CN109972031A - The special seamless steel pipe of ocean engineering superhigh intensity fine grain - Google Patents

The special seamless steel pipe of ocean engineering superhigh intensity fine grain Download PDF

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Publication number
CN109972031A
CN109972031A CN201811223431.9A CN201811223431A CN109972031A CN 109972031 A CN109972031 A CN 109972031A CN 201811223431 A CN201811223431 A CN 201811223431A CN 109972031 A CN109972031 A CN 109972031A
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steel pipe
seamless steel
temperature
fine grain
ocean engineering
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张政
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Jiangsu Sainz Metal New Mstar Technology Ltd
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Jiangsu Sainz Metal New Mstar Technology Ltd
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    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention relates to a kind of special seamless steel pipes of ocean engineering superhigh intensity fine grain, it includes the chemical constituent according to weight percent are as follows: C 0.08 ~ 0.11%, Si 0.35 ~ 0.45%, Mn 0.8 ~ 1.5%, P 0.015 ~ 0.025%, S 0.005 ~ 0.01%, Cu 0.25 ~ 0.4%, Al 0.012 ~ 0.035%, W 0.8 ~ 1.2%, Re 0.05 ~ 0.3%, Ni 0.06 ~ 0.1%, Cr 0.2 ~ 0.5% and surplus are Fe and impurity forms, the carbon equivalent of the application is no more than 4%, in the formula of the application, W, Re forms complex role, it may replace the V in conventional formulation, significantly improve the intensity of steel；It adds Al, Cu and Cr and forms complex role, significantly improve the freezing corrosion of steel.

Description

The special seamless steel pipe of ocean engineering superhigh intensity fine grain
Technical field
The present invention relates to the technical fields of seamless steel pipe processing, more particularly, to a kind of ocean engineering superhigh intensity fine grain The special seamless steel pipe of grain.
Background technique
Currently, application No. is 200510047196.0 Chinese patents to disclose a kind of high strength and low welding crack sensitivity Steel thick plate and its production method, the ingredient in the invention be consider to joined on the basis of C, Mn, Nb, V element a certain amount of Cu, Ni, Mo member usually guarantee performance.Application No. is 201310236531.6 Chinese patent disclose a kind of Large Diameter and Very heavy wall without Stitch steel pipe and its manufacturing method, the chemical component of the pipe are as follows: C≤0.2%, Si 0.1~0.55%, Mn 1.1~ 1.7%, P≤0.02%, S≤0.015%, Nb≤0.05%, V≤0.1%, Ti 0.007~0.05%, Cr 0.1~ 0.6%, Ni 0.2~1.4%, Cu≤0.35%, Mo 0.08~0.6%, Al 0.015~0.05%, B 0.0005~ 0.003% and surplus iron and inevitable impurity；It is prepared for high-intensitive, high tenacity seamless steel pipe.
In ocean engineering, configuration flows through high-pressure fluid inside the pipeline in seabed, and pipeline receiving is caused by wave Cyclic strain and seawater pressure, it is therefore desirable to which steel pipe used in pipeline is able to bear biggish shock resistance, and have Higher intensity and toughness, and since marine environment salinity is higher, it is also necessary to steel pipe Salt corrosion corrosion is excellent, leads for ocean The steel pipe research in domain also belongs to blank and uses the longevity when applying existing steel pipe in marine environment with high salt, by seawater dynamic impulsion It orders shorter, it would be highly desirable to which those skilled in the art's research is useful in ocean engineering, has high-intensitive, high tenacity and good anti-corrosion The seamless steel pipe of performance.
Summary of the invention
The object of the present invention is to provide a kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, it is applicable In ocean engineering, biggish sea washes and antiseptic property are born.
Foregoing invention purpose of the invention has the technical scheme that
A kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, according to the chemical constituent of weight percent are as follows: C 0.08~0.11%, Si 0.35~0.45%, Mn 0.8~1.5%, P 0.015~0.025%, S 0.005~0.01%, Cu 0.25~0.4%, Al 0.012~0.035%, W 0.8~1.2%, Re 0.05~0.3%, Ni 0.06~0.1%, Cr 0.2~0.5% and surplus are Fe and impurity forms.
By using above-mentioned technical proposal, C (carbon) is the hardenability for improving steel and the essential elements for improving intensity, when C contains When amount is less than 0.08%, hardenability is reduced, and influences intensity；When C content is greater than 0.11%, in a case where qt is applied, steel becomes To in having the microstructure such as bainite and/or martensite etc. quenched completely, the hardenability and intensity of steel are reduced；
Si (silicon) is the deoxidation purpose for steel and is added in steel, helps to improve intensity and improves steel during tempering Softening resistance is added 0.35~0.45% Si, can reduce the flexibility of steel；
The hardenability of steel can be improved in Mn (manganese), and 0.8~1.5% Mn is added, the intensity and hot-workability of steel are effectively improved, if Mn Content is more than 2%, can reduce the flexibility of steel；
P (phosphorus) exists in steel as impurity, because segregation of the P on crystal boundary can reduce the flexibility of steel, limits containing for P Amount is 0.015~0.025%, only microelement；
S (sulphur) exists in steel as impurity, because S generates sulfide such as MnS etc., reduces the intensity and corrosion resistance of steel, so The content for limiting S is less, is 0.005~0.01%；
Cu (copper) is added in common low-alloyed formula system, can improve the atmospheric corrosion performance of low-alloy steel, when Cu and P is multiple With in use, the intensity and yield ratio of low-alloy steel can be improved, and welding performance is not adversely influenced；Cupric 0.25~ 0.4% rail steel, in addition to wear-resisting, corrosion fatigue life is 2~5 times of carbon rail；When content is more than 0.75%, at solid solution After reason and timeliness, ageing strengthening effect can produce, will lead to copper brittleness phenomenon in thermal deformation processing；
Al (aluminium), which is added in steel, can be used as deoxidier, and Al plays refinement crystal grain in steel, fixes the nitrogen in steel, to significantly improve The impact flexibility of steel reduces cold short tendency and timeliness tendentiousness；The corrosion resistance of steel also can be improved in Al simultaneously, especially with When the elements such as molybdenum, copper, silicon, chromium cooperate, effect is more preferable；
The intensity, wearability and corrosion resistance of steel can be improved in W (tungsten), but content cannot be excessively high, limit the content of W as 0.8~ 1.2%, there is good thermal stability；
Re (rhenium) is added in low-alloy steel, the field trash of oxide and sulfide can be refined, to eliminate the field trashes such as MnS Harm；In production practice, S exists in the form of FeS, MnS in steel, and when Mn content is high in steel, the formability of MnS is just Height, although the fusing point of MnS is higher, MnS can extend along machine direction in machining deformation and become band, plasticity, the toughness of steel And fatigue strength significantly reduces, therefore Re is added in low-alloy steel and carries out deformation process；After Re element is added, low conjunction can be improved Inoxidizability, the corrosion resistance of Jin Gang, antioxidative effect are more than the elements such as silicon, aluminium, titanium, can improve the mobility of steel, subtract Few nonmetal inclusion keeps structure of steel fine and close, pure；The fine grain of steel can be also kept at high temperature, improve elevated temperature strength；
The intensity, toughness and good harden ability, high resistance and highly corrosion resistant of steel can be improved in Ni (nickel)；
The corrosion resistance of steel can be improved in Cr (chromium), adds the Cr of 0.2~0.5% micro content, that is, can reach excellent intensity model Level is enclosed, if intensity does not continue to increase yet more than 0.5%；The carbon equivalent of the application is no more than 4%, in basic components, adds Add W, Mo, forms complex role, may replace the V in conventional formulation, significantly improve the intensity and toughness of steel；Add Ti and Cr forms complex role, significantly improves the freezing corrosion of steel.
The present invention is further arranged to, according to the chemical constituent of weight percent are as follows: C 0.08~0.11%, Si 0.45 ~0.55%, Mn 1.6~1.8%, P 0.023~0.027%, S 0.012~0.018%, W 0.05~0.07%, Mo 0.02~0.05%, Nb 0.12~0.14%, Ti 0.03~0.05%, Cr 0.004~0.007% and surplus be Fe and Impurity composition.
The present invention is further arranged to, according to the chemical constituent of weight percent are as follows: C 0.10%, Si 0.50%, Mn 1.7%, P 0.025%, S 0.015%, W 0.06%, Mo 0.04%, Nb 0.13%, Ti 0.04%, Cr 0.005% And surplus is Fe and impurity forms.
By using above-mentioned technical proposal, continues the recipe ingredient for optimizing steel, the content range of each component is reduced, into one Step improves the intensity, toughness and Salt corrosion corrosion of steel pipe.
The present invention is further arranged to, which prepares with the following method:
(1) hot rolling solid core bar, temperature are 830~890 DEG C；
(2) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1110~1150 DEG C；
(3) at normal temperature, with deflection 60~120%, continuity longitudinal direction cold-pressing deformation is carried out to seamless steel pipe hollow billet；
(4) it is heat-treated:
A) it quenches: by seamless steel pipe constant-speed heating under the conditions of 860~930 DEG C, when by seamless steel tube wall pipe 1.5 minutes every millimeter Between keep the temperature, then come out of the stove rapidly, with Ar3+ 30 to 50 DEG C are initial temperature, and 150 DEG C or less are rapidly cooled in 5 seconds；
B) be tempered: constant-speed heating to 530~680 DEG C of temperature is kept the temperature, in 530~680 DEG C of temperature models for 1 minute by every millimeter of wall thickness Lower progress is enclosed, tempered sorbite is obtained.
By using above-mentioned technical proposal, under the conditions of 830~890 DEG C of temperature, solid core bar is made in hot rolling, is then existed At a temperature of 1110~1150 DEG C, drilling/rolling is pair by the way of carrying out cold extrusion at normal temperature at hollow seamless steel pipe Place mat early period of heat treatment, during facilitating austenitizing, crystal grain refinement, lattice is regular, further increases the strong of steel pipe The impact of degree, toughness and anti-flowing Seawater；Heat treatment process includes two stages, and constant-speed heating is to 860~930 DEG C and carries out Heat preservation, comes out of the stove be cooled to 150 DEG C or less rapidly；530~680 DEG C are again heated to, keeps the temperature within 1 minute, obtains by every millimeter of wall thickness Tempered sorbite, the seamless steel pipe fineness handled through the above process is smaller, structural strength is higher and corrosion resistance more preferably.
The present invention is further arranged to: using hydraulic pressure cold drawing machine to carry out in step (3) under 150~500 tons of pulling force cold Squeeze compressive deformation under longitudinal aximal deformation value.
By using above-mentioned technical proposal, cold extrusion is carried out to steel pipe using biggish pulling force, facilitates Uniform Tension steel Pipe is arranged regular to make each component crystal grain refinement in steel.
The present invention is further arranged to: being 25% sodium chloride and 8% emulsion by mass fraction in heat treatment a) It is dissolved in coolant liquid, improves liquid gasification temperature, and prevent in the surfaces externally and internally of seamless steel pipe with the impact of the flow velocity of 500L/min Only coolant liquid is isolated in high-temperature steam, leads to the excessive ferrite and pearlite of the bad generation of seamless steel pipe local location cooling.
By using above-mentioned technical proposal, since the partial size of Cr is larger, it is not easy to penetrate into steel pipe component, be pressed through in cold-extruded The component of Cheng Zhong, steel pipe stretch, and are heated again with the steam of high temperature, facilitate infiltration of the large-sized Cr in steel pipe.
The present invention is further arranged to: in heat treatment a), continuing to add mass fraction in coolant liquid to be 1~2% Carbon nanotube, and seamless steel pipe is impacted again with the flow velocity of 500L/min.
By using above-mentioned technical proposal, the steel alloy flexibility as prepared by the application is excellent, in Post isothermal treatment In molding, the alloy pipe of heat is constantly impacted using the coolant liquid containing 1~2% carbon nanotube, facilitates C content and penetrates into again In alloy pipe, C content is improved, further increases the intensity of steel pipe, and do not influence the brittleness of steel pipe.
The present invention is further arranged to: carbon nanotube being dissolved in the NaCl solution that mass fraction is 25%, weight ratio For 2~3:1, NaCl solution is fluidized state in course of dissolution, to be cooled spare.
By using above-mentioned technical proposal, carbon nanotube is dissolved in the NaCl solution of fluidized state, facilitates carbon and receives It is uniform, stable to facilitate solution composition for the abundant dissolution of mitron.
In conclusion advantageous effects of the invention are as follows:
1. in formula, carbon equivalent is no more than 4%, wherein W, Re form complex role, may replace the V in conventional formulation, significantly mention The high intensity of steel；It adds Al, Cu and Cr and forms complex role, significantly improve the freezing corrosion of steel；
2. the preparation method of seamless steel pipe is novel, heat rolling-forming solid core bar, perforation forms seamless steel pipe, then to seamless steel Pipe carries out cold extrusion, facilitates the crystal grain refinement of austenitizing, and in Cold Extrusion Process, Secondary Shocks exist again with high-temperature steam On seamless steel pipe, the infiltration of difficult infiltration metallic element is further increased；
3. during heat treatment, being dissolved in cooling using carbon nanotube since the metallic element ingredient of toughening in formula is higher In liquid, facilitate C ingredient and be dispersed in steel pipe, so that preparation has the seamless steel pipe compared with high impact resistance.
Specific embodiment
Invention is further described in detail with reference to embodiments.
Embodiment one:
A kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, prepares with the following method:
(1) C 0.08%, Si 0.35%, Mn 0.8%, P 0.015%, S ingredient: are weighed according to weight percent 0.005%, Cu 0.25%, Al 0.012%, W 0.8%, Re 0.05%, Ni 0.06%, Cr 0.2% and surplus are Fe And impurity；
(2) hot rolling solid core bar, temperature are 830 DEG C；
(3) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1110 DEG C；
(4) at normal temperature, the pulling force using hydraulic pressure cold drawing machine in 150t carries out continuity longitudinal direction cold-pressing deformation；
(5) it is heat-treated:
A) by seamless steel pipe constant-speed heating to 860 DEG C, according to the every millimeter of 1.5 minutes heat preservation of seamless steel tube wall pipe, heat preservation 15 Minute, then come out of the stove rapidly, i.e., the salt water curtain cooling zone for being 1.5% quickly through salt content, with Ar3+ 30 to 50 DEG C are starting Temperature is rapidly cooled to 150 DEG C or less in 5 seconds, wherein it is 25% sodium chloride, 8% cream that mass fraction is adulterated in coolant liquid Change liquid and carry out uniform stirring, by mixed liquor with the impact of the flow velocity of 500L/min seamless steel pipe surfaces externally and internally；
B) be tempered: constant-speed heating is kept the temperature, soaking time 5 minutes, at 520~540 DEG C for 1 minute to 530 DEG C according to every millimeter of wall thickness It is carried out under temperature range, obtains tempered sorbite.
Embodiment two:
A kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, prepares with the following method:
(1) C 0.09%, Si 0.38%, Mn 1.0%, P 0.018%, S ingredient: are weighed according to weight percent 0.007%, Cu 0.28%, Al 0.015%, W 1.0%, Re 0.1%, Ni 0.07%, Cr 0.3% and surplus are Fe And impurity；
(2) hot rolling solid core bar, temperature are 850 DEG C；
(3) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1120 DEG C；
(4) at normal temperature, the pulling force using hydraulic pressure cold drawing machine in 200t carries out continuity longitudinal direction cold-pressing deformation；
(5) it is heat-treated:
A) by seamless steel pipe constant-speed heating to 880 DEG C, according to the every millimeter of 1.5 minutes heat preservation of seamless steel tube wall pipe, heat preservation 20 Minute, then come out of the stove rapidly, i.e., the salt water curtain cooling zone for being 1.5% quickly through salt content, with Ar3+ 30 to 50 DEG C are starting Temperature is rapidly cooled to 150 DEG C or less in 5 seconds, wherein it is 25% sodium chloride, 8% cream that mass fraction is adulterated in coolant liquid Change liquid and carry out uniform stirring, by mixed liquor with the impact of the flow velocity of 500L/min seamless steel pipe surfaces externally and internally；
B) be tempered: constant-speed heating is kept the temperature, soaking time 10 minutes, 550~570 for 1 minute to 560 DEG C according to every millimeter of wall thickness It is carried out under DEG C temperature range, obtains tempered sorbite.
Embodiment three:
A kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, prepares with the following method:
(1) ingredient: according to weight percent weigh C 0.1%, Si 0.40%, Mn 1.2%, P 0.021%, S 0.007%, Cu 0.30%, Al 0.02%, W 1.2%, Re 0.15%, Ni 0.08%, Cr 0.35% and surplus are Fe and impurity；
(2) hot rolling solid core bar, temperature are 870 DEG C；
(3) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1130 DEG C；
(4) at normal temperature, the pulling force using hydraulic pressure cold drawing machine in 300t carries out continuity longitudinal direction cold-pressing deformation；
(5) it is heat-treated:
A) by seamless steel pipe constant-speed heating to 900 DEG C, according to the every millimeter of 1.5 minutes heat preservation of seamless steel tube wall pipe, heat preservation 15 Minute, then come out of the stove rapidly, i.e., the salt water curtain cooling zone for being 1.5% quickly through salt content, with Ar3+ 30 to 50 DEG C are starting Temperature is rapidly cooled to 150 DEG C or less in 5 seconds, wherein it is 25% sodium chloride, 8% cream that mass fraction is adulterated in coolant liquid Change liquid and carry out uniform stirring, by mixed liquor with the impact of the flow velocity of 500L/min seamless steel pipe surfaces externally and internally；
B) be tempered: constant-speed heating is kept the temperature, soaking time 5 minutes, at 590~610 DEG C for 1 minute to 600 DEG C according to every millimeter of wall thickness It is carried out under temperature range, obtains tempered sorbite.
Example IV:
A kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, prepares with the following method:
(1) C 0.11%, Si 0.43%, Mn 1.3%, P 0.023%, S ingredient: are weighed according to weight percent 0.008%, Cu 0.33%, Al 0.025%, W 1.2%, Re 0.2%, Ni 0.085%, Cr 0.40% and surplus are Fe and impurity；
(2) hot rolling solid core bar, temperature are 880 DEG C；
(3) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1140 DEG C；
(4) at normal temperature, the pulling force using hydraulic pressure cold drawing machine in 400t carries out continuity longitudinal direction cold-pressing deformation；
(5) it is heat-treated:
A) by seamless steel pipe constant-speed heating to 920 DEG C, according to the every millimeter of 1.5 minutes heat preservation of seamless steel tube wall pipe, heat preservation 15 Minute, then come out of the stove rapidly, i.e., the salt water curtain cooling zone for being 1.5% quickly through salt content, with Ar3+ 30 to 50 DEG C are starting Temperature is rapidly cooled to 150 DEG C or less in 5 seconds, wherein it is 25% sodium chloride, 8% cream that mass fraction is adulterated in coolant liquid Change liquid and carry out uniform stirring, by mixed liquor with the impact of the flow velocity of 500L/min seamless steel pipe surfaces externally and internally；
B) be tempered: constant-speed heating is kept the temperature, soaking time 5 minutes, at 620~640 DEG C for 1 minute to 630 DEG C according to every millimeter of wall thickness It is carried out under temperature range, obtains tempered sorbite.
Embodiment five:
A kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, prepares with the following method:
(1) C 0.11%, Si 0.45%, Mn 1.5%, P 0.025%, S ingredient: are weighed according to weight percent 0.009%, Cu 0.38%, Al 0.03%, W 1.2%, Re 0.25%, Ni 0.09%, Cr 0.45% and surplus are Fe And impurity；
(2) hot rolling solid core bar, temperature are 890 DEG C；
(3) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1150 DEG C；
(4) at normal temperature, the pulling force using hydraulic pressure cold drawing machine in 500t carries out continuity longitudinal direction cold-pressing deformation；
(5) it is heat-treated:
A) by seamless steel pipe constant-speed heating to 930 DEG C, according to the every millimeter of 1.5 minutes heat preservation of seamless steel tube wall pipe, heat preservation 15 Minute, then come out of the stove rapidly, i.e., the salt water curtain cooling zone for being 1.5% quickly through salt content, with Ar3+ 30 to 50 DEG C are starting Temperature is rapidly cooled to 150 DEG C or less in 5 seconds, wherein it is 25% sodium chloride, 8% cream that mass fraction is adulterated in coolant liquid Change liquid and carry out uniform stirring, by mixed liquor with the impact of the flow velocity of 500L/min seamless steel pipe surfaces externally and internally；, in the present embodiment In, it is pre-processed, carbon nanotube is dissolved in the sodium chloride solution that mass fraction is 25%, weight ratio before adding sodium chloride For 2:1, NaCl solution is fluidized state in course of dissolution, is used after cooling
B) be tempered: constant-speed heating is kept the temperature, soaking time 5 minutes, at 640~660 DEG C for 1 minute to 650 DEG C according to every millimeter of wall thickness It is carried out under temperature range, obtains tempered sorbite.
Embodiment six:
A kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, prepares with the following method:
(1) ingredient: according to weight percent weigh C 0.11%, Si 0.45%, Mn 1.5%, P 0.025%, S 0.01%, Cu 0.4%, Al 0.035%, W 1.2%, Re 0.3%, Ni 0.1%, Cr 0.50% and surplus are Fe and impurity；
(2) hot rolling solid core bar, temperature are 890 DEG C；
(3) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1150 DEG C；
(4) at normal temperature, the pulling force using hydraulic pressure cold drawing machine in 500t carries out continuity longitudinal direction cold-pressing deformation；
(5) it is heat-treated:
A) by seamless steel pipe constant-speed heating to 930 DEG C, according to the every millimeter of 1.5 minutes heat preservation of seamless steel tube wall pipe, heat preservation 15 Minute, then come out of the stove rapidly, i.e., the salt water curtain cooling zone for being 1.5% quickly through salt content, with Ar3+ 30 to 50 DEG C are starting Temperature is rapidly cooled to 150 DEG C or less in 5 seconds, wherein it is 25% sodium chloride, 8% cream that mass fraction is adulterated in coolant liquid Change liquid and carry out uniform stirring, by mixed liquor with the impact of the flow velocity of 500L/min seamless steel pipe surfaces externally and internally；
B) be tempered: constant-speed heating is kept the temperature, soaking time 5 minutes, at 670~690 DEG C for 1 minute to 680 DEG C according to every millimeter of wall thickness It is carried out under temperature range, obtains tempered sorbite.
Comparative example:
The each component referred in the Chinese patent that application reference number is 201310236531.6, prepares with the following method:
(1) ingredient: according to weight percent weigh C≤0.2%, Si 0.1~0.55%, Mn 1.1~1.7%, P≤ 0.02%, S≤0.015%, Nb≤0.05%, V≤0.1%, Ti 0.007~0.05%, Cr 0.1~0.6%, Ni 0.2 ~1.4%, Cu≤0.35%, Mo 0.08~0.6%, Al 0.015~0.05%, B 0.0005~0.003% and surplus Iron and inevitable impurity；
(2) hot rolling solid core bar, temperature are 930 DEG C；
(3) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1100 DEG C；
(4) it is heat-treated:
A) seamless steel pipe is kept the temperature into 3min under the conditions of 910 DEG C, then with Ar3For initial temperature, carried out with 5 DEG C/sec of speed It is cooling, it is cooled to 150 DEG C or less；
B) it is tempered: being carried out under 650 DEG C of temperature ranges, obtain tempered sorbite.
Detection means:
(1) intensity: the wall thickness central portion of the seamless steel pipe prepared by each embodiment and comparative example, which is extracted, meets JIS Z Then 2201 tension test sheet uses tension test sheet, implements in the atmosphere of room temperature (25 DEG C) and meet JIS Z 2241 Tension test acquired yield stress and tensile strength using tension test.
(2) toughness: the wall thickness central portion of the seamless steel pipe prepared by each embodiment and comparative example, which is extracted, meets JIS Z Then 2202 v-notch test film uses each v-notch test film, implement the Charpy-type test for meeting JIS Z 2242.
(3) rust quality: each embodiment and comparative example being placed in and is loaded in the sink containing 5%NaCl, and standing time is 1d, 3d, 7d, 14d, 21d, 30d observe the production of surface rusty stain respectively, and recording surface generates rusty stain situation；If surface without Variation, then be "None".
(4) it salt water resistance corrosivity: provides to carry out according to GB/T 1734-1988, by each embodiment sample and comparative example It is dipped in medium as defined in GB/T6682, if not occurring blistering, picking, without the ill phenomenon such as obvious loss of gloss, discoloration, can evaluate " without exception ".
Intensity and toughness testing result are as shown in the table:
By upper table it is found that the sample of each embodiment has excellent intensity and toughness, facilitate the impact force for resisting seawater, it can Illustrate that each component crystal grain refinement is uniform in embodiment；And the performance indicator of comparative example is weaker than embodiment sample, shows the application's Properties of sample is more excellent.
Corrosion resistant and the testing result of salt resistance aqueous corrosion are as shown in the table:
By upper table it is found that the sample resistant tarnishing of the application and salt water resistance corrosivity are very excellent, and the steel pipe of comparative example exists After testing 7d, steel tube surface gradually appears yellow spotting, and salt water resistance corrosivity reduces.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it It is interior.

Claims (8)

1. a kind of special seamless steel pipe of ocean engineering superhigh intensity fine grain, which is characterized in that according to weight percent Chemical constituent are as follows: C 0.08 ~ 0.11%, Si 0.35 ~ 0.45%, Mn 0.8 ~ 1.5%, P 0.015 ~ 0.025%, S 0.005 ~ 0.01%、Cu 0.25~0.4%、Al 0.012~0.035%、W 0.8~1.2%、Re 0.05~0.3%、Ni 0.06~0.1%、Cr 0.2 ~ 0.5% and surplus be that Fe and impurity form.
2. the special seamless steel pipe of ocean engineering according to claim 1 superhigh intensity fine grain, which is characterized in that press According to the chemical constituent of weight percent are as follows: C 0.08 ~ 0.11%, Si 0.38 ~ 0.43%, Mn 1.0 ~ 1.3%, P 0.018 ~ 0.023%、S 0.007~0.009%、Cu 0.30~0.38%、Al 0.02~0.03%、W 0.8~1.2%、Re 0.1~0.2%、Ni 0.08 ~ 0.09%, Cr 0.3 ~ 0.4% and surplus are Fe and impurity forms.
3. the special seamless steel pipe of ocean engineering according to claim 1 superhigh intensity fine grain, which is characterized in that press According to the chemical constituent of weight percent are as follows: C 0.10%, Si 0.40%, Mn 1.1%, P 0.02%, S 0.008%, Cu 0.35%, Al 0.025%, W 0.10%, Re 0.15%, Ni 0.08%, Cr 0.35% and surplus are Fe and impurity forms.
4. the special seamless steel pipe of the superhigh intensity fine grain of ocean engineering described in any one according to claim 1 ~ 3, It is characterized in that preparing with the following method:
(1) hot rolling solid core bar, temperature are 830 ~ 890 DEG C；
(2) drilling/rolling is carried out to solid core bar and forms seamless steel pipe, temperature is 1110 ~ 1150 DEG C；
(3) at normal temperature, with deflection 60 ~ 120%, continuity longitudinal direction cold-pressing deformation is carried out to seamless steel pipe hollow billet；
(4) it is heat-treated:
A) it quenches: by seamless steel pipe constant-speed heating under the conditions of 860 ~ 930 DEG C, when by seamless steel tube wall pipe 1.5 minutes every millimeter Between keep the temperature, then come out of the stove rapidly, with Ar3+ 30 to 50 DEG C are initial temperature, and 150 DEG C or less are rapidly cooled in 5 seconds；
B) be tempered: constant-speed heating to 530 ~ 680 DEG C of temperature is kept the temperature, in 530 ~ 680 DEG C of temperature ranges for 1 minute by every millimeter of wall thickness Lower progress, obtains tempered sorbite.
5. the special seamless steel pipe of ocean engineering according to claim 4 superhigh intensity fine grain, it is characterised in that: step Suddenly compressive deformation under the aximal deformation value of cold extrusion longitudinal direction is carried out under 150 ~ 500 tons of pulling force using hydraulic pressure cold drawing machine in (3).
6. the special seamless steel pipe of ocean engineering according to claim 4 superhigh intensity fine grain, it is characterised in that: In heat treatment a), it is that 25% sodium chloride and 8% emulsion are dissolved in coolant liquid by mass fraction, improves liquid gasification temperature Degree, and prevent high-temperature steam that coolant liquid is isolated in the surfaces externally and internally of seamless steel pipe with the impact of the flow velocity of 500L/min, cause seamless The excessive ferrite and pearlite of the steel pipe partial position bad generation of cooling.
7. the special seamless steel pipe of ocean engineering according to claim 6 superhigh intensity fine grain, it is characterised in that: In heat treatment a), continue to add the carbon nanotube that mass fraction is 1 ~ 2% in coolant liquid, and again with the flow velocity of 500L/min Impact seamless steel pipe.
8. the special seamless steel pipe of ocean engineering according to claim 7 superhigh intensity fine grain, it is characterised in that: will Carbon nanotube is dissolved in the NaCl solution that mass fraction is 25%, and weight ratio is 2 ~ 3:1, and NaCl solution is boiling in course of dissolution State is risen, it is to be cooled spare.
CN201811223431.9A 2018-10-19 2018-10-19 The special seamless steel pipe of ocean engineering superhigh intensity fine grain Pending CN109972031A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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
CN110788160A (en) * 2019-11-07 2020-02-14 鑫鹏源智能装备集团有限公司 Seamless steel tube production system and process

Cited By (2)

* Cited by examiner, † Cited by third party
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
CN110788160A (en) * 2019-11-07 2020-02-14 鑫鹏源智能装备集团有限公司 Seamless steel tube production system and process

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Application publication date: 20190705