CN104889398A - Anti-abrasion anti-etching alloy rod production method through powder metallurgy process - Google Patents
Anti-abrasion anti-etching alloy rod production method through powder metallurgy process Download PDFInfo
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Abstract
The invention relates to an anti-abrasion anti-etching alloy rod production method through a powder metallurgy process. Iron base alloy powder with anti-abrasion anti-etching performance characteristics and inner carbon steel or stainless steel alloy are subjected to hot isostatic pressing encapsulation combination to be formed into anti-abrasion anti-etching alloy rods through hot isostatic pressing combination. The produced alloy rod tissue structure is compact completely, and two layers of alloy are integrated tightly, accordingly, the requirement of application work conditions for anti-abrasion anti-etching performances is met, the use amount of high-cost alloy powder is reduced, the production cost is reduced, and the product market competitiveness is improved. The method is simple to operate, easy to control and provided with wide application markets.
Description
Technical field
The present invention relates to a kind of preparation method of alloy bar material, particularly relate to a kind of method that powder metallurgical technique prepares antifriction anticorrosion alloy bar.
Background technology
Under some special operation condition conditions, tool and mould or component of machine surface are not only stood abrasive grains hard in moving component or working media and are directly contacted and cause wearing and tearing, also stand the corrosiveness of humidity, acid or other corrosive agent, as parts such as the screw rod in injection molded machinery or screw sleeves, on the one hand owing to adding a large amount of hard particles in plastics, as glass fibre, carbon fiber etc., cause these parts wears to aggravate, in plastics, corrosive elements produces chemical attack to parts on the other hand.In order to make the parts being applied to these special operation conditions possess long service life, use alloy surface must have high anti-wear performance and corrosion resisting property, in addition in order to bear working stress load and impact, alloy need possess certain hardness and toughness.
Current tool and mould alloy mainly adopts traditional cast forging process preparation, casting process liquid alloy Slow cooling solidifies, easily segregation is there is in alloying component in process of setting, form thick tissue, even if through follow-up forging rolling process, this harmful structure still alloy performance can bring harmful effect, causes the performance of alloy to comprise intensity, toughness, anti-wear performance, grindability energy etc. and is in level on the low side.Powder metallurgical technique is adopted to prepare the problem that alloy solves segregation, prepare alloy structure fine uniform, compare casting wrought alloy performance to have and significantly promote, but powder preparation is with high costs, bring the raising of alloy monolithic cost, how reducing the cost that powder metallurgical technique prepares alloy is the problem that needs solve.
Summary of the invention
For solving the deficiencies in the prior art, the powder metallurgical technique that the invention provides a kind of low cost prepares the method for antifriction anticorrosion alloy bar.
For achieving the above object, powder metallurgical technique of the present invention prepares the method for antifriction anticorrosion alloy bar, and described antifriction anticorrosion alloy is ferrous alloy, and the method comprises following preparation process:
Step one, prepare iron(-)base powder by powder metallurgical technique;
Step 2, get the cylindrical high temperature insostatic pressing (HIP) jacket of one end open, high temperature insostatic pressing (HIP) jacket diameter is 30 ~ 600mm, high temperature insostatic pressing (HIP) jacket center is fixed with carbon element steel or stainless steel circular bar, center diameter of rod is 20mm-300mm, iron(-)base powder is filled in centrally between bar and high temperature insostatic pressing (HIP) jacket thickness be jolt ramming in the annular space of 10 ~ 300mm;
Step 3, carry out vacuumize degassing process to high temperature insostatic pressing (HIP) jacket, vacuum is to high temperature insostatic pressing (HIP) jacket heating and thermal insulation, and the degassed rear continuation heating and thermal insulation of high temperature insostatic pressing (HIP) jacket, carries out soldering and sealing process to high temperature insostatic pressing (HIP) jacket end subsequently;
Step 4, hip treatment is carried out to degassed and after soldering and sealing high temperature insostatic pressing (HIP) jacket, cool with stove after combining closely with center bar until the complete fine and close consolidation of iron(-)base powder in high temperature insostatic pressing (HIP) jacket, outer surface heat isostatic pressed jacket layer is removed in turning, obtained antifriction anticorrosion alloy bar.
The present invention is combined by the center bar of high temperature insostatic pressing (HIP) jacket by the iron(-)base powder and internal layer carbon steel or stainless steel alloy with wear and corrosion behavior feature, the bar forming double-layer alloy structure is combined through high temperature insostatic pressing (HIP) compacting, the outer layer alloys that iron(-)base powder is formed makes Surface of Rod Bar have wear and corrosion behavior, can meet wearing and tearing and corrosivity operating mode to the application requirement of wear-resistant decay resistance, inner alloy adopts cheap carbon element steel or stainless steel, greatly reduces the production cost of bar.In preparation method, the restriction of the thickness of inner alloy center bar, high temperature insostatic pressing (HIP) jacket diameter, alloy powder filling thickness be ensure that the center bar of powder metallurgy and inner alloy can reach completely fine and close and the structure of combining closely in high temperature insostatic pressing (HIP) pressing process, in use procedure, bar inner alloy can provide enough mechanical support to outer wear-and corrosion-resistant ferrous alloy layer, bar general performance goes out good obdurability, is satisfied with the performance requirement of corrosion and abrasiveness operating mode simultaneously.
As the restriction to aforesaid way, in described step one, powder metallurgical technique adopts antivacuum mode to carry out melting then powder by atomization, comprises following processing step:
A, molten steel is transferred to ladle;
B, molten steel ladle upper surface cover ladle covering slag, and heating ladle covering slag, maintains the degree of superheat of molten steel; Pass into inert gas at ladle bottom to stir molten steel;
C, molten steel is flowed into pre-warmed tundish by the mozzle of ladle bottom with regime flow, enter when tundish buries mozzle lower surface until molten steel and tundish covering slag is applied to molten steel upper surface;
D, continued compensation heating is carried out to tundish, maintain the degree of superheat of molten steel;
E, molten steel enter after the spray chamber with protective atmosphere from tundish and adopt inert gas to carry out powder by atomization under stabilizing gas pressure; obtained alloy powder is settled down to bottom spray chamber; after enter the storage powder tank with protective atmosphere, enter storage powder tank storage dress after being sieved by protection screening plant alloy powder again.
Powder metallurgical technique of the present invention adopts antivacuum mode to carry out melting then powder by atomization, take multiple available protecting means in process to reduce and harmful being mingled be mixed into and prevent alloy oxygen content from increasing, the covering slag as ladle possesses isolated air and conductive heater function; Ladle bottom passes into inert gas, makes diverse location molten steel temperature in ladle balanced, accelerates harmful floating be mingled with simultaneously and removes; The mozzle of ladle bottom plays guide functions to molten steel on the one hand, reduces molten steel circulation process turbulent flow and produces, avoid slag or minimizing to be mingled with and enter into next link, avoids molten steel stream on the other hand directly and the contact of air, prevents molten steel oxygen content from rising; Tundish covering slag prevents the molten steel flowing through tundish from directly contacting with air, reduces the rising of molten steel oxygen content; Molten steel enters before tundish and preheats tundish, local coagulation or cause second-phase to be separated out in advance when preventing molten steel from entering tundish; Spray chamber, storage powder tank have forced cooling refrigerating function; Powder protection screening plant inside cavity is connected with malleation inert protective gas, and play a protective role to powder sieving process prevents powder from waving simultaneously; The ingot fine microstructures obtained after alloy powder consolidation obtained is thus even, possesses excellent comprehensive mechanical property.Owing to adopting non-vacuum melting powder by atomization, single prepares powder weight can reach 1.5-8 ton, and powder preparation cost is significantly reduced.
As the restriction to aforesaid way, in described powder metallurgical technique, superheat of liquid steel is 100 DEG C-150 DEG C, and tundish pre-heating temperature is 800 DEG C-1200 DEG C.
