CN104073744A - High-toughness X80 pipeline steel plate coil with thickness greater than or equal to 18.5mm and production method - Google Patents
High-toughness X80 pipeline steel plate coil with thickness greater than or equal to 18.5mm and production method Download PDFInfo
- Publication number
- CN104073744A CN104073744A CN201410233726.XA CN201410233726A CN104073744A CN 104073744 A CN104073744 A CN 104073744A CN 201410233726 A CN201410233726 A CN 201410233726A CN 104073744 A CN104073744 A CN 104073744A
- Authority
- CN
- China
- Prior art keywords
- equal
- less
- steel
- temperature
- thickness
- 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.)
- Granted
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a high-toughness X80 pipeline steel plate coil with thickness greater than or equal to 18.5mm, which comprises the following chemical components in percentage by weight: 0.025-0.055% of C, 0.10-0.35% of Si, 1.85-2.00% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0015% of S, 0.15-0.30% of Cu, 0.20-0.40% of Cr, 0.15-0.40% of Ni, 0.20-0.40% of Mo, 0.070-0.095% of Nb, 0.015-0.040% of V, 0.005-0.025% of Ti, 0.015-0.045% of Al, less than or equal to 0.008% of N and 0.0010-0.0040% of Ca. A production method comprises the following steps: heating a casting blank to 1,100-1,180 DEG C; performing rough rolling, finish rolling, water cooling, coiling and air cooling to room temperature. Through the invention, the thickness of a produced steel plate is greater than 18.4mm, the tissue and performance in the thickness direction are uniform, and mechanical properties are as follows: the yield strength (Rt0.5) is greater than or equal to 570MPa, the tensile strength (Rm) is greater than or equal to 625MPa, the yield ratio (Rt0.5/Rm) is less than or equal to 0.90, the elongation (A50mm) is greater than or equal to 40%, the KV2 at -20 DEG C is greater than or equal to 300J, and the DWTTSA at -15 DEG C is greater than or equal to 85%.
Description
Technical field
The present invention relates to a kind of oil pipeline steel and production method thereof, belong to particularly high tenacity X80 pipe line steel coiled sheet and the production method of a kind of thickness >=18.5mm, it is applicable to long distance pipeline trunk main and builds required pipe line steel in one, two class areas.
Background technology
Along with the high speed development of world economy, the demand of oil, Sweet natural gas equal energy source resource is grown with each passing day, the construction of oil, Long-distance Transmission Pipeline obtains flourish.For improving the transport efficiency of long distance pipeline and the economy of operation, in recent years, transfer pressure and the caliber of pipeline constantly increase, the domestic and international great engineering in pipeline trunk main such as U.S.'s Alaska pipeline, Zhejiang, the new Guangdong of China line that Russian Bovanenkovo – Uhta pipeline, China of at present hot work in progress transfers natural gas from the west to the east three lines, Central Asia pipeline and completed planning all adopts the high pressure of 12MPa, and caliber reaches even 1422mm of 1219mm.For ensureing the security of this class high pressure long distance pipeline operation, long distance pipeline generally adopts heavy wall X80 pipe line steel, and in order to reduce pipe-line construction cost, adopt traditionally two class areas of thick-wall pipeline steel plate also to start to attempt pipe line steel coiled sheet, it is even higher that the thickness of starting material coiled sheet will reach 21.4mm, 22mm.Along with the increase of strip thickness, ensure that its homogeneity with good low temperature fracture toughness and structure property becomes stern challenge, and the stably manufactured that how to realize heavy wall X80 pipe line steel coiled sheet is a very thorny technical barrier equally.
Through retrieval, Chinese Patent Application No. is 200410013265.1 patent documentation, it discloses a kind of " high-intensity high-tenacity line of pipes steel and preparation method thereof ", it adopts low C, high Mn, high Nb, without Cr, V, add on a small quantity the Composition Design of the alloying elements such as Cu, Ni, Mo, manufacture the method for high grade of steel X80 hot continuous rolling coiled sheet in conjunction with TMCP technique.There is hardening capacity deficiency in the document, and curling temperature higher (400～600 DEG C), and be only applicable to produce the hot continuous rolling X80 pipe line steel of thinner specification (18.4mm is following), and in steel plate thickness direction, tissue and low temperature fracture toughness can not meet the demands.
