CN101660098B - Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof - Google Patents
Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof Download PDFInfo
- Publication number
- CN101660098B CN101660098B CN2009100704460A CN200910070446A CN101660098B CN 101660098 B CN101660098 B CN 101660098B CN 2009100704460 A CN2009100704460 A CN 2009100704460A CN 200910070446 A CN200910070446 A CN 200910070446A CN 101660098 B CN101660098 B CN 101660098B
- Authority
- CN
- China
- Prior art keywords
- temperature
- steel
- pipe
- steel pipe
- production method
- 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.)
- Active
Links
Classifications
-
- 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
Landscapes
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and a production method thereof. The steel pipe comprises the components by weight percentage of 0.08-0.12% of C, 0.20-0.50% of Si, 0.30-0.60% of Mn, 0-0.020% of P, 0-0.010% of S, 0-0.40% of Ni, 8.00-9.50% of Cr, 0.85-1.05% of Mo, 0-0.20% of Cu, 0-0.015% of Al, 0.18-0.25% of V, 0.06-0.10% of Nb, 0.030-0.070% of N and the balance of Fe. Simultaneously, the invention also provides the production method for producing the hot-rolling seamless steel pipe. The steel pipe and the production method have the effects that the performance of the steel pipe completely meets the requirement of ASME SA-335M standard on the tension and hardness and meets the requirement of GB5310 on impacting and duration strength, the steel pipe has excellent high-temperature performance, is applicable to the high-temperature bearing parts such as a steam pipeline, a connecting box and the like, which are used for high-temperature and high-pressure corrosive environment; and the duration strength under the temperature of 590 DEG C is 112MPa and the duration strength under the temperature of 620 DEG C is 81.4MPa.
Description
Technical field
The present invention relates to be used for heat-resisting, corrosion-resistant, the high pressure resistant P91 steel pipe and the production method of the employed steam-pipe of equipment such as boiler, chemical industry, the energy, collection case etc., especially under 580～620 ℃ of high temperature, 24～30MPa highly compressed hot rolled seamless steel tube and production method.
Background technology
Because scientific and technological develop rapidly has brought negative impacts such as environmental pollution, people recognize these serious problems gradually, and beginning drops into huge energy and financial resources aspect environmental improvement.
Electric power also is the blood of industrial development as the requisite energy of people's daily life simultaneously, and therefore, demand is quite big.Energy production world mainly relies on coal at present, and the burning of coal meeting produces a large amount of CO
2And SO
2Deng obnoxious flavour, severe contamination environment.Therefore people are making great efforts to improve the efficiency of fire coal of generating set, thereby reach the purpose that reduces noxious gas emission.And, just requiring boiler to improve vapor temperature and vapor pressure in order to improve efficiency of fire coal, common boi1er tube then can not adapt to the raising of vapor temperature and pressure, needs the steel pipe of more high temperature resistant and pressure.
The P91 high pressure boiler tube is the trade mark of stipulating in the ASME SA-335M standard, owing to contain 9%Cr, 1%Mo, also contain alloy strengthening elements such as V, Nb simultaneously, therefore having high temperature resistant, high pressure resistant and corrosion resistant fine quality, can be that 580～620 ℃, pressure are long term operation under the environment of 24～30MPa in temperature.
Required high temperature resistant, the highly compressed P91 of present domestic boiler manufacturing concern is mainly by the external supply of material, but external producer adopts modes such as pilger mill more, not only production efficiency is low, and rolling ratio can not guarantee greater than 3, quality product is had considerable influence, and Lead Time is long simultaneously, and costs an arm and a leg, seriously restrict the development of China's power industry, thereby influenced the rate of economic development of China; The domestic method of forging bore hole that then adopts is produced steel pipe, though can guarantee the pipe heart defect removes, but this method lumber recovery is quite low, therefore only be suitable for producing thick walled steel tube, owing to there is not rolling deformation, can not eliminate the body subsurface defect simultaneously, tube quality can not get guaranteeing, creep rupture strength does not often reach standard-required, has seriously restricted its development.
Summary of the invention
At structural deficiency in the prior art, the purpose of this invention is to provide a kind ofly be used under 580～620 ℃ of high temperature, 24～30MPa highly compressed hot rolled seamless steel tube and production method, be beneficial to guarantee that production tube satisfies the relevant criterion requirement, reach higher creep rupture strength simultaneously.
For achieving the above object, the technical solution used in the present invention provide a kind ofly be used under 580～620 ℃ of high temperature, 24～30MPa highly compressed hot rolled seamless steel tube, wherein: the composition of this steel pipe % by weight is C 0.08～0.12%, Si 0.20～0.50%, Mn 0.30～0.60%, P 0～0.020%, S 0～0.010%, Ni 0～0.40%, Cr 8.00～9.50%, Mo 0.85～1.05%, Cu 0～0.20%, Al 0～0.015%, V 0.18～0.25%, Nb 0.06～0.10%, N 0.030～0.070%, surplus is Fe.
A kind of production method of producing above-mentioned hot rolled seamless steel tube also is provided simultaneously.
Effect of the present invention is the strictness control by above hot rolled seamless steel tube and production technique, the performance of final finished pipe satisfies the requirement of ASME SA-335M standard to stretching, hardness fully, also satisfy the requirement of GB5310 impact and creep rupture strength, reached the first place in the world, concrete creep rupture strength contrast sees the following form:
Embodiment
In conjunction with the embodiments to of the present inventionly be used under 580～620 ℃ of high temperature, 24～30MPa highly compressed hot rolled seamless steel tube and production method be illustrated.
Be used under 580～620 ℃ of high temperature, 24～30MPa highly compressed hot rolled seamless steel tube, it is characterized in that: the composition of this steel pipe % by weight is C 0.08～0.12%, Si 0.20～0.50%, Mn0.30～0.60%, P 0～0.020%, S 0～0.010%, Ni 0～0.40%, Cr 8.00～9.50%, Mo 0.85～1.05%, Cu 0～0.20%, Al 0～0.015%, V 0.18～0.25%, Nb 0.06～0.10%, N 0.030～0.070%, surplus is Fe.
Production is used under 580～620 ℃ of high temperature, the production method of 24～30MPa highly compressed hot rolled seamless steel tube includes following steps:
1. adopt high-quality steel scrap or returns and sponge iron or molten iron to do steelmaking feed, melt, and carry out the composition coarse adjustment through electric arc furnace smelting by said ratio; Molten steel is carried out external refining; Carry out deoxidation by feeding silico-calcium barium reductor and replace the Al silk to carry out deoxidation, to have reduced the generation of endogenous inclusion; Afterwards molten steel is carried out the VD vacuum-treat, the V D time can not be less than 10min, to guarantee that inclusion fully floats, feeds CrN afterwards and blows N
2The method that combines is added the N element to molten steel, makes N content between 400～600ppm, and last blowing argon gas stirs;
2. the molten steel behind the VD is cast, before the casting ingot mould is carried out blowing argon, simultaneously ingot mould is heated, and strict control pouring temperature guarantees die casting base quality between 1550～1600 ℃; Molding when the ingot mould temperature drops to 400～600 ℃, the mould base of moulding carried out 1150～1230 ℃ heat, forge into pipe then, the strict control beginning forges between 1200～1300 ℃, final forging temperature is between 800～900 ℃, pipe is annealed after forging immediately, and 1160～1210 ℃ of annealing temperatures prevent the pipe cracking;
3. the pipe after forging is cut scale, go into ring-like stove afterwards, after being heated to 1100～1200 ℃, to pipe bore a hole, tandem rolling, sizing distortion operation, steel grade Cr, Mo alloy content height according to described weldless steel tube, beginning is rolled temperature be controlled to be 1200～1300 ℃, 800～900 ℃ of finishing temperatures; Described weldless steel tube after the hot rolling is carried out the thermal treatment of normalized and tempered, and normalizing temperature is 1040～1080 ℃, and tempering temperature is 770～790 ℃, according to the wall thickness difference of described weldless steel tube, adjusts soaking time; Described weldless steel tube after the thermal treatment is detected a flaw, and reconditioning is a production tube.
Of the present inventionly be used under 580～620 ℃ of high temperature, 24～30MPa highly compressed hot rolled seamless steel tube and production method control is based on following analysis:
1. chemical ingredients proportioning
Cross low C content and make hot strength reduce, but the C too high levels, then weldability reduces, and reduces high-temp plastic simultaneously.Adopt electrosmelting, electrode carburetting and ladle carburetting are serious, and VOD can effectively reductions C content, but can cause the increase of O content again, so C content is difficult to control.By the C content of control steel scrap and the proportioning that increases molten iron, begin carbon drop from electrosmelting, thereby controlled carbon content effectively, the C content that finally makes production tube is about 0.10%.
The adding of V, Nb has formed tiny carbide, has played the effect of precipitation strength, but too much V can cause the reduction of creep rupture strength.Therefore my company is controlled at V about 0.20%, and Nb is 0.07%.
S and Sization thing weaken crystal boundary at grain boundary segregation, form hole, thereby cause embrittlement of grain boundaries and creep embrittlement, therefore want strict control, and the P91 that my company produces is controlled at S content below 0.004%, can reach 0.001% individually.
The existence of P in steel can increase the fragility of steel, causes the alloying element macrosegregation simultaneously, therefore wants the content of strict control P, and P content is controlled at below 0.015%.
And too high Al content will weaken other element role, also reduces the enduring quality of steel simultaneously strongly, therefore Al content is controlled at below 0.010%.
N becomes compound between the MX shaped metal with Nb in the steel with V-arrangement, intensity is had a significant effect, and therefore N content temporarily is controlled at about 400ppm.
The adding of Cr can significantly improve the antioxidant property of steel, simultaneously in steel with Cr
3(C, N) or Cr
23C
6Form exist, the intensity that has improved steel greatly is creep rupture strength especially.But the Cr of too high amount not only increases cost, and the δ phase that sharply descends of the enduring quality that steel is easy to generate can cause steel, and therefore the content with Cr is controlled at about 8.2%.
Si is as strong reductor, and the content in the steel can not be very little, and Si improves the hot strength of steel simultaneously, but when Si content is high, causes the greying of carbon in the steel easily, therefore the Si in the steel is controlled at about 0.30%.
Mn has the effect of deoxidation, improves the purity of steel, and improves the plasticity of steel, but during too high levels, then increases the content of steel grade inclusion, and therefore the content with Mn is controlled between 0.40 ~ 0.50%.The control beginning forges and final forging temperature, anneals immediately after the forging, prevents the pipe cracking.
2. tube-rolling technique: steel pipe adopts three different units such as retained mandrel continuous rolling-tube unit MPM, three-roller type high precision tube rolling unit PQF and three rod oblique milling unit ASSEL to be rolled.After pipe is cut scale, after entering ring-like stove and being heated to 1100～1200 ℃, to pipe bore a hole, distortion operations such as tandem rolling, sizing, contain the high characteristics of alloy such as Cr, Mo according to this steel grade,, the beginning is rolled temperature be controlled to be 1200～1300 ℃ by experimental study, 800～900 ℃ of finishing temperatures, by three road deformation processes, guaranteed that steel pipe rolling compares greater than 3, has eliminated the defective of steel duct simultaneously.Final outside diameter tolerance is controlled at 0%～+ 1.2%, and wall thickness deviation is controlled within 0%～+ 15% the scope.
3. thermal treatment and steel pipe complete processing: the P91 after the hot rolling is carried out the thermal treatment process of normalized and tempered, and normalizing temperature is 1040～1080 ℃, and tempering temperature is 770～790 ℃, according to wall thickness size proper extension soaking time.Steel pipe after the thermal treatment is detected a flaw, and surfaces externally and internally is carried out reconditioning, and the outer diameter of steel pipes deviation after the reconditioning is ± 0.75%, and wall thickness deviation is within-10%～+ 12.5% scope.
The specific performance of P91 is as follows after the thermal treatment:
Embodiment 1:
Be used under 580～620 ℃ of high temperature, the chemical ingredients of 24～30MPa highly compressed hot rolled seamless steel tube is (wt%) C:0.10%, Si:0.33%, Mn:0.45%, P:0.009%, S:0.003%, Ni:0.08%, Cr:8.28%, Mo:0.91%, Cu:0.08%, Al:0.011%, V:0.20, Nb:0.08%, Ti: N:0.0471%＜0.010%,, surplus is Fe.
Embodiment 2:
Electric furnace proportion scale: molten iron: 45t; Tube head: 45t; Bottom ash: 2 tons.Electric furnace steel tapping requires C≤0.06%, P≤0.005%, adds 2 bags before the tapping and takes off the S agent, carries out deoxidation with 0.5 ton of silico-calcium barium reductor, adds 1 ton of molybdenum-iron, 0.1 ton of lime.Guarantee 1680～1690 ℃ of tapping temperatures.
Ladle refining: add carbon Cr iron in a subtle way, it is qualified to adjust alloying elements such as Mo, V, Nb, Si after the target value in batches.
The VD:VD high vacuum time must guarantee 〉=10 minutes, feed Ca-Si silk and CrN cored-wire afterwards, and change then and blow N
2About 20min.
Die casting: the molten steel behind the VD is cast, before the casting ingot mould is carried out blowing argon, simultaneously ingot mould is heated, and strict control pouring temperature, guarantee die casting base quality.Molding when the mould temperature drops to 500 ℃ is carried out 1200 ℃ heat to the mould base of moulding, forges then, and the strict control beginning forges and final forging temperature, anneals immediately after the forging, prevents the pipe cracking.
Embodiment 3:
Steel pipe adopts three-roller type high precision tube rolling unit PQF to be rolled.After pipe is cut scale, after entering ring-like stove and being heated to 1150 ℃, the plasticity variation that all can make pipe too high or too low for temperature, cause the steel tube surface quality defective easily, afterwards to pipe bore a hole, distortion operations such as tandem rolling, sizing, contain the high characteristics of alloy such as Cr, Mo according to this steel grade, by experimental study, beginning is rolled temperature be controlled to be less than 1300 ℃, finishing temperature is greater than 800 ℃.Final outside diameter tolerance is controlled at+and about 0.91%, wall thickness deviation is controlled at+and about 10%.
Embodiment 4:
Under the roller bottom type special atmosphere oven to after the hot rolling be used under 580～620 ℃ of high temperature, 24～30MPa highly compressed weldless steel tube carries out the thermal treatment of normalized and tempered, normalizing temperature is 1050 ℃, tempering temperature is 780 ℃.Steel pipe after the thermal treatment is detected a flaw, and surfaces externally and internally is carried out reconditioning, and the outer diameter of steel pipes deviation after the reconditioning is 0%, and wall thickness deviation is+2.5%.
Embodiment 5:
The creep rupture strength of production tube under 590 ℃ is 112MPa, and the creep rupture strength under 620 ℃ is 81.4MPa, all is not less than the requirement (590 ℃ standard-required 112MPas, 620 ℃ standard-requireds be 74MPa) of GB5310 to 10Cr9MolVNbN.
Claims (2)
- One kind be used under 580～620 ℃ of high temperature, 24～30MPa highly compressed hot rolled seamless steel tube, it is characterized in that: the composition of this steel pipe % by weight is C:0.10%, Si:0.33%, Mn:0.45%, P:0.009%, S:0.003%, Ni:0.08%, Cr:8.28%, Mo:0.91%, Cu:0.08%, Al:0.011%, V:0.20%, Nb:0.08%, Ti: N:0.0471%＜0.010%,, surplus is Fe.
- 2. production method of producing the described highly compressed hot rolled seamless steel tube of claim 1, this method includes following steps:1. adopt high-quality steel scrap or returns and sponge iron or molten iron to do steelmaking feed, melt, and carry out the composition coarse adjustment through electric arc furnace smelting by said ratio; Molten steel is carried out external refining; Carry out deoxidation by feeding silico-calcium barium reductor and replace the Al silk to carry out deoxidation, to reduce the generation of molten steel endogenous inclusion; Afterwards molten steel is carried out the VD vacuum-treat, the VD time can not be less than 10min, to guarantee that inclusion fully floats, feeds CrN afterwards and blows N 2The method that combines is added the N element to molten steel, makes N content between 400～600ppm, and last blowing argon gas stirs;2. the molten steel behind the VD is cast, before the casting ingot mould is carried out blowing argon, simultaneously ingot mould is heated, and strict control pouring temperature guarantees die casting base quality between 1550～1600 ℃; Molding when the ingot mould temperature drops to 400～600 ℃, the mould base of moulding carried out 1150～1230 ℃ heat, forge into pipe then, strict control initial forging temperature is between 1200～1300 ℃, final forging temperature is between 800～900 ℃, pipe is annealed after forging immediately, and annealing temperature prevents the pipe cracking at 1160～1210 ℃;3. the pipe after forging is cut scale, go into ring-like stove afterwards, after being heated to 1100～1200 ℃, to pipe bore a hole, tandem rolling, sizing distortion operation, steel grade Cr, Mo alloy content height according to described weldless steel tube, beginning is rolled temperature be controlled to be 1200～1300 ℃, 800～900 ℃ of finishing temperatures; Described weldless steel tube after the hot rolling is carried out the thermal treatment of normalized and tempered, and normalizing temperature is 1040～1080 ℃, and tempering temperature is 770～790 ℃, according to the wall thickness difference of described weldless steel tube, adjusts soaking time; Described weldless steel tube after the thermal treatment is detected a flaw, and reconditioning is a production tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100704460A CN101660098B (en) | 2009-09-16 | 2009-09-16 | Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100704460A CN101660098B (en) | 2009-09-16 | 2009-09-16 | Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101660098A CN101660098A (en) | 2010-03-03 |
| CN101660098B true CN101660098B (en) | 2011-07-27 |
Family
ID=41788352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100704460A Active CN101660098B (en) | 2009-09-16 | 2009-09-16 | Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101660098B (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345077B (en) * | 2011-09-21 | 2013-10-09 | 西南石油大学 | Large-expansion-ratio expansion pipe steel with high product of strength and elongation and preparation method thereof |
| CN102383053B (en) * | 2011-10-25 | 2013-07-03 | 华洪萍 | New heat treatment enhancing process of heat resistant steel |
| CN102534413B (en) * | 2011-12-31 | 2013-09-11 | 宁波市瑞通新材料科技有限公司 | Production method of corrosion-resistant steel pipe for high-pressure boiler |
| CN102690995A (en) * | 2012-06-01 | 2012-09-26 | 内蒙古包钢钢联股份有限公司 | High-temperature resistant seamless steel pipe and production method thereof |
| CN103952634B (en) * | 2014-04-02 | 2016-04-13 | 攀钢集团成都钢钒有限公司 | Anti-CO 2corrosion seamless steel pipe and manufacture method |
| CN104593697B (en) * | 2015-01-21 | 2016-08-24 | 山西太钢不锈钢股份有限公司 | A kind of manufacture method of power station high-strength temperature-resistant steel plate |
| CN104593696B (en) * | 2015-01-21 | 2016-09-21 | 山西太钢不锈钢股份有限公司 | A kind of station boiler heat-resisting steel sheet and plate and manufacture method thereof |
| CN104630437B (en) * | 2015-01-21 | 2016-09-21 | 山西太钢不锈钢股份有限公司 | A kind of station boiler manufacture method of the heat-resisting pipe of big specification |
| CN104561839B (en) * | 2015-02-09 | 2017-04-05 | 中国第一重型机械股份公司 | A kind of rare earth modified 9%Cr martensites heat resisting cast steel and its manufacture method |
| FR3047254B1 (en) | 2016-02-02 | 2018-02-16 | Vallourec Tubes France | STEEL COMPOSITION WITH IMPROVED ANTI-COKAGE PROPERTIES |
| CN105586532B (en) * | 2016-03-25 | 2017-07-07 | 攀钢集团成都钢钒有限公司 | Low-alloy high-strength heavy caliber thick wall seamless steel tube and its manufacture method |
| CN105964721B (en) * | 2016-05-09 | 2018-03-06 | 金堆城钼业股份有限公司 | A kind of preparation method of molybdenum and molybdenum alloy tubing |
| CN105861786B (en) * | 2016-06-02 | 2017-09-12 | 高原 | The method that iron filings make bearing material |
| CN106119488A (en) * | 2016-07-28 | 2016-11-16 | 柳州科尔特锻造机械有限公司 | A kind of P91 steel alloy heating in the forging |
| CN106367689B (en) * | 2016-09-29 | 2018-04-03 | 马钢(集团)控股有限公司 | A kind of effective steel of high-pressure boiler and preparation method thereof |
| CN107151760A (en) * | 2017-06-12 | 2017-09-12 | 合肥铭佑高温技术有限公司 | A kind of supporting steel pipe of high-temperature service and its production method |
| CN109207844A (en) * | 2017-06-30 | 2019-01-15 | 宝钢特钢有限公司 | A kind of overcritical heat-resisting steel sheet and plate and its manufacturing method |
| CN109622659A (en) * | 2018-12-17 | 2019-04-16 | 安徽宝泰特种材料有限公司 | A kind of manufacturing method of heavy caliber TC4 titanium alloy thick-wall seamless material |
| CN109881196B (en) * | 2019-04-11 | 2021-05-04 | 华能国际电力股份有限公司 | Main steam pipeline with inner wall anti-oxidation coating and preparation method thereof |
| JP2022083627A (en) * | 2020-11-25 | 2022-06-06 | 大同特殊鋼株式会社 | Steel for mold |
| CN115852257A (en) * | 2022-12-16 | 2023-03-28 | 扬州诚德钢管有限公司 | Heat-resistant steel seamless steel tube for nuclear power and manufacturing method thereof |
-
2009
- 2009-09-16 CN CN2009100704460A patent/CN101660098B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101660098A (en) | 2010-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101660098B (en) | Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof | |
| WO2022205939A1 (en) | Hydrogen-induced-cracking-resistant pressure vessel steel plate with thickness greater than 200-250 mm and manufacturing method therefor | |
| CN105937010B (en) | A kind of modified 09GrCuSb steel for resisting sulfuric acid dew point corrosion and its manufacturing method | |
| CN106734805B (en) | Φ 500~650mm Cr6 swaged forging Electro Slag Remelting Steel cold roll blank forging deformation techniques | |
| CN101413088B (en) | Sulfurated hydrogen stress etching-resisting petroleum casing pipe and manufacturing method thereof | |
| CN104762559B (en) | Method for producing steel plate for hydrogen-contacting equipment | |
| CN107974612B (en) | High-strength and high-toughness steel plate for SSCC (single strand ceramic) resistant spherical tank and manufacturing method thereof | |
| CN1686666A (en) | Production method of large high chromium steel cold roll blank | |
| CN102260827A (en) | Drill collar steel and preparation method thereof | |
| CN103205645A (en) | Superlarge thickness hydrogen chromium molybdenum steel plate for hydrogenation equipment and manufacture method thereof | |
| CN103361561B (en) | The preparation method of coupling material weldless steel tube | |
| CN103276310A (en) | Rare-earth-containing H-shaped steel with low-temperature toughness and production method thereof | |
| CN103725967A (en) | SCMV4-2 pressure vessel steel plate with specification of below 120mm and production method of steel plate | |
| CN113186455A (en) | Production method of high-strength steel plate for nuclear energy safety container | |
| CN112210719A (en) | Low-cost high-performance Q500 bridge steel and production method thereof | |
| CN114134420A (en) | Steel for blowout prevention pipe for oil and gas drilling and production method | |
| CN104004957B (en) | Oxides Metallurgy Technology is utilized to produce the method for small reduction ratio low temperature H profile steel | |
| CN109852881B (en) | Steel for 45CrNiMoVA drill tool and production method thereof | |
| CN103114248B (en) | Steel for drilling tools and method for smelting steel for drilling tools | |
| CN101724783A (en) | Heat resisting type alloy structure steel plate and method for producing same | |
| CN112962027A (en) | Optimized machining method of alloy structural steel | |
| CN110004364B (en) | Large loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and manufacturing method thereof | |
| CN115125457B (en) | Steel for-50 ℃ low-temperature-resistant petrochemical heat exchanger tube plate produced by continuous casting large round billets and manufacturing method thereof | |
| CN114855084B (en) | Hot-rolled round steel for 120ksi steel grade high-strength high-toughness high-grade sulfur-resistant drill rod joint and preparation method thereof | |
| CN102912231A (en) | Production method for ultrahigh strength steel plate |
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 | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190619 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
|
| TR01 | Transfer of patent right |