CN105803162B - A kind of 165 steel grade drill pipe weld seam heat treatment methods - Google Patents
A kind of 165 steel grade drill pipe weld seam heat treatment methods Download PDFInfo
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- CN105803162B CN105803162B CN201610400778.0A CN201610400778A CN105803162B CN 105803162 B CN105803162 B CN 105803162B CN 201610400778 A CN201610400778 A CN 201610400778A CN 105803162 B CN105803162 B CN 105803162B
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- weld seam
- drill pipe
- tempering
- welding zone
- quenching
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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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of 165 steel grade drill pipe weld seam heat treatment methods, drill stem welding seam is formed by the rubbed welding of tool joint and drill pipe body, and tool joint grade of steel is 135ksi, and drill pipe body grade of steel is 165ksi；Quenched including step 1, step 2 is tempered for the first time and the tempering of second of step 3, during second of tempering of step 3, will be tempered at 8~12mm of side of the hub of a spool alignment inclined body of weld seam.Present invention reduces welded tube side hardness, makes whole welding zone tissue more uniform, obtains preferable comprehensive mechanical performance, improves service life.
Description
Technical field
The present invention relates to oil drill rocker technical field.
Background technology
With the development of petroleum drilling technology, drilling depth is more and more deeper, and casing programme becomes increasingly complex, to oil drill rocker
Performance requirement be also more and more higher.In order to meet the needs of drilling technology, at present, drill pipe body intensity has been increased to
165ksi.165 steel grade drill pipes are that 165ksi drill pipe bodies and 135ksi tool joints are welded on into one by friction-welding technique
Rise.The chemical composition of 165ksi drill pipe body materials is：C:0.22~0.25%, Si：0.22~0.28%, Mn：0.40~
0.55%, P:≤ 0.010, S≤0.005, Cr：0.95~1.10%, Ni：0.55~0.65%, V:0.13~0.17%.135ksi is bored
The chemical composition of knock-off joint material is：C:0.35~0.38%, Si：0.15~0.25%, Mn：0.85~0.95%, P:≤ 0.013,
S≤0.005, Cr：1.10~1.20%, Ni：≤ 0.25%, V:≤0.03%.Due to drill pipe body and the chemical composition of tool joint
It is different with Technology for Heating Processing, cause the performances such as mechanical strength, the material hardness of drill pipe body and tool joint to have larger difference,
165 steel grade drill pipes weld together two kinds of larger material frictions of performance difference, using conventional drill rod weld seam heat treatment mode
Easily cause the inclined body side excessive high hardness of weld seam, usual welding zone section hardness >=40HRC（Technical requirements≤37HRC）, and edge
The circumferential weld seam impact toughness of drilling rod（Under the conditions of -20 DEG C）Uneven, impact value fluctuation is larger.Current drill stem welding seam heat treatment
Method only includes two steps of quenching and tempering, and the material not differed greatly to weld seam both sides takes specially treated, can cause to weld
Slit-tube side excessive high hardness, weld seam impact toughness are uneven, influence the practical problem of service life.
The content of the invention
The technical problem to be solved in the present invention is to be directed to above-mentioned the deficiencies in the prior art, there is provided a kind of 165 steel grade drill pipes weldering
Heat treatment method is stitched, welded tube side hardness is reduced, makes whole welding zone tissue more uniform, obtain preferable comprehensive mechanical
Can, improve service life.
In order to solve the above technical problems, the technical solution used in the present invention is：
A kind of 165 steel grade drill pipe weld seam heat treatment methods, the drill stem welding seam is through rubbing by tool joint and drill pipe body
Wipe what welding was formed, tool joint grade of steel is 135ksi, and drill pipe body grade of steel is 165ksi；Including step 1- quenchings, step 2-
Second of tempering of tempering for the first time and step 3-, it is when the step 3- is tempered for the second time, tempering hub of a spool alignment weld seam is inclined
At 8~12mm of side of body.
Further, second of tempering of step 3- specifically includes：（1）The drilling rod welding zone that will be cooled to room temperature delivers to tempering line
Position is enclosed, and tempering hub of a spool is aligned at the inclined body side 10mm of weld seam；（2）With 35~38 second time, by welding zone temperature liter
Up to 645~655 DEG C, and be incubated 250~260 seconds after, air is cooled to room temperature.
Further, step 1- quenchings specifically include：（1）Drilling rod welding zone is delivered into quenching coil position, and by weld seam with
Align quenching coil center；（2）With 35~40 second time, welding zone temperature is increased to 925~935 DEG C, and it is incubated 85~
95 seconds；（3）Compressed air quenching, weld seam surfaces externally and internally use compressed air quenching, quenching air outlet pressure >=4.5kg/
cm2, 8~9m of face of weld cooling flow3/ min, 4~5m of weld seam inner surface cooling flow3/min；（4）Insulation terminates to pressure
Contracting air hardening time interval≤5 second.
Further, tempering specifically includes step 2- for the first time：（1）Drilling rod welding zone is delivered into tempering coil position, and will
Weld seam and tempering hub of a spool aligned in position；（2）With 39~42 second time, welding zone temperature is increased to 755~765 DEG C, and protect
For temperature after 175~185 seconds, air is cooled to room temperature.
It is using beneficial effect caused by above-mentioned technical proposal：A kind of 165 steel grade drill pipe weld seam provided by the invention
Heat treatment method, during quenching the quenching of weld seam surfaces externally and internally use compressed air quenching, pass through surfaces externally and internally cooling air delivery
And the control of final outlet pressure, make martensitic structure transformation more abundant, obtain more uniform martensitic structure.First
During secondary tempering, it is tempered using ultra-high temperature, martensite is fully decomposed, the carbon being dissolved in α-Fe significantly reduces so that carbon is dissolved
The effect of reinforcing weakens significantly.During second of tempering, to avoid welding line joint side cementite from continuing to separate out, cause welding line joint side
Lower hardness, therefore tempering coil is offset into 8~12mm to body side and carries out second of temper, it is hard to reduce welded tube side
Degree, and significantly extend soaking time, make whole welding zone stress release more thorough, tissue is more uniform, obtains preferably comprehensive
Mechanical performance is closed, improves service life.
Brief description of the drawings
Coil position schematic diagram when Fig. 1 is quenching；
Fig. 2 is coil position schematic diagram when being tempered for the first time；
Coil position schematic diagram when Fig. 3 is second of tempering；
Fig. 4 is stretching, impact test sampling distribution map；
Fig. 5 is section hardness test sampling point distributions figure.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description, but the protection model of the present invention
Enclose be not limited to it is as described below.
A kind of one embodiment of 165 steel grade drill pipe weld seam heat treatment method of the present invention, including：Step 1- quenchings, step
Second of tempering of 2- tempering for the first time and step 3-.
The specific steps and parameter of step 1- quenchings are as follows：
（1）Drilling rod welding zone is delivered into quenching coil position, and weld seam is alignd with quenching coil center, such as Fig. 1 institutes
Show；
（2）With 35~40 second time, welding zone temperature is increased to 925~935 DEG C, and be incubated 85~95 seconds；
（3）Compressed air quenching, weld seam surfaces externally and internally use compressed air quenching, and quenching air outlet pressure >=
4.5kg/cm2, 8~9m of face of weld cooling flow3/ min, 4~5m of weld seam inner surface cooling flow3/min；
（4）Insulation terminates to arrive compressed air quenching time interval≤5 second.
The specific steps of tempering and parameter are as follows for the first time by step 2-：
（1）Drilling rod welding zone is delivered into tempering coil position, and by weld seam with being tempered hub of a spool aligned in position, such as Fig. 2 institutes
Show；
（2）With 39~42 second time, welding zone temperature is increased to 755~765 DEG C, and after being incubated 175~185 seconds, air
It is cooled to room temperature.
Second of specific steps being tempered of step 3- and parameter are as follows：
（1）The drilling rod welding zone that will be cooled to room temperature delivers to tempering coil position, and it is inclined to be tempered hub of a spool alignment weld seam
At 8~12mm of body side, as shown in Figure 3；
（2）With 35~38 second time, welding zone temperature is increased to 645~655 DEG C, and after being incubated 250~260 seconds, air
It is cooled to room temperature.
As shown in figure 4, taking three axial cross sections in drilling rod welding zone, these three axial cross sections are circumferentially uniformly distributed for 120 °,
As shown in figure 5,14 sampled points are taken to do experiment again on each axial cross section.Result of the test is as shown in Table 1 and Table 2.
A kind of 165 steel grade drill pipe weld seam heat treatment method provided by the invention can make the surrender of 165 steel grade drill pipe welding zones
Intensity >=862MPa, tensile strength >=931MPa, welding zone section hardness≤37HRC, average impact work(>=42J (10 × 10, -20
DEG C), circumferentially 120 ° of distributions（As shown in Figure 4）Ballistic work difference≤20J.
After adopting the above technical scheme, the quenching of weld seam surfaces externally and internally uses compressed air quenching during quenching, by inside and outside
The control of surface cooling air delivery and final outlet pressure, make martensitic structure transformation more abundant, obtain more uniform
Martensitic structure.When being tempered for the first time, it is tempered using ultra-high temperature, martensite is fully decomposed, the carbon being dissolved in α-Fe is bright
It is aobvious to reduce so that the effect of carbon solution strengthening weakens significantly.During second of tempering, to avoid welding line joint side cementite from continuing to analyse
Go out, cause welding line joint side lower hardness, therefore tempering coil is offset into 8~12mm to body side and carried out at second of tempering
Reason, welded tube side hardness is reduced, and significantly extend soaking time, make whole welding zone stress release more thorough, tissue is more
Add uniformly, obtain preferable comprehensive mechanical performance, improve service life.
Claims (3)
1. a kind of 165 steel grade drill pipe weld seam heat treatment methods, the drill stem welding seam is rubbed by tool joint and drill pipe body
What welding was formed, it is characterised in that：The tool joint grade of steel is 135ksi, and the drill pipe body grade of steel is 165ksi；Including
Second of tempering of step 1- quenchings, step 2- tempering for the first time and step 3-, when the step 3- is tempered for the second time, will be tempered line
At 8~12mm of side of the circle center alignment inclined body of weld seam；
The step 1- quenchings specifically include：（1）Drilling rod welding zone is delivered into quenching coil position, and by weld seam and quenching coil
Heart aligned in position；（2）With 35~40 second time, welding zone temperature is increased to 925~935 DEG C, and be incubated 85~95 seconds；（3）Pressure
Contracting air hardening, weld seam surfaces externally and internally use compressed air quenching, quenching air outlet pressure >=4.5kg/cm2, outside weld seam
Surface 8~9m of cooling flow3/ min, 4~5m of weld seam inner surface cooling flow3/min；（4）Insulation terminates to arrive compressed air quenching
Time interval≤5 second.
A kind of 2. 165 steel grade drill pipe weld seam heat treatment method according to claim 1, it is characterised in that the step 3-
Double tempering specifically includes：（1）The drilling rod welding zone that will be cooled to room temperature delivers to tempering coil position, and will be tempered hub of a spool pair
At the quasi- inclined body side 10mm of weld seam；（2）With 35~38 second time, welding zone temperature is increased to 645~655 DEG C, and it is incubated 250~
After 260 seconds, air is cooled to room temperature.
A kind of 3. 165 steel grade drill pipe weld seam heat treatment method according to claim 1, it is characterised in that the step 2-
Once tempering specifically includes：（1）Drilling rod welding zone is delivered into tempering coil position, and by weld seam with being tempered hub of a spool position pair
Together；（2）With 39~42 second time, welding zone temperature is increased to 755~765 DEG C, and after being incubated 175~185 seconds, air is cooled to
Room temperature.
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| CN201610400778.0A CN105803162B (en) | 2016-06-08 | 2016-06-08 | A kind of 165 steel grade drill pipe weld seam heat treatment methods |
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| CN201610400778.0A CN105803162B (en) | 2016-06-08 | 2016-06-08 | A kind of 165 steel grade drill pipe weld seam heat treatment methods |
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| CN105803162B true CN105803162B (en) | 2017-11-21 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7238124B2 (en) * | 2018-11-19 | 2023-03-13 | アルセロールミタル | Dual-pass, dual-anneal welding method for joining high-strength steel |
| CN113106203A (en) * | 2021-03-18 | 2021-07-13 | 山东威玛装备科技股份有限公司 | Thick-wall drill rod friction welding seam layered heat treatment process |
| CN112831646A (en) * | 2021-03-18 | 2021-05-25 | 山东威玛装备科技股份有限公司 | Heat treatment process for weld joint of thin-wall drill rod |
| CN114574684A (en) * | 2021-05-15 | 2022-06-03 | 山西风雷钻具有限公司 | Method for heat treatment of welding area of mining drill rod |
| CN113667814B (en) * | 2021-08-19 | 2023-05-05 | 海隆石油工业集团有限公司 | Heat treatment process for drill pipe welding area |
| CN113667815B (en) * | 2021-08-19 | 2023-05-05 | 海隆石油工业集团有限公司 | Sulfur-resistant drill rod welding area heat treatment process and drill rod prepared by same |
| CN115449604A (en) * | 2022-09-21 | 2022-12-09 | 无锡双马钻探工具有限公司 | Non-excavation integral drill rod processing technology |
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| CN102268530B (en) * | 2011-06-27 | 2013-03-06 | 江苏融泰石油科技股份有限公司 | Heat treatment method of weld seam of welding weighted drill pipe |
| CN102399970B (en) * | 2011-11-18 | 2014-02-05 | 中国石油集团渤海石油装备制造有限公司 | Heat treatment method for V150 steel grade drill rod welded seam |
| CN103320697B (en) * | 2013-06-17 | 2015-11-18 | 中国石油集团渤海石油装备制造有限公司 | A kind of drill pipe body and manufacture method thereof being applied to ultra deep well operating mode |
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Effective date of registration: 20200924 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd. Patentee after: BOHAI NKK DRILLING PIPE Co.,Ltd. Address before: 300457, Tianjin, Tanggu Development Zone, No. 19 West Ring Road, Tianjin Binhai service outsourcing industry park, building 3 Patentee before: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd. Patentee before: BOHAI NKK DRILLING PIPE Co.,Ltd. |