CN108004484B - A kind of preparation method of the stainless steel material with shape memory function - Google Patents
A kind of preparation method of the stainless steel material with shape memory function Download PDFInfo
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- CN108004484B CN108004484B CN201711275503.XA CN201711275503A CN108004484B CN 108004484 B CN108004484 B CN 108004484B CN 201711275503 A CN201711275503 A CN 201711275503A CN 108004484 B CN108004484 B CN 108004484B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention discloses a kind of preparation methods of stainless steel material with shape memory function, comprising the following steps: obtains steel ingot after step 1, raw metal melting casting, steel ingot is carried out hot forging swaging into steel bar, obtains blank steel bar；Blank steel bar is carried out stress relief annealing by step 2, and blank steel bar is processed into initial state product and is heat-treated, semi-finished product are obtained；Step 3 is plastically deformed semi-finished product, is heated to 580 DEG C of heat preservation furnace coolings again, repeats the operation of step 3, until the recovery strain of semi-finished product is 4%.Of the invention mainly solves the problems, such as that yield strength existing for the stainless steel hitch frame of traditional skull tractor is excessive, bending property is lower, recovery rate is low, by using with improve existing Fe-Mn-Si memorial alloy, a kind of stainless steel material with shape memory function of low cost is obtained, yield strength is no more than 375 N/mm2, toughness reaches 8.5 J/cm2, shape recovery ratio reaches 97.4%, overcomes existing deficiency.
Description
Technical field
The present invention relates to stainless steel material field, in particular to the system of a kind of stainless steel material with shape memory function
Preparation Method.
Background technique
Traction is the effect using additional tractive force and counterextension power, is pulled to limbs or trunk, to reach
To the purpose for the treatment of and adjuvant treatment.It draws existing reset and has fixed function, be widely used in orthopaedics, be a kind of simple and effective
Treatment method therapeutic purposes can also be reached by traction especially for inoperable patient.Various skeletal tractions are
Fracture, dislocation are carried out by being fixed on the utensils such as the spicule of privileged site, traction bow, rope, hitch frame and traction counterweight
It slowly resets, it is both a kind of method of reset, can also play good fixed function.Bone traction must be according to fractures
Position, age, the different of classification of fracture adjust leads, weight.
The damage or when chronic disease caused by cervical vertebra is because of internal and external cause is general to use when leading to Cervical stenosis or displacement
Skull traction device makes cervical vertebra fix and reset.However traditional skull traction device structure is relatively simple, it is general to only have
One traction bow, a traction bow only have two fixing points, it is caused to draw limited strength, and traction effect is poor, moreover, traction
Bend flexible deformation during prolonged traction, causes patient that can bear additional pain, traction effect treatment is poor, cervical vertebra
Fixed and reset is more difficult, and treatment time is extended, meanwhile, deformed traction bow can not be restored by conventional method to original
Shape, thus generally range scrappage, this obviously causes waste to traction bow, moreover, skull traction device belong to it is more expensive
Medical instrument, premature failure skull traction device undoubtedly will increase medical treatment cost.
Summary of the invention
Goal of the invention of the invention is: in view of the above problems, provide it is a kind of with shape memory function not
Become rusty the preparation method of Steel material, mainly solve yield strength existing for the stainless steel hitch frame of traditional skull tractor it is excessive,
The problem that bending property is lower, recovery rate is low, by using with improve existing Fe-Mn-Si memorial alloy, obtain it is a kind of it is low at
This stainless steel material with shape memory function, to overcome existing deficiency.
The technical solution adopted by the invention is as follows: a kind of preparation method of the stainless steel material with shape memory function,
Characterized by comprising the following steps:
Steel ingot is obtained after step 1, raw metal melting casting, then steel ingot is hot-forged by ingot conditioning surface dregs
Pressure, primary hot forging is pressed into plate, after then cooling down plate to certain temperature, carries out hot forging swaging again to plate into required specification
Steel bar, cool to steel bar with the furnace room temperature, obtain blank steel bar；The steel ingot is calculated by mass percentage by following components group
At: carbon 0.09-0.12%, nickel 4.36-5.23%, chromium 3.86-5.20%, manganese 12.46-13.33%, silicon 2.51-
The total amount of 3.01%, niobium 1.47-1.89%, titanium 4.23-4.87%, yttrium 0.20-0.40%, p and s are no more than 0.035%,
Surplus is iron and its inevitable impurity；
Blank steel bar is carried out stress relief annealing by step 2, needed for being then processed into blank steel bar with mach mode
Shape obtains initial state product, and initial state product is placed in heat-treatment furnace and is heat-treated, semi-finished product are obtained；
Step 3, at room temperature carries out bending ductility deformation to semi-finished product, is then placed in deformed semi-finished product
It is heated to 580 DEG C in heating furnace, keeps the temperature 30min, then cools to room temperature with the furnace again, repeats the operation of step 3, until semi-finished product
Recovery strain be 4% until, obtain finished product.
Further, in step 1, the control of forging and stamping temperature is at 1000 DEG C, after cooling plate to 780-820 DEG C of temperature, to plate
Material carries out hot forging swaging into the steel bar of required specification again.
Further, in step 1, heating rate when initial heating is controlled in 80 DEG C/h, is warming up to 600 DEG C to steel ingot
When, heating rate is improved to 200 DEG C/h, until steel ingot reaches 1000 DEG C.
Further, in step 2, initial state product is placed in heat-treatment furnace and is heated to 620 DEG C, keep the temperature 20-30min,
Then oil quenching obtains semi-finished product to room temperature.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are: of the invention provides a kind of tool
There is the preparation method of the stainless steel material of shape memory function, mainly solves the stainless steel hitch frame of traditional skull tractor
The problem that existing yield strength is excessive, bending property is lower, recovery rate is low is remembered by using with the existing Fe-Mn-Si of improvement
Recall alloy, obtains a kind of stainless steel material with shape memory function of low cost, tension degree is very low, only 383-485
N/mm2, yield strength is no more than 375 N/mm2, toughness reaches 8.5 J/cm2, shape recovery ratio reaches 97.4%, overcomes existing
Deficiency present in stainless steel traction bow.
Detailed description of the invention
Fig. 1 is the three dimensional structure diagram of skull traction device of the invention；
Fig. 2 is Stiff Block partial cross-sectional structural diagram of the invention；
Fig. 3 is connection central part schematic view of the front view of the invention；
Fig. 4 is connection central part schematic cross-sectional view of the invention.
Marked in the figure: 1 is fixed ring, 2 be Stiff Block, and 201 be air hole, and 3 be elastomer block, and 4 be locating sleeve, and 5 be to lead
Draw screw, 6 be pressing portion, and 7 be traction syringe needle, and 8 be traction bow, and 9 be connection central part, and 901 be connection shell, and 902 be screw rod,
903 be connection cover, and 904 be sleeve, and 905 be boss, and 10 be retaining ring, and 11 be spongy layer.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figures 1 to 4, a kind of skull traction device, the fixed ring 1 including cyclic structure, fixed ring 1 include rigidity
Block 2 and the elastomer block 3 that can be stretched, Stiff Block 2 and elastomer block 3 are staggered and are fixedly connected to form fixed ring 1, that is to say
It says, the diameter for the annular ring that fixed ring 1 is surrounded can adjust to obtain suitably sized by tensile elasticity block 3.Stiff Block 2
Middle part be provided with locating sleeve 4, locating sleeve 4 is vertical and is fixedly mounted on Stiff Block 2 towards on the side wall outside fixed ring 1, fixed
It is fitted with traction screw 5 in the casing 4 of position, one end of the remotely located casing 4 of traction screw 5 is fixedly connected with pressing portion 6, traction
The other end of screw 5 passes through locating sleeve 4 and Stiff Block 2 and forms traction syringe needle 7, and traction screw 5 can be in 4 He of locating sleeve
Axis direction between Stiff Block 2 along traction screw 5 moves, and traction screw 5 can be formed with locating sleeve 4 and is threadedly engaged, into
And precession of the traction syringe needle 7 in fixed ring 1 is realized by rotation pressing portion 6 and screws out operation.
In order to preferably fix fixed ring 1, prevent fixed ring 1 from sliding on head, the top of Stiff Block 2 is fixed
It is connected with the traction bow 8 of arched shape, the both ends of traction bow 8 are fixedly connected on Stiff Block 2, and traction bow 8 is across entire
Fixed ring 1, the i.e. spanwise dimension of traction bow 8 are not less than the annular ring diameters size of fixed ring 1.The top setting of fixed ring 1 is more
Root traction bow 8, the center setting connection central part 9 that more traction bows 8 intersect, more traction bows 8 are realized by connection central part 9
The fixation of angle each other connects and is provided with retaining ring 10 on central part 9, to draw counterweight convenient for placing for connecting rope.
Further, in order to make the angle between connection central part 9 preferably fixed traction bow 8, central part 9 is connected
Including the connection shell 901 with hollow structure, the side wall for connecting shell 901 is equipped with perforation (not marking in figure), in order to lead
It draws a bow and 8 passes through, the offset of traction bow 8 is limited by perforating, and then reach the technology of the angle between fixed traction bow 8
Draw is better achieved convenient for skull traction device in effect.Further, in order to not make traction bow 8 during the installation process not
It can shift and shake, so that skull traction device is more smooth and is more stably mounted on the head of patient, in connection shell
In 901, connects the bottom of shell 901 vertically and be fixedly connected with screw rod 902, external screw thread is provided on screw rod 902, connect shell
901 upper surface is opened wide and passes through connection cover 903 and seals, and the top of connection cover 903 is arranged retaining ring 10, and connection cover 903 is towards connection
Vertical in the middle part of the inner wall of shell 901 to fix and be connected with sleeve 904, sleeve 904 has hollow structure, and the inner wall of sleeve 904 is set
It is equipped with internal screw thread, screw rod 902 passes through traction bow 8 and is threadedly engaged with sleeve 904, and then compresses traction bow 8 by sleeve 904.More
Further, in order to improve the compression effect of sleeve 904, the bottom of screw rod 902 expanding formation boss 905 outward passes through boss
905 limit and the extruding of sleeve 904 are fixed on traction bow 8 firmly in connection shell 901.
Further, the span that traction bow 8 can be changed during expanding due to fixed ring 1, it is therefore desirable to traction bow
8 while having yield strength well, it is necessary to there is bending strength well, and there is surrender by force in traditional stainless steel
Big, the lower problem of bending property is spent, and in use, stainless steel traction bow becomes after multiple plastic deformation
It obtains irregularly, its reinstatement cannot be made by way of pulling or beaing, traction bow in irregular shape can make fixed ring
On each Stiff Block unbalance stress be difficult to adjust to required tractive force when with traction counterweight add weight traction, cause to draw
Effect is deteriorated, and patient can bear more unnecessary pains, and therefore, traction bow keeps regular shape important, in order to overcome
These defects existing for stainless steel traction bow, the present invention provide a kind of stainless steel with shape memory function of low cost
Material, specifically, the stainless steel material with shape memory function of present invention meaning is calculated by mass percentage by with the following group
Be grouped as: carbon 0.09-0.12%, nickel 4.36-5.23%, chromium 3.86-5.20%, manganese 12.46-13.33%, silicon are
The total amount of 2.51-3.01%, niobium 1.47-1.89%, titanium 4.23-4.87%, yttrium 0.20-0.40%, p and s are no more than
0.035%, surplus is iron and its inevitable impurity.
Further, with shape memory function stainless steel traction bow preparation method the following steps are included:
Steel ingot is obtained after step 1, raw metal melting casting, then steel ingot is hot-forged by ingot conditioning surface dregs
Pressure, forging and stamping temperature control is at 1000 DEG C, and initially heating rate when heating is controlled in 80 DEG C/h, when steel ingot is warming up to 600 DEG C,
It improves heating rate and is pressed into plate until steel ingot reaches 1000 DEG C to 200 DEG C/h in primary hot forging, then cools down plate extremely
780-820 DEG C, hot forging swaging is carried out again to plate into the steel bar of required specification, steel bar is cooled to the furnace room temperature, obtains original
Base steel bar；
Blank steel bar is carried out stress relief annealing by step 2, and blank steel bar is then processed into traction with mach mode
Arc-shaped obtains initial state traction bow, and initial state traction bow is placed in heat-treatment furnace and is heated to 620 DEG C, keeps the temperature 20-30min,
Then oil quenching obtains semi-finished product traction bow to room temperature；
Step 3, at room temperature carries out bending ductility deformation to semi-finished product traction bow, then by deformed traction
Bow, which is placed in heating furnace, is heated to 580 DEG C, keeps the temperature 30min, then cools to room temperature with the furnace again, repeats the operation of step 3, until
Until the recovery strain of traction bow is 4%, finished product traction bow is obtained.
