CN104451100B - A kind of seamless steel pipe heat treatment method - Google Patents

A kind of seamless steel pipe heat treatment method Download PDF

Info

Publication number
CN104451100B
CN104451100B CN201410715014.1A CN201410715014A CN104451100B CN 104451100 B CN104451100 B CN 104451100B CN 201410715014 A CN201410715014 A CN 201410715014A CN 104451100 B CN104451100 B CN 104451100B
Authority
CN
China
Prior art keywords
steel pipe
temperature
seamless steel
heat treatment
pushing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201410715014.1A
Other languages
Chinese (zh)
Other versions
CN104451100A (en
Inventor
郭元蓉
鄢勇
邹友富
罗能
刘波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pangang Group Chengdu Steel & Vanadium Co Ltd
Original Assignee
Pangang Group Chengdu Steel & Vanadium Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pangang Group Chengdu Steel & Vanadium Co Ltd filed Critical Pangang Group Chengdu Steel & Vanadium Co Ltd
Priority to CN201410715014.1A priority Critical patent/CN104451100B/en
Publication of CN104451100A publication Critical patent/CN104451100A/en
Application granted granted Critical
Publication of CN104451100B publication Critical patent/CN104451100B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Abstract

The invention discloses a kind of seamless steel pipe heat treatment method.The present invention carries out staged cooling by the temperature-controlling system of heating furnace to heavy caliber seamless steel pipe, to ensure that the temperature difference in the range of seamless steel pipe overall length reduces, reach general heat treatment requirements ± 10 DEG C;Thus controlling the temperature drop in heat treatment process, it is to avoid seamless steel pipe causes, because of stress that the temperature difference produces, the situation that seamless steel pipe bends, and ensure that stability and the uniformity of whole seamless steel pipe performance simultaneously.

