CN102851587A - Anti-deformation X80-X100 pipeline steel plate and manufacturing method thereof - Google Patents
Anti-deformation X80-X100 pipeline steel plate and manufacturing method thereof Download PDFInfo
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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 engineering projects such as oil and gas pipelines 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 will through a large amount of geologic condition unstable regions, such as seismic zone, rubble flow, tundra etc., have a strong impact on the safety of pipeline.Be built in oil pipeline in 1973 such as China Golmud-Lhasa oil pipeline and be built in 1973, be article one permafrost region oil pipeline that China builds, total length 1076km moves over more than 30 year owing to reasons such as thaw settlements, this pipeline once occured 30 times and leaked, and had caused very large financial loss.For this reason, at the geologic condition unstable region, " based on stress design " theory has been adopted in pipework, requires pipe line steel not only to possess good low-temperature toughness, also have 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 makes on its pipework project that can not be applied to stress design because of its higher yield tensile ratio and the low factors such as uniform elongation.
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 to produce good-toughness is the technical barrier that those skilled in the art thirst for solving always.
Summary of the invention
One of purpose 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 that counts 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, and the increase of carbon content has obvious effect to the intensity that improves steel.But the increase meeting of carbon content has negative impact to ductility, toughness and the welding property of steel.So the carbon content that the present invention selects is 0.04-0.09%, mainly be to consider low carbon meeting so that the yield tensile ratio of steel plate increases on the one hand, mainly be to consider the toughness of steel plate and good welding property on the other hand.
Manganese (Mn): the solution strengthening element, the intensity that both can improve steel also can be improved the toughness of steel.Appropriateness improves the hardening capacity of steel, enlarges the γ phase region, and the γ of reduction steel → α transformation temperature helps 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 of steel employing of the present invention 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 obtain 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 so that can keep more dislocation desity in the matrix, improves intensity and the toughness of steel by the pinning dislocation.The niobium of solid solution condition can postpone γ → α to be changed, the refinement ferrite crystal grain, and the toughness of raising steel, the niobium of solid solution can continue to separate out with Nb (CN) in process of cooling, further improves the intensity of steel.Among the present invention, adopt the high niobium design of 0.05-0.11%, embodied above analysis spirit, reach the thinning microstructure that substitutes Mo, the effect of precipitation strength, reduce the cost of steel.
Titanium (Ti): titanium is strong nitrogen killer, can form the TiN particle with nitrogen, thereby can suppress the alligatoring of austenite crystal in the blank heating process, plays the effect of crystal grain thinning, improves the low-temperature flexibility of steel; Equally, the 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 the 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 generally is not less than 3.4 times of nitrogen, and the add-on of asking titanium in the invention is 0.01-0.025%.
Copper (Cu): copper can improve the intensity of steel plate and welded heat affecting zone, and 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 the resistance to atmospheric corrosion that 0.1% copper just can significantly improve steel.But excessive copper is disadvantageous to the toughness of welded heat affecting zone and welding zone, and steel of the present invention has adopted and has been not more than 0.4% add-on.
Chromium (Cr): chromium is carbide forming element equally, can improve steel plate hardness, plays the effect of precipitation strength; Chromium can obtain more acicular ferrite structure as ferrite former in high Nb steel; Chromium can also improve the anticorrosive and anti-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 among the present invention, steel of the present invention has adopted and has been not more than 0.4% add-on.
Nickel (Ni): nickel improves the intensity of steel by solution strengthening, compare with Mo, and the nickel of adding tends to form sclerosis phase still less, thereby favourable to low-temperature flexibility; Simultaneously, nickel also helps to improve and adds the red brittleness that copper causes in the steel.Steel of the present invention has adopted and has been not more than 0.5% add-on.
Another object of the present invention is to provide a kind of method for preparing aforementioned resistance to deformation X80-X100 pipe line steel, the method be on the basis of aforementioned component design (namely, 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 consists of, 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 proportioning get the raw materials ready → molten iron pre-desulfurization → converter smelting → LF refining → RH processings → sheet billet continuous casting → slab reheats → temperature controlled rolling → relaxation air cooling → pre-straightening → accelerations cooling → hot straightening → cold bed cooling → UT detects a flaw → shearing → 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+acceleration cooling to carry out the polyphase structure regulation and control, the relaxation air cooling is to transformation temperature Ar
3Below enter the pre-straightening of pre-straightening machine after 10 ℃～100 ℃, then enter fast and accelerate cooling, accelerate 10～50 ℃/s of speed of cooling, final temperature is 260 ℃～500 ℃.
