CN108277440A - A kind of yield strength is more than the drilling rod steel pipe and its manufacturing method of 1138MPa - Google Patents
A kind of yield strength is more than the drilling rod steel pipe and its manufacturing method of 1138MPa Download PDFInfo
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- CN108277440A CN108277440A CN201810300984.3A CN201810300984A CN108277440A CN 108277440 A CN108277440 A CN 108277440A CN 201810300984 A CN201810300984 A CN 201810300984A CN 108277440 A CN108277440 A CN 108277440A
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- steel pipe
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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
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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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
- C22C38/002—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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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The present invention relates to drilling rod steel pipes and its manufacturing method that a kind of yield strength is more than 1138MPa, are first smelted into steel billet by following compositions, ingredient is organized by mass percentage as C：0.22~0.28%, Si：0.15~0.20%, Mn：0.4~0.7%, Cr：1.3~1.6%, Mo：0.7~1.0%, Ni：1.5~1.9%, Nb:0.07~0.15%, S≤0.004% and P≤0.01%, remaining is iron and inevitable impurity；Heating steel billet is uniform, rolling perforation is carried out, steel pipe is obtained；Steel pipe is heat-treated, water cooling to room temperature, obtains the drilling rod steel pipe that yield strength is more than 1138MPa.The present invention ensures the uniform tiny of tissue, while deformation and residual stress control are ensured the high-strength tenacity matching of drilling rod in extremely low range by rationally controlling C, Si, Cr, Mn, Mo, Ni, Nb, S and P element content by the way of water cooling.
Description
Technical field
The present invention relates to a kind of drilling rod steel pipes and its manufacturing method more particularly to a kind of yield strength to be more than 1138MPa
Drilling rod steel pipe and its manufacturing method.
Background technology
Drilling rod is a kind of important tool of oil and gas well drilling operation.In order to meet the need of Deep Oil And Gas Exploration drilling well exploitation
It asks, drilling rod manufacturer has designed and developed the high-strength drill pipe that intensity reaches 1138MPa (165ksi) in succession.Patent CN103938095B
It is proposed a kind of 165ksi grade of steels high intensity and high ductility drilling rod and its manufacturing method, ingredient percent C：0.20-0.40%,
Mn：0.50-1.40%, Cr：0.50-1.40%, Mo：0.60-2.10%, Ti：0.005~0.025%, Nb：0.03~
0.10%, V：0.02~0.15%, Si：0.20~0.40%, Al≤0.05%, N≤0.10%, P≤0.015%, S≤
0.008%, remaining is iron and inevitable impurity.And Mn decreasing value=(3~6) × C value addeds, [Nb]+[V]+[Ti]≤
0.25%, 5≤[Nb]/[Ti]≤10,1%≤[Cr]+[Mo]≤3%, drilling rod yield strength is up to 1138MPa (165ksi).
Patent CN102268609A proposes a kind of ultrahigh-strength high-toughness drill rod pipe body and its heat treatment process, is contained using low Mn elements
Amount carries out microalloying by adding V element (0.1~0.3%), and the chemical composition of drill pipe body is C：0.20~0.28%,
Mn：0.50~0.6%, P≤0.010%, S≤0.005%, V：0.1~0.3%, Al≤0.03%, 1.5%≤Cr+Mo+Ni
≤ 3.0%, remaining is Fe and trace element, and heat treatment process includes quenching twice and primary tempering, and yield strength is reachable
150~180ksi (1033~1240MPa).Enhanced using V element, but when V content is excessively high, is easy to cause the crystalline substance of V element
Boundary is segregated, and is accordingly reduced using quenching twice and the technique being once tempered, the production efficiency of drilling rod product.Patent
CN104651741B discloses a kind of high tough drill rod materials of 160 grade of steels, and 160 steel are manufactured using the method for addition rare earth element ce
Grade drill rod materials, but Ce elements there is a problem of unstable in production, and and production cost is higher.
The high-strength drill pipe that the yield strength designed at present reaches 1138MPa is mainly on the basis of common drill rod materials
The intensified elements such as the content of the alloying elements such as Mn and Mo in material, or addition V are adjusted, are obtained by modulating heat treatment, modulation heat
High tempering in processing procedure is all made of air-cooled mode and is cooled down, and manufacturing cycle of drilling rod is longer, low production efficiency.
Invention content
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of yield strengths to be more than 1138MPa
Drilling rod steel pipe and its manufacturing method, steel pipe yield strength obtained be more than 1138MPa, good toughness.
In order to achieve the above object, steel pipe of the present invention adopts the following technical scheme that：
By mass percentage, at being grouped into：C：0.22~0.28%, Si：0.15~0.20%, Mn：0.4~
0.7%, Cr：1.3~1.6%, Mo：0.7~1.0%, Ni：1.5~1.9%, Nb：0.07~0.15%, S≤0.004% and P
≤ 0.01%, remaining is iron and inevitable impurity.
Further, the yield strength of the steel pipe is more than 1138MPa, and tensile strength is more than 1206MPa, and elongation is more than
13%, the impact absorbing under the conditions of -20 DEG C can be more than 100J.
Further, the yield strength of the steel pipe is in 1208~1255MPa, and tensile strength is in 1290~1315MPa, elongation
Impact absorbing of the rate under the conditions of 19~20%, -20 DEG C can be in 110~117J.
Further, by mass percentage, at being grouped into：C：0.25~0.28%, Si：0.16~0.18%,
Mn：0.49~0.61%, Cr：1.20~1.42%, Mo：0.79~0.86%, Ni：1.50~1.72%, Nb:0.07~
0.10%, S≤0.004% and P≤0.01%, remaining is iron and inevitable impurity.
Further, by mass percentage, at being grouped into：C：0.25~0.28%, Si：0.18%, Mn：0.49
~0.55%, Cr：1.26~1.42%, Mo：0.82~0.86%, Ni：1.52~1.72%, Nb:0.07~0.10%, S≤
0.004% and P≤0.01%, remaining is iron and inevitable impurity.
The technical solution of manufacturing method of the present invention is：Include the following steps：
(1) steel billet is smelted by following compositions, ingredient is organized by mass percentage as C：0.22~0.28%,
Si：0.15~0.20%, Mn：0.4~0.7%, Cr：1.3~1.6%, Mo：0.7~1.0%, Ni：1.5~1.9%, Nb：
0.07~0.15%, S≤0.004% and P≤0.01%, remaining is iron and inevitable impurity；
(2) heating steel billet is uniform, rolling perforation is carried out, steel pipe is obtained；
(3) steel pipe is heat-treated, water cooling to room temperature, obtains the drilling rod steel pipe that yield strength is more than 1138MPa.
Further, steel billet carries out rolling perforation in 1000 DEG C~1100 DEG C temperature range homogeneous heatings in step (2),
Finishing temperature control is at 900 DEG C~1050 DEG C.
Further, process of thermal treatment is in step (3)：Hardening heat be 900 DEG C~950 DEG C, heat preservation 30min with
On, using water as cooling medium, temperature is 580 DEG C~620 DEG C, and soaking time is 30min~60min, water cooling to room temperature.
Compared with prior art, the present invention has technique effect beneficial below：
In the tube material of the present invention by using 0.22~0.28% C, be the essential element for determining hardness of steel, can be with
Hardness of steel is improved, the formation of quenching process middle plate strip martensite is promoted, it is too high or too low, the content of martensite can be significantly affected,
Reduce the toughness of steel；Silicate is formed as the oxide in deoxidier, with molten steel using 0.15~0.20% Si, makes steel body
Densification controls Si contents, had not only ensured abundant deoxidation, but also the formation of control field trash, and had improved structural homogenity, ensure the height of steel pipe
Toughness, Si too high levels can significantly reduce the toughness of steel；Using 0.4~0.7% Mn, the quenching degree of steel can be improved, with C,
Cr and Nb coordinateds increase substantially the content of quenching structure middle plate strip martensite, improve the intensity and impact absorbing energy of steel,
The structural homogenity of steel can be influenced when too high levels；1.3~1.6% Cr is added, is carbide former, with C, Mn and Nb
Element coordinates, and improves the intensity of steel, promotes the formation of fine uniform martensitic structure in quenching process, steel can be reduced when excessively high
Toughness；0.7~1.0% Mo is added, the intensity and temper resistance of steel can be improved, cooperate with and match with C, Mn, Cr and Ni element
It closes, reduces the residual stress in Cooling Process, control the deformation in Cooling Process, reduce steel ductile-brittle transition temperature；Addition 1.5~
1.9% Ni improves the obdurability of steel, with C, Mn, Cr and Mo element coordinated, reduces the deformation in Cooling Process and remnants
Stress；0.07%~0.15%Nb is added, with C, Cr and Ni element coordinated, significantly crystal grain thinning, forms hardening constituent, carry
The obdurability of Gao Gang matches, excessively high, and easily leading to segregation reduces the toughness of steel；By controlling hazardous elements S≤0.004%, control
The formation that MnS is mingled with ensures the toughness of steel；By controlling harmful element P≤0.010%, avoids that steel is made to generate segregation, improve heat
Structural transformation rate in processing procedure, ensures the microstructure of steel and the uniformity of performance.
The present invention is by controlling the chemical composition of tube material, and each ingredient coordinated, the yield strength of gained steel pipe is big
In 1138MPa, tensile strength is more than 1206MPa, and elongation is more than 13%, and the impact absorbing under the conditions of -20 DEG C can be more than 100J,
Improve the obdurability of drilling rod.
Manufacturing method of the present invention is simple, and the manufacturing cycle is short.It is heat treated by controlling the coordinated of steel pipe chemical composition
High temperature in journey is quenched using water as cooling medium, and the content for forming lath martensite is apparently higher than at present using material, is
Ensure steel pipe high-strength tenacity provide condition, and water as cool down medium cost be substantially less than it is used at present all kinds of special
Coolant liquid, for high tempering in the process using water as cooling medium, cooling velocity is apparently higher than air cooling speed used at present
Degree, is greatly lowered manufacturing cycle and the manufacturing cost of drilling rod.It is mostly used in the high temperature quenching process of current high tensile steel tube
Dedicated coolant liquid, if be water-cooled easily lead to steel pipe reduced performance even it is cracking；Current high tensile steel tube
Air cooled mode is mostly used during high tempering, if using water cooling, very big deformation is will produce and remnants is answered
Power；And the present invention is passed through by rationally controlling C, Si, Cr, Mn, Mo, Ni, Nb, S and P element content in steel pipe chemical composition
Coordinated between chemical element is obtained uniformly tiny microscopic structure by the way of water cooling, field trash is greatly lowered
And the formation of adverse tissue, while deformation and residual stress control are ensured into the high-strength tenacity matching of steel pipe in extremely low range,
And considerably reduce manufacturing cost and the manufacturing cycle of steel pipe.
Specific implementation mode
A kind of yield strength of the present invention is more than 1138MPa drilling rod steel pipes, and chemical composition (mass percent) is C：
0.22~0.28%, Si：0.15~0.20%, Mn：0.4~0.7%, Cr：1.3~1.6%, Mo：0.7~1.0%, Ni：1.5
~1.9%, Nb:0.07~0.15%, S≤0.004%, P≤0.01%, remaining is iron and inevitable impurity.
The manufacturing method of steel pipe of the present invention includes the following steps：
(1) round steel billet is smelted into according to following compositions, chemical composition (mass percent) is C：0.22~
0.28%, Si：0.15~0.20%, Mn：0.4~0.7%, Cr：1.3~1.6%, Mo：0.7~1.0%, Ni：1.5~
1.9%, Nb:0.07~0.15%, S≤0.004%, P≤0.01%, remaining is iron and inevitable impurity.
(2) steel billet is subjected to rolling perforation, finishing temperature control after 1000 DEG C~1100 DEG C temperature range homogeneous heatings
At 900 DEG C~1050 DEG C；
(3) whole modulation heat treatment is carried out to steel pipe, heat treatment process is：In quenching process heating temperature be 900 DEG C~
950 DEG C, 30min or more is kept the temperature, using water as cooling medium, obtains uniform tiny lath martensite tissue, in drawing process
Heating temperature is 580 DEG C~620 DEG C, and soaking time is 30min~60min, it is cooling medium with water, is quickly cooled to room temperature.
Embodiment 1
Round steel billet is smelted into according to the ingredient in following table 1.Steel billet carries out rolling after 1050 DEG C of homogeneous heatings and wears
Hole, finishing temperature control is at 1000 DEG C；Steel pipe is heated to 930 DEG C, keeps the temperature 40min, then using water as cooling medium by steel
Pipe is cooled to room temperature；Steel pipe after cooling is heated to 600 DEG C, keeps the temperature as 50min, is quickly cooled to using water as cooling medium
The mechanical properties of pipe of room temperature, acquisition is as shown in table 2.
Table 1 is chemical composition of the embodiment of the present invention 1 to 3 drilling rod steel pipe of embodiment, table 2 be the embodiment of the present invention 1 to
The test result of embodiment 3, obdurability are substantially better than certain existing 2 kinds of steel pipe shown in table 3.The manufacture of embodiment 2 and embodiment 3
Method is the same as embodiment 1.
The chemical composition (Wt, %) of 1 steel pipe of table
| C | Si | Mn | Cr | Mo | Ni | Nb | S | P | |
| Embodiment 1 | 0.27 | 0.16 | 0.61 | 1.30 | 0.79 | 1.50 | 0.09 | 0.004 | 0.008 |
| Embodiment 2 | 0.25 | 0.18 | 0.55 | 1.36 | 0.82 | 1.72 | 0.10 | 0.004 | 0.010 |
| Embodiment 3 | 0.28 | 0.18 | 0.49 | 1.42 | 0.86 | 1.52 | 0.07 | 0.003 | 0.006 |
The mechanical property of 2 steel pipe of table
| Tensile strength (MPa) | Yield strength/MPa | Elongation/% | Impact absorbing can (- 20 DEG C)/J | |
| Embodiment 1 | 1290 | 1208 | 20 | 117 |
| Embodiment 2 | 1315 | 1255 | 19 | 110 |
| Embodiment 3 | 1306 | 1230 | 20 | 116 |
The mechanical property of certain the existing 2 kinds of steel pipe of table 3
| Tensile strength (MPa) | Yield strength/MPa | Elongation/% | Impact absorbing can (- 20 DEG C)/J | |
| Certain existing steel pipe 1 | 1250 | 1200 | 22.4 | 79 |
| Certain existing steel pipe 2 | 1251 | 1167 | 17.6 | 78 |
Embodiment 4
Round steel billet is smelted into according to following compositions, chemical composition (mass percent) is C：0.22%, Si：
0.20%, Mn：0.4%, Cr：1.6%, Mo：0.7%, Ni：1.9%, Nb:0.15%, S：0.003%, P：0.009%, remaining
For iron and inevitable impurity.Steel billet carries out rolling perforation after 1000 DEG C of homogeneous heatings, and finishing temperature control is at 900 DEG C；
Steel pipe is heated to 900 DEG C, keeps the temperature 50min, steel pipe is then cooled to room temperature using water as cooling medium；By steel after cooling
Pipe is heated to 580 DEG C, keeps the temperature as 60min, and room temperature is quickly cooled to using water as cooling medium.
Embodiment 5
Round steel billet is smelted into according to following compositions, chemical composition (mass percent) is C：0.26%, Si：
0.15%, Mn：0.7%, Cr：1.3%, Mo：1.0%, Ni：1.8%, Nb:0.11%, S：0.002%, P：0.007%, remaining
For iron and inevitable impurity.Steel billet carries out rolling perforation after 1100 DEG C of homogeneous heatings, and finishing temperature control is at 1050 DEG C；
Steel pipe is heated to 950 DEG C, 30min is kept the temperature, steel pipe is then cooled to room temperature using water as coolant liquid；By steel pipe after cooling
620 DEG C are heated to, is kept the temperature as 30min, room temperature is quickly cooled to using water as cooling medium.
The drilling rod steel pipe of the present invention, yield strength are more than 1138MPa, and tensile strength is more than 1206MPa, and elongation is more than
13%, impact of collision, which absorbs, under the conditions of -20 DEG C to improve the obdurability of drilling rod higher than 100J, superhigh intensity is greatly lowered
The manufacturing cycle of drilling rod and cost.
Claims (8)
1. a kind of yield strength is more than the drilling rod steel pipe of 1138MPa, it is characterised in that：By mass percentage, at grouping
Become：C：0.22~0.28%, Si：0.15~0.20%, Mn：0.4~0.7%, Cr：1.3~1.6%, Mo：0.7~
1.0%, Ni：1.5~1.9%, Nb：0.07~0.15%, S≤0.004% and P≤0.01%, remaining is for iron and unavoidably
Impurity.
2. a kind of yield strength according to claim 1 is more than the drilling rod steel pipe of 1138MPa, it is characterised in that：The steel
The yield strength of pipe is more than 1138MPa, and tensile strength is more than 1206MPa, and elongation is more than 13%, the impact under the conditions of -20 DEG C
Absorption can be more than 100J.
3. a kind of yield strength according to claim 1 or 2 is more than the drilling rod steel pipe of 1138MPa, it is characterised in that：It should
The yield strength of steel pipe is in 1208~1255MPa, and tensile strength is in 1290~1315MPa, and elongation is at 19~20%, -20 DEG C
Under the conditions of impact absorbing can be in 110~117J.
4. a kind of yield strength according to claim 1 is more than the drilling rod steel pipe of 1138MPa, it is characterised in that：By matter
Percentages are measured, at being grouped into：C：0.25~0.28%, Si：0.16~0.18%, Mn：0.49~0.61%, Cr：
1.20~1.42%, Mo：0.79~0.86%, Ni：1.50~1.72%, Nb:0.07~0.10%, S≤0.004% and P≤
0.01%, remaining is iron and inevitable impurity.
5. a kind of yield strength according to claim 1 is more than the drilling rod steel pipe of 1138MPa, it is characterised in that：By matter
Percentages are measured, at being grouped into：C：0.25~0.28%, Si：0.18%, Mn：0.49~0.55%, Cr：1.26~
1.42%, Mo：0.82~0.86%, Ni：1.52~1.72%, Nb:0.07~0.10%, S≤0.004% and P≤0.01%,
Remaining is iron and inevitable impurity.
6. a kind of manufacturing method of drilling rod steel pipe of yield strength more than 1138MPa, it is characterised in that：Include the following steps：
(1) steel billet is smelted by following compositions, ingredient is organized by mass percentage as C：0.22~0.28%, Si：
0.15~0.20%, Mn：0.4~0.7%, Cr：1.3~1.6%, Mo：0.7~1.0%, Ni：1.5~1.9%, Nb：0.07
~0.15%, S≤0.004% and P≤0.01%, remaining is iron and inevitable impurity；
(2) heating steel billet is uniform, rolling perforation is carried out, steel pipe is obtained；
(3) steel pipe is heat-treated, water cooling to room temperature, obtains the drilling rod steel pipe that yield strength is more than 1138MPa.
7. a kind of manufacturing method of drilling rod steel pipe of the yield strength according to claim 6 more than 1138MPa, feature
It is：Steel billet carries out rolling perforation, finishing temperature control in 1000 DEG C~1100 DEG C temperature range homogeneous heatings in step (2)
At 900 DEG C~1050 DEG C.
8. a kind of manufacturing method of drilling rod steel pipe of the yield strength according to claim 6 more than 1138MPa, feature
It is：Process of thermal treatment is in step (3)：Hardening heat is 900 DEG C~950 DEG C, keeps the temperature 30min or more, using water as cold
But medium, temperature are 580 DEG C~620 DEG C, and soaking time is 30min~60min, water cooling to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810300984.3A CN108277440B (en) | 2018-04-04 | 2018-04-04 | Steel pipe with yield strength larger than 1138MPa for drill rod and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810300984.3A CN108277440B (en) | 2018-04-04 | 2018-04-04 | Steel pipe with yield strength larger than 1138MPa for drill rod and manufacturing method thereof |
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|---|---|
| CN108277440A true CN108277440A (en) | 2018-07-13 |
| CN108277440B CN108277440B (en) | 2020-08-07 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892443A (en) * | 2010-07-09 | 2010-11-24 | 天津钢管集团股份有限公司 | High strength and high toughness petroleum casing pipe at steel grade with yield strength of 170-180ksi and manufacturing method thereof |
-
2018
- 2018-04-04 CN CN201810300984.3A patent/CN108277440B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892443A (en) * | 2010-07-09 | 2010-11-24 | 天津钢管集团股份有限公司 | High strength and high toughness petroleum casing pipe at steel grade with yield strength of 170-180ksi and manufacturing method thereof |
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| CN108277440B (en) | 2020-08-07 |
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