Description

A kind of seamless steel pipe heat treatment method
Technical field
The present invention relates to a kind of seamless steel pipe processing technique, be specifically related to a kind of seamless steel pipe heat treatment method.
Background technology
Annealing heat treatment is steel pipe to be heated to uniform temperature be incubated a period of time, then makes it slowly cool down. The annealing heat treatment of steel pipe is to be heated to steel pipe undergo phase transition or the temperature of partial phase change, via slow after insulation The heat treatment method of slow cool down.The purpose of heat treatment is to reduce hardness, improving plasticity, improve processability Energy;Eliminate internal stress, stablize steel pipe sizes, placement deformation and cracking;Crystal grain thinning, improvement are organized, are carried The mechanical property of high seamless steel pipe.
At present seamless steel pipe is when carrying out annealing heat treatment, after normal insulation, as long as by closing The heating burner of heat-treatment furnace, no longer heat supply, Steel Pipe Heat is carried out completely or isothermal with the free temperature drop of heat-treatment furnace Annealing.In the process, temperature drop process is uncontrollable process.
Owing to the universal length of seamless steel pipe is longer, about 4~12m;Therefore, whole seamless steel pipe will exist sternly Weight temperature contrast, the consequence thus brought is as follows:
1, stress that seamless steel pipe produces because of the temperature difference and bent;
2, the mechanical property difference of homogeneous tube is bigger.
Due to the steel tube anneal time long enough of the general annealing process used, so while whole seamless steel pipe Differences of mechanical properties is relatively big, but all can meet user's requirement, therefore not by enough attention.Along with user is to product The raising required, there is the steel pipe of two ends difference and is difficult to meet the requirement of user in this kind.And the temperature difference produces The bending that causes of stress the mode of aligning can be used to carry out, but, pipe end cannot be aligned and part nothing Seam steel pipe does not has suitable straightener, causes product lumber recovery to decline and even can not become because completing aligning For finished product.
Summary of the invention
[solving the technical problem that]
Present invention aim to address the problem that above-mentioned prior art exists, propose a kind of seamless steel pipe heat treatment Method so that not bent because of the stress of temperature difference generation after seamless steel pipe heat treatment, strengthen the power of seamless steel pipe Learn uniformity, optimize the preparation of seamless steel pipe further.
[technical scheme]
In order to reach above-mentioned technique effect, the present invention takes techniques below scheme:
The present invention is by carrying out staged cooling to heavy caliber seamless steel pipe, to ensure seamless steel pipe overall length model Enclose interior temperature difference to reduce, reach general heat treatment requirements ± 10 DEG C;Thus control the temperature in heat treatment process Fall, it is to avoid seamless steel pipe causes, because of stress that the temperature difference produces, the situation that seamless steel pipe bends, and ensure that whole simultaneously The stability of individual seamless steel pipe performance and uniformity.
A kind of seamless steel pipe heat treatment method, it comprises the following steps:
First, heavy caliber seamless steel pipe is vertically put in heating furnace;
Then, adjust the temperature of heating furnace, elevate the temperature after more than 800 DEG C, be incubated 20~30min; Then, utilize the temperature-controlling system of heating furnace to make heavy caliber seamless steel pipe lower the temperature by 20~40 DEG C of stageds, often drop A low temperature need to be incubated 20~95min;When temperature is down to 550 DEG C, closes temperature-controlling system, make heavy caliber Seamless steel pipe is air cooling 25~35min in heating furnace;
Finally, heavy caliber seamless steel pipe is taken out, is positioned on steel pipe stand cooling.
A preferred embodiment of the invention, described heavy caliber seamless steel pipe is selected from Φ 780 × 35mm Or the seamless steel pipe of Φ 356 × 25mm specification.
According to another preferred embodiment of the present invention, the preparation process of described heavy caliber seamless steel pipe is such as Under:
A, cycle Tube Rolling Train tube rolling
First take electroslag ingot and carry out steel ingot bore hole, the most again drilling/rolling, then align after annealing, Obtain first product seamless steel pipe;
B, pushing expander
The pipe end of first product seamless steel pipe step A obtained carries out tack process, inner surface sandblasting descales Processing with surface defect, the first product seamless steel pipe after then processing carries out pushing expander for the first time;
