CN103290334A - Atmosphere corrosion resistance seamless steel tube containing rare earth and production method thereof - Google Patents
Atmosphere corrosion resistance seamless steel tube containing rare earth and production method thereof Download PDFInfo
- Publication number
- CN103290334A CN103290334A CN2013101683538A CN201310168353A CN103290334A CN 103290334 A CN103290334 A CN 103290334A CN 2013101683538 A CN2013101683538 A CN 2013101683538A CN 201310168353 A CN201310168353 A CN 201310168353A CN 103290334 A CN103290334 A CN 103290334A
- Authority
- CN
- China
- Prior art keywords
- corrosion resistance
- rare earth
- steel tube
- atmospheric corrosion
- 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.)
- Pending
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
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses an atmosphere corrosion resistance seamless steel tube containing rare earth and a production method thereof, and belongs to the technical field of metallurgy and molding. The atmosphere corrosion resistance seamless steel tube comprises the materials by weight percent (Wt%): 90% of blast furnace liquid iron and 10% of excellent steel scrap, and the chemical ingredients of a tube blank comprise the following chemical components by weight percent (Wt%): 0.05-0.10% of C, 0.10-0.30% of Si, 1.30-1.60% of Mn, not more than 0.020% of P, not more than 0.005 of S, 0.20-0.50% of Cr, 0.10-0.30% of Mo, 0.20-0.40% of Ni, 0.30-0.50% of Cu, 0.05-0.20% of V, 0.01-0.03% of Ti, 0.01-0.04% of Al, 0.0005-0.0100% of RE, and the balance of Fe and non-detectable microelements. The preparation method comprises the technological processes of: preprocessing of molten iron, top and bottom combined-blowing converter smelting, LF furnace refining, VD vacuum treatment, continuously casting of a round billet, cutting, heating of the tube blank, perforating, continuously rolling, reheating, coining (reducing tension), straightening, cooling, cutting via a saw, and flaw detection; the mechanical properties of the steel tube are as follows: the yield strength is 460-520 MPa; the tensile strength is 600-660 MPa; the yield ratio is smaller than or equal to 0.80; the elongation percentage is greater than or equal to 25%; the transverse impact value is greater than or equal to 100J/cm<2> (0 DEG C); the shear ratio is 100%; the grain size is greater than or equal to 8.5 grades; the hardness is smaller than or equal to 21.0 HRC (rockwell hardness); the residual stress is smaller than or equal to 30 MPa. The product disclosed by the invention has the characteristics of high hardness matching degree, small grain size and good air-corrosion resistance.
Description
One, affiliated technical field:
The invention belongs to ferrous metal smelting and stress metal manufacture field, relate to a kind of weldless steel tube and production method thereof that contains the non-modified atmospheric corrosion resistance of rare earth.
Two, background technology:
China's weather is complicated and changeable, and the annual steel of scrapping because of atomospheric corrosion are quite a lot of, for this reason, developed weather resisting steel both at home and abroad in succession, and the application of these materials has effectively prevented the destruction that atomospheric corrosion produces steel.Such steel are mainly sheet material and section bar, do not relate to weldless steel tube, and the spy develops the atmospheric corrosion resistance weldless steel tube for this reason, to satisfy weldless steel tubes such as transport pipe, oil derrick and engineering machinery to the requirement of atmospheric corrosion resistance.
By retrieval, Chinese invention patent " weather-resistant low alloy steel " (number of patent application: 02137308.6), it exists following problem and shortcoming:
1. the chemical ingredients scope is too wide, causes the mechanical property fluctuation too big, and operability is not strong;
2. adopt cooling controlling and rolling controlling process to be applicable to board materials production, but not strong to the reference of seamless steel tube production.
Three, summary of the invention:
The purpose of this invention is to provide that a kind of unrelieved stress is low, high, the good weldless steel tube that contains rare earth and the production method thereof of atmospheric corrosion resistance of toughness and tenacity coupling.
The object of the present invention is achieved like this:
With the blast-melted of weight percent 90% and 10% high-quality steel scrap as raw material.
