CN109457178A - Steel alloy, seamless steel pipe and preparation method thereof, drilling water-separation pipe - Google Patents
Steel alloy, seamless steel pipe and preparation method thereof, drilling water-separation pipe Download PDFInfo
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- CN109457178A CN109457178A CN201811307828.6A CN201811307828A CN109457178A CN 109457178 A CN109457178 A CN 109457178A CN 201811307828 A CN201811307828 A CN 201811307828A CN 109457178 A CN109457178 A CN 109457178A
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- steel pipe
- pipe
- seamless steel
- blank
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/12—Underwater drilling
Abstract
The present invention provides a kind of steel alloys, seamless steel pipe and preparation method thereof, drilling water-separation pipe, wherein calculates in percentage by weight, steel alloy includes: Fe, C, Si, Mn, Cr, Mo, Ni, Nb, P, S and Al；Wherein, the content of each component are as follows: 0.06%≤C≤0.12%, 0.20%≤Si≤0.50%, 1.30%≤Mn≤1.60%, 0.10%≤Cr≤0.50%, 0.10%≤Mo≤0.50,0.15%≤Ni≤0.30%, 0.01%≤Nb≤0.05%, 0.010%≤Al≤0.040%, P≤0.015%, S≤0.003%.Technical solution of the present invention efficiently solves the problems, such as that alloy steel material in the prior art is unable to satisfy the production requirement of drilling water-separation pipe.
Description
Technical field
The present invention relates to pipelines to produce and process technical field, in particular to a kind of steel alloy, seamless steel pipe and its system
Make method, drilling water-separation pipe.
Background technique
With the continuous exploitation of land oil and natural gas resource, oil exploration and exploitation is just opened up towards ocean direction
Exhibition, and the exploration and development of marine oil and gas must just use and arrive drilling water-separation pipe.
Offshore Drilling Riser is the important tool of offshore oil exploration and exploitation, be connection ocean platform or drill ship with
The pith of subsea wellheads mainly plays insulating sea water and supports various control pipelines, is to influence entire marine drilling
The key link of security of system.The service condition of Offshore Drilling Riser is severe, needs to bear very high external sea hydraulic pressure
Power, ocean bottom currents, whirlpool impulse the stress and load complicated and changeable such as dynamic, period torsion, rotoflector, therefore marine drilling water proof
The technical requirement of pipe is very harsh, not only requires higher tensile property, excellent low-temperature flexibility, anti-collapse property
And anti-fatigue performance, and very high requirement is proposed to the geometric accuracy of steel pipe, be it is a kind of have high-tech difficulty,
The petroleum drilling and mining of high risk is equipped.Traditional alloy steel material is unable to satisfy the production requirement of drilling water-separation pipe.
Summary of the invention
The main purpose of the present invention is to provide a kind of steel alloy, seamless steel pipe and preparation method thereof, drilling water-separation pipe, with
Solve the problems, such as that alloy steel material in the prior art is unable to satisfy the production requirement of drilling water-separation pipe.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of steel alloy, according to weight percent
It calculates, steel alloy includes: Fe, C, Si, Mn, Cr, Mo, Ni, Nb, P, S and Al；Wherein, the content of each component are as follows: 0.06%≤C
≤ 0.12%, 0.20%≤Si≤0.50%, 1.30%≤Mn≤1.60%, 0.10%≤Cr≤0.50%, 0.10%≤Mo
≤ 0.50,0.15%≤Ni≤0.30%, 0.01%≤Nb≤0.05%, 0.010%≤Al≤0.040%, P≤0.015%,
S≤0.003%.
Further, the content of the Cr in steel alloy are as follows: 0.20%≤Cr≤0.40%.
Further, the content of the Mo in steel alloy are as follows: 0.20%≤Mo≤0.40%.
According to another aspect of the present invention, a kind of seamless steel pipe is provided, seamless steel pipe is made of steel alloy, steel alloy
For above-mentioned steel alloy.
According to another aspect of the present invention, a kind of its production method of seamless steel pipe is provided, seamless steel pipe is above-mentioned
The step of seamless steel pipe, production method includes: to smelt steel alloy to obtain blank；Blank is successively heated,
Perforation, rolling pre- pipe；Thermal expansion is carried out to pre- pipe and obtains hollow forging；Cold-drawn is carried out to hollow forging and obtains prefabricated steel pipe；To pre-
Steel pipe processed is heat-treated to obtain seamless steel pipe.
Further, steel alloy into smelting step include: electric furnace smelting to be carried out to the raw material of steel alloy, and obtain just
Base；External refining is carried out to first base, to obtain smart base；Vacuum outgas is carried out to smart base and carries out arc continuous casting, to obtain blank.
Further, smart base carries out arc continuous casting using circular-arc type continuous casting machine；Circular-arc type continuous casting machine includes crystallizer, and crystallizer exists
During arc continuous casting, the drawing speed of crystallizer control is between 0.4m/min~0.6m/min, the vibration frequency of crystallizer
For rate between 160opm~220opm, the amplitude of crystallizer controls the offset adjusting range of crystallizer between 2mm~5mm
Between 12%~28%.
Further, the making step of pre- pipe includes: by blank heating to 1240 DEG C~1260 DEG C, and keep the temperature 3h~
3.5h, to obtain hot blank；Hot blank is subjected to cone-type piercer at 1130 DEG C~1200 DEG C, to obtain hollow billet；By hollow billet into
Row tube rolling, to obtain pre- pipe.
Further, the heating process of blank successively includes that preheating section heats, I sections of heating of heating, II sections of heating of heating, adds
Hot III sections of heating, I sections of soaking and II sections of soaking；Wherein, blank heating is greater than or equal to 10h at the heating time of hot blank,
The temperature of blank is heated to 970 DEG C~990 DEG C by preheating section heating, is heated I sections of heating for the temperature of blank and is heated to 1090 DEG C
, II sections of heating are heated by the temperature of blank and are heated to 1170 DEG C~1190 DEG C, heat III sections of heating for the temperature of blank by~1110 DEG C
Degree is heated to 1220 DEG C~1260 DEG C, and the temperature that I section and soaking II sections of soaking is maintained at 1240~1260 DEG C, I sections of soaking with
After II sections of heat preservation 3h~3.5h of soaking, hot blank is obtained.
Further, for blank into the process of pre- pipe, hollow billet carries out tube rolling using Pilger rolling unit, is rolling
During pipe, control the feed quantity of hollow billet between 50mm~80mm, and control the roll rotational speed of Tube Rolling Train 25rpm~
Between 60rpm, while the wind pressure of roll is controlled between 5.5bar~7bar.
Further, the process of pre- pipe to hollow forging includes: that the part of pre- pipe is used mid-frequency induction heating extremely
810 DEG C~850 DEG C, to obtain heat pipe base；Heat pipe base is subjected to thermal expansion with the forward speed of 60mm~80mm per minute, to obtain
Hollow forging.
Further, the process of hollow forging to prefabricated steel pipe includes: that hollow forging is put into the descaling bath for filling hydrochloric acid solution
The mass concentration of interior carry out pickling, hydrochloric acid solution controls between 10%~20%, and pickling time is controlled in 60min~100min
Between, the hollow forging after obtaining pickling；Hollow forging after pickling is subjected to outer surface phosphorating treatment using zinc phosphate solution, to generate phosphorus
The mass concentration of the chemical overlay film of sour zinc, zinc phosphate solution controls between 30%~35%, and the temperature of zinc phosphate solution controls
Between 60 DEG C~70 DEG C, the hollow forging phosphating time after pickling is controlled between 30min~50min, to obtain the famine after phosphatization
Pipe；Hollow forging after phosphatization is subjected to saponification process by saponification liquor, so that its surface is formed metallic soap lubricating film coated, in saponification process
Temperature control between 60 DEG C~80 DEG C, time of saponification controls between 20min~35min, and the control of saponification liquor pH value exists
Hollow forging between 8.5~9.5, after being saponified；Hollow forging after saponification is subjected to cold-drawn process by drawbench, drawbench is maximum
600 tons of pulling capacity, the cold-drawn speed of drawbench obtains prefabricated steel pipe between 0.85m/min~1.0m/min.
Further, the process for being heat-treated to obtain seamless steel pipe to prefabricated steel pipe includes: to quench prefabricated steel pipe
Fire, the temperature of quenching are 920 DEG C~940 DEG C, and keep the temperature cooling after 100min~120min；Prefabricated steel pipe after cooling is carried out
Tempering, the temperature of tempering are 660 DEG C~680 DEG C, and keep the temperature it is air-cooled after 120min~150min, to obtain seamless steel pipe.
According to another aspect of the present invention, a kind of drilling water-separation pipe, including seamless steel pipe are provided, seamless steel pipe is above-mentioned
The prepared seamless steel pipe of production method.
It applies the technical scheme of the present invention, in the steel alloy, controls the content of C between 0.06%~0.12%, can mention
The intensity of high steel pipe improves the welding performance of steel pipe.C content is excessively high, unfavorable to the toughness of steel, increases the cold brittleness and timeliness of steel
Sensibility；C content is too low, can reduce the mechanical property of steel；The content of Si element controls between 0.20%~0.50%, can
It realizes that the effect of oxygen in removing raw material is able to suppress delta ferrite crystallization again, and then improves the toughness of seamless steel pipe, Si too high levels
The development that can promote temper brittleness, reduces plasticity；Mn content controls between 1.30%~1.60%, can improve raw material
Harden ability and hot-working character, stable austenite tissue, and the corrosion resistance of seamless steel pipe will not be made because of Mn too high levels
The austenite for expanding γ phase region can be declined；The control of Cr content cooperates with Mn element, can improve 0.10%~0.50%
The harden ability of raw material, in tempering, the carbide of Cr has under short time heating compared with indissoluble solution and hinders the crystal grain effect of growing up, improve
Steel belt roof bolt stability；Mo content controls between 0.10%~0.50%, passes through the performance of its phase transformation strengthening and solution strengthening
The intensity and toughness for promoting seamless steel pipe, while can reduce temper brittleness, but Mo too high levels will lead to ferrite δ phase or its
The appearance of its brittlement phase and reduce toughness；Ni as its higher cost of precious metal element, the control of Ni content 0.15%~
Between 0.30%, the harden ability of raw material can be significantly increased on the basis of reasonable control cost, and then improve seamless steel pipe
Intensity；Nb content controls between 0.01%~0.05%, is able to suppress coarse grains in Steel Tube Heat Treatment Process, and
It is able to suppress coarse carbonitride to be precipitated, and then optimizes the toughness of steel pipe；Meanwhile Al content control 0.01%~
Between 0.04%.Al is the good deoxidier of steel, produces fine crushing, submicroscopic the oxide of height, is scattered in steel body product
Crystal grain when steel heating is prevented to grow up, and make its content that can be effectively prevented from field trash below 0.04% to make with bulk
The toughness for obtaining seamless steel pipe reduces and surface defect occurs.S and P is harmful element, and content wants strict control, P content control
Make 0.015% hereinafter, the control of S content 0.003% hereinafter, less P and S can reduce the field trash in steel, improve steel
Degree of purity further increases the toughness of steel.Not only yield strength and tension with higher are strong for the seamless steel pipe that the raw material is formed
Degree also has preferable low-temperature flexibility and dimensional accuracy.Technical solution of the present invention efficiently solves conjunction in the prior art
Golden Steel material is unable to satisfy the problem of production requirement of drilling water-separation pipe.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the flow chart of the production method of seamless steel pipe according to the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Embodiment one
One of embodiment one steel alloy, is calculated in percentage by weight, steel alloy include: Fe, C, Si, Mn, Cr,
Mo, Ni, Nb, P, S and Al.Wherein, the content of each component are as follows: 0.06%≤C≤0.12%, 0.20%≤Si≤0.50%,
1.30%≤Mn≤1.60%, 0.10%≤Cr≤0.50%, 0.10%≤Mo≤0.50,0.15%≤Ni≤0.30%,
0.01%≤Nb≤0.05%, 0.010%≤Al≤0.040%, P≤0.015%, S≤0.003%.
The technical solution of Application Example one in the steel alloy, controls the content of C between 0.06%~0.12%, energy
The intensity for improving steel pipe, improves the welding performance of steel pipe.C content is excessively high, unfavorable to the toughness of steel, increase steel cold brittleness and when
Imitate sensibility；C content is too low, can reduce the mechanical property of steel；The content of Si element controls between 0.20%~0.50%, both
The effect for being able to achieve oxygen in removing raw material is able to suppress delta ferrite crystallization again, and then improves the toughness of seamless steel pipe, Si content mistake
Height can promote the development of temper brittleness, reduce plasticity；Mn content controls between 1.30%~1.60%, can improve raw material
Harden ability and hot-working character, stable austenite tissue, and the corrosion-resistant of seamless steel pipe will not be made because of Mn too high levels
Performance decline expands the austenite of γ phase region；The control of Cr content cooperates 0.10%~0.50% with Mn element, Ji Nengti
The harden ability of high raw material, in tempering, the carbide of Cr has under short time heating compared with indissoluble solution and hinders the crystal grain effect of growing up, mention
High steel belt roof bolt stability；Mo content controls between 0.10%~0.50%, passes through the property of its phase transformation strengthening and solution strengthening
The intensity and toughness of seamless steel pipe can be promoted, while temper brittleness can be reduced, but Mo too high levels will lead to ferrite δ phase or
The appearance of other brittlement phases and reduce toughness；Ni as its higher cost of precious metal element, the control of Ni content 0.15%~
Between 0.30%, the harden ability of raw material can be significantly increased on the basis of reasonable control cost, and then improve seamless steel pipe
Intensity；Nb content controls between 0.01%~0.05%, is able to suppress coarse grains in Steel Tube Heat Treatment Process, and
It is able to suppress coarse carbonitride to be precipitated, and then optimizes the toughness of steel pipe；Meanwhile Al content control 0.01%~
Between 0.04%.Al is the good deoxidier of steel, produces fine crushing, submicroscopic the oxide of height, is scattered in steel body product
Crystal grain when steel heating is prevented to grow up, and make its content that can be effectively prevented from field trash below 0.04% to make with bulk
The toughness for obtaining seamless steel pipe reduces and surface defect occurs.S and P is harmful element, and content wants strict control, P content control
Make 0.015% hereinafter, the control of S content 0.003% hereinafter, less P and S can reduce the field trash in steel, improve steel
Degree of purity further increases the toughness of steel.Not only yield strength and tension with higher are strong for the seamless steel pipe that the raw material is formed
Degree also has preferable low-temperature flexibility and dimensional accuracy.The technical solution of embodiment one efficiently solves in the prior art
Alloy steel material is unable to satisfy the problem of production requirement of drilling water-separation pipe.