Then, make annealing treatment to reduce steel strength to the first product seamless steel pipe after first time pushing expander, Carry out second time pushing expander again, obtain described heavy caliber seamless steel pipe.
According to another preferred embodiment of the present invention, being in step, described annealing way is Full annealing.
According to another preferred embodiment of the present invention, in step, described aligning refers to reconditioning electroslag Ingot defects, it includes utilizing excision and reconditioning mode to remove pipe end defect.
According to another preferred embodiment of the present invention, in stepb, described first time pushing expander Hustling temperature is 740~760 DEG C, push system speed is 40mm/min, pushing dynamics is 12MPa;Described The hustling temperature of secondary pushing expander is 750 DEG C, push system speed is 20mm/min, pushing dynamics is 15MPa.
According to another preferred embodiment of the present invention, described temperature is increased to more than 850 DEG C.
According to another preferred embodiment of the present invention, described heating furnace is selected from chamber-type heating furnace or well formula Heating furnace.
According to another preferred embodiment of the present invention, described staged cooling be first by temperature by 30 DEG C Gradient be cooled to 680 DEG C step by step;Often cooling 30 DEG C, is incubated 20~30min;Then it is down in temperature When 650 DEG C, it is incubated 85~95min;Then, continue, by often cooling 30~40 DEG C, to be incubated 20~30min; Until temperature is down to 550 DEG C, close temperature-controlling system, stop staged cooling.
Will be described in detail the present invention below.
A kind of seamless steel pipe heat treatment method, it comprises the following steps:
First, heavy caliber is vertically put in heating furnace;
Then, adjust heating furnace seamless steel pipe temperature, elevate the temperature after more than 800 DEG C, be incubated 20~ 30min;Then, the temperature-controlling system of heating furnace is utilized to make heavy caliber seamless steel pipe lower the temperature by 20~40 DEG C of stageds, Often reduce a temperature and need to be incubated 20~95min;When temperature is down to 550 DEG C, close temperature-controlling system, make big Caliber seamless steel pipe is air cooling 25~35min in heating furnace;
Finally, heavy caliber seamless steel pipe is taken out, is positioned on steel pipe stand cooling.
The heavy caliber seamless steel pipe generally used annealing way in heating furnace, at temperature-fall period rate of temperature fall Uncontrollable, owing to seamless steel pipe is longer, there is the bigger temperature difference in steel pipe two ends in temperature-fall period, therefore causes Steel pipe produces the situation of bending because of thermal (temperature difference) stress effect;Meanwhile, seamless steel pipe two ends are because the temperature difference differs greatly Mechanical property difference is bigger.Therefore, in order to discharge the existence of this species diversity, break through setting of conventional annealing technique Putting, the present invention devises Gradient annealing technique.This Gradient annealing technique is by heat treatment temperature-fall period The mode of stage insulation, decreases the impact of the temperature difference.
A preferred embodiment of the invention, described heavy caliber seamless steel pipe is selected from Φ 780 × 35mm Or the seamless steel pipe of Φ 356 × 25mm specification.
According to another preferred embodiment of the present invention, the preparation process of described heavy caliber seamless steel pipe is such as Under:
A, cycle Tube Rolling Train tube rolling
First take electroslag ingot and carry out steel ingot bore hole, the most again drilling/rolling, then align after annealing, Obtain first product seamless steel pipe;
Electroslag ingot refers to utilize electric current to pass through liquid slag scum thermal resistance, is melted by metal electrode, the gold of fusing Belong to and accumulate molten, enter metal bath through slag blanket during drippage, then with crystallization and freezing in water mold The superhigh intensity steel ingot become.This electroslag ingot purity is high, sulfur-bearing is low, non-metallic inclusion is few, steel ingot table Face even compact smooth, clean, metallographic structure and chemical composition are uniform.The as cast condition mechanical performance of electroslag ingot Can reach or exceed the index of same steel grade forging.
The resistance of deformation of ultra high strength alloy steel is relatively big, easily occurs the defects such as infolding, circle split during steel ingot bore hole. In order to ensure steel pipe internal-surface quality, simultaneously also reduce mill load, present invention employs after steel ingot bore hole again The technique of drilling/rolling, solve circle split, infolding problem.
