CN106011651A - Super strength seamless steel tube for rotary drilling rig drill pipe and production method thereof - Google Patents
Super strength seamless steel tube for rotary drilling rig drill pipe and production method thereof Download PDFInfo
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- CN106011651A CN106011651A CN201610639912.2A CN201610639912A CN106011651A CN 106011651 A CN106011651 A CN 106011651A CN 201610639912 A CN201610639912 A CN 201610639912A CN 106011651 A CN106011651 A CN 106011651A
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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
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the technical field of seamless steel tubes and provides a super strength seamless steel tube for a rotary drilling rig drill pipe and a production method thereof. The super strength seamless steel tube comprises, by weight, 0.13-0.18% of C, 0.20-0.50% of Si, 1.20-1.70% of Mn, 0.20-0.60% of Cr, 0.15-0.40% of Mo, 0.08-0.25% of Ni, 0.07-0.14% of V, 0.10-0.70% of W and the balance Fe, residual elements and unavoidable impurities. Through adjustment of blank material components of a seamless steel pipe and use of a quenching and tempering treatment technology as a heat treatment technology, the produced seamless steel pipe has good mechanical properties.
Description
Technical field
The invention belongs to seamless steel pipe technical field, particularly to a kind of superhigh intensity drilling machine drilling rod seamless steel pipe
And production method.
Background technology
Rotary drilling rig is the construction machinery of pore-forming operation in a kind of applicable building foundation engineering, is primarily adapted for sand, viscosity
The soil layer constructions such as soil, slity soil, are used widely in the multiple foundation basic constructions such as bored concrete pile, diaphragm wall, strengthening of foundation.
Rotary drilling rig is with its characteristic such as high efficiency, low stain, and oneself becomes domestic railway and bridge on highway pile foundation construction at present
Main construction equipment, and along with the people that adds of national basis construction investment, the demand of rotary drilling rig is increased sharply.
Drilling machine drilling rod is the critical component of rotary drilling rig, and drilling machine drilling rod is combined by several sections of drilling rods, often saves
Drilling rod is made up of seamless steel pipe and the inside and outside driving key that is welded thereon.
Current drilling machine drilling rod seamless steel pipe, typically all uses C, Mn steel in steel grades design, drilling rod
Intensity is low, it is impossible to well meet construction requirement.
Summary of the invention
[solving the technical problem that]
It is an object of the invention to provide a kind of superhigh intensity drilling machine drilling rod seamless steel pipe and production method thereof, with life
Produce a kind of intensity height, good toughness, drilling machine drilling rod seamless steel pipe that welding performance is excellent.
[technical scheme]
The present invention is achieved by the following technical solutions.
Present invention firstly relates to a kind of superhigh intensity drilling machine drilling rod seamless steel pipe, the chemistry one-tenth of described seamless steel pipe
Point be by weight percentage: C 0.13～0.18%, Si 0.20～0.50%, Mn 1.20～1.70%, Cr 0.20～
0.60%, Mo 0.15～0.40%, Ni 0.08～0.25%, V 0.07～0.14%, W 0.10～0.70%, surplus is
Fe, residual elements and inevitable impurity.
As one preferred embodiment, in described residual elements: Cu≤0.20%, Nb≤0.01%, Ti≤
0.035%, B≤0.0005%.
As another preferred embodiment, in described inevitable impurity: P≤0.025%, S≤0.015%.
As another preferred embodiment, described carbon equivalent ceIIW≤ 0.60%, wherein CEIIW=C+Mn/6+ (Cr+
Mo+V)/5+(Ni+Cu)/15.The principal element affecting steel-pipe welding performance is the chemical composition of body material, and wherein chemistry becomes
In point, the impact of phosphorus content alignment welding performance is the most obvious, generally the impact on its welding performance of the alloying element in steel, presses
Its effect is converted into the suitable content of carbon, i.e. evaluates the welding performance of metal material by carbon equivalent method, and carbon equivalent is the lowest, its
Welding performance is the best, and carbon equivalent its welding performance the highest is the poorest, but, while carbon equivalent reduces, the mechanical strength of steel pipe refers to
Mark reduces the most rapidly, therefore, will reduce carbon equivalent as far as possible on the premise of ensureing seamless steel pipe mechanical strength performance indications,
Improve welding performance.The present invention content by preferred alloy element, it is ensured that on the premise of seamless steel pipe has higher intensity,
Its welding performance is the most excellent.
The invention still further relates to the production method of a kind of superhigh intensity drilling machine drilling rod seamless steel pipe, including step:
A, base: obtain continuous casting billet through the cast of electric furnace smelting, LF refining furnace refine, VD application of vacuum and conticaster, step
Rapid A controls continuous casting billet composition and meets the component requirements described in any of the above embodiment；
B, blank pipe roll: by continuous casting billet through annular furnace heating, perforation, finish to gauge tubulation；
C, heat treatment: the blank pipe after rolling step B uses modifier treatment, wherein hardening heat 910～950 DEG C, return
Fire temperature is 660～700 DEG C.
For making seamless steel pipe have required mechanical property, physical property and chemical property, except reasonable selection material and
Outside various forming technologies, Technology for Heating Processing is the most requisite, and in order to strengthen the intensity of seamless steel pipe, the present invention selects to adjust
Matter processes as Technology for Heating Processing, the most first quenches, and hardening heat is 910～950 DEG C, is then tempered, and wherein temperature is 660
～700 DEG C.
As one preferred embodiment, in described step A, the vacuum treated tapping temperature of VD is 1590～1605
℃。
As another preferred embodiment, in described step A, conticaster cast tundish temperature: 1530～
1555℃。
As another preferred embodiment, in described step B, finishing temperature is 850～950 DEG C.
As another preferred embodiment, in described step B, it is 1220～1250 that continuous casting billet goes out annular furnace temperature
℃。
As another preferred embodiment, in the modifier treatment of described step C, the coolant that quenching uses is water,
The type of cooling that tempering uses is air cooling.
[beneficial effect]
The technical scheme that the present invention proposes has the advantages that
The inventive method by adjusting the batch components of seamless steel pipe, and use modifier treatment as Technology for Heating Processing, because of
This seamless steel pipe produced has good mechanical property, its yield strength >=770Mpa；Tensile strength be 820～
1000Mpa；Elongation percentage >=16%；The U-shaped impact flexibility of Charpy: room temperature longitudinally full-scale Charpy-V impact power >=100J, additionally, protecting
Demonstrate,proving on the premise of it has higher intensity, its welding performance is the most excellent.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below by the detailed description of the invention to the present invention
Carry out clear, complete description.
Embodiment 1
Embodiment 1 provides the production method of a kind of superhigh intensity drilling machine drilling rod seamless steel pipe, is used for producing Φ
339.7 × 11mm seamless steel pipe, the method comprises the following steps:
(1), base: through electric furnace smelting, LF refining furnace refine, VD application of vacuum and conticaster cast obtain continuous casting billet,
Continuous casting billet diameter of phi 350mm, wherein the vacuum treated tapping temperature of VD is 1590 DEG C, the tundish temperature of conticaster cast:
1530℃.Step (1) need the percentage by weight controlling continuous casting billet composition meet table 1.
(2), blank pipe rolling: qualified scale Φ 350mm continuous casting billet is heated through annular furnace, is putting into again after perforation
Heating furnace heats, and finally rolling, sizing, finishing and packaging, it is 1220 DEG C that continuous casting billet goes out annular furnace temperature, and finishing temperature is 850
℃。
(3), heat treatment: the blank pipe after rolling step (2) uses modifier treatment, wherein hardening heat 910 DEG C, quenching
The coolant used is water, and temperature is 660 DEG C, and the type of cooling that tempering uses is air cooling.The present embodiment selects quenched place
Reason, as Technology for Heating Processing, the most first quenches, and hardening heat is 910 DEG C, is then tempered, and wherein temperature is 660 DEG C, by adjusting
Matter processes, and can strengthen the intensity of product.
The mechanical property of the product that the method in embodiment 1 is produced sees table 2.
Embodiment 2
Embodiment 2 provides the production method of a kind of superhigh intensity drilling machine drilling rod seamless steel pipe, is used for producing Φ
339.7 × 11mm seamless steel pipe, the method comprises the following steps:
(1), base: through electric furnace smelting, LF refining furnace refine, VD application of vacuum and conticaster cast obtain continuous casting billet,
Continuous casting billet diameter of phi 350mm, wherein the vacuum treated tapping temperature of VD is 1605 DEG C, the tundish temperature of conticaster cast:
1555℃.Step (1) need the percentage by weight controlling continuous casting billet composition meet table 1.
(2), blank pipe rolling: qualified scale Φ 350mm continuous casting billet is heated through annular furnace, is putting into again after perforation
Heating furnace heats, and finally rolling, sizing, finishing and packaging, it is 1250 DEG C that continuous casting billet goes out annular furnace temperature, and finishing temperature is 950
℃。
(3), heat treatment: the blank pipe after rolling step (2) uses modifier treatment, wherein hardening heat 950 DEG C, quenching
The coolant used is water, and temperature is 660～700 DEG C, and the type of cooling that tempering uses is air cooling.The present embodiment selects to adjust
Matter processes as Technology for Heating Processing, the most first quenches, and hardening heat is 950 DEG C, is then tempered, and wherein temperature is 700 DEG C, logical
Cross modifier treatment, the intensity of product can be strengthened.
Embodiment 3
Embodiment 3 provides the production method of a kind of superhigh intensity drilling machine drilling rod seamless steel pipe, is used for producing Φ
339.7 × 11mm seamless steel pipe, the method comprises the following steps:
(1), base: through electric furnace smelting, LF refining furnace refine, VD application of vacuum and conticaster cast obtain continuous casting billet,
Continuous casting billet diameter of phi 350mm, wherein the vacuum treated tapping temperature of VD is 1600 DEG C, the tundish temperature of conticaster cast:
1550℃.Step (1) need the percentage by weight controlling continuous casting billet composition meet table 1.
(2), blank pipe rolling: qualified scale Φ 350mm continuous casting billet is heated through annular furnace, is putting into again after perforation
Heating furnace heats, and finally rolling, sizing, finishing and packaging, it is 1230 DEG C that continuous casting billet goes out annular furnace temperature, and finishing temperature is 900
℃。
(3), heat treatment: the blank pipe after rolling step (2) uses modifier treatment, wherein hardening heat 930 DEG C, quenching
The coolant used is water, and temperature is 680 DEG C, and the type of cooling that tempering uses is air cooling.The present embodiment selects quenched place
Reason, as Technology for Heating Processing, the most first quenches, and hardening heat is 930 DEG C, is then tempered, and wherein temperature is 680 DEG C, by adjusting
Matter processes, and can strengthen the intensity of product.
Embodiment 4
Embodiment 4 provides the production method of a kind of superhigh intensity drilling machine drilling rod seamless steel pipe, is used for producing Φ
339.7 × 11mm seamless steel pipe, the method comprises the following steps:
(1), base: through electric furnace smelting, LF refining furnace refine, VD application of vacuum and conticaster cast obtain continuous casting billet,
Continuous casting billet diameter of phi 350mm, wherein the vacuum treated tapping temperature of VD is 1605 DEG C, the tundish temperature of conticaster cast:
1555℃.Step (1) need the percentage by weight controlling continuous casting billet composition meet table 1.
(2), blank pipe rolling: qualified scale Φ 350mm continuous casting billet is heated through annular furnace, is putting into again after perforation
Heating furnace heats, and finally rolling, sizing, finishing and packaging, it is 1250 DEG C that continuous casting billet goes out annular furnace temperature, and finishing temperature is 950
℃。
(3), heat treatment: the blank pipe after rolling step (2) uses modifier treatment, wherein hardening heat 950 DEG C, quenching
The coolant used is water, and temperature is 700 DEG C, and the type of cooling that tempering uses is air cooling.The present embodiment selects quenched place
Reason, as Technology for Heating Processing, the most first quenches, and hardening heat is 950 DEG C, is then tempered, and wherein temperature is 700 DEG C, by adjusting
Matter processes, and can strengthen the intensity of product.
Table 1 is the percentage by weight of the chemical composition of continuous casting billet, wherein CEV=C+Mn/6+ (Cr+Mo+ in each embodiment
V)/5+(Ni+Cu)/15。
Chemical composition % of continuous casting billet in each embodiment of table 1
| Embodiment is numbered | C | Si | Mn | P | S | Cr | V | Mo | Ni | Cu | Ti | B | W | CEV |
| 1 | 0.15 | 0.50 | 1.39 | 0.011 | 0.008 | 0.24 | 0.14 | 0.18 | 0.25 | 0.05 | 0.029 | 0.0002 | 0.13 | 0.51 |
| 2 | 0.17 | 0.37 | 1.25 | 0.015 | 0.006 | 0.41 | 0.07 | 0.28 | 0.15 | 0.06 | 0.022 | 0.0003 | 0.46 | 0.54 |
| 3 | 0.14 | 0.33 | 1.45 | 0.014 | 0.004 | 0.43 | 0.096 | 0.40 | 0.14 | 0.03 | 0.021 | 0.0003 | 0.47 | 0.58 |
| 4 | 0.13 | 0.22 | 1.64 | 0.012 | 0.012 | 0.55 | 0.07 | 0.15 | 0.08 | 0.06 | 0.033 | 0.0003 | 0.7 | 0.57 |
Table 2 is the mechanical property of the product that the method in embodiment 1 to embodiment 4 is produced.
Table 2 Φ 315 × 15mm product mechanical property
From table 2 it can be seen that the seamless steel pipe that each embodiment is produced is respectively provided with good mechanical property, its surrender is strong
Degree >=770Mpa；Tensile strength is 820～1000Mpa；Elongation percentage >=16%；The U-shaped impact flexibility of Charpy: room temperature is the most full-scale
Charpy-V impact power >=100J, additionally, on the premise of ensureing that it has higher intensity, its welding performance is the most excellent.
It is to be appreciated that the embodiment of foregoing description is a part of embodiment of the present invention rather than whole embodiment, the most not
It it is limitation of the present invention.Based on embodiments of the invention, those of ordinary skill in the art are not paying creative work premise
Lower obtained every other embodiment, broadly falls into protection scope of the present invention.
Claims (10)
1. a superhigh intensity drilling machine drilling rod seamless steel pipe, it is characterised in that the chemical composition of described seamless steel pipe is with weight
Amount percentages is: C 0.13～0.18%, Si 0.20～0.50%, Mn 1.20～1.70%, Cr 0.20～0.60%,
Mo 0.15～0.40%, Ni 0.08～0.25%, V 0.07～0.14%, W 0.10～0.70%, surplus is Fe, remaining unit
Plain and inevitable impurity.
Superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 1, it is characterised in that described remaining unit
In element: Cu≤0.20%, Nb≤0.01%, Ti≤0.035%, B≤0.0005%.
Superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 1 and 2, it is characterised in that described can not
In the impurity avoided: P≤0.025%, S≤0.015%.
Superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 2, it is characterised in that described carbon equivalent
CEIIW≤ 0.60%, wherein CEIIW=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
5. the production method of a superhigh intensity drilling machine drilling rod seamless steel pipe, it is characterised in that include step:
A, base: obtain continuous casting billet, in step A through the cast of electric furnace smelting, LF refining furnace refine, VD application of vacuum and conticaster
Control continuous casting billet composition and meet arbitrary described component requirements in Claims 1-4；
B, blank pipe roll: by continuous casting billet through annular furnace heating, perforation, finish to gauge tubulation；
C, heat treatment: the blank pipe after rolling step B uses modifier treatment, wherein hardening heat 910～950 DEG C, tempering temperature
Degree is 660～700 DEG C.
The production method of superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 5, it is characterised in that
In described step A, the vacuum treated tapping temperature of VD is 1590～1605 DEG C.
The production method of superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 5, it is characterised in that
In described step A, the tundish temperature of conticaster cast: 1530～1555 DEG C.
The production method of superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 5, it is characterised in that
In described step B, finishing temperature is 850～950 DEG C.
The production method of superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 5, it is characterised in that
In described step B, it is 1220～1250 DEG C that continuous casting billet goes out annular furnace temperature.
The production method of superhigh intensity drilling machine drilling rod seamless steel pipe the most according to claim 5, it is characterised in that
In described modifier treatment, the coolant that quenching uses is water, and the type of cooling that tempering uses is air cooling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610639912.2A CN106011651A (en) | 2016-08-05 | 2016-08-05 | Super strength seamless steel tube for rotary drilling rig drill pipe and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610639912.2A CN106011651A (en) | 2016-08-05 | 2016-08-05 | Super strength seamless steel tube for rotary drilling rig drill pipe and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660371A (en) * | 2018-03-27 | 2018-10-16 | 衡阳华菱连轧管有限公司 | Steel pipe, its raw material, its production method and rotary drilling rig drilling rod |
| CN109097707A (en) * | 2018-09-07 | 2018-12-28 | 无锡华贝钢管制造有限公司 | A kind of 130KSI intensity low temperature cantilever crane seamless steel pipe and preparation process |
| CN110408862A (en) * | 2019-08-19 | 2019-11-05 | 衡阳华菱钢管有限公司 | Seamless steel pipe, manufacturing method and its application |
| CN113106347A (en) * | 2021-04-13 | 2021-07-13 | 无锡恒丰祥钢管科技有限公司 | High-temperature-resistant seamless steel tube and preparation method thereof |
| CN115747635A (en) * | 2022-10-11 | 2023-03-07 | 天津钢管制造有限公司 | Economical high-strength quenched and tempered thin-wall seamless steel tube for inner layer rod of rotary drilling rod |
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| CN101054649A (en) * | 2007-03-29 | 2007-10-17 | 攀钢集团成都钢铁有限责任公司 | Sulfur erosion resisting steel and smelting method thereof |
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| JPH09118919A (en) * | 1995-10-26 | 1997-05-06 | Sumitomo Metal Ind Ltd | Manufacture of steel product excellent in seawater corrosion resistance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660371A (en) * | 2018-03-27 | 2018-10-16 | 衡阳华菱连轧管有限公司 | Steel pipe, its raw material, its production method and rotary drilling rig drilling rod |
| CN109097707A (en) * | 2018-09-07 | 2018-12-28 | 无锡华贝钢管制造有限公司 | A kind of 130KSI intensity low temperature cantilever crane seamless steel pipe and preparation process |
| CN110408862A (en) * | 2019-08-19 | 2019-11-05 | 衡阳华菱钢管有限公司 | Seamless steel pipe, manufacturing method and its application |
| CN113106347A (en) * | 2021-04-13 | 2021-07-13 | 无锡恒丰祥钢管科技有限公司 | High-temperature-resistant seamless steel tube and preparation method thereof |
| CN115747635A (en) * | 2022-10-11 | 2023-03-07 | 天津钢管制造有限公司 | Economical high-strength quenched and tempered thin-wall seamless steel tube for inner layer rod of rotary drilling rod |
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