CN102851587B - Anti-deformation X80-X100 pipeline steel plate - Google Patents
Anti-deformation X80-X100 pipeline steel plate Download PDFInfo
- Publication number
- CN102851587B CN102851587B CN201210327206.6A CN201210327206A CN102851587B CN 102851587 B CN102851587 B CN 102851587B CN 201210327206 A CN201210327206 A CN 201210327206A CN 102851587 B CN102851587 B CN 102851587B
- Authority
- CN
- China
- Prior art keywords
- steel plate
- deformation
- equal
- pipeline steel
- less
- 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
Images
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The present invention discloses an anti-deformation X80-X100 pipeline steel plate and a manufacturing method thereof. The pipeline steel plate comprises the following components, by weight, 0.04-0.09% of C, 0.10-0.50% of Si, 1.0-2.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.05-0.11% of Nb, 0.010-0.025% of Ti, less than or equal to 0.30% of Mo, less than or equal to 0.40% of Cu, less than or equal to 0.50% of Ni, less than or equal to 0.40% of Cr, and the balance of Fe. The manufacturing method for the X80-X100 pipeline steel plate comprises: sequentially carrying out process treatments of control rolling, relaxation, pre-straightening and control cooling on a plate billet having corresponding chemical components of the anti-deformation X80-X100 pipeline steel plate described in the claim 1. The resulting pipeline steel plate of the present invention has characteristics of good toughness, good deformation resistance (low yield ratio, high stress ratio and high uniform elongation rate, wherein the yield ratio is less than or equal to 0.80, the Rt1.5/Rt0.5 is more than or equal to 1.13, and the uniform elongation rate is more than or equal to 10.5%), and very flat hot-rolled plate shape, and is especially suitable for petroleum natural gas pipeline engineering projects based on anti-strain design.
Description
Technical field
The present invention relates to a kind of pipeline steel and preparation technology thereof, particularly a kind of resistance to deformation X80-X100 Pipeline Steel Plate and the manufacture method thereof that can use in the engineering projects such as oil and gas pipeline, belongs to high strength low-carbon micro-alloyed steel manufacturing technology field.
Background technology
Along with the continuous growth of energy demand, remote oil-gas mining and conveying have become inevitable, and transport pipe, by the geologic condition unstable region through a large amount of, as seismic zone, rubble flow, tundra etc., has a strong impact on the safety of pipeline.As being built in oil pipeline in 1973, China's Golmud-Lhasa oil pipeline is built in 1973, be article one permafrost region oil pipeline that China builds, total length 1076km, moves over more than 30 year due to reasons such as thaw settlements, this pipeline once occurred 30 times and leaked, and had caused very large financial loss.For this reason, at geologic condition unstable region, pipework has adopted " based on stress design " theory, requires pipe line steel not only to possess good low-temperature toughness, also there is non-deformability (low yield strength ratio, heavily stressed when high uniform elongation), reach the ability of resisting anti-external shock.Yet traditional acicular ferrite pipe line steel, because of its higher yield tensile ratio and the low factors such as uniform elongation, makes in its pipework project that can not be applied to stress design.
Adopt low-carbon microalloyed and traditional TMCP technique can only produce acicular ferrite pipe line steel, and high strength resistance to deformation pipeline copper how the to produce good-toughness technical barrier that to be those skilled in the art thirst for always solves.
Summary of the invention
One of object of the present invention is for the deficiencies in the prior art, a kind of resistance to deformation X80-X100 Pipeline Steel Plate is provided, it possesses good low-temperature flexibility and anti-deformation (low yield strength ratio, heavily stressed when high uniform elongation) and very smooth hot rolled plate shape, is particularly useful for the petroleum-gas pipeline engineering project of " based on anti-stress design ".
For reaching this goal of the invention, X80-X100 Pipeline Steel Plate of the present invention has adopted following design of components, and it comprises the following component counting by weight percentage: C=0.04～0.09%, Si=0.10～0.50%, Mn=1.0～2.0%, P≤0.015%, S≤0.005%, Nb=0.05～0.11%, Ti=0.010～0.025%, Mo≤0.30%, Cu≤0.40%, Ni≤0.50%, Cr≤0.40%, rest part comprises Fe.