Chinese Patent Application No. is the patent documentation of 201210022461.X, it discloses " a kind of high strength and low cost toughness X80 pipe line steel roll bending and production method thereof ", it adopts low C, high Mn, low Mo, high Nb, without Cu, Ni, V, a small amount of Composition Design that adds the alloying elements such as Cr, in conjunction with the method for TMCP explained hereafter X80 pipe line steel roll bending.The deficiency of its existence be difficult to equally realize thickness at the above X80 pipe line steel of 18.5mm coiled sheet the matched well to high strength and high tenacity.
Chinese Patent Application No. is 200910048140.5 patent documentation, it discloses " a kind of X80 pipe line steel Wide and Thick Slab and manufacture method thereof ", it adopts low C, high Mn, low Mo, high Nb, high Cr, a small amount of Composition Design that adds the alloying elements such as Cu, Ni, in conjunction with the method for TMCP explained hereafter X80 pipe line steel Wide and Thick Slab.Rear final cooling temperature higher (400～600 DEG C) is rolled in its existence, is difficult to equally realize tissue, the performance requriements of special thick specification pipe line steel coiled sheet, and it adopts the mode of plate of moderate thickness uni-tension rolling to produce, and production efficiency and lumber recovery are all lower, and manufacturing cost is higher.
Summary of the invention
The thickness that the present invention solves prior art is no more than 18.4mm, and has hardening capacity deficiency, thickness of slab directional performance is inhomogeneous, fracture toughness property is poor deficiency, and a kind of thickness>=18.5mm is provided), R
t0.5>=570MPa, R
m>=625MPa ,-20 DEG C of KV
2>=300J, X80 level pipe line steel coiled sheet and the production method thereof of-15 DEG C of DWTT SA>=85%.
The application to achieve these goals, the alloying element and the technique that play impact or keying action on the object that realizes the application conduct in-depth research its result, in order to realize the object described in the application, therefore proposed aspect composition is mainly to have adopted appropriate reduction carbon element content, improve the alloying element content that Cu, Cr, Ni, Mo etc. improve hardening capacity, and the method for compound interpolation Nb, V, Ti microalloying, solve rear rate of cooling and the finish rolling draft inadequate problem of structure refinement causing that declines of rolling causing after coiled sheet thickness increases; The optimization of composition, also need the technique of coupling, therefore, the application after deliberation, process aspect is mainly to have taked low-temperature heat, low temperature to depress greatly roughing and the measure such as very low temperature is curling, further the finished product tissue after refinement original austenite grains size and phase transformation, improves the structure property homogeneity on thickness direction.
Realize the measure of above-mentioned purpose:
The high tenacity X80 pipe line steel coiled sheet of thickness>=18.5mm, its chemical composition and weight percent are: C:0.025～0.055, Si:0.10～0.35, Mn:1.85～2.00, P :≤0.012, S≤0.0015, Cu:0.15～0.30, Cr:0.20～0.40, Ni:0.15～0.40, Mo:0.20～0.40, Nb:0.070～0.095, V:0.015 ~ 0.040, Ti:0.005～0.025, Al:0.015～0.045, N :≤0.008, Ca:0.0010～0.0040, and surplus is Fe and is inevitably mingled with; Meet Ca/S=1.0 ~ 3.0, welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.23% simultaneously;-20 DEG C of KV
2>=300J ,-15 DEG C of DWTT SA>=85%; Metallographic structure is: ferrite bainite+a small amount of granular bainite.