Produce with following technical process: at first to the above-mentioned blast-melted pre-treatment of carrying out, together adding top and bottom combined blown converter with above-mentioned high-quality steel scrap then smelts, to smelt the good molten steel ladle of packing into again enters furnaceman LF position and carries out refining, enter the VD station after refining is finished and carry out the vacuum outgas processing, carry out round billet continuous casting again, and continuously cast bloom cut into pipe, then continuously cast billet for pipe-making is heated, to the pipe that heats bore a hole and tandem rolling make it become the tandem rolling pipe, tube rolling is carried out the reheat temperature raising, align through after the sizing, send into the cold bed cooling then, implement sawing afterwards, finally by carrying out flaw detection, eligible is atmospheric corrosion resistance pipe finished product.
Its brief description of the process is: hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → round billet continuous casting → cutting → heating of pipe blank → perforation → tandem rolling → reheat → sizing → aligning → cooling → sawing → flaw detection.
The production process of continuous casting circular tube blank is as described below:
1, with blast-melted through pre-treatment, make that the S amount (weight percent) that contains in the molten iron is reduced to below 0.010%.
2, pretreated molten iron is blended into top and bottom combined blown converter, add (weight percent) 10% high-quality steel scrap, adopt single slag technology to smelt, control finishing slag basicity and terminal point target, carry out deoxidation alloying in the tapping process, final deoxygenation adopts aluminium deoxidation technology, and tapping process must pushing off the slag or skimmed adding lime piece after the tapping process interalloy adds.
3, carry out concise at the LF stove: the refining whole process is normally blown Ar on request, adopts from rudimentary and counts to the mode that senior number improves heat-up rate gradually and heat temperature raising; Carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature; The white slag operation is made in employing.
4, the refining of LF stove finishes back maintenance bottom soft blow Ar, by predetermined add-on feeding rare-earth wires.
5, carry out VD vacuum-treat: vacuum tightness≤0.10KPa, dark vacuum time 〉=13 minutes.
6, feeding fixed length silico-calcium silk carries out blowing in 8-10 minute Ar behind hello the silk; To carry out round billet continuous casting through the molten steel after the VD vacuum-treat, adopt constant speed control and the induction stirring technology of low pulling rate; The control molten steel overheat; Strand is through after aligning, and flame cutting is circular pipe blank.
Pipe is carried out the chemical ingredients chemical examination, and the chemical ingredients of pipe should meet following requirement (weight percent %): C0.05-0.10; Si0.10-0.30; Mn1.30-1.60; P≤0.020; S≤0.005; Cr0.20-0.50; Mo0.10-0.30; Ni0.20-0.40; Cu0.30-0.50; V0.05-0.20; Ti0.01-0.03; Al0.01-0.04; Rare earth elements RE 0.0005-0.0100; Surplus is matrix Fe and the micro impurity element that can't detect.
Described rare earth elements RE is the norium of Ce, La, and their weight percent is respectively: Ce67%, La33%.
Add rare earth element and can play effects such as improving non-metallic inclusion form, reinforcement crystal boundary, thereby obtain the effect that improves corrosion resistance nature and impelling strength.
Composition is chemically examined the continuous casting circular tube blank that qualified and sufur printing is not more than 2.0 grades carry out tubulation, the tubulation process is as follows:
Pipe is put into process furnace heat, continuous review and the temperature of each sections such as process furnace preheating section, heating zone, soaking zone controlled well, each section temperature controlling scope sees Table 1;
The control of each section of table 1 rotary heating furnace temperature (℃)
Each section of process furnace temperature is controlled automatically and automatic record with microcomputer.
Hot tool must be measured before use, must check before rolling, handle roller-way, avoids scratching tube wall.
To be rolled into the weldless steel tube of the required specification of user after the pipe perforation that heat again at corresponding tube rolling unit, every batch is carried out once heat sampling at least when rolling, checks geometrical dimension; Steel pipe behind the tandem rolling enters reheating furnace, and the reheating furnace temperature is controlled between 900-930 ℃, and the control of body temperature is between 830-890 ℃, to reach the effect of rolling normalizing behind the sizing; It is straight to carry out the band temperature correction, straightening temperature 〉=500 ℃.
Then steel pipe is pursued the Zhi Jinhang carrying out flaw detection.
Through above-mentioned tube-making process process, can produce " weldless steel tube that contains the rare earth atmospheric corrosion resistance " of the present invention.
The beneficial effect of the invention:
1. add proper C u, improved the atmospheric corrosion resistance of material, the Ni of adding can improve the toughness that the red brittleness of Cu in steel improved material again;
2. owing to be with temperature correction straight more than 500 ℃, the unrelieved stress of steel pipe is lower, unrelieved stress :≤30MPa (adopting the ring cutting method);
3. because the unique component of rare earth element " contain design ", makes every excellent performance of steel pipe in conjunction with ripe production technique, the specific performance index is as follows:
Yield strength: 470～550MPa; Tensile strength: 630～720MPa; Yield tensile ratio :≤0.80; Unit elongation: 〉=25%; Traverse impact value: ak
V〉=100J/cm
2(0 ℃); Shear ratio: 100%; Hardness :≤21.0HRC.
4. atmospheric corrosion resistance
Because unique composition designs+controls finishing temperature technology, makes the average corrosion rate of material of the present invention only reach 49% of contrast material, shows that atmospheric corrosion resistance is good.
The present invention is directed to the problem that exists in the background technology, by technical measures such as " unique chemical compositions design and be the unique production technique of raw material with blast-melted ", solved the problems referred to above well, obtained obvious improvement.
Four, embodiment:
Be described in further detail below in conjunction with the present invention of embodiment.
Embodiment 1:
Raw material is by weight percentage: blast-melted 90%, and high-quality steel scrap 10%.
The technological process of production is in proper order: hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → round billet continuous casting → cutting → heating of pipe blank → perforation → tandem rolling → reheat → sizing → aligning → cooling → sawing → flaw detection.
The concrete technological process of production is summarized as follows:
90 tons of blast-melted usefulness " metal magnesium powder " are done the desulfating and deoxidation pre-treatment, make the S amount that contains in the molten iron be reduced to (weight percent) below 0.010%;
Described 90 tons of preprocessed molten irons are blended in 100 tonnes the top and bottom combined blown converter, add 10 tons of high-quality steel scraps again, adopt single slag technology to smelt then, finishing slag basicity is by 3.0 controls, adopt silicomanganese, ferromanganese and ferrochrome to carry out deoxidation alloying during tapping, final deoxygenation adopts aluminium deoxidation technology, the necessary pushing off the slag of tapping process, the pushing off the slag failure must be skimmed, and adds 200kg lime piece after the tapping process interalloy adds.
Enter furnaceman LF position and carry out refining smelting the good molten steel ladle of packing into: normal Argon on request during refining, adopt from rudimentary and count to the mode heat temperature raising that senior number improves heat-up rate gradually; Carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature; The white slag operation is made in employing, and copper coin, nickel plate, vanadium iron, molybdenum-iron and ferro-titanium added in the middle and later periods;
After finishing, the refining of LF stove to keep bottom soft blow Ar, by the rare-earth wires of predetermined add-on feeding certain-length.
Then the good molten steel of refining is carried out the VD vacuum-treat: dark vacuum tightness≤0.10KPa, dark vacuum time 〉=13 minutes; Feed the silicon-calcium wire of certain-length again, feed the silk back and keep 8～10 minutes soft blow Ar.
Will be through the molten steel after the VD vacuum-treat big bag hang on ladle turret and carry out 5 machines, 5 stream round billet continuous castings, adopt constant speed control and the induction stirring technology of low pulling rate during continuous casting; Molten steel overheat Δ T≤30 ℃; Strand is aligned after going out the secondary cooling zone territory, is circular pipe blank with flame cutting then.
To pipe samplingization, check, its chemical ingredients result of laboratory test (weight percent content) is as table 2:
The chemical ingredients of table 2 the present invention and contrast experiment's steel (weight %)
Sufur printing: all be no more than 1.0 grades, macroscopic examination is qualified.
The pipe of changing, being up to the standards is carried out tubulation, and the tubulation process is as follows:
In order to make pipe have good rolling performance, continuous detecting and control preheating section, heating zone, the soaking zone temperature of process furnace, guarantee that heating is thoroughly evenly and not overheated.
Each section of process furnace temperature is controlled automatically and automatic record with microcomputer.
Hot tool must be measured before use, must check before rolling, handle roller-way, avoids scratching tube wall.
The pipe perforation back that heats is rolled into the weldless steel tube that specification is ф 168.3mm * 14.60mm at Ф 180mmMPM tube rolling unit, and every batch is carried out once heat sampling, checks geometrical dimension; Steel pipe behind the tandem rolling enters reheating furnace, and the reheating furnace temperature is controlled between 900-930 ℃, and the control of body temperature is between 830-890 ℃ behind the sizing.
The straightening temperature of steel pipe is 512 ℃, and the unrelieved stress that the ring cutting method is measured steel pipe is 23MPa.
Through above-mentioned explained hereafter and nondestructiving inspecting test process, eligible namely becomes " the atmospheric corrosion resistance weldless steel tube that contains rare earth " of the present invention finished product.Produce sample with it and carry out mechanical properties test.
Through check, mechanical property, the metallographic structure detected value of the embodiment 1 atmospheric corrosion resistance weldless steel tube that produces see Table 3.
Embodiment 2:
The proportioning raw materials of embodiment 2, the technological process of production etc. and other technic index are all identical with embodiment 1, and difference is chemical composition content and the straightening temperature of its pipe, and chemical ingredients detected result (weight %) sees Table 2.
The straightening temperature of steel pipe is 517 ℃, and the unrelieved stress that the ring cutting method is measured steel pipe is 25MPa.
The mechanical property of table 3 steel pipe, metallographic structure detected result
Annotate: impact specimen is that laterally experimental temperature is 0 ℃.
Table 4 weather-resistant test-results
The average corrosion rate that experiment records embodiment 1 and embodiment 2 is 1.17g/m
2/ h, the average corrosion rate of contrast material are 2.38g/m
2/ h, namely the average corrosion rate of embodiment only reaches 49% of contrast material, shows that material of the present invention has good atmospheric corrosion resistance.
Claims (10)
1. atmospheric corrosion resistance weldless steel tube that contains rare earth is characterized in that raw material is that 90% high-quality steel scrap blast-melted and 10% is formed by weight percent, and its chemical ingredients is respectively by weight percentage: C0.05-0.10; Si0.10-0.30; Mn1.30-1.60; P≤0.020; S≤0.005; Cr0.20-0.50; Mo0.10-0.30; Ni0.20-0.40; Cu0.30-0.50; V0.05-0.20; Ti0.01-0.03; Al0.01-0.04; Rare earth elements RE 0.0005-0.0100; Surplus is matrix Fe and the micro impurity element that can't detect; The mechanical property of product: yield strength 470～550MPa, unrelieved stress≤30MPa, traverse impact value 〉=100J/cm
2(0 ℃); Atmospheric corrosion resistance is good.
2. a kind of atmospheric corrosion resistance weldless steel tube that contains rare earth according to claim 1 is characterized in that RE is the norium of Ce and La, and its weight percent is: Ce67%, La33%.
3. the production method of the atmospheric corrosion resistance weldless steel tube that contains rare earth of feature according to claim 1 is characterized in that technological process of production summary is: hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → round billet continuous casting → cutting → heating of pipe blank → perforation → tandem rolling → reheat → sizing → aligning → cooling → sawing → flaw detection.
4. a kind of production method that contains the atmospheric corrosion resistance weldless steel tube of rare earth according to claim 3 is characterized in that blast-melted through pre-treatment, makes that S content is reduced to weight percent below 0.010% in the molten iron; Pretreated molten iron and high-quality steel scrap are added top and bottom combined blown converter by design proportion respectively, adopt single slag technology to smelt, control finishing slag basicity and terminal point target; Carry out deoxidation alloying in the tapping process, final deoxygenation adopts aluminium deoxidation technology, and tapping process must pushing off the slag or skimmed adding lime piece after the tapping process interalloy adds.
5. a kind of production method that contains the atmospheric corrosion resistance weldless steel tube of rare earth according to claim 3 is characterized in that carrying out concise at the LF stove; The refining whole process is normal Argon on request, adopts from rudimentary and counts to the mode heat temperature raising that senior number improves heat-up rate gradually; Carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature; The white slag operation is made in employing.
6. according to claim 3 or 5 described a kind of production methods that contain the atmospheric corrosion resistance weldless steel tube of rare earth, it is characterized in that the refining of LF stove finishes the back and keeps bottom soft blow Ar, by predetermined add-on feeding rare-earth wires.
7. a kind of production method that contains the atmospheric corrosion resistance weldless steel tube of rare earth according to claim 3 is characterized in that carrying out the vacuum treated vacuum tightness≤0.10KPa of VD, dark vacuum time 〉=13 minutes.
8. according to claim 3 or 7 described a kind of production methods that contain the atmospheric corrosion resistance weldless steel tube of rare earth, feeding fixed length silico-calcium silk carries out blowing in 8～10 minutes Ar behind hello the silk when it is characterized in that the VD vacuum-treat.
9. a kind of production method that contains the atmospheric corrosion resistance weldless steel tube of rare earth according to claim 3 when it is characterized in that carrying out round billet continuous casting, adopts constant speed control and the induction stirring technology of low pulling rate and controls molten steel overheat≤30 ℃; Strand is aligned after going out the secondary cooling zone territory, is cut into circular pipe blank then.
10. a kind of production method that contains the atmospheric corrosion resistance weldless steel tube of rare earth according to claim 3 is characterized in that adopting non-modifier treatment technology, and finishing temperature is controlled between 830～890 ℃, to reach the effect of rolling normalizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101683538A CN103290334A (en) | 2013-05-09 | 2013-05-09 | Atmosphere corrosion resistance seamless steel tube containing rare earth and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101683538A CN103290334A (en) | 2013-05-09 | 2013-05-09 | Atmosphere corrosion resistance seamless steel tube containing rare earth and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103290334A true CN103290334A (en) | 2013-09-11 |
Family
ID=49091851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101683538A Pending CN103290334A (en) | 2013-05-09 | 2013-05-09 | Atmosphere corrosion resistance seamless steel tube containing rare earth and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103290334A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667929A (en) * | 2013-11-27 | 2014-03-26 | 包头钢铁（集团）有限责任公司 | Low-cost and H2S-corrosion-resistant L390NS pipeline tube containing rare earth and production method of pipeline tube |
| CN107326262A (en) * | 2017-06-22 | 2017-11-07 | 内蒙古包钢钢联股份有限公司 | The spud leg of marine drilling platform containing rare earth 800MPa seamless steel pipes and its working system method |
| CN108642375A (en) * | 2018-04-23 | 2018-10-12 | 包头钢铁（集团）有限责任公司 | The manufacturing method of Micro Alloying micro-alloy steel pipe and Micro Alloying micro-alloy steel pipe |
| CN109778060A (en) * | 2019-03-26 | 2019-05-21 | 内蒙古锦和稀土功能材料有限公司 | Rare earth alloy and its preparation method and application |
| CN110760753A (en) * | 2019-10-25 | 2020-02-07 | 鞍钢股份有限公司 | Low-yield-ratio seamless steel pipe and manufacturing method thereof |
| CN110923572A (en) * | 2019-11-27 | 2020-03-27 | 上海大学 | Rare earth weathering steel rich in alloying rare earth elements and manufacturing method thereof |
| CN110983156A (en) * | 2019-11-27 | 2020-04-10 | 上海大学 | Rare earth corrosion-resistant steel rich in alloying rare earth elements and manufacturing method thereof |
| CN113293336A (en) * | 2021-04-13 | 2021-08-24 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth non-quenched and tempered free-cutting hot-rolled round steel with yield strength of 500MPa |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235469A (en) * | 2008-02-28 | 2008-08-06 | 武汉钢铁(集团)公司 | High-strength easy-formation atmospheric corrosion resisting steel |
| CN101660095A (en) * | 2009-09-17 | 2010-03-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Manufacturing method of atmosphere corrosion resistance steel |
| CN102251180A (en) * | 2011-07-07 | 2011-11-23 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing ultrahigh strength collapse-resistant petroleum casing and production method thereof |
-
2013
- 2013-05-09 CN CN2013101683538A patent/CN103290334A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235469A (en) * | 2008-02-28 | 2008-08-06 | 武汉钢铁(集团)公司 | High-strength easy-formation atmospheric corrosion resisting steel |
| CN101660095A (en) * | 2009-09-17 | 2010-03-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Manufacturing method of atmosphere corrosion resistance steel |
| CN102251180A (en) * | 2011-07-07 | 2011-11-23 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing ultrahigh strength collapse-resistant petroleum casing and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 米丰毅等: "稀土对低碳钢耐工业大气腐蚀性的电化学保护作用研究", 《材料保护》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667929A (en) * | 2013-11-27 | 2014-03-26 | 包头钢铁（集团）有限责任公司 | Low-cost and H2S-corrosion-resistant L390NS pipeline tube containing rare earth and production method of pipeline tube |
| CN107326262A (en) * | 2017-06-22 | 2017-11-07 | 内蒙古包钢钢联股份有限公司 | The spud leg of marine drilling platform containing rare earth 800MPa seamless steel pipes and its working system method |
| CN108642375A (en) * | 2018-04-23 | 2018-10-12 | 包头钢铁（集团）有限责任公司 | The manufacturing method of Micro Alloying micro-alloy steel pipe and Micro Alloying micro-alloy steel pipe |
| CN109778060A (en) * | 2019-03-26 | 2019-05-21 | 内蒙古锦和稀土功能材料有限公司 | Rare earth alloy and its preparation method and application |
| CN110760753A (en) * | 2019-10-25 | 2020-02-07 | 鞍钢股份有限公司 | Low-yield-ratio seamless steel pipe and manufacturing method thereof |
| CN110923572A (en) * | 2019-11-27 | 2020-03-27 | 上海大学 | Rare earth weathering steel rich in alloying rare earth elements and manufacturing method thereof |
| CN110983156A (en) * | 2019-11-27 | 2020-04-10 | 上海大学 | Rare earth corrosion-resistant steel rich in alloying rare earth elements and manufacturing method thereof |
| CN113293336A (en) * | 2021-04-13 | 2021-08-24 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth non-quenched and tempered free-cutting hot-rolled round steel with yield strength of 500MPa |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102367550B (en) | Rare-earth-containing wet H2S corrosion resisting steel pipe used in heat exchanger, and production method thereof | |
| CN102251180A (en) | Rare-earth-containing ultrahigh strength collapse-resistant petroleum casing and production method thereof | |
| CN103290334A (en) | Atmosphere corrosion resistance seamless steel tube containing rare earth and production method thereof | |
| CN103343293A (en) | Rare earth containing, high strength and high toughness seamless steel pipe used for gas cylinder and production method thereof | |
| CN103602904A (en) | Rare earth containing low-cost seamless steel pipe for L415N pipeline and production method thereof | |
| CN108531806B (en) | A kind of high-strength tenacity hot rolled seamless steel tube and preparation method thereof | |
| CN103276310A (en) | Rare-earth-containing H-shaped steel with low-temperature toughness and production method thereof | |
| CN103602905A (en) | Rare earth containing, high-strength and high-toughness seamless steel pipe for L555Q pipeline and production method thereof | |
| CN103266279A (en) | Rare earth containing H profile steel with high strength and high toughness and production method thereof | |
| CN103290338A (en) | Rare earth-containing seamless steel tube for L690Q pipeline and production method thereof | |
| CN103556069A (en) | Large-diameter seamless steel tube for high-pressure gas cylinders and manufacturing method thereof | |
| CN103409702A (en) | Seamless steel pipe for L830Q pipeline containing rare earth and production method of seamless steel pipe | |
| CN103276308A (en) | Rare earth-containing high-strength atmospheric corrosion-resistant seamless steel pipe and production method thereof | |
| CN103361558B (en) | A kind of containing rare earth moisture-proof H 2the T95 steel grade oil well casing of S corrosion and production method thereof | |
| CN103320699B (en) | A kind of containing rare earth moisture-proof H 2the seamless steel pipe for gas cylinder of S corrosion and production method thereof | |
| CN104651723B (en) | Rare earth contained oil casing with high hydrogen sulfide corrosion resistance and collapse resistance, and production method of oil casing | |
| CN103276309A (en) | Rare earth-containing wet H2S corrosion-resistant seamless steel pipe for hydraulic bracket and production method thereof | |
| CN103215517A (en) | Seamless steel pipe for rare-earth-containing humidity-resistant and H2S corrosion resistant L485QS pipeline and production method thereof | |
| CN103526121B (en) | A kind of anti scuffing mandrel material | |
| CN104313474A (en) | Seamless steel tube for rare earth containing low-cost H2S corrosion-resistant L320NS pipeline and production method thereof | |
| CN104651717B (en) | A kind of X80 steel-grade low temperature seamless pipeline steel tube and its production method containing rare earth | |
| CN102330018A (en) | Seamless steel tube used for thick-wall petroleum casing collar material and production method thereof | |
| CN103343296A (en) | Rare earth containing seamless steel pipe used for hydraulic support and production method thereof | |
| CN103215518B (en) | Containing the resistance to H of rare earth 2the preparation method of S corroded pipeline weldless steel tube | |
| CN103469085A (en) | Rare earth (RE)-containing special petroleum casing for heavy oil thermal recovery wells and production 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 | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130911 |