CN101705426B - Drill collar steel and dehydrogenated heat treatment process thereof for improving ultrasonic flaw detection qualification rate - Google Patents
Drill collar steel and dehydrogenated heat treatment process thereof for improving ultrasonic flaw detection qualification rate Download PDFInfo
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- CN101705426B CN101705426B CN2009102630211A CN200910263021A CN101705426B CN 101705426 B CN101705426 B CN 101705426B CN 2009102630211 A CN2009102630211 A CN 2009102630211A CN 200910263021 A CN200910263021 A CN 200910263021A CN 101705426 B CN101705426 B CN 101705426B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P10/00—Technologies related to metal processing
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Abstract
The invention relates to a process for producing a drill collar steel, and discloses a drill collar steel and a dehydrogenated heat treatment process thereof for improving ultrasonic flaw detection qualification rate. The drill collar steel comprises the following components in percentage by weight: 0.44 to 0.48 percent of C, 1.00 to 1.20 percent of Cr, 1.00 to 1.20 percent of Mn, 0.20 to 0.30 percent of Si, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.025 to 0.035 percent of Al, and the balance of Fe and inevitable impurities. The dehydrogenated heat treatment process increases 710 DEG C high-temperature dehydrogenation, uses the advantage of high high-temperature dehydrogenation speed to increase the dehydrogenation speed and quickly reduce the content of hydrogen in the steel, and adopts 650 DEG C intermediate temperature to further dehydrogenate based on 710 DEG C high-temperature dehydrogenation so as to keep the content of the hydrogen in the steel in a lower level. The process can further reduce the content of the hydrogen in the steel, reduce the detection defect size caused by white points, and enables the drill collar steel to meet the ultrasonic flaw detection precision of phi 1.6mm equivalent weight.
Description
Technical field
The invention belongs to field of metallurgy, relate to the production technique of drill collar steel, the dehydrogenated heat treatment process of a kind of specifically drill collar steel and raising ultrasonic flaw detection qualification rate thereof.
Background technology
The steel that are used to make stone oil drill collar are generally CrMnMo class steel alloy, representing steel grade is AISI4145H, but the low multiple quality of this class steel is very easy to " white point " defective takes place, and " white point " defective can cause UT (Ultrasonic Testing) defective again, thereby causes the drill collar steel lumber recovery to descend.The measure of the solution white point that tradition adopts is: reduce hydrogen richness in the molten steel+dehydrogenation in time, the dehydrogenated heat treatment process of employing adopts 680 ℃ of middle-temperature sections to carry out dehydrogenation as shown in Figure 1, and soaking time is 16 hours.Adopt the susceptibility and the rank that can reduce white point really of Fig. 1 dehydrogenated heat treatment process, but still there is certain tiny flaw in steel, still has certain flaw echo to exist during UT (Ultrasonic Testing), the flaw echo size generally is no more than Φ 2mm equivalent.
Along with of the raising of drill collar production to drill collar flaw detection specification of quality, part drill collar manufacturers brings up to Φ 1.6mm equivalent with the drill collar precision of detecting a flaw from Φ 2mm equivalent, adopt the drill collar steel of present dehydrogenated heat treatment process production to be difficult to satisfy Φ 1.6mm equivalent UT (Ultrasonic Testing) precision, the defective ratio of detecting a flaw increases.
Summary of the invention
Technical problem to be solved by this invention is: at the shortcoming of above prior art existence, the dehydrogenated heat treatment process of a kind of drill collar steel and raising ultrasonic flaw detection qualification rate thereof is proposed, can further reduce hydrogen richness in the steel, reduce the flaw detection defect size that white point causes, make drill collar steel can satisfy the normal UT (Ultrasonic Testing) precision of Φ 1.6mm.
The technical scheme that the present invention solves above technical problem is:
A kind of drill collar steel, per-cent comprises following composition: C:0.44%～0.48% during by weight, Cr:1.00%～1.20%, Mn:1.00%～1.20%, Si:0.20%～0.30%, P :≤0.020%, S :≤0.020%, Al:0.025%～0.035%, surplus are Fe and unavoidable impurities.
A kind of dehydrogenated heat treatment process that improves the drill collar steel ultrasonic flaw detection qualification rate carries out the high temperature section dehydrogenation earlier, carries out the middle-temperature section dehydrogenation again; The temperature of high temperature section dehydrogenation is 710 ℃ ± 10 ℃, and soaking time is 12～12.5 hours, utilizes the fireballing advantage of high temperature section dehydrogenation, increases dehydrogenation speed, reduces the hydrogen richness in the steel fast; It is cold that the high temperature section dehydrogenation finishes the back stove; The temperature of middle-temperature section dehydrogenation is 650 ℃ ± 10 ℃, and soaking time is 4～4.5 hours, adopts the further dehydrogenation of middle-temperature section, makes that hydrogen richness is in lower level in the steel; The air cooling of coming out of the stove after the middle-temperature section dehydrogenation finishes.
The heat-up rate of high temperature section dehydrogenation is: heat-up rate≤100 ℃/hour
The present invention increases by 710 ℃ of high temperature section dehydrogenations by improved thermal treatment process, utilizes the fireballing advantage of high temperature section dehydrogenation, increases dehydrogenation speed, reduces the hydrogen richness in the steel fast; On 710 ℃ of high temperature section dehydrogenation bases, adopt 650 ℃ of further dehydrogenations of middle-temperature section, make that hydrogen richness is in lower level in the steel.Can further reduce hydrogen richness in the steel, reduce the flaw detection defect size that white point causes, make drill collar steel can satisfy the normal UT (Ultrasonic Testing) precision of Φ 1.6mm.
Description of drawings
Fig. 1 is existing drill collar steel dehydrogenated heat treatment process schema.
Fig. 2 is a schema of the present invention.
Embodiment
Embodiment one
The dehydrogenated heat treatment process of the raising drill collar steel ultrasonic flaw detection qualification rate of present embodiment carries out the high temperature section dehydrogenation earlier as shown in Figure 2, carries out the middle-temperature section dehydrogenation again; The temperature of high temperature section dehydrogenation is 700 ℃, and soaking time is 12 hours, utilizes the fireballing advantage of high temperature section dehydrogenation, increases dehydrogenation speed, reduces the hydrogen richness in the steel fast; It is cold that the high temperature section dehydrogenation finishes the back stove; The temperature of middle-temperature section dehydrogenation is 640 ℃, and soaking time is 4 hours, adopts the further dehydrogenation of middle-temperature section, makes that hydrogen richness is in lower level in the steel; The air cooling of coming out of the stove after the middle-temperature section dehydrogenation finishes.
Embodiment two
The dehydrogenated heat treatment process of the raising drill collar steel ultrasonic flaw detection qualification rate of present embodiment carries out the high temperature section dehydrogenation earlier as shown in Figure 2, carries out the middle-temperature section dehydrogenation again; The temperature of high temperature section dehydrogenation is 710 ℃, and soaking time is 12.2 hours, utilizes the fireballing advantage of high temperature section dehydrogenation, increases dehydrogenation speed, reduces the hydrogen richness in the steel fast; It is cold that the high temperature section dehydrogenation finishes the back stove; The temperature of middle-temperature section dehydrogenation is 650 ℃, and soaking time is 4.3 hours, adopts the further dehydrogenation of middle-temperature section, makes that hydrogen richness is in lower level in the steel; The air cooling of coming out of the stove after the middle-temperature section dehydrogenation finishes.
Embodiment three
The dehydrogenated heat treatment process of the raising drill collar steel ultrasonic flaw detection qualification rate of present embodiment carries out the high temperature section dehydrogenation earlier as shown in Figure 2, carries out the middle-temperature section dehydrogenation again; The temperature of high temperature section dehydrogenation is 720 ℃, and soaking time is 12.5 hours, utilizes the fireballing advantage of high temperature section dehydrogenation, increases dehydrogenation speed, reduces the hydrogen richness in the steel fast; It is cold that the high temperature section dehydrogenation finishes the back stove; The temperature of middle-temperature section dehydrogenation is 660 ℃, and soaking time is 4.5 hours, adopts the further dehydrogenation of middle-temperature section, makes that hydrogen richness is in lower level in the steel; The air cooling of coming out of the stove after the middle-temperature section dehydrogenation finishes.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (2)
1. dehydrogenated heat treatment process that improves the drill collar steel ultrasonic flaw detection qualification rate, described drill collar steel comprises following composition: C:0.44%～0.48% by weight percentage, Cr:1.00%～1.20%, Mn:1.00%～1.20%, Si:0.20%～0.30%, P :≤0.020%, S :≤0.020%, Al:0.025%～0.035%, surplus are Fe and unavoidable impurities;
It is characterized in that: carry out the high temperature section dehydrogenation earlier, carry out the middle-temperature section dehydrogenation again; The temperature of described high temperature section dehydrogenation is 710 ℃ ± 10 ℃, and soaking time is 12～12.5 hours; It is cold that described high temperature section dehydrogenation finishes the back stove; The temperature of described middle-temperature section dehydrogenation is 650 ℃ ± 10 ℃, and soaking time is 4～4.5 hours; The air cooling of coming out of the stove after described middle-temperature section dehydrogenation finishes.
2. the dehydrogenated heat treatment process of raising drill collar steel ultrasonic flaw detection qualification rate as claimed in claim 1 is characterized in that: heat-up rate≤100 ℃/hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102630211A CN101705426B (en) | 2009-12-15 | 2009-12-15 | Drill collar steel and dehydrogenated heat treatment process thereof for improving ultrasonic flaw detection qualification rate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102630211A CN101705426B (en) | 2009-12-15 | 2009-12-15 | Drill collar steel and dehydrogenated heat treatment process thereof for improving ultrasonic flaw detection qualification rate |
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| Publication Number | Publication Date |
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| CN101705426A CN101705426A (en) | 2010-05-12 |
| CN101705426B true CN101705426B (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102630211A Expired - Fee Related CN101705426B (en) | 2009-12-15 | 2009-12-15 | Drill collar steel and dehydrogenated heat treatment process thereof for improving ultrasonic flaw detection qualification rate |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561477A (en) * | 2015-01-04 | 2015-04-29 | 南京钢铁股份有限公司 | Steel plate stacking and slow-cooling method for improving flaw detection qualification rate of medium plates |
| CN107815615A (en) * | 2017-09-28 | 2018-03-20 | 山西风雷钻具有限公司 | Low-temperature high impact drill collar |
| CN112226684A (en) * | 2020-09-24 | 2021-01-15 | 南京钢铁股份有限公司 | Drill collar steel |
| CN112538561B (en) * | 2020-11-19 | 2023-06-06 | 河南科技大学 | Periodic dehydrogenation annealing method for large forging |
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2009
- 2009-12-15 CN CN2009102630211A patent/CN101705426B/en not_active Expired - Fee Related
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