CN103286154B - Manufacturing method of GH3600 nickel alloy extruded tube - Google Patents
Manufacturing method of GH3600 nickel alloy extruded tube Download PDFInfo
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Abstract
The invention provides a manufacturing method of a GH3600 nickel alloy extruded tube. The manufacturing method comprises the following steps of: 1, performing machining treatment on a GH3600 nickel alloy ingot casting, thereby obtaining an extruded ingot blank; 2, jacketing the extruded ingot blank so as to obtain a jacketed ingot blank; 3, heating the jacketed ingot blank and performing isothermal extrusion on the jacketed ingot blank, thereby obtaining an extruded tube blank; 4, performing straightening treatment; and 5, removing the jackets on the internal and external surfaces by acid washing, thereby obtaining the GH3600 nickel alloy extruded tube, wherein the inner diameter of the GH3600 nickel alloy extruded tube is in the range from 18 mm to 22 mm, and the outer diameter of the GH3600 nickel alloy extruded tube is in the range from 28 mm to 34 mm. The preparation method provided by the invention is simple, good in repeatability and suitable for industrial large-scale production. The GH3600 nickel alloy extruded tube prepared by the method provided by the invention is high in yield, high in grain size number, good in dimensional homogeneity and less in subsequent processing steps; and therefore, the GH3600 nickel alloy extruded tube meets the technical requirements for aerospace extruded tubes and has a high popularization value and an obvious economic benefit.
Description
Technical field
The invention belongs to space flight high-temperature alloy material technical field, be specifically related to a kind of preparation method of GH3600 nickel alloy extrude tubes.
Background technology
GH3600 nickel alloy be a kind of Ni-based can the austenite high temperature alloy of solution strengthening, its main component is nickel-chromium-iron.GH3600 nickel alloy has good high-temperature corrosion resistance and oxidation resistance, and excellent cold and hot working and welding technological properties, and suitable for making less than 1100 DEG C bears the anti-oxidant part of low load.Based on above feature, GH3600 nickel alloy is widely used in the fluid delivery tube material under high temperature and high pressure environment, and is widely used in space industry.GH3600 nickel alloy tubing is due to its special applied environment, need, under high temperature, hyperbaric environment, there is good stability in use, corresponding GH3600 nickel alloy tubing must have good surfaces externally and internally quality and uniform grain size level just seems very important, therefore, just very important to the cogging method of final finished quality influence obvious GH3600 nickel alloy tubing.
At present, tubing cogging method for austenite high temperature alloy is exactly extrusion blooming mode the most widely, extrusion blooming mode has good applicability for conventional austenitic alloy: the force way first extruding ingot blank is reasonable, and the extrude tubes processed is not easy defects such as occurring radial cracking, loosen; Secondly in extrusion process, extrude ingot blank and bear very large shear stress, have obvious benefit to crystal grain thinning, therefore adopted by raw material ingot blank extrusion blooming technique to prepare tubing and obtain and apply increasingly extensively.
But up to now, rarely have technical staff that traditional pressing method can be utilized to prepare space flight high accuracy GH3600 nickel alloy extrude tubes, its reason has four: one, traditional extrusion process is set in extrusion temperature within the scope of 1150 DEG C ~ 1250 DEG C usually, very serious for washing away with wear-out failure of the equipment such as recipient, extrusion die at such high temperatures, cause the external diameter of made extrude tubes, wall thickness equidimension lack of homogeneity; Two, under the hot conditions of 1150 DEG C ~ 1250 DEG C, extruding can cause the surface oxidation of extrude tubes serious, blemish is obvious, in follow-up processing process, often need machining to remove oxide layer and the defect on surface, cause subsequent processing operations to increase, the yield rate of tubing is low; Three, due under GH3600 nickel alloy common process in order to reduce the wearing and tearing of mould, extrusion speed is at about 100mm/s, extrusion process can produce larger resistance of deformation, extrusion ratio generally can only control between 6 ~ 8 by therefore conventional extrusion process, die break DeGrain, the grain size uniformity of extrude tubes is poor; Four, because the resistance of deformation of GH3600 nickel alloy is large in conventional extrusion process, so fully will ensure that compression that extruder bears is in safe range, this just directly limit the specification of GH3600 nickel alloy extrude tubes; That is, the diameter of the force such as pressure ram, recipient and stressed member is relatively large, controlled to ensure extrusion process safety.Therefore conventional extrusion technique is generally applicable to extruding ingot blank compared with large gauge and extrude tubes, if and preparation is compared with the GH3600 nickel alloy extrude tubes of small dimension, then need to carry out follow-up processing process, following process process is long, technique is wayward, causes the quality stability of tubing poor.
