CN101270440A - Economy type X70 pipeline steel and producing method thereof - Google Patents

Economy type X70 pipeline steel and producing method thereof Download PDF

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Publication number
CN101270440A
CN101270440A CNA2007100383973A CN200710038397A CN101270440A CN 101270440 A CN101270440 A CN 101270440A CN A2007100383973 A CNA2007100383973 A CN A2007100383973A CN 200710038397 A CN200710038397 A CN 200710038397A CN 101270440 A CN101270440 A CN 101270440A
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equal
steel
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pipeline steel
pipe line
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高珊
郑磊
章传国
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

An economical type X70 pipeline steel of the invention mainly contains the following components in weight percent: 0.015 to 0.060 of Carbon, smaller than or equal to 0.30 of Silicon, 0.7 to 1.80 of Manganese, less than or equal to 0.015 of Phosphorous, less than or equal to 0.050 of Sulfur, 0.01 to 0.05 of Aluminum, 0.001 to 0.004 of Calcium, less than or equal to 0.006 of Nitrogen, greater than or equal to 0.04 and less than or equal to 0.15 of Niobium, greater than or equal to 0.005 and less than or equal to 0.020 of Titanium, and the remaining components are Ferrum and other inevitable purities element. Less than or equal to 0.08 of Vanadium, less than or equal to 0.50 of Chromium, less than or equal to 0.50 of Molybdenum, less than or equal to 0.60 of Copper, less than or equal to 0.60 of Nickel which are in weight percentage can be added into the steel. The economical type X70 pipeline steel of the invention has the advantages of the low production cost, the excellent comprehensive mechanical performance and the good welding performance, the simple production process, the short fabrication period, promoting the labor efficiency and the rolling yield, and being applied in various metallurgy enterprises.

Description

A kind of economical X 70 pipeline steel and production method thereof
Technical field
The invention belongs to low alloy steel and make the field, be specifically related to X70 pipe line steel and production method thereof.
Background technology
The above pipe line steel of X70 level is controlled rolling and quickens the refrigerative low-carbon micro steel-alloy, is the leading steel of gas transmission in this century Trunk Line, has excellent anti-ductile fracture performance.Global Manufactured X70 gas pipe line mainly concentrates on Germany and Canada at present.China " is still generally using the X70 pipe line steel at present on the West-east Gas; And that X70 compares X70 intensity is bigger, so the X70 steel has considerable market outlook.
Existing a plurality of patents of invention before the present invention about the X70 pipe line steel, with the keyword is the relevant patent documentation that X70pipeline or linepipe plate retrieval obtains, with more approaching the having of the present invention: (1) CN1403616 (applying date 20030319), denomination of invention is " low-carbon low-alloy steel and a pipe ", relates to making X60~other pipe line steel of X70 level; (2) the open communique JP11080833 of Japanese application for a patent for invention, denomination of invention is " the high-strength line-pipe tube steel panel products with good anti-HIC performance ", relates to the pipe line steel with good anti-HIC performance that is used to make X70~X70 grade of steel; (3) the open 2003055536 A applyings date 20030704 of communique KR of Korea S's application for a patent for invention) 200378B, denomination of invention for " be used to make the method for pipe line steel; comprise the slab heating of certain ingredients; roughing and dynamic recrystallization, finish rolling take place in its process and batch ", relate to the method that is used to make pipe line steel, comprise composition and technology; (4) open communique CN 1746326 A (applying date 20060315) 200647 B of Chinese invention patent application, denomination of invention is " acicular ferrite X70 pipe line steel and a manufacture method thereof with high crack arrest characteristic ", relates to the manufacture method that is used to make the acicular ferrite X70 pipe line steel with high crack arrest characteristic; (5) international publication number WO 2006086853 A1 (20060824) 200658 B, denomination of invention is the manufacturing that the patent application of " pipe line steel comprises C, Mn, Ti, Si, Nb, Al, Ca, S, P, Cr, Mo, B, Ni, Cu, V " relates to X60~X70 steel level pipeline pipeline steel, comprises various compositions designs; (6) open communique JP 57126959 A (19820806) 198237 B " high-intensity high-tenacity has pipe line steel-C, Mn, Cu, Ni, Cr, Al, Ca, Nb, V, the Ti etc. of good crack arrest characteristic " of Japanese application for a patent for invention relate to the manufacturing of high-strength line-pipe steel, comprise its composition design; (7) open communique KR 2003053754 A (applying date 20030702) 200375 B of Korea S's application for a patent for invention, denomination of invention is the manufacturing that " manufacture method of high-strength line-pipe steel; comprise slab heating, hot rolling and batch " relates to the high-strength line-pipe steel with anti-HIC premium properties, comprises the design of composition, technology.
Though disclosed steel of above patent documentation and steel pipe have reached high strength, what have has a good anti-HIC performance,, their production cost is than higher.
Therefore, first purpose of the present invention provides a kind of economical X 70 pipeline steel.
Second purpose of the present invention provides the production method of this economical X 70 pipeline steel.
Summary of the invention
Economical X 70 pipeline steel provided by the invention mainly is grouped into by following one-tenth: C:0.015-0.060, Si≤0.30, Mn:0.7~1.80, P≤0.015, S≤0.050, Al:0.01-0.05, Ca:0.001-0.004, N :≤0.006,0.04≤Nb≤0.15,0.005≤Ti≤0.020 is weight %, surplus is Fe and unavoidable impurities element.
Can also add V≤0.08 in the economical X 70 pipeline steel provided by the invention, Cr≤0.50, Mo≤0.50, Cu≤0.60, Ni≤0.60 is weight %.
The production method of economical X 70 pipeline steel provided by the invention comprises molten iron pre-desulfurization, smelting, continuous casting, slab finishing, hot rolling and coiling process, it is characterized in that: adopt controlled rolling and controlled cooling in the hot-rolled process, the hot rolling Heating temperature is 1100~1170 ℃, the recrystallization zone rolling temperature is 1150~950 ℃, and non-recrystallization zone rolling temperature is 930 ℃~750 ℃; Stopping cooling temperature (coiling temperature) is 450~650 ℃, and speed of cooling is 5~30 ℃/s.
The qualification of the Chemical Composition of X70 rank Extra High Strength pipe line steel of the present invention be the reasons are as follows:
High-intensity high-tenacity X70 pipe line steel composition design philosophy is with low C, high Mn, by add microalloy elements such as micro-Nb, V, Ti, in conjunction with the hot rolling cooling controlling and rolling controlling process, obtain acicular ferrite structure, have the performance of high-intensity high-tenacity to guarantee pipe line steel.Its main fundamental element effect has the following aspects:
Carbon: be strengthening element most economical, the most basic in the steel, by solution strengthening and precipitation strength the intensity that improves steel there is obvious effect, but improve C content ductility, toughness and the weldability of steel had negative impact, thus modern age pipe line steel evolution be the process (as shown in Figure 1) that constantly reduces C content.Reduce the toughness that C content helps to improve steel on the one hand, can improve the welding property of steel on the other hand.From Fig. 1 as seen, pipe line steel can have good weldability when C content is lower than 0.11%.So the C content of current pipeline steel is generally less than 0.11%, to need more the pipe line steel of high tenacity then adopt C less than 0.06% ultralow C content design.
Manganese:, be that compensation reduces the main and most economical strengthening element that causes loss of strength in the pipe line steel because of C content by the intensity of solution strengthening raising steel.Mn still enlarges the element of γ phase region, can reduce the γ → α transformation temperature of steel, helps to obtain tiny phase-change product, can improve toughness, the reduction ductile-brittle transition temperature of steel.Therefore the Mn content to the X80 pipe line steel designs in 0.7~1.80% scope.
Niobium: be one of topmost element in the modern microalloying pipe line steel, fairly obvious to the effect of grain refining.Separate out the austenitic answer of obstruction deformation, recrystallize by NbC strain inducing in the course of hot rolling, when making the rolling deformation austenite structure in non-recrystallization zone of finish rolling stage in phase transformation, controlled rolling and controlled chilling change tiny phase-change product into, so that steel has high strength and high tenacity.This patent is exactly to cooperate suitable C content to improve the effect of the content performance NbC of Nb.
Titanium: be strong solid N element, the stoichiometric ratio of Ti/N is 3.42, utilizes the Ti fixing following N of 60ppm in the steel just about 0.02%, can form the TiN precipitated phase of tiny high-temperature stable when sheet billet continuous casting.Austenite crystal when this tiny TiN particle can hinder the slab reheat is effectively grown up, and helps to improve the solid solubility of Nb in austenite, simultaneously the impelling strength of improving welded heat affecting zone is had obvious effect.
Sulphur, phosphorus: be unavoidable impurities element in the steel, it is low more good more to wish.By super low sulfur (less than 30ppm) and Ca processing sulfide is carried out inclusion morphology control, can make pipe line steel have high impelling strength.
Cr/Mo: can effectively improve hardening capacity, suppress polygonal ferrite and pearlitic generation, promote in middle gentle cold zone, to form ferrite or the bainite that intracrystalline has a large amount of dislocations to distribute.
Al is the element that adds for deoxidation in the steel, adds an amount of Al and helps crystal grain thinning, improves the toughness and tenacity of steel;
Handle the form that to control sulfide by Ca, improve the anisotropy of steel plate, improve low-temperature flexibility, its content is less than at 0.001 o'clock does not have effect, surpasses 0.006 and then can produce many CaO, CaS, and form large-scale inclusion, toughness to steel causes damage, even influences the welding property of steel.So regulation Ca content range is 0.001%-0.004%.
Therefore, have high-intensity high-tenacity and good welds performance at micro-alloying low-carbon acicular ferrite structure, and low characteristics such as Bauschinger effect, based on material reinforcement theories such as grain refining, phase transformation strengthening, precipitation strength and dislocations strengthenings, use for reference long-term pipe line steel knowhow of the applicant and pipe line steel laboratory study result, the composition design with acicular ferrite X70 pipe line steel has been adopted the composition design of lower carbon content, super low sulfur, Nb, Ti microalloying with low-carbon (LC) acicular ferrite structure feature.Process for making adopts the smelting Technology for Clean Steel of inclusion morphology control, hot rolling technology has adopted the hot mechanical treatment technology of controlled rolling and controlled cooling, carry out the organizational controls of the finished product by reasonable component and technology, to obtain to have the low-carbon (LC) acicular ferrite structure of high-intensity high-tenacity.
Table 1 has shown different on chemical ingredients of the steel addressed in steel of the present invention and the document.
Figure A20071003839700061
Analyze the difference of above-mentioned patent and this patent: compare with patent 1, the composition of this patent is simple relatively, mainly based on C, Mn, Nb, Ti alloy, Cr, Mo, Cu, Ni, V can selectivity add the composition design that also can not add, do not add the B alloying element, simplify steel making working procedure and reduce cost; Compare with patent 2, be used to produce X60~X80 pipe line steel, on impurity contents such as P, S, require relatively strictness,, increase steel-making cost so to the steel-making requirements strictness.Secondly, they require on carbon equivalent Ceq more than or equal to 0.32, for satisfying such carbon equivalent, the content of alloying elements such as necessary increase Mn, also just increased manufacturing cost, the increase of carbon equivalent simultaneously must cause the decline of welding property. and this patent also can be produced the pipe line steel of X70 intensity rank under less than 0.32 situation at Ceq; Compare with patent 3, patent 3 reaches high intensity by adding V element, and this patent can not add V element, and secondly, patent 3 is different with the mentality of designing of this patent, this patent is by the cooperation of low C, high Nb, relation between C and the Nb adopts Ultra-low carbon to cooperate high Nb content, has not only improved clean temperature again, enhance productivity, and played the effect of precipitation strength; Compare with patent 4, patent 4 must be added the Mo elements, and the mentality of designing of Nb, the C relation of utilizing with this patent is different; Compare with patent 5, the C content of patent 5 belongs to high C, and is different with the mentality of designing of this patent; Compare with patent 6, the C content range of patent 6 is less, needs to add more Mn, increased manufacturing cost, and it requires the Pcm index must be greater than 0.16, for reaching such Pcm index, must add more alloying element, and cause the reduction of welding property.This patent is lower than under 0.16 situation at the Pcm index also can produce the X70 pipe line steel; Compare with patent 8, the C content of patent 8 is higher, and the Nb content of Pei Heing is smaller or equal to 0.09% with it, and is different with the mentality of designing of this patent, and it is strict to constituent contents such as P, S, has increased the production difficulty and the manufacturing cost of steel-making.
In a word, the present invention has following advantage:
1. economical X 70 pipeline steel plate of the present invention adopts the composition design of simple economy, based on C, Mn, Nb, Ti alloy, Cr, Mo, Cu, Ni, V can selectivity add the composition design that also can not add, do not add the B alloying element, just can reach the performance requriements of X70 grade of steel, on cost of alloy, reduce greatly;
2. steel grade of the present invention adopts cooling controlling and rolling controlling process production, can realize that on technology low-temperature heat, middle time of staying temperature shorten, stop the rolling temperature height, plate shape is good, and production technique is simple, and is with short production cycle, improved labor productivity and lumber recovery;
3. steel of the present invention has good comprehensive mechanical property, and intensity satisfies the requirement of API 5L to the X70 pipe line steel; Have good low-temperature impact toughness ,-30 ℃ Charpy-V impact power is greater than 200J, and SA% is greater than 85%, and has good anti-low-temperature dynamic and tear ability, and-15 ℃ DWTT SA% is greater than 75%;
4. steel of the present invention has good welding property, and it has lower Ceq and Pcm index, recommends by rational composition design and welding material, and welding property preferably can be arranged.
Because the present invention has above advantage, all can implement at various smelters.Economical X 70 pipeline steel of the present invention can be used for making heavy caliber X70 pipeline steel tube.
Description of drawings
Fig. 1 is the Graville graphic representation of C content in the steel, carbon equivalent and steel weldability relation.Among the figure, tiltedly arrow represents constantly to reduce the pipe line steel evolution of C content, and the area I weldability is good, and area I I can weld carefully, and area I II is difficult to welding.
Specific implementation method
Below for a more detailed description with embodiment to the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1-7
According to chemical ingredients shown in the table 2 smelt, continuous casting, slab finishing and hot rolling, the hot rolling Heating temperature is 1100~1130 ℃, the recrystallization zone rolling temperature is 1100~930 ℃, non-recrystallization zone rolling temperature is 930 ℃~750 ℃; Stopping cooling temperature is 500~650 ℃, and speed of cooling is 5~30 ℃/s.
Embodiment 7
By the mechanical property that each embodiment steel is tested in standard method, the result is as shown in table 3.
The Mechanics Performance Testing result of each embodiment steel of table 3
Figure A20071003839700101
As seen, compare with patent documentation in the past, X70 pipe line steel composition of the present invention is simple. and especially the carbon equivalent among the embodiment does not all have to surpass 0.32, but obtained the intensity of X70 grade of steel, guarantee that simultaneously steel has good welding property, for the welding of tubulation moulding process and site operation welding provide good condition.The X70 pipe line steel that the present invention produces all has excellent mechanical property, can be used for making heavy caliber X70 pipeline steel tube.

Claims (3)

1. an economical X 70 pipeline steel mainly is grouped into by following one-tenth: C:0.015-0.060, Si≤0.30, Mn:0.7~1.80, P≤0.015, S≤0.050, Al:0.01-0.05, Ca:0.001-0.004, N :≤0.006,0.04≤Nb≤0.15,0.005≤Ti≤0.020, be weight %, surplus is Fe and unavoidable impurities element.
