CN103194680B - The preparation method of X level drill pipe body weldless steel tube - Google Patents
The preparation method of X level drill pipe body weldless steel tube Download PDFInfo
- Publication number
- CN103194680B CN103194680B CN201310146591.9A CN201310146591A CN103194680B CN 103194680 B CN103194680 B CN 103194680B CN 201310146591 A CN201310146591 A CN 201310146591A CN 103194680 B CN103194680 B CN 103194680B
- Authority
- CN
- China
- Prior art keywords
- pipe body
- drill pipe
- steel
- steel tube
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Abstract
The invention discloses a kind of preparation method of X level drill pipe body weldless steel tube, comprise steelmaking process, steel the operation of rolling and roll state steel heat treatment process.The X level drill pipe body weldless steel tube to the performance requriements of X level drill pipe body in American Petroleum Institute (API) drilling rod specification API Spec 5DP can be met by technical scheme of the present invention.
Description
Technical field
The present invention relates to metallurgical technology field, specifically, relate to a kind of preparation method of X level drill pipe body weldless steel tube.
Background technology
Oil, Sweet natural gas are important source material and the fuel of the industry such as traffic, aviation, metallurgy, chemical industry, are one of closely bound up energy substances of people's lives, play a part very important to the development of national economy.And drilling rod is requisite important workpiece in oilfield prospecting developing, according to statistics, China consumes about 7 ~ 100,000 tons, drilling rod every year.
Drilling rod is connected to the lower end of square kelly, plays the effect of transmitting power slurry conveyed.Along with drilling well is constantly deepened, drilling rod constantly lengthens drill string one by one, and the flushing fluid of high pressure flows to shaft bottom by drill pipe bore simultaneously.When drilling well, drilling rod subjects the effect of the various repeated stresses such as stretching, compression, torsion, bending and impact, and its endoporus is also subject to washing away of high-pressure slurry and corrodes, and operating mode is very complicated, and working conditions is very severe.In American Petroleum Institute (API) drilling rod specification API Spec 5DP, drilling rod is divided into E, X, G, S tetra-grade of steels, wherein X, G, S level drilling rod belongs to high strength level drilling rod.Along with the development of exploration of oil and gas field technology, meeting under different drilling condition conditions, to reduce cost of development for principle, the key that choice for use material is excellent, the rational economical drilling rod of superior performance, production technology process is exploitation of oil-gas field maximization of economic benefit, will have wide market development prospect.
Summary of the invention
Technical solution problem of the present invention is to provide a kind of preparation method of X level drill pipe body weldless steel tube, can produce and meet the weldless steel tube of petroleum drilling industry to the demand of X level drill pipe body.
Technical scheme of the present invention is as follows:
A preparation method for X level drill pipe body weldless steel tube, comprising: the operation of rolling of steelmaking process, steel and roll state steel heat treatment process; The operation of rolling of described steel comprises: circle base heating, perforation, tube rolling, a tube reducing or sizing, cold bed cooling, sawing, aligning, flaw detection, hand inspection, survey are grown, weigh, sprayed and mark and put in storage; The temperature of described round base heating is 1250 DEG C ~ 1300 DEG C, and the rolling temperature of described tube rolling is 1050 DEG C ~ 1100 DEG C; Described state steel heat treatment process of rolling comprises: Quench and temper; The temperature of described quenching is 880 DEG C ~ 920 DEG C, soaking time >=40 minute, and quenchant is water, and the temperature of described tempering is 680 DEG C ~ 720 DEG C, soaking time >=70 minute; The mass percentage of the chemical composition of the X level drill pipe body weldless steel tube material obtained is: C 0.24 ~ 0.29, Si 0.20 ~ 0.35, Mn 0.70 ~ 1.00, P≤0.015, S≤0.010, Cr 1.00 ~ 1.20, Mo 0.15 ~ 0.30 and Al≤0.040; All the other are Fe and inevitable trace elements, and mass percent adds up to 100%.
Further, described steelmaking process comprises: hot metal pretreatment, top and bottom combined blown converter smelting, LF external refining, VD vacuum outgas and round billet continuous casting.
Further: described top and bottom combined blown converter smelting comprises top blast oxygen and argon bottom-blowing, terminal point control target is mass percentage≤0.010% of mass percentage >=0.06% of C, P, and final deoxygenation adopts aluminium deoxidation; The omnidistance argon bottom-blowing of described LF external refining; Vacuum tightness≤the 0.06KPa of described VD vacuum outgas, dark vacuum time >=13 minute, omnidistance argon bottom-blowing stirs, and feeds silicon-calcium wire 1 ~ 2 meter of/ton of steel after described VD vacuum outgas, after feeding silk, soft blow time >=15 minutes; Described round billet continuous casting adopts M-EMS, superheating temperature≤30 DEG C.
Further, the mass percentage of the described chemical composition containing X level drill pipe body weldless steel tube material is: C 0.27, Si 0.24, Mn 0.83, P 0.013, S 0.008, Cr 1.07, Mo 0.23 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or, C0.25, Si 0.22, Mn 0.85, P 0.014, S 0.005, Cr 1.04, Mo 0.20 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or, C 0.24, Si 0.24, Mn 0.80, P 0.012, S 0.007, Cr 1.05, Mo 0.22 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or, C 0.29, Si 0.20, Mn 1.00, P 0.010, S 0.003, Cr 1.00, Mo 0.15 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or C 0.26, Si 0.35, Mn 0.70, P 0.015, S 0.010, Cr 1.20, Mo 0.30 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%.
Technique effect of the present invention is as follows:
1, X level drill pipe body weldless steel tube material of the present invention meets the performance requriements to X level drill pipe body in American Petroleum Institute (API) drilling rod specification API Spec 5DP.
2, the preparation method of X level drill pipe body weldless steel tube of the present invention reduces cost of development, there is provided a kind of X level drill pipe body weldless steel tube in the superior mode of economy, provide that a kind of material is excellent, the rational drill pipe body weldless steel tube of superior performance, production technology process for exploitation of oil-gas field obtains maximization of economic benefit.
Embodiment
In chemical composition of the present invention, the design considerations of principal element content range is:
C is the main strengthening element of steel, may be dissolved in steel to form interstitial solid solution and play solution strengthening effect, forms Carbide Precipitation, play precipitation strength effect with strong carbide element.When C content within the specific limits time, the intensity of steel, hardness, hardening capacity and wear resistance can be improved, but C content is too high, the plasticity of steel, toughness can be reduced.Consider intensity and the ballistic work requirement of drill pipe body, in the present invention, the content of C is 0.24% ~ 0.29%.
Mn can improve steel belt roof bolt stability higher intensity and hardness, improve the hardening capacity of steel, the MnS of higher melt can be formed with the S in steel, FeS is avoided to separate out on nascent crystal boundary when crystallization, form the continuous or discontinuous reticulattion of surrounding ferrite crystal grain, eliminate the red brittleness of steel, improve the hot workability of steel.When Mn content is higher, there is the tendency making crystalline grain of steel alligatoring, and increase superheated susceptivity and the temper brittleness of steel.Therefore, in the present invention, the content of Mn is 0.70% ~ 1.00%.
Cr have improve steel intensity, hardness, high-temperature mechanical property, hardening capacity, make steel have the effects such as good erosion resistance and oxidation-resistance, but because Cr is the element promoting temper brittleness, the brittle transition temperature of steel can be significantly improved, promote steel belt roof bolt fragility, adverse influence is produced to the performance of steel.Therefore, in the present invention, the content of Cr is 1.00% ~ 1.20%.
Mo has the effect of solution strengthening to ferrite, hardening capacity and the heat resistance of steel can be improved, improve the corrosion stability of steel in some medium, prevent spot corrosion to be inclined to, and when other causes the element of temper brittleness and deposits, Mo can reduce or suppress the temper brittleness that these elements cause.But because the price of Mo is higher, and there is the undesirable action making steel produce greying tendency.Therefore, in the present invention, the content of Mo is 0.15% ~ 0.30%.
In the present invention, P, S are the harmful elements in steel, and in steel, P content is high can cause steel " cold short ", and S content is high can cause steel " hot-short ", thus the plasticity of reduction steel, toughness and welding property, but P, S content reduced in steel can increase production cost.Therefore, P≤0.015% in steel, S≤0.010% is required.
Al is reductor conventional in steel, adds a small amount of aluminium in steel, can play crystal grain thinning, improves the impelling strength of steel, reduces the brittle transition temperature of steel, improve the effects such as the low-temperature impact toughness of steel.But when aluminium content is higher, will promote the greying tendency of steel to reduce hot strength and the toughness of steel.Therefore its content controls to be advisable≤0.040%.
The present invention adopts molten iron and steel scrap to do raw material, and concrete production process is as follows:
Steelmaking process is: hot metal pretreatment → top and bottom combined blown converter smelting → LF external refining → VD vacuum outgas → round billet continuous casting, obtains circular pipe blank.Molten iron after high-quality steel scrap low for impurity content and desulfurization process is blended in converter, adopts the Techniques of Combined Blowing of top blast oxygen and argon bottom-blowing to carry out converter smelting.Converter terminal control objectives is: mass percentage >=0.06% of C; Mass percentage≤0.010% of P.Carry out deoxidation alloying operation during tapping, final deoxygenation adopts aluminium deoxidation technique, carries out pushing off the slag in tapping process.Then according to chemical composition and the temperature of molten steel after converter tapping, in LF (LadleFurnace) i.e. ladle furnace, carry out slag making desulfurization, composition adjustment and warming temperature, argon bottom-blowing stirs through whole refining process.Subsequently ladle is moved to VD (Vacuum Degassing) i.e. vacuum argon blowing degassing method process station, at vacuum tightness≤0.06KPa, dark vacuum time >=13 minute, under the condition that the omnidistance argon bottom-blowing of VD vacuum outgas stirs, reach degassed, go to be mingled with, the object of non-uniform components and temperature.Feed silicon-calcium wire 1 ~ 2 meter of/ton of steel after vacuum outgas, feed after silk, soft blow time >=15 minutes.Should be noted that weak mixing effect, can not exposed molten steel.The molten steel that chemical composition and temperature meet the demands is winched to round billet continuous casting machine cast, obtain the continuous casting circular tube blank of required specification.M-EMS is adopted in casting process; Whole process protection is cast; namely on tundish and crystallizer liquid steel level, adopt solid protective slag protection, ladle adopts long nozzle protection to tundish, tundish adopts submerged nozzle protection to crystallizer; control superheating temperature≤30 DEG C, to ensure that strand has good inside and outside quality.
After testing, the chemical composition of each embodiment is as shown in table 1.
The each embodiment composition of table 1 (mass percent/%)
| Embodiment | C | Si | Mn | P | S | Cr | Mo |
| Embodiment 1 | 0.27 | 0.24 | 0.83 | 0.013 | 0.008 | 1.07 | 0.23 |
| Embodiment 2 | 0.25 | 0.22 | 0.85 | 0.014 | 0.005 | 1.04 | 0.20 |
| Embodiment 3 | 0.24 | 0.24 | 0.80 | 0.012 | 0.007 | 1.05 | 0.22 |
| Embodiment 4 | 0.29 | 0.20 | 1.00 | 0.010 | 0.003 | 1.00 | 0.15 |
| Embodiment 5 | 0.26 | 0.35 | 0.70 | 0.015 | 0.010 | 1.20 | 0.30 |
Note: each example Al≤0.040% in table; All the other are Fe and inevitable trace elements, and mass percent adds up to 100%.
The operation of rolling of steel comprises: a circle base heating → perforation → tube rolling → tube reducing or sizing → cold bed cooling → sawing → aligning → flaw detection → hand inspection → survey are grown, weigh, sprayed mark → warehouse-in, and circle base is rolled into weldless steel tube.After sawing being become the continuous casting circular tube blank establishment lot number of desired length, load in rotary heating furnace by root and heat, make the thorough evenly and not burning of heating of pipe blank, when heating of pipe blank to 1250 DEG C ~ 1300 DEG C, through tapping machine perforation, solid pipe billet is pierced into hollow hollow forging.Send in tube rolling mill and be rolled, rolling temperature is 1050 DEG C ~ 1100 DEG C.Strictly will control the use of milling train water coolant during rolling, forbid to water clarinet body, be then rolled into through stretch-reducing mill (or sizing mill) weldless steel tube that external diameter and wall thickness meet the demands, finishing temperature is greater than 800 DEG C.Hot-rolled tube is delivered to cold bed, and adopt solid matter cloth, after slowly cooling to room temperature, sawing becomes specified length.After straightener aligning, carry out non-destructive test(ing)(NDT) detection and hand inspection, then after surveying length, weigh and spraying mark, by production tube packaging and warehousing.
Roll state steel heat treatment process to comprise: Quench and temper.According to the chemical composition of steel, the requirement of microstructure and mechanical property, the temperature of quenching is 880 DEG C ~ 920 DEG C, and soaking time >=40 minute, quenchant is water.The temperature of tempering is 680 DEG C ~ 720 DEG C, soaking time >=70 minute.The after heat treatment metallographic structure of steel is tempered sorbite.
Rolling and thermal treatment process are not too obvious on the impact of this material chemical composition, and the mass percentage of the chemical composition of the X level drill pipe body weldless steel tube material therefore prepared through said process is: C 0.24 ~ 0.29, Si 0.20 ~ 0.35, Mn 0.70 ~ 1.00, P≤0.015, S≤0.010, Cr 1.00 ~ 1.20, Mo 0.15 ~ 0.30 and Al≤0.040; All the other are Fe and inevitable trace elements, and mass percent adds up to 100%.
The mechanical experimental results of each embodiment and the non-metallic inclusion rank of steel pipe are respectively as shown in table 2 and table 3.
The mechanical experimental results of each embodiment of table 2
The non-metallic inclusion rank of each embodiment steel pipe of table 3
| Embodiment | Category-A (being carefully) | Category-B (being carefully) | C class (being carefully) | D class (being carefully) | DS class |
| Embodiment 1 | 1 | 0.5 | 0.5 | 0.5 | / |
| Embodiment 2 | 1 | 0.5 | 0.5 | 0.5 | / |
| Embodiment 3 | 1 | 0.5 | 0.5 | 0.5 | / |
| Embodiment 4 | 1 | 0.5 | 0.5 | 0.5 | / |
| Embodiment 5 | 1 | 0.5 | 0.5 | 0.5 | / |
As can be seen from table 2 and table 3, yield strength >=682MPa; Tensile strength >=775MPa; Elongation >=21%; Be under the condition of 10mm × 5mm × 55mm in specimen size, summer when summer when summer when test temperature is 21 DEG C ± 3 DEG C is-10 DEG C ± 3 DEG C than v-notch longitudinal average absorption ballistic work >=60J, test temperature is-20 DEG C ± 3 DEG C than v-notch longitudinal average absorption ballistic work >=61J, test temperature average absorption ballistic work >=60J more longitudinal than v-notch, meets the performance requriements to X level drill pipe body in American Petroleum Institute (API) drilling rod specification API Spec5DP.
Claims (4)
1. a preparation method for X level drill pipe body weldless steel tube, is characterized in that, comprising: the operation of rolling of steelmaking process, steel and roll state steel heat treatment process; The operation of rolling of described steel comprises: circle base heating, perforation, tube rolling, a tube reducing or sizing, cold bed cooling, sawing, aligning, flaw detection, hand inspection, survey are grown, weigh, sprayed and mark and put in storage; The temperature of described round base heating is 1250 DEG C ~ 1300 DEG C, and the rolling temperature of described tube rolling is 1050 DEG C ~ 1100 DEG C; Described state steel heat treatment process of rolling comprises: Quench and temper; The temperature of described quenching is 880 DEG C ~ 920 DEG C, soaking time >=40 minute, and quenchant is water, and the temperature of described tempering is 680 DEG C ~ 720 DEG C, soaking time >=70 minute; The mass percentage of the chemical composition of the X level drill pipe body weldless steel tube material obtained is: C 0.24 ~ 0.29, Si0.20 ~ 0.35, Mn 0.70 ~ 1.00, P≤0.015, S≤0.010, Cr 1.00 ~ 1.20, Mo 0.15 ~ 0.30 and Al≤0.040; All the other are Fe and inevitable trace elements, and mass percent adds up to 100%.
2. the preparation method of X level drill pipe body weldless steel tube as claimed in claim 1, it is characterized in that, described steelmaking process comprises: hot metal pretreatment, top and bottom combined blown converter smelting, LF external refining, VD vacuum outgas and round billet continuous casting.
3. the preparation method of X level drill pipe body weldless steel tube as claimed in claim 2, it is characterized in that, described top and bottom combined blown converter smelting comprises top blast oxygen and argon bottom-blowing, terminal point control target is mass percentage >=0.06% of C, mass percentage≤0.010% of P, final deoxygenation adopts aluminium deoxidation; The omnidistance argon bottom-blowing of described LF external refining; Vacuum tightness≤the 0.06KPa of described VD vacuum outgas, dark vacuum time >=13 minute, omnidistance argon bottom-blowing stirs, and feeds silicon-calcium wire 1 ~ 2 meter of/ton of steel after described VD vacuum outgas, after feeding silk, soft blow time >=15 minutes; Described round billet continuous casting adopts M-EMS, superheating temperature≤30 DEG C.
4. the preparation method of the X level drill pipe body weldless steel tube as described in as arbitrary in claims 1 to 3, it is characterized in that, the mass percentage of the described chemical composition containing X level drill pipe body weldless steel tube material is: C 0.27, Si 0.24, Mn 0.83, P 0.013, S 0.008, Cr 1.07, Mo 0.23 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or, C0.25, Si 0.22, Mn 0.85, P 0.014, S 0.005, Cr 1.04, Mo 0.20 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or, C 0.24, Si 0.24, Mn 0.80, P 0.012, S 0.007, Cr 1.05, Mo 0.22 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or, C 0.29, Si 0.20, Mn 1.00, P 0.010, S 0.003, Cr 1.00, Mo 0.15 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%; Or C 0.26, Si 0.35, Mn 0.70, P 0.015, S 0.010, Cr 1.20, Mo 0.30 and Al≤0.040, all the other are Fe and inevitable trace elements, and massfraction amounts to 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310146591.9A CN103194680B (en) | 2013-04-25 | 2013-04-25 | The preparation method of X level drill pipe body weldless steel tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310146591.9A CN103194680B (en) | 2013-04-25 | 2013-04-25 | The preparation method of X level drill pipe body weldless steel tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103194680A CN103194680A (en) | 2013-07-10 |
| CN103194680B true CN103194680B (en) | 2015-09-16 |
Family
ID=48717493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310146591.9A Withdrawn - After Issue CN103194680B (en) | 2013-04-25 | 2013-04-25 | The preparation method of X level drill pipe body weldless steel tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103194680B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627962B (en) * | 2013-12-03 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Thick oil thermal extraction weldless steel tube and preparation method thereof |
| CN106756591A (en) * | 2016-11-02 | 2017-05-31 | 内蒙古包钢钢联股份有限公司 | 95ksi~110ksi steel grade sulfur resistant drill pipe body seamless steel pipes and preparation method thereof |
| 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 |
| CN110484818B (en) * | 2019-09-03 | 2020-08-14 | 山东钢铁股份有限公司 | Steel for rubber core support of oil blowout preventer and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1690241A (en) * | 2004-04-28 | 2005-11-02 | 宝山钢铁股份有限公司 | High-strength drilling rod for petroleum and method for making same |
| CN102691002A (en) * | 2012-06-01 | 2012-09-26 | 内蒙古包钢钢联股份有限公司 | Nuclear electric weldable seamless carbon steel pipe and production method thereof |
-
2013
- 2013-04-25 CN CN201310146591.9A patent/CN103194680B/en not_active Withdrawn - After Issue
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1690241A (en) * | 2004-04-28 | 2005-11-02 | 宝山钢铁股份有限公司 | High-strength drilling rod for petroleum and method for making same |
| CN102691002A (en) * | 2012-06-01 | 2012-09-26 | 内蒙古包钢钢联股份有限公司 | Nuclear electric weldable seamless carbon steel pipe and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103194680A (en) | 2013-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101629476B (en) | High strength and high toughness petroleum casing pipe capable of bearing low temperature within -40 to -80 DEG C | |
| CN101417296B (en) | Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm | |
| CN100537816C (en) | The petroleum steel pipe of anti-H 2 S stress corrosion and manufacture method thereof | |
| CN101613829B (en) | Steel pipe for borehole operation of 150ksi steel grade high toughness oil and gas well and production method thereof | |
| CN102747300B (en) | Seamless steel pipe for high-strength and high-toughness structure and manufacturing method thereof | |
| CN101892443A (en) | High strength and high toughness petroleum casing pipe at steel grade with yield strength of 170-180ksi and manufacturing method thereof | |
| CN101413088B (en) | Sulfurated hydrogen stress etching-resisting petroleum casing pipe and manufacturing method thereof | |
| CN101586450A (en) | Have high strength and high toughness petroleum casing pipe and manufacture method thereof | |
| CN102618791B (en) | High strength and ductility oil casing with hydrogen sulfide corrosion resistance and manufacturing method for oil casing | |
| CN100500917C (en) | Sulfur erosion resisting steel smelting method | |
| CN101928889A (en) | Steel for resisting sulfide corrosion and manufacturing method thereof | |
| CN106480375B (en) | A kind of high-strength electric resistance welded casing and its manufacturing method | |
| CN106811700B (en) | A kind of think gauge acid-resisting X60MS hot-rolled coils and its manufacture method | |
| CN105039863A (en) | Manufacturing method of martensite stainless steel seamless tube for oil well | |
| CN102162067B (en) | Steel for anticorrosion sucker rods in oil field and production method thereof | |
| CN105925883A (en) | High-strength and high-toughness N80Q petroleum casing pipe and manufacturing method thereof | |
| CN109913757A (en) | A kind of corrosion-resistant high anti-extrusion petroleum casing pipe and preparation method thereof | |
| CN104532168A (en) | High-quality non-quenched and tempered seamless steel tube for drilling and manufacturing method thereof | |
| CN103194680B (en) | The preparation method of X level drill pipe body weldless steel tube | |
| CN101608282A (en) | Anti--40 ℃～-60 ℃ low temperature drill rod material steel pipes and manufacture method thereof | |
| CN102268614A (en) | 165 ksi steel-level drill pipe capable of resisting minus 20 DEG C low temperature and manufacturing method thereof | |
| CN103352169B (en) | The heat treating method of perforation casing body weldless steel tube | |
| CN103484782A (en) | Method for manufacturing large-aperture high-strength gathering and transportation seamless steel tube for environment with high content of hydrogen sulfide | |
| CN104630655A (en) | Extra-thick steel plate having excellent balance between strength and toughness and used for welded structure and production process thereof | |
| CN106191671A (en) | High strength sulfur resisting hydrogen-type corrosion seamless line pipe and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150916 Effective date of abandoning: 20220623 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20150916 Effective date of abandoning: 20220623 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |