CN106011666A - Low alloy steel, steel pipe and manufacturing method of steel pipe - Google Patents
Low alloy steel, steel pipe and manufacturing method of steel pipe Download PDFInfo
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- CN106011666A CN106011666A CN201610388669.1A CN201610388669A CN106011666A CN 106011666 A CN106011666 A CN 106011666A CN 201610388669 A CN201610388669 A CN 201610388669A CN 106011666 A CN106011666 A CN 106011666A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention provides low alloy steel with favorable carbon dioxide gas corrosion resistance and welded-part toughness. The low alloy steel comprises the following chemical component in percentage by mass: 0.0,035-0.02% of C, 3.0%-5.0% Cr, 0-0.1% of Si, 0.6-2.0% of Mn, Fe and inevitable impurities, wherein the relation between the Mn content [T.Mn] and the C content [T.C] conforms to the formula that [T.Mn] multiplied by [T.C] ranges from 0.007 to 0.03. The invention further provides a low alloy steel pipe made of the low alloy steel and a manufacturing method of the low alloy steel pipe, and the low alloy steel pipe has favorable carbon dioxide gas corrosion resistance and welded-part toughness.
Description
Technical field
The present invention relates to the petroleum gas delivering pipe road for energy field, particularly relate to for containing carbonic acid gas
Petroleum gas environment, possesses good resistance to carbonic acid gas corrosivity and the low-alloy steel of welding position toughness, and uses this conjunction
The low alloy steel of gold and manufacture method thereof.
Background technology
Oil well pipe that the production and transport of petroleum gas is used and pipeline, generally use carbon steel, low-alloy steel material.
But, the petroleum gas corrosion compared with the corrosion under common neutral moist environment or atmospheric corrosion, containing more carbonic acid gas
Speed is very fast, thus, the oil well pipe of petroleum gas production and transport CO 2 aerated to this highly corrosive and pipeline, generally
In oil, add corrosion inhibitor, in terms of the material of pipeline steel, use the 13%Cr steel that resistance to carbonic acid corrosivity is excellent.But one
Aspect, the corrosivity inhibitor used in oil is unfavorable to environmental conservation, on the other hand, uses stainless steel material pipeline costly
High, use limited time, use in the environment of etching condition is not the harshest, cost effectiveness can be beyond limiting.
For this problem, the local corrosion of general corrosion and welding position for improving carbonic acid gas, in JP 56-
No. 93856 publication clear stipulaties pipeline steel contain Cr 3～12%, containing C less than 0.1%.But this part of described invention of publication
The toughness of welding position relatively low.To this invention steel, when C content is reduced to below 0.01%, impact at the V-notch of 0 DEG C
Absorbing energy in test and be less than 16kg/mm2 (about below 160J), this kind of welded steel position toughness is relatively low.
It is desirable to develop the carbonic acid gas corrosive atmosphere that can be used in high-carbon acid gas petroleum gas, possess the most resistance to
Carbonic acid gas corrosivity and welding position low-temperature flexibility, and this kind of low-alloyed steel pipe of cheap low-alloy steel and use.
Summary of the invention
While the present invention adds the addition of C r for improving resistance to carbonic acid gas corrosivity, press down for improving the toughness of welding position
The content of C and Si processed, and make C Mn content or C Mn Mo content balance by particular kind of relationship formula.Composition includes by regulation content
Various low-alloy steel, use this kind of low-alloyed steel pipe and the manufacture method of this steel pipe, main component is as follows:
(1) chemical composition, by mass percentage, containing C:0.0035～0.02%, Cr:3.0%～5.0%, Si:
The relation of less than 0.1%, Mn:0.6～2.0% and this Mn amount [T.Mn] and C amount [T.C] meets [T.Mn] × [T.C] and exists
0.007～0.03, other parts are ferrum and unavoidable impurity, by this composition have good resistance to carbonic acid gas corrosivity with
The low-alloy steel of welding position toughness.
(2) additionally, by mass percentage, possibly together with Al:0.001～less than 0.20%, below N:0.015%, Ti:
0.001～0.2%, Nb:0.01～0.5%, other low-alloy steel recorded with above-mentioned (1), there is the corrosion of good resistance to carbonic acid gas
Property with welding position toughness.
(3) additionally, by mass percentage, by mass percentage, possibly together with Cu, Ni one or more of which, each composition exists
0.01%～1%, and other composition is with above-mentioned (1) and (2) record, the technical scheme being characterized with this content, has the most resistance to
Carbonic acid gas corrosivity and the low-alloy steel of welding position toughness.