2. economical X 70 pipeline steel as claimed in claim 1 wherein adds V≤0.08, Cr≤0.50, and Mo≤0.50, Cu≤0.60, Ni≤0.60 is weight %.
3. the production method of the described economical X 70 pipeline steel of claim 1, comprise molten iron pre-desulfurization, smelting, continuous casting, slab finishing, hot rolling and coiling process, it is characterized in that: adopt controlled rolling and controlled cooling in the hot-rolled process, the hot rolling Heating temperature is 1100~1170 ℃, the recrystallization zone rolling temperature is 1150~950 ℃, and non-recrystallization zone rolling temperature is 930 ℃~750 ℃; Stopping cooling temperature is 450~650 ℃, and speed of cooling is 5~30 ℃/s.
CNA2007100383973A 2007-03-23 2007-03-23 Economy type X70 pipeline steel and producing method thereof Pending CN101270440A (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
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CN101701315B (en) * 2009-10-30 2011-06-08 中海石油金洲管道有限公司 Manufacturing method of submerged pipeline steel pipe
CN102181796A (en) * 2011-03-31 2011-09-14 首钢总公司 Production method of X70 hot-rolled medium plate for submerged pipeline
CN102234742A (en) * 2010-04-23 2011-11-09 宝山钢铁股份有限公司 Steel plate for longitudinal welded pipe and manufacturing method thereof
CN102373383A (en) * 2011-10-30 2012-03-14 山西太钢不锈钢股份有限公司 X70 pipeline steel hot rolled coil and manufacture method thereof
CN101684539B (en) * 2008-09-27 2012-04-04 鞍钢股份有限公司 Thick-specification high-tenacity X70 acicular ferrite pipe line steel and manufacturing method thereof
CN102409231A (en) * 2010-09-21 2012-04-11 鞍钢股份有限公司 Hot-rolled flat plate for X70 cold-stewed bent pipe and production method for hot-rolled flat plate
CN102586673A (en) * 2011-01-13 2012-07-18 宝钢集团新疆八一钢铁有限公司 Method for improving DWTT (drop weight tear test) index of X70 pipeline steel
CN103233185A (en) * 2013-05-10 2013-08-07 武汉钢铁(集团)公司 Steel for X100 pipeline and production method thereof
CN103468905A (en) * 2013-09-06 2013-12-25 鞍钢股份有限公司 485MPa grade pipeline steel hot-rolled coil plate and manufacturing method thereof
CN103805865A (en) * 2014-03-14 2014-05-21 武汉钢铁(集团)公司 Economical X70 petroleum and gas pipeline steel and production method thereof
CN103981463A (en) * 2014-05-30 2014-08-13 秦皇岛首秦金属材料有限公司 X70 bend hot-rolled flat plate having excellent toughness and production method thereof
CN108265225A (en) * 2018-03-21 2018-07-10 包头钢铁(集团)有限责任公司 A kind of acid-resisting corrosion X65MS pipe line steels and preparation method thereof
CN108796362A (en) * 2017-04-26 2018-11-13 宝山钢铁股份有限公司 X70 pipe line steels and its manufacturing method with the anti-dynamic tear performance of superior low temperature
CN109023069A (en) * 2018-09-04 2018-12-18 鞍钢股份有限公司 The effective steel plate of NbC reinforced by nanoparticles X80 plasticity and its manufacturing method
CN110964971A (en) * 2019-12-25 2020-04-07 山东钢铁集团日照有限公司 Production method of X65M-grade pipeline steel plate with thin specification and high crack resistance
CN112553524A (en) * 2019-09-26 2021-03-26 上海梅山钢铁股份有限公司 Hot rolled steel plate with yield strength of 360MPa for pipeline and manufacturing method thereof
CN112680659A (en) * 2020-12-04 2021-04-20 安阳钢铁股份有限公司 Low-compression-ratio economical X70 pipeline steel and production method thereof