Due to the steel grade characteristic of ultra high strength alloy steel, after drilling/rolling, its intensity is high, hardness is big, the most not Can directly align, otherwise steel pipe is the most easily rectified and is split;Steel pipe often has interior outside fold defect at pipe end simultaneously, and this type of lacks Crackle origin is easily become when being trapped in aligning.It is thus desirable to carry out steel pipe full annealing at aligning, after annealing, Also need to remove pipe end defect by modes such as excision, reconditionings.
The present invention can also redesign mounting flange and be welded with the push rod junction, top of high-strength bolt Technical measures, are successfully completed pipe deformation.
B, pushing expander
The pipe end of first product seamless steel pipe step A obtained carries out tack process, inner surface sandblasting descales Processing with surface defect, the first product seamless steel pipe after then processing carries out pushing expander for the first time;
Due to pushing process characteristic, steel pipe contacts before and after needing, pushes the power providing deformation.If pipe end Injustice easily causes irregular deformation after extruding, and this will have a strong impact on the service life of warp tool.Therefore, push away Need before expander processed pipe end is carried out tack process.
Pushing is expander technique, and after this deforms, steel tube surface defect can be amplified on the basis of original, As shallow surface check easily splits after pushing deforms, crack depth is caused to deepen;It is thus desirable to carry out before pushing Surface defect processes.Meanwhile, the deformation of pushing technique realizes mainly by pushing top, if internal surface of steel pipe There is heavier oxide skin in face, and after pushing, inwall road plan situation is serious, therefore also needs the oxygen on surface before pushing Change skin and process clean.
Then, make annealing treatment to reduce steel strength to the first product seamless steel pipe after first time pushing expander, Carry out second time pushing expander again, obtain described heavy caliber seamless steel pipe.
The present invention, according to equipment situation, is designed with twice pushing shaped.Pushing process for the first time is the most stable, Pushing power is higher, and hustling temperature regards concrete thickness of steel pipe and selects suitable temperature.The too high steel pipe of temperature is easily generated Thicker iron scale, will increase subsequent treatment operation, and energy consumption is bigger simultaneously;Temperature is too low, then the change of steel pipe Shape drag will drastically promote, and will cause cannot be carried out producing when exceeding capacity of equipment.For ensureing second time pushing Quality, between twice pushing add annealing to reduce steel strength.Pushing process for the second time starts Time the most stable, speed pushing relatively for the first time is slow, and pushing force rate pushing power for the first time is high;Its main purpose is In order to reduce push system speed.The repeatedly pushing of the present invention use intermediate annealing and control suitable deflection and The technological measures such as relatively low velocity, successfully solve that ultra high strength alloy steel resistance of deformation is big, difficult the asking of pushing Topic.
According to another preferred embodiment of the present invention, described temperature is increased to more than 850 DEG C.
The present invention need raise temperature be more than the phase transition temperature interval of seamless steel pipe or within a certain temperature Degree.Temperature will be increased to more than seamless steel pipe sub-eutectoid steel, eutectoid steel or hypereutectoid steel 30~50 DEG C;Protect Hold a period of time.Heating process is that seamless steel pipe is changed into austenite, and insulation a period of time is seamless in order to make Steel pipe is completely transformed into austenite.
According to another preferred embodiment of the present invention, described heating furnace is selected from chamber-type heating furnace or well formula Heating furnace.
According to another preferred embodiment of the present invention, described staged cooling be first by temperature by 30 DEG C Gradient be cooled to 680 DEG C step by step;Often cooling 30 DEG C, is incubated 20~30min;Then it is down in temperature When 650 DEG C, it is incubated 85~95min;Then, continue, by often cooling 30~40 DEG C, to be incubated 20~30min; Until temperature is down to 550 DEG C, close temperature-controlling system, stop staged cooling.
The present invention with reference to former Technology for Heating Processing, remains the highest holding temperature, moderate soak temperature and last Holding temperature, and adaptability adds appropriate holding temperature and constitutes relatively compact insulation gradient, to subtract Few temperature difference, it is to avoid the impact that the temperature difference produces.
The temperature retention time in the present invention each stage is that the weight calculating according to heavy caliber seamless steel pipe gets.Wherein Between temperature retention time be according to situation and the non-uniform time that the temperature difference occurs during actual temperature drop, obtain through repetitive measurement Go out.
[beneficial effect]
The present invention compared with prior art, has a following beneficial effect:
The present invention successfully solves the temperature that bent in seamless steel pipe heat treatment process, it is achieved that steel pipe is not aligned I.e. meet technical protocol requirement.And the seamless steel pipe performance indications of heat treatment of the present invention fully meet technology association View requirement, eliminates the difference causing seamless steel pipe two ends performance to exist because of common annealing technique, it is ensured that whole The stability of individual seamless steel pipe performance.Present invention, avoiding simultaneously part seamless steel pipe because of heat treatment produce curved Bent, mechanical heterogeneity and the phenomenon of correction cannot be aligned.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment of the present invention 1 heavy caliber seamless steel pipe vertical hanging;
Fig. 2 is conventional annealing process curve figure of the present invention, and wherein high temperature section that is 860 DEG C temperature retention time is no less than 90min, temperature retention time t1 is pressed 0.25h/ ton and is calculated;Temperature retention time t2 of 650 ± 10 DEG C is pressed 0.35h/ ton and is calculated; The speed of cooling is 50 DEG C/h;
Fig. 3 is the embodiment of the present invention 1 staged annealing process curve figure, wherein, t1=6h;T2~ T7=20min;T8=90min;T9~t10=20min;T11=30min;
Description of reference numerals is as follows:
1 is holder;3 is hook;
2 is link plate;4 is heavy caliber seamless steel pipe.
Detailed description of the invention
Below in conjunction with embodiments of the invention, the invention will be further elaborated.
Embodiment 1:
" rolling+pushing " production method of a kind of Φ 780 × 35mm specification D6AE steel pipe, according to equipment feelings Condition, is designed with twice pushing shaped, i.e. Φ 508 × 44mm → Φ 610 × 40mm → Φ 780 × 35mm.
A, cycle Tube Rolling Train tube rolling
First the D6AE electroslag ingot taking Φ 500mm carries out steel ingot bore hole (Φ 120mm), bores a hole the most again Rolling, aligns after then full annealing processes, obtains the first product seamless steel pipe of Φ 508 × 44mm specification;
B, pushing expander
The pipe end of first product seamless steel pipe step A obtained carries out tack process, inner surface sandblasting descales Processing with surface defect, the first product seamless steel pipe after then processing carries out pushing expander for the first time;For the first time Pushing process is the most stable, and the speed of pushing is relatively slow, for 40mm/min;Pushing power reaches 12MPa;Due to steel Tube wall is thicker, and hustling temperature is 740~760 DEG C.The time of pushing expander about 2.5 hours for the first time.
Then, make annealing treatment to reduce steel strength to the first product seamless steel pipe after first time pushing expander, Carry out second time pushing expander, obtain the heavy caliber seamless steel pipe 4 of Φ 780 × 35mm specification;Second time pushes away Process processed is the most stable when starting, and speed is relatively slow, and for 20mm/min, pushing power is up to 15MPa;Pushing temperature Degree is about 750 DEG C.Because push system speed is slow, about 8 hours time of pushing for the second time.
C, heat treatment
The heavy caliber seamless steel pipe 4 step B obtained carries out heat treatment in being suspended on well formula heat-treatment furnace, heat Processing mode is staged annealing process.
The hang of the heavy caliber seamless steel pipe 4 of Φ 780 × 35mm specification is as follows:
First, as it is shown in figure 1, by heavy caliber seamless steel pipe 4 one end weld clip gripping member 1, described holder 1 Having four, its interval is evenly distributed in one end of seamless steel pipe;A circular extension is welded on described holder 1 Plate 2, described link plate 2 arranges four hooks 3, and described four hooks 3 are just laying respectively at four holders 1 Top;
Then, utilize the hook 3 on link plate 2 to connect pulling equipment, heavy caliber seamless steel pipe 4 is vertically hanged Sky puts into pit furnace;
Owing to heavy caliber its D/S of superhigh intensity steel seamless steel tube of the present embodiment 1 preparation is 22.3, when it is long Between high annealing, steel pipe easily deforms, and current straightener is difficult to correct, accordingly, it would be desirable at aboveground heat In reason stove, steel pipe is hung and carries out Technology for Heating Processing, and use weld clip gripping member and link plate by unsettled for steel pipe Process in stove and will not become ellipse or locally concave surface occur.
The method is utilized to carry out heavy caliber seamless steel pipe heat treatment, its heavy caliber seamless steel pipe heat treatment priority External diameter and internal diameter are more or less the same in 1mm.
Then, adjust the temperature of pit furnace, elevate the temperature after 860 DEG C, be incubated 20min;Then, The temperature-controlling system utilizing pit furnace makes heavy caliber seamless steel pipe 4 lower the temperature with stove by 30 DEG C of stageds, often drops A low temperature need to be incubated 20min;When being reduced to 650 DEG C, it is incubated 90min;Then continue to by 30 DEG C of ladders Formula is to 590 DEG C, and often reducing a temperature needs 20min;Then it is reduced to 550 DEG C, is incubated 30min, close Close temperature-controlling system, make heavy caliber seamless steel pipe 4 air cooling 30min in pit furnace;Concrete staged is moved back Ignition technique curve chart is as it is shown on figure 3, specific as follows:
Within 6 hours, it is heated to 860 DEG C → 860 DEG C insulation 20min → 830 DEG C insulation 20min → 800 DEG C insulations Insulation 20min → 710 DEG C insulation 20min → 680 DEG C the insulation of insulation 20min → 740 DEG C, 20min → 770 DEG C Insulation 20min → 590 DEG C insulation 20min → 550 DEG C the insulation of insulation 1h30min → 620 DEG C, 20min → 650 DEG C 30min, puts stand cooling after the air cooling 30min that then plays.
Compared to conventional annealing technique, as in figure 2 it is shown, specifically 860 DEG C insulation 0.25 hours/ton, with often Hour≤temperature drop of 50 DEG C, it is down to 650 DEG C of insulation 0.35 hours/ton, the most again with the temperature of per hour≤50 DEG C Fall, goes out heat-treatment furnace, air cooling after being down to 550 DEG C.The present embodiment staged annealing process and conventional annealing technique Relatively, do not adjust at 860 DEG C and 650 DEG C of insulations carried out respectively.But newly design stepped cooling distribution, In heat treatment process by the way of the stage is incubated, decrease the impact of the temperature difference.
The present invention compares with former Technology for Heating Processing, does not adjusts at 860 DEG C and 650 DEG C of insulations carried out respectively. And the newly-designed the most stepped distribution of heat treatment cycle curve, the side being incubated by the stage in heat treatment process Formula, decreases the impact of the temperature difference.
Through measuring, use every meter of the seamless steel pipe flexibility≤3mm of conventional annealing PROCESS FOR TREATMENT;And use this reality Executing the seamless steel pipe that the staged annealing process of example processes, every meter of flexibility is 2.5mm to the maximum.Therefore this enforcement It is little that example achieves seamless steel pipe flexibility, does not align and i.e. meets technical protocol requirement, and performance indications are the fullest Foot technical protocol requirement.
Then sample, check, obtain described heavy caliber superhigh intensity steel seamless steel tube.
By seamless steel pipe is carried out hardness measurement.Can draw, use the seamless of conventional annealing PROCESS FOR TREATMENT Steel pipe head end Brinell hardness diameter HBD is 4.1mm, and tail end is 4.3mm;And use the staged of the present embodiment The seamless steel pipe two ends HBD end to end that annealing process processes is 4.25mm.As can be seen here, entered staged to move back The performance of the seamless steel pipe that ignition technique processes is uniform and stable.
The Gradient annealing technique of the present invention, can effectively control temperature drop rate, it is ensured that steel pipe is homogeneous tube when annealing Without the obvious temperature difference.Thus avoid the situation of the stress appearance bending that steel pipe produces because of the temperature difference, ensure that whole simultaneously The stability of pipe performance.
Φ 780 × 35mm specification D6AE superhigh intensity steel seamless steel tube that the present embodiment obtains decreases bending Degree, does not align and i.e. meets technical protocol requirement, and performance indications fully meet technical protocol requirement.
Although reference be made herein to invention has been described for the explanatory embodiment of the present invention, and above-described embodiment is only For the present invention preferably embodiment, embodiments of the present invention are also not restricted to the described embodiments, it should Understanding, those skilled in the art can be designed that a lot of other amendments and embodiment, and these are revised and real The mode of executing will fall within spirit disclosed in the present application and spirit.

Claims (6)

1. a seamless steel pipe heat treatment method, it is characterised in that it comprises the following steps:
First, the heavy caliber seamless steel pipe (4) of Φ 780 × 35mm or Φ 356 × 25mm specification is vertically put Enter in heating furnace;
Then, adjust the temperature of heating furnace, elevate the temperature after more than 800 DEG C, be incubated 20~30min; Then, the temperature-controlling system of heating furnace is utilized to make heavy caliber seamless steel pipe (4) lower the temperature by 20~40 DEG C of stageds, Often reduce a temperature and need to be incubated 20~95min;When temperature is down to 550 DEG C, closes temperature-controlling system, make Heavy caliber seamless steel pipe is air cooling 25~35min in heating furnace;
Finally, heavy caliber seamless steel pipe is taken out, is positioned on steel pipe stand cooling;
The preparation process of described heavy caliber seamless steel pipe (4) is as follows:
A, cycle Tube Rolling Train tube rolling
First take electroslag ingot and carry out steel ingot bore hole, the most again drilling/rolling, then align after annealing, Obtain first product seamless steel pipe;
B, pushing expander
The pipe end of first product seamless steel pipe step A obtained carries out tack process, inner surface sandblasting deoxygenation Skin and surface defect process, and the first product seamless steel pipe after then processing carries out pushing expander for the first time;
Then, the first product seamless steel pipe after first time pushing expander is made annealing treatment to reduce steel pipe strong Degree, then carry out second time pushing expander, obtain described heavy caliber seamless steel pipe (4);
In stepb, the hustling temperature of described first time pushing expander is 740~760 DEG C, push system speed It is 12MPa for 40mm/min, pushing dynamics;The hustling temperature of described second time pushing expander is 750 DEG C, Push system speed is 20mm/min, pushing dynamics is 15MPa.
Seamless steel pipe heat treatment method the most according to claim 1, it is characterised in that in step, institute The annealing way stated is full annealing.
Seamless steel pipe heat treatment method the most according to claim 1, it is characterised in that in step, institute Stating aligning and refer to reconditioning electroslag ingot defect, it includes utilizing excision and reconditioning mode to remove pipe end defect.
Seamless steel pipe heat treatment method the most according to claim 1, it is characterised in that described temperature raises To more than 850 DEG C.
Seamless steel pipe heat treatment method the most according to claim 1, it is characterised in that described heating furnace choosing From chamber-type heating furnace or pit furnace.
Seamless steel pipe heat treatment method the most according to claim 1, it is characterised in that described staged is lowered the temperature It is first temperature to be cooled to 680 DEG C step by step by the gradient of 30 DEG C;Often cooling 30 DEG C, insulation 20~ 30min;Then, when temperature is down to 650 DEG C, it is incubated 85~95min;Then, continue by often lowering the temperature 30~40 DEG C, it is incubated 20~30min;Until temperature is down to 550 DEG C, close temperature-controlling system, stop rank Ladder type is lowered the temperature.
CN201410715014.1A 2014-11-29 2014-11-29 A kind of seamless steel pipe heat treatment method Active CN104451100B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410715014.1A CN104451100B (en) 2014-11-29 2014-11-29 A kind of seamless steel pipe heat treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410715014.1A CN104451100B (en) 2014-11-29 2014-11-29 A kind of seamless steel pipe heat treatment method

Publications (2)

Publication Number Publication Date
CN104451100A CN104451100A (en) 2015-03-25
CN104451100B true CN104451100B (en) 2016-08-17

Family

ID=52897842

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410715014.1A Active CN104451100B (en) 2014-11-29 2014-11-29 A kind of seamless steel pipe heat treatment method

Country Status (1)

Country Link
CN (1) CN104451100B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107008768A (en) * 2017-04-18 2017-08-04 浙江益大特钢有限公司 The manufacture method of stainless-steel seamless pipe
CN110756616B (en) * 2019-10-30 2021-04-30 江苏隆达超合金股份有限公司 Preparation method for reducing high-carbon martensitic stainless steel pipe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101259582A (en) * 2008-04-28 2008-09-10 江阴市界达特异制管有限公司 Preparation of seamless special-shaped steel pipe for low temperature resistance oil derrick electric transmission pole tower
CN101899556A (en) * 2010-08-11 2010-12-01 内蒙古北方重工业集团有限公司 Heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature
CN102069104A (en) * 2010-11-30 2011-05-25 攀钢集团钢铁钒钛股份有限公司 Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode
CN102382962A (en) * 2011-11-10 2012-03-21 浙江健力股份有限公司 Quick spheroidizing annealing technology for GCr15 bearing steel pipe
CN103521548A (en) * 2013-10-25 2014-01-22 安吉县鹏大钢管有限公司 Method for manufacturing martensitic steel tube
CN103543154A (en) * 2013-11-04 2014-01-29 攀钢集团成都钢钒有限公司 Method for judging defect formation process of cold-drawn steel pipe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101259582A (en) * 2008-04-28 2008-09-10 江阴市界达特异制管有限公司 Preparation of seamless special-shaped steel pipe for low temperature resistance oil derrick electric transmission pole tower
CN101899556A (en) * 2010-08-11 2010-12-01 内蒙古北方重工业集团有限公司 Heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature
CN102069104A (en) * 2010-11-30 2011-05-25 攀钢集团钢铁钒钛股份有限公司 Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode
CN102382962A (en) * 2011-11-10 2012-03-21 浙江健力股份有限公司 Quick spheroidizing annealing technology for GCr15 bearing steel pipe
CN103521548A (en) * 2013-10-25 2014-01-22 安吉县鹏大钢管有限公司 Method for manufacturing martensitic steel tube
CN103543154A (en) * 2013-11-04 2014-01-29 攀钢集团成都钢钒有限公司 Method for judging defect formation process of cold-drawn steel pipe

Also Published As

Publication number Publication date
CN104451100A (en) 2015-03-25

Similar Documents

Publication Publication Date Title
CN103934269B (en) A kind of TC4 titanium alloy seamless tube and production method thereof
CN102899460B (en) Heat treatment method for martensitic stainless steel forging module
CN102513479B (en) Production process for large-diameter fine isometric crystal tissue titanium alloy bar
CN103465027B (en) The thin brilliant dish base manufacture method of a kind of GH4169 alloy
CN101328522B (en) Smelting production method of low activation martensitic steel for fusion reactor
JP6369547B2 (en) Low alloy oil well steel pipe
CN102350476B (en) Method for manufacturing large cake forgings of high-carbon and high-chromium cold working die steel
CN104141039B (en) A kind of rolling mill practice controlling 42CrMo steel bloom gren rod decarburization
CN102179681B (en) Pipe mold manufacturing process adopting continuous-casting blank to forge and roll rough blank periodically
CN104827245B (en) A kind of forging technology of bearing ring
CN101941039B (en) High-strength aluminum alloy isothermal direction-change open die forging method and device
CN105525078B (en) A kind of preparation method of raising 4Cr5MoSiV1 hot-work die Steel Properties
CN100431781C (en) Method for making hammer stem for forging equipment
CN105543749B (en) High-entropy alloy gradient stress modification technology
CN103290192B (en) Thermal treatment process of spliced-welding type large tube plate forging of pressure container
CN103028912B (en) Steel forging manufacturing method for valve seat of deep-sea oil production equipment
CN100519813C (en) High-strength toughness cold working die steel and method of producing the same
CN103014534B (en) Cast hot work die steel and processing method thereof
CN104745968A (en) HRB500E seismic steel bar and preparation method thereof
CN203610629U (en) Gas-protected crystallizer for horizontal continuous casting of copper tubes
CN105714202B (en) A kind of method for casting production of coal-cutting machinery high-strength cast steel part
CN103014511B (en) High-toughness cold-work mould steel and complete processing thereof
CN103981445A (en) Process for producing H13 hot work die steel
CN105562965A (en) Method for preparing nickel-based alloy welding wire
CN103334061A (en) Die-casting die steel with high heat conductivity and large section and preparation and heat treatment method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant