CN109266816A - A kind of oil drill rocker crossover sub and the method for improving its transverse impact toughness - Google Patents
A kind of oil drill rocker crossover sub and the method for improving its transverse impact toughness Download PDFInfo
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- CN109266816A CN109266816A CN201811214682.0A CN201811214682A CN109266816A CN 109266816 A CN109266816 A CN 109266816A CN 201811214682 A CN201811214682 A CN 201811214682A CN 109266816 A CN109266816 A CN 109266816A
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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Abstract
The present invention relates to a kind of oil drill rocker crossover subs, as mass fraction, its constituent is respectively, C:0.33%-0.36%, Si:0.15%-0.35%, Mn:0.85%-0.95%, P :≤0.013%, S :≤0.007%, Cr:0.95%-1.10%, Mo:0.28-0.33%, Ca :≤0.005%, V:0.03-0.05%, Alt:0.015~0.040%, N :≤0.008%, O:< 0.0025%, H:< 0.0002%, Alt/N >=5, RE:0.0005-0.002%, surplus Fe.The method for improving the oil drill rocker crossover sub transverse impact toughness is additionally provided simultaneously improves the uniformity of ingredient in normalizing process by suitable heating temperature.Cooling velocity is increased, pro-eutectoid ferrite, fining ferrite grains size are reduced.The effective full hardening deepness of material is improved using water quenching in quenching process, prevents quenching hardness low and uneven, the deficiencies of there are soft spots.V, Al microalloying are being used in tempering process, the toughness plasticity of material can have both been improved under higher tempering temperature or can guarantee suitable intensity index.
Description
Technical field
The invention belongs to steel product production technical fields, and in particular to a kind of oil drill rocker crossover sub, while also providing
The method for improving the oil drill rocker crossover sub transverse impact toughness.
Background technique
Tool joint is the important tool of jointed rod, the material used for the country the SAE4137 trade mark close to
37CrMnMo.The alternation tensile stress and alternation torsion of drilling tool are born during petroleum drilling and mining.It is the weak link of oil drill rocker,
80% or more drilling rod accident appears in this position, because accident occupies suitable ratio wherein caused by material mechanical performance is insufficient
Weight.The failure mode of tool joint has abrasion, fatigue fracture, stress corrosion etc..Therefore connector steel requires have high intensity, good
Good fatigue resistance, good wearability and welding performance.Joint mechanical performance required by American Petroleum Institute's API standard is
Hardness 285-321HBS, tensile strength are greater than 965MPa, and yield strength is greater than 825MPa, and it is different to guarantee that elongation percentage is greater than 13%
The service performance in region shrinks some also require face and is greater than 54%, and -20 DEG C of side knock function are greater than 54J, and impact of collision function is greater than
69J.According to behaviour in service and the difference of suffered shock loading, pin end only examines impact of collision, female connector both examined it is longitudinal or
Examine side knock.It requires with 200 finished product connectors to appoint and one of them is taken to do destructiveness in fact for one group according to American Petroleum Institute (API)
It tests, cuts impact specimen at box thread head removal 32mm.Just from the point of view of current production and application status, the ballistic work of pin end is examined
It is more satisfied to test result, but the lateral low-temperature impact work of female connector is relatively low, has a great deal of unqualified to cause waste product.
Influence the chemical component because being known as material of steel impact flexibility, condition of heat treatment, smelting process, latent defect,
Processing technology and environment temperature.Ballistic work is very sensitive to the internal structural defects of material, the variation of microscopic structure, as field trash,
Segregation, bubble, underbead crack, steel belt roof bolt brittleness, grain coarsening etc. can all be such that impact toughness value is substantially reduced；The examination of same material
Sample, notch is deeper, more sharp, and indentation, there stress concentration degree is bigger, is more easily deformed and is broken, and ballistic work is smaller, material table
It is higher to reveal the brittleness come.Existing technique is faced with the substandard situation of side knock often.And hardness is unevenly distributed,
There is soft spots in portion.
Based on the above analysis, it is badly in need of a kind of new process and solves the problems, such as that female connector transverse direction low-temperature impact work is relatively low, produce
The product of low cost, high quality.Thus on the basis of keeping existing smeltings, continuous casting, rolling comparative maturity technique, chemistry at
Divide and heat treatment aspect finds reasonable effective solution measure.
Summary of the invention
The purpose of the art of this patent is in view of the deficiencies of the prior art and defect, to provide a kind of oil drill rocker crossover sub
And the method for improving the oil drill rocker crossover sub transverse impact toughness, make cross by ingredient design and the improvement of heat treatment process
Meet standard requirements to impact flexibility.The technical solution of this patent is:
A kind of oil drill rocker crossover sub, as mass fraction, constituent is respectively, C:0.33%-0.36%,
Si:0.15%-0.35%, Mn:0.85%-0.95%, P :≤0.013%, S :≤0.007%, Cr:0.95%-1.10%,
Mo:0.28-0.33%, Ca :≤0.005%, V:0.03-0.05%, Alt:0.015~0.040%, N :≤0.008%, O:<
0.0025%, H:< 0.0002%, Alt/N >=5, RE:0.0005-0.002%, wherein rare earth element component are as follows: 67% Ce
La with 33% is made, surplus Fe.
According to another aspect of the present invention, a kind of side for improving oil drill rocker crossover sub transverse impact toughness is additionally provided
Method includes the following steps,
Step 1: by band saw cutting stock section after mid-frequency induction heating, the round billet after cutting is through four-column hydraulic press punch forming
Enter roller hearth type heating furnace afterwards and carry out normalized treatment, normalizing uses 920-950 DEG C of heat preservation 150-200min, extends soaking time and comes
Improve the uniformity of ingredient.Air cools down 10-20s after coming out of the stove, and increases cooling velocity, with land surface pyrometer real-time measurement,
800-650 DEG C of section or so carries out misting cooling, finally air-cooled to prevent crackle from generating, until being down to room temperature.
Step 2: the blank after normalizing carries out the roughing on surface and thread jacket by numerically-controlled machine tool and lathe drilling is beaten
Logical internal diameter.Modifier treatment is carried out through well formula glowing furnace using after the finishing cold breakdown molding of screw thread.Quenching temperature 860-
880 DEG C, 100-120min is kept the temperature, puts into the quenching pond that water temperature is 35 DEG C -45 DEG C and quenches, water cooling 10-15min, during which
It is stirred continuously.
Step 3: quenched joint of petroleum drill rod stands 1 hour, is then placed in tempering furnace, 630-660 DEG C of furnace temperature, protects
Warm 120-150min comes out of the stove after air-cooled 10-15min, puts into sink and is cooled to room temperature.
Finished product after heat treatment is super through four point hardness of HBE-3000A type electricity Zi Bushi Durometer measurements outer diameter, and online
Using the life for both having completed entire finished product connector sleeve after anti-thread gluing of thread surface copper facing etc. reason after sonic flaw detection and magnetic powder inspection
Production. art.
The technical program advantage is as follows:
1) by the adjustment to ingredient, using low carbon content, manganese, chromium content are reduced, reduces carbon and alloying element
Degree of segregation.Using V, Al microalloy treatment technology, strengthen matrix, strengthen grain-boundary strength, improves resistance to tempering, refinement
Grain structure controls grain size number >=5 grade.On the basis of original hello CaSi denaturation treatments, by being added in steel
Rare earth element further enhances sulphide inculsion nodularization effect；Nonmetallic inclusionsin steel A class, B class, C class and four class of D class are pressed from both sides
The control of sundries rank summation is at 5 grades hereinafter, can also purify crystal boundary simultaneously.
2) soaking time is extended to improve the uniformity of ingredient by suitable heating temperature in normalizing process.It increases cold
But speed improves degree of supercooling, reduces pro-eutectoid ferrite, so that pearlite piece spacing is become smaller, thus fining ferrite grains size.
3) in quenching process, the effective full hardening deepness of material is improved using water quenching, prevents quenching hardness low and uneven, there are soft
The deficiencies of point.
4) in tempering process, on the basis of improving matrix strength using V, Al microalloying, while resistance to tempering is improved,
The toughness plasticity of material can have both been improved under higher tempering temperature or can guarantee suitable intensity index.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
A kind of oil drill rocker crossover sub is present embodiments provided, specific ingredient is following (mass fraction, %):
C:0.35；Si:0.24；Mn:0.88；P:0.011%, S:0.003%, Cr:1.04%, Mo:0.31%, Ca:
0.0019%, V:0.045%, Alt:0.025%, N:0.0036%, O:0.0018%, H:0.00012%, RE:0.0009%,
Surplus is Fe.
Part to be processed is female connector, outer diameter 172mm, internal diameter 86mm, to improve the oil drill rocker crossover sub side knock
Toughness, specific heat treatment process are as follows:
1, normalizing process:
By band saw cutting stock section after mid-frequency induction heating, the round billet after cutting enters after four-column hydraulic press punch forming
Roller hearth type heating furnace carries out normalized treatment, and normalizing uses 940 DEG C of heat preservation 180min, extends soaking time to improve the uniform of ingredient
Property.Air cools down 12s after coming out of the stove, and is cooled to 640 DEG C of skies in 790 DEG C or so progress misting coolings with land surface pyrometer real-time measurement
It is cold to prevent crackle from generating, until being down to room temperature.
2, quenching technical:
Blank after normalizing carries out the roughing on surface and thread jacket by numerically-controlled machine tool and internal diameter is got through in lathe drilling.
Modifier treatment is carried out through well formula glowing furnace using after the finishing cold breakdown molding of screw thread.865 DEG C of quenching temperature, heat preservation
115min puts into the quenching pond that water temperature is 42 DEG C and quenches, during which water cooling 15min is stirred continuously.
3, tempering process:
Quenched joint of petroleum drill rod stands 1 hour, is then placed in tempering furnace, 640 DEG C of furnace temperature, and heat preservation 140min goes out
After the air-cooled 10min of furnace, puts into sink and be cooled to room temperature.
4, final result:
Impact test is respectively done in the outside of sample position, centre, inside, it is desirable that KV2 transverse direction >=54J at -20 DEG C, it is longitudinal
≥69J.Wherein longitudinal result is 112J, 114J, 110J, and lateral result is 98J, 97J, 102J.Four point hardness of outer diameter is
302HBW, 299HBW, 310HBW, 303HBW (it is required that hardness number is HBW293-331).
Embodiment 2
A kind of oil drill rocker crossover sub is present embodiments provided, specific ingredient is following (mass fraction, %):
C:0.34；Si:0.27；Mn:0.89；P:0.010%, S:0.004%, Cr:1.06%, Mo:0.32%, Ca:
0.0012%, V:0.040%, Alt:0.033%, N:0.0038%, O:0.0019%, H:0.00015%, RE:0.0011%,
Surplus is Fe.
Part to be processed is pin end, outer diameter 172mm, internal diameter 78mm, to improve the oil drill rocker crossover sub side knock
Toughness, specific heat treatment process are as follows:
1, normalizing process:
By band saw cutting stock section after mid-frequency induction heating, the round billet after cutting enters after four-column hydraulic press punch forming
Roller hearth type heating furnace carries out normalized treatment, and normalizing uses 935 DEG C of heat preservation 190min, extends soaking time to improve the uniform of ingredient
Property.Air cools down 15s after coming out of the stove, and is cooled to 630 DEG C of skies in 780 DEG C or so progress misting coolings with land surface pyrometer real-time measurement
It is cold to prevent crackle from generating, until being down to room temperature.
2, quenching technical:
Blank after normalizing carries out the roughing on surface and thread jacket by numerically-controlled machine tool and internal diameter is got through in lathe drilling.
Modifier treatment is carried out through well formula glowing furnace using after the finishing cold breakdown molding of screw thread.870 DEG C of quenching temperature, heat preservation
110min puts into the quenching pond that water temperature is 38 DEG C and quenches, during which water cooling 12min is stirred continuously.
3, tempering process:
Quenched joint of petroleum drill rod stands 1 hour, is then placed in tempering furnace, 630 DEG C of furnace temperature, and heat preservation 150min goes out
After the air-cooled 10min of furnace, puts into sink and be cooled to room temperature.
4, final result:
Impact test is respectively done in the outside of sample position, centre, inside, it is desirable that KV2 transverse direction >=54J at -20 DEG C, it is longitudinal
≥69J.Wherein longitudinal result is 104J, 106J, 109J, and lateral result is 90J, 96J, 95J.Four point hardness of outer diameter is
318HBW, 309HBW, 315HBW, 310HBW (it is required that hardness number is HBW293-331).
Embodiment 3:
The specific ingredient of drill stem conversion connector is following (mass fraction, %) in the present embodiment:
C:0.33；Si:0.35；Mn:0.85；P:0.013%, S:0.005%, Cr:0.95%, Mo:0.28%, Ca:
0.0022%, V:0.03%, Alt:0.040%, N:0.008%, O:0.0014%, H:0.00015%, RE:0.0011%, it is remaining
Amount is Fe.
Part to be processed is female connector, outer diameter 172mm, internal diameter 86mm, to improve the oil drill rocker crossover sub side knock
Toughness, specific heat treatment process of the invention are as follows:
1, normalizing process:
By band saw cutting stock section after mid-frequency induction heating, the round billet after cutting enters after four-column hydraulic press punch forming
Roller hearth type heating furnace carries out normalized treatment, and normalizing uses 930 DEG C of heat preservation 175min, extends soaking time to improve the uniform of ingredient
Property.Air cools down 15s after coming out of the stove, and is cooled to 660 DEG C of skies in 790 DEG C or so progress misting coolings with land surface pyrometer real-time measurement
It is cold to prevent crackle from generating, until being down to room temperature.
2, quenching technical:
Blank after normalizing carries out the roughing on surface and thread jacket by numerically-controlled machine tool and internal diameter is got through in lathe drilling.
Modifier treatment is carried out through well formula glowing furnace using after the finishing cold breakdown molding of screw thread.860 DEG C of quenching temperature, heat preservation
124min puts into the quenching pond that water temperature is 40 DEG C and quenches, during which water cooling 14min is stirred continuously.
3, tempering process:
Quenched joint of petroleum drill rod stands 1 hour, is then placed in tempering furnace, 645 DEG C of furnace temperature, and heat preservation 142min goes out
After the air-cooled 13min of furnace, puts into sink and be cooled to room temperature.
4, final result:
Impact test is respectively done in the outside of sample position, centre, inside, it is desirable that KV2 transverse direction >=54J at -20 DEG C, it is longitudinal
≥69J.Wherein longitudinal result is 106J, 115J, 108J, and lateral result is 95J, 101J, 96J.Four point hardness of outer diameter is
311HBW, 299HBW, 295HBW, 305HBW (it is required that hardness number is HBW293-331).
Embodiment 4:
The specific ingredient of drill stem conversion connector is following (mass fraction, %) in the present embodiment:
C:0.36；Si:0.15；Mn:0.95；P:0.012%, S:0.007%, Cr:1.10%, Mo:0.33%, Ca:
0.005%, V:0.05%, Alt:0.015%, N:0.003%, O:0.00116%, H:0.00013%, RE:0.0013%, it is remaining
Amount is Fe.
Part to be processed is pin end, outer diameter 172mm, internal diameter 78mm, to improve the oil drill rocker crossover sub side knock
Toughness, specific heat treatment process of the invention are as follows:
1, normalizing process:
By band saw cutting stock section after mid-frequency induction heating, the round billet after cutting enters after four-column hydraulic press punch forming
Roller hearth type heating furnace carries out normalized treatment, and normalizing uses 925 DEG C of heat preservation 180min, extends soaking time to improve the uniform of ingredient
Property.Air cools down 17s after coming out of the stove, and is cooled to 635 DEG C of skies in 760 DEG C or so progress misting coolings with land surface pyrometer real-time measurement
It is cold to prevent crackle from generating, until being down to room temperature.
2, quenching technical:
Blank after normalizing carries out the roughing on surface and thread jacket by numerically-controlled machine tool and internal diameter is got through in lathe drilling.
Modifier treatment is carried out through well formula glowing furnace using after the finishing cold breakdown molding of screw thread.870 DEG C of quenching temperature, heat preservation
115min puts into the quenching pond that water temperature is 40 DEG C and quenches, during which water cooling 11min is stirred continuously.
3, tempering process:
Quenched joint of petroleum drill rod stands 1 hour, is then placed in tempering furnace, 650 DEG C of furnace temperature, and heat preservation 135min goes out
After the air-cooled 13min of furnace, puts into sink and be cooled to room temperature.
4, final result:
Impact test is respectively done in the outside of sample position, centre, inside, it is desirable that KV2 transverse direction >=54J at -20 DEG C, it is longitudinal
≥69J.Wherein longitudinal result is 106J, 114J, 110J, and lateral result is 96J, 105J, 97J.Four point hardness of outer diameter is
311HBW, 316HBW, 308HBW, 313HBW (it is required that hardness number is HBW293-331).
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. a kind of oil drill rocker crossover sub, it is characterised in that: as mass fraction, constituent is respectively C:0.33%-
0.36%, Si:0.15%-0.35%, Mn:0.85%-0.95%, P :≤0.013%, S :≤0.007%, Cr:0.95%-
1.10%, Mo:0.28-0.33%, Ca :≤0.005%, V:0.03-0.05%, Alt:0.015~0.040%, N :≤
0.008%, O:< 0.0025%, H:< 0.0002%, rare earth elements RE: 0.0005-0.002%, surplus Fe.
2. a kind of oil drill rocker crossover sub as described in claim 1, it is characterised in that: the specific following (quality point of ingredient
Number, %): C:0.35；Si:0.24；Mn:0.88；P:0.011%, S:0.003%, Cr:1.04%, Mo:0.31%, Ca:
0.0019%, V:0.045%, Alt:0.025%, N:0.0036%, O:0.0018%, H:0.00012%, RE:0.0009%,
Surplus is Fe.
3. a kind of oil drill rocker crossover sub as described in claim 1, it is characterised in that: the specific following (quality point of ingredient
Number, %), C:0.34；Si:0.27；Mn:0.89；P:0.010%, S:0.004%, Cr:1.06%, Mo:0.32%, Ca:
0.0012%, V:0.040%, Alt:0.033%, N:0.0038%, O:0.0019%, H:0.00015%, RE:0.0011%,
Surplus is Fe.
4. a kind of oil drill rocker crossover sub as described in claim 1, it is characterised in that: the rare earth element group is divided into
67% Ce and 33% La are made.
5. a kind of oil drill rocker crossover sub as described in claim 1, it is characterised in that: Alt/N >=5.
6. a kind of method for improving oil drill rocker crossover sub transverse impact toughness, it is characterised in that: include the following steps,
Step 1: by band saw cutting stock section after mid-frequency induction heating, adding after the stamped molding of round billet after cutting into roller-bottom type
Hot stove carries out normalized treatment, and normalizing uses 920-950 DEG C of heat preservation 150-200min, and air cools down 10-20s after coming out of the stove, with surface
Thermometer real-time measurement carries out misting cooling in 800-650 DEG C of section or so, finally air-cooled to be down to room temperature；
Step 2: the blank after normalizing carries out the roughing on surface and thread jacket and internal diameter is got through in lathe drilling, using spiral shell
Modifier treatment is carried out through well formula glowing furnace after the finishing cold breakdown molding of line, 860-880 DEG C of quenching temperature, keeps the temperature 100-
120min puts into the quenching pond that water temperature is 35 DEG C -45 DEG C and quenches, during which water cooling 10-15min is stirred continuously；
Step 3: quenched joint of petroleum drill rod stands 1 hour, is then placed in tempering furnace, 630-660 DEG C of furnace temperature, heat preservation
120-150min comes out of the stove after air-cooled 10-15min, puts into sink and is cooled to room temperature.
Priority Applications (1)
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| CN110484703A (en) * | 2019-08-30 | 2019-11-22 | 辽宁福鞍重工股份有限公司 | The heat treatment process of the thick big section Mo ultralow-carbon martensitic steel-casting grain size of refinement |
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| CN109266816B (en) | 2021-01-15 |
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