CN106583491B - A kind of manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe - Google Patents

A kind of manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe Download PDF

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CN106583491B
CN106583491B CN201611204238.1A CN201611204238A CN106583491B CN 106583491 B CN106583491 B CN 106583491B CN 201611204238 A CN201611204238 A CN 201611204238A CN 106583491 B CN106583491 B CN 106583491B
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finished
heat treatment
cold
temperature
heating
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CN106583491A (en
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聂飞
付俊生
巩非
张琳
李鹏
拓雷锋
范晔峰
程逸明
侯楠
梁祥祥
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山西太钢不锈钢股份有限公司
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/04Making uncoated products by direct extrusion
    • B21C23/08Making wire, bars, tubes
    • B21C23/085Making tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • B21C29/003Cooling or heating of work
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C19/00Alloys based on nickel or cobalt
    • C22C19/03Alloys based on nickel or cobalt based on nickel
    • C22C19/05Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055Alloys 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%
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/10Changing 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

Abstract

The invention discloses a kind of manufacturing methods of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe, including (1) to forge pipe;(2) blank prepares;(3) hot extrusion;(4) it is cold worked;(5) heat treatment step.The present invention has formulated the compo pipe hot extrusion, cold deformation technological parameter for forging pipe, solves steel pipe the problem of hot and cold contact in rolling problem of Cracking, especially hot extrusion are layered;The nickel-base alloy structural transformation rule is had studied, solves the problems, such as precipitated phase between the alloy seamless pipe heat-treated metal.

Description

A kind of manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe

Technical field

The present invention relates to a kind of manufacturing methods of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe, belong to nickel-base alloy preparation skill Art field.

Background technique

With the development of modern industry, the demand to material is increasingly harsh, and traditional stainless steel (304,316) and iron are Ni-based resistance to Erosion alloy (N08020, N08028, N08825 etc.) can no longer meet production requirement.For this purpose, increasing corrosion resistant alloy constituent content To improve anti-corrosion and high-temperature behavior.The alloying element that usual Ni, Cr, Mo, Nb are normally added into.Anti-corrosion conjunction involved in this patent Gold is a kind of all very high alloy of Ni, Cr, Mo, Nb alloy content, and ratio shared by alloying element has reached 90% or more.Accurately Say that the alloy is typical high-temperature nickel-based corrosion resistant alloy N06625 in ground.

N06625 alloy Mo content has reached that 8% or more, Nb element has also reached 4% or more, Mo and Nb is strong second Phase formation element will lead to and generate a large amount of intermetallic phase in alloy, and it is common that on the one hand the Deformation Resistance of the alloy is very big Two times or more of stainless steel, on the other hand, a large amount of alloying element reduces the moulding of material, makes the cold and hot working performance of material There is very big difference compared with stainless steel.

For the alloy, the process of tubulation usually requires to produce for the extruder of large-tonnage.In the past, which made With being usually all import.In recent years, domestic enterprise has successively bought horizontal extruder 3 of 6000 tons or more, to produce the conjunction Gold provides equipment guarantee.However, there are many problem of hot extrusion process.It is mainly manifested in and squeezes that bored vehicle is more, the more (mesh of lamination It is preceding not yet to form consensus and solution both at home and abroad), annoying every technical performance index of the alloy.

Summary of the invention

The present invention is intended to provide a kind of manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe, for the alloy production Common problem has carried out careful research and improvement, has formulated a full set of technology from hot-working to cold working, it is ensured that The smooth production of the alloy.

The present invention provides a kind of manufacturing methods of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe to formulate for forging pipe The compo pipe hot extrusion, cold deformation technological parameter, solve steel pipe in hot and cold contact in rolling problem of Cracking, especially The problem of being hot extrusion layering;The nickel-base alloy structural transformation rule is had studied, solves the alloy seamless pipe heat-treated metal Between precipitated phase problem.The process and parameter of this manufacturing process are to produce the key technology of the alloy pipe, are to be protected 's.

The present invention has studied the hot extrusion of N06625 nickel-based alloy pipe, steel pipe cold working, heat treatment process, key process parameter It is as follows:

Hot-working: temperature, extrusion ratio, extrusion speed, induction furnace heating process are squeezed;

Cold working: deflection, mill speed, feed or cold rolling, cold-drawn;

Heat treatment: temperature, soaking time, the type of cooling;

By studying the key parameter of above-mentioned technique, finally solves the nickel-base alloy all fronts production technology problem, complete The producing in serial form of kind, product external diametrical extent are 19 ~ 426mm, and performance meets seamless pipe standard requirements.

The present invention provides a kind of manufacturing methods of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe, including following steps successively It is rapid:

(1) pipe is forged

Pipe ingredient 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, which finishes, is molded into circular pipe blank;The diameter of pipe is 219-400mm, 2 or more forging ratio.

(2) blank prepares

By blank billet-sawn to 500~1000mm, depth drill processes 40~Φ of Φ 100mm central through hole;

(3) hot extrusion

1. blank preheats: blank preheats in annular furnace, and annular furnace temperature setting is 900 ~ 1000 DEG C, and the time in furnace is 1min/mm is increase accordingly with the outer diameter increase time in furnace;

2. an induction heating: blank is put into intermediate frequency furnace induction heating, and induction heating temperature is set as 1100 ± 10 DEG C, soaking time is 1~3min, and heating power is 600~650kW, keeps the temperature power≤200kW;

3. glass powder lubricates: the inside and outside wall of blank is lubricated using the glass powder of molten state under high temperature;

4. reaming: carrying out reaming using rose bit;

5. secondary induction heating: secondary induction is crucial heating process, and heating effect whether is directly related to extruding tubing Quality level.Blank is put into intermediate frequency furnace induction heating, and induction heating is segmented into 3 times, and heating target temperature is set as 1180 ± 10 DEG C (first segment heating target temperature sets 1120 ± 10 DEG C, and heating is finished stops 1min in furnace;Second segment heating Target temperature is set as 1150 ± 10 DEG C, and heating is finished stops 1min in furnace;Third section heating setpoint is 1180 ± 10 DEG C, is protected The warm time is 1min), heating process avoids directly setting target temperature (thermal inertia for eliminating high-power heating), every section of heating function Rate is 600~650kW, keeps the temperature 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%, is not more than 90%, squeezes Solid solution is completed after pressure in 30s;

Cold working process successively is transferred to through aligning, sawing, pickling after hot extrusion;

Extrusion ratio is determined by billet size, squeezing needle size, extrusion die size;It need to be required according to the size of finished product tubing, Select blank specification and tool and mould size.

Cold working process successively is transferred to through aligning, sawing, pickling after hot extrusion;

(4) it is cold worked

There are two types of cold working modes: cold rolling, cold-drawn;

1. cold-rolling process parameter setting: reducing rate: 10~40%;Wall cut rate: 10~50%;Feed 4~6mm/ times;Rolling 20-60 times/min of number.

2. cold-drawn is divided to expanding with two kinds of tube reducing: usually expanding is 10~40mm/ passage, 0.2~0.5mm of wall thickness reduction;Subtract Diameter is 5~10mm/ passage, 1~1.5mm of wall thickness reduction.

Finished product process successively is transferred to through degreasing, heat treatment, aligning, sawing, pickling after cold working or work is cold worked in lower passage Sequence;

(5) it is heat-treated

Steel pipe after cold working is both needed to be heat-treated, and heat treatment is divided into semi-finished product and two kinds of heat treatment process of finished product;Heat Solid solution is completed after processing in 20s.

Cr-Ni-Mo-Nb nickel-base alloy seamless pipe main component composition are as follows: 20.0%≤Cr≤23.0%, Ni >=58%, 8.0% ≤ Mo≤10.0%, 3.15%≤Nb+Ta≤4.15%.

In above scheme, in step (3) hot extrusion process, the temperature of the molten glass powder is 1100~1250 DEG C.

In above scheme, in step (3) hot extrusion process, annular furnace temperature is set are as follows: 1000 ± 10 DEG C;The reaming of use Cone are as follows: 80~250mm of Φ;The hot-extrusion mold of use are as follows: Φ 114 × 10~Φ, 325 × 40mm, the contraction percentage of area are not less than 50%, it is no more than 90%;The external diametrical extent of steel pipe is 114~325mm of Φ after hot extrusion, and tolerance is ± 2mm;Wall thickness range be 10~ 40mm, wall thickness tolerance ± 1mm.

In above scheme, in step (5) heat treatment process, the heat treatment temperature of semi-finished product is 1160~1180 DEG C, heat preservation Time 3min/mm;Finished product heat treatment temperature is 1100~1150 DEG C, soaking time 2min/mm.

In above scheme, cold working described in step (4) and (5) and heat treatment process step, alternately repeatedly, i.e., At first time semi-finished product cold rolling, the heat treatment of first time semi-finished product, second of semi-finished product cold rolling, second of semi-finished product heat Reason ... n-th finished product heat treatment;Wherein n is the positive integer greater than 1.

In above scheme, cold working described in step (4) and (5) and heat treatment process step, alternately repeatedly, and It further include cold chambering process step after being cold worked and be heat-treated every time.

Beneficial effects of the present invention:

(1) processing technology: extruding+cold rolling (pulling out)+solid solution seamless production technology in all fronts has been formulated, can have been produced Ni-based Alloy N06625 alloy seamless steel pipe;

(2) solid solubility temperature: using high temperature solid solution technique, can control grain size at 4~7 grades and crystal boundary is precipitated without σ phase, Mechanical performance index is higher by 5% or more compared with standard requirements simultaneously;

(3) high annular furnace preheating temperature is used, while targetedly process has been carried out to line-frequency induction heating process and has been changed Into, avoid thermal inertia cause squeeze lamination problem;

(4) using the cold working mode of reaming after first cold rolling, heavy caliber (outer diameter 219-426mm), thin-walled (4- are produced Nickel-base alloy seamless pipe 6mm), overcome heavy-calibre nickel base alloy thick-walled pipe can not drawing deformation problem.

Detailed description of the invention

Fig. 1 is the structure and use state diagram of hot extrusion tool and mould.

1 is pressure ram in figure, and 2 be extrusion cylinder, and 3 be blank, and 4 be extrusion die, and 5 be squeezing needle, and 6 be die-cushion, and 7 be die holder, 8 For tubing.

Specific embodiment

The present invention is further illustrated below by embodiment, but is not limited to following embodiment.

Embodiment 1:

It is as follows for trimmed size Φ 25 × 2mm design process flow:

Pipe prepares (Φ 219mm) → hot extrusion (140 × 12mm of Φ) → aligning → sawing → pickling → cold rolling (Φ 114 × 10mm) → degreasing → heat treatment → aligning → sawing → pickling → cold rolling (89 × 7mm of Φ) → degreasing → heat treatment → aligning → sawing → pickling → cold rolling (57 × 5mm of Φ) → degreasing → heat treatment → aligning → sawing → pickling → cold rolling (Φ 38 × 3mm) → degreasing → heat treatment → aligning → sawing → pickling → cold rolling (25 × 2mm of Φ) → degreasing → heat treatment → aligning → saw Cut → pickling → flaw detection → storage

Concrete technology flow process is as follows:

(1) pipe

Using forging, vehicle light pipe base, specification is Φ 219mm.Pipe ingredient is as follows:

(2) blank prepares

Pipe after forging is sawed into the blank of 650mm/ branch, central through hole is Φ 60mm.

(3) hot extrusion

1. blank preheats: blank preheats in annular furnace, 996 DEG C of annular furnace tapping temperature, the 219min of time in furnace;

2. an induction heating: blank is put into intermediate frequency furnace induction heating, and heating power 620kW keeps the temperature power 130kW, soaking time 2min, infrared radiation thermometer show 1103 DEG C of blank external skin temperatures, 1105 DEG C of interior table temperature;

3. glass powder lubricates: the inside and outside wall of blank is lubricated using 1100~1250 DEG C of molten glass powder;

4. reaming: carrying out reaming using the rose bit of Φ 125mm;

5. secondary induction heating: blank is put into intermediate frequency furnace induction heating, and first time heating power is 610kW, heat preservation Power 100kW cuts off induction furnace, does not come out of the stove, soaking time 1min, 1125 DEG C of blank external skin temperatures of infrared radiation thermometer display, interior 1128 DEG C of table temperature;Second of heating power is 610kW, keeps the temperature power 100kW, cuts off induction furnace, do not come out of the stove, soaking time 1min, infrared radiation thermometer show 1155 DEG C of blank external skin temperatures, 1156 DEG C of interior table temperature;Third time heating power is 610kW, is protected Warm power 100kW, cuts off induction furnace, does not come out of the stove, soaking time 1min, and infrared radiation thermometer shows 1185 DEG C of blank external skin temperatures, 1188 DEG C of interior table temperature;

6. hot extrusion: hot extrusion uses the hot extrusion tool and mould of 140 × 12mm of Φ, and shape and schematic diagram are shown in that Fig. 1, section are received Shrinkage 84%, 20s completes solid solution after extruding;

Fig. 1 shows the outfit and use state of tool and mould, and extrusion die 4 is located at the outlet of extrusion cylinder 2, and blank 3 is in extrusion die 4 Under the action of section shrinkage, formed 8 semi-finished product of tubing.Extrusion die 4 is fixed on die holder 7 by die-cushion 6.

The outer diameter of steel pipe is 140.8mm, wall thickness 12.5mm after hot extrusion.After extruding successively through aligning, pickling, repair Mill.

(4) first time semi-finished product cold rolling

It is required according to trimmed size, the cold-rolling process of first time semi-finished product are as follows: 140 × 12mm of Φ → 114 × 10mm of Φ rolls Outer diameter 114.1mm after system, wall thickness 10.2mm, reducing rate 18.57%, wall cut rate 16.67%, feed 4mm/ times roll number 50 Secondary/min.

Steel pipe after cold rolling, is heat-treated through degreasing;

(5) first time semi-finished product are heat-treated

The control of semi-finished product heat treatment temperature at 1170 ± 10 DEG C, soaking time control in 30min, survey furnace temperature be 1175~ Between 1178 DEG C;

15s enters water solid solution after heat treatment;

The second passage semi-finished product cold rolling is carried out through aligning, pickling, reconditioning.

(6) second of semi-finished product cold rolling

It is required according to trimmed size, the cold-rolling process of second of semi-finished product are as follows: 114 × 10mm of Φ → 89 × 7mm of Φ, rolling Outer diameter 89.2mm afterwards, wall thickness 7.1mm, reducing rate 21.93%, wall cut rate 30%, feed 4mm/ times roll 55 times/min of number.

Steel pipe after cold rolling, is heat-treated through degreasing;

(7) second of semi-finished product heat treatment

The control of semi-finished product heat treatment temperature at 1170 ± 10 DEG C, soaking time control in 21min, survey furnace temperature be 1172~ Between 1175 DEG C;

15s enters water solid solution after heat treatment;

The semi-finished product cold rolling of third passage is carried out through aligning, pickling, reconditioning.

(8) third time semi-finished product cold rolling

It is required according to trimmed size, the cold-rolling process of third time semi-finished product are as follows: 89 × 7mm of Φ → 57 × 5mm of Φ, after rolling Outer diameter 57.1mm, wall thickness 5.0mm, reducing rate 35.96%, wall cut rate 28.57%, feed 5mm/ times roll 55 times/min of number.

Steel pipe after cold rolling, is heat-treated through degreasing;

(9) third time semi-finished product are heat-treated

The control of semi-finished product heat treatment temperature at 1170 ± 10 DEG C, soaking time control in 15min, survey furnace temperature be 1175~ Between 1178 DEG C;

15s enters water solid solution after heat treatment;

The cold rolling of four-pass semi-finished product is carried out through aligning, pickling, reconditioning.

(10) the 4th semi-finished product cold rollings

It is required according to trimmed size, the cold-rolling process of the 4th semi-finished product are as follows: 57 × 5mm of Φ → 38 × 3mm of Φ, after rolling Outer diameter 38.1mm, wall thickness 3.05mm, reducing rate 33.33%, wall cut rate 40%, feed 4mm/ times roll 55 times/min of number.

Steel pipe after cold rolling, is heat-treated through degreasing;

(11) the 4th semi-finished product heat treatment

The control of semi-finished product heat treatment temperature at 1170 ± 10 DEG C, soaking time control in 9min, survey furnace temperature be 1175~ Between 1180 DEG C;

15s enters water solid solution after heat treatment;

Finished product cold rolling is carried out through aligning, pickling, reconditioning.

(12) the 5th semi-finished product cold rollings

The cold-rolling process of the 5th semi-finished product is required according to trimmed size are as follows: 38 × 3mm of Φ → 25 × 2mm of Φ, after rolling Outer diameter 25.1mm, wall thickness 2.0mm, reducing rate 34.21%, wall cut rate 33.33%, feed 4mm/ times roll 60 times/min of number.

Steel pipe after cold rolling, is heat-treated through degreasing;

(13) the 5th final pass heat treatment

The control of final pass heat treatment temperature is at 1120 ± 10 DEG C, and in 4min, surveying furnace temperature is 1125 for soaking time control Between~1128 DEG C;

15s enters water solid solution after heat treatment;

It is finished product through aligning, pickling.

(14) nondestructive inspection

By ASME E213 " the practical regulation of metal nominal pipe and pipe ultrasonic inspection " carry out ultrasonic examination, II grade It is qualified.

(15) service check

Fished pipe takes two progress service checks, as a result as follows:

Service check fully meets standard ASME SB444 and user requires, yield strength 25-30% high compared with standard, tension Intensity 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 flow:

Raw material preparation (Φ 306mm) → hot extrusion (194 × 22mm of Φ) → aligning → sawing → pickling → reconditioning → lubrication → cold rolling (168 × 15mm of Φ) → degreasing → heat treatment → aligning → sawing → pickling → lubrication → cold expansion (250 × 14mm of Φ) → degreasing → heat treatment → aligning → sawing → pickling → lubrication → cold rolling (219 × 8mm of Φ) → degreasing → heat treatment → aligning → sawing → pickling → lubrication → cold expansion (250 × 8mm of Φ) → degreasing → heat treatment → aligning → sawing → pickling → flaw detection → Storage

Concrete technology flow process is as follows:

(1) pipe

Using forging pipe, pipe specification is Φ 306mm.Pipe ingredient such as following table.

(2) blank prepares

Pipe after forging is sawed into the blank of 600mm/ branch, central through hole is Φ 80mm.

(3) hot extrusion

1. blank preheats: blank preheats in annular furnace, 1000 DEG C of annular furnace tapping temperature, the 306min of time in furnace;

2. an induction heating: blank is put into intermediate frequency furnace induction heating, and heating power 650kW keeps the temperature power 150kW, soaking time 2min, infrared radiation thermometer show 1108 DEG C of blank external skin temperatures, 1101 DEG C of interior table temperature;

3. glass powder lubricates: the inside and outside wall of blank is lubricated using 1100~1250 DEG C of molten glass powder;

4. reaming: carrying out reaming using the rose bit of Φ 165mm;

5. secondary induction heating: blank is put into intermediate frequency furnace induction heating, and first time heating power is 650kW, heat preservation Power 100kW cuts off induction furnace, does not come out of the stove, soaking time 1min, 1122 DEG C of blank external skin temperatures of infrared radiation thermometer display, interior 1126 DEG C of table temperature;Second of heating power is 650kW, keeps the temperature power 100kW, cuts off induction furnace, do not come out of the stove, soaking time 1min, infrared radiation thermometer show 1150 DEG C of blank external skin temperatures, 1152 DEG C of interior table temperature;Third time heating power is 610kW, is protected Warm power 100kW, cuts off induction furnace, does not come out of the stove, soaking time 1min, and infrared radiation thermometer shows 1182 DEG C of blank external skin temperatures, 1187 DEG C of interior table temperature;

6. hot extrusion: hot extrusion uses the hot extrusion tool and mould of 194 × 22mm of Φ, and shape and schematic diagram are shown in that Fig. 1, section are received Shrinkage 81.06%, 30s completes solid solution after extruding;

Fig. 1 shows the outfit and use state of tool and mould, and extrusion die 4 is located at the outlet of extrusion cylinder 2, and blank 3 is in extrusion die 4 Under the action of section shrinkage, formed 8 semi-finished product of tubing.Extrusion die 4 is fixed on die holder 7 by die-cushion 6.

The outer diameter of steel pipe is 194.5mm, wall thickness 22.8mm after hot extrusion.After extruding successively through aligning, pickling, repair Mill.

(4) first time semi-finished product cold rolling

It is required according to trimmed size, the cold-rolling process of first time semi-finished product are as follows: 194 × 22mm of Φ → 168 × 15mm of Φ rolls Outer diameter 168.5mm after system, wall thickness 15.2mm, reducing rate 13.40%, wall cut rate 31.82%, feed 4mm/ times roll number 30 Secondary/min.

Steel pipe after cold rolling, is heat-treated through degreasing;

(5) first time semi-finished product are heat-treated

The control of semi-finished product heat treatment temperature at 1170 ± 10 DEG C, soaking time control in 45min, survey furnace temperature be 1175~ Between 1178 DEG C;

15s enters water solid solution after heat treatment;

Cold reaming is carried out after aligning, pickling, reconditioning, lubrication.

(6) cold reaming

Cold reaming is carried out using the internal model that specification is Φ 150mm, internal model material is YG8, and expanding rear outer diameter is 181.2mm, Wall thickness is 14.82mm.

Second of expanding, internal model specification is successively carried out after degreasing, heat treatment, aligning, sawing, pickling, reconditioning, lubrication For 170mm, material YG8, expanding rear outer diameter is 201mm, wall thickness 14.5mm.It is heat-treated soaking time 45min, surveys furnace temperature Between 1175~1178 DEG C, 15s enters water solid solution after heat treatment.

Expanding, the internal model specification of third time is successively carried out after degreasing, heat treatment, aligning, sawing, pickling, reconditioning, lubrication For 200mm, material YG8, expanding rear outer diameter is 328.8mm, wall thickness 14.2mm.It is heat-treated soaking time 45min, surveys furnace Between 1173~1177 DEG C of temperature, 15s enters water solid solution after heat treatment.

The 4th expanding, internal model specification is successively carried out after degreasing, heat treatment, aligning, sawing, pickling, reconditioning, lubrication For 225mm, material YG8, expanding rear outer diameter is 252.5mm, wall thickness 14.0mm.It is heat-treated soaking time 45min, surveys furnace Between 1174~1176 DEG C of temperature, 15s enters water solid solution after heat treatment.

(7) second of semi-finished product cold rolling

It is required according to trimmed size, the cold-rolling process of second of semi-finished product are as follows: 250 × 14mm of Φ → 219 × 8.5mm of Φ, Outer diameter 219.3mm after rolling, wall thickness 8.6mm, reducing rate 12.4%, wall cut rate 36.67%, feed 4mm/ times roll number 30 Secondary/min.

Steel pipe after cold rolling, is heat-treated through degreasing;

(8) second of semi-finished product heat treatment

The control of semi-finished product heat treatment temperature at 1170 ± 10 DEG C, soaking time control in 26min, survey furnace temperature be 1175~ Between 1178 DEG C;

15s enters water solid solution after heat treatment;

Cold reaming is carried out after aligning, pickling, reconditioning, lubrication.

(9) cold reaming

Internal model specification is 233mm, and material is YG8, and outer diameter is 250.1mm, wall thickness 8.22mm after cold-drawn.

It by degreasing, heat treatment, aligning, sawing, pickling is finished product after cold-drawn.Execute finished product heat treatment process, heat preservation Time 16min surveys 1111~1115 DEG C of furnace temperature, and 15s enters water solid solution after heat treatment.

(10) nondestructive inspection

By ASME E213 " the practical regulation of metal nominal pipe and pipe ultrasonic inspection " carry out ultrasonic examination, II grade It is qualified.

(11) service check

Fished pipe takes two progress service checks, as a result as follows:

Service check fully meets standard ASME SB444 and user requires.Yield strength 20-25% high compared with standard, tension Intensity 5-7% high compared with standard, elongation percentage 70-72% high compared with standard.

Claims (6)

1. a kind of manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe, including hot extrusion, tubing cold working, heat treatment work Skill, it is characterised in that: the following steps are included:
(1) pipe is forged
Pipe component requirements are 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, which finishes, is molded into round billet, forges to round billet;
(2) blank prepares
By blank billet-sawn to 500~1000mm, depth drill processes 40~Φ of Φ 100mm central through hole;
(3) hot extrusion
1. blank preheats: blank preheats in annular furnace, and annular furnace temperature setting is 900 ~ 1000 DEG C, and the time in furnace is 1min/ Mm is increase accordingly with the outer diameter increase time in furnace;
2. an induction heating: blank is put into intermediate frequency furnace induction 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, keeps the temperature power≤200kW;
3. glass powder lubricates: the inside and outside wall of blank is lubricated using the glass powder of molten state under high temperature;
4. reaming: carrying out reaming using rose bit;
5. secondary induction heating: blank is put into intermediate frequency furnace induction heating, and induction heating is divided into 3 sections, and heating target temperature is set It is set to 1180 ± 10 DEG C, heating process avoids directly reaching target temperature, and every section of heating power is 600~650kW, keeps the temperature power ≤200kW;
During the secondary induction heating, first segment heating target temperature sets 1120 ± 10 DEG C, and heating is finished to stop in furnace Stay 1min;Second segment heating target temperature is set as 1150 ± 10 DEG C, and heating is finished stops 1min in furnace;The heating of third section is set It is set to 1180 ± 10 DEG C, soaking time 1min;
6. hot extrusion: using hot-extrusion mold, the contraction percentage of area is not less than 50%, is not more than 90%, and completion is solid in 30s after extruding It is molten;
Cold working process successively is transferred to through aligning, sawing, pickling after hot extrusion;
(4) it is cold worked
Cold working mode includes: cold rolling or cold rolling+cold-drawn;
1. cold-rolling process parameter setting: reducing rate: 10~40%;Wall cut rate: 10~50%;Feed 4~6mm/ times;Roll number 20-60 times/min;
2. cold-drawn is expanding or two kinds of tube reducing: expanding is 10~40mm/ passage, 0.2~0.5mm of wall thickness reduction;Tube reducing be 5~ 10mm/ passage, 1~1.5mm of wall thickness reduction;
Tubing after cold working, is heat-treated after degreasing;
(5) it is heat-treated
Tubing after cold working is both needed to be heat-treated, and heat treatment is divided into semi-finished product and two kinds of heat treatment process of finished product;Heat treatment Solid solution is completed in 20s afterwards;
Enter finished product process through aligning, pickling, reconditioning after heat treatment or process is cold worked in lower passage.
2. the manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe according to claim 1, it is characterised in that: described The diameter of step (1) pipe is 219-400mm, 2 or more forging ratio.
3. the manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy 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.
4. the manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe according to claim 1, it is characterised in that: step (3) in hot extrusion process, the rose bit of use are as follows: 80~250mm of Φ;The hot-extrusion mold of use are as follows: 114 × 10~Φ of Φ 325 × 40mm, the contraction percentage of area are not less than 50%, are no more than 90%;The external diametrical extent of tubing is 114~325mm of Φ after hot extrusion, Tolerance is ± 2mm;Wall thickness range is 10~40mm, wall thickness tolerance ± 1mm.
5. the manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy 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, soaking time 3min/mm;Finished product heat treatment temperature Degree is 1100~1150 DEG C, soaking time 2min/mm.
6. the manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe according to claim 1, it is characterised in that: step (4) and cold working described in (5) and heat treatment process step, alternately repeatedly, that is, include the cold working of first time semi-finished product, The heat treatment of first time semi-finished product, second of semi-finished product cold working, second of semi-finished product heat treatment ... n-th finished product heat treatment; Wherein n is the positive integer greater than 1.
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