CN105755252A - Process for heat treatment of tube body of drilling rod - Google Patents
Process for heat treatment of tube body of drilling rod Download PDFInfo
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- CN105755252A CN105755252A CN201410771595.0A CN201410771595A CN105755252A CN 105755252 A CN105755252 A CN 105755252A CN 201410771595 A CN201410771595 A CN 201410771595A CN 105755252 A CN105755252 A CN 105755252A
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- drill pipe
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- drilling rod
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Abstract
The invention discloses a process for heat treatment of a tube body of a drilling rod; the process comprises quenching and tempering heat treatment. The process is operated by the following steps with the following process parameters: (1) quenching: a, conveying the tube body of the drilling rod to a stepping quenching furnace with the temperature rising to be 880 DEG C-930 DEG C, and carrying out heat preservation for 40-60 minutes; b, taking the tube body of the drilling rod out of the furnace and placing the tube body of the drilling rod into a quenching solution with the temperature being 10 DEG C-30 DEG C within 15 seconds, wherein the quenching time is no less than 30 seconds; and (2) tempering: conveying the tube body of the drilling rod to a stepping tempering furnace with the temperature rising to be 560 DEG C-590 DEG C, carrying out heat preservation for 60-85 minutes, taking the tube body of the drilling rod out of the furnace, and naturally cooling the tube body of the drilling rod to the room temperature. When adopting of the process, the impact performance of the drilling rod is good and is more than or equal to 30% more than a V150 steel grade standard value; the strength, elongation rate and other mechanical indicators of the tube body of the drilling rod after heat treatment meet V150 steel grade requirements, and the qualification rate reaches 98% or more; and moreover, the operating steps and process parameters of the heat treatment are reasonable.
Description
Technical field
The present invention relates to the Technology for Heating Processing of a kind of body, especially a kind of manufacture has the relatively quenching of the drill pipe body of high-mechanical property, tempering process so that it is can reach the standard of V150 grade of steel.
Background technology
Oil drill rocker is the main tool of oil drilling, and structure includes drill pipe body and the tool joint at drill pipe body two ends.In the exploitation and extractive process of oil gas, it is desirable to drill pipe body allows for bearing huge interior external pressure, distortion, bending and vibration.
Along with the development of petroleum industry, increasing deep-well, ultradeep well are developed, and drilling rod is just proposed increasingly higher requirement by this.What in current API series drilling rod, intensity was the highest is S135 grade of steel, but along with the increase of drilling depth, the requirement of strength of drilling rod is also being continuously increased, and the drilling rod of S135 grade of steel cannot meet the requirement of part deep-well.
External drilling rod industry proposes the standard of this new grade of steel of drilling rod industry of V150 grade of steel.Raw material and heat treatment capacity are all had higher requirement by V150 steel grade drill pipe.Current domestic disclosed Technology for Heating Processing, is extremely difficult to the technology requirement of V150 steel grade drill pipe, and especially the tensile property of the drill pipe body after heat treatment can not meet requirement, and relevant Technology for Heating Processing abroad also has no report.
Summary of the invention
The technical problem to be solved in the present invention is to provide the Technology for Heating Processing that a kind of manufacture reliable, that be easy to operate meets the drill pipe body of V150 grade of steel.
For solving above-mentioned technical problem, the technical solution used in the present invention includes quenching, tempering, and steel grades and content for Technology for Heating Processing are, C:0.24-0.30, Cr:0.85-1.20, Mo:0.50-0.75, V:0-0.05, Si:0.10-0.40, Mn:0.60-1.00, Cu:0-0.05, S :≤0.015, P :≤0.020, surplus is Fe, unit is mass percent, is operated with technological parameter as follows:
1. quench
A, drill pipe body is transported in the step-by-step movement glowing furnace being warming up to 880 DEG C-930 DEG C, is incubated 40-60 minute,
After b, drill pipe body are come out of the stove, entering the quenching liquid of 10 DEG C-30 DEG C in 15 seconds, the cool time was no less than 30 seconds；
2. tempering
Drill pipe body is transported in the step-by-step movement tempering furnace being warming up to 560 DEG C-590 DEG C, is incubated 60-85 minute, then drill pipe body is come out of the stove, naturally cool to room temperature.
Further it is improved by:
Drill pipe body after quenching carried out tempering in four hours.
Described quenching liquid is tap water, and the temperature of quenching liquid is regulated by cooling tower.
Quenching Step 1. described in drill pipe body in quenching liquid, carry out rotation, autorotation speed is 70-100 rev/min.
1. after 2. processing no more than 200 of drill pipe body with step according to step, doing the mechanical test of 1 upset end and drill pipe body, pilot project is tensile strength and ballistic work, after qualified, and warehouse-in.This step is to strengthen quality monitoring.Described ballistic work test underproof drill pipe body again according to step 1. and 2. carry out quenching, tempering heat treatment, quenching again, tempering heat treatment number of times less than three times.
During described ballistic work pass the test, 2. the higher drill pipe body of tensile strength carries out tempering again according to step, times of tempering is less than three times, the drill pipe body of low cross-intensity again according to step 1. and 2. carry out quenching, tempering heat treatment, quenching again, tempering heat treatment number of times are less than three times.
After adopting the present invention that the drill pipe body of above-mentioned steel grade is carried out heat treatment, the ballistic work performance of drill pipe body is good, compared with the 54J of V150 grade of steel standard value, beyond more than 30%；And the mechanical index such as the intensity of the drill pipe body after heat treatment, elongation percentage all reach the requirement of V150 grade of steel, have filled up blank both domestic and external；The heat treatment step that the present invention is arranged is simple, and technological parameter is reasonable, processes qualification rate and reaches more than 98%.
Detailed description of the invention
Below by detailed description of the invention, invention is described in further detail.
Adopting the drill pipe body of certain company, its chemical composition is, C:0.26, Cr:0.98, Mo:0.64, V:0.005, Si:0.22, Mn:0.75, Cu:0.03, S:0.001, P:0.008, and surplus is Fe, and unit is mass percent.Heat treatment is carried out according to the following step:
1. quench
A, drill pipe body is transported in the step-by-step movement glowing furnace being warming up to 910 DEG C, is incubated 60 minutes；
After b, drill pipe body are come out of the stove, the quenching liquid of 23 DEG C is entered in 15 seconds, quenching liquid is tap water, and carry out rotation with the speed of 88 revs/min, 40 seconds cool times, wherein the temperature of quenching liquid is regulated by cooling tower, and drill pipe body is for quick, uniform hardening with given pace rotation, forms grain structure tiny, uniform.
2. tempering
In quenching 1 hour, drill pipe body is transported in the step-by-step movement tempering furnace being warming up to 575 DEG C, is incubated 70 minutes；Again drill pipe body is come out of the stove, naturally cool to room temperature.Through above heat treatment step, the mechanical performance of drill pipe body is as follows:
Yield strength 1090MPa
Tensile strength 1180MPa
Elongation percentage 22.0%
The longitudinal 99J of Charpy-V impact power (21 DEG C).
The mechanical performance of above-mentioned drill pipe body meets following V150 grade of steel technology and requires:
Yield strength 1034-1138MPa
Tensile strength >=1103MPa
Elongation percentage >=13.0%
Charpy-V impact power (21 DEG C) longitudinal direction >=54J.
The metallographic structure of the body after the Technology for Heating Processing of the drill pipe body of the present invention processes, uniform small grains, upset end inside and outside wall is 10 grades, and inboard wall of tube body 9 grades, outer wall 9.5 grades, the performance for aspects such as the tension of drill pipe body, resisting fatigue provides guarantee.
After above-mentioned steps quenching, tempering heat treatment drill pipe body 100, doing the mechanical test of 1 upset end and drill pipe body as quality monitoring, pilot project is tensile strength and ballistic work.Two result of the tests all meet the technology requirement of V150 grade of steel, are put in storage by the 100 of above-mentioned process drill pipe bodies.
If ballistic work test underproof drill pipe body again according to step 1. and 2. carry out quenching, tempering heat treatment, quenching again, tempering heat treatment number of times less than three times.
When ballistic work pass the test, 2. the higher drill pipe body of tensile strength carries out tempering again according to step, times of tempering less than three times, the drill pipe body of low cross-intensity again according to step 1. and 2. carry out quenching, tempering heat treatment, quenching again, tempering heat treatment number of times are less than three times.
Claims (3)
1. a Technology for Heating Processing for drill pipe body, including quenching, tempering, steel grades and content for Technology for Heating Processing are, C:0.24-0.30, Cr:0.85-1.20, Mo:0.50-0.75, V:0-0.05, Si:0.10-0.40, Mn:0.60-1.00, Cu:0-0.05, S :≤0.015, P :≤0.020, surplus is Fe, unit is mass percent, it is characterised in that be operated with technological parameter as follows:
1. quench
A, drill pipe body is transported in the step-by-step movement glowing furnace being warming up to 880 DEG C-930 DEG C, is incubated 40-60 minute,
After b, drill pipe body are come out of the stove, entering the quenching liquid of 10 DEG C-30 DEG C in 15 seconds, the cool time was no less than 30 seconds, described drill pipe body carries out rotation in quenching liquid, and autorotation speed is 70-100 rev/min, and described quenching liquid is tap water, the temperature of quenching liquid is regulated by cooling tower
2. tempering
Drill pipe body is transported in the step-by-step movement tempering furnace being warming up to 560 DEG C-590 DEG C, is incubated 60-85 minute, then drill pipe body is come out of the stove, naturally cool to room temperature.
2. the Technology for Heating Processing of drill pipe body according to claim 1, it is characterised in that the drill pipe body after quenching carried out tempering in four hours.
3. the Technology for Heating Processing of drill pipe body according to claim 1, it is characterized in that, after 1. 2. processing no more than 200 of drill pipe body with step according to step, do the mechanical test of 1 upset end and drill pipe body, pilot project is tensile strength and ballistic work, warehousing after passing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410771595.0A CN105755252A (en) | 2014-12-13 | 2014-12-13 | Process for heat treatment of tube body of drilling rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410771595.0A CN105755252A (en) | 2014-12-13 | 2014-12-13 | Process for heat treatment of tube body of drilling rod |
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| Publication Number | Publication Date |
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| CN105755252A true CN105755252A (en) | 2016-07-13 |
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| CN201410771595.0A Pending CN105755252A (en) | 2014-12-13 | 2014-12-13 | Process for heat treatment of tube body of drilling rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604258A (en) * | 2017-08-09 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | Drill pipe body seamless steel pipe and its production method |
-
2014
- 2014-12-13 CN CN201410771595.0A patent/CN105755252A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604258A (en) * | 2017-08-09 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | Drill pipe body seamless steel pipe and its production method |
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Application publication date: 20160713 |