CN115354210A (en) * 2022-08-03 2022-11-18 新疆八一钢铁股份有限公司 Method for preparing high-strength high-toughness pipeline steel

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101684539B (en) * 2008-09-27 2012-04-04 鞍钢股份有限公司 Thick-specification high-tenacity X70 acicular ferrite pipe line steel and manufacturing method thereof
CN101701315B (en) * 2009-10-30 2011-06-08 中海石油金洲管道有限公司 Manufacturing method of submerged pipeline steel pipe
CN102234742B (en) * 2010-04-23 2015-12-02 宝山钢铁股份有限公司 A kind of steel plate for longitudinal welded pipe and manufacture method thereof
CN102234742A (en) * 2010-04-23 2011-11-09 宝山钢铁股份有限公司 Steel plate for longitudinal welded pipe and manufacturing method thereof
CN102409231A (en) * 2010-09-21 2012-04-11 鞍钢股份有限公司 Hot-rolled flat plate for X70 cold-stewed bent pipe and production method for hot-rolled flat plate
CN102586673A (en) * 2011-01-13 2012-07-18 宝钢集团新疆八一钢铁有限公司 Method for improving DWTT (drop weight tear test) index of X70 pipeline steel
CN102181796A (en) * 2011-03-31 2011-09-14 首钢总公司 Production method of X70 hot-rolled medium plate for submerged pipeline
CN102181796B (en) * 2011-03-31 2012-11-21 首钢总公司 Production method of X70 hot-rolled medium plate for submerged pipeline
CN102373383A (en) * 2011-10-30 2012-03-14 山西太钢不锈钢股份有限公司 X70 pipeline steel hot rolled coil and manufacture method thereof
CN103233185A (en) * 2013-05-10 2013-08-07 武汉钢铁(集团)公司 Steel for X100 pipeline and production method thereof
CN103468905A (en) * 2013-09-06 2013-12-25 鞍钢股份有限公司 485MPa grade pipeline steel hot-rolled coil plate and manufacturing method thereof
CN103468905B (en) * 2013-09-06 2016-03-02 鞍钢股份有限公司 A kind of 485MPa level line steel hot rolling roll bending and manufacture method thereof
CN103805865A (en) * 2014-03-14 2014-05-21 武汉钢铁(集团)公司 Economical X70 petroleum and gas pipeline steel and production method thereof
CN103805865B (en) * 2014-03-14 2016-04-27 武汉钢铁(集团)公司 A kind of economical X 70 petroleum natural gas pipeline steel and production method thereof
CN103981463A (en) * 2014-05-30 2014-08-13 秦皇岛首秦金属材料有限公司 X70 bend hot-rolled flat plate having excellent toughness and production method thereof
CN108796362A (en) * 2017-04-26 2018-11-13 宝山钢铁股份有限公司 X70 pipe line steels and its manufacturing method with the anti-dynamic tear performance of superior low temperature
CN108265225A (en) * 2018-03-21 2018-07-10 包头钢铁(集团)有限责任公司 A kind of acid-resisting corrosion X65MS pipe line steels and preparation method thereof
CN109023069A (en) * 2018-09-04 2018-12-18 鞍钢股份有限公司 The effective steel plate of NbC reinforced by nanoparticles X80 plasticity and its manufacturing method
CN112553524A (en) * 2019-09-26 2021-03-26 上海梅山钢铁股份有限公司 Hot rolled steel plate with yield strength of 360MPa for pipeline and manufacturing method thereof
CN110964971A (en) * 2019-12-25 2020-04-07 山东钢铁集团日照有限公司 Production method of X65M-grade pipeline steel plate with thin specification and high crack resistance
CN112680659A (en) * 2020-12-04 2021-04-20 安阳钢铁股份有限公司 Low-compression-ratio economical X70 pipeline steel and production method thereof
CN115354210A (en) * 2022-08-03 2022-11-18 新疆八一钢铁股份有限公司 Method for preparing high-strength high-toughness pipeline steel

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