CN103451570B - A kind of oil-gas transportation spiral submerged welded pipe suitable in low temperature environment and manufacture method thereof - Google Patents
A kind of oil-gas transportation spiral submerged welded pipe suitable in low temperature environment and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses a kind of oil-gas transportation spiral submerged welded pipe suitable in low temperature environment and manufacture method thereof, described steel pipe mother metal is made up of following composition according to mass percent: C0.01～0.08, Si0.2～0.45, Mn0.8～1.8, Ni0.3～1.5, Mo0.1～0.3, Cr0.2～0.5, Cu0.1～0.3, Ti0.005～0.05, N0.001～0.005, Al0.005～0.05, P≤0.015, S≤0.002, and surplus is Fe and inevitable impurity element。Described steel pipe mother metal also includes B0.0001-0.0050%。This technological invention provides the benefit that, adopts the method in the present invention, it is possible to the effective impact flexibility improving pipeline steel tube mother metal and position while welding, without carrying out heat treatment。Adopt the oil-gas transportation SAW spiral welded pipe that the present invention produces, it is possible to meet the construction needs of more than-40 DEG C cold district oil gas pipeline。
Description
Technical field:
The invention belongs to transportation pipe manufacturing, relate to oil-gas transportation spiral submerged welded pipe and the manufacture method thereof of a kind of low-temperature good toughness。
Background technology:
Oil and gas pipes transport is long distance delivery oil, natural gas means of transportation most economical, the most rational。In recent years, along with the exhaustion of the easy christmas energy, the exploitation of petroleum resources has gradually extended to desert, frozen soil, ocean, Deng Nan fief district, polar region, and oil-gas mining difficulty is increasing, and the technology simultaneously for oil-gas transportation pipe requires also more and more higher。It addition, from environmental conservation angle, it is necessary to strengthen gas extraction amount。And from pipeline construction cost angle, then need to improve further grade of steel and the discharge pressure of line pipe, to reduce oil-gas transportation cost。At present, oil gas pipeline overall development trend is that high-strength and high ductility, wall thickening, corrosion resistance and deformability improve。
Oil and gas long distance pipeline pipe is generally adopted vertical masonry joint or spiral submerged welded pipe。The developed countries and regions such as American-European, Japanese, high-strength line-pipe steel pipe is mainly based on straight-line joint submerged arc welding tube。China then has certain advantage in the manufacturing technology of spiral submerged welded pipe。, recent studies indicate that, spiral submerged welded pipe is in pipeline crack arrest, and relatively straight-line joint submerged arc welding tube is advantageously meanwhile。Thus, develop high-strength tenacity spiral submerged welded pipe, the route of a long oil and gas pipeline with Chinese characteristics of can yet be regarded as。
The low-temperature flexibility used for cold district requires higher oil gas pipeline pipe, the developed country such as American-European, Japanese is based on straight-line joint submerged arc welding tube (such as patent CN101541994B, CN101484600B, CN101548026B), for spiral submerged welded pipe then shorter mention。
The current low-temperature steel kind of China mainly has low-alloy steel, 6% nickel steel, 9% nickel steel and austenitic stainless steel etc.。Low-alloy steel is mainly used in-70 DEG C of temperatures above environment, for less than-70 DEG C lower temperature environment steel, then selects nickel steel or austenitic stainless steel kind。The existing low-alloy low-temperature steel trade mark mainly has 3 kinds, it is 16Mn, 09Mn2V and 09MnTiCuRe respectively, the steel of above 3 kinds of trades mark all can reach more than 47J at-70 DEG C of ballistic works, but because its intensity is relatively low, yield strength is only 343MPa, it is impossible to meet high-pressure oil gas feed-line technique of pipe requirement。
By a line of transferring natural gas from the west to the east, the research and development of two wires engineering pipeline steel tube and pipe-line construction, the pipeline steel tube manufacture level of China has strided forward ranks advanced in the world。A line main line pipe of transferring natural gas from the west to the east mainly adopts X70 level submerged-arc welded (SAW) pipe, and two wires is then based on X80 level submerged-arc welded (SAW) pipe。The performance characteristics of both steel pipes fully meets the technical requirement of pipe-line in general environment。But for the pipeline of cold zone, unburied spanning pipe erection, the low-temperature flexibility of its low-temperature flexibility, especially position, Seam and heat effected zone still can not reach the service demand of pipeline。
Summary of the invention:
The invention provides the manufacture method of a kind of X70, X80 level spiral submerged welded pipe with good low-temperature toughness and this welded tube。Adopt the high intensity oil-gas transportation spiral submerged welded pipe that the present invention manufactures, it is possible to the construction solving more than-40 DEG C cold district oil gas pipeline needs。
The low-temperature flexibility good in order to realize welded tube, meet the weldability technological requirement that welded still pipe is good simultaneously, the present invention adopts low C, Mn to design, and promotes that bainitic transformation realizes ultra-fine grain shellfish tissue by adding appropriate Mo, it is ensured that steel plate possesses certain intensity；Add appropriate Cr simultaneously, reduce the microstructure segregation of steel band；Adding appropriate Ti, make steel in Thermal Cycle process, the TiN particle of disperse in steel can stop growing up of austenite crystal effectively, promotes that acicular ferrite precipitates out, thus significantly improving the toughness of Hi-Stren steel coarse grain heat affect zone；Add appropriate Ni, both improved the intensity of steel on the one hand, make again the level that the toughness maintenance of steel is higher on the other hand, and significantly reduce the ductile-brittle transition temperature of steel。By design above thinking, coordinate rational composition organizational controls technology, it is achieved that the spiral seam submerged-arc welding pipe hot-rolled coil of low-carbon micro steel-alloy material possesses good low-temperature flexibility and weldability；Simultaneously by special wlding design of alloy, realizing on the basis of plumb joint good strength coupling, weld seam has possessed good low-temperature flexibility。
The technical solution adopted in the present invention is as follows:
A kind of oil-gas transportation spiral submerged welded pipe suitable in low temperature environment, described steel pipe mother metal is made up of following composition according to mass percent: C0.01～0.08, Si0.2～0.45, Mn0.8～1.8, Ni0.3～1.5, Mo0.1～0.3, Cr0.2～0.5, Cu0.1～0.3, Ti0.005～0.05, N0.001～0.005, Al0.005～0.05, P≤0.015, S≤0.002, and surplus is Fe and inevitable impurity element。
Described steel pipe mother metal also includes B0.0001-0.0050%。
Described steel pipe mother metal adopts hot-rolled coil to roll as tubular body, and the weld seam of tubular body is in spiral distribution, and weld seam adopts inside and outside submerged-arc welding to weld。
Described steel pipe mother metal is according to mass percent, wherein: C0.01, Si0.2, Al0.005。
Described steel pipe mother metal thickness is less than or equal to 20mm。
Described weld seam is made up of following composition according to mass percent: C0.03～0.12, Si0.20～0.45, Mn0.8～1.8, Ni1.0～2.0, Mo0.1～0.40, Ti0.05～0.15, Cu0.1～0.3, N≤0.005, O≤0.005, H≤0.005。
Described steel pipe mother metal transverse yield strength is 550～630MPa。
The preparation method of described oil-gas transportation spiral submerged welded pipe, including: uncoiling, leveling, milling limit, pre-bending, molding, interior weldering and outside weld, mother metal layering and weld seam supersonic detection, weld seam x-ray inspection, pipe end is expanding, the water pressure test, weld seam supersonic detection, pipe end x-ray inspection, pipe end chamfered edge, finished product inspection labelling is put in storage。
Described preparation method, adopts forming machine to be rolled by hot-rolled coil as tubulose, and adopts welding material to carry out submerged arc welding inside and outside tubing。
