CN103789680A - Large-strain steel tube for oil-gas pipeline - Google Patents
Large-strain steel tube for oil-gas pipeline Download PDFInfo
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- CN103789680A CN103789680A CN201210434021.5A CN201210434021A CN103789680A CN 103789680 A CN103789680 A CN 103789680A CN 201210434021 A CN201210434021 A CN 201210434021A CN 103789680 A CN103789680 A CN 103789680A
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Abstract
The invention discloses a large-strain steel tube for an oil-gas pipeline. The chemical ingredients of the steel tube comprise the following components by mass percent: 0.07-0.09% of C, 0.5-0.8% of Si, 1.30-1.50% of Mn, no more than 0.008% of P, no more than 0.003% of S, 0.6-0.8% of Cr, 0.3-0.7% of Ni, 0.1-0.2% of Nb, 0.005-0.01% of B, 0.4-0.6% of Cu, 0.020-0.050% of Al, 0.030-0.10% of N, 0.05-0.10% of V, and the balance of Fe and inevitable impurities.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, relate in particular to large strain steel pipe for a kind of oil and gas pipes.
Background technology
China's oil and gas pipes engineering development is very fast, and especially long-distance transmission pipeline construction is greatly developed in recent years, and pipeline must pass through Various Complex geology and geomorphology condition along the line.All adopt the method for design based on stress at most area pipeline, but at pipeline during through sections such as seismic zone and moving fault and intracraton basin, tundra, landslide bands, must adopt the piping design method based on strain, this just needs to adopt have the high Grade Pipeline Steel that uniform plastic deformation capacity is larger and develop corresponding manufacturing technology.Generally speaking, when pipeline steel strength is lower, uniform plastic deformation capacity is larger, and it is more difficult to obtain larger viscous deformation volume ratio for high Grade Pipeline Steel.In addition, high Grade Pipeline Steel and steel pipe are because the effect of temperature can produce intensity and hardness raises in anticorrosion process subsequently, and the phenomenon that plasticity and toughness decline, produces strain aging phenomenon.Steel pipe also can produce strain aging phenomenon in long-term use procedure.In recent years, along with the development of controlled rolling air cooling technique, the yield tensile ratio of pipe line steel rose to 0.90～0.95 from 0.80～0.85 of the past, and too high yield tensile ratio has limited the deformability of pipe line steel and steel pipe, thereby safety in utilization is exerted an influence.At present, the high Grade Pipeline Steel with high strain property develops in the world, and obtains engineering application, but can not take into account well strain aging performance.
Summary of the invention
The object of the invention is to propose large strain steel pipe for a kind of oil and gas pipes, this steel strength rank reaches X80, uniform plastic deformation unit elongation is high, strain aging sensitivity is low, is applicable to Earthquake Fault Zone, intracraton basin, tundra, landslide band etc. and uses based on strain piping design area.
For reaching this object, the present invention by the following technical solutions:
A kind of large strain steel pipe for oil and gas pipes, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.07-0.09, Si:0.5-0.8, Mn:1.30-1.50, P :≤0.008, S :≤0.003, Cr:0.6-0.8, Ni:0.3-0.7, Nb:0.1-0.2, B:0.005-0.01, Cu:0.4-0.6, Al:0.020-0.050, N:0.030-0.10, V:0.05-0.10, all the other are Fe and inevitable impurity.
Preferably, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.075-0.085, Si:0.6-0.7, Mn:1.35-1.45, P :≤0.008, S :≤0.003, Cr:0.65-0.75, Ni:0.4-0.6, Nb:0.13-0.17, B:0.006-0.009, Cu:0.45-0.55, Al:0.030-0.040, N:0.050-0.080, V:0.06-0.09, all the other are Fe and inevitable impurity.
Most preferably, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.080, Si:0.65, Mn:1.40, P :≤0.008, S :≤0.003, Cr:0.70, Ni:0.5, Nb:0.15, B:0.0075, Cu:0.50, Al:0.035, N:0.065, V:0.075, all the other are Fe and inevitable impurity.
The present invention has following beneficial effect
The present invention is by adjusting chemical composition, on the basis of lot of experiments, prepare the steel of above-mentioned chemical composition, wherein each element reaches synergistic action effect, make this steel pipe there is the heterogeneous structure of acicular ferrite+M/A or granular ferrite+acicular ferrite+M/A, have both high strength, excellent toughness and weldability, particularly there is good viscous deformation capacity and low strain aging sensitivity.Can meet the service requirementss to this pipe line steel and steel pipe based on strain piping design area such as Earthquake Fault Zone, intracraton basin, tundra, landslide band.Wherein yield strength 650-680Mpa, tensile strength 760-820Mpa, elongation 26-32%, uniform plastic deformation elongation 12-15%, strain aging sensitivity coefficient is less than 0.36, and the Charpy impact toughness of-20 ℃ reaches 330-380J.
Embodiment
Embodiment mono-
A kind of large strain steel pipe for oil and gas pipes, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.07, Si:0.8, Mn:1.30, P :≤0.008, S :≤0.003, Cr:0.8, Ni:0.3, Nb:0.2, B:0.005, Cu:0.6, Al:0.020, N:0.10, V:0.05, all the other are Fe and inevitable impurity.
Embodiment bis-
A kind of large strain steel pipe for oil and gas pipes, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.09, Si:0.5, Mn:1.50, P :≤0.008, S :≤0.003, Cr:0.6, Ni:0.7, Nb:0.1, B:0.01, Cu:0.4, Al:0.050, N:0.030, V:0.10, all the other are Fe and inevitable impurity.
Embodiment tri-
A kind of large strain steel pipe for oil and gas pipes, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.075, Si:0.7, Mn:1.35, P :≤0.008, S :≤0.003, Cr:0.75, Ni:0.4, Nb:0.17, B:0.006, Cu:0.55, Al:0.030, N:0.080, V:0.06, all the other are Fe and inevitable impurity.
Embodiment tetra-
A kind of large strain steel pipe for oil and gas pipes, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.085, Si:0.6, Mn:1.45, P :≤0.008, S :≤0.003, Cr:0.65, Ni:0.6, Nb:0.13, B:0.009, Cu:0.45, Al:0.040, N:0.050, V:0.09, all the other are Fe and inevitable impurity.
Embodiment five
A kind of large strain steel pipe for oil and gas pipes, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.080, Si:0.65, Mn:1.40, P :≤0.008, S :≤0.003, Cr:0.70, Ni:0.5, Nb:0.15, B:0.0075, Cu:0.50, Al:0.035, N:0.065, V:0.075, all the other are Fe and inevitable impurity.
Claims (3)
1. a large strain steel pipe for oil and gas pipes, it is characterized in that, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.07-0.09, Si:0.5-0.8, Mn:1.30-1.50, P :≤0.008, S :≤0.003, Cr:0.6-0.8, Ni:0.3-0.7, Nb:0.1-0.2, B:0.005-0.01, Cu:0.4-0.6, Al:0.020-0.050, N:0.030-0.10, V:0.05-0.10, all the other are Fe and inevitable impurity.
2. large strain steel pipe for a kind of oil and gas pipes as claimed in claim 1, it is characterized in that, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.075-0.085, Si:0.6-0.7, Mn:1.35-1.45, P :≤0.008, S :≤0.003, Cr:0.65-0.75, Ni:0.4-0.6, Nb:0.13-0.17, B:0.006-0.009, Cu:0.45-0.55, Al:0.030-0.040, N:0.050-0.080, V:0.06-0.09, all the other are Fe and inevitable impurity.
3. large strain steel pipe for a kind of oil and gas pipes as claimed in claim 2, it is characterized in that, the chemical composition of this steel pipe is made up of following component by weight percentage: C:0.080, Si:0.65, Mn:1.40, P :≤0.008, S :≤0.003, Cr:0.70, Ni:0.5, Nb:0.15, B:0.0075, Cu:0.50, Al:0.035, N:0.065, V:0.075, all the other are Fe and inevitable impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210434021.5A CN103789680A (en) | 2012-11-02 | 2012-11-02 | Large-strain steel tube for oil-gas pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210434021.5A CN103789680A (en) | 2012-11-02 | 2012-11-02 | Large-strain steel tube for oil-gas pipeline |
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| CN103789680A true CN103789680A (en) | 2014-05-14 |
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| CN201210434021.5A Pending CN103789680A (en) | 2012-11-02 | 2012-11-02 | Large-strain steel tube for oil-gas pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107735506A (en) * | 2015-06-17 | 2018-02-23 | 臼井国际产业株式会社 | Steel pipe as fuel injection pipe and its manufacture method |
-
2012
- 2012-11-02 CN CN201210434021.5A patent/CN103789680A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107735506A (en) * | 2015-06-17 | 2018-02-23 | 臼井国际产业株式会社 | Steel pipe as fuel injection pipe and its manufacture method |
| CN107735506B (en) * | 2015-06-17 | 2019-10-22 | 臼井国际产业株式会社 | Steel pipe as fuel injection pipe and its manufacturing method |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140514 |