Produce the method for the high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm, its step:
1) through smelting and being cast into after base, to strand homogeneous heating to 1100～1180 DEG C;
2) carry out roughing, and control roughing end temp at 1000～1050 DEG C, single pass draft is not less than 12%, and roughing accumulative total draft is not less than 70%;
3) carry out finish rolling, and control finish rolling temperature at 930～980 DEG C, accumulative total draft is not less than 60%; When rolling temperature is below 900 DEG C when the rolling of cold zone, its accumulative total draft is not less than 40%; Finishing temperature is at 790～850 DEG C;
4) carrying out water cooling, is under 10～20 DEG C/s, to be cooled to 200 ~ 400 DEG C in rate of cooling;
5) batch, control coiling temperature at 200 ~ 400 DEG C;
6) air cooling is to room temperature.
What in the present invention, the effect of each element and master operation and value limited the reasons are as follows:
Carbon (C) content is 0.020～0.055%, add a certain amount of carbon, can significantly improve the intensity of steel, but to the thick specification pipe line steel of spy, for reducing as far as possible the Central Carbon Segregation producing in casting blank solidification process, improve steel billet cleanliness factor, adopt ultralow-carbon Composition Design, carbon content is defined as to 0.020～0.055%.As its content declines to a great extent lower than the yield strength of 0.02% coiled sheet, need a large amount of alloys such as Mo, Ni, Nb that add to make up, as carbon content easily causes the carbon enrichment of strand heart portion higher than 0.055%, cause low temperature drop weight tearing toughness to be difficult to reach technical qualification requirement.
Silicon (Si) content is 0.15～0.35%, mainly plays solution strengthening effect, avoids causing the moulding of steel, toughness significantly to worsen because adding excess silicon simultaneously.
Manganese (Mn) content is 1.85～2.00%, adds higher economic alloy element manganese, can significantly improve the intensity of steel, in addition, manganese is crystal grain thinning to a certain extent, improves the impelling strength of steel, but excessive manganese easily forms segregation, cause composition and the tissue odds of steel.
Niobium (Nb) content is 0.070～0.095%, niobium can significantly improve the austenite recrystallization temperature of steel, expand non-recrystallization district scope, be convenient to realize high temperature controlled rolling, reduce mill load, niobium can also suppress Austenite Grain Growth simultaneously, has significant refined crystalline strengthening and precipitation strength effect, therefore adopts the Composition Design of high niobium.
Vanadium (V) content is 0.015 ~ 0.040%, add appropriate vanadium and can strengthen the precipitation strength effect of Nb, in the situation that not affecting coiled sheet low-temperature flexibility, significantly improve the intensity of steel, but content of vanadium adds very few (lower than 0.01%), strengthening effect is not obvious, easily causes that higher than 0.04% low-temperature impact toughness obviously declines.
Titanium (Ti) content is 0.010～0.025%, the effect in steel of titanium and niobium is similar, there are stronger refined crystalline strengthening and precipitation strength effect, the titanium of trace can also be at high temperature combined with carbon, oxygen, form the precipitate of high temperature infusibility, be conducive to suppress the Austenite Grain Growth of welded heat affecting zone, significantly improve the toughness of welded heat affecting zone.
Molybdenum (Mo) content is 0.20～0.40%, molybdenum is significantly postponed γ → α and is changed, suppress ferrite and pearlite forming core, promote the formation of the bainite/acicular ferrite with high density dislocation substructure, make steel within the scope of a wider cooling rate, obtain bainite/acicular ferrite structure after rolling.For ensureing tissue, the performance uniformity of special thick specification pipe line steel thickness direction, Mo content is controlled to higher level.
Nickel (Ni) content is 0.15～0.40%, and nickel can effectively improve the hardening capacity of steel, has certain solution strengthening effect, can also significantly improve the low-temperature flexibility of steel.In addition, the check crack that nickel can also effectively stop the red brittleness of Cu to cause, and significantly improve the corrosion resistance nature of steel.But nickel and molybdenum are similar, belong to noble metal, easily cause the manufacturing cost of steel significantly to improve, in addition, too high nickel content easily causes steel-plate iron oxide scale to be difficult to remove, and causes plate surface quality problem.
The content of chromium (Cr) is 0.20～0.40%, chromium can effectively improve the hardening capacity of steel, and there is stronger solution strengthening effect, and cheap, can effectively substitute the precious alloy elements such as Mo, Ni, reduce production costs, in addition, add certain chromium can also improve weather-proof, the corrosion resistance nature of steel.But excessive Cr has significant deleterious effects to the fracture toughness property of the thick specification pipe line steel of spy, therefore, Cr content is controlled to reasonable level.
The content of copper (Cu) is 0.15～0.30%, adds in right amount copper, improves intensity and the hardening capacity of steel, and can improve weather-proof, the corrosion resistance nature of steel.But copper is low melting point metal, easily cause hot-shortly, add the excessive low-temperature flexibility to steel unfavorable.
The content of aluminium (Al) is 0.015～0.045%, and aluminium is deoxidant element main in steel, can significantly reduce the oxygen level in steel, and the combination of aluminium and nitrogen simultaneously forms AlN, effectively crystal grain thinning.But in steel, aluminium content exceedes when a certain amount of, easily causes the oxide inclusion of aluminium obviously to increase, reduce the cleanliness factor of steel, unfavorable to the low-temperature flexibility of steel.
The content of calcium (Ca) is 0.0010～0.0040%, in secondary refining process, steel is carried out to calcium processing, can improve the inclusion morphology in steel, significantly improves the transverse impact toughness of steel.
Phosphorus (P), sulphur (S), nitrogen (N) content are respectively: [%P]≤0.012, [%S]≤0.0015, [%N]≤0.008.Phosphorus easily causes the cold short of steel, and sulphur easily causes hot-short, and nitrogen easily causes that the quenching inefficacy of steel and deformation lost efficacy, and causes the unstable properties of steel, therefore should reduce the content of phosphorus in steel, sulphur, nitrogen as far as possible.
Ca/S=1.5 ~ 3.0, strictly control the calcium sulfur ratio in steel, are conducive to steel inclusion to carry out denaturing treatment, improve the anisotropic of steel, prevent that Ca content from adding the too high inclusion content that causes to raise simultaneously.
Welding cold crack sensitivity FACTOR P cm≤0.23%, to ensure that steel has good welding property.
Compared with prior art, the steel plate thickness of not only producing is greater than 18.4mm in the present invention, and the tissue of thickness direction, performance are even, and the mechanical property of steel plate is: yield strength (R
t0.5)>=570MPa, tensile strength (R
m)>=625MPa, yield tensile ratio (R
t0.5/ R
m)≤0.90, unit elongation (A
50mm)>=40% ,-20 DEG C of KV
2>=300J ,-15 DEG C of DWTT SA>=85%.Can meet long distance pipeline trunk main completely builds required in one, two class areas.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
1) through smelting and being cast into after base, to strand homogeneous heating to 1100～1180 DEG C;
2) carry out roughing, and control roughing end temp at 1000～1050 DEG C, single pass draft is not less than 12%, and roughing accumulative total draft is not less than 70%;
3) carry out finish rolling, and control finish rolling temperature at 930～980 DEG C, accumulative total draft is not less than 60%; When rolling temperature is below 900 DEG C when the rolling of cold zone, its accumulative total draft is not less than 40%; Finishing temperature is at 790～850 DEG C;
4) carrying out water cooling, is under 10～20 DEG C/s, to be cooled to 200 ~ 400 DEG C in rate of cooling;
5) batch, control coiling temperature at 200 ~ 400 DEG C;
6) air cooling is to room temperature.
The chemical composition of table 1 various embodiments of the present invention and comparative example and weight percentage
The main technologic parameters of table 2 various embodiments of the present invention and comparative example
The mechanics of table 3 various embodiments of the present invention and comparative example and weather resistance detected result
Can find out by table 3 data: the present invention is by the combination control of composition and technique, can realize the above X80 level of thickness 18.5mm pipe line steel coiled sheet high-strength, mould, toughness coupling, and comparative example is due to the difference of composition or cooling controlling and rolling controlling process, intensity, toughness are difficult to reach the technical requirements of the above X80 level of 18.5mm pipe line steel.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1. the high tenacity X80 pipe line steel coiled sheet of thickness>=18.5mm, its chemical composition and weight percent are: C:0.025～0.055, Si:0.10～0.35, Mn:1.85～2.00, P :≤0.012, S≤0.0015, Cu:0.15～0.30, Cr:0.20～0.40, Ni:0.15～0.40, Mo:0.20～0.40, Nb:0.070～0.095, V:0.015 ~ 0.040, Ti:0.005～0.025, Al:0.015～0.045, N :≤0.008, Ca:0.0010～0.0040, and surplus is Fe and is inevitably mingled with; Meet Ca/S=1.0 ~ 3.0, welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.23% simultaneously;-20 DEG C of KV
2>=300J ,-15 DEG C of DWTT SA>=85%; Metallographic structure is: ferrite bainite+a small amount of granular bainite.
2. the method for the high tenacity X80 pipe line steel coiled sheet of the thickness >=18.5mm described in production claim 1, its step:
1) through smelting and being cast into after base, to strand homogeneous heating to 1100～1180 DEG C;
2) carry out roughing, and control roughing end temp at 1000～1050 DEG C, single pass draft is not less than 12%, and roughing accumulative total draft is not less than 70%;
3) carry out finish rolling, and control finish rolling temperature at 930～980 DEG C, accumulative total draft is not less than 60%; When rolling temperature is below 900 DEG C when the rolling of cold zone, its accumulative total draft is not less than 40%; Finishing temperature is at 790～850 DEG C;
4) carrying out water cooling, is under 10～20 DEG C/s, to be cooled to 200 ~ 400 DEG C in rate of cooling;
5) batch, control coiling temperature at 200 ~ 400 DEG C;
6) air cooling is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410233726.XA CN104073744B (en) | 2014-05-30 | 2014-05-30 | The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410233726.XA CN104073744B (en) | 2014-05-30 | 2014-05-30 | The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104073744A true CN104073744A (en) | 2014-10-01 |
| CN104073744B CN104073744B (en) | 2016-08-10 |
Family
ID=51595340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410233726.XA Active CN104073744B (en) | 2014-05-30 | 2014-05-30 | The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104073744B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106811700A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | Thick acid-resistant X60MS hot-rolled coil and manufacturing method thereof |
| CN107406951A (en) * | 2015-03-31 | 2017-11-28 | 杰富意钢铁株式会社 | High intensity/ductility steel plate and its manufacture method |
| WO2018176788A1 (en) * | 2017-04-01 | 2018-10-04 | 江阴兴澄特种钢铁有限公司 | Pipeline steel plate for hic-resistant x80 elbow pipe and manufacturing method therefor |
| CN113617836A (en) * | 2021-06-21 | 2021-11-09 | 日照钢铁控股集团有限公司 | Rolling process for producing low-energy-consumption headless ferrite strip steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225047A (en) * | 2013-05-10 | 2013-07-31 | 武汉钢铁(集团)公司 | X80 pipeline steel having thickness of 26.5mm or more, and production method thereof |
| CN103602913A (en) * | 2013-12-10 | 2014-02-26 | 武汉钢铁(集团)公司 | X80 steel hot-rolled plate coil for natural gas pipelines and preparation method thereof |
-
2014
- 2014-05-30 CN CN201410233726.XA patent/CN104073744B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225047A (en) * | 2013-05-10 | 2013-07-31 | 武汉钢铁(集团)公司 | X80 pipeline steel having thickness of 26.5mm or more, and production method thereof |
| CN103602913A (en) * | 2013-12-10 | 2014-02-26 | 武汉钢铁(集团)公司 | X80 steel hot-rolled plate coil for natural gas pipelines and preparation method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107406951A (en) * | 2015-03-31 | 2017-11-28 | 杰富意钢铁株式会社 | High intensity/ductility steel plate and its manufacture method |
