CN107598171A - A kind of desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method - Google Patents
A kind of desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method Download PDFInfo
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- CN107598171A CN107598171A CN201710702714.0A CN201710702714A CN107598171A CN 107598171 A CN107598171 A CN 107598171A CN 201710702714 A CN201710702714 A CN 201710702714A CN 107598171 A CN107598171 A CN 107598171A
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Abstract
The invention provides a kind of desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method, belong to metal material field, the complicated shape desalinization conduit coupling high nitrogen biphase stainless steel with excellent mechanical property, decay resistance is prepared using PREP nitriding power injection molding near-net-shape.Desalinization conduit coupling high nitrogen biphase stainless steel N content >=0.5%, C content≤0.03% prepared, tensile strength Rm>=950MPa, yield strength Rp0.2>=770MPa, elongation A >=15%, contraction percentage of area Z >=25%, Rockwell hardness≤36HRC, room temperature impact absorb work(>=90J, critical pitting temperature CPT >=80 DEG C.
Description
Technical field
The invention belongs to metal material field, invents a kind of desalinization conduit coupling high nitrogen biphase stainless steel near net
Manufacturing process.
Background technology
The branch of reverse osmosis seawater desalting pressure duct and tie point will bear 6~8MPa pressure, it is easy to stitch
Gap is corroded, and currently used stainless steel material is difficult to meet to require, in addition, the generally use when preparing such connector at present
The method of welding, the crevice corrosion degree of connector also it has been further exacerbated by.Therefore need at the position using corrosion-resistant, simultaneously
Stainless steel material with excellent mechanical performance, while preparation method is improved, inclining for crevice corrosion occurs to reduce pipe joint
To.
High nitrogen dual phase steel by stainless steel add 0.3~0.6% nitrogen come further improve its decay resistance and
Mechanical property.In the prior art, preparing the method for high nitrogen stainless steel mainly has nitrogen pressurization smelting process, Counter pressure casting method, powder
Metallurgy method.There is equipment complexity in nitrogen pressurization smelting process, Keep Clear-High Voltage, technology controlling and process is difficult, structural homogenity is poor, production cost
The shortcomings of high；The Counter pressure casting method gas pressure required in solidification is too big, and the steel ingot tonnage that can be manufactured is limited；Powder injection
Shaping can be used for near-net forming to prepare the desalinization pipeline complicated shape metal connector that casting forging method is difficult to manufacture, still
Powder metallurgy high nitrogen biphase stainless steel is prepared to first have to obtain high nitrogen stainless steel powder, at present, the preparation of high nitrogen stainless steel powder
Method mainly has mechanical alloying method, nitrogen atomization method, is all difficult to control there is nitrogen content in powder, oxygen content and impurity contain
Measure the problem of high.
The content of the invention
In view of this, it is an object of the invention to provide a kind of desalinization conduit coupling high nitrogen biphase stainless steel material
Material and near-net-shape method, by increasing the nitrogen content in high nitrogen biphase stainless steel, oxygen content is reduced, improves high nitrogen two-phase stainless
The mechanical property and decay resistance of steel.
In order to realize foregoing invention purpose, the present invention provides following technical scheme：A kind of desalinization conduit coupling is used
High nitrogen biphase stainless steel near-net-shape method, comprises the following steps：
(1) according to element mass percent 26~33%Cr, 3~5%Mo, 5.5~9.5%Ni, 0.5~1.5%Cu, 0
~1.0%Co, C≤0.03%, Mn≤1.5%, P≤0.035%, S≤0.01%, Si≤0.5%, O≤0.006%, surplus
Fe carry out dispensing, it is smelting successively and forging, obtain stainless steel electrode rod；
(2) the stainless steel electrode rod for obtaining the step (1) carries out PREP nitriding powder, obtains
High nitrogen biphase stainless steel powder；
(3) the high nitrogen biphase stainless steel powder for obtaining the step (2) is kneaded with binding agent, obtains being kneaded material；
(4) injection moulding after the mixing material granulation for obtaining the step (3), obtain shaping sample；
(5) the shaping sample degreasing for obtaining the step (4), obtains degreasing blank；
(6) degreasing blank that the step (5) obtains is sintered nitriding, obtains sintered specimen；
(7) sintered specimen that the step (6) obtains is dissolved, it is double with high nitrogen obtains desalinization conduit coupling
Phase stainless steel.
Preferably, in the step (2), the condition of PREP nitriding powder includes：Vacuum be 1 ×
10-3~10 × 10-3Pa, nitrogen pressure are 0.1 × 105~3 × 105Pa, the mass percent of oxygen are less than 0.01%.
Preferably, the plasma arc power of the PREP nitriding powder is 100~400kW.
Preferably, during the PREP nitriding powder, the rotating speed of stainless steel electrode rod for 18000~
30000 revs/min, the amount of feeding of the stainless steel electrode rod is 1~10 mm/second.
Preferably, binding agent includes the component of following mass percent in the step (3)：65~75% paraffin, 23
~30% high density polyethylene (HDPE), 2~5% stearic acid.