Described preparation method, when carrying out inside and outside submerged arc welding, heat input is not more than 20kJ/cm。
This technological invention provides the benefit that, adopts the method in the present invention, it is possible to the effective impact flexibility improving pipeline steel tube mother metal and position while welding, without carrying out heat treatment。Adopt the oil-gas transportation SAW spiral welded pipe that the present invention produces, it is possible to meet the construction needs of more than-40 DEG C cold district oil gas pipeline。
Accompanying drawing illustrates:
Fig. 1 is the mother metal tissue metallograph of the present invention；
Fig. 2 is the seam organization metallograph of the present invention；
The HAZ that Fig. 3 is the present invention organizes metallograph；
Fig. 4-1 is HAZ ballistic work temperature transition curve；
Fig. 4-2 is HAZ section of shear temperature transition curve；
Fig. 5-1 weld impingement merit temperature transition curve；
Fig. 5-2 weld seam section of shear temperature transition curve；
Fig. 6-1 is mother metal ballistic work temperature transition curve；
Fig. 6-2 is mother metal section of shear temperature transition curve。
Detailed description of the invention:
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4-1, Fig. 4-2, Fig. 5-1, Fig. 5-2, Fig. 6-1 and Fig. 6-2, the present invention design by alloying component, in conjunction with modern micro alloyed steel controlled rolling process, obtain a kind of novel design of heterogeneous structure based on bainite (such as Fig. 1), achieve the low-temperature flexibility of material high and good welding processing performance, making to be maintained at more than 100J during its base metal tenacity-40 DEG C, the section of shear is more than 85%；Heat affected area toughness-40 DEG C is at more than 47J。Meanwhile, the present invention have also been devised the welding wire for submerged-arc welding of a kind of excellent in low temperature toughness, coordinates specific sintered flux to use, it is ensured that the toughness of weld seam reaches more than 47J when-40 DEG C, meets the toughness reguirements of oil gas pipeline in more than-40 DEG C low-temperature cold environment。
A kind of oil-gas transportation spiral submerged welded pipe suitable in low temperature environment, hot-rolled coil is adopted to roll as tubulose, and weld seam in spiral distribution is carried out inside and outside submerged arc welding make steel pipe, above-mentioned steel pipe mother metal is made up of the following component calculated by percentage to the quality: C0.01～0.08, Si0.2～0.45, Mn0.8～1.8, Ni0.3～1.5, Mo0.1～0.3, Cr0.2～0.5, Cu0.1～0.3, Ti0.005～0.05, N0.001～0.005, Al0.005～0.05, and limit P, S is P≤0.015, S≤0.002, surplus is Fe and inevitable impurity element。
The manufacturing procedure of this manufacture method includes: uncoiling, leveling, milling limit, pre-bending, molding, interior weldering and outside weld, mother metal layering and weld seam supersonic detection, weld seam x-ray inspection, pipe end is expanding, the water pressure test, weld seam supersonic detection, pipe end x-ray inspection, pipe end chamfered edge, finished product inspection labelling is put in storage。
In body mother metal, the content of C, Si, Al, P presses the lower limit control of component requirements。
Above-mentioned steel pipe mother metal thickness is below 20mm。
Above-mentioned steel pipe mother metal transverse yield strength is 550～630MPa。
The weld metal of steel pipe contains the following chemical element composition calculated by percentage to the quality: C0.03～0.12, Si0.20～0.45, Mn0.8～1.8, Ni1.0～2.0, Mo0.1～0.40, Ti0.05～0.15, Cu0.1～0.3, N≤0.005, O≤0.005, H≤0.005, add the B of trace, and when smelting, P, S, O are limited in alap level。
Adopt forming machine to roll as tubulose by hot-rolled coil by certain forming angle, and adopt the welding material described in (6) to carry out submerged arc welding inside and outside tubing。
When carrying out inside and outside submerged arc welding, heat input is not more than 20kJ/cm。
C:C mainly exists in steel in the way of solid solution, to improve austenitic quenching degree, obtains bainite structure and ensures to obtain in final tissue the hard phase constitution in a certain amount of MA island, but C content is unsuitable too much, otherwise can affect banded structure and welding performance。The best C content scope optimal control of this example is for less than 0.06%, and in wlding, the content of C is then smaller。
