CN106282785A - A kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel - Google Patents
A kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel Download PDFInfo
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- CN106282785A CN106282785A CN201610956511.XA CN201610956511A CN106282785A CN 106282785 A CN106282785 A CN 106282785A CN 201610956511 A CN201610956511 A CN 201610956511A CN 106282785 A CN106282785 A CN 106282785A
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- Prior art keywords
- drill string
- titanium
- steel
- niobium
- boron
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Classifications
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
Abstract
The invention provides a kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel, composition containing following percentage by weight: C 0.35 0.42%, Si 0.15 0.35%, Mn0.70 1.00%, P≤0.030%, S≤0.025%, Cr 0.85 1.20%, Ni 0.08 0.15%, Mo 0.15 0.27%, Nb 0.01 0.038%, B 0.0005 0.0035%, Ti 0.006 0.020%, remaining is ferrum and inevitable impurity element.Compared with prior art, by adjusting the percentage ratio of element in the present invention, on the premise of ensureing adapter product quality, desirable fire or the normalizing process of disappearing, thus the energy can be saved, reduce production cost.It is additionally, since and adds boron, so the content of precious metal molybdenum also can be reduced, saved cost.
Description
Technical field
The invention belongs to structural alloy steel, be specifically related to a kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel.
Background technology
Oil drill string crossover coupling is the class key component in oil drilling tools product, and it in use to bear and hale, by force
The compound actions such as torsion, shock and vibration, rotation, use condition the harshest.Its security reliability requires the highest, it is necessary to have good
Good mechanical property, high quenching degree, higher consistency and purity of steel.
Oil adapter is typically by Unite States Standard 4137H steel making, American Society Testing and Materials's standard ASTM_A29/
In A29M, the chemical composition (percentage by weight) of 4137H steel is: C0.35-0.40%, Si0.15-0.35%, Mn0.70-
0.90%, P≤0.035%, S≤0.040%, Cr0.80-1.10%, Mo0.15-0.25%, remaining is ferrum and impurity element.
At present oil drilling tools maker is when producing adapter, for performance and the matter of the quenching degree and product that ensure steel
Amount, improves Mo content to 0.25-0.40%, and adds the Ni of 0.1-0.15%.The size of adapter, quality are relatively big, peace
Full reliability requirement is the highest, when manufacturing oil drill string crossover coupling, in order to ensure comprehensive mechanical property, and must before Tempering and Quenching
Must carry out annealing or normalizing, so that the material metallographic structure after rolling or forging is uniform, eliminates or partially remove materials microstructure
Uneven phenomenon, the combination property for follow-up Tempering and Quenching and raising steel carries out tissue preparation.
Although carrying out before oil drill string crossover coupling Tempering and Quenching at present annealing or normalizing has improving its combination property
Profit, but production cost can be increased after all, if annealing or normalizing process can be cancelled on the premise of keeping its combination property, then may be used
Save the energy, cost efficiency.
Summary of the invention
It is an object of the invention to provide a kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel, by regulation and control steel
Composition, adds niobium, boron and titanium, improves steel obdurability, on the premise of ensureing adapter product quality, and the desirable fire or just of disappearing
Firer's sequence, thus the energy can be saved, and reduce production cost.
A kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel that the present invention provides, containing following percentage by weight
Composition:
C 0.35-0.42%, Si 0.15-0.35%, Mn 0.70-1.00%, P≤0.030%, S≤0.025%, Cr
0.85-1.20%, Ni 0.08-0.15%, Mo 0.15-0.27%, Nb0.01-0.038%, B 0.0005-0.0035%, Ti
0.006-0.020%, remaining is ferrum and inevitable impurity element.
Preferably, described niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel, containing the one-tenth of following percentage by weight
Point:
C 0.35-0.40%, Si 0.15-0.35%, Mn 0.75-0.95%, P≤0.025%, S≤0.020%, Cr
0.95-1.15%, Ni 0.08-0.15%, Mo 0.18-0.25%, Nb0.012-0.025%, B 0.0008-0.0025%,
Ti 0.008-0.018%, remaining is ferrum and inevitable impurity element.
Preferably, described niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel, containing the one-tenth of following percentage by weight
Point:
C 0.35-0.40%, Si 0.15-0.35%, Mn 0.75-0.95%, P≤0.020%, S≤0.015%, Cr
1.00-1.10%, Ni 0.08-0.15%, Mo 0.18-0.25%, Nb0.015-0.020%, B 0.0008-0.0025%,
Ti 0.010-0.015%, remaining is ferrum and impurity element.
Described niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel the most desirable disappear fire or positive firer
Sequence.
The content of each element and acting as in the present invention:
Carbon is to improve quenching degree and the rigid important element of through hardening in steel, and it is 0.35-that the present invention controls carbon content scope
0.42%, too low, intensity and hardness can be reduced, too high, plasticity and toughness can be reduced, increase workpiece quenching tearing tendency.
Silicon is mainly present in ferrite or austenite with the form of solid solution in steel, can improve the intensity of steel,
Also it is the deoxidant element of steel-making, but content is unsuitable too high, in order to avoid reducing the toughness of steel.Therefore control at 0.15-
0.35%.
Manganese, chromium, molybdenum, nickel are the most all the important elements improving quenching degree, and it is 0.70-that the present invention controls Fe content scope
1.00%, controlling chromium content range is 0.85-1.20%, and controlling molybdenum content scope is 0.1 5-0.27%, controls nickel content model
Enclosing is 0.08-0.15%.
Sulfur, phosphorus are the harmful elements forming field trash in steel, so should be controlled by, the technical program minimum requirements P≤
0.030%, S≤0.025%.
Adding niobium is to control the structural homogenity of steel when rolling or forging, preventing mixed crystal phenomenon, such that it is able to save
Remove annealing or normalizing process.In steel niobium as micro alloying element can by formed carbon, nitride hinder high temperature deformation time
The recrystallization of austenite and restriction crystal grain are grown up so that stocking or forging material obtain uniform and tiny crystal grain.It addition, be solid-solubilized in steel
Niobium can improve the quenching degree of steel, be improved when modifier treatment quenching degree effect.
The effect of boron is: trace B just can be multiplied the quenching degree of steel.For drilling tool steel, increase the through hardening of steel
Property have great importance, drilling tool can be made to obtain higher intensity and toughness by phase transformation strengthening.Cheap boron portion replaces
Expensive element can significantly reduce cost.Boron is mainly in the segregation of austenite grain boundary, and when making austenite decomposition, cenotype is at Ovshinsky
There is difficulty in body grain boundaries forming core, causes the stage of incubation of austenite decomposition to lengthen, and improves quenching degree.And the character of boron is the most alive
Sprinkling, the nitrogen in Yi Yugang forms BN compound, the invalid boron of BN phase, claims sour insoluble boron, do not improve through hardening in chemical analysis
The effect of property.Separately adding B steel crack sensitivity relatively strong, in continuous casting cooling procedure, B with N is combined formation BN, analyses at austenite grain boundary
Going out, easily cause embrittlement of grain boundaries, cause fire check, the oxidized skin of fire check covers and is difficult to be found, and causes and occurs on finished product round steel
Skin defect is stuck up on surface.
Add trace amount of titanium and can fix N in steel so that in steel, the content of effective boron increases, thus more effectively play boron and close
The effect of aurification, improves steel obdurability, meanwhile, the Cracks In Continuous Cast Billets that BN can be avoided to cause, eliminates boron alloyed steel surface and stick up skin
Defect.
Compared with prior art, by adjusting the percentage ratio of element in the present invention, ensureing adapter product quality
Under premise, desirable fire or the normalizing process of disappearing, thus the energy can be saved, reduce production cost.It is additionally, since and adds boron,
So the content of precious metal molybdenum also can be reduced, save cost.
Detailed description of the invention
Technical scheme is further illustrated below in conjunction with embodiment.
The chemical composition of embodiment 1-5 and comparative example 1 is shown in Table 1, and (heat analysis, remaining is Fe and inevitable impurity unit
Element),
Table 1
The mechanical property (by API7-1 standard test) of the drill string crossover coupling that embodiment 1-5 is made with comparative example 1 steel is shown in
Table 2.
Table 2
Embodiment 1-5 compares visible with comparative example 1 respectively, the oil drill string crossover coupling performance that embodiment 1-5 is made with
Ratio 1 suitable, all meets API7-1 standard-required, but embodiment 1-5 is without normalizing or annealing operation, and Technology for Heating Processing is existing
There are technology, embodiment to only have quenched, and ratio 1 is normalizing+quenched, and molybdenum content is relatively low, therefore saved the energy, reduced production
Cost.
Claims (3)
1. a niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel, it is characterised in that described niobium-titanium-boron microalloy fossil
Oil drill string crossover coupling steel contains the composition of following percentage by weight: C 0.35-0.42%, Si 0.15-0.35%, Mn
0.70-1.00%, P≤0.030%, S≤0.025%, Cr 0.85-1.20%, Ni 0.08-0.15%, Mo 0.15-
0.27%, Nb 0.01-0.038%, B 0.0005-0.0035%, Ti 0.006-0.020%, remaining is that ferrum is with inevitable
Impurity element.
Niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel the most according to claim 1, it is characterised in that described niobium
Titanium-boron microalloy fossil oil drill string crossover coupling steel, containing the composition of following percentage by weight:
C 0.35-0.40%, Si 0.15-0.35%, Mn 0.75-0.95%, P≤0.025%, S≤0.020%, Cr
0.95-1.15%, Ni 0.08-0.15%, Mo 0.18-0.25%, Nb 0.012-0.025%, B 0.0008-0.0025%,
Ti 0.008-0.018%, remaining is ferrum and inevitable impurity element.
Niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel the most according to claim 1, it is characterised in that described niobium
Titanium-boron microalloy fossil oil drill string crossover coupling steel, containing the composition of following percentage by weight:
C 0.35-0.40%, Si 0.15-0.35%, Mn 0.75-0.95%, P≤0.020%, S≤0.015%, Cr
1.00-1.10%, Ni 0.08-0.15%, Mo 0.18-0.25%, Nb 0.015-0.020%, B 0.0008-0.0025%,
Ti 0.010-0.015%, remaining is ferrum and impurity element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610956511.XA CN106282785A (en) | 2016-10-27 | 2016-10-27 | A kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610956511.XA CN106282785A (en) | 2016-10-27 | 2016-10-27 | A kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel |
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| CN106282785A true CN106282785A (en) | 2017-01-04 |
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| CN201610956511.XA Pending CN106282785A (en) | 2016-10-27 | 2016-10-27 | A kind of niobium-titanium-boron microalloy fossil oil drill string crossover coupling steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110157980A (en) * | 2019-05-09 | 2019-08-23 | 南京钢铁股份有限公司 | A kind of tool joint steel with superior low temperature impact property |
| CN112048669A (en) * | 2020-08-28 | 2020-12-08 | 南京钢铁股份有限公司 | High-strength and high-toughness steel for drill pipe joint and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003166037A (en) * | 2001-11-28 | 2003-06-13 | Japan Marine Sci & Technol Center | Drill pipe and manufacturing method therefor |
| CN104975235A (en) * | 2015-07-20 | 2015-10-14 | 江阴兴澄特种钢铁有限公司 | High-toughness medium-carbon quenched and tempered round steel of grade 120 KSI and manufacturing method thereof |
-
2016
- 2016-10-27 CN CN201610956511.XA patent/CN106282785A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003166037A (en) * | 2001-11-28 | 2003-06-13 | Japan Marine Sci & Technol Center | Drill pipe and manufacturing method therefor |
| CN104975235A (en) * | 2015-07-20 | 2015-10-14 | 江阴兴澄特种钢铁有限公司 | High-toughness medium-carbon quenched and tempered round steel of grade 120 KSI and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110157980A (en) * | 2019-05-09 | 2019-08-23 | 南京钢铁股份有限公司 | A kind of tool joint steel with superior low temperature impact property |
| CN112048669A (en) * | 2020-08-28 | 2020-12-08 | 南京钢铁股份有限公司 | High-strength and high-toughness steel for drill pipe joint and preparation method thereof |
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