From the above, adopt the of poor quality of the extrude tubes that obtains of traditional extrusion process, defect is many, and can be hereditary to finished product tubing, the processing performance of combined influence finished product tubing, causes the yield rate of finished product tubing low, cancel even by the gross, seriously hinder the application and development of GH3600 nickel alloy material.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides the preparation method that a kind of preparation technology is simple, repeatable by force, be suitable for the GH3600 nickel alloy extrude tubes of industrialization large-scale production.The yield rate of the GH3600 nickel alloy extrude tubes adopting the method to prepare is high, dimensional homogeneity is good, grain size number is 9 ~ 10 grades, subsequent processing operations is few, meet the technical requirement of space industry GH3600 nickel alloy tubing high accuracy, high finished product rate, high structure stability, there is promotional value and significant economic benefit widely.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of GH3600 nickel alloy extrude tubes, and it is characterized in that, the method comprises the following steps:
Step one, GH3600 Ni alloy ingot is carried out mechanical process, obtain the extruding ingot blank that cross sectional shape is annular;
Step 2, be not more than 1 × 10 in vacuum
-1in the vacuum welding equipment of Pa, all adopt copper tube to carry out involucrum the surfaces externally and internally extruding ingot blank described in step one, obtain involucrum ingot blank; The shell thickness of extruding ingot blank inner surface and the shell thickness of extrusion ingot blank outer surface are 1mm ~ 2mm;
Step 3, the ingot blank of involucrum described in step 2 is heated to 930 DEG C ~ 960 DEG C after be incubated, then utilize extruder to insulation after involucrum ingot blank carry out Isothermal Extrusion, obtain extrusion tube blank; The extrusion ratio of described Isothermal Extrusion is 10 ~ 15, and the extruding rate of described Isothermal Extrusion is 1mm/s ~ 2mm/s;
Step 4, extrusion tube blank described in step 3 is carried out straightening processing;
Step 5, the extrusion tube blank in step 4 after straightening processing is placed in nitric acid pickling and removes surfaces externally and internally involucrum, obtain GH3600 nickel alloy extrude tubes; The internal diameter of described GH3600 nickel alloy extrude tubes is 18mm ~ 22mm, and the external diameter of described GH3600 nickel alloy extrude tubes is 28mm ~ 34mm.
The preparation method of above-mentioned a kind of GH3600 nickel alloy extrude tubes, is characterized in that, the time t be incubated described in step 3 meets: 0.8d≤t≤1.2d, and wherein d is the external diameter of involucrum ingot blank, and the unit of d is the unit of mm, t is min.
The preparation method of above-mentioned a kind of GH3600 nickel alloy extrude tubes, it is characterized in that, the material of the recipient in extruder described in step 3, pressure ram and squeezing needle is K403 nickel alloy, and the material of described extrusion die is silicon carbide-based cermet or boron nitride-base cermet.
The preparation method of above-mentioned a kind of GH3600 nickel alloy extrude tubes, it is characterized in that, before Isothermal Extrusion is carried out to the involucrum ingot blank after insulation, need, first by the preheating temperature to 930 of the recipient in extruder DEG C ~ 960 DEG C, the temperature of pressure ram, squeezing needle and extrusion die to be all preheated to 850 DEG C ~ 870 DEG C.
The preparation method of above-mentioned a kind of GH3600 nickel alloy extrude tubes, it is characterized in that, the glacing flatness of the extrusion tube blank in step 4 after straightening processing is not more than 3mm/m.
The preparation method of above-mentioned a kind of GH3600 nickel alloy extrude tubes, is characterized in that, the mass percent concentration of nitric acid described in step 5 is 40% ~ 68%.
The present invention compared with prior art has the following advantages:
1, the present invention will extrude ingot blank and adopt isothermal extrusion process at a slow speed, extrusion temperature is controlled within the scope of 930 DEG C ~ 960 DEG C, extruding rate controls at 1mm/s ~ 2mm/s, extruding ingot blank is enable to keep steady temperature to extrude, overcome traditional extrusion process under temperature is 1150 DEG C ~ 1250 DEG C conditions, extrudes washing away and serious wear destruction extrusion die, and the technological deficiency such as made extrude tubes external diameter, wall thickness equidimension lack of homogeneity.The present invention finds through large quantity research, because GH3600 nickel alloy is that drawing by high temperature ductility within the scope of 930 DEG C ~ 960 DEG C is very high in temperature, and yield strength is relatively low, possesses the processing conditions using isothermal extrusion process at a slow speed, impact simultaneously in isothermal, extrusion process at a slow speed suffered by mould is very little, extrude tubes internal-and external diameter tolerance can be controlled in 0.5mm, and extrude tubes axiality controls in 0.5mm.
2, the present invention adopts the surfaces externally and internally of red copper involucrum technology to extruding ingot blank all to protect, add the fashion of extrusion of isothermal low speed fashion of extrusion of the present invention relative to routine, greatly reduce heating-up temperature and the heat time of extruding ingot blank, significantly reduce extruding ingot blank in extrusion process with the contact probability of air, effectively prevent the generation of extrude tubes surface oxide layer and defect, extrude tubes is made not need to carry out oxide layer and the defect that machining removes surface in follow-up processing, subsequent processing operations is few, therefore the utilization rate of material is significantly improved.
3, and traditional GH3600 nickel alloy extrusion process (extrusion ratio of conventional extruded is generally chosen between 6 ~ 8, extruding rate is about 100mm/s) compare, the extrusion ratio of Isothermal Extrusion of the present invention is high, and extruding rate is 1/50 ~ 1/100 of conventional extruded speed, effectively can ensure the temperature remained constant extruding ingot blank in extrusion process, greatly reduce the resistance of deformation in hot procedure, and extrusion ratio can reach 10 ~ 15, make die break successful, the grain size of extrude tubes can be controlled in the scope of 9 ~ 10 grades.
4, compared with traditional GH3600 nickel alloy extrusion process, the extrusion temperature of Isothermal Extrusion of the present invention is low, extruding rate is slow, can extrude in the safe tolerance range of small extruding machine, the GH3600 alloy extrusion tubing specification obtained is little, steady quality, following process process is short, is beneficial to process and the quality control of finished product tubing.
5, for reducing the wearing and tearing of the equipment such as squeezing needle, extrusion die in extruder of the present invention, extrusion process is stablized carry out, make the inside/outside diameter size excellent in uniform of made extrude tubes, the present invention has carried out great many of experiments to the material of the equipment such as squeezing needle, extrusion die, discovery has high rigidity, low shock resistance material is optimum, the material of final selection recipient, pressure ram and squeezing needle is K403 nickel alloy, and the material selecting extrusion die is silicon carbide-based cermet or boron nitride-base cermet.
6, preparation technology of the present invention is simple, repeatable strong, is suitable for industrialization large-scale production; The yield rate of the GH3600 nickel alloy extrude tubes adopting the present invention to prepare is high, and grain size number is high, and subsequent processing operations is few, meets the technical requirement of space flight tubing, has promotional value and significant economic benefit widely.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is preparation technology's flow chart of GH3600 nickel alloy extrude tubes of the present invention.
Fig. 2 is the cross section structure schematic diagram of involucrum ingot blank of the present invention.
Fig. 3 is the Isothermal Extrusion process schematic of the embodiment of the present invention 1 involucrum ingot blank.
Description of reference numerals:
1-extruding ingot blank; 2-copper tube; 3-involucrum ingot blank;
4-recipient; 5-pressure ram; 6-squeezing needle;
7-extrusion die.
Detailed description of the invention
Embodiment 1
Composition graphs 1, Fig. 2 and Fig. 3, the preparation method of the present embodiment GH3600 nickel alloy extrude tubes comprises the following steps:
Step one, GH3600 Ni alloy ingot is carried out mechanical process, obtain extruding ingot blank 1; The shape of cross section of described extruding ingot blank 1 is internal diameter is 24mm, and external diameter is the annular of 81mm;
Step 2, be not more than 1 × 10 in vacuum
-1in the vacuum welding equipment of Pa, all adopt copper tube 2 to carry out involucrum the surfaces externally and internally extruding ingot blank 1 described in step one, and the shell thickness of extruding ingot blank 1 inner surface is 1mm with the shell thickness of extruding ingot blank 1 outer surface, obtains involucrum ingot blank 3; The shape of cross section of described involucrum ingot blank 3 is internal diameter is 22mm, and external diameter is the annular of 83mm;
Step 3, the ingot blank of involucrum described in step 23 is heated to 930 DEG C after be incubated, then utilize extruder to insulation after involucrum ingot blank 3 carry out Isothermal Extrusion, obtain extrusion tube blank; The extrusion ratio of described Isothermal Extrusion is 13.7, and the extruding rate of described Isothermal Extrusion is 1mm/s;
The time t of the present embodiment insulation meets: t=1.0d (i.e. 83min), and wherein d is the external diameter value of involucrum ingot blank 3, and the unit of d is mm;
The present embodiment carries out the extrusion process schematic diagram of Isothermal Extrusion as shown in Figure 3 to involucrum ingot blank 3; The present embodiment is before carrying out Isothermal Extrusion to the involucrum ingot blank 3 after insulation, need first by the preheating temperature to 930 DEG C of the recipient 4 in extruder, the temperature of pressure ram 5, squeezing needle 6 and extrusion die 7 is all preheated to 850 DEG C, then the involucrum ingot blank 3 after insulation is placed between the pressure ram after preheating 5 and extrusion die 7, and be sheathed on the squeezing needle after preheating 6, extruded by promoting to carry out in metering hole that the involucrum ingot blank 3 be sheathed on squeezing needle 6 is pushed into extrusion die 7 by pressure ram 5 afterwards; The material of the recipient 4 in the extruder that the present embodiment adopts, pressure ram 5 and squeezing needle 6 is K403 nickel alloy, and the material of extrusion die 7 is silicon carbide-based cermet; In specific implementation process, the internal diameter of recipient 4 can be selected to be 85mm, the diameter of squeezing needle 2 is 20mm, and the aperture of extrusion die 7 metering hole is 30mm;
Step 4, extrusion tube blank described in step 3 is carried out straightening processing; In the present embodiment, the temperature of described straightening processing is 400 DEG C, and the glacing flatness of the extrusion tube blank after straightening processing is not more than 3mm/m;
Step 5, the extrusion tube blank in step 4 after straightening processing is placed in mass percent concentration be 48% nitric acid pickling remove surfaces externally and internally involucrum, obtain GH3600 nickel alloy extrude tubes.
The specification of GH3600 nickel alloy extrude tubes prepared by the present embodiment is
coaxiality deviation is not more than 0.3mm; The surface of GH3600 nickel alloy extrude tubes prepared by the present embodiment is without defects such as obvious oxide layer and visual visible ditch bar, cracking, peelings.
The yield rate of GH3600 nickel alloy extrude tubes prepared by the present embodiment, grain size number and subsequent processing operations logarithmic data are in table 1.