Si:Si is mainly present in steel in solid solution mode, it is suppressed that the formation of cementite during bainite transformation, makes carbon accumulate in the austenite not changed further, forms the MA constituent element of rich carbon, and can promote that polygonal ferrite generates。In order to reduce plasticity and the toughness of steel, and ensureing good welding performance, in this example, Si content controls is 0.2%～0.45%, and in steel, the content of Si is lower, more slightly higher in welding wire。
Mn:Mn can exist with solid solution condition, it is also possible to enters in cementite and replaces a part of Fe atom, plays solution strengthening effect, moreover it is possible to forms sulfide。Mn element is assembled in austenite, can improve stabilization of austenite。During Mn too high levels, increasing the weight of component segregation in steel, therefore, optimal control is below 1.6%。
Al:Al is strong ferrite former, and the membership that adds of Al makes austenite one phase district reduce and move to right。With Si, the impact of steel is similar, Al can suppress the generation of cementite, and add a small amount of Al when making steel and carry out deoxidation。But, during Al too high levels, in steel, the oxidation product of Al increases, and impurity content increases, and can reduce cleanliness factor and the surface property of steel。Al is as deoxidant element, it is necessary to adds more than 0.005%, but too much there is a possibility that low-temperature flexibility is deteriorated, it is advantageous to be less than 0.03%。
P, S:P can also suppress the precipitation of cementite in steel, and ferrite has significant solution strengthening effect。But, P content is too high, can affect the serviceability of steel, as steel can produce cold short effect at low temperatures。S is combined formation MnS in steel with Mn, reduces the effective content of Mn, reduces the hic resistance ability of steel simultaneously。In this example, P, S content in steel controls more low more good。
Mo:Mo can significantly improve austenitic stability in steel, it is suppressed that polygonal ferrite generates, and forms single acicular ferrite structure。In steel of the present invention, it is ensured that hot rolled strip is acicular ferrite or bainite structure, so needing to add a certain amount of Mo, usual 0.1% < Mo < 0.25%。
Cu, Cr, Ni: have very strong solution strengthening effect, and be among the austenite stabilizing elements, improve quenching degree, promotes that bainite generates, can also improve the resistance to corrosion of steel simultaneously。In the present invention, addition all controls about 0.2～0.3%, and Cr content can be more slightly higher。In wlding, the content of Ni can be higher, to improve the impact flexibility of weld seam。Simultaneously during Ni content height, corresponding Mn content reduces。
Ti:Ti first combines with N in steel and generates TiN, then combines with S, generates Ti4C2S2。Owing to the affinity of Ti and S is better than the affinity of Mn and S, thus increase with Ti content, Ti in steel4C2S2Compound increases gradually, and instead of MnS and be mingled with。Ti and S combines and generates Ti4C2S2Compound, makes steel medium sulphide content be mingled with nodularization。Appropriate Ti add in steel can crystal grain thinning, improve intensity, material adopts and controls the rolling of cold technique simultaneously, and can precipitate out TiN and TiC, fine grain TiC is the disperse educt hardening constituent effectively stoping grain growth。In the present invention, the content optimal control of Ti is 0.005%～0.05%。
B: welding metal can also contain B further。B is the element making the hardenability of welding metal increase, in order to improve intensity, it is preferable that containing more than 0.0001%。On the other hand, when the content of B is more than 0.0050%, effect damages toughness sometimes, it is therefore preferable that the upper limit is set as less than 0.0050%。
When raw material presses mentioned component design smelting, control the content of the elements such as P, S, O as far as possible, improve the degree of purity of steel。When rolling, by the control of thick, finish rolling drafts and coiling temperature, roll bending is organized grain size control 12 grades or thinner (as Fig. 1,2), the hot-rolled coil of intensity 550-630MPa rank can be obtained, roll bending thickness is at below 20mm。
Adopt spiral forming technique to be bent by roll bending as tubulose, and adopt inside and outside submerged arc welding, butt welding is got up。Welding intermittent fever input control at below 20kJ/cm, weld structure based on granular bainite (such as Fig. 3)。
Above content is in conjunction with concrete preferred implementation further description made for the present invention; it cannot be assumed that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention and be determined scope of patent protection by submitted claims。
Claims (6)
1. the oil-gas transportation spiral submerged welded pipe being applicable to low temperature environment, it is characterized in that: steel pipe mother metal is made up of following composition according to mass percent: C0.01～0.08, Si0.2～0.45, Mn0.8～1.8, Ni0.3～1.5, Mo0.1～0.3, Cr0.2～0.5, Cu0.1～0.3, Ti0.005～0.05, N0.001～0.005, Al0.005～0.05, P≤0.015, S≤0.002, surplus is Fe and inevitable impurity element；Weld seam is made up of following composition according to mass percent: C0.03～0.12, Si0.20～0.45, Mn0.8～1.8, Ni1.0～2.0, Mo0.1～0.40, Ti0.05～0.15, Cu0.1～0.3, N≤0.005, O≤0.005, H≤0.005；Described steel pipe mother metal thickness is equal to 20mm；Described steel pipe mother metal adopts hot-rolled coil to roll as tubular body, and the weld seam of tubular body is in spiral distribution, and weld seam adopts inside and outside submerged-arc welding to weld；Described steel pipe mother metal transverse yield strength is 550～630MPa。
2. oil-gas transportation spiral submerged welded pipe as claimed in claim 1, it is characterised in that: described steel pipe mother metal also includes B0.0001-0.0050%。
3. oil-gas transportation spiral submerged welded pipe as claimed in claim 1, it is characterised in that: described steel pipe mother metal is according to mass percent, wherein: C0.01, Si0.2, Al0.005。
4. the preparation method of the oil-gas transportation spiral submerged welded pipe as described in claim 1,2 or 3, it is characterised in that including: uncoiling, leveling, milling limit, pre-bending, molding, interior weldering and outside weld, mother metal layering and weld seam supersonic detection, weld seam x-ray inspection, pipe end is expanding, the water pressure test, weld seam supersonic detection, pipe end x-ray inspection, pipe end chamfered edge, finished product inspection labelling is put in storage。
5. preparation method as claimed in claim 4, it is characterised in that: adopt forming machine to be rolled by hot-rolled coil as tubulose, and adopt welding material to carry out submerged arc welding inside and outside tubing。
6. preparation method as claimed in claim 4, it is characterised in that: when carrying out inside and outside submerged arc welding, heat input is not more than 20kJ/cm。
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| CN104907731B (en) * | 2015-05-25 | 2017-03-08 | 武汉铁锚焊接材料股份有限公司 | A kind of corrosion-resisting steel welds special welding wire for submerged-arc welding |
| CN105525200B (en) * | 2016-02-03 | 2017-11-17 | 首钢总公司 | A kind of high intensity slurry delivery pipe line hot-rolled coil and its manufacture method |
| CN105643050A (en) * | 2016-02-29 | 2016-06-08 | 广船国际有限公司 | Single-side multiple-wire submerged-arc welding method of low-temperature and high-ductility steel |
| CN109487173B (en) * | 2018-11-21 | 2020-11-24 | 天津市华油钢管有限公司 | Corrosion-resistant spiral submerged-arc welded pipe for petroleum transportation and preparation method thereof |
| CN111571144B (en) * | 2020-05-27 | 2021-09-24 | 重庆工商大学 | Pipeline steel welding, heat treatment and rolling integrated forming method |
| CN113804488A (en) * | 2021-09-28 | 2021-12-17 | 澳普洛钻探工具(无锡)有限公司 | Welded pipe for geological exploration |
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Effective date of registration: 20181017 Address after: 100007 Dongzhimen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: Baoji Petroleum Steel Pipe Co., Ltd. Patentee after: China Petroleum and Natural Gas Group Co., Ltd. Address before: 721008 jiangtan Road, Baoji, Shaanxi 10 Patentee before: Baoji Petroleum Steel Pipe Co., Ltd. |