(4) additionally, by mass percentage, possibly together with Mo:0.01%-1%, with [T.Mo], [T.Mn], [T.C] table respectively
Showing Mo, Mn, C content, the quantitative range of ([T.Mo]+[T.Mn]) × [T.C] is 0.007～0.03, and other composition is with above-mentioned
(1) to the record of (3) any one, the technical scheme being characterized with this content, there is good resistance to carbonic acid gas corrosivity and weld part
The low-alloy steel of position toughness.
The low-alloy steel recorded with above-mentioned (1)～(4) any one is that material manufactures, as the technical side of feature
Case, has the low alloy steel of good resistance to carbonic acid gas corrosivity and welding position toughness.
The present invention is applied to energy field, the oil well pipe of the production and transport of the most CO 2 aerated petroleum gas and pipe
Road, or the raw material properly used as factory.The present invention seeks to develop and be provided simultaneously with good resistance to carbonic acid gas corrosivity and weldering
Connect the low-alloy steel of position toughness and use this kind of low-alloyed steel pipe, and the manufacture method of this steel pipe is provided.
To above-mentioned low-alloy steel pipeline manufacture view, steel billet need to be fabricated to steel pipe by following operation, as the skill of feature
Art scheme, has the low-alloy steel electricity seam manufacture of steel pipe of good resistance to carbonic acid gas corrosivity and welding position toughness, and step is as follows:
(1), after being heated at temperature 1050 DEG C～1300 DEG C by steel billet, hot calender is carried out, then below 950 DEG C, Ar3
Complete the hot calender of reduction ratio more than 50% in temperature province more than critical point, then cool down with the rate of cooling of 20 DEG C/more than s
To less than 500 DEG C, then take out the Engineering operation of hot rolled coil；
(2), after above-mentioned hot rolled coil is pressed the steel strip cutting of specified width, which width, continuously shaped is cylindric, and each steel band two ends are welded
Connecting resistance and be fabricated to electricity seam steel pipe Engineering operation.
According to below in conjunction with the accompanying drawing detailed description to the specific embodiment of the invention, those skilled in the art will be brighter
Above-mentioned and other purposes, advantage and the feature of the present invention.
Accompanying drawing explanation
Describe some specific embodiments of the present invention the most by way of example, and not by way of limitation in detail.
Reference identical in accompanying drawing denotes same or similar parts or part.It should be appreciated by those skilled in the art that these
Accompanying drawing is not necessarily drawn to scale.In accompanying drawing:
Fig. 1 is to represent for 3%Cr steel, C content and Mn relation with contents schematic diagram.
Detailed description of the invention
The herein below explanation restricted reason of composition of steel of the present invention.% represents quality %.
C: carbon is the element improving hardness of steel.In the present invention, carbon content increase then welding position low-temperature flexibility and resistance to carbonic acid
Gas corrosion reduces, and particularly when carbon content is more than 0.02%, separates out a large amount of in steel drawing process from metallic crystal
Carbide causes welding position low-temperature flexibility to deteriorate and resistance to carbonic acid gas corrosivity reduces, and therefore, carbon content is defined to 0.02%.
According to the relation with manganese amount Yu temperature crosslink manganese [T.Mn], inventor, while reducing carbon content, makes corresponding Fe content one
More than definite value, finding out the proportioning making it have good welds portion low-temperature flexibility, minimum carbon amounts is determined by corresponding manganese amount, for preventing
Toughness lowers, and the addition of manganese self is the most restricted, and therefore, the lower limit of carbon content is 0.0035%.
Cr: chromium is the element that can effectively suppress carbonic acid gas to corrode, especially at the corrosive atmosphere that the present invention is targeted, and temperature
Degree 80, under conditions of DEG C more than pressure 0.1MPa, for obtaining enough resistance to carbonic acid gas corrosivity, chromium content must be more than 3%.
On the other hand, if chromium content more than 5%, in the case of being wherein mixed into oxide, it is possible to local corrosion occurs.
Si: silicon is the same element with deoxidation of same Al with Ti, can add on a small quantity.For the present invention needing improve welding
The steel of position low-temperature flexibility, silicone content is unfavorable to improving welding position low-temperature flexibility more than 0.1%, therefore on be limited to 0.1%.
Mn: manganese is the element that can be effectively improved low-temperature flexibility, need to add in right amount.For the present invention needing improve welding
Position low-temperature flexibility steel, for obtaining enough effects, Fe content is minimum must be more than 0.6%, and on the other hand, its content exceeds
2% can reduce toughness on the contrary, so, the content of manganese is scheduled on 0.6～2%.Additionally, its action effect is relevant to carbon content, this
A person of good sense finds that its relation is, needs to improve Fe content in the case of carbon content is low, needs to reduce the content of manganese in the case of carbon content height,
To obtain good welding position low-temperature flexibility.Therefore, carbon content temperature crosslink carbon [T.C] is handed over Fe content and temperature
Connection manganese [T.Mn] (represent quality %), its product is limited in more than 0.007, less than 0.03, with relational expression 0.007≤[T.Mn] ×
[T.C]≤0.03 represents.
Accompanying drawing 1 represents based on 3%Cr steel, it is possible under the conditions of keeping good welds position low-temperature flexibility, C content and Mn contain
The relation of amount.Evaluation test is: after the MIG welding of input heat 2.6kJ/mm is implemented, in otch central authorities commissure, use 2mmV
V notch v impact test sheet carries out Charpy impact test.For the Charpy impact test of-20 DEG C, absorb energy 30J with
On, low-temperature good toughness then represents with zero, absorb energy be discontented with 30J then with × represent.Rectangular area by invention steel basic
Composition range, and the correct composition range that region folded by two of which curve is steel of the present invention.Part toughness outside rectangle is not
Good, it is still that toughness is bad outside rectangle inner curve region, shows the part that toughness is bad in present component region in the drawings.
Additionally, be corrosion resistance or the welding position toughness improving the present invention, following component can be contained.
Al:Al Yu Si and Ti is all the element with deoxidation, and for making its effect give full play to, Al content need to be
More than 0.001%, on the other hand, if its content is more than 0.2%, steel cleanliness factor reduces, and low-temperature flexibility deteriorates.Therefore, add
In the case of Al, its content is 0.001%～0.2%.
N:N is the inevitable foreign body of residual in steel.For improving low-temperature flexibility, its content is the lowest more good, especially
Be N content more than 0.015% time low-temperature flexibility significantly deteriorate, therefore upper content limit is set to 0.015%.Ti, Nb:Ti and Nb are permissible
It is effectively improved the intensity of mother metal, forms trickle (Ti, Nb) carbide at welding heat affected zone row simultaneously, suppress austenite crystal grain length
Greatly, thus improve welding position toughness.For making its effect give full play to, Ti content need to be more than 0.001%, and Nb content need to be
More than 0.01%, on the other hand, add surplus and make Ti content more than 0.2%, Nb content also results in toughness and dislikes more than 0.5%
Change.So, the content range of Ti and Nb is, Ti is 0.001%～0.2%, and Nb is 0.01～0.5%.
It addition, add the Cu of less than 1%, one or more elements in Ni, Mo can increase the stability of anti-corrosion layer.Single
Solely add and compound difference of adding is little, need to add one or more to obtain corresponding corrosion resistance.But, any mode
Its effect just cannot be embodied, so minimum content is 0.01% less than 0.01% content.For Mo, as Mn, its content
Relevant to C content, the low-temperature flexibility of welding heat affected zone is also had an impact by its proportioning, and the relation that the C amount of interpolation and Mn measure is:
([T.Mn]+[T.Mo]) × [T.C] more than 0.007, less than 0.03.
Steel of the present invention adjusts metal structure through calendering and the heat treatment such as Q-tempering, it is possible to reach necessary intensity-
Low-temperature flexibility equilibrium point.And, use the manufacture of steel pipe of steel of the present invention, not particular restriction, seamless calendering tubing side
Method, welds tubing method etc. and all can use after steel plate forming.The steel pipe using these methods to manufacture, has good resistance to carbonic acid gas rotten
Erosion property and gas welding welding position toughness, additionally, the gap welding region toughness of seam steel pipe is the most excellent.At this moment seam weldering
Connect and electric seam welding can be used to connect, the submerged-arc welding of the bigger input heats such as laser welding.
But, the purpose of steel of the present invention intentionally gets cheap material, in various methods, especially by the following stated
Carrying out rolling control, electricity slit-tube manufacture maximum can give play to the effectiveness of the present invention.This calendering controls electricity slit-tube manufacture
Method is carried out by following operation:
(1), after being heated at temperature 1050 DEG C～1300 DEG C by steel billet, hot calender is carried out, then below 950 DEG C, Ar3
Complete the hot calender of reduction ratio more than 50% in temperature province more than critical point, then cool down with the rate of cooling of 20 DEG C/more than s
To less than 500 DEG C, then take out hot rolled coil；
(2), after above-mentioned hot rolled coil is pressed the steel strip cutting of specified width, which width, continuously shaped is cylindric, and each steel band two ends are welded
Connecting resistance and be fabricated to electricity seam steel pipe.The above-mentioned present invention well with resistance to carbonic acid gas corrosion type and intensity low-temperature flexibility
Steel, can be applicable to the various occasions requiring resistance to carbonic acid gas corrosivity.Can be used in especially resistance to carbonic acid gas corrosivity and weldering
Connect the pipeline that position low-temperature flexibility all requires, compared with the material in past, obtain aobvious in terms of reducing price and improving the life-span
Write effect.
Table 1 represents steel of the present invention and compares the chemical composition of steel, and corrosion resistance test, and welding position low-temperature flexibility is real
The result tested.Corrosion resistance test is in temperature 80, DEG C carbonic acid gas pressure 0.4MPa, and the formation water simulation of salt concentration 5% is molten
Liquid carries out the immersion test of two weeks by a definite date.1) for the test below degassing to dissolved oxygen amount concentration 10ppb, 2) it is dense at dissolved oxygen amount
The test of degree 100ppb.
Table 1
Corrosion resistance 1) and corrosion resistance 2): ◎ outstanding zero is good × poor ● have local defect
Welding position toughness: energy more than ◎ 200J zero 30-200J of-20 degrees Celsius of lower CHARPY impact test absorptions ×
Less than 30J
Table 1 show the corrosive evaluation result of resistance to carbonic acid gas: if with the etching extent of Cr content less than 0.01% carbon steel
Being 1, etching extent less than 0.2 represents with ◎, representing with zero of etching extent less than 0.5, and corrosion resistance is good but local corrosion occurs
Represent with stain.The evaluation test of welding position low-temperature flexibility is after the MIG welding of input heat 2.6kJ/mm is implemented, in
At otch central authorities bonding wire, use the Charpy impact test that 2mmV v notch v impact test sheet is carried out.Table 1 show welding position
The evaluation result of low-temperature flexibility: from the point of view of the Charpy impact test from-20 DEG C absorbs energometry result, absorbs energy 200J
Being more than that low-temperature flexibility is outstanding, represent with ◎, incomplete absorption 30J is that low-temperature flexibility is poor, with × represent, centre then represents with zero.
The steel chemical composition of numbering 1～18 is in the range of present invention provide that, for steel of the present invention, the tempering of numbering 19～23
Study point outside prescribed limit, for comparing steel.Steel of the present invention is respectively provided with good corrosion resistance and welding heat affected low temp area is tough
Property.
On the other hand, the comparison steel Low Temperature Impact Toughness of Heat-affected Zone of numbering 19～22 is the most not enough, numbering 23 sweating heat shadow
Ringing low temp area toughness good, but corrosion resistance is not enough, steel of the present invention has obvious superiority.Change additionally, press numbering 7 in table 1
The 150mm thickness heating steel billet to 1250 DEG C studied point, prolongs as 16mm to 1100 DEG C of intermittent fever, and when continuing to let cool 900 DEG C, calendering is
8mm is thick, is then directly water-cooled 500 DEG C with 30 DEG C/s speed, takes out hot rolled coil.After this hot rolled coil shapes at cold,
With high frequency welding electric seam welding adapter, so that it may produce the steel pipe of API specification X65 grade.After this steel pipe gas welding, at its weld seam
The neighbouring result using Charpy test film to measure Low Temperature Impact Toughness of Heat-affected Zone shows, at a temperature of-20 DEG C, weld seam is any
Position all can absorb 200J energy above.By above method, the steel that the low-temperature flexibility of welding heat affected zone is the highest can be manufactured
Pipe.
The present invention has good resistance to carbonic acid gas corrosivity, and reaches preferable intensity-low-temperature flexibility equilibrium point, welding position
The low-alloy steel of low-temperature good toughness, has very great help for the design of efficient energy industry machinery.
So far, although those skilled in the art will appreciate that the multiple of the most detailed present invention of illustrate and describing show
Example embodiment, but, without departing from the spirit and scope of the present invention, still can be direct according to present disclosure
Determine or derive other variations or modifications of many meeting the principle of the invention.Therefore, the scope of the present invention is it is understood that and recognize
It is set to and covers other variations or modifications all these.
Claims (6)
1. a low-alloy steel, it is characterised in that include following composition: chemical composition, by mass percentage, containing C:0.0035
～0.02%, Cr:3.0%～5.0%, below Si:0.1%, Mn:0.6～2.0% and this Mn amount [T.Mn] and C amount [T.C]
Relation meet [T.Mn] × [T.C] 0.007～0.03, other parts are ferrum and unavoidable impurity.
A kind of low-alloy steel the most according to claim 1, by mass percentage, possibly together with Al:0.001～0.20% with
Under, below N:0.015%, Ti:0.001～0.2%, Nb:0.01～0.5%.
The most according to claim 1 and 2 a kind of have good resistance to carbonic acid gas corrosivity and the low-alloy of welding position toughness
Steel, by mass percentage, possibly together with Cu, Ni one or more of which, each composition is 0.01%～1%.
4. according to a kind of low-alloy steel described in claim 1-3 any one, by mass percentage, possibly together with Mo:0.01%-
1%, with [T.Mo], [T.Mn], [T.C] represents Mo, Mn, C content, the quantitative range of ([T.Mo]+[T.Mn]) × [T.C] respectively
It is 0.007～0.03.
5. more than one state the low-alloy steel described in claim 1-4 any one be material manufacture there is good resistance to carbonic acid gas
Corrosivity and the low alloy steel of welding position toughness.
6. the method for low alloy steel a kind of described in a manufacturing claims 5, it is characterised in that step is as follows:
(1) after being heated at temperature 1050 DEG C～1300 DEG C by steel billet, carrying out hot calender, then below 950 DEG C, Ar3 is critical
Complete the hot calender of reduction ratio more than 50% in the temperature province that point is above, then be cooled to the rate of cooling of 20 DEG C/more than s
Less than 500 DEG C, then take out the Engineering operation of hot rolled coil；
(2) after above-mentioned hot rolled coil is pressed the steel strip cutting of specified width, which width, continuously shaped is cylindric, each steel band two ends welding electricity
Hinder and be fabricated to the Engineering operation of electricity seam steel pipe.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610388669.1A CN106011666A (en) | 2016-06-03 | 2016-06-03 | Low alloy steel, steel pipe and manufacturing method of steel pipe |
| PCT/CN2016/093512 WO2017206321A1 (en) | 2016-06-03 | 2016-08-05 | Low alloy steel, steel pipe and manufacturing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610388669.1A CN106011666A (en) | 2016-06-03 | 2016-06-03 | Low alloy steel, steel pipe and manufacturing method of steel pipe |
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| CN106011666A true CN106011666A (en) | 2016-10-12 |
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| WO (1) | WO2017206321A1 (en) |
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| CN103320705B (en) * | 2013-06-03 | 2015-05-27 | 南京钢铁股份有限公司 | Preparation method for CO2 corrosion resistant pipeline steel used for surface gathering |
| KR101893845B1 (en) * | 2014-03-31 | 2018-08-31 | 제이에프이 스틸 가부시키가이샤 | Steel material for highly deformable line pipes having superior strain aging resistance and superior hic resistance, method for manufacturing same, and welded steel pipe |
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2016
- 2016-06-03 CN CN201610388669.1A patent/CN106011666A/en active Pending
- 2016-08-05 WO PCT/CN2016/093512 patent/WO2017206321A1/en active Application Filing
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| CN1292429A (en) * | 2000-10-30 | 2001-04-25 | 宝山钢铁股份有限公司 | Low-alloy steel for oil casing pipe capable of resisting corrosion of CO2 and sea water |
| JP2002285281A (en) * | 2001-03-27 | 2002-10-03 | Nippon Steel Corp | Low alloy steel having excellent carbon dioxide corrosion resistance and weld zone toughness, linepipe and production method therefor |
| JP2004315859A (en) * | 2003-04-14 | 2004-11-11 | Nippon Steel Corp | Steel having excellent weldability and corrosion resistance |
| CN1775982A (en) * | 2005-11-24 | 2006-05-24 | 天津钢管集团有限公司 | Alloy-steel seam-less steel-pipe and production method therefor |
| JP2008127653A (en) * | 2006-11-22 | 2008-06-05 | Nippon Steel Corp | Corrosion resistant steel material having excellent rusting resistance in non-coating |
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