As the restriction to aforesaid way, in described powder metallurgical technique, mozzle molten steel flow scope is 10 kg/min-50 kg/min.
As the restriction to aforesaid way, in described powder metallurgical technique, inert gas is argon gas or nitrogen, gas purity >=99.999%, oxygen content≤2ppm.
As the restriction to aforesaid way, in described powder metallurgical technique, atomization pressure is 1.0MPa-5.0MPa.
As the restriction to aforesaid way, in described step 3, high temperature insostatic pressing (HIP) jacket heating and thermal insulation is at 200 DEG C-600 DEG C.
As the restriction to aforesaid way, in described step 3, high temperature insostatic pressing (HIP) jacket is degassed continues heating and thermal insulation >=2h to 0.01Pa.
As the restriction to aforesaid way, the hip temperature of described step 4 is 1050 ~ 1200 DEG C, and pressure is >=100MPa, time >=1h.
In sum, adopt technical scheme of the present invention, to suppress through high temperature insostatic pressing (HIP) combine having the iron(-)base powder of wear and corrosion behavior feature and internal layer carbon steel or stainless steel bars, form densification completely and the double-layer alloy structure of combining closely, alloy bar material outer surface ferrous alloy layer is made to have wear and corrosion behavior feature, decrease the use amount of high cost alloy powder simultaneously, reduce production cost, improve the competitiveness of product in market.Powder metallurgical technique of the present invention prepares the method for antifriction anticorrosion alloy bar, and easy control simple to operate, has a wide range of applications market.
Accompanying drawing explanation
Do further to describe in detail to the present invention below in conjunction with the drawings and the specific embodiments:
Fig. 1 is the structural representation of the antifriction anticorrosion alloy bar of the embodiment of the present invention;
Fig. 2 is the structural representation of the antifriction anticorrosion alloy bar cross section of the embodiment of the present invention
In figure: 1, center bar; 2, outer layer alloys; 3, high temperature insostatic pressing (HIP) jacket; D1: center diameter of rod; D2: high temperature insostatic pressing (HIP) jacket diameter; H: bar height.
Detailed description of the invention
As shown in Figure 1, the height of antifriction anticorrosion alloy bar is H.
As shown in Figure 2, high temperature insostatic pressing (HIP) jacket 3 is the cylindrical of one end open, and high temperature insostatic pressing (HIP) jacket diameter D2 is 30 ~ 600mm, and carbon steel or stainless center bar 1 are positioned at the center of high temperature insostatic pressing (HIP) jacket 3, and center diameter of rod D1 is 20 ~ 300mm; The annular space that high temperature insostatic pressing (HIP) jacket 3 and center bar 1 are formed, for loading iron(-)base powder, forms outer layer alloys 2 through high temperature insostatic pressing (HIP) compacting.