Among the above, if apparent plastic deformation occurs in use in traction bow obtained, traction can be removed
Bow carries out traction bow to heat the shape that can resile, and it is strong thus to overcome surrender present in the stainless steel traction bow of tradition
Degree is big, bending property is low, can recovery capability difference problem, improve the traction effect of skull traction device.Further, at this
In the stainless steel of invention, although belonging to Fe-Mn-Si memory alloy system, still must strict control carbon content, if carbon
Content be more than 0.09-0.12%, then the yield strength for the stainless steel material that can make is excessive, result in the need for consumption very substantially
Power could be bent traction bow, be unfavorable for the use of skull traction device, meanwhile, yield strength, which becomes larger, can make later period heating restore to become
Must be difficult, needing to be heated to very high temperature can be only achieved the effect of shape recovery, this undoubtedly brings inconvenience.Further, on
Although yttrium in stating belongs to rare earth element, but it cannot draw by lanthanide series and scandium element substitution, after yttrium is substituted by scandium
The ability of bow recoverable deformation is decreased obviously, and yield strength is significantly raised, and deformed traction bow, can only when heating recovery
Part recovery is carried out, has significant difference with original shape, therefore, yttrium plays a significant role in stainless steel of the invention, can not be with
Meaning is substituted.
Stainless steel material in order to better illustrate the present invention is exemplified below specific embodiment, as shown in table 1.
1 stainless steel material embodiment 1-6(mass percent of table: %)
The main performance of stainless steel material made from above-described embodiment is as shown in table 2:
The main performance of 2 embodiment 1-6 final alloy material of table (at 25 DEG C of room temperature)
Available by table 2, the tensile strength of stainless steel material of the invention is very low, only 383-485 N/mm2, surrender
Intensity is no more than 375 N/mm2, toughness reaches 8.5 J/cm2, shape recovery ratio reaches 97.4%, while with the increasing of yttrium content
Add, shape recovery rate increases, it is indicated above that the addition of yttrium can be improved the shape recovery ratio of Fe-Mn-Si memorial alloy.
Stainless steel material of the invention solves that yield strength existing for traditional stainless steel material is excessive, the lower problem of bending property,
The easily-deformable defect scrapped of traction bow is overcome, the service life of traction bow is extended.
Further, it is contemplated that skull traction device can be worn over the head of patient for a long time, and the present invention is set on Stiff Block 2
Multiple air holes 201 are equipped with, as shown in Fig. 2, air hole 201 is evenly arranged on Stiff Block 2, the setting of air hole 201 on the one hand can
With solve the problems, such as at fixed ring 1 it is airtight, easily perspire fuel-displaced, on the other hand can be dripped by air hole 201 at fixed ring 1
Add thimerosal, and then achieve the purpose that disinfection cleaning, avoids the trouble for removing skull traction device in distraction procedure, guarantee
Traction effect.
As an improvement embodiment, since skull traction device is mainly constituted with metal parts, rigidity
Larger, after patient wears, experience sense and comfort are very poor, especially when skull traction device and patients head's matching degree are poor
When, patient can therefore and bear larger pain, be unfavorable for patient carry out traction therapeutic, to solve this problem, fixed ring 1 it is interior
One circle spongy layer 11 of wall bonding, spongy layer 11 can form an annular coil structures along the inner wall of fixed ring 1, can also only exist
Exist on Stiff Block 2, and then forms section nodular.In the present invention, since the annular ring diameters of fixed ring 1 are variable, and sponge material
Expect that the tensile property of itself is poor, therefore, spongy layer 11 can be positioned only on the inner wall of Stiff Block 2, the inner wall of elastomer block 3
It is not provided with, thus overcomes the problems, such as that sponge material tensile property is poor.Skull traction device can be buffered by the way that spongy layer 11 is arranged
Rigidity, increase fixed ring 1 flexibility, when contacting the head of itself and patient, improve the experience sense and comfort of patient, together
When fixed ring 1 can be made sufficiently to be bonded with head, improve skull traction device and the matching degree of patients head, patient is born
Pain effectively reduced, conducive to traction operation treatment, meanwhile, spongy layer 11 can also be matched with air hole 201 and be set
It sets, thimerosal is conveyed into spongy layer 11 by air hole 201, head is infiltrated by spongy layer 11, makes cleaning effect more preferably,
Also it is conducive to perspire oil removing in distraction procedure, effectively prevent bacteria breed at this.Further, the thickness Ying Bu little of spongy layer 11
In 3mm, preferably between 5-10mm, more preferably 7mm.
Further, in order to prevent traction screw 5 drill it is too deep, be provided between traction screw 5 and pressing portion 6 depth quarter
Scale designation (is not drawn into) in figure, when the tip for drawing syringe needle 7 of traction screw 5 and the inner wall of Stiff Block 2 are neat in the vertical direction
Usually, the port edge of 4 cantilever end of locating sleeve flushes in the vertical direction with the start index line that deep calibration marks, when leading
When drawing 5 precession of screw, the port edge of 4 cantilever end of locating sleeve corresponds to the graduation mark of deep calibration label in the vertical direction
Position represented by scale value, the as deep amount of precession, thus facilitate operator accurately to control precession amount, avoid exceeding
Inner table of skull and damage brain tissue.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (1)
1. a kind of preparation method of the stainless steel material with shape memory function, which comprises the following steps:
Steel ingot is obtained after step 1, raw metal melting casting, then steel ingot is carried out hot forging pressure by ingot conditioning surface dregs, and one
Secondary hot forging is pressed into plate, after then cooling down plate to certain temperature, carries out hot forging swaging again to plate into the steel of required specification
Item cools to steel bar with the furnace room temperature, obtains blank steel bar；The steel ingot is calculated by mass percentage composed of the following components:
Carbon is 0.09-0.12%, nickel 4.36-5.23%, chromium 3.86-5.20%, manganese 12.46-13.33%, silicon 2.51-3.01%,
Niobium is 1.47-1.89%, titanium 4.23-4.87%, yttrium 0.20-0.40%, and the total amount of p and s is no more than 0.035%, and surplus is
Iron and its inevitable impurity；
Blank steel bar is carried out stress relief annealing by step 2, and blank steel bar is then processed into required shape with mach mode
Shape obtains initial state product, and initial state product is placed in heat-treatment furnace and is heat-treated, semi-finished product are obtained；
Step 3, at room temperature carries out bending ductility deformation to semi-finished product, deformed semi-finished product is then placed in heating
Be heated to 580 DEG C in furnace, keep the temperature 30min, then cool to room temperature with the furnace again, repeat the operation of step 3, until semi-finished product can
Until recovery deflection is 4%, finished product is obtained；
In step 1, the control of forging and stamping temperature after cooling plate to 780-820 DEG C of temperature, carries out heat to plate at 1000 DEG C again
The steel bar of specification needed for forging and stamping are formed；Wherein, heating rate when initial heating is controlled in 80 DEG C/h, is warming up to 600 to steel ingot
DEG C when, heating rate is improved to 200 DEG C/h, until steel ingot reaches 1000 DEG C；
In step 2, initial state product is placed in heat-treatment furnace and is heated to 620 DEG C, keep the temperature 20-30min, then oil quenching to room
Temperature obtains semi-finished product.
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| CN1062060C (en) * | 1997-12-31 | 2001-02-14 | 天津大学国家教委形状记忆材料工程研究中心 | Shape-memory stainless steel joint for pipeline |
| CN1151307C (en) * | 2002-09-09 | 2004-05-26 | 吉林大学 | Method for making iron based marmem pipe joint |
| CN101215678B (en) * | 2008-01-17 | 2010-06-09 | 四川大学 | Training-free casting iron-base shape memory alloy containing high temperature ferrite |
| CN105331905B (en) * | 2015-11-12 | 2017-05-03 | 深圳市雅鲁实业有限公司 | Novel non-magnetic stainless steel and preparation method thereof |
| CN106811702B (en) * | 2015-11-28 | 2018-12-21 | 成都九十度工业产品设计有限公司 | A kind of magnetism-free stainless steel |
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