| CN107406951B (en) * | 2015-03-31 | 2019-09-24 | 杰富意钢铁株式会社 | High-intensitive and ductility steel plate and its manufacturing method |
| US10544478B2 (en) | 2015-03-31 | 2020-01-28 | Jfe Steel Corporation | High-strength, high-toughness steel plate, and method for producing the same |
| CN106811700A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | Thick acid-resistant X60MS hot-rolled coil and manufacturing method thereof |
| CN106811700B (en) * | 2015-12-02 | 2018-04-24 | 鞍钢股份有限公司 | Thick acid-resistant X60MS hot-rolled coil and manufacturing method thereof |
| WO2018176788A1 (en) * | 2017-04-01 | 2018-10-04 | 江阴兴澄特种钢铁有限公司 | Pipeline steel plate for hic-resistant x80 elbow pipe and manufacturing method therefor |
| CN113617836A (en) * | 2021-06-21 | 2021-11-09 | 日照钢铁控股集团有限公司 | Rolling process for producing low-energy-consumption headless ferrite strip steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104073744B (en) | 2016-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103225047B (en) | The X80 pipeline steel of thickness >=26.5mm and production method thereof | |
| CN101613828B (en) | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacturing method | |
| CN103834874B (en) | Heavy wall height DWTT performance X65-70 subsea pipeline steel and manufacture method | |
| CN105803327B (en) | The X90 Pipeline Steel Plates and its manufacture method of a kind of economical hic resistance | |
| CN103866204B (en) | The large sstrain X80 dual phase sheet steel that the large soft reduction process of a kind of low temperature is produced | |
| CN103276314B (en) | X80 pipeline steel plate with low yield ratio and high toughness and manufacturing method thereof | |
| CN108467993A (en) | Ultra-wide high-toughness hot-rolled thick plate for low-temperature pipeline and production method thereof | |
| CN101619416A (en) | High-strength X100 pipeline steel hot-rolled flat plate and production method thereof | |
| CN104805375A (en) | Steel plate for super-thick high-tenacity X80 pipeline and manufacturing method of steel plate | |
| CN103510003B (en) | A kind of large diameter pipeline Chinese People's Anti-Japanese Military and Political College is out of shape heterogeneous X100 High Strength Steel Plate and manufacture method thereof | |
| CN103243278B (en) | X90 pipeline steel and production method thereof | |
| CN102400054A (en) | X80 pipeline steel for straight-seam electric resistance welding pipe and method for manufacturing hot-rolled coil thereof | |
| CN109957714B (en) | Steel for pipeline excellent in strength and low-temperature toughness and method for producing same | |
| US20150361518A1 (en) | 500 MPa GRADE LONGITUDINALLY WELDED STEEL PIPE WITH LOW YIELD RATIO AND MANUFACTURING METHOD THEREFOR | |
| CN103805865B (en) | A kind of economical X 70 petroleum natural gas pipeline steel and production method thereof | |
| CN1318631C (en) | Method for producing high strength high toughness X80 pipeline steel and its hot-rolled plate | |
| CN103276315B (en) | 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof | |
| CN103160746A (en) | Steel for high-strength thick-wall water delivery pipe and manufacturing method thereof | |
| CN104846293A (en) | High-strength high-toughness steel plate and preparation method thereof | |
| CN111996461A (en) | X70 pipeline coiled plate for microalloyed resistance welded pipe and production method thereof | |
| CN103422022B (en) | Large-thickness steel plate for low-temperature structure and production method thereof | |
| CN109207854A (en) | Super-wide-specification high-strength high-toughness steel for ocean engineering and manufacturing method thereof | |
| CN105886912B (en) | A kind of low compression ratio think gauge X70 levels steel for gas delivering pipeline and production method | |
| CN104532155A (en) | X90 level heterogeneous structure pipeline steel plate for longitudinal welded pipe and manufacturing method of pipeline steel plate | |
| CN106636943A (en) | Thin-specification high-strength pipeline steel with ductility A 50.8 of not less than 48% 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 | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170714 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |