CN107385349A - Possess high-intensity high-tenacity and the seamless steel pipe and preparation method of anti-SSC performances - Google Patents
Possess high-intensity high-tenacity and the seamless steel pipe and preparation method of anti-SSC performances Download PDFInfo
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- CN107385349A CN107385349A CN201710472639.3A CN201710472639A CN107385349A CN 107385349 A CN107385349 A CN 107385349A CN 201710472639 A CN201710472639 A CN 201710472639A CN 107385349 A CN107385349 A CN 107385349A
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- 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
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
Abstract
The invention provides a kind of seamless steel pipe and preparation method for possessing high-intensity high-tenacity and anti-SSC performances.For its gross weight, seamless steel pipe includes 0.15~0.30% C element, 0.15~0.60% Si elements, 0.40~1.0% Mn elements, 0.60~1.5% Cr elements, 0.80~1.50% Mo elements, 0.035~0.085% Nb elements, 0.008~0.035% Al elements, 0~0.012% P element, 0~0.003% S elements, 0~0.0020% O elements, 0~0.0050% N element and the Fe elements of 0~0.0002% H element and surplus.By the limited proportion of above-mentioned each element within the above range, be advantageous to play the synergy between each element so that obtained seamless steel pipe has excellent intensity, toughness and anti-SSC concurrently.
Description
Technical field
The present invention relates to steel pipe manufacturing field, possess high-intensity high-tenacity and anti-SSC performances in particular to a kind of
Seamless steel pipe and preparation method.
Background technology
Hydrogen sulfide gas is sour gas common in petroleum resources recovery process.About 1/3 contains in world's Oil/gas Well
Hydrogen sulfide gas.The many oil fields in China such as Sichuan, long celebrating, North China, Xinjiang, Jiang-Han Area oil field oil-gas Layer in all contain hydrogen sulfide
Gas.In recent years, as the low shallow well of corrosivity is constantly exhausted, the high high pressure and deep well exploitation quantity of corrosivity is being continuously increased, right
Tubing and casing used in oil well and gas well proposes harsher military service performance requirement.
Common tubing and casing is used to contain H2During S petroleum resources exploitation, tubing and casing is using stress and H2In the presence of S gases,
Brittle failure just often occurs suddenly when stress is far below the yield strength of itself, and (this phenomenon is referred to as sulphide stress corrosion
Cracking, abbreviation SSC), so as to cause scrapping for tubing and casing or whole mouth well.
Deep-well/ultradeep well and more complicated and harsh service condition propose higher want to oil well seamless steel pipe
Ask：Oil well seamless steel pipe should have very high intensity and anti-cracking performance, to bear the severe work such as underground HTHP
Condition condition, while also there is certain anti-H 2 S stress corrosion performance.
General tube material has a certain degree of weakening with the raising of intensity, impact flexibility and anti-SSC performances.With
More than 125ksi, in particular up to 140/150ksi, the index of the toughness of steel and anti-SSC performances is often more difficult to yield strength
Reach.The resistance to SSC performances of oil well seamless steel pipe are depended primarily in the chemical composition, microstructure and steel of steel with impact flexibility
Quantity, size and distribution of field trash etc..Therefore, the exploitation of ultradeep well superhigh intensity anti-H 2 S stress corrosion sleeve pipe
Difficulty is larger, global technical barrier of being known as.
The content of the invention
It is a primary object of the present invention to provide a kind of seamless steel pipe and system for possessing high-intensity high-tenacity and anti-SSC performances
Preparation Method, to solve the problems, such as that existing seamless steel pipe can not have high intensity, high tenacity and excellent anti-SSC concurrently.
To achieve these goals, one aspect of the invention provides a kind of seamless steel pipe, relative to the total of seamless steel pipe
For weight, seamless steel pipe includes 0.15~0.30% C element, 0.15~0.60% Si elements, 0.40~1.0% Mn
Element, 0.60~1.5% Cr elements, 0.80~1.50% Mo elements, 0.035~0.085% Nb elements, 0.008~
0.035% Al elements, 0~0.012% P element, 0~0.003% S elements, 0~0.0020% O elements, 0~
The Fe elements of 0.0050% N element and 0~0.0002% H element and surplus.
Further, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.30~0.45% Si elements.
Further, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.025~0.035% Al members
Element.
Further, the weight ratio of Si elements and Al elements is 25~34:2.
Further, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.70~0.85% Mn elements.
Further, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.95~1.15% Cr elements.
Further, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.85~0.98% Mo elements.
Further, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.050~0.085% Nb members
Element.
Further, Cr elements, the gross weight of Mo elements and Nb elements and C element gross weight and the ratio between be 15~17:
2。
To achieve these goals, another aspect of the invention provides a kind of preparation method of seamless steel pipe, preparation side
Method includes：According to the ratio preparation raw material of above-mentioned seamless steel pipe；Raw material is refined and blank is made in casting；And by blank
After carrying out rolling process and heat treatment, seamless steel pipe is obtained.
Further, the step of rolling process includes：Blank is heated, obtains hot base；Hot base is entered into eleven punch 11, obtained
To hollow billet；And rolled hollow billet, obtain hollow forging；Wherein, heating process includes：Preheating section：Blank is risen with furnace temperature
Temperature, reach preheating temperature；Warming-up section：Blank is warming up to one section of temperature of heating by preheating temperature, it is 1014 to heat one section of temperature
~1034 DEG C, the heat time is more than or equal to 30min；Blank is warming up to two sections of temperature of heating, heating two by heating one section of temperature
Duan Wendu is 1128~1148, and the heat time is more than or equal to 40min DEG C；Blank is warming up to three sections of heating by heating two sections of temperature
Temperature, it is 1238~1258 DEG C to heat three sections of temperature, and the heat time is more than or equal to 20min；By blank by heating three sections of temperature liters
Temperature is to four sections of temperature are heated, and it is 1257~1277 DEG C to heat four sections of temperature, and the heat time is more than or equal to 20min；By blank by adding
Hot four sections of temperature are warming up to five sections of temperature of heating, and it is 1243~1263 DEG C to heat five sections of temperature, and the heat time is more than or equal to
20min；And soaking zone, five sections of temperature will be heated and be warming up to soaking temperature, soaking temperature is 1240~1260 DEG C, the heat time
More than or equal to 40min.
Further, hollow billet is rolled using MPM MPM tube rolling mills.
Further, preparation method also includes straightening step after the heat treatment, and the temperature of straightening step is 500~530
℃。
Applying the technical scheme of the present invention, Si elements are not only effective deoxidant element in steel in above-mentioned seamless steel pipe,
Delta ferrite crystallization can also be suppressed；Al elements are also excellent deoxidant element, while Al members are added while Si elements are added
Element, be advantageous to improve deoxidation effect by the synergy of two kinds of elements, and oxidation highly in small, broken bits, submicroscopic can be generated
Thing, effectively suppress crystal grain in steel heating process and grow up, so as to play a part of crystal grain thinning, improve toughness.Mn elements are Austria
The formation element of family name's body, it can improve the intensity of seamless steel pipe, and and can improves the quenching degree of steel pipe and reduces hardening heat, together
When there is deoxidation and desulfurization effect, the harmful effect of sulphur can be weakened, and then improve the anti-SCC energy of seamless steel pipe.Cr elements, Mo
Element, Nb elements can form carbide, Al elements, Nb elements and N element with C element and form nitride, and this is advantageous to improve
The intensity and toughness of seamless steel pipe, while Cr can form one layer of CrO passivating film in corrosion or oxidizing process, can effectively improve steel
The inoxidizability and corrosion resistance of pipe.In addition, be advantageous to play each member by the limited proportion of above-mentioned each element within the above range
Synergy between element, and then cause obtained seamless steel pipe that there is excellent intensity, toughness and anti-SSC simultaneously.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.The present invention is described in detail below in conjunction with embodiment.
As described by background technology, existing seamless steel pipe presence can not have high intensity, high tenacity and excellent concurrently
The problem of anti-SSC.In order to solve the above-mentioned technical problem, the invention provides a kind of seamless steel pipe, relative to seamless steel pipe
For gross weight, above-mentioned seamless steel pipe include 0.15~0.30% C element, 0.15~0.60% Si elements, 0.40~
1.0% Mn elements, 0.60~1.5% Cr elements, 0.80~1.50% Mo elements, 0.035~0.085% Nb members
Element, 0.008~0.035% Al elements, 0~0.012% P element, 0~0.003% S elements, 0~0.0020% O
Element, 0~0.0050% N element, the Fe elements of 0~0.0002% H element and surplus.
In above-mentioned seamless steel pipe, Si elements are not only effective deoxidant element in steel, additionally it is possible to suppress delta ferrite knot
It is brilliant；Al elements are also excellent deoxidant element, while Al elements are added while Si elements are added, and are advantageous to by two kinds of members
The synergy of element improves deoxidation effect, and can generate oxide highly in small, broken bits, submicroscopic, and it is heated effectively to suppress steel
Crystal grain is grown up in journey, so as to play a part of crystal grain thinning, improve toughness.Mn elements are the formation element of austenite, and it was both
The intensity of seamless steel pipe can be improved, and can improves the quenching degree of steel pipe and reduces hardening heat, while has deoxidation and desulfurization work(
Effect, the harmful effect of sulphur can be weakened, and then improve the anti-SCC energy of seamless steel pipe.Cr elements, Mo elements, Nb elements can be with C
Element forms carbide, Al elements, Nb elements and N element form nitride, and this is advantageous to the intensity of raising seamless steel pipe and tough
Property, while Cr can form one layer of CrO passivating film in corrosion or oxidizing process, can effectively improve the inoxidizability of steel pipe and anti-corruption
Corrosion.In addition, be advantageous to play the synergy between each element, enter by the limited proportion of above-mentioned each element within the above range
And cause obtained seamless steel pipe that there is excellent intensity, toughness and anti-SSC simultaneously.
In above-mentioned seamless steel pipe, Si elements can remove the oxygen element in raw material, improve the anti-SSC performances of seamless steel pipe, together
When can also improve the toughness of seamless steel pipe.In a preferred embodiment, for the gross weight of seamless steel pipe, nothing
Seam steel pipe includes 0.30~0.45% Si elements.The dosage of Si elements includes but is not limited to above range, and is limited to
Be advantageous to further improve anti-the SSC performances and toughness of seamless steel pipe in above range.
In above-mentioned seamless steel pipe, Al elements can not only coordinate the oxygen in removing raw material with Si elements, additionally it is possible to which generation is high
Crystal grain is grown up when spending in small, broken bits, submicroscopic oxide, and can effectively suppress steel heating, and then crystal grain thinning.In one kind
In preferred embodiment, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.025~0.035% Al members
Element.The dosage of Al elements includes but is not limited to above range, and is limited and be advantageous to make seamless steel pipe within the above range
Crystal grain more refines, so as to further improve its toughness.
It is big by the mating reaction of Si elements and Al elements, the anti-SSC and toughness of seamless steel pipe in above-mentioned seamless steel pipe
Width is lifted.In a preferred embodiment, the weight ratio of Si elements and Al elements is 25~34:2.Si elements and Al elements
Weight than including but not limited to above range, and is limited and is advantageous to further raising seamless steel pipe within the above range
Combination property.
In above-mentioned seamless steel pipe, the addition of Mn elements can not only improve the intensity of seamless steel pipe, and and can improves steel pipe
Quenching degree and reduction hardening heat, additionally it is possible to improve its anti-SSC performance.In a preferred embodiment, relative to seamless
For the gross weight of steel pipe, seamless steel pipe includes 0.70~0.85% Mn elements.On the dosage of Mn elements includes but is not limited to
Scope is stated, and further restriction is advantageous to further improve the intensity of seamless steel pipe and anti-SSC performances within the above range by it.
In a preferred embodiment, for the gross weight of seamless steel pipe, seamless steel pipe include 0.95~
1.15% Cr elements.In above-mentioned seamless steel pipe, Cr elements can form carbide with C element, and the dosage of Cr elements is limited
Be advantageous to further improve the intensity and quenching degree of seamless steel pipe within the above range, degree of grain refinement and tempering are stable
Property.
