CN106583491A - Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube - Google Patents
Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube Download PDFInfo
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- CN106583491A CN106583491A CN201611204238.1A CN201611204238A CN106583491A CN 106583491 A CN106583491 A CN 106583491A CN 201611204238 A CN201611204238 A CN 201611204238A CN 106583491 A CN106583491 A CN 106583491A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, rods or tubes
- B21C23/085—Making tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating extruded work or parts of the extrusion press
- B21C29/003—Cooling or heating of work
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- Crystallography & Structural Chemistry (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a method for manufacturing a Cr-Ni-Mo-Nb nickel base alloy seamless tube. The method includes the steps of (1) tube blank forging, (2) blank preparation, (3) hot extrusion, (4) cold working and (5) heat treatment. By the adoption of the method, the hot extrusion and cold working deformation technological parameters of the alloy tube are made as for tube blank forging, and the problem of cracking (especially the problem of hot extrusion layering) in cold and hot rolling deformation zones of the steel tube is solved; and the structural transformation rule of nickel base alloy is studied, and the heat treatment intermetallic precipitated phase problem of the alloy seamless tube is also solved.
Description
Technical field
The present invention relates to a kind of manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe, belongs to nickel-base alloy and prepares skill
Art field.
Background technology
With the development of modern industry, increasingly harsh to the demand of material, traditional rustless steel（304、316）And ferrum is Ni-based resistance to
Erosion alloy（N08020, N08028, N08825 etc.）Production requirement cannot have been met.For this purpose, increasing corrosion resistant alloy constituent content
To improve anti-corrosion and high-temperature behavior.The alloying element that generally Ni, Cr, Mo, Nb are normally added into.Anti-corrosion conjunction involved by this patent
Gold is a kind of all very high alloy of Ni, Cr, Mo, Nb alloy content, and the ratio shared by alloying element has reached more than 90%.Accurately
Say, the alloy is typical high-temperature nickel-based corrosion resistant alloy N06625.
It is strong second that N06625 alloy Mo contents have reached more than 8%, Nb elements and also reached more than 4%, Mo and Nb
Phase formation element, produces substantial amounts of intermetallic phase in causing alloy, on the one hand the Deformation Resistance of the alloy is very big, is common
Stainless more than two times, on the other hand, substantial amounts of alloying element reduces the moulding of material, makes the cold and hot working performance of material
There is very big difference compared with rustless steel.
For the alloy, the process of tubulation generally needs to produce for large-tonnage extruder.In the past, the alloy made
With being generally all import.In recent years, domestic enterprise has successively bought more than 6000 tons of horizontal extruder 3, is to produce the conjunction
Gold provides equipment guarantee.However, the problem of hot extrusion process is a lot.It is mainly manifested in that the vexed car of extruding is more, lamination is more（Mesh
It is front not yet to form consensus and solution both at home and abroad）, annoying every technical performance index of the alloy.
The content of the invention
The present invention is intended to provide a kind of manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe, for the alloy production
Common problem has carried out careful research and has improved, and has formulated from hot-working to cold worked a complete set of Technology, it is ensured that
The smooth production of the alloy.
The invention provides a kind of manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe, for forging pipe, formulates
The compo pipe hot extrusion, cold deformation technological parameter, solve steel pipe in hot and cold contact in rolling problem of Cracking, especially
It is the problem of hot extrusion layering；The nickel-base alloy structural transformation rule is have studied, the alloy seamless pipe heat-treated metal is solved
Between precipitated phase problem.The flow process and parameter of this manufacturing process is the key technology for producing the alloy pipe, is to need to be protected
's.
The present invention have studied N06625 nickel-based alloy pipe hot extrusions, steel pipe cold working, Technology for Heating Processing, key process parameter
It is as follows：
Hot-working：Extrusion temperature, extrusion ratio, extrusion speed, induction furnace heating technique；
Cold working：Deflection, mill speed, feed or cold rolling, cold-drawn；
Heat treatment：Temperature, temperature retention time, the type of cooling；
By the key parameter for studying above-mentioned technique, the nickel-base alloy all fronts production technology difficult problem is finally solved, product are completed
Kind producing in serial form, product external diametrical extent is 19 ~ 426mm, and performance meets seamless pipe standards and requires.
The invention provides a kind of manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe, including following steps successively
Suddenly：
(1) forge pipe
Pipe composition is as follows：
0 ＜ C≤0.015%, 0 ＜ Si≤0.50%, 0 ＜ Mn≤0.50%, 0 ＜ P≤0.015%, 0 ＜ S≤0.015%, 20.0%≤
Cr≤23.0%, 3.15%≤Nb+Ta≤4.15%, 0 ＜ Co≤1.0%, 0 ＜ Al≤0.40%, 0 ＜ Ti≤0.40%, 0 ＜ Fe≤
5.0%, 8.0%≤Mo≤10.0%, Ni >=58%, remaining is micro other impurity elements；
Smelting is finished and is molded into circular pipe blank；A diameter of 219-400mm of pipe, forging ratio more than 2.
（2）Blank prepares
By blank billet-sawn to 500～1000mm, depth drill processing Φ 40～Φ 100mm central through holes；
(3) hot extrusion
1. blank preheating：Blank is preheated in annular furnace, and annular furnace temperature setting is 900 ~ 1000 DEG C, and the time in stove is 1min/
Mm, accordingly increased with the external diameter increase time in stove；
2. a sensing heating：Blank is put into intermediate frequency furnace sensing heating, and induction heating temperature is set as 1100 ± 10 DEG C, protects
The warm time is 1～3min, and heating power is 600～650kW, is incubated power≤200kW；
3. glass dust lubricates：The inside and outside wall of blank is lubricated using the glass dust of molten state under high temperature；
4. reaming：Reaming is carried out using rose bit；
5. secondary sensing heating：Secondary sensing is crucial heating process, and whether direct relation the matter for extruding tubing to heats
Amount level.Blank is put into intermediate frequency furnace sensing heating, and sensing heating is segmented into 3 times, and heating target temperature is set as 1180 ±
10℃（First paragraph heating target temperature sets 1120 ± 10 DEG C, and heating finishes and 1min is stopped in stove；Second segment heats target temperature
Degree is set as 1150 ± 10 DEG C, and heating finishes and 1min is stopped in stove；3rd section of heating setpoint is 1180 ± 10 DEG C, temperature retention time
For 1min）, heating process avoids direct target setting temperature（Eliminate the thermal inertia of high-power heating）, every section of heating power is
600～650kW, is incubated power≤200kW；
6. hot extrusion：Using the hot extrusion tool and mould of suitable dimension, the contraction percentage of area is not less than 50%, no more than 90%, after extruding
Solid solution is completed in 30s；
After hot extrusion, Jing alignings, sawing, pickling proceed to cold working operation successively；
Extrusion ratio is determined by billet size, squeezing needle size, extrusion die size；Need to be selected according to the dimensional requirement of finished product tubing
Blank specification and tool and mould size.
After hot extrusion, Jing alignings, sawing, pickling proceed to cold working operation successively；
（4）Cold working
Cold working mode has two kinds：Cold rolling, cold-drawn；
1. cold-rolling process parameter setting：Reducing rate：10～40%；Wall cut rate：10～50%；Feed 4～6mm/ time；Rolling number of times
20-60 time/min.
2. cold-drawn is divided to expanding and two kinds of tube reducing：Generally expanding is 10～40mm/ passages, 0.2～0.5mm of wall thickness reduction；Subtract
Footpath be 5～10mm/ passages, 1～1.5mm of wall thickness reduction.
After cold working, Jing defats, heat treatment, aligning, sawing, pickling proceed to finished product process or lower passage cold working work successively
Sequence；
（5）Heat treatment
Steel pipe after cold working is both needed to carry out heat treatment, and heat treatment is divided into semi-finished product and two kinds of Technologies for Heating Processing of finished product；Heat treatment
Solid solution is completed in 20s afterwards.
Cr-Ni-Mo-Nb nickel-base alloy seamless pipe main components are consisted of：20.0%≤Cr≤23.0%, Ni >=58%, 8.0%
≤ Mo≤10.0%, 3.15%≤Nb+Ta≤4.15%.
In such scheme, step（3）In hot extrusion process, the temperature of the molten glass powder is 1100～1250 DEG C.
In such scheme, step（3）In hot extrusion process, arranging annular furnace temperature is：1000±10℃；Using reaming
Bore and be：80～250mm of Φ；The hot-extrusion mold for adopting for：Φ 114 × 10～Φ, 325 × 40mm, the contraction percentage of area are not less than
50%, less than 90%；After hot extrusion, the external diametrical extent of steel pipe is 114～325mm of Φ, and tolerance is ± 2mm；Wall thickness range be 10～
40mm, wall thickness tolerance ± 1mm.
In such scheme, step（5）In heat treatment process, the heat treatment temperature of semi-finished product is 1160～1180 DEG C, insulation
Time 3min/mm；Finished product heat treatment temperature is 1100～1150 DEG C, temperature retention time 2min/mm.
In such scheme, step（4）With（5）Described in cold working and Technology for Heating Processing step, alternately repeatedly, i.e.,
Including first time semi-finished product are cold rolling, first time semi-finished product heat treatment, second semi-finished product are cold rolling, at second semi-finished product heat
Reason ... n-th finished product heat treatment；Wherein n is the positive integer more than 1.
In such scheme, step（4）With（5）Described in cold working and Technology for Heating Processing step, alternately repeatedly, and
After each cold working and heat treatment, also including cold chambering process step.
Beneficial effects of the present invention：
（1）Processing technique：The seamless production technology in all fronts of extruding+cold rolling (pulling out)+solid solution is formulated, nickel-base alloy can have been produced
N06625 alloy seamless steel pipes；
（2）Solid solubility temperature：High temperature solid solution technique is employed, grain size can be controlled at 4～7 grades and crystal boundary is separated out without σ phases, while
Mechanical performance index requires to be higher by more than 5% compared with standard；
（3）Using high annular furnace preheating temperature, while targetedly flow scheme improvements have been carried out to line-frequency induction heating process, keep away
Exempt from thermal inertia to cause to extrude lamination problem；
（4）Using the cold working mode of first cold rolling rear reaming, heavy caliber is produced（External diameter 219-426mm）, thin-walled（4-6mm）'s
Nickel-base alloy seamless pipe, overcome heavy-calibre nickel base alloy thick-walled pipe cannot drawing deformation a difficult problem.
Description of the drawings
Structure and use state schematic diagram of the Fig. 1 for hot extrusion tool and mould.
In figure, 1 is pressure ram, and 2 is recipient, and 3 is blank, and 4 is extrusion die, and 5 is squeezing needle, and 6 is die-cushion, and 7 is die holder, 8
For tubing.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following examples.
Embodiment 1：
It is as follows for trimmed size Φ 25 × 2mm design process flows：
Pipe prepares（Φ219mm）→ hot extrusion（Φ140×12mm）→ aligning → sawing → pickling → cold rolling（Φ114×
10mm）→ defat → heat treatment → aligning → sawing → pickling → cold rolling（Φ89×7mm）→ defat → heat treatment → aligning →
Sawing → pickling → cold rolling（Φ57×5mm）→ defat → heat treatment → aligning → sawing → pickling → cold rolling（Φ38×3mm）
→ defat → heat treatment → aligning → sawing → pickling → cold rolling（Φ25×2mm）→ defat → heat treatment → aligning → sawing →
Pickling → flaw detection → warehouse-in
Concrete technology flow process is as follows：
(1) pipe
Using forging, car light pipe, specification is Φ 219mm.Pipe composition is as follows：
(2) blank prepares
Pipe after forging is sawed into into the blank of 650mm/, central through hole is Φ 60mm.
（3）Hot extrusion
1. blank preheating：Blank is preheated in annular furnace, 996 DEG C of annular furnace tapping temperature, the 219min of time in stove；
2. a sensing heating：Blank is put into intermediate frequency furnace sensing heating, and heating power is 620kW, is incubated power 130kW,
Temperature retention time 2min, infrared radiation thermometer show 1103 DEG C of blank external skin temperatures, 1105 DEG C of interior table temperature；
3. glass dust lubricates：The inside and outside wall of blank is lubricated using 1100～1250 DEG C of molten glass powder；
4. reaming：Reaming is carried out using the rose bit of Φ 125mm；
5. secondary sensing heating：Blank is put into intermediate frequency furnace sensing heating, and first time heating power is 610kW, is incubated power
100kW, cuts off induction furnace, does not come out of the stove, temperature retention time 1min, and infrared radiation thermometer shows 1125 DEG C of blank external skin temperatures, Nei Biaowen
1128 DEG C of degree；Second heating power is 610kW, is incubated power 100kW, cuts off induction furnace, do not come out of the stove, temperature retention time 1min,
Infrared radiation thermometer shows 1155 DEG C of blank external skin temperatures, 1156 DEG C of interior table temperature；Third time heating power is 610kW, is incubated work(
Rate 100kW, cuts off induction furnace, does not come out of the stove, temperature retention time 1min, and infrared radiation thermometer shows 1185 DEG C of blank external skin temperatures, interior table
1188 DEG C of temperature；
6. hot extrusion：Hot extrusion tool and mould of the hot extrusion using 140 × 12mm of Φ, shape and schematic diagram are shown in Fig. 1, the contraction percentage of area
84%, after extruding, 20s completes solid solution；
Fig. 1 shows the outfit of tool and mould and use state, and extrusion die 4 is exported positioned at recipient 2, work of the blank 3 in extrusion die 4
Lower section shrinkage is used, 8 semi-finished product of tubing are formed.Extrusion die 4 is fixed on die holder 7 by die-cushion 6.
After hot extrusion, the outside dimension of steel pipe is 140.8mm, and wall thickness is 12.5mm.After extruding successively Jing alignings, pickling, repair
Mill.
（4）First time semi-finished product are cold rolling
Required according to trimmed size, the cold-rolling process of first time semi-finished product is：140 × 12mm of Φ → 114 × 10mm of Φ, after rolling
External diameter 114.1mm, wall thickness 10.2mm, reducing rate 18.57%, wall cut rate 16.67%, feed 4mm/ time, rolling number of times 50 times/
min。
Steel pipe after cold rolling, Jing defats carry out heat treatment；
（5）First time semi-finished product heat treatment
At 1170 ± 10 DEG C, temperature retention time control is 1175～1178 in 30min, actual measurement furnace temperature to the control of semi-finished product heat treatment temperature
Between DEG C；
After heat treatment, 15s enters water solid solution；
Jing alignings, pickling, that reconditioning carries out the second passage semi-finished product is cold rolling.
（6）Second semi-finished product is cold rolling
Required according to trimmed size, the cold-rolling process of second semi-finished product is：114 × 10mm of Φ → 89 × 7mm of Φ, it is outer after rolling
Footpath 89.2mm, wall thickness 7.1mm, reducing rate 21.93%, wall cut rate 30%, feed 4mm/ time roll 55 times/min of number of times.
Steel pipe after cold rolling, Jing defats carry out heat treatment；
（7）Second semi-finished product heat treatment
At 1170 ± 10 DEG C, temperature retention time control is 1172～1175 in 21min, actual measurement furnace temperature to the control of semi-finished product heat treatment temperature
Between DEG C；
After heat treatment, 15s enters water solid solution；
Jing alignings, pickling, that reconditioning carries out the 3rd passage semi-finished product is cold rolling.
（8）Third time semi-finished product are cold rolling
Required according to trimmed size, the cold-rolling process of third time semi-finished product is：89 × 7mm of Φ → 57 × 5mm of Φ, external diameter after rolling
57.1mm, wall thickness 5.0mm, reducing rate 35.96%, wall cut rate 28.57%, feed 5mm/ time roll 55 times/min of number of times.
Steel pipe after cold rolling, Jing defats carry out heat treatment；
（9）Third time semi-finished product heat treatment
At 1170 ± 10 DEG C, temperature retention time control is 1175～1178 in 15min, actual measurement furnace temperature to the control of semi-finished product heat treatment temperature
Between DEG C；
After heat treatment, 15s enters water solid solution；
Jing alignings, pickling, that reconditioning carries out four-pass semi-finished product is cold rolling.
（10）4th time semi-finished product are cold rolling
Required according to trimmed size, the cold-rolling process of the 4th semi-finished product is：57 × 5mm of Φ → 38 × 3mm of Φ, external diameter after rolling
38.1mm, wall thickness 3.05mm, reducing rate 33.33%, wall cut rate 40%, feed 4mm/ time roll 55 times/min of number of times.
Steel pipe after cold rolling, Jing defats carry out heat treatment；
（11）4th semi-finished product heat treatment
At 1170 ± 10 DEG C, temperature retention time control is 1175～1180 in 9min, actual measurement furnace temperature to the control of semi-finished product heat treatment temperature
Between DEG C；
After heat treatment, 15s enters water solid solution；
Jing alignings, pickling, that reconditioning carries out finished product is cold rolling.
（12）5th time semi-finished product are cold rolling
The cold-rolling process for requiring the 5th semi-finished product according to trimmed size is：38 × 3mm of Φ → 25 × 2mm of Φ, external diameter after rolling
25.1mm, wall thickness 2.0mm, reducing rate 34.21%, wall cut rate 33.33%, feed 4mm/ time roll 60 times/min of number of times.
Steel pipe after cold rolling, Jing defats carry out heat treatment；
（13）5th final pass heat treatment
The control of final pass heat treatment temperature at 1120 ± 10 DEG C, temperature retention time control in 4min, actual measurement furnace temperature is 1125～
Between 1128 DEG C；
After heat treatment, 15s enters water solid solution；
Jing alignings, pickling are finished product.
（14）Nondestructive inspection
By ASME E213《Metal nominal pipe and the practical code of pipe ultrasonic inspection》Ultrasonic examination is carried out, II grade qualified.
（15）Service check
Fished pipe takes two and carries out service check, as a result as follows：
Service check fully meets standard ASME SB444 and user requires, yield strength 25-30% high compared with standard, tensile strength
11-13% high compared with standard, elongation percentage 65-70% high compared with standard.
Embodiment 2
It is as follows for trimmed size Φ 250 × 8mm design process flows：
Raw material prepares（Φ306mm）→ hot extrusion（Φ194×22mm）→ aligning → sawing → pickling → reconditioning → lubrication → cold
Roll（Φ168×15mm）→ defat → heat treatment → aligning → sawing → pickling → lubrication → cold expansion（Φ250×14mm）→ de-
Fat → heat treatment → aligning → sawing → pickling → lubrication → cold rolling（Φ219×8mm）→ defat → heat treatment → aligning → saw
Cut → pickling → lubrication → cold expansion（Φ250×8mm）→ defat → heat treatment → aligning → sawing → pickling → flaw detection → warehouse-in
Concrete technology flow process is as follows：
（1）Pipe
Using forging pipe, pipe specification is Φ 306mm.Pipe composition such as following table.
（2）Blank prepares
Pipe after forging is sawed into into the blank of 600mm/, central through hole is Φ 80mm.
(3) hot extrusion
1. blank preheating：Blank is preheated in annular furnace, 1000 DEG C of annular furnace tapping temperature, the 306min of time in stove；
2. a sensing heating：Blank is put into intermediate frequency furnace sensing heating, and heating power is 650kW, is incubated power 150kW,
Temperature retention time 2min, infrared radiation thermometer show 1108 DEG C of blank external skin temperatures, 1101 DEG C of interior table temperature；
3. glass dust lubricates：The inside and outside wall of blank is lubricated using 1100～1250 DEG C of molten glass powder；
4. reaming：Reaming is carried out using the rose bit of Φ 165mm；
5. secondary sensing heating：Blank is put into intermediate frequency furnace sensing heating, and first time heating power is 650kW, is incubated power
100kW, cuts off induction furnace, does not come out of the stove, temperature retention time 1min, and infrared radiation thermometer shows 1122 DEG C of blank external skin temperatures, Nei Biaowen
1126 DEG C of degree；Second heating power is 650kW, is incubated power 100kW, cuts off induction furnace, do not come out of the stove, temperature retention time 1min,
Infrared radiation thermometer shows 1150 DEG C of blank external skin temperatures, 1152 DEG C of interior table temperature；Third time heating power is 610kW, is incubated work(
Rate 100kW, cuts off induction furnace, does not come out of the stove, temperature retention time 1min, and infrared radiation thermometer shows 1182 DEG C of blank external skin temperatures, interior table
1187 DEG C of temperature；
6. hot extrusion：Hot extrusion tool and mould of the hot extrusion using 194 × 22mm of Φ, shape and schematic diagram are shown in Fig. 1, the contraction percentage of area
81.06%, after extruding, 30s completes solid solution；
Fig. 1 shows the outfit of tool and mould and use state, and extrusion die 4 is exported positioned at recipient 2, work of the blank 3 in extrusion die 4
Lower section shrinkage is used, 8 semi-finished product of tubing are formed.Extrusion die 4 is fixed on die holder 7 by die-cushion 6.
After hot extrusion, the outside dimension of steel pipe is 194.5mm, and wall thickness is 22.8mm.After extruding successively Jing alignings, pickling, repair
Mill.
（4）First time semi-finished product are cold rolling
Required according to trimmed size, the cold-rolling process of first time semi-finished product is：194 × 22mm of Φ → 168 × 15mm of Φ, after rolling
External diameter 168.5mm, wall thickness 15.2mm, reducing rate 13.40%, wall cut rate 31.82%, feed 4mm/ time, rolling number of times 30 times/
min。
Steel pipe after cold rolling, Jing defats carry out heat treatment；
（5）First time semi-finished product heat treatment
At 1170 ± 10 DEG C, temperature retention time control is 1175～1178 in 45min, actual measurement furnace temperature to the control of semi-finished product heat treatment temperature
Between DEG C；
After heat treatment, 15s enters water solid solution；
Cold reaming is carried out Jing after aligning, pickling, reconditioning, lubrication.
（6）Cold reaming
Cold reaming is carried out using internal model of the specification for Φ 150mm, internal model material is YG8, expanding rear external diameter is 181.2mm, wall thickness
For 14.82mm.
Sequentially pass through defat, heat treatment, aligning, sawing, pickling, reconditioning, second expanding, internal model specification carried out after lubrication
For 170mm, material is YG8, and expanding rear external diameter is 201mm, and wall thickness is 14.5mm.Heat treatment temperature retention time 45min, surveys furnace temperature
Between 1175～1178 DEG C, after heat treatment, 15s enters water solid solution.
Sequentially pass through defat, heat treatment, aligning, sawing, pickling, reconditioning, expanding, the internal model specification of third time carried out after lubrication
For 200mm, material is YG8, and expanding rear external diameter is 328.8mm, and wall thickness is 14.2mm.Heat treatment temperature retention time 45min, surveys stove
Between 1173～1177 DEG C of temperature, after heat treatment, 15s enters water solid solution.
Sequentially pass through defat, heat treatment, aligning, sawing, pickling, reconditioning, carry out the 4th expanding, internal model specification after lubrication
For 225mm, material is YG8, and expanding rear external diameter is 252.5mm, and wall thickness is 14.0mm.Heat treatment temperature retention time 45min, surveys stove
Between 1174～1176 DEG C of temperature, after heat treatment, 15s enters water solid solution.
（7）Second semi-finished product is cold rolling
Required according to trimmed size, the cold-rolling process of second semi-finished product is：250 × 14mm of Φ → 219 × 8.5mm of Φ, rolling
External diameter 219.3mm afterwards, wall thickness 8.6mm, reducing rate 12.4%, wall cut rate 36.67%, feed 4mm/ time, rolling number of times 30 times/
min。
Steel pipe after cold rolling, Jing defats carry out heat treatment；
（8）Second semi-finished product heat treatment
At 1170 ± 10 DEG C, temperature retention time control is 1175～1178 in 26min, actual measurement furnace temperature to the control of semi-finished product heat treatment temperature
Between DEG C；
After heat treatment, 15s enters water solid solution；
Cold reaming is carried out Jing after aligning, pickling, reconditioning, lubrication.
（9）Cold reaming
Internal model specification is 233mm, and material is YG8, and after cold-drawn, external diameter is 250.1mm, and wall thickness is 8.22mm.
Finished product is through defat, heat treatment, aligning, sawing, pickling after cold-drawn.Perform finished product Technology for Heating Processing, insulation
Time 16min, surveys 1111～1115 DEG C of furnace temperature, and after heat treatment, 15s enters water solid solution.
（10）Nondestructive inspection
By ASME E213《Metal nominal pipe and the practical code of pipe ultrasonic inspection》Ultrasonic examination is carried out, II grade qualified.
（11）Service check
Fished pipe takes two and carries out service check, as a result as follows：
Service check fully meets standard ASME SB444 and user requires.Yield strength 20-25% high compared with standard, tensile strength
5-7% high compared with standard, elongation percentage 70-72% high compared with standard.
Claims (8)
1. a kind of manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe, including hot extrusion, steel pipe cold working, heat treatment work
Skill, it is characterised in that：Comprise the following steps：
(1) forge pipe
Pipe composition is as follows：
0 ＜ C≤0.015%, 0 ＜ Si≤0.50%, 0 ＜ Mn≤0.50%, 0 ＜ P≤0.015%, 0 ＜ S≤0.015%, 20.0%≤
Cr≤23.0%, 3.15%≤Nb+Ta≤4.15%, 0 ＜ Co≤1.0%, 0 ＜ Al≤0.40%, 0 ＜ Ti≤0.40%, 0 ＜ Fe≤
5.0%, 8.0%≤Mo≤10.0%, Ni >=58%, remaining is micro other impurity elements；
Smelting is finished and is molded into round billet；
（2）Blank prepares
By blank billet-sawn to 500～1000mm, depth drill processing Φ 40～Φ 100mm central through holes；
(3) hot extrusion
1. blank preheating：Blank is preheated in annular furnace, and annular furnace temperature setting is 900 ~ 1000 DEG C, and the time in stove is 1min/
Mm, accordingly increased with the external diameter increase time in stove；
2. a sensing heating：Blank is put into intermediate frequency furnace sensing heating, and induction heating temperature is set as 1100 ± 10 DEG C, protects
The warm time is 1～3min, and heating power is 600～650kW, is incubated power≤200kW；
3. glass dust lubricates：The inside and outside wall of blank is lubricated using the glass dust of molten state under high temperature；
4. reaming：Reaming is carried out using rose bit；
5. secondary sensing heating：Blank is put into intermediate frequency furnace sensing heating, and sensing heating is divided into 3 sections, and heating target temperature sets
It is set to 1180 ± 10 DEG C, heating process avoids direct target setting temperature, every section of heating power is 600～650kW, is incubated power
≤200kW；
6. hot extrusion：Using hot extrusion tool and mould, the contraction percentage of area is not less than 50%, no more than 90%, completes solid after extruding in 30s
It is molten；
After hot extrusion, Jing alignings, sawing, pickling proceed to cold working operation successively；
（4）Cold working
Cold working mode has two kinds：Cold rolling, cold-drawn；
1. cold-rolling process parameter setting：Reducing rate：10～40%；Wall cut rate：10～50%；Feed 4～6mm/ time；Rolling number of times
20-60 time/min；
2. cold-drawn is divided to expanding and two kinds of tube reducing：Generally expanding is 10～40mm/ passages, 0.2～0.5mm of wall thickness reduction；Tube reducing is 5
～10mm/ passages, 1～1.5mm of wall thickness reduction；
After cold working, Jing defats, heat treatment, aligning, sawing, pickling proceed to finished product process or lower passage cold working operation successively；
（5）Heat treatment
Steel pipe after cold working is both needed to carry out heat treatment, and heat treatment is divided into semi-finished product and two kinds of Technologies for Heating Processing of finished product；Heat treatment
Solid solution is completed in 20s afterwards.
2. the manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe according to claim 1, it is characterised in that：It is described
Step（1）A diameter of 219-400mm of pipe, forging ratio more than 2.
3. the manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe according to claim 1, it is characterised in that：It is described
Step（2）Secondary sensing heating during, first paragraph heating target temperature sets 1120 ± 10 DEG C, and heating is finished and stopped in stove
Stay 1min；Second segment heating target temperature is set as 1150 ± 10 DEG C, and heating finishes and 1min is stopped in stove；3rd section of heating sets
It is set to 1180 ± 10 DEG C, temperature retention time is 1min.
4. the manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe according to claim 1, it is characterised in that：Step
（3）In hot extrusion process, the temperature of the molten glass powder is 1100～1250 DEG C.
5. the manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe according to claim 1, it is characterised in that：Step
（3）In hot extrusion process, arranging annular furnace temperature is：1000±10℃；The rose bit for adopting for：80～250mm of Φ；Using
Hot-extrusion mold is：Φ 114 × 10～Φ, 325 × 40mm, the contraction percentage of area are not less than 50%, less than 90%；Steel after hot extrusion
The external diametrical extent of pipe is 114～325mm of Φ, and tolerance is ± 2mm；Wall thickness range is 10～40mm, wall thickness tolerance ± 1mm.
6. the manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe according to claim 1, it is characterised in that：Step
（5）In heat treatment process, the heat treatment temperature of semi-finished product is 1160～1180 DEG C, temperature retention time 3min/mm；Finished product heat treatment temperature
Spend for 1100～1150 DEG C, temperature retention time 2min/mm.
7. the manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe according to claim 1, it is characterised in that：Step
（4）With（5）Described in cold working and Technology for Heating Processing step, alternately repeatedly, i.e., including first time semi-finished product it is cold rolling,
Semi-finished product heat treatment, second semi-finished product are cold rolling, second semi-finished product heat treatment ... n-th finished product heat treatment；Wherein n
It is the positive integer more than 1.
8. the manufacture method of Cr-Ni-Mo-Nb nickel-base alloys seamless pipe according to claim 1, it is characterised in that：Step
（4）With（5）Described in cold working and Technology for Heating Processing step, alternately repeatedly, and every time after cold working and heat treatment, also
Including cold chambering process step.
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