CN108642372A - Steel pipe, its raw material, its production method and rotary drilling rig drilling rod - Google Patents

Steel pipe, its raw material, its production method and rotary drilling rig drilling rod Download PDF

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Publication number
CN108642372A
CN108642372A CN201810260019.8A CN201810260019A CN108642372A CN 108642372 A CN108642372 A CN 108642372A CN 201810260019 A CN201810260019 A CN 201810260019A CN 108642372 A CN108642372 A CN 108642372A
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Prior art keywords
pipe
steel pipe
raw material
mentioned
production method
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Inventor
宋光鑫
赵勤
李卫红
赵映辉
王浩东
肖鸿光
周勇
王世明
闵杰
龚文运
陈红治
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HENGYANG HUALING CONTINOUS ROLLED PIPE CO Ltd
Hengyang Valin Steel Tube Co Ltd
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HENGYANG HUALING CONTINOUS ROLLED PIPE CO Ltd
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Priority to CN201810260019.8A priority Critical patent/CN108642372A/en
Publication of CN108642372A publication Critical patent/CN108642372A/en
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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
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • C21D1/25Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/32Ferrous alloys, e.g. steel alloys containing chromium with boron
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Materials Engineering (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
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  • Mining & Mineral Resources (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

This application provides a kind of steel pipe, its raw material, its production method and rotary drilling rig drilling rods.In percentage by weight, the raw material of the steel pipe includes 0.22~0.30% C, 0.15~0.35% Si, 0.38~0.58% Mn, 0.95~1.10% Cr:0.45~0.50% Mo, the P less than or equal to 0.015%, the S less than or equal to 0.003%, 0.035~0.050% Nb, 0.005~0.025% Ti, 0.010~0.040% Al and 0.0005~0.0030% B, remaining be Fe and inevitable impurity.The steel pipe that the raw material of the steel pipe is formed has certain yield strength, preferable welding performance and higher impact flexibility.The yield strength for the steel pipe that the raw material is formed can reach 850MPa or more.

Description

Steel pipe, its raw material, its production method and rotary drilling rig drilling rod
Technical field
This application involves steel pipe fields, in particular to a kind of steel pipe, its raw material, its production method and churning driven Machine drilling rod.
Background technology
Rotary drilling rig is a kind of construction machinery of pore-forming operation in suitable building foundation engineering, is primarily adapted for sand, viscosity The soil layers such as soil and slity soil are constructed, in a variety of foundation basic constructions such as building construction, bored concrete pile, diaphragm wall and strengthening of foundation It is used widely.
Rotary drilling rig is with characteristics such as its high efficiency and low stains, oneself becomes domestic and international heavy construction, railway and height at present The main construction equipment of fast Road Bridge Pile Foundation plinth construction.And with the increasing of national basis construction investment, the need of rotary drilling rig The amount of asking is increased sharply.
The rotary drilling rig critical component that drilling rod is rotary drilling rig, rotary drilling rig drilling rod is by several sections of various outer diameters and wall thickness Steel pipe nesting be composed, often save drilling rod be made of seamless steel pipe and the inside and outside drive key being welded thereon.
But the intensity of the seamless steel pipe of common rotary drilling rig drilling rod is relatively low at present or toughness is poor, leads to it Cannot meet the needs of high intensity drilling.
Invention content
The main purpose of the application is to provide a kind of steel pipe, its raw material, its production method and rotary drilling rig drilling rod, To solve the problems, such as that steel pipe yield strength in the prior art is relatively low.
To achieve the goals above, according to the one side of the application, a kind of raw material of steel pipe is provided, according to weight hundred Point than meter, the raw material of the steel pipe include 0.24~0.30% C, 0.15~0.35% Si, 0.38~0.58% Mn, 0.95 ~1.10% Cr:, 0.45~0.50% Mo, the P less than or equal to 0.015%, the S less than or equal to 0.003%, 0.035~0.050% Nb, 0.005~0.025% Ti, 0.010~0.040% Al and 0.0005~0.0030% B, remaining be Fe and inevitable impurity.
Further, in the raw material of above-mentioned steel pipe, C equivalent≤0.70%.
To achieve the goals above, according to the one side of the application, a kind of production method of steel pipe, the making are provided Method includes:Step S1 is smelted to obtain blank to the raw material of above-mentioned steel pipe;Step S2 heats above-mentioned blank And perforate, obtain hollow billet;Step S3 carries out tube rolling to above-mentioned hollow billet, obtains hot-rolled pipe;Step S4 carries out above-mentioned hot-rolled pipe Thermal expansion processing and Tempering and Quenching, obtain fished pipe.
Further, above-mentioned steps S2 includes:Step S21 obtains hot base to above-mentioned blank heating;Step S22, to upper Hot base is stated into eleven punch 11, obtains above-mentioned hollow billet.
Further, above-mentioned steps S4 includes:Thermal expansion is carried out to above-mentioned hot-rolled pipe, obtains pre- pipe;To above-mentioned pre- pipe Tempering and Quenching is carried out, above-mentioned fished pipe is obtained.
Further, include to the process of above-mentioned pre- pipe progress Tempering and Quenching:Step A1, at 920~940 DEG C, Above-mentioned pre- pipe is heated, 10~30min postcoolings are kept the temperature;Step A2 carries out water cooling to the above-mentioned pre- pipe after heating Quenching;Step A3 is tempered the above-mentioned pre- pipe after water hardening at 570~610 DEG C, keeps the temperature 40~90min, obtains To above-mentioned fished pipe.
Further, after above-mentioned steps S4, above-mentioned production method further includes:Online heat is carried out to above-mentioned fished pipe Sizing, the temperature of preferably above-mentioned online hot size is between 500~650 DEG C.
According to the application's in another aspect, providing a kind of steel pipe, in percentage by weight, the steel pipe include 0.24~ 0.30% C, 0.15~0.35% Si, 0.38~0.58% Mn, 0.95~1.10% Cr:, 0.45~0.50% Mo, the P less than or equal to 0.015%, the S less than or equal to 0.003%, 0.035~0.050% Nb, 0.005~ The B of 0.025% Ti, 0.010~0.040% Al and 0.0005~0.0030%, remaining is for Fe and inevitably Impurity.
Further, in above-mentioned steel pipe, C equivalent≤0.70%.
According to the another aspect of the application, a kind of rotary drilling rig drilling rod is provided, which includes steel Pipe, above-mentioned steel pipe are any above-mentioned steel pipe or the steel pipe that any above-mentioned production method obtains.
Using the technical solution of the application, in the raw material of the steel pipe, the content of C is controlled between 0.24~0.30%, is protected The steel pipe that card is formed has certain yield strength, while can guarantee it with preferable welding performance again;Control the content of Mn Between 0.38~0.58% so that Mn preferably plays solution strengthening effect, to further increase the yield strength of steel pipe, fits Amount addition Mo and Cr, can be in the quenching degree for the same raising steel for playing solution strengthening effect;Al is added in smelting process makees deoxidier, Ti and Al can crystal grain thinning;A small amount of addition Nb and B increases the quenching degree of steel;Less P and S can reduce the field trash in steel, carry The degree of purity of Gao Gang further increases the toughness of steel.The raw material formed steel pipe yield strength can reach 850MPa and with On.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.In the accompanying drawings:
Fig. 1 shows the flow diagram of the production method of the steel pipe of the application.
Specific implementation mode
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
As background technology is introduced, the yield strength of steel pipe in the prior art is relatively low or toughness is poor, in order to Technical problem as above is solved, present applicant proposes a kind of steel pipe, its raw material, its production method and rotary drilling rig drilling rods.
In a kind of typical embodiment of the application, a kind of raw material of steel pipe is provided, it in percentage by weight, should The raw material of steel pipe include 0.24~0.30% C, 0.15~0.35% Si, 0.38~0.58% Mn, 0.95~1.10% Cr, 0.45~0.50% Mo, the P less than or equal to 0.015%, the S less than or equal to 0.003%, 0.035~ 0.050% Nb, 0.005~0.025% Ti, 0.010~0.040% Al and 0.0005~0.0030% B, remaining It is Fe and inevitable impurity.
In the raw material of the steel pipe, the content of C is controlled between 0.24~0.30%, ensures that the steel pipe to be formed has centainly Yield strength, while can guarantee it with preferable welding performance again;The content of Mn is controlled between 0.38~0.58% so that Mn preferably plays solution strengthening effect, appropriate to add Mo and Cr to further increase the yield strength of steel pipe, can play solid solution The quenching degree of the same raising steel of invigoration effect;Al is added in smelting process makees deoxidier, and Ti and Al can crystal grain thinnings;Add on a small quantity Nb and B is added to increase the quenching degree of steel;Less P and S can reduce the field trash in steel, improve the degree of purity of steel, further increase The toughness of steel.The yield strength for the steel pipe that the raw material is formed can reach 850MPa or more.
In a kind of embodiment of the application, C equivalent≤0.70% in the raw material of steel pipe is controlled.It can ensure that steel has in this way Preferable intensity, while can guarantee that the calculation formula of C equivalents is CEV=C+ (Mn/6)+[(Cr with preferable welding performance again +Mo+V)/5]+[(Ni+Cu)/15].The percentage composition of corresponding element, works as steel pipe raw material in the raw material of each alphabet steel tube In corresponding element not to be covered when, percentage composition be remnants.
In the typical embodiment of another kind of the application, a kind of production method of steel pipe is provided, as shown in Figure 1, should The production method of steel pipe includes:Step S1 is smelted to obtain blank to the raw material of above-mentioned steel pipe;Step S2, to above-mentioned base Material is heated and is perforated, and hollow billet is obtained;Step S3 carries out tube rolling to above-mentioned hollow billet and obtains hot-rolled pipe;Step S4, to above-mentioned heat Tube rolling carries out thermal expansion processing and Tempering and Quenching, obtains fished pipe, i.e. steel pipe.
The steel pipe of above-mentioned raw material due to being made so that the steel pipe of formation has higher yield strength, to full The application demand of sufficient high intensity.Also, the production method process is simple, and cost is relatively low, and lumber recovery is higher.
In order to further enhance the uniformity and mechanical property of the caliber of obtained hot finished steel pipe, a kind of reality of the application It applies in example, above-mentioned rapid S2 includes:Step S21 obtains hot base to above-mentioned blank heating;Step S22 wears above-mentioned hot base Hole obtains above-mentioned hollow billet.
In the another embodiment of the application, the heating process of above-mentioned steps S21 includes three phases, specially preheats rank Section, heating period and soaking stage.Heating period includes II section of I section of heating and heating, and the soaking stage includes I sections of soaking and equal It is II sections hot.Specifically, the temperature of above-mentioned blank reaches 970~990 DEG C after preheating section heating, after above-mentioned heating I sections heating The temperature of above-mentioned blank reaches 1090~1010 DEG C, after above-mentioned heating II sections heating the temperature of above-mentioned blank reach 1170~ 1190 DEG C, the temperature of above-mentioned blank reaches 1240~1260 DEG C after above-mentioned heating III sections heating, then temperature 1270~ After I sections of 1290 DEG C of soaking and II sections of soaking of soaking, above-mentioned hot base is obtained.By above-mentioned heat stepwise, pipe is made gradually to rise Height arrives soaking temperature, avoids the too fast defect for causing to crack in hot base of heating rate.
Also, the blank in order to further ensure obtaining hot base sufficiently uniformly heats, and ensures that blank heating is kept away simultaneously thoroughly The crystal grain for exempting from long-time heating generation is grown up, in a kind of embodiment in the application, heating time of above-mentioned steps S21 80~ Between 120min.
In order to enable the heating of blank is more uniform, to further avoid occurring heating defect, a kind of reality of the application It applies in example, the time of above-mentioned warm-up phase is 10min~14min, and the time of I sections of heating is 15min~19min, heats II sections Time be 25min~29min, heating III section time be 20min~30min, the time that I of soaking for 20min~ 24min, the time that II of soaking are 10min~14min.
In the another embodiment of the application, above-mentioned steps S3 includes:Above-mentioned hollow billet is rolled, is obtained by step S31 Hollow forging;Step S32 preheat simultaneously sizing or tube reducing to above-mentioned hollow forging, is obtaining hot-rolled pipe, the temperature of preferably above-mentioned preheating is 920~965 DEG C, it can be that subsequent sizing or tube reducing are laid a solid foundation to the preheating of hollow forging, improve treatment effect.
In a kind of embodiment of the application, above-mentioned steps S4 includes:Thermal expansion (i.e. thermal expansion is processed) is carried out to above-mentioned hot-rolled pipe, Obtain pre- pipe;Tempering and Quenching is carried out to above-mentioned pre- pipe, obtains above-mentioned production tube, which can further protect Demonstrate,prove the performance of fished pipe.
In another preferred embodiment of the application, the process for carrying out Tempering and Quenching to above-mentioned pre- pipe includes:Step Rapid A1 heats above-mentioned pre- pipe at 920~940 DEG C, keeps the temperature 10~30min, further ensures steel pipe Austria in this way The uniformity of family name's body, while alloy being made at the uniform velocity to be substantially dissolved in austenite;Step A2, to after heating (due to step A1's Main methods are heating, so after the processing for representing step A1 " after heating " here, and after coming out of the stove) pre- pipe into Row water hardening, to obtain martensitic structure;Step A3, at 570~610 DEG C, to the above-mentioned pre- pipe after water hardening It is tempered, keeps the temperature 40~90min, so that alloying element is fully precipitated from oversaturated solid solution in this way, obtain more Scattered carbide simultaneously makes the tissue after tempering tend to stablize.In the processing procedure, alloys producing is adequately sent out It waves, and then improves the stability of steel duct metallographic structure, improve the plasticity and toughness of seamless steel pipe.
After above-mentioned Tempering and Quenching step, above-mentioned production method can also include online hot size step, preferably on The temperature for stating online hot size is 500~650 DEG C.Sizing after tempering advantageously reduces the deformation in heat treatment process, reduces The ovality of steel pipe.Above-mentioned production method can also include straightening step, and the preferably temperature of straightening step is 450~630 DEG C.It returns Straightening temperature after fire within the above range, advantageously reduces the residual stress generated in straightening process.
In the typical embodiment of another of the application, a kind of steel pipe is provided, in percentage by weight, the steel pipe Including 0.24~0.30% C, 0.15~0.35% Si, 0.38~0.58% Mn, 0.95~1.10% Cr, 0.45~ 0.50% Mo, the P less than or equal to 0.015%, the S less than or equal to 0.003%, 0.035~0.050% Nb, 0.005 The B of~0.025% Ti, 0.010~0.040% Al and 0.0005~0.0030%, remaining is for Fe and unavoidably Impurity.
In the steel pipe, the content of C is controlled between 0.24~0.30%, ensures that the steel pipe to be formed has certain surrender strong Degree, while can guarantee it with preferable welding performance again;The content of Mn is controlled between 0.38~0.58% so that Mn is more preferable Ground plays solution strengthening effect, appropriate to add Mo and Cr to further increase the yield strength of steel pipe, can make playing solution strengthening The quenching degree of same raising steel;Al is added in smelting process makees deoxidier, and Ti and Al can crystal grain thinnings;A small amount of addition Nb and B increases the quenching degree of steel;Less P and S can reduce the field trash in steel, improve the degree of purity of steel, further increase the tough of steel Property.The yield strength for the steel pipe that the raw material is formed can reach 850MPa or more.
In another embodiment of the application, C equivalent≤0.70% in the raw material of steel pipe is controlled.It can ensure steel in this way Have preferable intensity, while can guarantee again with preferable welding performance, the calculation formula of C equivalents be CEV=C+ (Mn/6)+ [(Cr+Mo+V)/5]+[(Ni+Cu)/15].The percentage composition of corresponding element, works as steel pipe in the raw material of each alphabet steel tube In raw material when corresponding element not to be covered, percentage composition is remnants.
In the typical embodiment of another of the application, a kind of rotary drilling rig drilling rod is provided, which includes steel Pipe, the steel pipe are above-mentioned steel pipe or the prepared steel pipe of above-mentioned production method.
The rotary drilling rig drilling rod is due to including above-mentioned steel pipe so that its yield strength is higher, can preferably expire The demand of sufficient high intensity drilling.
In a kind of embodiment, between 100~630mm, wall thickness is more than between 30mm the outer diameter of rotary drilling rig drilling rod.
In order to enable those skilled in the art can clearly understand the technical solution of the application, below with reference to tool The embodiment of body illustrates the technical solution of the application.
Embodiment 1
In percentage by weight, the raw material of steel pipe include 0.24% C, 0.35% Si, 0.38% Mn, 1.10% Cr:, 0.45% Mo, 0.015% P, 0.003% S, 0.035% Nb, 0.025% Ti, 0.010% Al with And 0.0030% B, remaining be Fe and inevitable impurity.C equivalents are 0.5563%.
Specifically the manufacturing process of steel pipe includes:
Step S1 smelts the raw material of steel pipe, obtains blank.
Specifically, raw material obtains blank by electric furnace smelting, external refining, vacuum outgas and arc continuous casting.
Step S2 heats above-mentioned blank, then uses tapered roller into eleven punch 11, obtains hollow billet.
Specifically, first, blank is heated, heating process includes warm-up phase, I sections of heating, II sections of heating, heating II sections of III sections, I sections of soaking and soaking.The time in each stage be respectively 10min, 15min, 25min, 20min, 20min and 10min.Specifically, the temperature of above-mentioned blank reaches 970 DEG C after preheating section heating, the above-mentioned base after I section of heating of above-mentioned heating The temperature of material reaches 1090 DEG C, and the temperature of above-mentioned blank reaches 1170 DEG C after II section of heating of above-mentioned heating, adds by above-mentioned The temperature of above-mentioned blank reaches 1240 DEG C after III section of heating of heat, then in I section of the soaking of 1270 DEG C of temperature and II section of soaking of soaking Afterwards, above-mentioned hot base is obtained.
Above-mentioned hot base is obtained into hollow billet at 1130 DEG C into eleven punch 11.
Step S3 carries out tube rolling to above-mentioned hollow billet, obtains hot-rolled pipe.
Specifically, above-mentioned hollow billet is subjected to tube rolling first with PQF pipe mills, obtains hollow forging;Medium carries out hollow forging pre- Heat and sizing, obtain hot-rolled pipe.
Step S4 carries out thermal expansion processing and Tempering and Quenching to above-mentioned hot-rolled pipe, obtains fished pipe.
Specifically, pre- pipe first is obtained to the heating of above-mentioned hot-rolled pipe and thermal expansion;Above-mentioned pre- pipe is carried out at quenched heat Reason, obtains above-mentioned fished pipe.
The process that Tempering and Quenching is carried out to above-mentioned pre- pipe adds above-mentioned pre- pipe specifically, at 920 DEG C Heat keeps the temperature 30min postcoolings;Water hardening is carried out to the above-mentioned pre- pipe after heating, obtains martensitic structure;At 570 DEG C, Above-mentioned pre- pipe after water hardening is tempered, it is air-cooled after heat preservation 90min, obtain fished pipe.
Step S5 carries out online hot size to above-mentioned fished pipe, and the temperature of preferably above-mentioned online hot size is 500 DEG C.
Embodiment 2
With the difference of embodiment 1, the raw material of steel pipe include 0.30 C, 0.15% Si, 0.58% Mn, 0.95% Cr, 0.50% Mo, 0.011% P, 0.002% S, 0.050% Nb, 0.025% Ti, 0.040% The B of Al and 0.0020%, remaining is Fe and inevitable impurity.C equivalents are 0.5996%.Also, to above-mentioned pre- During pipe progress Tempering and Quenching obtains above-mentioned steel pipe, the temperature of heating is 940 DEG C, soaking time 10min, At 610 DEG C, the above-mentioned pre- pipe after water hardening is tempered, it is air-cooled after heat preservation 40min, obtain fished pipe.
Embodiment 3
With the difference of embodiment 1, the raw material of steel pipe include 0.25% C, 0.21% Si, 0.44% Mn, 1.02% Cr, 0.47% Mo, 0.011% P, 0.002% S, 0.042% Nb, 0.018% Ti, 0.013% The B of Al and 0.0016%, remaining is Fe and inevitable impurity.C equivalents are 0.621%.Also, to above-mentioned pre- pipe Base carries out during being thermally treated resulting in above-mentioned steel pipe, and the temperature of quenching is 930 DEG C, soaking time 15min, at 590 DEG C, Above-mentioned pre- pipe after water hardening is tempered, it is air-cooled after heat preservation 60min, obtain above-mentioned fished pipe (i.e. steel pipe).
Embodiment 4
With embodiment 3 difference lies in:The raw material of steel pipe further includes 0.5% V, and C equivalents are 0.721%.
Embodiment 5
With embodiment 3 difference lies in:During carrying out being thermally treated resulting in above-mentioned fished pipe to above-mentioned pre- pipe, The temperature of heating is 900 DEG C.
Embodiment 6
With embodiment 3 difference lies in:During carrying out being thermally treated resulting in above-mentioned fished pipe to above-mentioned pre- pipe, The soaking time of heating is 8min.
Embodiment 7
With embodiment 3 difference lies in:During carrying out being thermally treated resulting in above-mentioned fished pipe to above-mentioned pre- pipe, The temperature being tempered to the above-mentioned pre- pipe after water hardening is 580 DEG C.
Embodiment 8
With embodiment 3 difference lies in:During carrying out being thermally treated resulting in above-mentioned fished pipe to above-mentioned pre- pipe, The soaking time being tempered to the above-mentioned pre- pipe after water hardening is 30min.
Embodiment 9
With embodiment 3 difference lies in:The temperature of online hot size is 480 DEG C.
Comparative example 1
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.1% C, and the content of Fe changes correspondingly.
Comparative example 2
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.60% Si, and the content of Fe changes correspondingly.
Comparative example 3
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.8% Mn, and the content of Fe changes correspondingly.
Comparative example 4
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.04% P, and the content of Fe changes correspondingly.
Comparative example 5
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.03% S, and the content of Fe changes correspondingly.
Comparative example 6
With embodiment 3 difference lies in:The raw material of steel pipe includes 1.30% Cr, and the content of Fe changes correspondingly.
Comparative example 7
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.70% Mo, and the content of Fe changes correspondingly.
Comparative example 8
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.080% Nb, and the content of Fe changes correspondingly.
Comparative example 9
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.06% Ti, and the content of Fe changes correspondingly.
Comparative example 10
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.06% Al, and the content of Fe changes correspondingly.
Comparative example 11
With embodiment 3 difference lies in:The raw material of steel pipe includes 0.01% B, and the content of Fe changes correspondingly.
According to《The standard method and definition of steel product mechanical property test》Specified in method to embodiment and comparison The seamless steel pipe of example carries out tension test and impact test, test result are shown in Table 1.
Table 1
By the data in above-mentioned table 1 it is found that when steel pipe raw material include 0.24~0.30% C, 0.15~0.35% Si, 0.38~0.58% Mn, 0.95~1.10% Cr:, 0.45~0.50% Mo, the P less than or equal to 0.015%, S, 0.035~0.050% Nb, 0.005~0.025% Ti less than or equal to 0.003%, 0.010~0.040% Al And 0.0005~0.0030% B when;And during the Tempering and Quenching of manufacturing process, at 920~940 DEG C, to above-mentioned Pre- pipe is heated, and 10~30min postcoolings are kept the temperature;Water hardening is carried out to the above-mentioned pre- pipe after heating;570~ At 610 DEG C, the above-mentioned pre- pipe after water hardening is tempered, keeps the temperature 40~90min;Also, the temperature of online hot size When between 500~650 DEG C, the tensile strength of prepared steel pipe, yield strength, the contraction percentage of area, elongation percentage, hardness with And the better performances such as room temperature impact of collision.
It can be seen from the above description that the application the above embodiments realize following technique effect:
1), in the raw material of the steel pipe of the application, the content of C is controlled between 0.24~0.30%, ensures the steel pipe to be formed With certain yield strength, while it can guarantee it with preferable welding performance again;Control the content of Mn 0.38~ Between 0.58% so that Mn preferably plays solution strengthening effect, to further increase the yield strength of steel pipe, adds Mo in right amount And Cr, it can be in the quenching degree for the same raising steel for playing solution strengthening effect;Al is added in smelting process makees deoxidier, and Ti and Al can Crystal grain thinning;A small amount of addition Nb and B increases the quenching degree of steel;Less P and S can reduce the field trash in steel, improve the pure of steel Cleanliness further increases the toughness of steel.The yield strength for the steel pipe that the raw material is formed can reach 850MPa or more.
2), the production method of the steel pipe of the application so that the steel pipe of formation has higher yield strength, to meet height The application demand of intensity.Also, the production method process is simple, and cost is relatively low, and lumber recovery is higher.
3), in the steel pipe of the application, the content of C is controlled between 0.24~0.30%, ensures that the steel pipe to be formed has one Fixed yield strength, while can guarantee it with preferable welding performance again;The content of Mn is controlled between 0.38~0.58%, So that Mn preferably plays solution strengthening effect, and it is appropriate to add Mo and Cr to further increase the yield strength of steel pipe, it can rise The quenching degree of the same raising steel of solution strengthening effect;Al is added in smelting process makees deoxidier, and Ti and Al can crystal grain thinnings;It is few Amount addition Nb and B increases the quenching degree of steel so that there is steel higher impact flexibility, room temperature impact of collision can reach 63J or more; Less P and S can reduce the field trash in steel, improve the degree of purity of steel, further increase the toughness of steel.The steel that the raw material is formed The yield strength of pipe can reach 850MPa or more.
4), the rotary drilling rig drilling rod of the application is due to including above-mentioned steel pipe so that its yield strength is higher, can Preferably meets the needs of high intensity drilling, while impact flexibility height makes drilling rod be not easy to form fatigue fracture.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.

Claims (10)

1. a kind of raw material of steel pipe, which is characterized in that in percentage by weight, the raw material of the steel pipe includes 0.24~ 0.30% C, 0.15~0.35% Si, 0.38~0.58% Mn, 0.95~1.10% Cr:, 0.45~0.50% Mo, the P less than or equal to 0.015%, the S less than or equal to 0.003%, 0.035~0.050% Nb, 0.005~ The B of 0.025% Ti, 0.010~0.040% Al and 0.0005~0.0030%, remaining is for Fe and inevitably Impurity.
2. the raw material of steel pipe according to claim 1, which is characterized in that in the raw material of the steel pipe, C equivalents≤ 0.70%.
3. a kind of production method of steel pipe, which is characterized in that the production method includes:
Step S1 is smelted to obtain blank to the raw material of steel pipe as claimed in claim 1 or 2;
Step S2 is heated and is perforated to the blank, obtains hollow billet;
Step S3 carries out tube rolling to the hollow billet, obtains hot-rolled pipe;And
Step S4 carries out thermal expansion processing and Tempering and Quenching to the hot-rolled pipe, obtains fished pipe.
4. production method according to claim 3, which is characterized in that the step S2 includes:
Step S21 obtains hot base to the blank heating;And
Step S22 obtains the hollow billet to the hot base into eleven punch 11.
5. production method according to claim 3, which is characterized in that the step S4 includes:
Thermal expansion is carried out to the hot-rolled pipe, obtains pre- pipe;And
Tempering and Quenching is carried out to the pre- pipe, obtains the fished pipe.
6. production method according to claim 5, which is characterized in that carry out the process of Tempering and Quenching to the pre- pipe Including:
Step A1 heats the pre- pipe at 920~940 DEG C, keeps the temperature 10~30min postcoolings;
Step A2 carries out water hardening to the pre- pipe after heating;And
Step A3 is tempered the pre- pipe after water hardening at 570~610 DEG C, keeps the temperature 40~90min, obtains The fished pipe.
7. production method according to claim 5, which is characterized in that after the step S4, the production method is also Including:
Online hot size is carried out to the fished pipe, the temperature of the preferably described online hot size is between 500~650 DEG C.
8. a kind of steel pipe, which is characterized in that in percentage by weight, the steel pipe include 0.24~0.30% C, 0.15~ 0.35% Si, 0.38~0.58% Mn, 0.95~1.10% Cr:, 0.45~0.50% Mo, be less than or equal to 0.015% P, the S less than or equal to 0.003%, 0.035~0.050% Nb, 0.005~0.025% Ti, 0.010~ 0.040% Al and 0.0005~0.0030% B, remaining is Fe and inevitable impurity.
9. steel pipe according to claim 8, which is characterized in that in the steel pipe, C equivalent≤0.70%.
10. a kind of rotary drilling rig drilling rod, including steel pipe, which is characterized in that the steel pipe is the steel described in claim 8 or 9 The steel pipe that production method described in any one of pipe or claim 3 to 7 obtains.
CN201810260019.8A 2018-03-27 2018-03-27 Steel pipe, its raw material, its production method and rotary drilling rig drilling rod Pending CN108642372A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1950532A (en) * 2004-05-07 2007-04-18 住友金属工业株式会社 Seamless steel pipe and method for production thereof
CN104946975A (en) * 2015-07-13 2015-09-30 攀钢集团成都钢钒有限公司 Raw material steel of seamless steel pipe for drill pipe of rotary drilling rig and smelting method of raw material steel
CN104975224A (en) * 2010-03-04 2015-10-14 株式会社神户制钢所 Seamless steel pipe of high-strength hollow spring
CN106191656A (en) * 2016-08-17 2016-12-07 衡阳华菱连轧管有限公司 A kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1950532A (en) * 2004-05-07 2007-04-18 住友金属工业株式会社 Seamless steel pipe and method for production thereof
CN104975224A (en) * 2010-03-04 2015-10-14 株式会社神户制钢所 Seamless steel pipe of high-strength hollow spring
CN104946975A (en) * 2015-07-13 2015-09-30 攀钢集团成都钢钒有限公司 Raw material steel of seamless steel pipe for drill pipe of rotary drilling rig and smelting method of raw material steel
CN106191656A (en) * 2016-08-17 2016-12-07 衡阳华菱连轧管有限公司 A kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application

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Application publication date: 20181012