CN108531828A - Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application - Google Patents
Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application Download PDFInfo
- Publication number
- CN108531828A CN108531828A CN201810155681.7A CN201810155681A CN108531828A CN 108531828 A CN108531828 A CN 108531828A CN 201810155681 A CN201810155681 A CN 201810155681A CN 108531828 A CN108531828 A CN 108531828A
- Authority
- CN
- China
- Prior art keywords
- heating
- steel pipe
- seamless steel
- blank
- temperature
- 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.)
- Pending
Links
Classifications
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and applications.Wherein, the weight percent of the chemical constituent of the medium caliber heavy wall low temperature seamless steel pipe is C 0.12~0.20%, Si 0.10~0.40%, Mn 1.00~1.50%, P≤0.015%, S≤0.003%, Cr 0.90~1.30%, Mo 0.40~0.80%, Ni 1.10~1.70%, Al 0.01~0.05%, surplus are iron Fe and inevitable impurity.Apply the technical scheme of the present invention, it is stringent to control each chemical constituent content in raw material, by reasonably being matched between each chemical constituent, so as to get seamless steel pipe intensity and toughness disclosure satisfy that polar region and marine environment high-strength structure steel pipe particular/special requirement.
Description
Technical field
The present invention relates to steel tube fabrication technique field, in particular to a kind of medium caliber heavy wall low temperature seamless steel pipe,
Its manufacturing method and application.
Background technology
With the continuous exploration and development of polar region and ocean area oil, natural gas resource, medium caliber thick section and high strength is low
The demand of temperature seamless steel pipe is continuously increased, and has very high requirement to the intensity, low-temperature flexibility and welding performance of product.
Currently, domestic other seamless steel pipe enterprises cannot achieve external diametrical extent in 300~400mm, medium caliber of the wall thickness more than 40mm is thick
The production of wall seamless steel pipe.The medium caliber thick section and high strength cryogenic steel pipe used both at home and abroad is mostly welded tube, passes through big swaged forging
Press will again be welded after plate forming, and medium caliber thick section and high strength cryogenic steel pipe is produced to being molded work using welding procedure
Skill and welding process requirement are very high, and the corresponding production cycle is longer, and production cost is higher.
It is more than the steel pipe of 40mm for wall thickness, on the basis of ensureing certain welding performance, how realizes the same of high intensity
When, it is always the technical barrier of Steel Tube Industry, good chemical composition and obdurability to keep preferable low-temperature impact toughness
With the integrated use for being related to multinomial material toughening technology.
Invention content
The present invention is intended to provide a kind of medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application, to ensure
On the basis of certain welding performance, higher-strength, the low-temperature impact toughness of medium caliber thick-walled seamless steel pipes is improved.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of medium caliber heavy wall low temperature is with seamless
Steel pipe.The weight percent of the chemical constituent of the medium caliber heavy wall low temperature seamless steel pipe is C 0.12~0.20%, Si 0.10
~0.40%, Mn 1.00~1.50%, P≤0.015%, S≤0.003%, Cr 0.90~1.30%, Mo 0.40~
0.80%, Ni 1.10~1.70%, Al 0.01~0.05%, surplus are iron Fe and inevitable impurity；Preferably, middle mouth
The weight percent of the chemical constituent of diameter heavy wall low temperature seamless steel pipe is C 0.15~0.18%, Si 0.20~0.25%, Mn
1.30~1.40%, P≤0.015%, S≤0.003%, Cr 1.00~1.15%, Mo 0.50~0.55%, Ni 1.40~
1.50%, Al 0.025~0.035%, surplus are iron Fe and inevitable impurity.
According to an aspect of the invention, there is provided a kind of manufacturer of above-mentioned medium caliber heavy wall low temperature seamless steel pipe
Method.The manufacturing method includes the following steps：Step S1, according to the chemical constituent of above-mentioned medium caliber heavy wall low temperature seamless steel pipe into
Row dispensing obtains raw material, and is smelted to obtain blank to raw material；Step S2 carries out hot rolling to blank and obtains pipe；And step
Rapid S3 carries out press quenching to pipe and tempering heat treatment obtains medium caliber heavy wall low temperature seamless steel pipe.
Further, the dispensing of raw material includes a variety of in molten iron, steel scrap, ferroalloy and aluminium in step S1.
Further, it after obtaining raw material in step S1, specifically includes：By raw material by electric furnace smelting, external refining, vacuum
Degassing and arc continuous casting obtain blank.
Further, during carrying out arc continuous casting, casting speed is controlled in 0.5~0.8m/min；Crystallizer shakes
Dynamic frequency is 180~230opm, and amplitude is ± 2~4mm, and offset adjusting range is 10~30%.
Further, step S2 includes：Step S21, by blank heating to 1250~1280 DEG C, and heat preservation 420~
450min obtains hot base；Hot base at 1150~1200 DEG C is carried out cone-type piercer, obtains hollow billet by step S22；Step S23,
Hollow billet is subjected to tube rolling using pipe mill, obtains hollow forging；And step S24, sizing is carried out to hollow forging and obtains pipe.
Further, step S21 is specifically included：Blank is passed through to preheating section heating, I section of heating of heating, heating II successively
Duan Jiare, III section of heating of heating, IV section of heating are heated and are greater than or equal to soaking zone, the total processing time of step S21
420min, wherein the temperature of blank reaches 940~1000 DEG C after preheating section heats, the blank after I section of heating of heating
Temperature reaches 1120~1160 DEG C, and the temperature of blank reaches 1160~1200 DEG C after II section of heating of heating, by heating III
The temperature of blank reaches 1200~1240 DEG C after Duan Jiare, and the temperature of blank reaches 1240~1280 after IV section of heating of heating
DEG C, then after 120~150min of soaking zone soaking of 1250~1270 DEG C of temperature, obtain hot base.
Further, the pipe mill in step S23 is Φ 720Pilger Pilger rolling units, hollow billet during tube rolling
Feed quantity be 20~80mm, the rotating speed of roll is between 530~755rpm, and wind pressure is between 5.5~6.5bar.