Preferably, the temperature of injection moulding is 150~170 DEG C in the step (4), and the pressure of the injection moulding is
100~120MPa.
Preferably, degreasing includes solvent degreasing and thermal debinding successively in the step (5)；
The temperature of the solvent degreasing degreasing solvent is 20~40 DEG C, and the time of the solvent degreasing is 2~4h.
Preferably, the thermal debinding in step (5) takes off including first paragraph thermal debinding, second segment thermal debinding, the 3rd section of heat successively
Fat, the 4th section of thermal debinding and the 5th section of thermal debinding；
The first paragraph thermal debinding be room temperature to 200~220 DEG C progress first paragraph insulations, be warming up to the first paragraph
The time of thermal debinding is 140~160min, and the time of the first paragraph insulation is 50~70min；
The second segment thermal debinding is 200~220 DEG C and is warming up to 300~320 DEG C of progress second segment insulations, is warming up to described
The heating-up time of second segment thermal debinding is 190~210min, and the time of the second segment insulation is 50~70min；
The 3rd section of thermal debinding is 300~320 DEG C and is warming up to the 3rd section of insulation of 415~435 DEG C of progress, is warming up to described
The time of 3rd section of thermal debinding is 105~125min, and the time of the 3rd section of insulation is 50~70min；
The 4th section of thermal debinding is 415~435 DEG C and is warming up to the 4th section of insulation of 490~510 DEG C of progress, is warming up to described
The time of 4th section of thermal debinding is 65~85min, and the time of the 4th section of insulation is 50~70min；
The 5th section of thermal debinding is 490~510 DEG C and is warming up to the 5th section of insulation of 700~900 DEG C of progress, is warming up to described
The time of 5th section of thermal debinding is 50~70min, and the time of the 5th section of insulation is 20~30min.
Preferably, the temperature of sintering nitriding is 1250~1350 DEG C in the step (6), and the time of the sintering nitriding is
2~4 hours.
Preferably, the temperature of solid solution is 1040~1200 DEG C in the step (7), and the time of the solid solution is small for 1~2
When.
The invention provides a kind of desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method, using etc.
The rotating electrode atomized nitriding of ion-power injection molding is prepared with excellent mechanical property, the complexity of decay resistance
The nearly end form high nitrogen biphase stainless steel of shape.PREP nitriding can improve high nitrogen two-phase not in atomization process
The nitrogen content for powdered steel of becoming rusty, produce good fluidity, nitrogen content height, the high nitrogen that oxygen content is extremely low, particle diameter is tiny, sphericity is excellent
Two phase stainless steel spherical powder；Powder injection forming can improve the uniform texture of high nitrogen biphase stainless steel, be applied to
Prepare the nearly end form high nitrogen biphase stainless steel of complicated shape.The desalinization conduit coupling that the present invention prepares with high nitrogen two-phase not
Become rusty powdered steel good sphericity, impurity content is low, solves granularity and the controllable high nitrogen biphase stainless steel high-cleanness, high powder of N content
Technology of preparing bottleneck, the accuracy controlling of powder injection forming high nitrogen biphase stainless steel α/γ duplex structures and performance is realized, makes tool
There are excellent decay resistance and the complicated shape high nitrogen biphase stainless steel conduit coupling of mechanical property to be equipped in desalinization
In applied.The as shown by data of embodiment, high nitrogen biphase stainless steel N content >=0.5% produced by the present invention, C content≤
0.03%, tensile strength Rm>=950MPa, yield strength Rp0.2>=770MPa, elongation A >=15%, contraction percentage of area Z >=
25%, Rockwell hardness≤36HRC, room temperature impact absorbs work(>=90J, critical pitting temperature CPT >=80 DEG C, mechanical property and corrosion resistant
Corrosion can exceed that the level of forge piece.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method flow chart of the present invention；
Fig. 2 is the scanning of desalinization conduit coupling high nitrogen biphase stainless steel powder made from the embodiment of the present invention 1
Electronic Speculum spectrogram；
Fig. 3 is the XRD spectra of desalinization conduit coupling high nitrogen biphase stainless steel made from the embodiment of the present invention 1；
Fig. 4 is the microscopic structure of desalinization conduit coupling high nitrogen biphase stainless steel made from the embodiment of the present invention 1
Spectrogram；
Fig. 5 is the three-way piece made from the desalinization conduit coupling high nitrogen biphase stainless steel of the embodiment of the present invention 1
Structure chart.
Embodiment
The invention provides a kind of desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method, including with
Lower step：
(1) according to element mass percent 26~33%Cr, 3~5%Mo, 5.5~9.5%Ni, 0.5~1.5%Cu, 0
~1.0%Co, C≤0.03%, Mn≤1.5%, P≤0.035%, S≤0.01%, Si≤0.5%, O≤0.006%, surplus
Fe carry out dispensing, it is smelting successively and forging, obtain stainless steel electrode rod；
(2) the stainless steel electrode rod for obtaining the step (1) carries out PREP nitriding powder, obtains
High nitrogen biphase stainless steel powder；
(3) the high nitrogen biphase stainless steel powder for obtaining the step (2) is kneaded with binding agent, obtains being kneaded material；
(4) injection moulding after the mixing material granulation for obtaining the step (3), obtain shaping sample；
(5) the shaping sample degreasing for obtaining the step (4), obtains degreasing blank；
(6) degreasing blank that the step (5) obtains is sintered nitriding, obtains sintered specimen；
(7) sintered specimen that the step (6) obtains is dissolved, it is double with high nitrogen obtains desalinization conduit coupling
Phase stainless steel.
