CN100467205C - Production of L80-13Cr oil casings - Google Patents
Production of L80-13Cr oil casings Download PDFInfo
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- CN100467205C CN100467205C CNB2005100302943A CN200510030294A CN100467205C CN 100467205 C CN100467205 C CN 100467205C CN B2005100302943 A CNB2005100302943 A CN B2005100302943A CN 200510030294 A CN200510030294 A CN 200510030294A CN 100467205 C CN100467205 C CN 100467205C
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- pipe
- nitrogen
- heat treatment
- heating
- quenching
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 63
- 238000010791 quenching Methods 0.000 claims abstract description 22
- 230000000171 quenching effect Effects 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000005496 tempering Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 54
- 229910052757 nitrogen Inorganic materials 0.000 claims description 27
- 230000011218 segmentation Effects 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000000137 annealing Methods 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000005098 hot rolling Methods 0.000 abstract description 7
- 238000005520 cutting process Methods 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910052742 iron Inorganic materials 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 238000005554 pickling Methods 0.000 description 8
- 238000005336 cracking Methods 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
A technology for manufacturing the L80-13Cr sleeve pipe used to deliver oil includes such steps as heating pipe blank by radiation pipe, hot rolling, cooling, quenching in air under the protection of N2, tempering, cooling in air, straightening, cutting for removing head and tail and dividing the pipe into pipe segments, and post-treating.
Description
Technical field
The present invention relates to the steel tube manufacture technique technology, particularly L80-13Cr tubing and casing manufacturing process.
Background technology
The L80-13Cr tubing and casing is grade of steel and the product of stipulating in the API SPEC 5CT of the American Petroleum Institute (API) standard, and its chemical analysis requires to see Table 1, and mechanical performance requires to see Table 2.The L80-13Cr tubing and casing reaches 13% seamless stainless steel pipe for evanohm content, and the production difficulty is very big, and Baosteel is that domestic first produced the producer of L80-13Cr tubing and casing.
Table 1:L80-13Cr chemical analysis
The requirement of table 2:L80-13Cr mechanical performance
Existing tubing and casing manufacturing process flow:
Pipe → heating of pipe blank → hot finished steel pipe → cold bed → pipe aligning → crop end, the modified heat treatment → pickling of segmentation → oil quenching or ball blast → other following process operations are as: nondestructive inspection → pipe TBE → end protection ring on box cupling → internal and external threads of screwing on.Manufacturing process flow adopts the tubing and casing general process scheme.
The problem that existing tubing and casing manufacturing process technology exists:
(1), pipe aligning cracking.
L80-13Cr tubing and casing chrome content height, behind the hot rolling and air cooling, metallographic structure is a martensite, pipe is hard especially, the intensity height, therefore poor toughness, is easy to cracking during the pipe aligning.
(2), pipe crop end and segmentation be difficult, production can not normally be carried out.
The pipe that hot rolling is got off is generally double chi length, and promptly two of production tube length times, and the modified heat-treatment furnace of oil quenching is a walking beam heating furnace, can only be by single multiple lengths heat treatment, so essential crop end and segmentation before the pipe heat treatment.Because above-mentioned same, pipe crop end and segmentation are difficult, all being difficult to sawing with the carbide alloy saw must move, not only the sawing time long, and otch out-of-flatness, jagged, the saw blade loss is many, has a strong impact on normally carrying out of production.
(3), after the pipe heat treatment, the inner surface oxidation is serious, need carry out pickling or bead, to remove iron scale.
The L80-13Cr oil annular tube is in containing CO
2The oil gas well of sour corrosion medium, very high to the quality requirement of inner surface of tube, API 5CT standard has been done particular provisions to this, i.e. " inner surface of tube is answered the non-oxidation iron sheet after final heat treatment ".
The conventional Technology for Heating Processing of L80-13Cr tubing and casing adopts the modified heat treatment of oil quenching, the Baosteel steel tube factory carries out the modified heat treatment of oil quenching on the modified heat treatment unit of oil well pipe, adopt coal gas or direct combustion heating pipe of natural gas, the heating furnace atmosphere is little reducing atmosphere, and L80-13Cr 88.9 * 6.45 oil pipe oil quenching heat treating regimes see Table 3.
The weak point of this technology is pipe oxidation easily in stove, and the pipe surfaces externally and internally has apparent in view iron scale, and particularly mechanical performance is defective after heat treatment first, and when needing heat treatment again, scale on surface can be more serious.The outer tube surface iron scale can be removed by thermal straightening, and the inner surface of tube iron scale is removed very difficult, generally adopts pickling or ball blast to remove.
Table 3:L80-13Cr88.9 * 6.45 oil pipe oil quenching heat treating regimes
Summary of the invention
The objective of the invention is to propose a kind of manufacturing process of L80-13Cr tubing and casing, at first on the bright annealing furnace of band nitrogen protection, carry out modified heat treatment after the hot rolling of L80-13Cr steel pipe, because obdurability improves, pipe aligning, crop, segmentation can be carried out smoothly, and pipe aligning cracking and the motionless situation of sawing can not take place; Simultaneously, owing to the modified heat treatment of pipe is all carried out under nitrogen protection, so the oxidation of pipe surfaces externally and internally is slight, and table just can save pickling or Shot Blasting in the pipe, reduces production costs.
For achieving the above object, technical scheme of the present invention is,
The manufacturing process of L80-13Cr tubing and casing, its step is as follows:
A) heating of pipe blank, hot finished steel pipe;
B) cold bed cooling;
C) the modified heat treatment of air quenching, the modified heat treatment of air quenching are to carry out on the bright annealing furnace of band nitrogen protection, and the nitrogen cooling is all carried out under nitrogen protection after promptly quench heating, nitrogen quenching, tempering heating, the tempering; Hardening heat: 960-1020 ℃; Temperature retention time: 20-30 minute; Hardening media: nitrogen; Temperature: 680-740 ℃; Temperature retention time: 40-60 minute; The nitrogen cooling;
D) subsequent handlings such as pipe aligning, crop end, segmentation.
Wherein, add the heating of thermal recovery radiant tube.
Keep malleation with nitrogen pressure in the heat treatment heating furnace.
The manufacturing process of L80-13Cr tubing and casing: the modified heat treatment of pipe → heating of pipe blank → hot finished steel pipe → cold bed → air quenching → pipe aligning → crop end, segmentation → other following process operations.
Wherein, after the hot rolling of L80-13Cr steel pipe; at first on the bright annealing furnace of band nitrogen protection, carry out the nitrogen modified heat treatment of quenching; bright annealing furnace is the roller-bottom type continuous furnace; allowing the maximum length of heat treatment pipe is 21 meters; be two multiple lengths of production tube, so pipe can first heat treatment, and then align, crop end, segmentation.Hot-rolled pipe after heat treatment, intensity reduces, toughness increases, therefore, pipe aligning, crop end, segmentation can be carried out smoothly, and pipe aligning cracking and the motionless situation of sawing can not take place.
During L80-13Cr tubing and casing heat treatment heating, do not have in stove under the situation of protective gas, tube surface is easy to generate iron scale; If nitrogen protection is arranged in the stove, the iron of tube surface just can not react with oxygen, generates iron scale, and inner surface of tube just can save pickling or Shot Blasting.
The present invention adopts the bright annealing furnace of band nitrogen protection to carry out the modified heat treatment of air quenching; the nitrogen cooling is all carried out under nitrogen protection after quenching heating, nitrogen quenching, tempering heating, the tempering; heat with radiant tube; therefore the inner surface of tube oxidation is slight, and inner surface no longer needs to carry out pickling or Shot Blasting.After the heat treatment, the oxidation of pipe surfaces externally and internally is slight, and mechanical performance and hardness satisfy API 5CT standard code.
The difference of the present invention and prior art:
1. manufacturing process flow difference
Modified heat treatment is carried out in necessary first aligning, crop end, segmentation then after the hot rolling of prior art steel pipe, because the hot-rolled pipe metallographic structure is a martensite, pipe is hard and crisp, causes the aligning cracking, and crop end and billet-sawn are difficult, the otch out-of-flatness, jagged, the saw blade loss is many;
Modified heat treatment earlier after the steel pipe hot rolling of the present invention, aligning, crop end, segmentation then, hot finished steel pipe is after modified heat treatment, and intensity reduces, and toughness increases, and therefore, pipe aligning, crop, segmentation can be carried out smoothly, get twice the result with half the effort.
2. heat treatment heating furnace furnace atmosphere difference, the inner surface of tube quality is also different after the heat treatment
The prior art heat treatment heating furnace can't use protective gas in the stove, so the pipe surfaces externally and internally is of poor quality with coal gas or direct heating tube of natural gas, and oxidation is serious;
Heat treatment heating furnace of the present invention adopts radiant tube heating pipe, uses nitrogen protection in the stove, and nitrogen pressure keeps pressure-fired, prevents the infiltration of stove outer air, and therefore, pipe surfaces externally and internally quality is good, hardly can oxidation.
3. tube surface processing mode difference after the modified heat treatment
The inner surface of tube iron scale is serious after the modified heat treatment of prior art, must remove complex process by pickling or bead;
The inner surface oxidation is slight after the modified heat treatment of the present invention, do not need to remake any processing, work simplification.
Beneficial effect of the present invention
The present invention can guarantee the L80-13Cr tubing and casing after the modified heat treatment of air quenching, and mechanical performance and hardness satisfy API 5CT standard code, and the oxidation of pipe surfaces externally and internally is slight, and inner surface needn't carry out pickling or Shot Blasting again, and production technology is simplified, cost decreases.
The specific embodiment
Be fabricated to example with L80-13Cr 127 * 9.19 sleeve pipes, the modified heat treatment of pipe → heating of pipe blank → hot finished steel pipe → cold bed → air quenching → pipe aligning → crop end, the segmentation → nondestructive inspection → pipe TBE → end protection ring on box cupling → internal and external threads of screwing on.
Its heat treating regime sees Table 4, and mechanical performance sees Table 5.
Table 4: heat treating regime
Table 5: mechanical performance
| Embodiment | Yield strength MPa | Tensile strength MPa | Percentage elongation % | L-5 * 10-0 ℃ of Charpy-V impact power J |
| 1 | 650 | 845 | 26.0 | 63 |
| 2 | 620 | 815 | 27 | 63 |
| 3 | 570 | 790 | 28 | 68 |
Claims (3)
1.L80-13Cr the manufacturing process of tubing and casing, its step is as follows:
A) heating of pipe blank, hot finished steel pipe;
B) cold bed cooling;
C) the nitrogen modified heat treatment of quenching, the nitrogen modified heat treatment of quenching is to carry out on the bright annealing furnace of band nitrogen protection, and nitrogen cools off and all carries out under nitrogen protection after promptly quench heating, nitrogen quenching, tempering heating, the tempering; Hardening heat: 960-1020 ℃; Temperature retention time: 20-30 minute; Hardening media: nitrogen; Temperature: 680-740 ℃; Temperature retention time: 40-60 minute; The nitrogen cooling;
D) subsequent handlings such as pipe aligning, crop end, segmentation.
2. the manufacturing process of L80-13Cr tubing and casing as claimed in claim 1 is characterized in that, adds the heating of thermal recovery radiant tube.
3. the manufacturing process of L80-13Cr tubing and casing as claimed in claim 1 is characterized in that, keeps malleation with nitrogen pressure in the bright annealing furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100302943A CN100467205C (en) | 2005-09-30 | 2005-09-30 | Production of L80-13Cr oil casings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100302943A CN100467205C (en) | 2005-09-30 | 2005-09-30 | Production of L80-13Cr oil casings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1939656A CN1939656A (en) | 2007-04-04 |
| CN100467205C true CN100467205C (en) | 2009-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100302943A Active CN100467205C (en) | 2005-09-30 | 2005-09-30 | Production of L80-13Cr oil casings |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103045835A (en) * | 2011-10-17 | 2013-04-17 | 宝山钢铁股份有限公司 | Manufacturing method of L80-13Cr oil pipes |
| CN102517515B (en) * | 2011-12-29 | 2013-09-18 | 天津市无缝钢管厂 | Phi 177.8*9.19 seamless steel pipe with high steel grade for petroleum and manufacturing method |
| CN102921749B (en) * | 2012-11-30 | 2015-03-04 | 攀钢集团成都钢钒有限公司 | Method for removing surface scale of chromium-containing seamless steel tube |
| CN105834674B (en) * | 2015-01-15 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of manufacture method of machine for casing tube with special through diameter |
| CN107058688A (en) * | 2017-06-21 | 2017-08-18 | 合肥博创机械制造有限公司 | A kind of drill pipe body heat treatment method |
| CN110079657B (en) * | 2019-05-17 | 2024-01-26 | 东台艺新金属材料有限公司 | Gas mixing and feeding device in saw blade tempering furnace |
| CN112111641A (en) * | 2020-09-29 | 2020-12-22 | 邯郸新兴特种管材有限公司 | Heat treatment method of thick-wall L80-13Cr seamless steel tube |
-
2005
- 2005-09-30 CN CNB2005100302943A patent/CN100467205C/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 无缝钢管生产. 千学义.江西冶金，第17卷第5期. 1997 |
| 无缝钢管生产. 千学义.江西冶金，第17卷第5期. 1997 * |
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| CN1939656A (en) | 2007-04-04 |
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