Further, step S3 includes：Step S31 carries out press quenching, heat preservation 240 at 930~950 DEG C to pipe
It is quickly cooled down in sink after~270min；And step S32 is tempered pipe after cooling at 650~670 DEG C,
It is air-cooled after 360~400min of tempering time heat preservation to obtain seamless steel pipe.
In accordance with a further aspect of the present invention, provide a kind of above-mentioned medium caliber heavy wall low temperature seamless steel pipe polar region and/
Or it is applied in marine environment.
It applies the technical scheme of the present invention, it is stringent to control each chemical constituent content in raw material, by between each chemical constituent
Rational proportioning, so as to get seamless steel pipe intensity and toughness disclosure satisfy that the high-strength structure of polar region and marine environment is used
The particular/special requirement of steel pipe.
Specific implementation mode
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.Below in conjunction with embodiment, the present invention will be described in detail.
According to a kind of typical embodiment of the present invention, a kind of medium caliber heavy wall low temperature seamless steel pipe is provided.Mouth in this
The weight percent of the chemical constituent of diameter heavy wall low temperature seamless steel pipe is C 0.12~0.20%, Si 0.10~0.40%, Mn
1.00~1.50%, P≤0.015%, S≤0.003%, Cr 0.90~1.30%, Mo 0.40~0.80%, Ni 1.10~
1.70%, Al 0.01~0.05%, surplus are iron Fe and inevitable impurity.
Wherein, C content control can improve the quenching degree of steel between 0.12~0.20%, refine microstructure.C content
It is excessively high, it is unfavorable to the toughness of steel, increase cold brittleness, aging sensitivity and the weld cracking sensibility of steel；C content is too low, can drop
The mechanical property of low steel；Si constituent contents control between 0.10~0.40%, and Si is deoxidier important in steelmaking process, both
It can realize that the effect of oxygen in removing raw material can inhibit delta ferrite to crystallize again, and then improve the toughness of seamless steel pipe, Si content mistakes
Height can promote the development of temper brittleness, and plasticity is made to reduce；Mn contents control between 1.00~1.50%, can improve raw material
Quenching degree, stable austenite tissue expands the austenite of γ phase regions, and raw material crystal grain will not be made thick because of Mn too high levels
Change, cause segregation and crackle occur in strand and increases the superheated susceptivity of steel；The control of Cr contents 0.90~1.30%, with
Mn elements cooperate, and can improve the quenching degree of raw material, and in tempering, the carbide of Cr is compared with indissoluble solution, in the case where the short time heats
Have and hinder the crystal grain effect of growing up, improves steel belt roof bolt stability；Mo contents control between 0.40~0.80%, pass through its phase transformation
Strengthen the intensity and toughness with the performance boost seamless steel pipe of solution strengthening, while temper brittleness can be reduced.But Mo content mistakes
Height can lead to the appearance of ferrite δ phases or other brittlement phases and toughness is made to reduce；Ni contents are controlled 1.10~1.70%, preferably
Between 1.10~1.50%, Ni is among the austenite stabilizing elements, especially most important to the stability of material at low temperature, Ni
The ability for reducing ductile-brittle transition temperature is only second to N, is reduction ductile-brittle transition temperature element best in metallic element, and Ni is conducive to
The quenching degree and intensity of material are improved, while heat affected area and matrix in the cold plasticity and welding region of material can also be improved
The homogeneity of tissue, but Ni is also a kind of more expensive alloying element；Meanwhile Al content control is between 0.01~0.05%.
Al is the good deoxidier of steel, produces fine crushing, submicroscopic the oxide of height, when being scattered in prevention steel heating in steel body product
Crystal grain grow up, and its content is made to can help to the nitridation of steel below 0.05%, thus improve the thermal stability of steel.S and P
It is harmful element, content will be controlled strictly, and therefore, P content control is 0.015% hereinafter, the control of S contents is 0.003%
Below.
Preferably, the weight percent of the chemical constituent of the medium caliber heavy wall low temperature seamless steel pipe be C 0.15~
0.18%, Si 0.20~0.25%, Mn 1.30~1.40%, P≤0.015%, S≤0.003%, Cr 1.00~1.15%,
Mo 0.50~0.55%, Ni 1.40~1.50%, Al 0.025~0.035%, surplus are iron Fe and inevitable impurity.
It applies the technical scheme of the present invention, it is stringent to control each chemical constituent content in raw material, by between each chemical constituent
Rational proportioning, so as to get medium caliber thick-walled seamless steel pipes intensity and toughness disclosure satisfy that the height of polar region and marine environment
The particular/special requirement of strength structure steel pipe.
According to a kind of typical embodiment of the present invention, a kind of system of above-mentioned medium caliber heavy wall low temperature seamless steel pipe is provided
Make method.The manufacturing method includes the following steps：The chemical constituent of step S1, medium caliber heavy wall low temperature seamless steel pipe are matched
Material, obtains raw material, and smelted to obtain blank to raw material；Step S2 carries out hot rolling to blank and obtains pipe；And step
S3 carries out press quenching to pipe and tempering heat treatment obtains medium caliber heavy wall low temperature seamless steel pipe.System using the present invention
The method of making can produce external diametrical extent in 300~400mm, and wall thickness is more than the medium caliber thick-walled seamless steel pipes of 40mm, steel pipe tension
Intensity can reach 800MPa or more, and -60 DEG C of low-temperature impact toughness can reach 150J or more, and properties can meet polar region and sea
The particular/special requirement of the high-strength structure steel pipe of foreign environment realizes the excellent of medium caliber thick-walled seamless steel pipes high intensity and high tenacity
Good matching.
The application is excellent in order to further save the manufacturing cost of seamless steel pipe and obtain the raw material with predetermined chemical ingredient
It includes a variety of in molten iron, steel scrap, ferroalloy and aluminium to select the dispensing of above-mentioned raw materials.Wherein ferroalloy, aluminium wire can smelted
The chemical composition that can not only be supplemented in raw material is added in journey, aluminium wire, which is added in steel to react with oxygen, generates Al2O3, going out
The Al generated when steel, calmness and casting2O3Most of float excludes, and realizes deoxidation purpose.Preferably, raw material is obtained in step S1
Afterwards, it specifically includes：Raw material is obtained into blank by electric furnace smelting, external refining, vacuum outgas and arc continuous casting.Using ability
Conventional electric furnace smelting, external refining, vacuum outgas, arc continuous casting to the raw material after optimization of Chemical Composition smelt in domain
To blank, which has preferable quenching degree.
Preferably, during carrying out arc continuous casting, casting speed is controlled in 0.5~0.8m/min；The vibration of crystallizer
Frequency is 180~230opm, and amplitude is ± 2~4mm, and offset adjusting range is 10~30%.During arc continuous casting, knot
Brilliant device vibrates slag inclusion and bubble floating so that in molten steel with above-mentioned frequency, reduces blank surface slag inclusion, stomata, crackle, and
And detached the green shell of blank and crystallizer inner wall using vibrating device, it both can guarantee that green shell was held with tube wall under vibrating conditions
Continuous separation, and vibration frequency and amplitude are controlled, it ensure that the stable type of separation, avoid the green shell in vibration processes and generate and glue
Knot, in turn results in the generation of circular pipe blank face crack.
According to a kind of typical embodiment of the present invention, step S2 includes：Step S21, by blank heating, and soaking is extremely
1250~1280 DEG C, soaking keeps the temperature 120~150min, obtains hot base；Step S22 carries out hot base at 1150~1200 DEG C
Cone-type piercer obtains hollow billet；Hollow billet is carried out tube rolling using pipe mill, obtains hollow forging by step S23；And step S24, to famine
Pipe carries out sizing and obtains pipe.Its interior tissue is more uniformly distributed after blank heating, and (temperature is to wear at 1130~1200 DEG C
The temperature of hole process, blank are perforated with temperature drop since coming out to heating furnace) under carry out hot piercing cooperation to piercing process parameter
Control obtain the uniform hollow billet of uniform diameter, mechanical property；And then it ensure that the quality of the hollow forging obtained with the hollow billet.
Preferably, step S21 is specifically included：Blank is passed through to preheating section heating, I section of heating of heating, II section of heating successively
Heating, III section of heating of heating, IV section of heating of heating and soaking zone, the total processing time of step S21 are greater than or equal to 420min,
Wherein, the temperature of blank reaches 940~1000 DEG C after preheating section heats, and the temperature of blank reaches after I section of heating of heating
To 1120~1160 DEG C, the temperature of blank reaches 1160~1200 DEG C after II section of heating of heating, by III section of heating of heating
The temperature of blank reaches 1200~1240 DEG C afterwards, and the temperature of blank reaches 1240~1280 DEG C after IV section of heating of heating, so
Afterwards after 120~150min of soaking zone soaking of 1250~1270 DEG C of temperature, hot base is obtained.By above-mentioned heat stepwise, make
Pipe is stepped up to soaking temperature, avoids the too fast defect for causing to crack in hot base of heating rate.
Preferably, the pipe mill in step S23 is Φ 720Pilger Pilger rolling units, hollow billet during tube rolling
Feed quantity is 20~80mm, and the rotating speed of roll is between 530~755rpm, and wind pressure is between 5.5~6.5bar.The Pilger periods
The deformation of formula Tube Rolling Train is three-dimensional compressive stress, has forging effect, is conducive to the compactness of material, to realize improvement nothing
Stitch the purpose of steel duct microstructure.
According to a kind of typical embodiment of the present invention, step S3 includes：Step S41, at 930~950 DEG C, to pipe
It is quenched, is quickly cooled down in sink after keeping the temperature 240~270min；And step S32, at 650~670 DEG C, to cooling
Pipe afterwards is tempered, air-cooled after 360~400min of heat preservation to obtain seamless steel pipe.The quenching and preserving heat 240 at 930~950 DEG C
~270min, ensure that the uniformity of steel pipe austenitizing, while alloy being made at the uniform velocity to be substantially dissolved in austenite；Later quickly
It is cooling, quick water cooling may be used；Then 360~400min of tempering heat preservation at 650~670 DEG C, makes alloying element from satiety
It is fully precipitated in the solid solution of sum, obtains the carbide of disperse and the tissue after tempering is made to tend to stablize, it is air-cooled later.Above-mentioned
In heat treatment process, alloys producing is not fully exerted, and then improves the stability of steel duct metallographic structure, improves
The plasticity and toughness of seamless steel pipe.
According to a kind of typical embodiment of the present invention, seamless steel pipe is given birth to using Φ 720Pilger Pilger rolling techniques
Production, it includes：Pipe inspection → pipe blanking → annular stove heat → tapered roller punch perforation → Φ 720Pilger periodics
Tube Rolling Train hot rolling → stepping furnace reheating → high-pressure water descaling → sizing → press quenching → tempering heat treatment → cold bed cooling
→ physicochemical property inspection → aligning → ultrasonic examination → desk checking → cleaning, mark, packaging → storage.Using the present invention's
Technical solution, a kind of medium caliber thick-walled seamless steel pipes can be obtained, and (outer diameter D range is more than 40mm, D/t in 300~400mm, wall thickness t
10) value is less than, the tensile strength after heat treatment can reach 800MPa or more, and -60 DEG C of low-temperature impact toughness can reach 150J or more,
It can be applied to the high-strength structure steel pipe of polar region and marine environment.
According to a kind of typical embodiment of the present invention, a kind of seamless steel that any of the above-described kind of manufacturing method obtains is provided
Pipe.
Use the weight percent of each chemical constituent in the seamless steel pipe that the present processes obtain for C 0.12~
0.20%, Si 0.10~0.40%, Mn 1.00~1.50%, P≤0.015%, S≤0.003%, Cr 0.90~1.30%,
Mo 0.40~0.80%, Ni 1.10~1.70%, Al 0.01~0.05%, surplus are iron Fe and inevitable impurity, and are adopted
External diametrical extent can be obtained in 300~400mm with the manufacturing method of the application, wall thickness is more than the medium caliber heavy wall seamless steel of 40mm
Pipe, steel pipe tensile strength can reach 800MPa or more, and -60 DEG C of low-temperature impact toughness can reach 150J or more, have higher strong
Degree, low-temperature flexibility and good welding performance, properties are fully able to meet the high-strength structure of polar region and marine environment
With the particular/special requirement of steel pipe, the good fitting of medium caliber thick-walled seamless steel pipes high intensity and high tenacity is realized.
According to a kind of typical embodiment of the present invention, a kind of above-mentioned medium caliber heavy wall low temperature seamless steel pipe is provided in pole
It is applied in ground and/or marine environment.
Below with reference to embodiment, the advantageous effect of the application is further illustrated.
Embodiment by way of example only, can not limit protection scope of the present invention, for those skilled in the art
Speech can suitably adjust chemical composition in raw material under the enlightenment and introduction of the present invention according to the performance requirement of product steel pipe
Composition and heating condition.
Embodiment 1
(1) smelting of blank
The ratio that molten iron and 500kg/t are added according to the ratio of 500kg/t adds high-quality steel scrap, as raw material, by 45
Ton electric furnace smelting, the refining of 45 tons of refining furnaces, and be added in smelting process 2.1kg/t ferrosilicon, 24kg/t low-carbon ferromanganeses,
Above-mentioned raw materials are used 45 tons of vacuum by 1.3kg/t vanadium iron, 18kg/t chromic carbide irons, 11kg/t molybdenum-irons and a small amount of aluminium wire and ferrotianium
The furnace technology that deaerates carries out the vacuum metling of molten steel；Then round billet circular-arc type continuous casting machine is used to carry out continuous casting；In above process, it controls
Refining furnace ladle bull ladle liquid steel temperature=± 10 DEG C of liquidus temperature+(60~80)；Baking of tundish 4.5 hours, baking temperature
1100 DEG C or more；Casting speed is controlled in 0.750m/min；The vibration frequency adjusting range 215opm of crystallizer, amplitude adjust model
Enclose ± 2~4mm, offset adjusting range 10~30%；Crystallizer cooling water inflow controls：4800L/min.Blank is cut into scale
Afterwards, slow cooling is carried out.The content of each chemical composition in blank is detected, testing result is shown in Table 1.
Table 1
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | Al |
| Content (wt%) | 0.17 | 0.25 | 1.32 | 0.008 | 0.001 | 1.15 | 0.55 | 1.45 | 0.031 |
(2) Steel Tube Rolling
The heating of blank：UsingBlank produces, and blank is carried out in annular furnace according to the heating cycle of table 2
Heating.
Table 2
Cone-type piercer：It preparesWhen seamless steel pipe, cone-type piercer, base are carried out at being 1195 DEG C in piercing temperature
Expect that diameter total reduction is 15%, roll spacing 450mm, roll feed angle is 6 °, and roll roll off angle is 5 °, and obtaining dimensions isHollow billet.
Rolling：Use pass forPilger Pilger rollings unit above-mentioned hollow billet is rolled, hollow billet
Feed quantity is controlled in 650rpm, wind pressure in 6bar in 50mm, roll rotational speed control, and obtaining specification isHollow forging.
Hot size：By the hollow forging after de- stick after step-by-step movement reheating furnace is heated to 950 DEG C, pass through the high pressure water of 25MPa
Dephosphorization apparatus, 3 framves mutually abut and the three-roll sizing mill frame of tandem on carry out Sizing Process, obtained specification is
Pipe.
(3) it is heat-treated
Specification steel pipe is heated to 940 ± 10 DEG C, and soaking time 240min, then comes out of the stove fast using water quenching
Speed is cooled to room temperature, and cooling time is 180 seconds to steel pipe in water；Then at 660 ± 10 DEG C after tempering insulation time 360min
It is air-cooled to room temperature, obtains the seamless steel pipe of embodiment 1.
The size of arbitrary 10 seamless steel pipes of embodiment 1 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 stretching examination is carried out to arbitrary two seamless steel pipes of embodiment 1
It tests and impact test, test result is shown in Table 4.
Table 3
Table 4
The dimensional accuracy of product is fully able to meet within standard claimed range it can be seen from the data in table 3
The requirement of 100ksi grade of steel low temperature seamless steel pipes；It can be seen from the data in table 4 yield strength of the steel pipe of embodiment 1,
Tensile strength, elongation, the customer requirement of low-temperature impact work and 100ksi grade of steels are almost suitable or even higher, especially low temperature
Ballistic work is far superior to customer requirement, and therefore, the tensile property of the seamless steel pipe obtained using the manufacturing method of the application is impacted
Toughness and dimensional accuracy are very excellent, can be suitable for polar region and the special of high-strength structure steel pipe of marine environment is wanted
It asks.
Embodiment 2
The ratio that molten iron and 500kg/t are added according to the ratio of 500kg/t adds high-quality steel scrap, as raw material, by 45
Ton electric furnace smelting, the refining of 45 tons of refining furnaces, and be added in smelting process 2.1kg/t ferrosilicon, 24kg/t low-carbon ferromanganeses,
Above-mentioned raw materials are used 45 tons of vacuum by 1.3kg/t vanadium iron, 18kg/t chromic carbide irons, 11kg/t molybdenum-irons and a small amount of aluminium wire and ferrotianium
The furnace technology that deaerates carries out the vacuum metling of molten steel；Then round billet circular-arc type continuous casting machine is used to carry out continuous casting；In above process, it controls
Refining furnace ladle bull ladle liquid steel temperature=± 10 DEG C of liquidus temperature+(60~80)；Baking of tundish 4.5 hours, baking temperature
1100 DEG C or more；Casting speed is controlled in 0.750m/min；The vibration frequency adjusting range 215opm of crystallizer, amplitude adjust model
Enclose ± 2~4mm, offset adjusting range 10~30%；Crystallizer cooling water inflow controls：4800L/min.Blank is cut into scale
Afterwards, slow cooling is carried out.The content of each chemical composition in blank is detected, testing result is shown in Table 5.
Table 5
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | Al |
| Content (wt%) | 0.16 | 0.21 | 1.35 | 0.006 | 0.001 | 1.09 | 0.52 | 1.47 | 0.033 |
(2) Steel Tube Rolling
The heating of blank：UsingBlank produces, and blank is carried out in annular furnace according to the heating cycle of table 6
Heating.
Table 6
Cone-type piercer：It preparesWhen seamless steel pipe, cone-type piercer, base are carried out at being 1195 DEG C in piercing temperature
Expect that diameter total reduction is 15%, roll spacing 450mm, roll feed angle is 6 °, and roll roll off angle is 5 °, and obtaining dimensions isHollow billet.
Rolling：Use pass forPilger Pilger rollings unit above-mentioned hollow billet is rolled, hollow billet
Feed quantity is controlled in 650rpm, wind pressure in 6bar in 50mm, roll rotational speed control, and obtaining specification isHollow forging.
Hot size：By the hollow forging after de- stick after step-by-step movement reheating furnace is heated to 950 DEG C, pass through the high pressure water of 25MPa
Dephosphorization apparatus, 3 framves mutually abut and the three-roll sizing mill frame of tandem on carry out Sizing Process, obtained specification is
Pipe.
(3) it is heat-treated
Specification high dimensional accuracy steel pipe is heated to 940 ± 10 DEG C, and soaking time 260min, then comes out of the stove
Room temperature is quickly cooled to using water quenching, cooling time is 180 seconds to steel pipe in water；When being then tempered heat preservation at 660 ± 10 DEG C
Between be air-cooled to room temperature after 380min, obtain the seamless steel pipe of embodiment 2.
The size of arbitrary 10 seamless steel pipes of embodiment 2 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 stretching examination is carried out to arbitrary two seamless steel pipes of embodiment 2
It tests and impact test, test result is shown in Table 8.
Table 7
Table 8
The dimensional accuracy of product is fully able to meet within standard claimed range it can be seen from the data in table 7
The requirement of 100ksi grade of steel low temperature seamless steel pipes；It can be seen from the data in table 8 yield strength of the steel pipe of embodiment 2,
Tensile strength, elongation, the customer requirement of low-temperature impact work and 100ksi grade of steels are almost suitable or even higher, especially low temperature
Ballistic work is far superior to customer requirement, and therefore, the tensile property of the seamless steel pipe obtained using the manufacturing method of the application is impacted
Toughness and dimensional accuracy are very excellent, can be suitable for polar region and the special of high-strength structure steel pipe of marine environment is wanted
It asks.
Embodiment 3
The ratio that molten iron and 500kg/t are added according to the ratio of 500kg/t adds high-quality steel scrap, as raw material, by 45
Ton electric furnace smelting, the refining of 45 tons of refining furnaces, and be added in smelting process 2.1kg/t ferrosilicon, 24kg/t low-carbon ferromanganeses,
Above-mentioned raw materials are used 45 tons of vacuum by 1.3kg/t vanadium iron, 18kg/t chromic carbide irons, 11kg/t molybdenum-irons and a small amount of aluminium wire and ferrotianium
The furnace technology that deaerates carries out the vacuum metling of molten steel；Then round billet circular-arc type continuous casting machine is used to carry out continuous casting；In above process, it controls
Refining furnace ladle bull ladle liquid steel temperature=± 10 DEG C of liquidus temperature+(60~80)；Baking of tundish 4.5 hours, baking temperature
1100 DEG C or more；Casting speed is controlled in 0.750m/min；The vibration frequency adjusting range 215opm of crystallizer, amplitude adjust model
Enclose ± 2~4mm, offset adjusting range 10~30%；Crystallizer cooling water inflow controls：4800L/min.Blank is cut into scale
Afterwards, slow cooling is carried out.The content of each chemical composition in blank is detected, testing result is shown in Table 9.
Table 9
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | Al |
| Content (wt%) | 0.17 | 0.23 | 1.36 | 0.009 | 0.001 | 1.12 | 0.53 | 1.48 | 0.035 |
(2) Steel Tube Rolling
The heating of blank：UsingBlank produces, and blank is carried out in annular furnace according to the heating cycle of table 10
Heating.
Table 10
Cone-type piercer：It preparesWhen seamless steel pipe, cone-type piercer, base are carried out at being 1195 DEG C in piercing temperature
Expect that diameter total reduction is 15%, roll spacing 450mm, roll feed angle is 6 °, and roll roll off angle is 5 °, and obtaining dimensions isHollow billet.
Rolling：Use pass forPilger Pilger rollings unit above-mentioned hollow billet is rolled, hollow billet
Feed quantity is controlled in 650rpm, wind pressure in 6bar in 50mm, roll rotational speed control, and obtaining specification isHollow forging.
Hot size：By the hollow forging after de- stick after step-by-step movement reheating furnace is heated to 950 DEG C, pass through the high pressure water of 25MPa
Dephosphorization apparatus, 3 framves mutually abut and the three-roll sizing mill frame of tandem on carry out Sizing Process, obtained specification is
Pipe.
(3) it is heat-treated
Specification steel pipe is heated to 940 ± 10 DEG C, and soaking time 270min, then comes out of the stove fast using water quenching
Speed is cooled to room temperature, and cooling time is 180 seconds to steel pipe in water；Then at 660 ± 10 DEG C after tempering insulation time 400min
It is air-cooled to room temperature, obtains the seamless steel pipe of embodiment 3.
The size of arbitrary 10 seamless steel pipes of embodiment 3 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 arbitrary two seamless steel pipes of embodiment 3 are stretched
Experiment and impact test, test result are shown in Table 12.
Table 11
Table 12
The dimensional accuracy of product is fully able to meet within standard claimed range it can be seen from the data in table 11
The requirement of 100ksi grade of steel low temperature seamless steel pipes；The surrender of the steel pipe of embodiment 3 is strong it can be seen from the data in table 12
Degree, tensile strength, elongation, the customer requirement of low-temperature impact work and 100ksi grade of steels are almost suitable or even higher, especially
Low-temperature impact work is far superior to customer requirement, therefore, the tensile property of the seamless steel pipe obtained using the manufacturing method of the application,
Impact flexibility and dimensional accuracy are very excellent, can be suitable for the special of the high-strength structure steel pipe of polar region and marine environment
It is required that.
Comparative example 1
The ratio that molten iron and 500kg/t are added according to the ratio of 500kg/t adds high-quality steel scrap, as raw material, by 45
Ton electric furnace smelting, the refining of 45 tons of refining furnaces, and be added in smelting process 2.1kg/t ferrosilicon, 23kg/t low-carbon ferromanganeses,
1.3kg/t vanadium iron, 17.5kg/t chromic carbide irons, 11kg/t molybdenum-irons and a small amount of aluminium wire and ferrotianium, above-mentioned raw materials are true using 45 tons
Sky degassing furnace technology carries out the vacuum metling of molten steel；Then round billet circular-arc type continuous casting machine is used to carry out continuous casting；In above process, it controls
Refining furnace ladle bull ladle liquid steel temperature processed=± 10 DEG C of liquidus temperature+(60~80)；Baking of tundish 4.5 hours, baking temperature
1100 DEG C of degree or more；Casting speed is controlled in 0.750m/min；The vibration frequency adjusting range 215opm of crystallizer, amplitude adjustment
Range ± 2~4mm, offset adjusting range 10~30%；Crystallizer cooling water inflow controls：4800L/min.Blank is cut into scale
Afterwards, slow cooling is carried out.The content of each chemical composition in blank is detected, testing result is shown in Table 13.
Table 13
| Element | C | Si | Mn | P | S | Cr | Mo | Ni | Al |
| Content (wt%) | 0.18 | 0.25 | 1.38 | 0.007 | 0.002 | 1.10 | 0.55 | 1.02 | 0.032 |
(2) Steel Tube Rolling
The heating of blank：UsingBlank produces, and blank is carried out in annular furnace according to the heating cycle of table 14
Heating.
Table 14
Cone-type piercer：It preparesWhen seamless steel pipe, cone-type piercer, base are carried out at being 1195 DEG C in piercing temperature
Expect that diameter total reduction is 15%, roll spacing 450mm, roll feed angle is 6 °, and roll roll off angle is 5 °, and obtaining dimensions isHollow billet.
Rolling：Use pass forPilger Pilger rollings unit above-mentioned hollow billet is rolled, hollow billet
Feed quantity is controlled in 650rpm, wind pressure in 6bar in 50mm, roll rotational speed control, and obtaining specification isHollow forging.
Hot size：By the hollow forging after de- stick after step-by-step movement reheating furnace is heated to 950 DEG C, pass through the high pressure water of 25MPa
Dephosphorization apparatus, 3 framves mutually abut and the three-roll sizing mill frame of tandem on carry out Sizing Process, obtained specification is
Pipe.
(3) it is heat-treated
Specification steel pipe is heated to 940 ± 10 DEG C, and soaking time 270min, then comes out of the stove fast using water quenching
Speed is cooled to room temperature, and cooling time is 180 seconds to steel pipe in water；Then at 660 ± 10 DEG C after tempering insulation time 400min
It is air-cooled to room temperature, obtains the seamless steel pipe of comparative example 1.
The size of arbitrary 10 seamless steel pipes of comparative example 1 is measured, measurement result is shown in Table 15；According to《Steel product
The standard method and definition of mechanical property test》Specified in method arbitrary two seamless steel pipes of comparative example 1 are stretched
Experiment and impact test, test result are shown in Table 16.
Table 15
Table 16
The dimensional accuracy of product disclosure satisfy that within standard claimed range it can be seen from the data in table 15
The requirement of 100ksi grade of steel low temperature seamless steel pipes；The surrender of the steel pipe of comparative example 1 is strong it can be seen from the data in table 16
Degree, tensile strength, elongation, low-temperature impact work have just reached the customer requirement of 100ksi grade of steels, surplus capacity wretched insufficiency, especially
It is low-temperature impact work well below embodiment 1, embodiment 2 and embodiment 3, is not applied for the high intensity of polar region and marine environment
The particular/special requirement of structural steel pipe.
Comparative example 2
The ratio that molten iron and 500kg/t are added according to the ratio of 500kg/t adds high-quality steel scrap, as raw material, by 45
Ton electric furnace smelting, the refining of 45 tons of refining furnaces, and be added in smelting process 2.2kg/t ferrosilicon, 23kg/t low-carbon ferromanganeses,
Above-mentioned raw materials are used 45 tons by 1.4kg/t vanadium iron, 17.2kg/t chromic carbide irons, 10.5kg/t molybdenum-irons and a small amount of aluminium wire and ferrotianium
Vacuum outgas furnace technology carries out the vacuum metling of molten steel；Then round billet circular-arc type continuous casting machine is used to carry out continuous casting；In above process,
Control refining furnace ladle bull ladle liquid steel temperature=± 10 DEG C of liquidus temperature+(60~80)；Baking of tundish 4.5 hours, baking
1100 DEG C of temperature or more；Casting speed is controlled in 0.750m/min；The vibration frequency adjusting range 215opm of crystallizer, amplitude tune
Whole range ± 2~4mm, offset adjusting range 10~30%；Crystallizer cooling water inflow controls：4800L/min.It is fixed that blank is cut
After ruler, slow cooling is carried out.The content of each chemical composition in blank is detected, testing result is shown in Table 17.
Table 17
(2) Steel Tube Rolling
The heating of blank：UsingBlank produces, and blank is carried out in annular furnace according to the heating cycle of table 18
Heating.
Table 18
Cone-type piercer：It preparesWhen seamless steel pipe, cone-type piercer, base are carried out at being 1195 DEG C in piercing temperature
Expect that diameter total reduction is 15%, roll spacing 450mm, roll feed angle is 6 °, and roll roll off angle is 5 °, and obtaining dimensions isHollow billet.
Rolling：Use pass forPilger Pilger rollings unit above-mentioned hollow billet is rolled, hollow billet
Feed quantity is controlled in 650rpm, wind pressure in 6bar in 50mm, roll rotational speed control, and obtaining specification isHollow forging.
Hot size：By the hollow forging after de- stick after step-by-step movement reheating furnace is heated to 950 DEG C, pass through the high pressure water of 25MPa
Dephosphorization apparatus, 3 framves mutually abut and the three-roll sizing mill frame of tandem on carry out Sizing Process, obtained specification is
Pipe.
(3) it is heat-treated
Specification steel pipe is heated to 940 ± 10 DEG C, and soaking time 270min, then comes out of the stove fast using water quenching
Speed is cooled to room temperature, and cooling time is 180 seconds to steel pipe in water；Then at 660 ± 10 DEG C after tempering insulation time 400min
It is air-cooled to room temperature, obtains the seamless steel pipe of comparative example 2.
The size of arbitrary 10 seamless steel pipes of comparative example 2 is measured, measurement result is shown in Table 19；According to《Steel product
The standard method and definition of mechanical property test》Specified in method arbitrary two seamless steel pipes of comparative example 2 are stretched
Experiment and impact test, test result are shown in Table 20.
Table 19
Table 20
The dimensional accuracy of product disclosure satisfy that within standard claimed range it can be seen from the data in table 19
The requirement of 100ksi grade of steel low temperature seamless steel pipes；The surrender of the steel pipe of comparative example 2 is strong it can be seen from the data in table 20
Degree, tensile strength, elongation, low-temperature impact work have just reached the customer requirement of 100ksi grade of steels, surplus capacity wretched insufficiency, especially
It is low-temperature impact work well below embodiment 1, embodiment 2 and embodiment 3, is not applied for the high intensity of polar region and marine environment
The particular/special requirement of structural steel pipe.
It can be seen from the above description that the above embodiments of the present invention realize following technique effect：
The outside diameter tolerance of above-mentioned medium caliber thick-walled seamless steel pipes is ± 1.6mm, and wall thickness deviation is ± 3.0mm, yield strength
In 720MPa or more, tensile strength in 800MPa or more, -60 DEG C of Charpy V-types longitudinally full-scale ballistic work in 150J or more.
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, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of medium caliber heavy wall low temperature seamless steel pipe, which is characterized in that the medium caliber heavy wall low temperature seamless steel pipe
The weight percent of chemical constituent be C 0.12~0.20%, Si 0.10~0.40%, Mn 1.00~1.50%, P≤
0.015%, S≤0.003%, Cr 0.90~1.30%, Mo 0.40~0.80%, Ni 1.10~1.70%, Al 0.01~
0.05%, surplus is iron Fe and inevitable impurity；
Preferably, the weight percent of the chemical constituent of the medium caliber heavy wall low temperature seamless steel pipe be C 0.15~
0.18%, Si 0.20~0.25%, Mn 1.30~1.40%, P≤0.015%, S≤0.003%, Cr 1.00~1.15%,
Mo 0.50~0.55%, Ni 1.40~1.50%, Al 0.025~0.035%, surplus are iron Fe and inevitable impurity.
2. a kind of manufacturing method of medium caliber heavy wall low temperature seamless steel pipe as described in claim 1, which is characterized in that including
Following steps：
Step S1 carries out dispensing according to the chemical constituent of the low temperature of medium caliber heavy wall described in claim 1 seamless steel pipe, obtains
Raw material, and the raw material is smelted to obtain blank；
Step S2 carries out hot rolling to the blank and obtains pipe；And
Step S3 carries out press quenching to the pipe and tempering heat treatment obtains the medium caliber heavy wall low temperature seamless steel
Pipe.
3. manufacturing method according to claim 2, which is characterized in that the dispensing of raw material includes iron described in the step S1
It is a variety of in water, steel scrap, ferroalloy and aluminium.
4. manufacturing method according to claim 2, which is characterized in that after obtaining the raw material in the step S1, specifically
Including：The raw material is obtained into the blank by electric furnace smelting, external refining, vacuum outgas and arc continuous casting.
5. manufacturing method according to claim 4, which is characterized in that during carrying out the arc continuous casting, throwing speed
Degree control is in 0.5~0.8m/min；The vibration frequency of crystallizer is 180~230opm, and amplitude is ± 2~4mm, offset adjustment
Ranging from 10~30%.
6. manufacturing method according to claim 2, which is characterized in that the step S2 includes：
Step S21 by the blank heating to 1250~1280 DEG C, and keeps the temperature 420~450min, obtains hot base；
The hot base at 1150~1200 DEG C is carried out cone-type piercer, obtains hollow billet by step S22；
The hollow billet is carried out tube rolling using pipe mill, obtains hollow forging by step S23；And
Step S24 carries out sizing to the hollow forging and obtains the pipe.
7. manufacturing method according to claim 6, which is characterized in that the step S21 is specifically included：
The blank is passed through to preheating section heating, I section of heating of heating, II section of heating of heating, III section of heating of heating, heating IV successively
The total processing time of Duan Jiare and soaking zone, the step S21 is greater than or equal to 420min, wherein passes through the preheating section
The temperature of the blank reaches 940~1000 DEG C after heating, and the temperature of the blank reaches after I section of heating of the heating
1120~1160 DEG C, the temperature of the blank reaches 1160~1200 DEG C after II section of heating of the heating, adds by described
The temperature of the blank reaches 1200~1240 DEG C after III section of heating of heat, the temperature of the blank after IV section of heating of the heating
Degree reaches 1240~1280 DEG C, then after 120~150min of soaking zone soaking of 1250~1270 DEG C of temperature, obtains the heat
Base.
8. manufacturing method according to claim 6, which is characterized in that the pipe mill in the step S23 is Φ
720Pilger Pilger rolling units, the feed quantity of the hollow billet is 20~80mm during tube rolling, and the rotating speed of roll is 530
Between~755rpm, wind pressure is between 5.5~6.5bar.
9. manufacturing method according to claim 6, which is characterized in that the step S3 includes：
Step S31 is fast in sink after 240~270min of heat preservation to pipe progress press quenching at 930~950 DEG C
Quickly cooling is but；And
Step S32 is tempered pipe after cooling at 650~670 DEG C, and tempering time keeps the temperature sky after 360~400min
It is cold to obtain the seamless steel pipe.
10. a kind of medium caliber heavy wall low temperature as described in claim 1 is answered with seamless steel pipe in polar region and/or marine environment
With.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810155681.7A CN108531828A (en) | 2018-02-23 | 2018-02-23 | Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810155681.7A CN108531828A (en) | 2018-02-23 | 2018-02-23 | Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108531828A true CN108531828A (en) | 2018-09-14 |
Family
ID=63485814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810155681.7A Pending CN108531828A (en) | 2018-02-23 | 2018-02-23 | Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108531828A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110408862A (en) * | 2019-08-19 | 2019-11-05 | 衡阳华菱钢管有限公司 | Seamless steel pipe, manufacturing method and its application |
| CN111440998A (en) * | 2020-04-30 | 2020-07-24 | 鞍钢股份有限公司 | Seawater corrosion resistant seamless steel pipe and manufacturing method thereof |
| CN114686669A (en) * | 2020-12-31 | 2022-07-01 | 扬州龙川钢管有限公司 | Online heat treatment method for low-temperature pipe and high-steel-grade pipeline pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1361306A (en) * | 2000-12-29 | 2002-07-31 | 天津钢管公司 | Petroleum casing resisting stress corrosion of H2S and its production process |
| CN101200790A (en) * | 2006-12-12 | 2008-06-18 | 辽阳石化机械设计制造有限公司 | Oil-gas transportation large-scale high-pressure pipe fittings steel as well as pipes, pipe fittings and welding materials produced thereby |
| CN102747300A (en) * | 2012-06-27 | 2012-10-24 | 攀钢集团成都钢钒有限公司 | Seamless steel pipe for high-strength and high-toughness structure and manufacturing method thereof |
| CN103320711A (en) * | 2013-06-26 | 2013-09-25 | 衡阳华菱钢管有限公司 | Seamless steel tube and manufacturing method thereof |
| CN107385355A (en) * | 2017-06-20 | 2017-11-24 | 衡阳华菱钢管有限公司 | Seamless steel pipe, its manufacture method and heavy oil thermal recovery casing pipe |
-
2018
- 2018-02-23 CN CN201810155681.7A patent/CN108531828A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1361306A (en) * | 2000-12-29 | 2002-07-31 | 天津钢管公司 | Petroleum casing resisting stress corrosion of H2S and its production process |
| CN101200790A (en) * | 2006-12-12 | 2008-06-18 | 辽阳石化机械设计制造有限公司 | Oil-gas transportation large-scale high-pressure pipe fittings steel as well as pipes, pipe fittings and welding materials produced thereby |
| CN102747300A (en) * | 2012-06-27 | 2012-10-24 | 攀钢集团成都钢钒有限公司 | Seamless steel pipe for high-strength and high-toughness structure and manufacturing method thereof |
| CN103320711A (en) * | 2013-06-26 | 2013-09-25 | 衡阳华菱钢管有限公司 | Seamless steel tube and manufacturing method thereof |
| CN107385355A (en) * | 2017-06-20 | 2017-11-24 | 衡阳华菱钢管有限公司 | Seamless steel pipe, its manufacture method and heavy oil thermal recovery casing pipe |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110408862A (en) * | 2019-08-19 | 2019-11-05 | 衡阳华菱钢管有限公司 | Seamless steel pipe, manufacturing method and its application |
| CN111440998A (en) * | 2020-04-30 | 2020-07-24 | 鞍钢股份有限公司 | Seawater corrosion resistant seamless steel pipe and manufacturing method thereof |
| CN114686669A (en) * | 2020-12-31 | 2022-07-01 | 扬州龙川钢管有限公司 | Online heat treatment method for low-temperature pipe and high-steel-grade pipeline pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103320711B (en) | Weldless steel tube and manufacture method thereof | |
| EP3795710A1 (en) | Hot-rolled thick h-beam with yield strength grade of 500 mpa and preparation method therefor | |
| CN111286670B (en) | Medium-carbon non-quenched and tempered steel and preparation process thereof, and connecting rod and preparation process thereof | |
| CN102699628B (en) | Diameter is the production method of the pipeline with hydrogen sulfide corrosion resistance seamless steel pipe of 508mm | |
| CN105586532B (en) | Low-alloy high-strength heavy caliber thick wall seamless steel tube and its manufacture method | |
| CN107502817A (en) | High grain size number pinion steel 20CrMnTiH and its production technology | |
| CN105525209B (en) | A kind of low yield strength ratio Q460GJ steel plate for building and its production method | |
| CN106191656A (en) | A kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application | |
| CN108251747B (en) | Steel pipe for crane boom and manufacturing method thereof | |
| CN107937807A (en) | 770MPa grades of low-welding crack-sensitive pressure vessel steels and its manufacture method | |
| CN108660377A (en) | The preparation method of seamless steel pipe and seamless steel pipe | |
| CN107385355A (en) | Seamless steel pipe, its manufacture method and heavy oil thermal recovery casing pipe | |
| CN110551878A (en) | Ultrahigh-strength ultrahigh-toughness low-density dual-phase layered steel plate and preparation method thereof | |
| CN108531828A (en) | Medium caliber heavy wall low temperature seamless steel pipe, its manufacturing method and application | |
| CN105603310B (en) | A kind of low yield strength ratio Q420GJ steel plate for building and its production method | |
| CN111118257A (en) | Heat treatment method for improving impact toughness of boron-containing thick hydroelectric steel plate core | |
| CN113930671A (en) | Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof | |
| CN108220781A (en) | Seamless steel pipe, its raw material, its production method and perforating gun | |
| CN104962837A (en) | Steel plate for 600 MPa grade hydropower pressure steel tube with low crack sensitivity and production method of steel plate | |
| CN111996462A (en) | Longitudinal variable-thickness ultrahigh-strength ship board and production method thereof | |
| CN112410679A (en) | Chromium alloy non-quenched and tempered steel wire rod and production method thereof | |
| CN111826580A (en) | High-strength easy-to-weld steel plate for ultra-thick large hydropower station and production method thereof | |
| CN112981238B (en) | Standard Q460D steel plate for forge piece production by continuous casting billet and manufacturing method thereof | |
| CN115491576A (en) | Smelting continuous casting method of rare earth microalloyed 355 MPa-level low-cost hot-rolled H-shaped steel | |
| CN103225042B (en) | A kind of production method of easy-formation high-strength medium plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180914 |