The present invention is according to element mass percent 26~33%Cr, 3~5%Mo, 5.5~9.5%Ni, 0.5~1.5%
Cu, 0~1.0%Co, C≤0.03%, Mn≤1.5%, P≤0.035%, S≤0.01%, Si≤0.5%, O≤0.006%,
The Fe of surplus carries out dispensing, smelting successively and forging, obtains stainless steel electrode rod.
The present invention preferably according to element mass percent 29~32%Cr, 3.5~4%Mo, 7~8%Ni, 1%Cu,
1.0%Co, C≤0.03%, Mn≤1.5%, P≤0.035%, S≤0.01%, Si≤0.5%, O≤0.006%, surplus
Fe carries out dispensing, smelting successively and forging, obtains stainless steel electrode rod.
The present invention does not have any special limitation to described Cr, Mo, Ni, Cu, Co, C, Mn, P, S, O and Fe source, adopts
With rule of origin well known to those skilled in the art or commercial goods, specifically, such as pure iron, fine copper, pure molybdenum, pure nickel, pure
Cobalt etc..
It is any special that the present invention does not have to technological parameters such as the addition sequence of each raw material, the temperature of melting, times
Limit, using well known to those skilled in the art raw material can be made well mixed, in embodiments of the present invention preferred basis
Raw material melting is obtained uniform liquid smelted product by the species of raw material.
After the completion of melting, the present invention is forged smelted product to obtain stainless steel electrode rod.In the present invention, the forging
The temperature made is preferably 1150~1300 DEG C, more preferably 1200~1250 DEG C；The present invention was not limited the time of the forging
It is fixed, the stainless steel electrode rod of the requirement can be obtained.The present invention obtains consistency more than 99% by forging, without obvious
The stainless steel electrode rod of the casting flaws such as loose, shrinkage cavity.In the present invention, the diameter of the stainless steel electrode rod be preferably 60~
75mm, more preferably 65~70mm；The length of the stainless steel electrode rod is preferably 500~700mm, more preferably 550~
650mm；The surface roughness Ra of the stainless steel electrode rod is preferably not greater than 3 μm, more preferably 1~1.5 μm.
After obtaining stainless steel electrode rod, the stainless steel electrode rod is carried out PREP nitriding by the present invention
Powder processed, obtains high nitrogen biphase stainless steel powder, in the high nitrogen biphase stainless steel powder nitrogen mass content be preferably 0.5~
1.0%, more preferably 0.5~0.7%.In the present invention, the PREP nitriding can produce good fluidity,
N content is high, the high nitrogen biphase stainless steel powder that O content is extremely low, particle diameter is tiny, sphericity is excellent.
In the present invention, the condition of the PREP nitriding powder includes：Vacuum is preferably 1 ×
10-3~10 × 10-3Pa, more preferably 1 × 10-3~3 × 10-3Pa；Nitrogen pressure is preferably 0.1 × 105~3 × 105Pa, more
Preferably 2 × 105~3 × 105Pa；The mass percent of oxygen is preferably less than 0.01%.In the present invention, the plasma rotation
The plasma arc power for turning electrode atomized nitriding powder is preferably 100~400kW, more preferably 200~300kW.
In the present invention, the rotating speed of stainless steel electrode rod is preferably during the PREP nitriding powder
18000~30000 revs/min, more preferably 25000~30000 revs/min；The amount of feeding of the stainless steel electrode rod is preferably 1~
10 mm/seconds, more preferably 3~7 mm/seconds.
The present invention does not have special restriction to the equipment of the PREP nitriding powder, using this area
Known to technical staff, commercially available PREP powder manufacturing apparatus, preferably use Russia in embodiments of the present invention
Ross equipment, rotating speed can reach 30000 revs/min, can produce D50The fine powder that 30 μm of ＜.
In the present invention, the mean particle size D of the high nitrogen biphase stainless steel powder50Preferably 15~65 μm, more preferably
15~40 μm, most preferably 20~30 μm.
After obtaining high nitrogen biphase stainless steel powder, the high nitrogen biphase stainless steel powder and binding agent are kneaded by the present invention,
Obtain being kneaded material.
In the present invention, the binding agent preferably includes the component of following weight/mass percentage composition：65~75% paraffin, 23
~30% high density polyethylene (HDPE) and 2~5% stearic acid, the mass percent sum of each component is 100%；More preferably
Including：70% paraffin, 25% high density polyethylene (HDPE) and 5% stearic acid.
In the present invention, the preparation method of the binding agent preferably includes following steps：By the high density polyethylene (HDPE) in
Melted under the conditions of 142~145 DEG C, obtain high-melting-point fused materials；The paraffin and stearic acid are mixed under the conditions of 58~68 DEG C
Fusing is closed, obtains molten low melting point material；The high-melting-point fused materials are mixed with molten low melting point material, bonded
Agent.
In the present invention, the fusion temperature of the high density polyethylene (HDPE) is preferably 143~144 DEG C；The paraffin and tristearin
The mixed melting temperature of acid is preferably 60~62 DEG C；The mixing temperature of the high-melting-point fused materials and molten low melting point material is excellent
Elect 139~147 DEG C, more preferably 140~145 DEG C as.
In the present invention, the mass ratio of the high nitrogen biphase stainless steel powder and binding agent is preferably 5~20：1, more preferably
For 8~17：1, most preferably 9~15：1.
The present invention does not have any special restriction to the mode of the mixing, using mixing well known to those skilled in the art
Mode；The mixing is specifically carried out in kneading machine in embodiments of the present invention, specifically by the high nitrogen two-phase stainless
Powdered steel is added in kneading machine after being mixed with binding agent.In the present invention, the high nitrogen biphase stainless steel powder is preferably average
It is divided into and adds twice, moment of torsion suddenly increases caused by can preventing cooling too soon, equipment loss is reduced, specifically, binding agent is added
After in kneading machine, the high nitrogen biphase stainless steel powder of the half quality is mixed with binding agent, after material mixing completely, then
The high nitrogen biphase stainless steel powder of remaining half quality is added in kneading machine.
In the present invention, the temperature of the mixing is preferably 145~160 DEG C, more preferably 146~157 DEG C.The mixing
Time be preferably 1~2h, more preferably 1.5~1.8h.
Obtain be kneaded material after, the present invention by it is described mixing material granulation after injection moulding, obtain shape sample.The present invention
There is no special restriction to the method for the granulation, using granulation mode well known to those skilled in the art；In the present invention
In carried out preferably in comminutor.
In the present invention, the particle diameter that the granulation obtains granule materials is preferably 1~5mm, more preferably 1.5~2.5mm.
After obtaining granule materials, the granule materials injection moulding is obtained shaping sample by the present invention.In the present invention,
The temperature of the injection moulding is preferably 150~170 DEG C, more preferably 160~165 DEG C；The pressure of the injection moulding is preferred
For 100~120MPa, more preferably 110~115MPa；The time of the injection moulding is preferably 6~10s, more preferably 7~
9s；The dwell pressure of the injection moulding is preferably 80~100MPa, more preferably 90~95MPa.The shaping that the present invention obtains
Sample without short, crackle, overlap the defects of.
In the present invention, preferred pair mould is preheated during the injection moulding, and the preheating temperature of the mould is preferably
40~55 DEG C, more preferably 48~52 DEG C；There is no any special limitation to the shape of the mould in the present invention, according to need
Voluntarily to select the mould of suitable shape.
Obtain after shaping sample, the present invention shapes sample degreasing by described, obtains degreasing blank.In the present invention, it is described
Degreasing preferably includes solvent degreasing and thermal debinding successively.
In the present invention, the temperature of the solvent degreasing is preferably 20~40 DEG C, more preferably 30~35 DEG C；The solvent
The time of degreasing is preferably 2~4h, more preferably 3~3.5h.
In the present invention, the solvent degreasing is preferably normal heptane or trichloro ethylene with degreasing solvent；The degreasing solvent
Total dosage with shaping sample mass ratio be preferably 10~20：1, more preferably 14~18：1, most preferably 15~17：1.
After the completion of solvent degreasing, preferred pair solvent degreasing product of the present invention carries out thermal debinding.In the present invention, the heat is de-
Fat preferably carries out first paragraph thermal debinding, second segment thermal debinding, the 3rd section of thermal debinding, the 4th section of thermal debinding and the 5th section of heat and taken off successively
Fat；
The first paragraph thermal debinding be room temperature to 200~220 DEG C progress first paragraph insulations, be warming up to the first paragraph
The time of thermal debinding is preferably 140~160min, more preferably 150~155min, and the time of first paragraph insulation is preferably
50~70min, more preferably 60~65min；
The second segment thermal debinding is 200~220 DEG C and is warming up to 300~320 DEG C of progress second segment insulations, is warming up to described
The heating-up time of second segment thermal debinding is preferably 190~210min, more preferably 200~205min, the second segment insulation
Time is preferably 50~70min, more preferably 55~65min；
The 3rd section of thermal debinding is 300~320 DEG C and is warming up to the 3rd section of insulation of 415~435 DEG C of progress, is warming up to described
The time of 3rd section of thermal debinding is preferably 105~125min, more preferably 110~120min, the time of the 3rd section of insulation
For 50~70min, more preferably 55~65min；
The 4th section of thermal debinding is 415~435 DEG C and is warming up to the 4th section of insulation of 490~510 DEG C of progress, is warming up to described
The time of 4th section of thermal debinding is preferably 65~85min, more preferably 70~75min, and the time of the 4th section of insulation is 50
~70min, more preferably 55~65min；
The 5th section of thermal debinding is 490~510 DEG C and is warming up to the 5th section of insulation of 700~900 DEG C of progress, is warming up to described
The time of 5th section of thermal debinding is preferably 50~70min, more preferably 55~65min, and the time of the 5th section of insulation is preferred
For 20~30min, more preferably 23~28min.
After the completion of degreasing, degreasing blank is preferably cooled to room temperature by the present invention, and the present invention does not have to the mode of the cooling
Any special limitation, using the type of cooling well known to those skilled in the art；Preferably use in embodiments of the present invention
The mode of furnace cooling.
After obtaining degreasing blank, the degreasing blank is sintered nitriding by the present invention, obtains sintered specimen.In the present invention, institute
The nitrogen that two phase stainless steel loses in sintering process can be supplemented by stating sintering nitriding, and then ensure required mechanical property and corrosion resistant
Corrosion energy.In the present invention, the sintering nitriding is carried out preferably in nitrogen atmosphere, and the partial pressure of the nitrogen is preferably 0.4~
0.8MPa, more preferably 0.7~0.8MPa.In the present invention, the temperature of the sintering nitriding is preferably 1250~1350 DEG C, more
Preferably 1280~1330 DEG C；The time of the sintering nitriding is preferably 2~4 hours, more preferably 2.5~3.5 hours.
After the completion of sintering nitriding, sintering nitriding product is preferably cooled to room temperature by the present invention, and the present invention is to the cooling
Mode does not have any special limitation, using the type of cooling well known to those skilled in the art；In embodiments of the present invention
It is preferred that by the way of furnace cooling.
After obtaining sintered specimen, the sintered specimen is dissolved by the present invention, obtains desalinization conduit coupling use
High nitrogen biphase stainless steel.In the present invention, the temperature of the solid solution is preferably 1040~1200 DEG C, more preferably 1080~1180
℃；The time of the solid solution is preferably 1~2 hour, more preferably 1.2~1.5 hours.
After the completion of solid solution, it is not any to the mode of the cooling to room temperature, the present invention that the present invention will be dissolved product quenching
Special limitation, using the type of cooling well known to those skilled in the art；Water cooling is preferably used in embodiments of the present invention
Mode.
The desalinization conduit coupling high nitrogen biphase stainless steel that the present invention obtains by following weight/mass percentage composition member
Element composition：26~33%Cr, 3~5%Mo, 5.5~9.5%Ni, 0.5~1.0%N, 0.5~1.5%Cu, 0~1.0%Co, C
≤ 0.03%, Mn≤1.5%, P≤0.035%, S≤0.01%, Si≤0.5%, O≤0.006%, the Fe of surplus.
With reference to embodiment to desalinization conduit coupling provided by the invention with high nitrogen biphase stainless steel near net into
Shape Preparation Method is described in detail, but they can not be interpreted as limiting the scope of the present invention.
Fig. 1 is the flow of desalinization conduit coupling high nitrogen biphase stainless steel near clean shaping preparation method of the present invention
Figure, as shown in Figure 1：According to stainless steel electrode rod is prepared after raw material proportioning dispensing, then stainless steel electrode rod is carried out etc.
The rotating electrode atomized nitriding powder of ion, obtains high nitrogen biphase stainless steel powder, and high nitrogen biphase stainless steel powder mixes with binding agent
Injection moulding after refining, then degreasing, sintering nitriding and solid solution are carried out successively, obtain high nitrogen biphase stainless steel.
Embodiment 1
According to 27%Cr, 4.8%Mo, 6.5%Ni, 0.5%Cu, 1.0%Co, surplus is Fe dispensings, successively at 1500 DEG C
Lower melting 4h, 0.5h, lathe machining are forged at 1150 DEG C, obtain consistency more than 99%, without obvious loose, shrinkage cavity etc.
Casting flaw, a diameter of 60mm, length 700mm, surface roughness Ra are 3 μm of stainless steel electrode rod.
The stainless steel electrode rod of preparation is placed in progress PREP nitriding in atomization plant, atomization is set
Standby forvacuum is handled, and is then charged with high pure nitrogen, and vacuum is 1 × 10-3Pa, nitrogen pressure are 3 × 105Pa, atmosphere oxygen contain
The mass percent of amount is less than 0.01%, and electrode bar rotating speed is 30000 revs/min, and the electrode bar amount of feeding is 2 mm/seconds, plasma
Arc power obtains mean particle size D in 300kW50=30 μm, N content is 0.5% spherical high nitrogen biphase stainless steel powder.To
To high nitrogen biphase stainless steel powder be scanned Electronic Speculum test, as a result as shown in Fig. 2 as seen from Figure 2, obtained high nitrogen
Two-phase stainless powdered steel good sphericity, surface is smooth, no satellite powder.