In a preferred embodiment, for the gross weight of seamless steel pipe, seamless steel pipe include 0.85~
0.98% Mo elements.In above-mentioned seamless steel pipe, Mo elements can form carbide with C element, and the dosage of Mo elements is limited
Be advantageous to further improve the intensity and quenching degree of seamless steel pipe within the above range, degree of grain refinement and tempering are stable
Property.
In above-mentioned seamless steel pipe, Nb elements can form carbide with C element, improve the heat endurance of steel, while can also
Enough make blank be unlikely to grow excessively thick in heating period austenite crystal, and enter crystal grain in the subsequent operation of rolling
Step refining, improve the intensity and toughness of steel.In drawing process, separated out with highly dispersed [Nb] C, play precipitation strength
Effect, ensure that there is excellent low-temperature impact toughness while the mechanical property of material reaches more than 140ksi intensity.In one kind
In preferred embodiment, for the gross weight of seamless steel pipe, seamless steel pipe includes 0.050~0.085% Nb members
Element.And the dosage of Nb elements is limited and is advantageous to make mechanical strength excellent in seamless steel pipe and low-temperature impact within the above range
Toughness further gets a promotion.
Cr elements, Mo elements can form the comparatively fine crystal grain of crystal grain with C element to lift seamless steel with Nb elements
The toughness of pipe.In a preferred embodiment, Cr elements, Mo elements and the gross weight of Nb elements and the gross weight of C element
Frequently be 15~17:2.The gross weight and C element of Cr elements, Mo elements and Nb elements are limited and are advantageous within the above range
More further improve the combination property of seamless steel pipe.
In order to be better understood from the application, this application provides a kind of preparation method of seamless steel pipe, the preparation method bag
Include：According to the ratio preparation raw material of above-mentioned seamless steel pipe；The raw material is refined and blank is made in casting；And blank is entered
After row rolling process and heat treatment, seamless steel pipe is obtained.Have excellent mechanics strong using seamless steel pipe made from above-mentioned raw materials
Degree, toughness and anti-SSC.
For further it is economical, produce seamless steel pipe in bulk and improve the quality of blank and containing for control impurity element
Amount, it is preferable that dispensing include molten iron, tube head, pure material, high-quality steel scrap, ferroalloy and aluminium in it is a variety of and control making for steel scrap
Dosage.Preferably, raw material preparation obtained is successively after electric furnace smelting, external refining, vacuum outgas and arc continuous casting
Obtain blank.
Preferably, carry out external refining during, using whole ar blowing refining technique, and be uniformly added into batches calcium carbide,
Aluminum shot and carbon dust carry out deoxidation, end vacuum retention time >=20min.During external refining, calcification processing can make calcium
With the S in steel with reference to and generate sulfide, and improve the shape of field trash, and then be advantageous to improve the anti-SSC of seamless steel pipe
Energy.
Preferably, during carrying out arc continuous casting, casting speed control is controlled 35 in 0.8~1.0m/min, the degree of superheat
~44 DEG C.During arc continuous casting, casting speed and the degree of superheat control above range be advantageous to control steel in composition it is inclined
Analysis, so as to improve the anti-SSC performances of seamless steel pipe.
In a preferred embodiment, the step of rolling process includes：Blank is heated, obtains hot base；Will
Hot base enters eleven punch 11, obtains hollow billet；And rolled hollow billet, obtain hollow forging.
The heating-up temperature of blank is too high easily to there is the phenomenon overheated, and this can cause coarse grains in seamless steel pipe, easily production
Raw crackle, and then the mechanical strength of seamless steel pipe can be reduced；And do not reach when heating the too low performance that can cause seamless steel pipe
Required index.The heating-up temperature of blank is limited and is advantageous to further improve the seamless steel pipe subsequently obtained within the above range
The combination property such as toughness.It is preferred that above-mentioned heating process is carried out in annular furnace.
Preferably, above-mentioned heating process includes three preheating section, warming-up section and soaking zone processes；Preheating section temperature is with stove
Temperature；Warming-up section is divided into five sections：Blank is warming up to one section of temperature of heating by preheating temperature, it is 1014~1034 to heat one section of temperature
DEG C, the heat time is more than or equal to 30min；Blank is warming up to two sections of temperature of heating by heating one section of temperature, heats two sections of temperature
For 1128~1148 DEG C, the heat time is more than or equal to 40min；Blank is warming up to three sections of temperature of heating by heating two sections of temperature,
Three sections of temperature of heating are 1238~1258 DEG C, and the heat time is more than or equal to 20min；Blank is added by heating three sections of temperature and being warming up to
Hot four sections of temperature, it is 1257~1277 DEG C to heat four sections of temperature, and the heat time is more than or equal to 20min；By blank by four sections of heating
Temperature is warming up to five sections of temperature of heating, and it is 1243~1263 DEG C to heat five sections of temperature, and the heat time is more than or equal to 20min；It will add
Hot five sections of temperature are warming up to soaking temperature, and the temperature of soaking zone is 1240~1260 DEG C, and the heat time is more than or equal to 40min.It is excellent
Choosing, total heat time of heating process are more than or equal to 190min.By above-mentioned heat stepwise, pipe is set to be gradually increased to setting temperature
Degree, can be such that pipe fully heats, and heated under more gentle elevated temp, and this is advantageous to further to improve seamless
The intensity of steel pipe.
Preferably, the heating-up temperature of four sections and five sections of heating is heated more than the heating-up temperature of soaking zone, and this is advantageous to accelerate
Blank in the programming rate of bringing-up section, make blank when coming out of the stove the temperature of interior table and appearance it is uniform, ensureing the premise of firing rate
It is lower to shorten total heat time.
In the heating process of warming-up section, because the temperature of heating is usually above the actual temperature of body, thus bringing-up section
Heating-up temperature may be above the temperature of soaking zone, the purpose for the arrangement is that in order to improve the speed of body heating.And when heating
Between need to be adjusted according to the difference of body specification.
In a preferred embodiment, hollow billet is rolled using MPM MPM tube rolling mills.Using
The operation of rolling that MPM MPM tube rolling mills are carried out, can make full use of the stranding of Continuous mill train to roll property, produce hollow billet
Larger deflection, belongs to the process of regrating, and this is advantageous to crystal grain in broken steel pipe, can play crystal grain thinning, Jin Erneng
Enough improve the toughness of seamless steel pipe.
Heat treatment process in above-mentioned preparation method includes：
At 900~920 DEG C, the heating and thermal insulation before being quenched to seamless steel pipe, soaking time is cold after 50~80min
But；And at 673~693 DEG C, the steel pipe after above-mentioned cooling is tempered, air cools down to obtain after being incubated 80~120min
High-intensity high-tenacity anti-H 2 S stress corrosion oil well seamless steel pipe.
50~80min is incubated at 900~920 DEG C can make each alloying element sufficiently and uniformly be dissolved in austenite crystal
In grain, this is advantageous to the uniformity for improving austenitizing；Then it can ensure that austenite arrives using inside and outside water injection system during cooling
The adequacy and uniformity of martensite transfor mation；Then at 673~693 DEG C tempering insulation 80~120min, make alloying element from
In supersaturated solid solution uniformly, separate out to disperse, and the stability of tempered structure is ensured.
In a preferred embodiment, above-mentioned preparation method also includes straightening step, and the temperature of straightening step is 500
~530 DEG C.Straightening temperature after tempering within the above range, advantageously reduces caused residual stress in straightening process, simultaneously
Also advantageously improve the anti-SSC performances of material.
The present invention is described in further detail below in conjunction with specific embodiment, these embodiments are it is not intended that limit this
Invent scope claimed.
In the application seamless steel pipe made from embodiment 1 to 16 element composition and comparative example 1 to 7 in mechanical strength be
The elemental composition of 140ksi seamless steel pipe, is shown in Table 1.
Embodiment 1 to 13 and comparative example 1 to 7 are made by the following method：
1st, the chemical composition proportion material as needed for embodiment, chemical constituent composition is shown in Table 1 in each embodiment；
2nd, above-mentioned raw materials are refined and blank is made in manufacture.
3rd, above-mentioned blank is obtained into required seamless steel pipe after rolling process, heat treatment and straightening processing,
Specifically include：
Preheating section：Blank is preheated to 1014 DEG C in annular furnace；
Warming-up section：Blank is warming up to one section of temperature of heating by preheating temperature, it is 1024 DEG C to heat one section of temperature, the heat time
For 30min；Blank is warming up to two sections of temperature of heating by heating one section of temperature, it is 1138 to heat two sections of temperature, heat time 40min
℃；Blank is warming up to three sections of temperature of heating by heating two sections of temperature, it is 1248 DEG C to heat three sections of temperature, heat time 20min；Will
Blank is warming up to four sections of temperature of heating by heating three sections of temperature, and it is 1253 DEG C to heat four sections of temperature, heat time 25min；By blank
Five sections of temperature of heating are warming up to by heating four sections of temperature, it is 1260 DEG C to heat five sections of temperature, heat time 30min；
Soaking zone：The seamless steel pipe progress soaking that will heat up process obtains hot base, and the temperature of equal thermal process is 1260 DEG C.Will
Hot base obtains the hot rolling that specification is 244.48 × 11.99mm of Ф by taper extension diameter perforation and MPM retained-mandrel MPM group tube rollings
State seamless steel pipe.The seamless steel pipe of rolled is heated to 910 ± 10 DEG C, and is incubated 54min, then comes out of the stove and is sprayed using interior appearance
Water system water quenching cooling is to room temperature；Then tempering is incubated air cooling after 78min at 683 ± 10 DEG C.To steel at 500 DEG C after tempering
Pipe carries out thermal straightening, and is air-cooled to room temperature, obtains the seamless steel pipe of embodiment.Wherein, the scope that " ± " Representative errors are allowed.
Embodiment 14
Difference with embodiment 1 is that the soaking temperature of blank is 1200 DEG C.
Embodiment 15
Difference with embodiment 1 is that straightening temperature is 450 DEG C.
Embodiment 16
Difference with embodiment 1 is, the heating process of blank is not preheated and rank to be directly heated to 1260 DEG C
Section temperature-rise period.
Table 1
To the performance test of seamless steel pipe in seamless steel pipe made from the embodiment of the present application 1 to 16 and comparative example 1 to 7
Method is as follows：
Yield strength：Refer to ASTM A370-15.
Tensile strength：Refer to ASTM A370-15.
Elongation percentage：Refer to ASTM A370-15.
Impact flexibility (A kV/J)：Refer to ASTM A370-15.
Hydrogen sulfide corrosion resistance energy (anti-SSC performances)：Refer to NACE TM0177 or ISO7539-2:1989 standards,
Four-point bending method in ISO15156-3.
The performance test results of seamless steel pipe in seamless steel pipe made from the embodiment of the present application 1 to 16 and comparative example 1 to 7
It is shown in Table 2.
Table 2
Comparing embodiment 1,5 and comparative example 2 understand, Si dosage is limited in the range of the application protects, favorably
In combination properties such as yield strength, tensile strength, elongation percentage, toughness and the shock resistances for improving seamless steel pipe.
Comparing embodiment 1,6 and comparative example 3 understood, the dosage of Mn elements is limited into the preferred scope that the application protected
It is interior, be advantageous to improve the combination properties such as elongation percentage, toughness, shock resistance and the anti-SSC of seamless steel pipe.
Comparing embodiment 1,7 and comparative example 4 are understood, the dosage of Cr elements is further limited to the protection of the application respectively
In the range of, be advantageous to improve the combination properties such as elongation percentage, toughness and the shock resistance of seamless steel pipe and anti-SSC.
Comparing embodiment 1,8 and comparative example 1 and 5 are understood, the dosage of Mo elements is limited in the protection domain of the application,
Be advantageous to improve the combination properties such as elongation percentage, toughness and the shock resistance of seamless steel pipe and anti-SSC.
Comparing embodiment 1,9 and comparative example 6 are understood, the dosage of Nb elements is limited in the protection domain of the application, had
Beneficial to the toughness and the combination property such as shock resistance and anti-SSC for improving seamless steel pipe.
Comparing embodiment 5,10 and comparative example 7 are understood, the dosage of Al elements is limited in the protection domain of the application, had
It is comprehensive beneficial to yield strength, tensile strength, elongation percentage, toughness and the shock resistance and anti-SSC for improving seamless steel pipe etc.
Performance.
Comparing embodiment 10 and 11 understands that the weight ratio of Si elements and Al elements is limited into the application preferably protects model
In enclosing, be advantageous to improve the elongation percentage of seamless steel pipe, impact strength and reduce seamless steel pipe ductile-brittle transition temperature, that is, improve nothing
Stitch the toughness of steel pipe.
Knowable to comparing embodiment 1 to 4 and 12, the dosage of each metallic element in seamless steel pipe is further limited to the application
In preferable scope, be advantageous to further improve the combination property of seamless steel pipe.
Comparing embodiment 12 and 13 is understood, by Cr elements, Mo elements with the gross weight of Nb elements and the weight of C element than limiting
It is scheduled in the preferable scope that the application is protected, is advantageous to further improve tensile strength and impact strength.
Comparing embodiment 1,14 to 16, it is known that the preparation condition of seamless steel pipe, which is limited in the preferable scope of the application, to be had
Beneficial to the combination property for improving seamless steel pipe.
As can be seen from the above description, the above embodiments of the present invention realize following technique effect：
The intensity of common Cr-Mo seamless steel pipes can reach 140ksi by increasing C content and reducing temperature
Grade of steel, but impact flexibility and anti-H 2 S stress corrosion performance are bad, can not stablize the four-point bending method sulfuration resistant by 720h
Hydrogen stress corrosion (cracking) test；And rational composition proportion, control impurity member are passed through on the basis of common Cr-Mo steel according to the present invention
The content of element and the form and content for controlling field trash, and be suitably heat-treated, SMYS can be produced
More than 140ksi and with excellent low-temperature impact toughness and under weakly acidic condition with excellent anti-H 2 S stress corrosion performance
Seamless steel pipe.By the proportion optimizing of alloying element, the steel-making of optimization and hot rolling technology, can produce economical, in bulk high
The seamless steel pipe of strength high toughness anti-H 2 S stress corrosion.The nothing of the high-intensity high-tenacity anti-H 2 S stress corrosion produced
Seam steel pipe can be widely applied to the oil-gas mining operation of deep-well/ultradeep well of sulfur-bearing, have very wide application prospect.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (13)
1. a kind of seamless steel pipe, it is characterised in that for the gross weight of the seamless steel pipe, the seamless steel pipe includes
0.15~0.30% C element, 0.15~0.60% Si elements, 0.40~1.0% Mn elements, 0.60~1.5% Cr
Element, 0.80~1.50% Mo elements, 0.035~0.085% Nb elements, 0.008~0.035% Al elements, 0~
0.012% P element, 0~0.003% S elements, 0~0.0020% O elements, 0~0.0050% N element and 0~
0.0002% H element and the Fe elements of surplus.
2. seamless steel pipe according to claim 1, it is characterised in that for the gross weight of the seamless steel pipe,
The seamless steel pipe includes 0.30~0.45% Si elements.
3. seamless steel pipe according to claim 2, it is characterised in that for the gross weight of the seamless steel pipe,
The seamless steel pipe includes 0.025~0.035% Al elements.
4. seamless steel pipe according to claim 3, it is characterised in that the weight ratio of the Si elements and the Al elements is
25~34:2.
5. seamless steel pipe according to any one of claim 1 to 4, it is characterised in that relative to the seamless steel pipe
For gross weight, the seamless steel pipe includes 0.70~0.85% Mn elements.
6. seamless steel pipe according to claim 5, it is characterised in that for the gross weight of the seamless steel pipe,
The seamless steel pipe includes 0.95~1.15% Cr elements.
7. seamless steel pipe according to claim 5, it is characterised in that for the gross weight of the seamless steel pipe,
The seamless steel pipe includes 0.85~0.98% Mo elements.
8. seamless steel pipe according to claim 5, it is characterised in that for the gross weight of the seamless steel pipe,
The seamless steel pipe includes 0.050~0.085% Nb elements.
9. seamless steel pipe according to claim 1, it is characterised in that the Cr elements, the Mo elements and Nb members
The gross weight of gross weight and the C element of element and the ratio between for 15~17:2.
10. a kind of preparation method of seamless steel pipe, the preparation method include：
According to the ratio preparation raw material of the seamless steel pipe any one of claim 1 to 9；
The raw material is refined and blank is made in casting；And
After the blank is carried out into rolling process and heat treatment, the seamless steel pipe is obtained.
11. preparation method according to claim 10, it is characterised in that include the step of the rolling process：
The blank is heated, obtains hot base；The hot base is entered into eleven punch 11, obtains hollow billet；And the hollow billet is carried out
Rolling, obtains hollow forging；
It is preferred that the heating process includes：
Preheating section：The blank is heated up with furnace temperature, reaches preheating temperature；
Warming-up section：
The blank is warming up to one section of temperature of heating by preheating temperature, described one section of temperature of heating is 1014~1034 DEG C, is added
The hot time is more than or equal to 30min；The blank is warming up to two sections of temperature of heating, the heating two by one section of temperature of the heating
Duan Wendu is 1128~1148, and the heat time is more than or equal to 40min DEG C；The blank is warming up to by two sections of temperature of the heating
Three sections of temperature are heated, described three sections of temperature of heating are 1238~1258 DEG C, and the heat time is more than or equal to 20min；By the blank
Four sections of temperature of heating are warming up to by three sections of temperature of the heating, described four sections of temperature of heating are 1257~1277 DEG C, the heat time
More than or equal to 20min；The blank is warming up to five sections of temperature of heating, five sections of temperature of the heating by four sections of temperature of the heating
For 1243~1263 DEG C, the heat time is more than or equal to 20min；And
Soaking zone, five sections of temperature of the heating are warming up to soaking temperature, the soaking temperature is 1240~1260 DEG C, during heating
Between be more than or equal to 40min.
12. preparation method according to claim 11, it is characterised in that using MPM MPM tube rolling mills to institute
Hollow billet is stated to be rolled.
13. preparation method according to claim 10, it is characterised in that the preparation method is gone back after the heat treatment
Including straightening step, the temperature of the straightening step is 500~530 DEG C.
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| CN108251747A (en) * | 2018-02-05 | 2018-07-06 | 衡阳华菱钢管有限公司 | Crane arm support steel pipe and its manufacturing method |
| CN112063922A (en) * | 2020-09-02 | 2020-12-11 | 衡阳华菱钢管有限公司 | Steel pipe, preparation method and application thereof |
| CN114855084A (en) * | 2022-04-29 | 2022-08-05 | 南京钢铁股份有限公司 | Hot-rolled round steel for 120ksi steel grade high-strength high-toughness high-grade sulfur-resistant drill pipe joint and preparation method thereof |
| CN115110010A (en) * | 2022-05-31 | 2022-09-27 | 天津钢管制造有限公司 | Seamless steel tube for 140Ksi steel grade trenchless drill rod and preparation method thereof |
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| CN112063922B (en) * | 2020-09-02 | 2022-03-11 | 衡阳华菱钢管有限公司 | Steel pipe, preparation method and application thereof |
| CN114855084A (en) * | 2022-04-29 | 2022-08-05 | 南京钢铁股份有限公司 | Hot-rolled round steel for 120ksi steel grade high-strength high-toughness high-grade sulfur-resistant drill pipe joint and preparation method thereof |
| CN115110010A (en) * | 2022-05-31 | 2022-09-27 | 天津钢管制造有限公司 | Seamless steel tube for 140Ksi steel grade trenchless drill rod and preparation method thereof |
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| CN107385349B (en) | 2019-06-21 |
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