The Main Function of aforementioned each chemical composition is as follows:
Carbon (C): carbon is the principal element that affects pipeline steel strength, toughness, hardness and welding property, the increase of carbon content, has obvious effect to improving the intensity of steel.But the increase meeting of carbon content has negative impact to the ductility of steel, toughness and welding property.So the carbon content that the present invention selects is 0.04-0.09%, be mainly to consider that too low carbon can make the yield tensile ratio of steel plate increase on the one hand, be mainly to consider the toughness of steel plate and good welding property on the other hand.
Manganese (Mn): solution strengthening element, both can improve the intensity of steel and also can improve the toughness of steel.Appropriateness improves the hardening capacity of steel, expands γ phase region, reduces γ → α transformation temperature of steel, contributes to obtain tiny phase-change product.In addition, manganese can also improve the solubleness of microalloy element niobium (Nb) in steel, suppresses separating out of niobium carbonitrides.Therefore the manganese content that, steel of the present invention adopts is 1.0～2.0%.
Niobium (Nb): niobium is effective grain refining element, can significantly suppress Austenite Grain Growth, postpones γ → α and changes, thereby obtains more tiny tissue.In course of hot rolling, the niobium carbonitrides of separating out can postpone the growth process of recrystallize and crystal grain, and niobium carbonitrides, by pinning dislocation, makes can retain more dislocation desity in matrix, improves intensity and the toughness of steel.The niobium of solid solution condition can postpone γ → α to be changed, refinement ferrite crystal grain, and the toughness of raising steel, in process of cooling, the niobium of solid solution can continue to separate out with Nb (CN), further improves the intensity of steel.In the present invention, adopt the high niobium design of 0.05-0.11%, embodied above analysis spirit, reach and substitute the thinning microstructure of Mo, the effect of precipitation strength, reduce the cost of steel.
Titanium (Ti): titanium is strong nitrogen killer, can form TiN particle with nitrogen, thereby can in blank heating process, suppress the alligatoring of austenite crystal, plays the effect of crystal grain thinning, improves the low-temperature flexibility of steel; Equally, TiN particle can play good restraining effect to growing up of welded heat affecting zone crystal grain, improves welding property.In addition, titanium can be separated out with niobium is compound, improves (TiNb) thermostability (CN), to blank austenite crystal in heat-processed grow up and good restraining effect is played in the alligatoring of welded heat affecting zone crystal grain, improve the toughness of steel plate, improve the welding property of steel plate.The add-on of titanium is generally not less than 3.4 times of nitrogen, and the add-on of asking titanium in invention is 0.01-0.025%.
Copper (Cu): copper can improve the intensity of steel plate and welded heat affecting zone, the precipitating action of copper can also improve the anti-fatigue performance of steel; In addition, another effect of copper is the corrosion resistance nature that improves steel plate, closely adds 0.1% copper just can significantly improve the resistance to atmospheric corrosion of steel.But excessive copper is disadvantageous to the toughness of welded heat affecting zone and welding zone, steel of the present invention has adopted the add-on that is not more than 0.4%.
Chromium (Cr): chromium is carbide forming element equally, can improve steel plate hardness, plays the effect of precipitation strength; Chromium, as ferrite former, can obtain more acicular ferrite structure in high Nb steel; Chromium can also improve the anticorrosive and resistance to hydrogen induced cracking (HIC) performance of steel.Still and, excessive chromium will reduce the extension property of steel plate, promote growing up of crystal grain and affect toughness, cause the generation of the cold crack of welding region.Therefore, only adopted relatively safe add-on in the present invention, steel of the present invention has adopted the add-on that is not more than 0.4%.
Nickel (Ni): nickel improves the intensity of steel by solution strengthening, compares with Mo, and the nickel adding tends to form sclerosis phase still less, thereby favourable to low-temperature flexibility; Meanwhile, nickel also contributes to improve and in steel, adds the red brittleness that copper causes.Steel of the present invention has adopted the add-on that is not more than 0.5%.
Another object of the present invention is to provide a kind of method of preparing aforementioned resistance to deformation X80-X100 pipe line steel, the method be on the basis of aforementioned component design (, high Nb and other alloy proportion), by adopting CRPC technique, regulate and control out the resistance to deformation X80-X100 pipe line steel that polyphase structure forms, and obtain the good heterogeneous resistance to deformation of good hot rolled plate shape.Aforementioned CRPC technique can be regarded as: C (control rolling controlled rolling)+R (relaxing relaxation)+P (pre-hot leveler pre-straightening)+C (control cooling control is cold).
As one aspect of the present invention, the preparation method of this resistance to deformation X80-X100 Pipeline Steel Plate can comprise following flow process: according to the design of aforementioned steel grades carry out the cooling → hot straightening → cold bed of reheat → temperature of get the raw materials ready → molten iron pre-desulfurization → converter smelting of proportioning → LF refining → RH processings → sheet billet continuous casting → slab controlled rolling → relaxation air cooling → pre-straightening → accelerate cooling → UT flaw detection → shear → put in storage.
And wherein, the CRPC optimal process of this resistance to deformation X80-X100 steel plate is: 1100 ℃～1250 ℃ of slab heating temperatures, 940 ℃～110 ℃ of recrystallization zone rolling temperatures, 800 ℃～920 ℃ of non-recrystallization zone start rolling temperatures, non-recrystallization zone total reduction 60%-90%, 700 ℃～820 ℃ of finishing temperatures; Roll rear steel plate and adopt relaxation air cooling+pre-straightening+accelerate the cooling polyphase structure regulation and control of carrying out, relaxation air cooling is to transformation temperature Ar
3after 10 ℃ below～100 ℃, enter the pre-straightening of pre-straightening machine, then enter fast and accelerate coolingly, accelerate 10～50 ℃/s of speed of cooling, final temperature is 260 ℃～500 ℃.
By the resistance to deformation X80-X100 Pipeline Steel Plate that aforementioned component designs and preparation technology obtains, there is following mechanical property:
1) comprehensive mechanical property of X80 level resistance to deformation pipe line steel steel plate: cross directional stretch yield strength 510-600MPa, tensile strength 650-775MPa, elongation after fracture A
50>=34%, yield tensile ratio≤0.80; Longitudinal stretching yield strength 490-540MPa, tensile strength 650-750MPa, elongation after fracture A
50>=38%, yield tensile ratio≤0.78, stress ratio Rt 1.5/Rt 0.5>=1.13, Rt 2.0/Rt 1.0>=1.08, uniform elongation UEL>=10.5%;-20 ℃ of Charpy impact toughness mean value>=250J, the Drop-Weight Tear Test (DWTT) shear area average percent (DWTT SA%)>=85% of-15 ℃;
2) comprehensive mechanical property of X100 level resistance to deformation pipe line steel steel plate: cross directional stretch yield strength 690-760MPa, tensile strength 890-930MPa, elongation after fracture A
50>=26%, yield tensile ratio≤0.80; Longitudinal stretching yield strength 680-720MPa, tensile strength 870-890MPa, elongation after fracture A
50>=30%, yield tensile ratio≤0.78, stress ratio Rt 1.5/Rt 0.5>=1.15, Rt 2.0/Rt 1.0>=1.05, uniform elongation UEL>=8.0%;-20 ℃ of Charpy impact toughness mean value>=250J, the Drop-Weight Tear Test (DWTT) shear area average percent (DWTT SA%)>=85% of-15 ℃.
Accompanying drawing explanation
Fig. 1 is the metallographic structure photo of resistance to deformation X80 steel plate in embodiment 1;
Fig. 2 is the metallographic structure photo of resistance to deformation X80 steel plate in embodiment 2;
Fig. 3 is the metallographic structure photo of resistance to deformation X80 steel plate in embodiment 3;
Fig. 4 is the metallographic structure photo of resistance to deformation X80 steel plate in embodiment 4;
Fig. 5 is the metallographic structure photo of resistance to deformation X80 steel plate in embodiment 5;
Fig. 6 is the metallographic structure photo of resistance to deformation X80 steel plate in embodiment 6;
Fig. 7 is the EBSD analysis chart of resistance to deformation X80 steel in embodiment 1;
Fig. 8 is the TEM photo of resistance to deformation X80 pipe line steel in embodiment 1, wherein: (a) ferritic phase JianMA island light field phase, (b) ferritic phase JianMA island details in a play not acted out on stage, but told through dialogues phase, (c) ferrite/bainite and ShangMA island, interface (d) bainite ferrite thereof and MA film therebetween, (e) lower bainite/ferrite/bainite ferrite, (f) precipitated phase in ferrite.