By high nitrogen biphase stainless steel powder and binding agent in mass ratio 12:1 is kneaded 2h under conditions of 145 DEG C, is mixed
Material is refined, binding agent includes the component of following mass fraction：65% paraffin, 30% high density polyethylene (HDPE) and 5% tristearin
Acid；
Material will be kneaded to be granulated, particle diameter 5mm, then by the mixing material injection moulding after granulation, shaped
Sample, 150 DEG C of injection temperature, injection pressure 100MPa, dwell pressure 80MPa, injection time 6s.
Solvent degreasing is carried out to shaping sample, solvent selects normal heptane, and solvent degreasing temperature is 30 DEG C, and degreasing time is
4h, thermal debinding process are：200 DEG C first are risen to from room temperature through 140min, is incubated 50min, then 300 DEG C are risen to through 190min, insulation
50min, then 415 DEG C are risen to through 105min, 70min is incubated, then 490 DEG C are risen to through 85min, 70min is incubated, then through 50min liters
To 700 DEG C, 20min is incubated, room temperature is finally down to, obtains degreasing blank.
Nitriding, 1350 DEG C of sintering temperature are sintered to degreasing blank in a nitrogen atmosphere, sintering time is 2 hours, nitrogen
Partial pressure is 0.6MPa, furnace cooling after sintering.
Sintered specimen is dissolved, the temperature of solid solution is 1200 DEG C, and the time of solid solution is 1 hour, is stood after solution treatment
That is water cooling, desalinization conduit coupling high nitrogen biphase stainless steel is obtained, it is formed and analyzed, it is as a result as follows：27%
Cr, 4.8%Mo, 6.5%Ni, 0.5%Cu, 1.0%Co, 0.5%N, the Fe of surplus and a small amount of impurity.
XRD analysis and microscopic examination are carried out to obtained high nitrogen biphase stainless steel, as a result respectively as shown in figs. 34,
Obtained high nitrogen biphase stainless steel is ferrite (α phases) and austenite (γ phases) two-phase structure it can be seen from Fig. 3~4.
The mechanical property of high nitrogen biphase stainless steel and decay resistance made from embodiment 1 are tested, result of the test
It is as follows：Tensile strength Rm=970MPa, yield strength Rp0.2=770MPa, elongation A=25%, contraction percentage of area Z=35%,
Rockwell hardness=20HRC, room temperature impact absorb work(=250J, CPT=85 DEG C of critical pitting temperature.
The high nitrogen biphase stainless steel three-way piece structure made from embodiment 1 is as shown in figure 5, as seen from Figure 5, use reality
High nitrogen biphase stainless steel made from applying example 1 can be used for the part for preparing complicated shape.
Embodiment 2
According to 33%Cr, 3.5%Mo, 7%Ni, 0.8%Cu, surplus is Fe dispensings, successively at 1500 DEG C melting 5h, in
0.5h, lathe machining are forged at 1300 DEG C, obtains consistency more than 99%, the casting flaw such as obvious loose, shrinkage cavity of nothing, directly
Footpath is 70mm, and length 700mm, surface roughness Ra is 1 μm of stainless steel electrode rod.
The stainless steel electrode rod of preparation is placed in progress PREP nitriding in atomization plant, atomization is set
Standby forvacuum is handled, and is then charged with high pure nitrogen, and vacuum is 1.5 × 10-3Pa, nitrogen pressure are 3 × 105Pa, atmosphere oxygen
The mass percent of content be less than 0.01%, electrode bar rotating speed be 27000 revs/min, the electrode bar amount of feeding is 3 mm/seconds, wait from
Subarc power obtains mean particle size D in 400kW50=40 μm, N content is 0.55% spherical high nitrogen biphase stainless steel powder.
By high nitrogen biphase stainless steel powder and binding agent in mass ratio 11:1 is kneaded 2h under conditions of 142 DEG C, is mixed
Material is refined, binding agent includes the component of following mass fraction：65% paraffin, 30% high density polyethylene (HDPE) and 5% tristearin
Acid；
Material will be kneaded to be granulated, particle diameter 2mm, then by the mixing material injection moulding after granulation, shaped
Sample, 170 DEG C of injection temperature, injection pressure 120MPa, dwell pressure 100MPa, injection time 10s.
Solvent degreasing is carried out to shaping sample, solvent selects trichloro ethylene, and solvent degreasing temperature is 40 DEG C, and degreasing time is
4h, thermal debinding process are：220 DEG C first are risen to from room temperature through 160min, is incubated 50min, then 320 DEG C are risen to through 210min, insulation
70min, then 435 DEG C are risen to through 125min, 50min is incubated, then 510 DEG C are risen to through 65min, 50min is incubated, then through 70min liters
To 900 DEG C, 30min is incubated, room temperature is finally down to, obtains degreasing blank.
Nitriding, 1340 DEG C of sintering temperature are sintered to degreasing blank in a nitrogen atmosphere, sintering time is 3 hours, nitrogen
Partial pressure is 0.8MPa, furnace cooling after sintering.
Sintered specimen is dissolved, the temperature of solid solution is 1040 DEG C, and the time of solid solution is 2 hours, is stood after solution treatment
That is water cooling, desalinization conduit coupling high nitrogen biphase stainless steel is obtained, it is formed and analyzed, it is as a result as follows：33%
Cr, 3.5%Mo, 7%Ni, 0.8%Cu, 0.55%N, the Fe of surplus and a small amount of impurity.
The mechanical property of high nitrogen biphase stainless steel and decay resistance made from embodiment 2 are tested, result of the test
It is as follows：Tensile strength Rm=985MPa, yield strength Rp0.2>=800MPa, elongation A=25%, contraction percentage of area Z=30%,
Rockwell hardness=18HRC, room temperature impact absorb work(=90J, CPT=85 DEG C of critical pitting temperature.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method, comprises the following steps：
(1) according to element mass percent 26~33%Cr, 3~5%Mo, 5.5~9.5%Ni, 0.5~1.5%Cu, 0~
1.0%Co, C≤0.03%, Mn≤1.5%, P≤0.035%, S≤0.01%, Si≤0.5%, O≤0.006%, surplus
Fe carry out dispensing, by raw material it is smelting successively and forging, obtain stainless steel electrode rod；
(2) the stainless steel electrode rod for obtaining the step (1) carries out PREP nitriding powder, obtains high nitrogen
Two-phase stainless powdered steel；
(3) the high nitrogen biphase stainless steel powder for obtaining the step (2) is kneaded with binding agent, obtains being kneaded material；
(4) injection moulding after the mixing material granulation for obtaining the step (3), obtain shaping sample；
(5) the shaping sample degreasing for obtaining the step (4), obtains degreasing blank；
(6) degreasing blank that the step (5) obtains is sintered nitriding, obtains sintered specimen；
(7) sintered specimen that the step (6) obtains is dissolved, obtains desalinization conduit coupling with high nitrogen two-phase not
Become rusty steel.
2. desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method according to claim 1, it is special
Sign is that in the step (2), the condition of PREP nitriding powder includes：Vacuum is 1 × 10-3~10
×10-3Pa, nitrogen pressure are 0.1 × 105~3 × 105Pa, the mass percent of oxygen are less than 0.01%.
3. desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method according to claim 2, it is special
Sign is, in the step (2), the plasma arc power of PREP nitriding powder is 100~400kW.
4. desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method according to claim 3, it is special
Sign is, in the step (2), during PREP nitriding powder, the rotating speed of the stainless steel electrode rod is
18000~30000 revs/min, the amount of feeding of the stainless steel electrode rod is 1~10 mm/second.
5. desalinization conduit coupling high nitrogen biphase stainless steel near clean shaping preparation method according to claim 1,
Characterized in that, binding agent includes the component of following mass percent in the step (3)：65~75% paraffin, 23~
30% high density polyethylene (HDPE), 2~5% stearic acid.
6. desalinization conduit coupling high nitrogen biphase stainless steel near clean shaping preparation method according to claim 1,
Characterized in that, the temperature of injection moulding is 150~170 DEG C in the step (4), the pressure of the injection moulding for 100~
120MPa。
7. desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method according to claim 1, it is special
Sign is, in the step (5) degreasing include solvent degreasing and thermal debinding successively；The temperature of the solvent degreasing degreasing solvent
For 20~40 DEG C, the time of the solvent degreasing is 2~4h.
8. desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method according to claim 7, it is special
Sign is, the thermal debinding in the step (5) includes first paragraph thermal debinding, second segment thermal debinding, the 3rd section of thermal debinding, the successively
Four sections of thermal debindings and the 5th section of thermal debinding；
The first paragraph thermal debinding is room temperature to 200~220 DEG C of progress first paragraph insulations, and it is de- to be warming up to the first paragraph heat
The time of fat is 140~160min, and the time of the first paragraph insulation is 50~70min；
The second segment thermal debinding is 200~220 DEG C and is warming up to 300~320 DEG C of progress second segment insulations, is warming up to described second
The heating-up time of section thermal debinding is 190~210min, and the time of the second segment insulation is 50~70min；
The 3rd section of thermal debinding is 300~320 DEG C and is warming up to the 3rd section of insulation of 415~435 DEG C of progress, is warming up to the described 3rd
The time of section thermal debinding is 105~125min, and the time of the 3rd section of insulation is 50~70min；
The 4th section of thermal debinding is 415~435 DEG C and is warming up to the 4th section of insulation of 490~510 DEG C of progress, is warming up to the described 4th
The time of section thermal debinding is 65~85min, and the time of the 4th section of insulation is 50~70min；
The 5th section of thermal debinding is 490~510 DEG C and is warming up to the 5th section of insulation of 700~900 DEG C of progress, is warming up to the described 5th
The time of section thermal debinding is 50~70min, and the time of the 5th section of insulation is 20~30min.
9. desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method according to claim 1, it is special
Sign is that the temperature of sintering nitriding is 1250~1350 DEG C in the step (6), and the time of the sintering nitriding is small for 2~4
When.
10. desalinization conduit coupling high nitrogen biphase stainless steel near-net-shape method according to claim 1, it is special
Sign is that the temperature of solid solution is 1040~1200 DEG C in the step (7), and the time of the solid solution is 1~2 hour.
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| Publication number | Priority date | Publication date | Assignee | Title |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480550A (en) * | 2002-09-03 | 2004-03-10 | 中国科学院金属研究所 | Ultrapurification high nitrogen austenitic stainless steel and its preparation method |
| CN1654696A (en) * | 2005-04-01 | 2005-08-17 | 青岛马士基集装箱工业有限公司 | Austenitic stainless steel |
| CN101342591A (en) * | 2008-08-29 | 2009-01-14 | 安泰科技股份有限公司 | Method of manufacturing powder metallurgy nitrogen/high nitrogen containing stainless steel parts |
| CN101353768A (en) * | 2008-09-26 | 2009-01-28 | 北京科技大学 | Nitrogen-containing nickel-free stainless steel and metallurgy forming process for powder thereof |
| CN102605270A (en) * | 2011-12-31 | 2012-07-25 | 上海加宁新技术研究所 | Manufacturing method of super double-phase stainless steel impeller shaft |
| CN103276317A (en) * | 2013-05-22 | 2013-09-04 | 江苏启迪合金有限公司 | Production method of two-phase stainless steel |
| CN103706793A (en) * | 2013-12-18 | 2014-04-09 | 潍坊学院 | Preparation method of low-nickel high-nitrogen austenitic stainless steel product |
| CN104152818A (en) * | 2014-08-12 | 2014-11-19 | 昆明理工大学 | Duplex stainless steel and preparation method thereof |
| CN105618776A (en) * | 2016-04-11 | 2016-06-01 | 西安欧中材料科技有限公司 | Preparation method of high-nitrogen stainless steel spherical powder |
| CN105921755A (en) * | 2016-06-22 | 2016-09-07 | 依波精品（深圳）有限公司 | High-nitrogen nickel-free antibacterial stainless steel watch case and manufacturing method thereof |
| CN106521355A (en) * | 2016-11-25 | 2017-03-22 | 四川六合锻造股份有限公司 | Double-phase stainless steel as well as preparation method and application thereof |
-
2017
- 2017-08-16 CN CN201710702714.0A patent/CN107598171B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480550A (en) * | 2002-09-03 | 2004-03-10 | 中国科学院金属研究所 | Ultrapurification high nitrogen austenitic stainless steel and its preparation method |
| CN1654696A (en) * | 2005-04-01 | 2005-08-17 | 青岛马士基集装箱工业有限公司 | Austenitic stainless steel |
| CN101342591A (en) * | 2008-08-29 | 2009-01-14 | 安泰科技股份有限公司 | Method of manufacturing powder metallurgy nitrogen/high nitrogen containing stainless steel parts |
| CN101353768A (en) * | 2008-09-26 | 2009-01-28 | 北京科技大学 | Nitrogen-containing nickel-free stainless steel and metallurgy forming process for powder thereof |
| CN102605270A (en) * | 2011-12-31 | 2012-07-25 | 上海加宁新技术研究所 | Manufacturing method of super double-phase stainless steel impeller shaft |
| CN103276317A (en) * | 2013-05-22 | 2013-09-04 | 江苏启迪合金有限公司 | Production method of two-phase stainless steel |
| CN103706793A (en) * | 2013-12-18 | 2014-04-09 | 潍坊学院 | Preparation method of low-nickel high-nitrogen austenitic stainless steel product |
| CN104152818A (en) * | 2014-08-12 | 2014-11-19 | 昆明理工大学 | Duplex stainless steel and preparation method thereof |
| CN105618776A (en) * | 2016-04-11 | 2016-06-01 | 西安欧中材料科技有限公司 | Preparation method of high-nitrogen stainless steel spherical powder |
| CN105921755A (en) * | 2016-06-22 | 2016-09-07 | 依波精品（深圳）有限公司 | High-nitrogen nickel-free antibacterial stainless steel watch case and manufacturing method thereof |
| CN106521355A (en) * | 2016-11-25 | 2017-03-22 | 四川六合锻造股份有限公司 | Double-phase stainless steel as well as preparation method and application thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109097661A (en) * | 2018-08-10 | 2018-12-28 | 杭州电子科技大学 | The method that stainless steel micro constitutent homogenizes |
| CN109128166A (en) * | 2018-09-27 | 2019-01-04 | 北京科技大学 | A kind of ultrahigh-strength corrosion-resistant oil soft magnetism ferritic stainless steel near-net-shape method |
| CN111057963A (en) * | 2018-10-17 | 2020-04-24 | 山特维克材料技术公司 | Method for producing duplex stainless steel pipe |
| CN112143966A (en) * | 2019-06-26 | 2020-12-29 | 苹果公司 | Nitrided stainless steel with high strength and high ductility |
| EP3800031B1 (en) * | 2019-10-02 | 2022-06-29 | Wittmann Battenfeld GmbH | Method of injection moulding an injection-mouldable thermoplastic material |
| CN111451507A (en) * | 2020-05-27 | 2020-07-28 | 江苏省海洋资源开发研究院(连云港) | Near-net forming method of high-nitrogen nickel-free austenitic stainless steel |
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