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CN107177797A - The oil gas field anti-corrosion drilling tool steel of 130KSI, 135KSI rank and its manufacture method - Google Patents

The oil gas field anti-corrosion drilling tool steel of 130KSI, 135KSI rank and its manufacture method Download PDF

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Publication number
CN107177797A
CN107177797A CN201710269733.9A CN201710269733A CN107177797A CN 107177797 A CN107177797 A CN 107177797A CN 201710269733 A CN201710269733 A CN 201710269733A CN 107177797 A CN107177797 A CN 107177797A
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Prior art keywords
steel
drilling tool
130ksi
temperature
135ksi
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CN107177797B (en
Inventor
邵淑艳
孔祥伟
顾铁
胡绍鑫
冀鸰
李芸
黄镇
聂爱诚
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/004Heat treatment of ferrous alloys containing Cr and Ni
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/008Heat treatment of ferrous alloys containing Si
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/22Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

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

Abstract

The present invention relates to high tough, hydrogen sulfide corrosion resistant round steel and its manufacture method, the chemical composition of the round steel is C by mass percentage:0.25~0.40%, Si:0.20~0.45%, Mn:0.95~1.50%, Cr:1.35~1.90%, S:≤ 0.002%, P:≤ 0.008%, Mo:0.75~1.30%, Ni:0.10~0.30%, V:0.05~0.25%, Nb:0.010~0.050%, Cu:0.10 ~ 0.30%, Al:≤ 0.050%, Ca:0.0005~0.005%, surplus is Fe and inevitable impurity element.Hot rolled circular steel is produced through continuous casting and rolling annealing process route, the drilling tool semi-finished product heat treatment that round steel is directly heat-treated or processed.Product is tested, in saturation H under the premise of correlation 130KSI, 135KSI comprehensive mechanical performance is met respectively by U.S. NACE TM0177 standards anti-H 2 S stress corrosion2720 hours are preloaded under the conditions of 70% nominal yield stress in S solution constantly.Material is applied to acid-soluble oil, the 130KSI under gas-field exploitation environment, 135 KSI intensity rank drilling tool materials'uses.

Description

The oil gas field anti-corrosion drilling tool steel of 130KSI, 135KSI rank and its manufacture method
Technical field
The invention belongs to round steel preparation field, and in particular to a kind of to be used with continuous casting for molding-rolling production petroleum-gas fiedl exploitation The resistance to H of 130KSI, 135KSI grade of steel2S corrodes drilling tool steel and its manufacture method.
Background technology
With the development of World Economics, energy resource consumption increases sharply, and the easily production of resources such as conventional oil, natural gas is increasingly It is few, it is difficult to meet growing energy demand.Petroleum-gas fiedl exploitation work have to deep-sea, desert, the polar areas and The strong corrosive medium such as sulfide hydrogen, carbon dioxide environmental area develops.The resistance to H of conventional 110KSI grade of steels2S corrodes and 120KSI steel The simple drill material of level works under current severe mining environment often occurs drilling tool failure, causes drilling system even whole Scrapping for mouth well, brings tremendous economic etc. to lose to petroleum-gas fiedl.Therefore common drilling tool material can not have been met under the new situation Petroleum-gas fiedl exploits the manufacture demand of product.
Energy market is in the urgent need to researching and developing a kind of anti-H of new higher intensity and low-temperature resistance toughness2S corrodes low-alloy drilling tool Steel material, to meet the new demand of ferrous materials under new energy mining environment.But new material will to meet harsh working environment Ask, it is necessary to reach higher technical indicator, the elemental composition of steel is designed and produced, is fabricated to a difficult point, and the country is currently without one Plant high tough, the anti-H higher than 120KSI grade of steels2Drilling tool steel is used in the petroleum-gas fiedl exploitation of S corrosion.
The content of the invention
High tough, the anti-H of petroleum-gas fiedl exploitation is met it is an object of the invention to provide one kind2S burn into high reliability etc. The drilling tool steel new material of particular/special requirement, realizes its design and production, manufacture.The present invention is optimized by the chemical element component to steel Design, has invented a kind of petroleum-gas fiedl exploitation low-alloy drilling tool steel, has belonged to the drilling tool steel grade of 130KSI135KSI ranks.
The present invention additionally provides the manufacture method of above-mentioned drilling tool steel new material.
The technical scheme that present invention solution above-mentioned technical problem is used is a kind of oil gas field is with 130KSI, 135KSI grades Not anti-corrosion drilling tool steel, the chemical element component of the steel is designed as C by mass percentage:0.25~0.40%, Si:0.20~ 0.45%, Mn:0.95~1.50%, Cr:1.35~1.90%, S:≤ 0.002%, P:≤ 0.008%, Mo:0.75~1.30%, Ni: 0.10~0.30%, V:0.05~0.25%, Nb:0.010~0.050%, Cu:0.10~0.30%, Al:≤ 0.050%, Ca: 0.0005~0.005%, surplus is Fe and inevitable impurity element.
Further speaking, this new material is in routine on the basis of low-carbon alloy steel composition design, and addition Nb, V, Ni reach To crystal grain thinning and obdurability purpose is improved, while the strictly control impurity content such as P, S, and add a small amount of Cu elements and carry High corrosion resistance, adds micro Ca elements, improves the degree of purity of steel, the Design of Chemical Composition of drilling tool steel of the present invention is according to such as Under:
1st, the determination of C content
C is most basic element in steel, is also most economical intensified element, by solution strengthening and coordinates carbide former Precipitation strength, the intensity of steel is improved, but C content is too high that the modeling of steel, malleable band can be adversely affected, while C content height meeting Welding and the decay resistance of steel are reduced, the scope of C content of the present invention is defined as 0.25~0.40%, and the present invention relates to steel category In middle low carbon steel category.
2nd, the determination of Si contents
Si can be also basic solution strengthening element, improve quenching degree, the element knot such as Si and Mo, W, Cu as deoxidant element Corrosion resistance and antioxidation can be improved during conjunction.But Si too high levels add ferritic fragility, make the overheat in steel Sensitiveness, crack sensitivity and decarburizing tendency increase.The scope of Si contents of the present invention is defined as 0.20-0.45%.
3rd, the determination of Mn contents
Mn is the solution strengthening element of steel, can significantly improve the quenching degree of steel, and improves Heat-Treatment of Steel performance, strengthens the base of steel Body and refinement pearlite, so as to improve the intensity and hardness of steel, and manganese alloy is again more inexpensive easily takes, and is that high intensity levels steel is designed In preferred elements.Another Mn is also the deoxidant element in steelmaking process, can fix the form of sulphur in steel, is formed and Steel Properties are endangered Less MnS and(Fe、Mn)S, reduces or suppresses FeS formation, reduces the hot-short tendency of steel, improves the thermoplasticity of steel.But steel Middle Mn too high levels, can produce obvious temper brittleness phenomenon, and Mn has the promotion crystal grain effect of growing up, and can cause the mistake of steel Heat sensitivity and crack tendence enhancing, dimensional stability reduction, to product using having a negative impact.Mn is also easily partially simultaneously Element is analysed, longitudinal tissue's banding that too high content easily causes steel is serious, reduces properties of product uniformity.In summary factor shadow Ring, should design the Mn elements of certain content, improve hardenability of steel, strong hardness, the heat treatment performance of stabilized steel, Mn contents are again It is unsuitable too high, its adverse effect is reduced as far as possible, and Mn content ranges of the present invention are defined as 0.95~1.50%.
4th, the determination of Cr contents
Cr is medium carbide former, it is possible to increase quenching degree, wearability and the decay resistance of steel.Cr in steel, one Aliquot replacement iron formation alloyed cementite, improves the intensity and hardness of steel, moreover it is possible to steel is kept some strength in high temperature;One Divide and dissolve in ferrite, produce solution strengthening, improve ferritic intensity and hardness.In addition, the overheat that Cr can also reduce steel is inclined To with skin decarburization speed.But Cr too high levels can improve the brittle transition temperature of steel, promote steel belt roof bolt fragility.The present invention is examined Considering steel needs to insert intensity, hardness, corrosion resistance that higher Cr constituent contents ensure steel in higher-strength rank, design Can, but consider to avoid it from adversely affecting again, the scope of Cr contents is defined as 1.35~1.90% by the present invention.
5th, the determination of Mo contents
Mo is carbide former, slightly stronger than Cr with C binding abilities, and quenching degree can be improved by being combined with Cr, Ni, and refinement is brilliant Grain, improves toughness, improves carbide inhomogeneities, and its carbide is stable, and high temperature also is difficult to shift to solid solution, and alternative W is carried Gao Gang heat resistance.To the structural alloy steel of heat treatment, temper brittleness can be substantially reduced, the toughness of steel is improved.Steel of the present invention Because that need to ensure higher low-temperature flexibility, therefore it is 0.75~1.30% that design, which puies forward the scope of high Mo content,.
6th, the determination of V content
V is carbide, and the VC spreads are high and stably, with very strong Grain refinement, improve the intensity of steel, Toughness.With C-shaped into VC carbide, the wearability of steel is improved, while steel hydrogen attack resistance can be improved.When material is welded, energy Enough prevent weld grain thick, improve the solderability of steel.The scope of V content of the present invention is defined as 0.05~0.25%.
7th, the determination of Ni contents
Nickel is the alloying element of non-carbide formation, and nickel is almost completely dissolved into ferrite in equilibrium conditions, crystal grain during heating Be difficult to grow up, nickel can significantly improve steel quenching degree improve again intensity,(Low temperature)Toughness and plasticity, reduce the Transition of Brittleness of steel Temperature, but nickel content is too high, because it is precious metal, can increase cost, and the scope of Ni contents is defined as 0.10 by the present invention~ 0.30%。
8th, the determination of Nb contents
Nb is typical micro alloying element, can form carbon, nitride, and high temperature, which is separated out, coordinates TMCP, and pinning austenite grain boundary reaches To grain refinement effect, steel is in austenitizing, and carbon, nitride equally prevent Austenite Grain Growth.Form carbon, nitride the Two-phase particle improves intensity, but plasticity and toughness have declined.The scope of Nb contents of the present invention is defined as 0.010~ 0.050%。
9th, the determination of S, P content
S, P are the inevitable impurity element in steel, easily form segregation, the defect such as be mingled with.P, which is dissolved in ferrite, turns round crystal grain It is bent, thick, and increase cold brittleness.S makes steel produce red brittleness, reduces the ductility and toughness of steel.The present invention is anti-for guarantee steel The performances such as corrosion, control P≤0.008%, S≤0.002%.
10th, the determination of Ca contents
Ca has remarkable effect to the rotten of steel inclusion, makes inclusion balling, is evenly distributed to reduce to toughness not Profit influence, while also improving the mobility of molten steel, improves nozzle blocking problem.Controlled in the present invention Ca contents for 0.0005~ 0.005%, and Ca/S >=1.
11st, the determination of Cu contents
Cu is the basic element for improving corrosion resistance, steel can be promoted to produce anodic passivity, so as to reduce the corrosion rate of steel.Cu Enrichment can significantly improve the protective value of rusty scale in rusty scale.In addition, Cu, Si element in Cr and steel coordinate and can significantly improved The decay resistance of steel.Cu contents 0.10~0.20% are controlled in the present invention.
12nd, the determination of Al content
Al is added as deoxidant element in steel, in addition in order to reduce the dissolved oxygen in molten steel, the tiny nitrogen of Al and N formation disperses Changing alumina particles can be with crystal grain thinning, but Al content is big, and Al is easily formed during molten steel2O3Deng brittle inclusion, molten steel is reduced The scope of Al content is defined as≤0.050% in degree of purity, therefore the present invention.
The present invention separately provides production and the manufacture method of the anti-corrosion drilling tool steel of above-mentioned oil gas field 130KSI, 135KSI rank, Production for molding mode is smelted using continuous casting by described steel grade characteristic, the raw materials for metallurgy selected pre-processed through KR molten iron successively- Refining-LF stoves refining-VD/RH stoves vacuum degassing treatment tech at the beginning of electric furnace/converter produces high cleanliness molten steel, according to the production of bar Size requires that molten steel obtains 300mm × 340mm, 390 × 510mm or ¢ 600mm rectangle or circle through whole argon gas protective casting Shape continuous casting billet;Continuous casting billet is offline more than 550 DEG C to enter to cheat slow cooling, and temperature retention time more than 60 hours enters the continuous casting billet after slow cooling Row shotblasting is handled, to improve the surface quality of strand, it is to avoid the surface defect that influence steel are used is produced during hot-working.
The good strand of surface quality is heated to 1200~1280 DEG C in the heating furnace of weak oxide atmosphere, according to strand Size difference controls the heating and thermal insulation time of strand to be 5-20 hours, and the continuous casting billet after coming out of the stove enters thick after high-pressure water descaling Roll-in roll-mm finishing mill unit rolled, start rolling temperature is 1150-1230 DEG C, and 900-980 DEG C of finishing temperature rolls rear bar on-line Sawing, control is offline more than 500 DEG C to enter to cheat slow cooling, and burial pit air cooling is gone out when bar temp is down to below 180 DEG C.
Bar after cooling is subjected to offline stress relief annealing, annealing insulation in the heat-treatment furnace that continous way nitrogen is protected Temperature is 670~720 DEG C, and bar is furnace-cooled to less than 300 DEG C air coolings of coming out of the stove after being fully incubated burning.Finally to Surface of Rod Bar peeling Processing, and carry out surface inspection(Target is N-0.3mm)And ultrasonic examination (FBH of ASTM A388 standards=3.2 mm) inspection Survey.
The qualified bar of flaw detection directly makees modifier treatment or is processed as modifier treatment again after semi-finished product drilling tool part, product machine Tool performance has respectively reached the anticorrosive drilling tool demand of technical standard of 135KSI grade of steels and 130KSI grade of steels.
Technology for Heating Processing is as follows:Normalizing heating-up temperature is 920~980 DEG C, and time inside furnace is 200~600min, soaking zone Temperature control precision:± 10 DEG C, control stove roller speed is not more than 550mm/min;Quenching temperature is 860~940 DEG C, in stove Time is 300~600min, soaking zone temperature control precision:± 8 DEG C, control stove roller speed is not more than 500mm/min, using quenching Fire ring water quenching, water temperature controls 20-35 DEG C;Tempering heating-up temperature is 570~650 DEG C, soaking zone temperature control precision:± 5 DEG C, The stove time is 400~600min, and control stove roller speed is not more than 200mm/min, and air cooling or water cooling are to room temperature after coming out of the stove.
Preferably, described quench with tempering process is carried out in the roller-bottom type continuous oven of heated by natural gas.
Compared with prior art, the advantage of the invention is that:
(1) a kind of high intensity, low-temperature resistance, anti-H for being suitable for petroleum-gas fiedl exploitation 130KSI, 135KSI grade of steel is provided2S is rotten Lose drilling tool steel new material and production, manufacture method.
(2) optimization design is obtained according to round steel elemental composition produced by the invention, at its different drilling tool products produced heat Excellent combination of strength and toughness is reached after reason, 130KSI, 135KSI are satisfied by the height of petroleum-gas fiedl exploitation key stressed member Intensity, low-temperature resistance toughness reguirements.
(3)Stronger corrosion resistance has been reached after different drilling tool products heat treatment produced by the invention, the is being reached (2)On the premise of bar mechanical performance, the experiment of U.S. NACE TM0177 standards anti-H 2 S stress corrosion is met(Detection method A), In saturation H270% nominal yield stress is preloaded in S solution(70%SMYS)Under the conditions of 720 hours constantly.Meet petroleum-gas fiedl The anti-H of exploitation key stressed member2The requirement of S etching characteristics.
(4)Round steel produced by the present invention is using abbreviated system of the continuous casting for molding-tandem rolling(KR-BOF-LF-RH-CCM- CR or EAF-LF-VD-CCM-CR), production petroleum-gas fiedl exploitation tough, the anti-H of height2S corrodes drilling tool material, has saved production work Sequence and cost.
(5)Hot-roll annealing and qualified bar of detecting a flaw directly are heat-treated or are processed as after drilling tool half-finished parts at heat Reason, Technology for Heating Processing is as follows:Normalizing heating-up temperature is 920~980 DEG C, and time inside furnace is 200~600min, soaking zone temperature control Precision processed:± 10 DEG C, control stove roller speed is not more than 550mm/min;Quenching temperature is 860~940 DEG C, and time inside furnace is 300~600min, soaking zone temperature control precision:± 8 DEG C, control stove roller speed is not more than 500mm/min, uses quenching ring water Quench, water temperature controls 20-35 DEG C;Tempering heating-up temperature is 570~650 DEG C, soaking zone temperature control precision:± 5 DEG C, time inside furnace For 400~600min, control stove roller speed is not more than 200mm/min, and air cooling or water cooling are to room temperature after coming out of the stove.
The present invention is directed to petroleum-gas fiedl 130KSI and 135KSI high intensity, the demand of the anticorrosive drilling tool steel of high/low temperature toughness, Protected using the elemental composition design of optimization, the whole argon gas of the molten steel of high cleanliness, non-metallic inclusion denaturation treatment, low overheat The continuous casting billet of shield cast production passes through follow-up rolling, annealing, flaw detection and drilling tool material entirety or semi-finished product as rolling blank Normalizing+quenching+tempering the heat treatment in continuous roller-hearth heat treatment furnace of drilling tool part produces hardened depth, heat treatment mechanicalness Can be high, even tissue, stably, segregation is small, high intensity, the anticorrosive drilling tool round steel of low-temperature impact resistance toughness.It is produced by the present invention Round steel maximum gauge is up to 300mm.
Compared with prior art, main innovation of the invention is:
(1)Steel improve the quenching degree of steel and the optimization design of obdurability host element by C, Mn, Cr, Mo etc., and add micro The elements such as V, Nb, Ni, Cu, its steel crystal grain is more tiny, the steel layer tissue that hardens is deeper, heat treatment after mechanical performance it is higher, The anticorrosive drilling tool Steel material of novel high-strength/tenacity of tissue evenly, stable, the tensile strength of new material, yield strength, low temperature The important technology index of the drilling tool materials'use such as impact flexibility, hardness is significantly improved.The drilling tool product of bar production is in wall thickness two / mono- position sample is examined:1. 135KSI grade of steels drilling tool product mechanical performance is met:Yield strength 931-1034MPa, tension Intensity >=1000MPa, elongation percentage >=13%, the contraction percentage of area >=40%, -20 DEG C of low temperature Charpy-V impact power >=42J, total cross-section is hard Spend 302-352HBW;2. 130KSI grade of steels drilling tool product mechanical performance is met:Yield strength 897-1069MPa, tensile strength >= 1000MPa, elongation percentage >=13%, the contraction percentage of area >=40%, -20 DEG C of low temperature Charpy-V impact power >=54J, total cross-section hardness 302- 341HBW.Solve petroleum-gas fiedl under pickling environment to exploit, key stressed member is only capable of reaching always the bottle of 110KSI intensity ranks Neck, meets the higher drilling tool material market requirement of new oil, gas-field exploitation environment.
(2)Its drilling tool product of round steel produced by the present invention carries out normalizing+quenching+tempering processing using roller-bottom type continuous oven, By the tissue of normalized treatment uniform stabilization steel before quenching, and improve the austenitizing holding temperature of steel and ensure the abundant of steel Austenitizing time, drawing process is fully handled, and deepens the overall quench-hardened case tissue of steel, to be heat-treated mechanical performance higher, more Uniformly, stably, its low-temperature flexibility also shows under the premise of the higher-strength of round steel 130KSI, 135KSI strength grade, hardness is ensured Write and improve, while allowing the hydrogen sulfide corrosion resistance of steel can be more excellent, meet U.S. NACE TM0177 standard anti-H 2 Ss stress rotten Corrosion test(Detection method A), in saturation H270% nominal yield stress is preloaded in S solution(70%SMYS)Under the conditions of 720 hours Constantly.The form for being organized as tempered sorbite or tempered sorbite and a small amount of bainite of quenched rear round steel.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of 135KSI round steel in embodiment 1;
Fig. 2 is the metallographic structure figure of 130KSI round steel in embodiment 2.
Embodiment
It is for a more detailed description to technical scheme below in conjunction with presently preferred embodiments of the present invention.But the grade is implemented Example is only the description to better embodiment of the present invention, and can not produce any limitation to the scope of the present invention.
Embodiment 1
The exploitation of oil-gas field that the present embodiment the is related to a diameter of 170mm of drilling tool Steel Bar, comprising elemental composition and its quality Percentage composition:C:0.28%, Si:0.25%, Mn:0.97%, P:0.007%, S:0.002%, Cr:1.42%, Mo:0.88%, V: 0.08%, Nb:0.027%, Ni:0.13 %, Cu:0.12%, Al:0.027%, Ca:0.0027%, surplus is Fe and impurity element.
The production technology of above-mentioned bar is as follows:
By the chemical element component composition configuration raw materials for metallurgy of above-mentioned steel, KR molten iron pretreatment-refining-LF stoves at the beginning of converter are carried out successively Refining-RH stoves vacuum outgas -390 × 510mm of continuous casting rectangular blooms-strand slow cooling-strand ball blast-continuous-type furnace heating-height Press the detection such as water de-scaling-tandem rolling-bar slow cooling-stress relief annealing-peeling-ultrasonic examination+surface inspection-quenched-storage.
That implements comprises the concrete steps that:
1)KR molten iron pretreatments are carried out, the impurity contents such as P, S of molten iron are removed into a part, refined at the beginning of then entering converter;Again Through LF stoves refine, during strengthen deoxidation;Refining terminates rear ladle and is transferred to the progress vacuum outgas of RH stoves, removes gas and field trash.
2)The target control of the continuous casting steel degree of superheat realizes that low overheat is poured at 15~30 DEG C using tundish sensing heating Note, coordinates M-EMS, Continuous Casting Soft Reduction technique reduction continuous casting slab segregation, improves internal soundness.
3)550 DEG C of high temperature above of continuous casting billet are offline, enter burial pit and are incubated more than 60 hours, casting blank cleavage are prevented, by slow cooling Continuous casting billet Shot Blasting afterwards, improves its surface quality, the generation of surface genetic defects when reducing strand milling round steel.
4)Continuous casting billet is heated to 1200-1280 DEG C in the heating furnace of less oxidizing atmosphere, 5-20 hours is incubated, after coming out of the stove Strand removes iron scale through high-pressure water descaling processing high temperature, by breaking down-in roll-mm finishing mill unit is rolled into 170mm round steel, roll 1150-1230 DEG C of the start rolling temperature of system, 900-980 DEG C of finishing temperature.
5)After rolling bar for prevent cracking, 500 DEG C of high temperature above it is offline enter burial pit, slowly cool to less than 180 DEG C Go out to cheat air cooling.
6)The heat-treatment furnace of bar feeding continous way nitrogen protection after slow cooling is subjected to stress relief annealing, steel are in 670- 720 DEG C of insulations, steel are furnace-cooled to 300 DEG C of air coolings of coming out of the stove after insulation.
7)Bar is handled through peeling surface after annealing removes the surface defect that influence steel are used, and carries out surface inspection (Target N-0.3mm)And the detection such as ultrasonic examination (ASTM A388 standards FBH=3.2 mm).
Using round steel material manufacture tool joint product, concrete technology is as follows:Round steel → blanking → jumping-up → punching extruding Shaping → normalizing → roughing → quenching+tempering processing → complete detection (hardness, mechanical property) → finishing → carrying out flaw detection (ultrasonic wave+magnetic) → Surface heat-treatent → phosphatization and preservative treatment → packaging, storage.
The tool joint product comprehensive mechanical property for the material production being made through above-mentioned manufacturing process the results are shown in Table 1.
The 135KSI tool joint properties of product of the material manufacture of 1 embodiment of table 1
The tool joint of ※ material manufactures of the present invention meets the anti-H of 135KSI ranks2S corrodes performance of drill pipe connector specification.
Embodiment 2
The exploitation of oil-gas field that the present embodiment the is related to a diameter of 230mm of Steel Bar, comprising composition and its weight/mass percentage composition: C:0.29%, Si:0.27%, Mn:0.98%, P:0.007%, S:0.002%, Cr:1.37%, Mo:0.86%, V:0.06%, Nb: 0.026%, Ni:0.15 %, Cu:0.13%, Al:0.025%, Ca:0.0024%, surplus is Fe and impurity element.
Smelting, continuous casting, rolling and the annealing process and embodiment 1 of the embodiment are essentially identical(The continuous casting wherein produced Base size is 600mm round billets), main difference is that subsequent production product is different.
Using round steel material manufacture heavy weight drill pipe product, specific production technology is as follows:Round steel-essence rectify-normalizing+quenching+ Tempering-inner circle drilling-cylindrical turning --- complete detection (hardness, mechanical property etc.)-inner circle counterboring hole-ultrasonic wave is visited Wound-finishing(Cutting thread)- packaging and storage.
The heavy weight drill pipe product mechanical property manufactured through above-mentioned technique the results are shown in Table 2.
The 130KSI heavy weight drill pipe mechanical properties of the material manufacture of 2 embodiment of table 2
The heavy weight drill pipe of ※ material manufactures of the present invention meets the anti-H of 130KSI ranks2S corrodes heavy weight drill pipe performance specification.
The petroleum-gas fiedl of present patent application is with the anti-corrosion drilling tool steel of 130KSI, 135KSI rank, the first patent with the applicant The 110KSI rank hydrogen sulfide corrosion resistant oil well drill pipe steel of application is compared, and the intensity rank of its erosion resistant is higher, it is adaptable to oil, The ultra-deep of gas exploitation, acid down-hole equipment materials'use.The 1. 135KSI grade of steel drilling tool products mechanical performance of the application is met:Bend Take intensity 931MPa-1034MPa(135KSI grade of steels), tensile strength >=1000MPa, elongation percentage >=13%, the contraction percentage of area >= 40%, -20 DEG C of low temperature Charpy-V impact power >=42J, total cross-section hardness 302-352HBW;2. 130KSI grade of steels drilling tool product mechanicalness It can meet:Yield strength 897-1069 MPa(130KSI grade of steels), tensile strength >=1000MPa, elongation percentage >=13%, section receipts Shrinkage >=40%, -20 DEG C of low temperature Charpy-V impact power >=54J, total cross-section hardness 302-341HBW.And existing patent application 110KSI rank hydrogen sulfide corrosion resistant oil well drill pipe steel, its drilling tool product mechanical performance is only met:Yield strength >=758MPa (110KSI grade of steels), tensile strength >=862MPa, elongation percentage >=15%, the contraction percentage of area >=35%, room temperature Charpy-V impact power >= 90J, total cross-section hardness≤30HRC.
The material of another present patent application, under the premise of above-mentioned 130KSI, 135KSI grade of steel comprehensive mechanical performance is met, by U.S. State NACE TM0177 standards anti-H 2 S stress corrosion is tested(Detection method A), in saturation H270% name is preloaded in S solution Yield stress(70%SMYS)Under the conditions of 720 hours constantly;And the 110KSI rank hydrogen sulfide corrosion resistant oil wells of existing patent application Drilling tool Steel material, under the premise of above-mentioned 110KSI grade of steels comprehensive mechanical performance is met, in saturation H265% is preloaded in S solution Adopted yield stress(65%SMYS)Under the conditions of 720 hours constantly.
Based on above-mentioned contrast, this patent material has the stronger anticorrosion properties under more high toughness.
In addition to the implementation, present invention additionally comprises have other embodiment, all use equivalent transformation or equivalent replacements The technical scheme that mode is formed, all should fall within the scope of the hereto appended claims.

Claims (6)

1. a kind of oil gas field anti-corrosion drilling tool steel of 130KSI, 135KSI rank, it is characterised in that:The chemical element component of the steel is pressed Mass percent is calculated as C:0.25~0.40%, Si:0.20~0.45%, Mn:0.95~1.50%, Cr:1.35~1.90%, S:≤ 0.002%, P:≤ 0.008%, Mo:0.75~1.30%, Ni:0.10~0.30%, V:0.05~0.25%, Nb:0.010~ 0.050%, Cu:0.10~0.30%, Al:≤ 0.050%, Ca:0.0005~0.0050%, surplus is Fe and inevitably miscellaneous Prime element, product form is round steel.
2. the oil gas field according to claim 1 anti-corrosion drilling tool steel of 130KSI, 135KSI grade of steel, it is characterised in that:The brill Have performance after the drilling tool product heat treatment of steel making to meet:
1. 135KSI grade of steels drilling tool mechanical performance specification:Yield strength:931-1034MPa, tensile strength >=1000MPa, extension Rate >=13%, the contraction percentage of area >=40%, -20 DEG C of low temperature Charpy-V impact power >=42J, total cross-section hardness 302-352HBW;
2. 130KSI grade of steels drilling tool mechanical performance specification:Yield strength:897-1069MPa, tensile strength >=1000MPa, extension Rate >=13%, the contraction percentage of area >=40%, -20 DEG C of low temperature Charpy-V impact power >=54J, total cross-section hardness 302-341HBW.
3. the oil gas field according to claim 1 or 2 anti-corrosion drilling tool steel of 130KSI, 135KSI rank, the drilling tool steel making Drilling tool product heat treatment after performance meet resistance to H2The requirement of S corrosivity:U.S.'s NACE TM0177 standard anti-H 2 S stress corrosions Experiment(Detection method A), in saturation H270% nominal yield stress is preloaded in S solution(70%SMYS)Under the conditions of 720 hours not Fracture.
4. a kind of method of the oil gas field anti-corrosion drilling tool steel of 130KSI, 135KSI rank described in manufacturing claims 1, its feature exists In:Production is smelted for molding mode using continuous casting, raw materials for metallurgy is successively through refining, LF at the beginning of the pretreatment of KR molten iron, electric furnace/converter first Stove refining, the vacuum outgas of VD/RH stoves, continuous casting obtain the rectangle or circle of 300mm × 340mm, 390 × 510mm or ¢ 600mm sizes Shape continuous casting billet, more than 550 DEG C of continuous casting billet enters to cheat slow cooling, temperature retention time more than 60 hours;Continuous casting billet after slow cooling and Shot Blasting 1200~1280 DEG C are heated in weak oxide atmosphere heating furnace, according to strand size difference control heating strand soaking time 5-20 hours;Continuous casting billet after coming out of the stove enter after high-pressure water descaling roughing-in roll-mm finishing mill unit rolled, strand open rolling Temperature is 1150-1230 DEG C, 900-980 DEG C of stocking finishing temperature;
Roll more than 500 DEG C of rear bar to enter to cheat slow cooling, temperature is down to less than 180 DEG C and goes out hole cooling;
Bar after cooling is subjected to offline stress relief annealing, annealing holding temperature is 670~720 DEG C, the bar stove after insulation It is cooled to less than 300 DEG C air coolings of coming out of the stove;Surface of Rod Bar peeling processing meets ultrasonic examination after annealing:ASTM A388 standards FBH= 3.2 mm and surface inspection:Target N-0.3mm;
The qualified bar of flaw detection is heat-treated again after being directly heat-treated or being processed as semi-finished product drilling tool part, and technique is as follows:Normalizing adds Hot temperature is 920~980 DEG C, and time inside furnace is 200~600min, soaking zone temperature control precision:± 10 DEG C, control stove roller Speed is not more than 550mm/min;Quenching temperature is 860~940 DEG C, and time inside furnace is 300~600min, soaking zone temperature control Precision processed:± 8 DEG C, control stove roller speed is not more than 500mm/min, and using quenching ring water quenching, water temperature controls 20-35 DEG C;Tempering Heating-up temperature is 570~650 DEG C, soaking zone temperature control precision:± 5 DEG C, time inside furnace is 400~600min, controls stove Roller speed is not more than 200mm/min, and air cooling or water cooling are to room temperature after coming out of the stove.
5. the oil gas field according to claim 4 manufacture method of the anti-corrosion drilling tool steel of 130KSI, 135KSI rank, its feature It is:Described quench with tempering process is carried out in the roller-bottom type continuous oven of heated by natural gas.
6. the oil gas field according to claim 4 manufacture method of the anti-corrosion drilling tool steel of 130KSI, 135KSI rank, its feature It is:Round steel maximum gauge produced by the present invention is up to 300mm.
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