Embodiment 2
Composition graphs 1 and Fig. 2, the preparation method of the present embodiment GH3600 nickel alloy extrude tubes comprises the following steps:
Step one, GH3600 Ni alloy ingot is carried out mechanical process, obtain extruding ingot blank 1; The shape of cross section of described extruding ingot blank 1 is internal diameter is 24mm, and external diameter is the annular of 79mm;
Step 2, be not more than 1 × 10 in vacuum
-1in the vacuum welding equipment of Pa, all adopt copper tube 2 to carry out involucrum the surfaces externally and internally extruding ingot blank 1 described in step one, and the shell thickness of extruding ingot blank 1 inner surface is 2mm with the shell thickness of extruding ingot blank 1 outer surface, obtains involucrum ingot blank 3; The shape of cross section of described involucrum ingot blank 3 is internal diameter is 20mm, and external diameter is the annular of 83mm;
Step 3, the ingot blank of involucrum described in step 2 is heated to 950 DEG C after be incubated, then utilize extruder to insulation after involucrum ingot blank 3 carry out Isothermal Extrusion, obtain extrusion tube blank; The extrusion ratio of described Isothermal Extrusion is 15.0, and the extruding rate of described Isothermal Extrusion is 1.5mm/s;
The time t of the present embodiment insulation meets: t=1.2d (i.e. 100min), and wherein d is the external diameter value of involucrum ingot blank 3, and the unit of d is mm;
The present embodiment, before carrying out Isothermal Extrusion to the involucrum ingot blank after insulation, needs first by the preheating temperature to 950 DEG C of the recipient in extruder, the temperature of pressure ram, squeezing needle and extrusion die is all preheated to 860 DEG C; The material of the recipient that the present embodiment adopts, pressure ram and squeezing needle is K403 nickel alloy, and the material of extrusion die is boron nitride-base cermet; In specific implementation process, the internal diameter of recipient can be selected to be 85mm, the diameter of squeezing needle is 18mm, and the aperture of extrusion die metering hole is 28mm;
Step 4, extrusion tube blank described in step 3 is carried out straightening processing; In the present embodiment, the temperature of described straightening processing is 500 DEG C, and the glacing flatness of the extrusion tube blank after straightening processing is not more than 3mm/m;
Step 5, the extrusion tube blank in step 4 after straightening processing is placed in mass percent concentration be 58% nitric acid pickling remove surfaces externally and internally involucrum, obtain GH3600 nickel alloy extrude tubes.
The specification of GH3600 nickel alloy extrude tubes prepared by the present embodiment is
coaxiality deviation is not more than 0.4mm; The surface of GH3600 nickel alloy extrude tubes prepared by the present embodiment is without defects such as obvious oxide layer and visual visible ditch bar, cracking, peelings.
The yield rate of GH3600 nickel alloy extrude tubes prepared by the present embodiment, grain size number and subsequent processing operations logarithmic data are in table 1.
Embodiment 3
Composition graphs 1 and Fig. 2, the preparation method of the present embodiment GH3600 nickel alloy extrude tubes comprises the following steps:
Step one, GH3600 Ni alloy ingot is carried out mechanical process, obtain extruding ingot blank 1; The shape of cross section of described extruding ingot blank 1 is internal diameter is 26mm, and external diameter is the annular of 81mm;
Step 2, be not more than 1 × 10 in vacuum
-1in the vacuum welding equipment of Pa, all adopt copper tube 2 to carry out involucrum the surfaces externally and internally extruding ingot blank 1 described in step one, and the shell thickness of extruding ingot blank 1 inner surface is 1.5mm with the shell thickness of extruding ingot blank 1 outer surface, obtains involucrum ingot blank 3; The shape of cross section of described involucrum ingot blank 3 is internal diameter is 23mm, and external diameter is the annular of 84mm;
Step 3, the ingot blank of involucrum described in step 23 is heated to 960 DEG C after be incubated, then utilize extruder to insulation after involucrum ingot blank 3 carry out Isothermal Extrusion, obtain extrusion tube blank; The extrusion ratio of described Isothermal Extrusion is 10.0, and the extruding rate of described Isothermal Extrusion is 2mm/s;
In the present embodiment, the time t of insulation meets t=0.8d (i.e. 67min), and wherein d is the external diameter value of involucrum ingot blank 3, and the unit of d is mm;
The present embodiment, before carrying out Isothermal Extrusion to the involucrum ingot blank after insulation, needs first by the preheating temperature to 960 DEG C of the recipient in extruder, the temperature of pressure ram, squeezing needle and extrusion die is all preheated to 870 DEG C; The material of the recipient that the present embodiment adopts, pressure ram and squeezing needle is K403 nickel alloy, and the material of extrusion die is boron nitride-base cermet; In specific implementation process, the internal diameter of recipient can be selected to be 85mm, the diameter of squeezing needle is 22mm, and the aperture of extrusion die metering hole is 34mm;
Step 4, extrusion tube blank described in step 3 is carried out straightening processing; In the present embodiment, the temperature of described straightening processing is 500 DEG C, and the glacing flatness of the extrusion tube blank after straightening processing is not more than 3mm/m;
Step 5, the extrusion tube blank in step 4 after straightening processing is placed in mass percent concentration be 40% ~ 68% nitric acid pickling remove surfaces externally and internally involucrum, obtain GH3600 nickel alloy extrude tubes.
The specification of GH3600 nickel alloy extrude tubes prepared by the present embodiment is
coaxiality deviation is not more than 0.4mm; The surface of GH3600 nickel alloy extrude tubes prepared by the present embodiment is without defects such as obvious oxide layer and visual visible ditch bar, cracking, peelings.
The yield rate of GH3600 nickel alloy extrude tubes prepared by the present embodiment, grain size number and subsequent processing operations logarithmic data are in table 1.
Embodiment 4
Composition graphs 1 and Fig. 2, the preparation method of the present embodiment GH3600 nickel alloy extrude tubes comprises the following steps:
Step one, GH3600 Ni alloy ingot is carried out mechanical process, obtain extruding ingot blank 1; The shape of cross section of described extruding ingot blank 1 is internal diameter is 25mm, and external diameter is the annular of 80mm;
Step 2, be not more than 1 × 10 in vacuum
-1in the vacuum welding equipment of Pa, all adopt copper tube 2 to carry out involucrum the surfaces externally and internally extruding ingot blank 1 described in step one, and the shell thickness of extruding ingot blank 1 inner surface is 1.5mm with the shell thickness of extruding ingot blank 1 outer surface, obtains involucrum ingot blank 3; The shape of cross section of described involucrum ingot blank 3 is internal diameter is 22mm, and external diameter is the annular of 83mm;
Step 3, the ingot blank of involucrum described in step 23 is heated to 940 DEG C after be incubated, then utilize extruder to insulation after involucrum ingot blank 3 carry out Isothermal Extrusion, obtain extrusion tube blank; The extrusion ratio of described Isothermal Extrusion is 11.7, and the extruding rate of described Isothermal Extrusion is 1.6mm/s;
In the present embodiment, the time t of insulation meets t=0.9d (i.e. 75min), and wherein d is the external diameter value of involucrum ingot blank 3, and the unit of d is mm;
The present embodiment, before carrying out Isothermal Extrusion to the involucrum ingot blank after insulation, needs first by the preheating temperature to 940 of recipient DEG C, the temperature of pressure ram, squeezing needle and extrusion die is all preheated to 870 DEG C;
The material of the recipient that the present embodiment adopts, pressure ram and squeezing needle is K403 nickel alloy, and the material of extrusion die is boron nitride-base cermet; In specific implementation process, the internal diameter of recipient can be selected to be 85mm, the diameter of squeezing needle is 21mm, and the aperture of extrusion die metering hole is 32mm;
Step 4, extrusion tube blank described in step 3 is carried out straightening processing; In the present embodiment, the temperature of described straightening processing is 600 DEG C, and the glacing flatness of the extrusion tube blank after straightening processing is not more than 3mm/m;
Step 5, the extrusion tube blank in step 4 after straightening processing is placed in mass percent concentration be 68% nitric acid pickling remove surfaces externally and internally involucrum, obtain GH3600 nickel alloy extrude tubes.
The specification of GH3600 nickel alloy extrude tubes prepared by the present embodiment is
coaxiality deviation is not more than 0.5mm; The surface of GH3600 nickel alloy extrude tubes prepared by the present embodiment is without defects such as obvious oxide layer and visual visible ditch bar, cracking, peelings.
The yield rate of GH3600 nickel alloy extrude tubes prepared by the present embodiment, grain size number and subsequent processing operations logarithmic data are in table 1.
Comparative example 1
The preparation method of this comparative example GH3600 nickel alloy extrude tubes is identical with embodiment 1, wherein difference is: in step 3, the extrusion process of involucrum ingot blank 3 adopts traditional extrusion process, that is: the heating of blank and the preheating of mould is first carried out, wherein the heating-up temperature of involucrum ingot blank 3 is 1150 DEG C, the preheat temperature of recipient 4 is 550 DEG C, the preheat temperature of pressure ram 5, squeezing needle 6 and extrusion die 7 is 350 DEG C, then extruder is utilized to carry out non-isothermal extruding to the involucrum ingot blank 3 after heating, extruding rate is 100mm/s, and extrusion ratio is 6.5.
The specification of GH3600 nickel alloy extrude tubes prepared by this comparative example is
coaxiality deviation is up to 1.0mm; The surface oxidation of GH3600 nickel alloy extrude tubes prepared by this comparative example is obvious, the blemish such as visual existence extruding ditch bar, cracking, peeling.
The yield rate of GH3600 nickel alloy extrude tubes prepared by this comparative example, grain size number and subsequent processing operations logarithmic data are in table 1.
The Performance Detection correction data of table 1 GH3600 nickel alloy of the present invention extrude tubes
As shown in Table 1, the yield rate of GH3600 nickel alloy extrude tubes prepared by the present invention is high, grain size number is 9 ~ 10 grades, subsequent processing operations is few, meet the technical requirement of space industry GH3600 nickel alloy tubing high accuracy, high finished product rate, high structure stability, there is promotional value and significant economic benefit widely.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (6)
1. a preparation method for GH3600 nickel alloy extrude tubes, is characterized in that, the method comprises the following steps:
Step one, GH3600 Ni alloy ingot is carried out mechanical process, obtain the extruding ingot blank (1) that cross sectional shape is annular;
Step 2, be not more than 1 × 10 in vacuum
-1in the vacuum welding equipment of Pa, all adopt copper tube (2) to carry out involucrum the surfaces externally and internally extruding ingot blank (1) described in step one, obtain involucrum ingot blank; The shell thickness of extruding ingot blank (1) inner surface and the shell thickness of extruding ingot blank (1) outer surface are 1mm ~ 2mm;
Step 3, the ingot blank of involucrum described in step 2 is heated to 930 DEG C ~ 960 DEG C after be incubated, then utilize extruder to insulation after involucrum ingot blank carry out Isothermal Extrusion, obtain extrusion tube blank; The extrusion ratio of described Isothermal Extrusion is 10 ~ 15, and the extruding rate of described Isothermal Extrusion is 1mm/s ~ 2mm/s;
Step 4, extrusion tube blank described in step 3 is carried out straightening processing;
Step 5, the extrusion tube blank in step 4 after straightening processing is placed in nitric acid pickling and removes surfaces externally and internally involucrum, obtain GH3600 nickel alloy extrude tubes; The internal diameter of described GH3600 nickel alloy extrude tubes is 18mm ~ 22mm, and the external diameter of described GH3600 nickel alloy extrude tubes is 28mm ~ 34mm.
2. the preparation method of a kind of GH3600 nickel alloy extrude tubes according to claim 1, it is characterized in that, the temperature retention time t be incubated described in step 3 meets: 0.8d≤t≤1.2d, and wherein d is the external diameter of involucrum ingot blank, the unit of d is the unit of mm, t is min.
3. the preparation method of a kind of GH3600 nickel alloy extrude tubes according to claim 1, it is characterized in that, the material of the recipient in extruder described in step 3, pressure ram and squeezing needle is K403 nickel alloy; The material of extrusion die is silicon carbide-based cermet or boron nitride-base cermet.
4. the preparation method of a kind of GH3600 nickel alloy extrude tubes according to claim 1 or 3, it is characterized in that, before Isothermal Extrusion is carried out to the involucrum ingot blank after insulation, need, first by the preheating temperature to 930 of the recipient in extruder DEG C ~ 960 DEG C, the temperature of pressure ram, squeezing needle and extrusion die to be all preheated to 850 DEG C ~ 870 DEG C.
5. the preparation method of a kind of GH3600 nickel alloy extrude tubes according to claim 1, it is characterized in that, the glacing flatness of the extrusion tube blank in step 4 after straightening processing is not more than 3mm/m.
6. the preparation method of a kind of GH3600 nickel alloy extrude tubes according to claim 1, is characterized in that, the mass percent concentration of nitric acid described in step 5 is 40% ~ 68%.
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| WO2009142228A1 (en) * | 2008-05-22 | 2009-11-26 | 住友金属工業株式会社 | High-strength ni-base alloy pipe for use in nuclear power plants and process for production thereof |
| CN101985678B (en) * | 2010-12-03 | 2012-05-23 | 西安诺博尔稀贵金属材料有限公司 | Method for preparing austenitic stainless steel tube blank for nuclear power |
| JP2013100584A (en) * | 2011-11-09 | 2013-05-23 | Nippon Steel & Sumitomo Metal Corp | Nickel-based alloy tube having excellent hot extrusion property and method of manufacturing the same |
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