Embodiment one
The present embodiment relates to a kind of method that powder metallurgical technique prepares antifriction anticorrosion alloy bar, comprises following preparation process:
Step one, prepare a kind of iron(-)base powder with wear and corrosion behavior, the mass percent of alloy component is C:2.68%; W:0.5%; Mo:1.3%; Cr:16.5%; V:8.3%; Nb:2.0%; Co:0.2%; Si:0.6%; Mn:0.3%; N:0.12%; O:0.006%; Surplus is iron and impurity, and adopt antivacuum powder metallurgical technique to prepare iron(-)base powder, powder metallurgical technique step is as follows:
A, molten steel is transferred to ladle, molten steel Weight Loaded is 3 tons;
B, molten steel ladle upper surface cover ladle covering slag, heating ladle covering slag, and the degree of superheat maintaining molten steel is 110 DEG C; Pass into nitrogen at ladle bottom to stir molten steel;
C, molten steel is flowed into the tundish being preheated to 850 DEG C by the molten steel mozzle of ladle bottom, control mozzle entrance size, make molten steel flow be 50 kg/min, molten steel buries mozzle lower surface after entering tundish time, apply tundish covering slag;
D, carry out continued compensation heating to tundish, the degree of superheat maintaining molten steel is 110 DEG C;
E, molten steel adopts nitrogen to carry out powder by atomization as gas medium after tundish enters spray chamber, nitrogen gas purity >=99.999%, oxygen content≤2ppm, atomization pressure is 3.5 MPa, powder by atomization process maintains molten steel temperature and stablizes, molten steel flow is stablized, atomization pressure is stablized, obtained iron(-)base powder is settled down to bottom spray chamber, after enter the storage powder tank with nitrogen protection atmosphere, after powder by atomization completes, treat that in storage powder tank, iron(-)base powder cool to room temperature is sieved iron(-)base powder by nitrogen protection screening plant, enter storage powder tank storage equipment again to use,
Step 2, iron(-)base powder is packed into the cylindrical high temperature insostatic pressing (HIP) jacket of one end open, as shown in Figure 1, 2, high temperature insostatic pressing (HIP) jacket diameter D2 is 200mm, wall thickness 2mm, high H is 1800mm, and high temperature insostatic pressing (HIP) jacket center is fixed with 45# Steel Bar prepared by cast forging process, and its diameter D1 is 100mm, high temperature insostatic pressing (HIP) jacket material is mild steel, iron(-)base powder centrally between bar and high temperature insostatic pressing (HIP) jacket annular space load; First nitrogen deaeration is passed into high temperature insostatic pressing (HIP) jacket before filling, airtight connection high temperature insostatic pressing (HIP) jacket and storage powder tank body subsequently, be filled to by iron(-)base powder in high temperature insostatic pressing (HIP) jacket, high temperature insostatic pressing (HIP) jacket dress powder implementation Process vibration operation, increases iron(-)base powder loading density;
Step 3, iron(-)base powder have loaded and have carried out vacuumize degassing process to high temperature insostatic pressing (HIP) jacket afterwards, vacuum high temperature insostatic pressing (HIP) jacket heating and thermal insulation is at 300 DEG C, degassedly to 0.01Pa, continue heating and thermal insulation >=2h, subsequently soldering and sealing process is carried out to high temperature insostatic pressing (HIP) jacket end;
Step 4, high temperature insostatic pressing (HIP) jacket is carried out hip treatment, hip temperature 1100 DEG C, under >=100MPa pressure retention time >=1h after the complete fine and close consolidation of inner iron(-)base powder, cool with stove, outer surface heat isostatic pressed jacket layer is removed in turning, and further forging deformation obtains diameter 100mm shape antifriction anticorrosion alloy bar.
Embodiment two
The present embodiment relates to a kind of method that powder metallurgical technique prepares antifriction anticorrosion alloy bar, comprises following preparation process:
Step one, prepare a kind of iron(-)base powder with wear and corrosion behavior, the mass percent of alloy component is C:2.08%; W:0.5%; Mo:1.5%; Cr:16.5%; V:4.6%; Nb:1.8%; Co:0.3%; Si:0.6%; Mn:0.5%; N:0.08%; O:0.006%; Surplus is iron and impurity, and adopt antivacuum powder metallurgical technique to prepare iron(-)base powder, powder metallurgical technique step is as follows:
A, molten steel is transferred to ladle, molten steel Weight Loaded is 5 tons;
B, molten steel ladle upper surface cover ladle covering slag, heating ladle covering slag, and the degree of superheat maintaining molten steel is 150 DEG C; Pass into argon gas at ladle bottom to stir molten steel;
C, molten steel is flowed into the tundish being preheated to 1000 DEG C by the molten steel mozzle of ladle bottom, control mozzle entrance size, make molten steel flow be 40 kg/min, molten steel buries mozzle lower surface after entering tundish time, apply tundish covering slag;
D, carry out continued compensation heating to tundish, the degree of superheat maintaining molten steel is 150 DEG C;
E, molten steel adopts nitrogen to carry out powder by atomization as gas medium after tundish enters spray chamber, nitrogen gas purity >=99.999%, oxygen content≤2ppm, atomization pressure is 2.0MPa, powder by atomization process maintains molten steel temperature and stablizes, molten steel flow is stablized, atomization pressure is stablized, obtained iron(-)base powder is settled down to bottom spray chamber, after enter the storage powder tank with nitrogen protection atmosphere, after powder by atomization completes, treat that in storage powder tank, iron(-)base powder cool to room temperature is sieved iron(-)base powder by nitrogen protection screening plant, enter storage powder tank storage equipment again to use,
Step 2, iron(-)base powder is packed into the cylindrical high temperature insostatic pressing (HIP) jacket of one end open, as shown in Figure 1, 2, high temperature insostatic pressing (HIP) jacket diameter D2 is 500mm, wall thickness 1.5mm, high H is 1600mm, and high temperature insostatic pressing (HIP) jacket center is fixed with 45# Steel Bar prepared by cast forging process, and its diameter D1 is 260mm, high temperature insostatic pressing (HIP) jacket material is mild steel, iron(-)base powder centrally between bar and high temperature insostatic pressing (HIP) jacket annular space load; First argon gas deaeration is passed into high temperature insostatic pressing (HIP) jacket before filling, airtight connection high temperature insostatic pressing (HIP) jacket and storage powder tank body subsequently, be filled to by iron(-)base powder in high temperature insostatic pressing (HIP) jacket, high temperature insostatic pressing (HIP) jacket dress powder implementation Process vibration operation, increases iron(-)base powder loading density;
Step 3, iron(-)base powder have loaded and have carried out vacuumize degassing process to high temperature insostatic pressing (HIP) jacket afterwards, vacuum high temperature insostatic pressing (HIP) jacket heating and thermal insulation is at 500 DEG C, degassedly to 0.01Pa, continue heating and thermal insulation >=2h, subsequently soldering and sealing process is carried out to high temperature insostatic pressing (HIP) jacket end;
Step 4, high temperature insostatic pressing (HIP) jacket is carried out hip treatment, hip temperature 1200 DEG C, under >=100MPa pressure retention time >=1h after the complete fine and close consolidation of inner iron(-)base powder, cool with stove, outer surface heat isostatic pressed jacket layer is removed in turning, and further forging deformation obtains diameter 300mm shape antifriction anticorrosion alloy bar.
Embodiment three
The present embodiment relates to a kind of method that powder metallurgical technique prepares antifriction anticorrosion alloy bar, comprises following preparation process:
Step one, prepare a kind of iron(-)base powder with wear and corrosion behavior, the mass percent of alloy component is C:2.1%; W:0.5%; Mo:1.5%; Cr:22.0%; V:4.0%; Nb:1.0%; Co:0.2%; Si:0.8%; Mn:0.4%; N:0.05%; O:0.008%; Surplus is iron and impurity, and adopt antivacuum powder metallurgical technique to prepare iron(-)base powder, powder metallurgical technique step is as follows:
A, molten steel is transferred to ladle, molten steel Weight Loaded is 7 tons;
B, molten steel ladle upper surface cover ladle covering slag, heating ladle covering slag, and the degree of superheat maintaining molten steel is 140 DEG C; Pass into nitrogen at ladle bottom to stir molten steel;
C, molten steel is flowed into the tundish being preheated to 1200 DEG C by the molten steel mozzle of ladle bottom, control mozzle entrance size, make molten steel flow be 30 kg/min, molten steel buries mozzle lower surface after entering tundish time, apply tundish covering slag;
D, carry out continued compensation heating to tundish, the degree of superheat maintaining molten steel is 140 DEG C;
E, molten steel adopts nitrogen to carry out powder by atomization as gas medium after tundish enters spray chamber, nitrogen gas purity >=99.999%, oxygen content≤2ppm, atomization pressure is 5.0MPa, powder by atomization process maintains molten steel temperature and stablizes, molten steel flow is stablized, atomization pressure is stablized, obtained iron(-)base powder is settled down to bottom spray chamber, after enter the storage powder tank with nitrogen protection atmosphere, after powder by atomization completes, treat that in storage powder tank, iron(-)base powder cool to room temperature is sieved iron(-)base powder by nitrogen protection screening plant, enter storage powder tank storage equipment again to use,
Step 2, iron(-)base powder is packed into the cylindrical high temperature insostatic pressing (HIP) jacket of one end open, as shown in Figure 1, 2, high temperature insostatic pressing (HIP) jacket diameter D2 is 300mm, wall thickness 2.0mm, high H is 1800mm, and high temperature insostatic pressing (HIP) jacket center is fixed with 45# Steel Bar prepared by cast forging process, and its diameter D1 is 50mm, high temperature insostatic pressing (HIP) jacket material is mild steel, iron(-)base powder centrally between bar and high temperature insostatic pressing (HIP) jacket annular space load; First nitrogen deaeration is passed into high temperature insostatic pressing (HIP) jacket before filling, airtight connection high temperature insostatic pressing (HIP) jacket and storage powder tank body subsequently, be filled to by iron(-)base powder in high temperature insostatic pressing (HIP) jacket, high temperature insostatic pressing (HIP) jacket dress powder implementation Process vibration operation, increases iron(-)base powder loading density;
Step 3, iron(-)base powder have loaded and have carried out vacuumize degassing process to high temperature insostatic pressing (HIP) jacket afterwards, vacuum high temperature insostatic pressing (HIP) jacket heating and thermal insulation is at 400 DEG C, degassedly to 0.01Pa, continue heating and thermal insulation >=2h, subsequently soldering and sealing process is carried out to high temperature insostatic pressing (HIP) jacket end;
Step 4, high temperature insostatic pressing (HIP) jacket is carried out hip treatment, hip temperature 1150 DEG C, under >=100MPa pressure retention time >=1h after the complete fine and close consolidation of inner iron(-)base powder, cool with stove, outer surface heat isostatic pressed jacket layer is removed in turning, and further forging deformation obtains diameter 200mm shape antifriction anticorrosion alloy bar.
Obtaining alloy bar material to the invention described above embodiment adopts different heat treatment system to obtain different performance, and the heat treatment used comprises annealing, Quench and temper.Described Quenching Treatment relates to the bar after by annealing at 815 DEG C of-900 DEG C of preheating temperatures, is incubated 15-40 minute, is quenched to 530 DEG C-550 DEG C subsequently, then below air cooling to 50 DEG C after homogeneous temperature under putting into the temperature of 1000 DEG C-1200 DEG C.Described tempering relates to the bar after by quenching and is heated to the temperature of 540-670 DEG C and is incubated 1.5-2 hour, subsequently below air cooling to 50 DEG C, so repeats 2 to 3 times.
By above-mentioned method for preparing powder metallurgy, obtain fully dense alloy bar material, bar outer layer alloys possesses high anti-wear performance and possesses high corrosion resisting property simultaneously, and based on so a kind of performance characteristics, alloy of the present invention is adapted at having wearing and tearing and the use of corrosive conditions occasion.Because alloy bar material of the present invention adopts unique alloy structure, the alloy powder of cheap carbon steel or stainless steel parts fictitious hosts costliness is used to be prepared, save the use of precious alloy, reduce production cost, do not affect overall serviceability simultaneously, product competitiveness in the market is got a promotion.
Claims (9)
1. powder metallurgical technique prepares a method for antifriction anticorrosion alloy bar, it is characterized in that, described antifriction anticorrosion alloy is ferrous alloy, and the method comprises following preparation process:
Step one, prepare iron(-)base powder by powder metallurgical technique;
Step 2, get the cylindrical high temperature insostatic pressing (HIP) jacket of one end open, high temperature insostatic pressing (HIP) jacket diameter is 30 ~ 600mm, high temperature insostatic pressing (HIP) jacket center is fixed with carbon element steel or stainless steel circular bar, center diameter of rod is 20mm-300mm, iron(-)base powder is filled in centrally between bar and high temperature insostatic pressing (HIP) jacket thickness be jolt ramming in the annular space of 10 ~ 300mm;
Step 3, carry out vacuumize degassing process to high temperature insostatic pressing (HIP) jacket, vacuum is to high temperature insostatic pressing (HIP) jacket heating and thermal insulation, and the degassed rear continuation heating and thermal insulation of high temperature insostatic pressing (HIP) jacket, carries out soldering and sealing process to high temperature insostatic pressing (HIP) jacket end subsequently;
Step 4, hip treatment is carried out to degassed and after soldering and sealing high temperature insostatic pressing (HIP) jacket, cool with stove after combining closely with center bar until the complete fine and close consolidation of iron(-)base powder in high temperature insostatic pressing (HIP) jacket, outer surface heat isostatic pressed jacket layer is removed in turning, obtained antifriction anticorrosion alloy bar.
2. powder metallurgical technique according to claim 1 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: in described step one, powder metallurgical technique adopts antivacuum mode to carry out melting then powder by atomization, comprises following processing step:
A, molten steel is transferred to ladle;
B, molten steel ladle upper surface cover ladle covering slag, and heating ladle covering slag, maintains the degree of superheat of molten steel; Pass into inert gas at ladle bottom to stir molten steel;
C, molten steel is flowed into pre-warmed tundish by the mozzle of ladle bottom with regime flow, enter when tundish buries mozzle lower surface until molten steel and tundish covering slag is applied to molten steel upper surface;
D, continued compensation heating is carried out to tundish, maintain the degree of superheat of molten steel;
E, molten steel enter after the spray chamber with protective atmosphere from tundish and adopt inert gas to carry out powder by atomization under stabilizing gas pressure; obtained alloy powder is settled down to bottom spray chamber; after enter the storage powder tank with protective atmosphere, enter storage powder tank storage dress after being sieved by protection screening plant alloy powder again.
3. powder metallurgical technique according to claim 2 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: in described powder metallurgical technique, superheat of liquid steel is 100 DEG C-150 DEG C, and tundish pre-heating temperature is 800 DEG C-1200 DEG C.
4. powder metallurgical technique according to claim 2 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: in described powder metallurgical technique, mozzle molten steel flow scope is 10 kg/min-50 kg/min.
5. powder metallurgical technique according to claim 2 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: in described powder metallurgical technique, inert gas is argon gas or nitrogen, gas purity >=99.999%, oxygen content≤2ppm.
6. powder metallurgical technique according to claim 2 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: in described powder metallurgical technique, atomization pressure is 1.0MPa-5.0MPa.
7. powder metallurgical technique according to claim 1 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: in described step 3, high temperature insostatic pressing (HIP) jacket heating and thermal insulation is at 200 DEG C-600 DEG C.
8. powder metallurgical technique according to claim 1 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: in described step 3, high temperature insostatic pressing (HIP) jacket is degassed continues heating and thermal insulation >=2h to 0.01Pa.
9. powder metallurgical technique according to claim 1 prepares the method for antifriction anticorrosion alloy bar, it is characterized in that: the hip temperature of described step 4 is 1050 DEG C ~ 1200 DEG C, and pressure is >=100MPa, time >=1h.
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| CN106735227A (en) * | 2016-12-12 | 2017-05-31 | 航天长征睿特科技有限公司 | A kind of high temperature insostatic pressing (HIP) preparation method of double screw extruder screwing element |
| CN108284227A (en) * | 2018-01-29 | 2018-07-17 | 北京汇越新材料科技有限公司 | A kind of preparation method of the direct coating comminutor machine barrel based on heat and other static pressuring processes |
| CN108326317A (en) * | 2018-03-28 | 2018-07-27 | 西北工业大学 | TiAl alloy and Ti2The method that AlNb powder prepares annular element |
| CN112935260A (en) * | 2021-01-26 | 2021-06-11 | 黄石中睿科技有限责任公司 | Easily machined alloy bar and preparation method thereof |
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