Embodiment
Below in conjunction with embodiment 1-6 and accompanying drawing 1-8, technical scheme of the present invention is further described, wherein, the Composition Design of the resistance to deformation X80-X100 Pipeline Steel Plate that this embodiment 1-6 is related is consulted table 1.And the preparation technology of this embodiment 1-6 can comprise following flow process: according to steel grades shown in table 1 design carry out the cooling → hot straightening → cold bed of reheat → temperature of get the raw materials ready → molten iron pre-desulfurization → converter smelting of proportioning → LF refining → RH processings → sheet billet continuous casting → slab controlled rolling → relaxation air cooling → pre-straightening → accelerate cooling → UT flaw detection → shear → put in storage.
Further, the specification of each steel plate that this embodiment 1-6 is related and CRPC processing parameter thereof can be consulted table 2, and its metallographic structure photo can be consulted Fig. 1-5, obviously, can see, the weave construction of the related steel matrix of this embodiment 1-6 is: Polygons/quasi-polygonal ferrite+bainite+MA constituent element+nano level precipitated phase, the wherein volume fraction 30%～70% of soft phase (Polygons/quasi-polygonal ferrite).
In addition, Mechanics Performance Testing with reference to the standard of API Spec 5L-2007 to the related steel plate of previous embodiment 1-6, also can obtain the test result shown in table 3, these test results show, by the resulting Pipeline Steel Plate of technical scheme of the present invention, not only there is excellent toughness, good non-deformability (low yield strength ratio (≤0.80), High stress ratio (Rt
1.5/ Rt
0.5>=1.13), high uniform elongation (>=10.5%)), also there is very smooth hot rolled plate shape, be particularly useful for the petroleum-gas pipeline engineering project of " based on anti-stress design ".
Attached and, this case contriver also obtains typical sample in resistance to deformation X80 Pipeline Steel Plate to previous embodiment 1 and has carried out that EBSD analyzes and TEM tests, its result can be referring to Fig. 7-Fig. 8.
Above-described embodiment is only explanation technical conceive of the present invention and feature; its object is to allow person skilled in the art can understand content of the present invention and implement according to this; can not limit the scope of the invention with this; all equivalences that spirit is done according to the present invention change or revise, within all should being encompassed in protection scope of the present invention.
The chemical composition example (wt%) of table 1 resistance to deformation X80-X100 steel plate
Rolling technology (CRPC technique) and the respective organization metallograph of table 2 resistance to deformation X80-X100 steel plate
The mechanical property of table 3 resistance to deformation X80-X100 steel plate
Note: the mechanical property test of this resistance to deformation X80/X100 steel plate is carried out according to API Spec 5L-2007.
Claims (1)
1. a resistance to deformation X80-X100 Pipeline Steel Plate, is characterized in that, it comprises the following component counting by weight percentage: C=0.07～0.09%, Si=0.10～0.50%, Mn=1.0～2.0%, P≤0.015%, S≤0.005%, Nb=0.07～0.11%, Ti=0.010～0.025%, Mo≤0.30%, Cu0.03～0.40%, Ni0.50%, Cr≤0.40%, rest part comprises Fe;
The manufacture method of described resistance to deformation X80-X100 Pipeline Steel Plate comprises to be processed the slab having with described resistance to deformation X80-X100 Pipeline Steel Plate corresponding chemical composition successively through controlled rolling, relaxation, pre-straightening and control cooling working procedure, wherein,
In controlled rolling operation, 1100 ℃～1250 ℃ of slab heating temperatures, 940 ℃～1100 ℃ of recrystallization zone rolling temperatures, 800 ℃～920 ℃ of non-recrystallization zone start rolling temperatures, non-recrystallization zone total reduction 60%～90%, 700 ℃～770 ℃ of finishing temperatures;
Roll rear steel plate relaxation air cooling to transformation temperature Ar
3after 10 ℃ below～100 ℃, enter the pre-straightening of pre-straightening machine, then enter fast acceleration cooling, accelerate 10～50 ℃/s of speed of cooling, final temperature is 260 ℃～500 ℃, finally obtain Polygons/quasi-polygonal ferrite+nano level precipitated phase+bainite+MA constituent element polyphase structure, the volume fraction of Polygons/quasi-polygonal ferrite is 30%～70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327206.6A CN102851587B (en) | 2012-09-06 | 2012-09-06 | Anti-deformation X80-X100 pipeline steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327206.6A CN102851587B (en) | 2012-09-06 | 2012-09-06 | Anti-deformation X80-X100 pipeline steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102851587A CN102851587A (en) | 2013-01-02 |
| CN102851587B true CN102851587B (en) | 2014-02-12 |
Family
ID=47398558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210327206.6A Active CN102851587B (en) | 2012-09-06 | 2012-09-06 | Anti-deformation X80-X100 pipeline steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102851587B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215527A (en) * | 2013-04-24 | 2013-07-24 | 马钢(集团)控股有限公司 | High-strength and high-toughness X100 pipeline hot rolled steel sheet and production method thereof |
| CN103352176B (en) * | 2013-06-20 | 2015-06-03 | 中国石油天然气集团公司 | Air-cooling type 80H thermal production well casing based on strain design and production process thereof |
| CN103643170A (en) * | 2013-12-06 | 2014-03-19 | 马钢(集团)控股有限公司 | High-strength high-toughness X100 pipeline steel hot-rolled coiled plate and production method thereof |
| JP6343472B2 (en) * | 2014-03-28 | 2018-06-13 | 株式会社神戸製鋼所 | Steel sheets for high-strength line pipes and steel pipes for high-strength line pipes with excellent low-temperature toughness |
| CN104372261A (en) * | 2014-11-19 | 2015-02-25 | 钢铁研究总院 | High-ductility X80 pipeline steel plate for alpine region and production method of high-ductility X80 pipeline steel plate |
| CN104404383A (en) * | 2014-11-28 | 2015-03-11 | 钢铁研究总院 | Ultra-low carbon hydrogen sulfide corrosion resistance X80 pipeline steel and preparation method |
| CN104451446B (en) * | 2014-12-05 | 2017-01-25 | 武汉钢铁(集团)公司 | Thick-gauge, high-strength and high-toughness bainite engineering steel and production method thereof |
| CN105907936A (en) * | 2016-05-10 | 2016-08-31 | 江苏沙钢集团有限公司 | Uniform phase structure and plate shape control method for high strength and toughness steel plate |
| CN112143959B (en) * | 2019-06-27 | 2022-01-14 | 宝山钢铁股份有限公司 | Steel plate with low yield ratio, high toughness and excellent weldability and manufacturing method thereof |
| CN112246910A (en) * | 2020-09-15 | 2021-01-22 | 首钢集团有限公司 | Method for improving performance uniformity of thermomechanically-rolled steel plate and thermomechanically-rolled steel plate |
| CN113278880A (en) * | 2021-04-15 | 2021-08-20 | 邯郸钢铁集团有限责任公司 | Low-yield-ratio and low-hardness submarine pipeline steel L485MO and production method thereof |
| CN113403459B (en) * | 2021-05-25 | 2023-04-07 | 中国科学院金属研究所 | Rolling method for improving low-temperature impact toughness of X80 pipeline steel through texture control |
| CN113699439B (en) * | 2021-07-27 | 2022-08-02 | 马鞍山钢铁股份有限公司 | Steel for low-yield-ratio ultrahigh-strength continuous oil pipe and manufacturing method thereof |
| CN114058978B (en) * | 2021-11-10 | 2023-03-31 | 国家石油天然气管网集团有限公司 | X80 pipeline steel with low-temperature toughness |
| CN116005071B (en) * | 2022-12-27 | 2024-05-24 | 南阳汉冶特钢有限公司 | X80 crack-arrest steel plate and production method thereof |
| CN117568706A (en) * | 2023-09-25 | 2024-02-20 | 江苏沙钢集团淮钢特钢股份有限公司 | Seamless low-temperature tee joint, seamless steel for hot bending pipe and production method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008078917A1 (en) * | 2006-12-26 | 2008-07-03 | Posco | High strength api-x80 grade steels for spiral pipes with less strength changes and method for manufacturing the same |
| CN101397626A (en) * | 2007-12-07 | 2009-04-01 | 江苏沙钢集团有限公司 | High intensity and high-toughness hot-rolled steel sheet and method for producing the same |
| CN101456034A (en) * | 2009-01-06 | 2009-06-17 | 北京科技大学 | X80 level large-deformation resistance pipe line steel medium and heavy plate production method |
| CN101619416A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | High-strength X100 pipe line steel hot rolling flat plate and method for manufacturing same |
| CN102248029A (en) * | 2011-05-31 | 2011-11-23 | 太原重工股份有限公司 | Pre-straightener for medium and thick plates |
| CN102644037A (en) * | 2012-05-16 | 2012-08-22 | 湖南华菱湘潭钢铁有限公司 | Production method of pipeline steel |
-
2012
- 2012-09-06 CN CN201210327206.6A patent/CN102851587B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008078917A1 (en) * | 2006-12-26 | 2008-07-03 | Posco | High strength api-x80 grade steels for spiral pipes with less strength changes and method for manufacturing the same |
| CN101397626A (en) * | 2007-12-07 | 2009-04-01 | 江苏沙钢集团有限公司 | High intensity and high-toughness hot-rolled steel sheet and method for producing the same |
| CN101619416A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | High-strength X100 pipe line steel hot rolling flat plate and method for manufacturing same |
| CN101456034A (en) * | 2009-01-06 | 2009-06-17 | 北京科技大学 | X80 level large-deformation resistance pipe line steel medium and heavy plate production method |
| CN102248029A (en) * | 2011-05-31 | 2011-11-23 | 太原重工股份有限公司 | Pre-straightener for medium and thick plates |
| CN102644037A (en) * | 2012-05-16 | 2012-08-22 | 湖南华菱湘潭钢铁有限公司 | Production method of pipeline steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102851587A (en) | 2013-01-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102851587B (en) | Anti-deformation X80-X100 pipeline steel plate | |
| CN101397626B (en) | High intensity and high-toughness hot-rolled steel sheet and method for producing the same | |
| CN103352167B (en) | A kind of low yield strength ratio high strength bridge steel plate and manufacture method thereof | |
| CN105463324B (en) | A kind of thick-specification high-tenacity pipe line steel and its manufacture method | |
| CN102828120B (en) | Strain design based economical pipe line steel and its manufacturing method | |
| CN103834874B (en) | Heavy wall height DWTT performance X65-70 subsea pipeline steel and manufacture method | |
| CN102828125B (en) | Strain design based pipe line steel X70 and its manufacturing method | |
| CN103469098B (en) | A kind of X80 pipe line steel and production method thereof with good Properties of HIC resistance | |
| JP5499731B2 (en) | Thick high-tensile hot-rolled steel sheet with excellent HIC resistance and method for producing the same | |
| CN111996449B (en) | Pipeline thick plate with excellent plastic toughness and production method thereof | |
| CN108677096A (en) | A kind of strategic oil reserve tank steel plate and its manufacturing method based on Oxide Metallurgy | |
| WO2016095616A1 (en) | Good fatigue- and crack growth-resistant steel plate and manufacturing method therefor | |
| CN108368594A (en) | High strength steel and its manufacturing method with excellent low temperature strain-aging impact characteristics and welding heat affected zone impact characteristics | |
| CN110527915B (en) | 460 MPa-level hot-rolled H-shaped steel and production method thereof | |
| CN111893386B (en) | Thick plate for deepwater pipeline designed based on plastic deformation and crush resistance and production method thereof | |
| WO2016041491A1 (en) | 550 mpa high temperature-resistant pipeline steel and manufacturing method thereof | |
| CN102560284A (en) | High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof | |
| CN104937124A (en) | HOT-ROLLED STEEL PLATE FOR HIGH-STRENGTH LINE PIPE AND HAVING TENSILE STRENGTH OF AT LEAST 540 MPa | |
| CN109023068B (en) | Steel plate for VC (polyvinyl chloride) nanoparticle reinforced X90 plastic pipe and manufacturing method thereof | |
| CN111996461A (en) | X70 pipeline coiled plate for microalloyed resistance welded pipe and production method thereof | |
| CN101413090B (en) | High-strength high-toughness X80 hot rolling coiled sheet for spiral buried arc welding and production method thereof | |
| CN109136756B (en) | NbC nanoparticle reinforced X90 plastic pipe steel plate and manufacturing method thereof | |
| CN109957709B (en) | V-containing large-deformation X70M pipeline steel plate and manufacturing method thereof | |
| CN109957710B (en) | V-containing large-deformation X80M pipeline steel plate and manufacturing method thereof | |
| CN106319388A (en) | 80 kg-level low preheating type high-strength steel plate and manufacturing 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 |