In the technical solution of embodiment one, the content of the Cr in steel alloy are as follows: 0.20%≤Cr≤0.40%.Cr content
Control can further cooperate with Mn element, and then further increase the harden ability of raw material 0.20%~0.40%；And
And in tempering Cr carbide compared with indissoluble solution, have under short time heating and hinder the crystal grain effect of growing up, can be further improved
Steel belt roof bolt stability.
In the technical solution of embodiment one, the content of the Mo in steel alloy are as follows: 0.20%≤Mo≤0.40%.Mo content
Control further promotes seamless steel pipe by the performance of its phase transformation strengthening and solution strengthening between 0.20%≤Mo≤0.40%
Intensity and low-temperature flexibility, while temper brittleness can be further decreased.Iron caused by Mo too high levels can be prevented simultaneously
The appearance of ferritic δ phase or other brittlement phases and the case where reduce toughness.
One of embodiment one seamless steel pipe, seamless steel pipe are made of steel alloy, and steel alloy is above-mentioned steel alloy.
The seamless steel pipe that above-mentioned steel alloy is formed not only yield strength and tensile strength with higher, also have preferable low-temperature flexibility
And dimensional accuracy, to guarantee seamless steel pipe normal use in the presence of a harsh environment.
Embodiment one additionally provides a kind of its production method of seamless steel pipe, and seamless steel pipe is above-mentioned seamless steel pipe,
The step of production method includes:
Steel alloy is smelted to obtain blank.
Blank is successively heated, is perforated, rolling pre- pipe.
Thermal expansion is carried out to pre- pipe and obtains hollow forging.
Cold-drawn is carried out to hollow forging and obtains prefabricated steel pipe.
Prefabricated steel pipe is heat-treated to obtain seamless steel pipe.
Using the above-mentioned prepared heavy caliber seamless steel pipe of production method, not only yield strength with higher and anti-
Tensile strength also has preferable low-temperature flexibility and dimensional accuracy.Above-mentioned prefabricated steel pipe is high dimensional accuracy steel pipe, specifically,
Outside diameter tolerance is lower, experiments have shown that deviation can reach ± 1.0mm, wall thickness deviation is lower, experiments have shown that deviation can reach ±
2.0mm, yield strength can reach 555MPa or more, and tensile strength can reach 625MPa or more, the lateral full ruler of -20 DEG C of Charpy V-types
Very little ballistic work can reach 150J or more, and shearing ratio reaches 85% or more, and the use that properties are able to satisfy drilling water-separation pipe is wanted
It asks, especially can achieve the requirement of Offshore Drilling Riser, realize high-intensitive material, high tenacity and high dimensional accuracy
Good fitting.
It is worth noting that, in order to further save the manufacturing cost of seamless steel pipe and obtain that there is predetermined chemical ingredient
Raw material, the ingredient of preferably above-mentioned raw materials include a variety of in molten iron, steel scrap, ferroalloy and aluminium.Wherein ferroalloy and aluminium wire can
To be added in smelting process, the chemical component in raw material can not only be supplemented, aluminium wire is added in steel the life that will react with oxygen
At Al2O3, the Al that generates in tapping, calmness and casting2O3Most of float excludes, and realizes deoxidation purpose.
It is worth noting that, what the hollow forging in the present embodiment referred to is exactly pipe, formed by pre- pipe thermal expansion.
As shown in Figure 1, in the technical solution of embodiment one, steel alloy into smelting step include:
Electric furnace smelting is carried out to the raw material of steel alloy, and obtains just base.
External refining is carried out to first base, to obtain smart base.
Vacuum outgas is carried out to smart base and carries out arc continuous casting, to obtain blank.
Embryo material obtained by the above method has preferable harden ability.
As shown in Figure 1, smart base carries out arc continuous casting using circular-arc type continuous casting machine in the technical solution of embodiment one.Arc
Conticaster includes crystallizer, crystallizer during arc continuous casting, the drawing speed of crystallizer control 0.4m/min~
Between 0.6m/min, the vibration frequency of crystallizer between 160opm~220opm, the amplitude of crystallizer between 2mm~5mm,
The offset adjusting range of crystallizer is controlled between 12%~28%.During arc continuous casting, crystallizer is with above-mentioned frequency
Rate vibrates slag inclusion and bubble floating so that in molten steel, reduces blank surface slag inclusion, stomata, crackle, and use vibration device
The green shell of blank and crystallizer inner wall are separated, not only can guarantee that green shell was persistently separated with tube wall under vibrating conditions, but also control
Vibration frequency and amplitude ensure that the stable type of separation, avoid the green shell in vibration processes and generate bonding, in turn result in round tube
The generation of base face crack.
As shown in Figure 1, in the technical solution of embodiment one, the making step of pre- pipe includes:
By blank heating to 1240 DEG C~1260 DEG C, and 3h~3.5h is kept the temperature, to obtain hot blank.
Hot blank is subjected to cone-type piercer at 1130 DEG C~1200 DEG C, to obtain hollow billet.
Hollow billet is subjected to tube rolling, to obtain pre- pipe.
Its interior tissue is more uniform after the blank heating of the above method, and carries out heat at 1130 DEG C~1200 DEG C and wear
Hole cooperation obtains the uniform hollow billet of uniform diameter, mechanical property to the control of piercing process parameter, and then ensure that with the hollow billet
The quality of obtained hollow forging.
As shown in Figure 1, the heating process of blank successively includes preheating section heating, adds in the technical solution of embodiment one
Hot I sections of heating, II sections of heating of heating, III sections of heating of heating, I sections of soaking and II sections of soaking.Wherein, blank heating is at hot base
The heating time of material is greater than or equal to 10h, and the temperature of blank is heated to 970 DEG C~990 DEG C by preheating section heating, and I sections of heating add
The temperature of blank is heated to 1090 DEG C~1110 DEG C by heat, is heated II sections of heating for the temperature of blank and is heated to 1170 DEG C~1190
DEG C, III sections of heating are heated by the temperature of blank and are heated to 1220 DEG C~1260 DEG C, and the temperature that I sections and soaking II sections of soaking is kept
At 1240~1260 DEG C, after I sections and soaking II sections heat preservation 3h~3.5h of soaking, hot blank is obtained.
The above method can make blank be stepped up to soaking temperature, to further avoid, heating rate is too fast to be caused
The defect cracked in hot base.
As shown in Figure 1, in the process of blank to pre- pipe, hollow billet is using week in the technical solution of embodiment one
Phase formula Tube Rolling Train carries out tube rolling and controls the feed quantity of hollow billet between 50mm~80mm, and control tube rolling during tube rolling
The roll rotational speed of unit controls the wind pressure of roll between 5.5bar~7bar between 25rpm~60rpm.Periodic
The preferred Pilger Pilger rolling unit of Tube Rolling Train.Pilger Pilger rolling unit has forging property, is in hollow billet
The as-rolled condition of three-dimensional compressive stress is furthermore achieved micro- inside improvement seamless steel pipe to promote the metal densification of hollow billet
See the purpose of tissue.
As shown in Figure 1, in the technical solution of embodiment one, the process of pre- pipe to hollow forging includes:
By the part of pre- pipe using mid-frequency induction heating to 810 DEG C~850 DEG C, to obtain heat pipe base.
Heat pipe base is subjected to thermal expansion with the forward speed of 60mm~80mm per minute, to obtain hollow forging.
The higher hollow forging of the above-mentioned available precision of processing method.
As shown in Figure 1, in the technical solution of embodiment one, the process of hollow forging to prefabricated steel pipe includes:
Hollow forging is put into the descaling bath for fill hydrochloric acid solution and carries out pickling, the mass concentration of hydrochloric acid solution is controlled 10%
Between~20%, pickling time controls the hollow forging between 60min~100min, after obtaining pickling.
Hollow forging after pickling is subjected to outer surface phosphorating treatment using zinc phosphate solution, is covered with generating the chemistry of trbasic zinc phosphate
The mass concentration of film, zinc phosphate solution controls between 30%~35%, and the temperature of zinc phosphate solution is controlled at 60 DEG C~70 DEG C
Between, the hollow forging phosphating time after pickling controls between 30min~50min, to obtain the hollow forging after phosphatization.
Hollow forging after phosphatization is subjected to saponification process by saponification liquor, its surface is made to form metallic soap lubricating film coated, saponification
Temperature in the process controls between 60 DEG C~80 DEG C, and the time of saponification controls the saponification liquor pH value between 20min~35min
Control the hollow forging between 8.5~9.5, after being saponified.
By the hollow forging after saponification by drawbench carry out cold-drawn process, 600 tons of drawbench draft, drawbench it is cold
Speed is pulled out between 0.85m/min~1.0m/min, obtains prefabricated steel pipe.
The available stability of the above method is more preferable, the higher prefabricated steel pipe of precision.The above method can be prefabricated simultaneously
The surfaces externally and internally increase at least layer protecting film of steel pipe avoids external environment to prefabricated steel pipe to improve the resistance of prefabricated steel pipe
It damages.Above-mentioned prefabricated steel pipe is high dimensional accuracy steel pipe.
As shown in Figure 1, being heat-treated to obtain the mistake of seamless steel pipe to prefabricated steel pipe in the technical solution of embodiment one
Journey includes:
Prefabricated steel pipe is quenched, the temperature of quenching is 920 DEG C~940 DEG C, and is kept the temperature cold after 100min~120min
But.
Prefabricated steel pipe after cooling is tempered, the temperature of tempering is 660 DEG C~680 DEG C, and keep the temperature 120min~
It is air-cooled after 150min, to obtain seamless steel pipe.
In above-mentioned heat treatment process, alloys producing is fully played, and then improves steel duct metallographic group
The stability knitted improves the plasticity and toughness of seamless steel pipe.
Embodiment one additionally provides a kind of drilling water-separation pipe, including seamless steel pipe, and seamless steel pipe is above-mentioned production method
Prepared seamless steel pipe.Using above-mentioned seamless steel pipe production drilling water-separation pipe not only yield strength with higher and
Tensile strength has preferable low-temperature flexibility and dimensional accuracy, also to guarantee seamless steel pipe normal use in the presence of a harsh environment.On
The properties for the seamless steel pipe stated are able to satisfy the requirement of drilling water-separation pipe, and can achieve Offshore Drilling Riser
Requirement, to be used in ocean.
Embodiment two
The production method of the seamless steel pipe of embodiment two, wherein embodiment two and embodiment one the difference is that:
(1) smelting of blank
The ratio addition production marine worker pipe kind of molten iron and 500kg/t is added according to the ratio of 500kg/t and is generated useless
Steel is as raw material, by 45 tons of electric furnace smeltings, 45 tons of refining furnaces refinings, and be added in smelting process 2.5kg/t ferrosilicon,
17kg/t low-carbon ferromanganese, 2.0kg/t vanadium iron, 11kg/t chromic carbide iron, 9kg/t molybdenum-iron and a small amount of aluminium wire and ferrotianium, by above-mentioned original
Material carries out the vacuum metling of molten steel using 45 tons of vacuum outgas furnace technologies；Then continuous casting is carried out using round billet circular-arc type continuous casting machine；?
In the above process, refining furnace ladle bull ladle liquid steel temperature=± 10 DEG C of liquidus temperature+(70~90) are controlled；Baking of tundish
3.5 hours, 1100 DEG C of baking temperature or more；Drawing speed is controlled in 0.550m/min；The vibration frequency adjusting range of crystallizer
For 200opm, amplitude adjusting range ± 2~5mm, offset adjusting range 12~28%；The control of crystallizer cooling water inflow:
4700L/min.After blank is cut scale, slow cooling is carried out.The content of each chemical component in blank is detected, testing result is shown in Table 1.
Table 1
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | Nb | Al |
| Content (wt%) | 0.10 | 0.30 | 1.45 | 0.008 | 0.001 | 0.32 | 0.28 | 0.20 | 0.03 | 0.021 |
(2) Steel Tube Rolling
Blank heating: it usesBlank production, blank is added in annular furnace according to the heating cycle of table 2
Heat.
Table 2
Rolling: use pass forPilger Pilger rolling unit rolled, the feed quantity of hollow billet exists
60mm, roll rotational speed control are controlled in 35rpm, wind pressure in 4.5bar, and obtaining specification isPre- pipe.
(3) steel pipe thermal expansion
Equipment inspection: confirm whether the execution state of equipment is good, whether each button of operation bench can normal control；And to machine
Device is checked item by item；
By the part of above-mentioned pre- pipe using mid-frequency induction heating between 810~850 DEG C, and with 70mm per minute before
Thermal expansion is carried out into speed, obtained specification isHollow forging；
It is measured using sonigauge, selects a section at interval of 1000mm long on length of steel pipe direction, it is each to cut
16 points of planar survey, determine that grid lines measures, wall thickness tolerance need to reach -10%~+10%S；
(4) Steel Pipe Cold
Supplied materials pipe is examined: being confirmed item by item to the steel grade of supplied materials pipe, heat (batch) number, specification, number and quality condition；Come
Material does not allow to have the defects of folding, crackle and pit；Both ends should trim, impulse- free robustness.
Pickling: supplied materials hollow forging base is put into descaling bath, to wash away the oxide layer of steel tube surface, descaling bath is according to every liter
Corrosion inhibiter is added in 0.2 gram of ratio, and installation pickling shaker machine stirs in descaling bath above descaling bath, pickling time 80min, acid
Washing temperature is 45 DEG C, and acid solution mass concentration is 18%, is rinsed 3 times after taking-up with high pressure clear water, is placed on inclination after washing immediately
Cape on, hold towards lower one side, be conducive to clear water and flow away.
Phosphatization: the chemical overlay film of hollow forging Surface Creation trbasic zinc phosphate after pickling, phosphoric acid zinc concentration 32%, phosphating solution temperature
65 DEG C, phosphating time 40min, the hollow forging after obtaining phosphatization；
Saponification: the hollow forging after phosphatization carries out saponification process, makes to form metallic soap lubricating film coated, saponification temperature 70 on overlay film
DEG C, saponification time 30min, saponification liquor pH value 9, the hollow forging after being saponified；
Cold-drawn: carrying out cold-drawn to the above-mentioned hollow forging after saponification on drawbench, and cold-drawn speed is 0.9 meter per minute, is made
Specification isOutside diameter tolerance is ± 1.0mm, and wall thickness deviation is the high dimensional accuracy pipe of ± 2.0mm.
(5) it is heat-treated
Specification high dimensional accuracy steel pipe is heated to 920 DEG C, and soaking time 110min, then comes out of the stove
It is rapidly cooled to room temperature using water quenching, cooling time is 60 seconds to steel pipe in water；Then the tempering insulation time at 660 DEG C
It is air-cooled to room temperature after 140min, obtains the seamless steel pipe of embodiment two.
The size of any 3 seamless steel pipes of embodiment two is measured, measurement result is shown in Table 3；According to " steel product power
Learn the standard method and definition of performance test " specified in method tension test and impact are carried out to the seamless steel pipe of embodiment two
Test, test result are shown in Table 4.
Table 3
Table 4
It should be noted that two row data in the embodiment measured in above-mentioned table are respectively the test at the both ends of steel pipe
As a result, the test result of the first behavior first end, the test result of the second behavior second end, following embodiment three and example IV
Two row test results it is such.
The dimensional accuracy of product is fully able to meet sea within the scope of standard requirements it can be seen from the data in table 3
The requirement of foreign drilling riser heavy caliber X80 steel-grade seamless steel pipe；The steel pipe of embodiment two it can be seen from the data in table 4
Yield strength, tensile strength, elongation, the customer requirement of low-temperature impact work and X80 steel-grade it is almost suitable or even higher, especially
It is that low-temperature impact work is far superior to customer requirement, therefore, is used using the marine drilling water proof that the manufacturing method of the application obtains
Tensile property, impact flexibility and the dimensional accuracy of heavy caliber high-strength seamless steel pipe are very excellent, can satisfy marine drilling
Requirement.
Embodiment three
The production method of the seamless steel pipe of embodiment three, wherein embodiment three and embodiment two the difference is that:
The ratio addition production marine worker pipe kind of molten iron and 500kg/t is added according to the ratio of 500kg/t and is generated useless
Steel, as raw material, by 45 tons of electric furnace smeltings, 45 tons of refining furnaces refinings, and be added in smelting process 2.5kg/t ferrosilicon,
17kg/t low-carbon ferromanganese, 2.0kg/t vanadium iron, 11kg/t chromic carbide iron, 9kg/t molybdenum-iron and a small amount of aluminium wire and ferrotianium, by above-mentioned original
Material carries out the vacuum metling of molten steel using 45 tons of vacuum outgas furnace technologies；Then continuous casting is carried out using round billet circular-arc type continuous casting machine；?
In the above process, refining furnace ladle bull ladle liquid steel temperature=± 10 DEG C of liquidus temperature+(70~90) are controlled；Baking of tundish
3.5 hours, 1100 DEG C of baking temperature or more；Drawing speed is controlled in 0.610m/min；The vibration frequency adjusting range of crystallizer
210opm, amplitude adjusting range ± 2~5mm, offset adjusting range 12~28%；Crystallizer cooling water inflow control: 4700L/
min.After blank is cut scale, slow cooling is carried out.The content of each chemical component in blank is detected, testing result is shown in Table 5.
Table 5
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | V | Al |
| Content (wt%) | 0.11 | 0.32 | 1.48 | 0.007 | 0.001 | 0.35 | 0.26 | 0.18 | 0.02 | 0.025 |
(2) Steel Tube Rolling
Blank heating: it usesBlank production, blank is added in annular furnace according to the heating cycle of table 6
Heat.
Table 6
Rolling: use pass forPilger Pilger rolling unit rolled, the feed quantity of hollow billet exists
60mm, roll rotational speed control are controlled in 35rpm, wind pressure in 4.5bar, and obtaining specification isPre- pipe.
(3) steel pipe thermal expansion
Equipment inspection: confirm whether the execution state of equipment is good, whether each button of operation bench can normal control；And to machine
Device is checked item by item；
By the part of above-mentioned pre- pipe using mid-frequency induction heating between 810~850 DEG C, and with 70mm per minute before
Thermal expansion is carried out into speed, obtained specification isHollow forging；
It is measured using sonigauge, selects a section at interval of 1000mm long on length of steel pipe direction, it is each to cut
16 points of planar survey, determine that grid lines measures, wall thickness tolerance need to reach -10%~+10%S；
(4) Steel Pipe Cold
Supplied materials pipe is examined: being confirmed item by item to the steel grade of supplied materials pipe, heat (batch) number, specification, number and quality condition；Come
Material does not allow to have the defects of folding, crackle and pit；Both ends should trim, impulse- free robustness.
Pickling: supplied materials hollow forging base is put into descaling bath, to wash away the oxide layer of steel tube surface, descaling bath is according to every liter
Corrosion inhibiter is added in 0.2 gram of ratio, and installation pickling shaker machine stirs in descaling bath above descaling bath, pickling time 80min, acid
Washing temperature is 45 DEG C, and acid solution mass concentration is 18%, is rinsed 3 times after taking-up with high pressure clear water, is placed on inclination after washing immediately
Cape on, hold towards lower one side, be conducive to clear water and flow away.
Phosphatization: the chemical overlay film of hollow forging Surface Creation trbasic zinc phosphate after pickling, phosphoric acid zinc concentration 32%, phosphating solution temperature
65 DEG C, phosphating time 40min, the hollow forging after obtaining phosphatization；
Saponification: the hollow forging after phosphatization carries out saponification process, makes to form metallic soap lubricating film coated, saponification temperature 70 on overlay film
DEG C, saponification time 30min, saponification liquor pH value 9, the hollow forging after being saponified；
Cold-drawn: carrying out cold-drawn to the above-mentioned hollow forging after saponification on drawbench, and cold-drawn speed is 0.9 meter per minute, is made
Specification isOutside diameter tolerance is ± 1.0mm, and wall thickness deviation is the high dimensional accuracy pipe of ± 2.0mm.
(5) it is heat-treated
Specification high dimensional accuracy steel pipe is heated to 940 DEG C, and soaking time 110min, then comes out of the stove
It is rapidly cooled to room temperature using water quenching, cooling time is 60 seconds to steel pipe in water；Then the tempering insulation time at 680 DEG C
It is air-cooled to room temperature after 140min, obtains the seamless steel pipe of embodiment three.
The size of any 3 seamless steel pipes of embodiment three is measured, measurement result is shown in Table 7；According to " steel product power
Learn the standard method and definition of performance test " specified in method tension test and impact are carried out to the seamless steel pipe of embodiment three
Test, test result are shown in Table 8.
Table 7
Table 8
The dimensional accuracy of product is fully able to meet sea within the scope of standard requirements it can be seen from the data in table 7
The requirement of foreign drilling riser heavy caliber X80 steel-grade seamless steel pipe；The steel pipe of embodiment three it can be seen from the data in table 8
Yield strength, tensile strength, elongation, the customer requirement of low-temperature impact work and X80 steel-grade it is almost suitable or even higher, especially
It is that low-temperature impact work is far superior to customer requirement, therefore, is used using the marine drilling water proof that the manufacturing method of the application obtains
Tensile property, impact flexibility and the dimensional accuracy of heavy caliber high-strength seamless steel pipe are very excellent, can satisfy marine drilling
Requirement.
Example IV
The production method of the seamless steel pipe of example IV, wherein example IV and embodiment two the difference is that:
The ratio addition production marine worker pipe kind of molten iron and 500kg/t is added according to the ratio of 500kg/t and is generated useless
Steel, as raw material, by 45 tons of electric furnace smeltings, 45 tons of refining furnaces refinings, and be added in smelting process 2.5kg/t ferrosilicon,
17kg/t low-carbon ferromanganese, 2.0kg/t vanadium iron, 11kg/t chromic carbide iron, 9kg/t molybdenum-iron and a small amount of aluminium wire and ferrotianium, by above-mentioned original
Material carries out the vacuum metling of molten steel using 45 tons of vacuum outgas furnace technologies；Then continuous casting is carried out using round billet circular-arc type continuous casting machine；?
In the above process, refining furnace ladle bull ladle liquid steel temperature=± 10 DEG C of liquidus temperature+(70~90) are controlled；Baking of tundish
3.5 hours, 1100 DEG C of baking temperature or more；Drawing speed is controlled in 0.630m/min；The vibration frequency adjusting range of crystallizer
195opm, amplitude adjusting range ± 2~5mm, offset adjusting range 12~28%；Crystallizer cooling water inflow control: 4700L/
min.After blank is cut scale, slow cooling is carried out.The content of each chemical component in blank is detected, testing result is shown in Table 9.
Table 9
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | V | Al |
| Content (wt%) | 0.12 | 0.31 | 1.42 | 0.006 | 0.001 | 0.30 | 0.31 | 0.21 | 0.02 | 0.022 |
(2) Steel Tube Rolling
Blank heating: it usesBlank production, blank is added in annular furnace according to the heating cycle of table 10
Heat.
Table 10
Rolling: use pass forPilger Pilger rolling unit rolled, the feed quantity of hollow billet exists
60mm, roll rotational speed control are controlled in 35rpm, wind pressure in 4.5bar, and obtaining specification isPre- pipe.
(3) steel pipe thermal expansion
Equipment inspection: confirm whether the execution state of equipment is good, whether each button of operation bench can normal control；And to machine
Device is checked item by item；
By the part of above-mentioned pre- pipe using mid-frequency induction heating between 810~850 DEG C, and with 70mm per minute before
Thermal expansion is carried out into speed, obtained specification isHollow forging；
It is measured using sonigauge, selects a section at interval of 1000mm long on length of steel pipe direction, it is each to cut
16 points of planar survey, determine that grid lines measures, wall thickness tolerance need to reach -10%~+10%S；
(4) Steel Pipe Cold
Supplied materials pipe is examined: being confirmed item by item to the steel grade of supplied materials pipe, heat (batch) number, specification, number and quality condition；Come
Material does not allow to have the defects of folding, crackle and pit；Both ends should trim, impulse- free robustness.
Pickling: supplied materials hollow forging base is put into descaling bath, to wash away the oxide layer of steel tube surface, descaling bath is according to every liter
Corrosion inhibiter is added in 0.2 gram of ratio, and installation pickling shaker machine stirs in descaling bath above descaling bath, pickling time 80min, acid
Washing temperature is 45 DEG C, and acid solution mass concentration is 18%, is rinsed 3 times after taking-up with high pressure clear water, is placed on inclination after washing immediately
Cape on, hold towards lower one side, be conducive to clear water and flow away.
Phosphatization: the chemical overlay film of hollow forging Surface Creation trbasic zinc phosphate after pickling, phosphoric acid zinc concentration 32%, phosphating solution temperature
65 DEG C, phosphating time 40min, the hollow forging after obtaining phosphatization；
Saponification: the hollow forging after phosphatization carries out saponification process, makes to form metallic soap lubricating film coated, saponification temperature 70 on overlay film
DEG C, saponification time 30min, saponification liquor pH value 9, the hollow forging after being saponified；
Cold-drawn: carrying out cold-drawn to the above-mentioned hollow forging after saponification on drawbench, and cold-drawn speed is 0.9 meter per minute, is made
Specification isOutside diameter tolerance is ± 1.0mm, and wall thickness deviation is the high dimensional accuracy pipe of ± 2.0mm.
(5) it is heat-treated
Specification high dimensional accuracy steel pipe is heated to 930 DEG C, and soaking time 110min, then comes out of the stove
It is rapidly cooled to room temperature using water quenching, cooling time is 60 seconds to steel pipe in water；Then the tempering insulation time at 670 DEG C
It is air-cooled to room temperature after 140min, obtains the seamless steel pipe of example IV.
The size of any 3 seamless steel pipes of example IV is measured, measurement result is shown in Table 11；According to " steel product
The standard method and definition of mechanical property test " specified in method tension test and punching are carried out to the seamless steel pipe of example IV
Test is hit, test result is shown in Table 12.
Table 11
Table 12
The dimensional accuracy of product is fully able to meet within the scope of standard requirements it can be seen from the data in table 11
The requirement of marine drilling water proof heavy caliber X80 steel-grade seamless steel pipe；The steel of example IV it can be seen from the data in table 12
The yield strength of pipe, tensile strength, elongation, the customer requirement of low-temperature impact work and X80 steel-grade are almost suitable or even higher,
Especially low-temperature impact work is far superior to customer requirement, therefore, the marine drilling water proof obtained using the manufacturing method of the application
It is very excellent with the tensile property of heavy caliber high-strength seamless steel pipe, impact flexibility and dimensional accuracy, it can satisfy offshore drill
The requirement of well.
Embodiment five
The production method of the seamless steel pipe of embodiment five, wherein embodiment five and example IV the difference is that:
The raw material of seamless steel pipe is different, is specifically shown in Table 13.
Table 13
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | V | Al |
| Content (wt%) | 0.11 | 0.33 | 1.45 | 0.006 | 0.001 | 0.50 | 0.10 | 0.23 | 0.02 | 0.021 |
Embodiment six
The production method of the seamless steel pipe of embodiment six, wherein embodiment six and example IV the difference is that:
The raw material of seamless steel pipe is different, is specifically shown in Table 14.
Table 14
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | V | Al |
| Content (wt%) | 0.11 | 0.32 | 1.45 | 0.006 | 0.001 | 0.10 | 0.50 | 0.23 | 0.02 | 0.023 |
Using method same as embodiment two to four to the size of embodiment five and embodiment six and all comparative examples
And performance measures and (for performance, only tests the performance of the first end of each steel pipe), test result is shown in Table 15 and table 16.
Table 15
Table 16
According to the test result in above-mentioned table it is found that when seamless steel pipe (for steel pipe, raw material with it is finally formed
The component of product is identical) include 0.06~0.12% C, 0.20~0.50% Si, 1.30~1.60% Mn, 0.10
~0.50% Cr, 0.10~0.50 Mo, 0.15~0.30% Ni, 0.01~0.05% Nb, be less than or equal to
The Al of 0.015% P, the S less than or equal to 0.003% and 0.010~0.040%, and in the manufacturing process of seamless steel pipe
In, various technological parameters are controlled in preferred range, so that the better performances of seamless steel pipe, and dimensional accuracy is higher.
It can be seen from the above description that the application the above embodiments realize following technical effect:
1), in the raw material of the seamless steel pipe of the application, between control 0.06~0.12%, the intensity of steel pipe can be improved, is changed
The welding performance of kind steel pipe.C content is excessively high, unfavorable to the toughness of steel, increases the cold brittleness and aging sensitivity of steel；C content mistake
It is low, the mechanical property of steel can be reduced；The content of Si element controls between 0.20~0.50%, is both able to achieve oxygen in removing raw material
Effect be able to suppress delta ferrite crystallization again, and then improve the toughness of seamless steel pipe, Si too high levels can promote temper brittleness
Development, reduces plasticity；Mn content controls between 1.30~1.60%, can improve the harden ability and hot-workability of raw material
Can, stable austenite tissue, and the corrosion resistance of seamless steel pipe will not be made to decline because of Mn too high levels and expand γ phase region
Austenite；The control of Cr content cooperates with Mn element 0.10~0.50%, can improve the harden ability of raw material, is returning
The carbide of Cr has under short time heating compared with indissoluble solution and hinders the crystal grain effect of growing up, improve steel belt roof bolt stability when fiery；Mo
Content controls between 0.10~0.50%, by the intensity of its phase transformation strengthening and the performance boost seamless steel pipe of solution strengthening and
Toughness, while temper brittleness can be reduced, but Mo too high levels will lead to the appearance of ferrite δ phase or other brittlement phases and make tough
Property reduce；Ni is as its higher cost of precious metal element, and Ni content controls between 0.15~0.30%, in reasonable control cost
On the basis of the harden ability of raw material can be significantly increased, and then improve the intensity of seamless steel pipe；The control of Nb content 0.01~
Between 0.05%, coarse grains in Steel Tube Heat Treatment Process are able to suppress, and is able to suppress coarse carbonitride and occurs
It is precipitated, and then optimizes the toughness of steel pipe；Meanwhile Al content control is between 0.01~0.04%.Al is the good deoxidier of steel,
Fine crushing, submicroscopic the oxide of height is produced, crystal grain when preventing steel from heating in steel body product is scattered in and grows up, and make it
Content can be effectively prevented from field trash below 0.04% to be occurred with bulk so that the toughness of seamless steel pipe reduces and surface occurs
Defect.S and P is harmful element, and content wants strict control, and P content control is 0.015% hereinafter, the control of S content exists
0.003% hereinafter, less P and S can reduce the field trash in steel, improve the degree of purity of steel, further increase the toughness of steel.
The seamless steel pipe not only yield strength and tensile strength with higher that the raw material is formed, also have preferable low temperature
Toughness and dimensional accuracy.
2), the prepared seamless steel pipe of the production method of the application, not only yield strength and tension with higher are strong
Degree also has preferable low-temperature flexibility and dimensional accuracy.Its outside diameter tolerance is ± 1.0mm, and wall thickness deviation is ± 2.0mm, surrender
Intensity reaches 555MPa or more, and tensile strength reaches 625MPa or more, and laterally full-scale ballistic work reaches -20 DEG C of Charpy V-types
150J or more, shearing ratio reach 85% or more, and it is requirement that properties, which are able to satisfy Offshore Drilling Riser, realizes material
Material high intensity, the good fitting of high tenacity and high dimensional accuracy.
3), the Offshore Drilling Riser of the application not only has higher due to including above-mentioned heavy caliber seamless steel pipe
Yield strength and tensile strength, also have preferable low-temperature flexibility and dimensional accuracy, can satisfy marine drilling application need
It asks.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements: the steel alloy
In, the content of C is controlled between 0.06%~0.12%, can improve the intensity of steel pipe, improves the welding performance of steel pipe.C content
It is excessively high, it is unfavorable to the toughness of steel, increase the cold brittleness and aging sensitivity of steel；C content is too low, can reduce the mechanical property of steel；
The content of Si element controls between 0.20%~0.50%, is not only able to achieve the effect of oxygen in removing raw material but also is able to suppress δ iron
Ferritic crystallization, and then the toughness of seamless steel pipe is improved, Si too high levels can promote the development of temper brittleness, reduce plasticity；Mn
Content controls between 1.30%~1.60%, can improve the harden ability and hot-working character of raw material, stable austenite tissue,
The corrosion resistance of seamless steel pipe will not be made to decline the austenite for expanding γ phase region because of Mn too high levels again；The control of Cr content
It 0.10%~0.50%, cooperates with Mn element, the harden ability of raw material can be improved, the carbide of Cr is more difficult in tempering
Dissolution has under short time heating and hinders the crystal grain effect of growing up, improves steel belt roof bolt stability；The control of Mo content 0.10%~
Between 0.50%, by the intensity and toughness of its phase transformation strengthening and the performance boost seamless steel pipe of solution strengthening, while it can drop
Low temper brittleness, but Mo too high levels will lead to the appearance of ferrite δ phase or other brittlement phases and reduce toughness；Ni is as expensive
Its higher cost of metallic element, Ni content control between 0.15%~0.30%, can be big on the basis of reasonable control cost
The harden ability of raw material is improved to amplitude, and then improves the intensity of seamless steel pipe；Nb content controls between 0.01%~0.05%,
Coarse grains in Steel Tube Heat Treatment Process are able to suppress, and is able to suppress coarse carbonitride and is precipitated, Jin Eryou
Change the toughness of steel pipe；Meanwhile Al content control is between 0.01%~0.04%.Al is the good deoxidier of steel, produces height
Fine crushing, submicroscopic oxide is spent, crystal grain when preventing steel from heating in steel body product is scattered in and grows up, and its content is made to exist
0.04% or less, which can be effectively prevented from field trash, occurs with bulk so that the toughness of seamless steel pipe reduces and surface defect occurs.S
Be harmful element with P, content wants strict control, P content control 0.015% hereinafter, the control of S content 0.003% with
Under, less P and S can reduce the field trash in steel, improve the degree of purity of steel, further increase the toughness of steel.The raw material is formed
Seamless steel pipe not only yield strength and tensile strength with higher, also there is preferable low-temperature flexibility and dimensional accuracy.This
The technical solution of invention efficiently solves the production requirement that alloy steel material in the prior art is unable to satisfy drilling water-separation pipe
The problem of.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of steel alloy, which is characterized in that calculate in percentage by weight, the steel alloy include: Fe, C, Si, Mn, Cr,
Mo, Ni, Nb, P, S and Al；
Wherein, the content of each component are as follows: 0.06%≤C≤0.12%, 0.20%≤Si≤0.50%, 1.30%≤Mn≤
1.60%, 0.10%≤Cr≤0.50%, 0.10%≤Mo≤0.50,0.15%≤Ni≤0.30%, 0.01%≤Nb≤
0.05%, 0.010%≤Al≤0.040%, P≤0.015%, S≤0.003%.
2. steel alloy according to claim 1, which is characterized in that the content of the Cr in the steel alloy are as follows: 0.20%≤
Cr≤0.40%.
3. steel alloy according to claim 1, which is characterized in that the content of the Mo in the steel alloy are as follows: 0.20%≤
Mo≤0.40%.
4. a kind of seamless steel pipe, the seamless steel pipe is made of steel alloy, which is characterized in that the steel alloy is claim
Steel alloy described in any one of 1 to 3.
5. a kind of its production method of seamless steel pipe, which is characterized in that the seamless steel pipe is seamless steel as claimed in claim 4
Pipe, the step of production method include:
The steel alloy is smelted to obtain blank；
The blank is successively heated, is perforated, rolling pre- pipe；
Thermal expansion is carried out to the pre- pipe and obtains hollow forging；
Cold-drawn is carried out to the hollow forging and obtains prefabricated steel pipe；
The prefabricated steel pipe is heat-treated to obtain the seamless steel pipe.
6. its production method of seamless steel pipe according to claim 5, which is characterized in that the steel alloy into smelting step
Suddenly include:
Electric furnace smelting is carried out to the raw material of the steel alloy, and obtains just base；
External refining is carried out to the just base, to obtain smart base；
Vacuum outgas is carried out to the smart base and carries out arc continuous casting, to obtain blank.
7. its production method of seamless steel pipe according to claim 6, which is characterized in that the essence base uses arc continuous casting
Machine carries out arc continuous casting；
The circular-arc type continuous casting machine includes crystallizer, and the crystallizer is during the arc continuous casting, the crystallizer control
Drawing speed between 0.4m/min~0.6m/min, the vibration frequency of the crystallizer between 160opm~220opm,
The amplitude of the crystallizer between 2mm~5mm, control the offset adjusting range of the crystallizer 12%~28% it
Between.
8. its production method of seamless steel pipe according to claim 5, which is characterized in that the making step of the pre- pipe
Include:
By the blank heating to 1240 DEG C~1260 DEG C, and 3h~3.5h is kept the temperature, to obtain hot blank；
The hot blank is subjected to cone-type piercer at 1130 DEG C~1200 DEG C, to obtain hollow billet；
The hollow billet is subjected to tube rolling, to obtain the pre- pipe.
9. its production method of seamless steel pipe according to claim 8, which is characterized in that the heating process of the blank according to
It is secondary include preheating section heating, I section heating of heating, II section heating of heating, heat III sections heat, I sections of soaking and II sections of soaking；
Wherein, the blank heating is greater than or equal to 10h at the heating time of the hot blank, and the preheating section heating will be described
The temperature of blank is heated to 970 DEG C~990 DEG C, I section of the heating heat by the temperature of the blank be heated to 1090 DEG C~
1110 DEG C, the temperature of the blank is heated to 1170 DEG C~1190 DEG C by II sections of heating of the heating, III sections of heating heating
The temperature of the blank is heated to 1220 DEG C~1260 DEG C, described soaking I sections and soaking II sections of the temperature is maintained at
1240~1260 DEG C, after described soaking I sections and the soaking II sections of heat preservations 3h~3.5h, obtain the hot blank.
10. its production method of seamless steel pipe according to claim 8, which is characterized in that the blank to the pre- pipe
In the process of base, the hollow billet carries out tube rolling using Pilger rolling unit and controls the hollow billet during tube rolling
Feed quantity controls the roll rotational speed of the Tube Rolling Train between 25rpm~60rpm between 50mm~80mm, same to time control
The wind pressure of the roll is made between 5.5bar~7bar.
11. its production method of seamless steel pipe according to claim 5, which is characterized in that the pre- pipe to the famine
The process of pipe includes:
By the part of the pre- pipe using mid-frequency induction heating to 810 DEG C~850 DEG C, to obtain heat pipe base；
The heat pipe base is subjected to thermal expansion with the forward speed of 60mm~80mm per minute, to obtain hollow forging.
12. its production method of seamless steel pipe according to claim 11, which is characterized in that the hollow forging is to described prefabricated
The process of steel pipe includes:
The hollow forging is put into the descaling bath for fill hydrochloric acid solution and carries out pickling, the mass concentration control of the hydrochloric acid solution exists
Between 10%~20%, pickling time controls the hollow forging between 60min~100min, after obtaining pickling；
Hollow forging after the pickling is subjected to outer surface phosphorating treatment using zinc phosphate solution, is covered with generating the chemistry of trbasic zinc phosphate
The mass concentration of film, the zinc phosphate solution controls between 30%~35%, and the temperature of the zinc phosphate solution is controlled 60
DEG C~70 DEG C between, hollow forging phosphating time after the pickling controls between 30min~50min, to obtain the famine after phosphatization
Pipe；
Hollow forging after the phosphatization is subjected to saponification process by saponification liquor, its surface is made to form metallic soap lubricating film coated, it is described
Temperature in saponification process controls between 60 DEG C~80 DEG C, and the time of the saponification controls the institute between 20min~35min
State hollow forging of the saponification liquor pH value control between 8.5~9.5, after being saponified；
Hollow forging after the saponification is subjected to cold-drawn process by drawbench, 600 tons of the drawbench draft is described cold
The cold-drawn speed of drawing machine obtains prefabricated steel pipe between 0.85m/min~1.0m/min.
13. its production method of seamless steel pipe according to claim 5, which is characterized in that carried out to the prefabricated steel pipe
Heat treatment obtains the process of the seamless steel pipe
The prefabricated steel pipe is quenched, the temperature of the quenching is 920 DEG C~940 DEG C, and keeps the temperature 100min~120min
After cool down；
The prefabricated steel pipe after cooling is tempered, the temperature of the tempering is 660 DEG C~680 DEG C, and keeps the temperature 120min
It is air-cooled after~150min, to obtain the seamless steel pipe.
14. a kind of drilling water-separation pipe, including seamless steel pipe, which is characterized in that the seamless steel pipe is to appoint in claim 4 to 13
The prepared seamless steel pipe of production method described in one.
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| CN111112337A (en) * | 2019-12-16 | 2020-05-08 | 太原重工工程技术有限公司 | Method for manufacturing seamless steel pipe with large-diameter wall ratio |
| CN113088817A (en) * | 2021-03-30 | 2021-07-09 | 哈马维工程技术(上海)有限公司 | Seamless steel tube, preparation method thereof and oil cylinder |
| CN114480794A (en) * | 2021-12-29 | 2022-05-13 | 马鞍山市鑫龙特钢有限公司 | Isothermal normalizing process for Fe-Si alloy steel |
| CN114774784A (en) * | 2022-04-06 | 2022-07-22 | 江苏龙山管件有限公司 | Large-caliber alloy steel pipe fitting and machining process thereof |
| CN115351113A (en) * | 2022-10-21 | 2022-11-18 | 江苏立万精密制管有限公司 | Preparation method of high-strength high-toughness seamless steel pipe |
| CN115415325A (en) * | 2022-08-26 | 2022-12-02 | 大冶特殊钢有限公司 | Manufacturing method for rolling seamless steel tube by high-carbon chromium bearing steel continuous casting round billet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111112337A (en) * | 2019-12-16 | 2020-05-08 | 太原重工工程技术有限公司 | Method for manufacturing seamless steel pipe with large-diameter wall ratio |
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| CN114774784A (en) * | 2022-04-06 | 2022-07-22 | 江苏龙山管件有限公司 | Large-caliber alloy steel pipe fitting and machining process thereof |
| CN114774784B (en) * | 2022-04-06 | 2023-09-26 | 江苏龙山管件有限公司 | Large-caliber alloy steel pipe fitting and processing technology thereof |
| CN115415325A (en) * | 2022-08-26 | 2022-12-02 | 大冶特殊钢有限公司 | Manufacturing method for rolling seamless steel tube by high-carbon chromium bearing steel continuous casting round billet |
| CN115351113A (en) * | 2022-10-21 | 2022-11-18 | 江苏立万精密制管有限公司 | Preparation method of high-strength high-toughness seamless steel pipe |
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