is m；ρ is welding wire density, and unit is g/m3；Δ t is the time, and unit is min；
Step 3, according to formulaDetermine powder feeding rate Vf with
Wire feed rate Vs parameter matching relationship,Formula Vf:(K × Vs must be simplified)
=α: β；
Step 4, chooses wire feed and send rate Vs to be 1.5m/min～12m/min；According to formula Vf:(K × Vs)=α: β, draw
Powder feeding rate Vf；
Step 5, starts nitrogen arc and the device of nitride 3D printing high nitrogen steel goods, regulates on the coaxial transporter of gas powder
Powder feeding rate is Vf, speed of supplying gas is VGas 1, the wire feed rate of regulation electrode gas shielded arc welding gun is Vs, and protection gas speed is
VGas 2, weld；
Step 6, determines 3D print path according to target high nitrogen steel article shape size, carries out built-up welding with bonding speed v, often
When one layer stack is soldered, welding gun being improved a thickness, repeated overlaying weldability process finally obtains high nitrogen steel goods.
Preferably, speed V of supplying gas on the coaxial transporter of gas powderGas 1Gas speed V is protected with welding gunGas 2Meet VGas 1≈VGas 2
=15～40L/min.
Preferably, bonding speed v is 3～16mm/s.
The present invention compared with prior art has a following remarkable advantage:
(1) use the nitride alloy powder mode that coaxially add powder wire feed Tong Bu with welding wire, it is achieved that at ambient pressure gas-
Powder-silk three synchronizes coaxial electric arc 3D and prints high nitrogen steel；
(2) the nitride alloy powder added can be at welding gun interruption-forming rotary pneumatic powder stream, beneficially nitride alloy powder
Metallurgical smelting abundant with the molten drop of welding wire end and molten bath, ensures that nitride alloy powder is accurately delivered in molten bath simultaneously, and subtracts
Few scattering and the loss brought of splashing, the high nitrogen steel product composition of gained is uniform；
(3) by regulating the alloying component of nitride alloy powder and adding the parameter coupling of powder wire feed, can print with 3D
The high nitrogen steel goods of different nitrogen contents；
(4) nitrogen arc and the nitrogen coordinative role of transmission nitride alloy powder, contribute to the raising of nitrogen partial pressure, effectively control
Having fused into the effusion of nitrogen in molten bath, nitrogen pick-up effect increase rate is big；
(5) compared with directly printing high nitrogen steel method with high nitrogen steel powder 3D, the ordinary steel welding wire used by the present invention adds suitable
The nitride alloy powder 3D method that prints high nitrogen steel goods of amount, it is to avoid high nitrogen steel is processed into the problem that powder is difficult,
Technique simplifies, cost reduces.
Accompanying drawing explanation
Fig. 1 for utilizing nitrogen arc and nitride 3D to print high nitrogen steel article device structural representation,
Fig. 2 is the longitudinal sectional view of coaxial gas powder cover；
Fig. 3 is the Section A-A sectional view utilizing nitrogen arc and nitride 3D to print high nitrogen steel article device.
Wherein, 1 is plenum duct, and 2 is powder feeding passage, and 3 is spiral gas powder cover, and 4 is spiral gas powder groove, and 5 is consumable electrode gas
Body protection welding gun.
Detailed description of the invention
Nitrogen arc and nitride 3D is utilized to print high nitrogen one of the present invention with specific embodiment below in conjunction with the accompanying drawings
The devices and methods therefor of steel part is further described.
A kind of device utilizing nitrogen arc and nitride 3D to print high nitrogen steel goods, this device includes a consumable electrode gas-arc
Welding gun 5；
The one coaxial transporter of gas powder, is provided with in it with electrode gas shielded arc welding gun 5 with axial screw gas powder cover 3, spiral shell
Have, in rotation gas powder cover 3, the screw thread being fastenedly connected with electrode gas shielded arc welding gun 5；
The coaxial transporter of gas powder is interior, spiral gas powder cover 3 is externally provided with the powder feeding tangent with spiral gas powder cover 3 outer wall and supplies gas logical
Road；
Powder feeding plenum duct has air taking port 1 and powder feeding mouth 2；
The inwall of spiral gas powder cover 3 has spiral gas powder groove 4.
The structure of spiral gas powder groove 4 is for becoming helical-varying pitch-variable section structure, and described spiral gas powder groove 4 is semicircle
Groove, a diameter of 2mm～7mm of groove, from top, Gradient reduces；In 0 °～60 ° of intervals, from top, Gradient reduces lead angle, institute
The spiral gas powder groove 4 stated uses heat proof material SiC ceramic manufacture.
It is respectively provided with powder feeding speed regulator and gas flowmeter on powder feeding mouth 1 and air taking port 2.
The gas powder of described spiral gas powder cover 3 exports in necking down shape, and the extended line in necking down face points to arc center.
Described electrode gas shielded arc welding gun 5 heat proof material SiC ceramic manufactures, described gas metal-arc welding
The reach of rifle 5 outer wall processing is at least the twice of its diameter.
The method that the present invention uses nitrogen arc wire feed to increase material manufacture is set the built-up welding of layer high nitrogen steel and shapes, and utilizes nitrogen simultaneously
Pneumatic transmission powder adds nitride alloy powder in molten bath.The parameter printed by controlling 3D is mated, and can obtain different nitrogen contents
High nitrogen steel printable layer.When every layer stack is soldered into, welding gun improves a thickness, and repeated overlaying weldability obtains high nitrogen steel goods.Use nitridation
The thing alloy powder mode that coaxially add powder wire feed Tong Bu with ordinary steel welding wire, it is achieved utilize ordinary steel welding wire-nitridation at ambient pressure
Thing alloy powder-nitrogen arc complex technique 3D prints high nitrogen steel goods.
Nitrogen pick-up principle is, on the one hand, filling silk material and burn in nitrogen arc and melt, form molten drop, the nitrogen in nitrogen arc enters
Molten drop, causes nitrogen content in molten drop to increase, and in nitrogen arc, nitrogen partial pressure is higher simultaneously, can control molten bath and fuse into the effusion of nitrogen；Separately
On the one hand, nitride alloy powder fuses into molten drop after heating in nitrogen arc, further increases the nitrogen content of molten drop.Nitride closes
Bronze end is denitrogenated outside compound, is also equipped with other alloying elements, such as elements such as Mn, Cr, Mo, to guarantee that nitrogen is solid-solubilized in atomic form
In high nitrogen steel.
Embodiment 1
Utilizing said apparatus, the method using nitrogen arc and nitride 3D to print high nitrogen steel goods prepares high nitrogen steel component, its
A size of 100mm × 100mm × 40mm, is made up of 20 layer stack layers, and every floor height is 2mm, and every layer of weld seam is made up of 7 road weld seams.
Using the method utilizing nitrogen arc and nitride 3D to print high nitrogen steel goods of the present invention, it concretely comprises the following steps:
Step 1, by the subject alloy composition of target high nitrogen steel goods, determines iron content WFe%；Select mild steel
Welding wire is as wire feed raw material；
According to the subject alloy composition of target high nitrogen steel goods, determine the nitride alloy powder being required as powder feeding raw material
In end, the content Wif% ratio of alloying element i, is corrected relational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ) obtains powder after revising
Correction value Wif of middle alloying element [i] contentRevise%, and prepare nitride alloy powder；Wherein μ i is scaling loss coefficient, μ i=
0.2%～5%, ξ are scattering spatter loss coefficient, ξ=2%～8%；
Nitride alloy powder stock includes: chromium nitride powder, nitrogenized manganese powder, chromium powder, manganese powder, molybdenum powder.Target
The component requirements of high nitrogen steel is as shown in table 1.Selecting H08Mn2Si welding wire, its chemical composition requires as shown in table 2.
When powder presses CrN:MnN:Cr:Mn:Mo=4:4:18.85:11.8:1.5, meet target product alloying element
Divide content ratio.According to revising relational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ), correction obtains the formula of material powder and is: CrN:
During MnN:Cr:Mn:Mo=4:4:19:12:1.5, with steel welding wire with the use of printing high nitrogen steel goods, and high nitrogen steel system
The composition of product is N:1.66%, Mn:15%, Cr:22%, Mo:1.5%, and surplus is ferrum.
The chemical composition of table 1 target high nitrogen steel requires (%)
| Chemical composition | N | Mn | Cr | Mo | Si | C | Fe |
| Standard criterion | 0.8-2.4 | 12-18 | 18-23 | 1.0-2.5 | ≤1 | ≤0.1 | Surplus |
Table 2 H08Mn2SiA welding wire chemical composition (%)
Step 2, according to content Wi% and the pass of iron content of target high nitrogen steel alloying element i in addition to ferrum element
It it is formulaObtain all alloying elements composition with ferrum element than α: β ≈ 2:3, determine feeding molten bath
The mass ratio of alloy powder quality and welding wire be 2:3, enter the powder quality m in molten bathPowder=Vf × Δ t, enters molten bath
Quality of Final Welding WireWherein Vf is for adding powder speed, and unit is g/min；Vs is wire feed rate, and unit is m/
min；D is gage of wire, and unit is m；ρ is welding wire density, and unit is g/m3；Δ t is the time, and unit is min.
Step 3, according to formulaDetermine powder feeding rate Vf with
Wire feed rate Vs parameter matching relationship,Formula Vf:(K × Vs must be simplified)
=α: β；Density p=the 7.85g/cm of welding wire3, diameter d=1.6mm, substitute into and calculate K=15.78g/m.
Step 4, choosing wire feed rate Vs is 5m/min；Again by formula Vf:(K × Vs)=α: β, draw powder feeding rate Vf
=52.6g/min；
Step 5, starts nitrogen arc and the device of nitride 3D printing high nitrogen steel goods, regulates on the coaxial transporter of gas powder
Powder feeding rate is Vf, send nitrogen rate to be VGas 1, set the wire feed rate of electrode gas shielded arc welding gun as Vs, regulation consumable electrode
The protection gas speed of gas protective welding gun is VGas 2, at two, the speed of supplying gas of gas is 10L/min～20L/min.Nitride closes
Bronze end with 100% nitrogen transmission.Nitrogen arc is the electric arc under nitrogen atmosphere, and wherein nitrogen ginseng has the Ar of 5%～10%, with really
Protecting electric arc can striking and stable burning smoothly.And weld；
According to target high nitrogen steel article shape size, step 6, determines that 3D print path, bonding speed v take 58.3cm/min.
Carry out built-up welding, when each layer stack is soldered, welding gun is improved a thickness, repeated overlaying weldability process, is finally folded by 20 floor height nitrogen steel layer
Add formation high nitrogen steel goods.When high nitrogen steel 3D printing goods complete to terminate welding, need to first stop wire feed and add powder, stop the most again
Supply gas, to prevent dust explosion.
Claims (7)
1. one kind utilizes the method that nitrogen arc and nitride 3D print high nitrogen steel goods, it is characterised in that comprise the following steps that
Step 1, according to the alloying component of target high nitrogen steel goods, obtains the alloying element i composition with ferrum element than α: β, determines
Send into the quality of the powder feeding raw material in molten bath and the mass ratio of wire feed raw material；
Step 2, according to the mass ratio of quality and the wire feed raw material of the powder feeding raw material sending into molten bathDetermine powder feeding rate Vf and wire feed rate Vs parameter matching relationship；
Wherein, Vf is powder feeding rate, and unit is g/min；Vs is wire feed rate, and unit is m/min；D is gage of wire, and unit is m；ρ
For welding wire density, unit is g/m3；Δ t is the time, and unit is min；mPowderFor sending into the quality of the powder feeding raw material in molten bath, mSilkFor entering
Enter the quality of the wire feed raw material in molten bath；
Step 3, chooses wire feed and send rate Vs to be 1.5m/min～12m/min, draw powder feeding rate Vf；
Step 4, starts nitrogen arc and the device of nitride 3D printing high nitrogen steel goods, regulates powder feeding on the coaxial transporter of gas powder
The powder feeding rate Vf of mouth, speed V of supplying gas of air taking portGas 1, the wire feed rate Vs of regulation electrode gas shielded arc welding gun, protection gas
Speed VGas 2, weld；
Step 5, determines 3D print path according to target high nitrogen steel article shape size, carries out built-up welding, each layer with bonding speed v
When heap is soldered, welding gun being improved a thickness, repeated overlaying weldability process finally obtains high nitrogen steel goods.
The method that nitrogen arc the most according to claim 1 and nitride 3D print high nitrogen steel goods, it is characterised in that described
Speed V of supplying gas on the coaxial transporter of gas powderGas 1Gas speed V is protected with welding gunGas 2Meet VGas 1≈VGas 2=15～40L/min.
The method that nitrogen arc the most according to claim 1 and nitride 3D print high nitrogen steel goods, it is characterised in that described
Bonding speed v is 3～16mm/s.
The method that nitrogen arc the most according to claim 1 and nitride 3D print high nitrogen steel goods, it is characterised in that step 1
In, select mild steel weldinmg rod as wire feed raw material.
The method that nitrogen arc the most according to claim 1 and nitride 3D print high nitrogen steel goods, it is characterised in that step 1
In, described powder feeding raw material, determine according to the content Wif% ratio of alloying element i in addition to ferrum in target high nitrogen steel goods.
The method that nitrogen arc the most according to claim 5 and nitride 3D print high nitrogen steel goods, it is characterised in that described
The content Wif% of alloying element i, is corrected relational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ) revises；Wherein WifRevise% is for repairing
On the occasion of, μ i is scaling loss coefficient, μ i=0.2%～5%, ξ are scattering spatter loss coefficient, ξ=2%～8%.
The method that nitrogen arc the most according to claim 1 and nitride 3D print high nitrogen steel goods, it is characterised in that described
Alloying element i does not contains ferrum element.
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| CN110587078A (en) * | 2019-08-15 | 2019-12-20 | 南京理工大学 | Nitrogen fixation device and method in multi-element activated nitrogen arc welding process |
| CN110560842A (en) * | 2019-08-26 | 2019-12-13 | 南京理工大学 | nitrogen fixation device and method in welding based on paraxial wire feeding |
| CN110560842B (en) * | 2019-08-26 | 2022-03-22 | 南京理工大学 | Nitrogen fixation device and method in welding based on paraxial wire feeding |
| CN112404668A (en) * | 2020-10-29 | 2021-02-26 | 南京理工大学 | Powder feeding electric arc additive device and method for high-nitrogen steel |
| WO2022211728A1 (en) * | 2021-03-30 | 2022-10-06 | Agency For Science, Technology And Research | Method for fabricating a nitrogenous steel material |
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