Have following mechanical property by the resistance to deformation X80-X100 Pipeline Steel Plate that aforementioned component designs and preparation technology obtains:
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 ,-15 ℃ Drop-Weight Tear Test (DWTT) shear area average percent (DWTT SA%) 〉=85%;
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 ,-15 ℃ Drop-Weight Tear Test (DWTT) shear area average percent (DWTT SA%) 〉=85%.
Description of drawings
Fig. 1 is the metallographic structure photo of resistance to deformation X80 steel plate among the embodiment 1;
Fig. 2 is the metallographic structure photo of resistance to deformation X80 steel plate among the embodiment 2;
Fig. 3 is the metallographic structure photo of resistance to deformation X80 steel plate among the embodiment 3;
Fig. 4 is the metallographic structure photo of resistance to deformation X80 steel plate among the embodiment 4;
Fig. 5 is the metallographic structure photo of resistance to deformation X80 steel plate among the embodiment 5;
Fig. 6 is the metallographic structure photo of resistance to deformation X80 steel plate among the embodiment 6;
Fig. 7 is the EBSD analysis chart of resistance to deformation X80 steel among the embodiment 1;
Fig. 8 is the TEM photo of resistance to deformation X80 pipe line steel among the embodiment 1, wherein: (a) MA island light field phase between the ferritic phase, (b) details in a play not acted out on stage, but told through dialogues phase in MA island between ferritic phase, (c) MA island (d) bainite ferrite and MA film therebetween on ferrite/bainite and the interface thereof, (e) lower bainite/ferrite/bainite ferrite, (f) precipitated phase in the 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 the table 1 design carry out proportioning get the raw materials ready → molten iron pre-desulfurization → converter smelting → LF refining → RH processings → sheet billet continuous casting → slab reheats → temperature controlled rolling → relaxation air cooling → pre-straightening → accelerations cooling → hot straightening → cold bed cooling → UT detects a flaw → shearing → 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, with reference to the Mechanics Performance Testing to the related steel plate of previous embodiment 1-6 of the standard of API Spec 5L-2007, then also can obtain the test result shown in the table 3, these test results show, not only has excellent toughness by the resulting Pipeline Steel Plate of technical scheme of the present invention, 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 have very smooth hot rolled plate shape, be particularly useful for the petroleum-gas pipeline engineering project of " based on anti-stress design ".
Attached reaching, this case contriver has also carried out EBSD analysis and TEM test to the typical sample that previous embodiment 1 obtains in the resistance to deformation X80 Pipeline Steel Plate, and its result can be referring to Fig. 7-Fig. 8.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics; its purpose is to allow the personage who is familiar with technique can understand content of the present invention and according to this enforcement; can not limit protection scope of the present invention with this; all equivalences that spirit is done according to the present invention change or revise, and all should be encompassed within 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
Annotate: the mechanical property test of this resistance to deformation X80/X100 steel plate is carried out according to API Spec 5L-2007.
Claims (2)
1. a resistance to deformation X80-X100 Pipeline Steel Plate is characterized in that, it comprises the following component that counts 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.
2. the manufacture method of a resistance to deformation X80-X100 Pipeline Steel Plate comprises the slab that has with the described resistance to deformation X80-X100 of claim 1 Pipeline Steel Plate corresponding chemical composition is processed through controlled rolling, relaxation, pre-straightening and control cooling working procedure successively, it is characterized in that,
In the 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 ℃～820 ℃ of finishing temperatures;
Roll rear steel plate relaxation air cooling to transformation temperature Ar
3Below enter the pre-straightening of pre-straightening machine after 10 ℃～100 ℃, then enter fast and accelerate cooling, accelerate 10～50 ℃/s of speed of cooling, final temperature is 260 ℃～500 ℃.
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