CN103451570A - Spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and manufacturing method thereof - Google Patents
Spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and manufacturing method thereof Download PDFInfo
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- CN103451570A CN103451570A CN2013103649635A CN201310364963A CN103451570A CN 103451570 A CN103451570 A CN 103451570A CN 2013103649635 A CN2013103649635 A CN 2013103649635A CN 201310364963 A CN201310364963 A CN 201310364963A CN 103451570 A CN103451570 A CN 103451570A
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Abstract
The invention discloses a spiral submerged-arc welded pipe for oil and gas transmission suitable for low temperatures and a manufacturing method thereof. A base metal of the steel pipe comprises the following components in percentage by weight: 0.01-0.08% of C, 0.2-0.45% of Si, 0.8-1.8% of Mn, 0.3-1.5% of Ni, 0.1-0.3% of Mo, 0.2-0.5% of Cr, 0.1-0.3% of Cu, 0.005-0.05% of Ti, 0.001-0.005% of N, 0.005-0.05% of Al, less than or equal to 0.015% of P, less than or equal to 0.002% of S, and the balance of Fe and inevitable impurities. The base metal of the steel pipe also comprises 0.0001-0.0050% of B. The spiral submerged-arc welded pipe and manufacturing method thereof disclosed by the invention have the beneficial effects that by using the method disclosed by the invention, the impact toughness of the base metal and welded position of pipeline pipe can be effectively improved without heat treatment; and a spiral submerged-arc welded pipe for oil and gas transmission produced by using the method disclosed by the invention can satisfy the construction needs of oil and gas transmission pipelines at cold areas with a temperature of above minus 40 DEG C.
Description
Technical field:
The invention belongs to the transportation pipe manufacturing, relate to the good oil gas of a kind of low-temperature flexibility and carry by spiral submerged welded pipe and manufacture method thereof.
Background technology:
Oil and gas pipes transportation is long, the most rational mode of transport most economical apart from transfer oil, Sweet natural gas.In recent years, along with the exhaustion of the easy christmas energy, the exploitation of hydrocarbon resources has extended to desert, frozen soil, ocean, Deng Nan fief district, polar region gradually, and the oil-gas mining difficulty is increasing, for oil gas, carries with the technical requirements of pipe also more and more higher simultaneously.In addition, from the environment protection angle, need to strengthen the gas extraction amount.And, from pipeline construction cost angle, need further to improve grade of steel and the transfer pressure of line pipe, carry cost to reduce oil gas.At present, transportation pipe line overall development trend is that high-strength and high ductility, wall thickening, solidity to corrosion and deformability improve.
General vertical masonry joint or the spiral submerged welded pipe of adopting of pipe for oil and gas long distance pipeline.Developed country and the area such as American-European, Japanese, high-strength line-pipe mainly be take straight-line joint submerged arc welding tube as main with steel pipe.Chinese there is certain advantage aspect the manufacturing technology of spiral submerged welded pipe.Simultaneously, research in recent years shows, spiral submerged welded pipe, aspect pipeline crack arrest, more has superiority than straight-line joint submerged arc welding tube.Thereby, development high-strong toughness spiral submerged welded pipe, the route of the oil gas long distance pipeline with Chinese characteristics of can yet be regarded as.
Pipe for the transportation pipe line that the low-temperature flexibility of using for cold district is had relatively high expectations, straight-line joint submerged arc welding tube (as patent CN101541994B, CN101484600B, CN101548026B) be take as main in the developed country such as American-European, Japanese, for spiral submerged welded pipe shorter mention.
The current low-temperature steel kind of China mainly contains low alloy steel, 6% nickel steel, 9% nickel steel and austenitic stainless steel etc.Low alloy steel is mainly used in temperature environment more than-70 ℃, for-70 ℃ of following lower temperature environment steel, selects nickel steel or austenitic stainless steel kind.The existing low-alloy low-temperature steel trade mark mainly contains 3 kinds, respectively 16Mn, 09Mn2V and 09MnTiCuRe, the steel of above 3 kinds of trades mark are more than-70 ℃ of ballistic works all can reach 47J, but because of its intensity lower, yield strength is only 343MPa, can't meet the technique of pipe requirement of high-pressure oil gas line of pipes.
Use research and development and the pipe-line construction of pipeline steel tube by the line of transferring natural gas from the west to the east, two wires engineering, the pipeline steel tube manufacture level of China has strided forward ranks advanced in the world.The line main line pipe of transferring natural gas from the west to the east mainly adopts X70 level submerged-arc welded (SAW) pipe, and X80 level submerged-arc welded (SAW) pipe be take as main in two wires.The characteristic of property of these two kinds of steel pipes meets the technical requirement of pipe-line in general environment fully.But the pipeline set up for cold zone, exposed suspended span, the low-temperature flexibility at its low-temperature flexibility, especially Seam and heat effected zone position still can not reach the service demand of pipeline.
Summary of the invention:
The invention provides a kind of manufacture method with X70, X80 level spiral submerged welded pipe and this welded tube of good low-temperature toughness.Spiral submerged welded pipe is used in the high strength oil gas conveying that adopts the present invention to manufacture, and can solve the construction needs of cold district transportation pipe line more than-40 ℃.
For the low-temperature flexibility that realizes that welded tube is good, meet the weldability processing requirement that Welded Steel Pipe is good simultaneously, the present invention adopts low C, Mn design, by adding appropriate Mo, promotes bainitic transformation to realize superfine crystal particle shellfish tissue, has guaranteed that steel plate possesses certain intensity; Add appropriate Cr simultaneously, reduce the microstructure segregation of steel band; Add appropriate Ti, make steel in the Thermal Cycle process, the TiN particle of disperse in steel can stop growing up of austenite crystal effectively, promotes acicular ferrite to separate out, thereby significantly improves the toughness of Hi-Stren steel coarse-grain heat affected zone; Add appropriate Ni, both improved on the one hand the intensity of steel, make again on the other hand the toughness of steel keep higher level, and significantly reduce the ductile-brittle transition temperature of steel.By above mentality of designing, coordinate reasonable component organizational controls technology, realized that the spiral seam submerged-arc welding pipe of low-carbon micro steel-alloy material possesses good low-temperature flexibility and weldability with hot-rolled coil; By special wlding design of alloy, on the basis of realizing welding joint good strength coupling, weld seam has possessed good low-temperature flexibility simultaneously.
The technical solution adopted in the present invention is as follows:
A kind of oil gas that is applicable to low temperature environment is carried and is used spiral submerged welded pipe, described steel pipe mother metal is comprised 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.
Described steel pipe mother metal also comprises B0.0001-0.0050%.
Described steel pipe mother metal adopts hot-rolled coil to roll as tubular body arranged inside, and the weld seam of tubular body arranged inside is in spiral distribution, and weld seam adopts inside and outside union-melt weld to be welded.
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 comprised 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.
Described oil gas is carried the preparation method with spiral submerged welded pipe, comprising: uncoiling, leveling, mill limit, pre-bending, moulding, interior weldering and outside weld, mother metal layering and weld seam supersonic detection, weld seam x-ray inspection, the pipe end hole enlargement, the water test, weld seam supersonic detection, pipe end x-ray inspection, the pipe end chamfered edge, finished product inspection mark warehouse-in.
Described preparation method, adopt forming machine that hot-rolled coil is rolled as tubulose, and adopt welding material to carry out submerged arc welding inside and outside tubing.
Described preparation method, while carrying out inside and outside submerged arc welding, heat input is not more than 20kJ/cm.
The present technique beneficial effect of the invention is that the method in employing the present invention, can effectively improve the impelling strength of pipeline steel tube mother metal and position while welding, and not need to heat-treat.SAW spiral welded pipe is used in the oil gas conveying that adopts the present invention to produce, and can meet the construction needs of cold district transportation pipe line more than-40 ℃.
The accompanying drawing explanation:
Fig. 1 is that mother metal of the present invention is organized metallograph;
Fig. 2 is seam organization metallograph of the present invention;
Fig. 3 is that HAZ of the present invention organizes metallograph;
Fig. 4-1 is HAZ ballistic work temperature transition curve;
Fig. 4-2 are HAZ shear area temperature transition curve;
Fig. 5-1 weld seam ballistic work temperature transition curve;
Fig. 5-2 weld seam shear area temperature transition curve;
Fig. 6-1 is mother metal ballistic work temperature transition curve;
Fig. 6-2 are mother metal shear area temperature transition curve.
Embodiment:
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 is by the design of alloying constituent, in conjunction with modern micro-alloyed steel controlled rolling process, obtaining a kind of novel bainite of take is the heterogeneous structure design (as Fig. 1) of leading, low-temperature flexibility that material is good and good welding processing performance have been realized, more than remaining on 100J while making its base metal tenacity-40 ℃, shear area is greater than 85%; Heat affected zone toughness-40 are ℃ more than 47J.Simultaneously, the present invention has also designed a kind of welding wire for submerged-arc welding of excellent in low temperature toughness, coordinates specific sintered flux to use, and the toughness that can guarantee weld seam has met the toughness reguirements of transportation pipe line in the low-temperature cold environment more than-40 ℃ reach 47J in the time of-40 ℃ more than.
A kind of oil gas that is applicable to low temperature environment is carried and is used spiral submerged welded pipe, adopt hot-rolled coil to roll as tubulose, and weld seam in spiral distribution is carried out to inside and outside submerged arc welding and make steel pipe, above-mentioned steel pipe mother metal is grouped into by the following one-tenth of calculating 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 restriction P, S is P≤0.015, S≤0.002, surplus is Fe and inevitable impurity element.
The manufacturing procedure of this manufacture method comprises: uncoiling, and leveling, mill limit, pre-bending, moulding, interior weldering and outside weld, mother metal layering and weld seam supersonic detection, weld seam x-ray inspection, pipe end hole enlargement, the water test, weld seam supersonic detection, pipe end x-ray inspection, pipe end chamfered edge, finished product inspection mark warehouse-in.
In the body mother metal, the content of C, Si, Al, P is controlled by the lower limit of composition requirement.
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 of calculating by percentage to the quality and forms: 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 micro-B, and when smelting, P, S, O are limited in to alap level.
Adopt forming machine that hot-rolled coil is rolled as tubulose by certain forming angle, and adopt (6) described welding material to carry out submerged arc welding inside and outside tubing.
While carrying out inside and outside submerged arc welding, heat input is not more than 20kJ/cm.
C:C main mode with solid solution in steel exists, and to improve austenitic hardening capacity, obtain bainite structure and also guarantee to obtain the hard phase constitution in a certain amount of MA island in final tissue, but C content should not be too much, otherwise can affect banded structure and welding property.This routine best C content range optimal control is being below 0.06%, and in wlding, the content of C is smaller.
Si:Si mainly is present in steel in the solid solution mode, and the formation of cementite during the inhibition bainite transformation, further accumulate in the austenite do not changed carbon, forms the MA constituent element of rich carbon, and can promote polygonal ferrite to generate.In order not reduce plasticity and the toughness of steel, and guarantee good welding property, in this example, the control of Si content is 0.2%～0.45%, and in steel, the content of Si is low, slightly higher in welding wire.
Mn:Mn can exist with solid solution condition, also can enter in cementite and replace a part of Fe atom, plays solution strengthening effect, can also form sulfide.The Mn element is assembled in austenite, can improve stabilization of austenite.During the Mn too high levels, can increase 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 the austenite one phase district dwindle and move to right.Similar on the impact of steel with Si, Al can suppress the generation of cementite, and steel-making the time adds a small amount of Al to carry out deoxidation.Yet, during the Al too high levels, in steel, the oxidation products of Al increases, foreign matter content increases, and can reduce cleanliness factor and the surface property of steel.Al, as deoxidant element, must add more than 0.005%, but too much likely make the low-temperature flexibility variation, so be preferably below 0.03%.
P, S:P also can suppress separating out of cementite in steel, and ferrite is had to significant solution strengthening effect.But the P too high levels, can affect the use properties of steel, as steel at low temperatures can produce cold short effect.S is combined with Mn and is formed MnS in steel, reduces the effective content of Mn, reduces the anti-HIC ability of steel simultaneously.In this example, P, the S content in steel is controlled more low better.
Mo:Mo can obviously improve austenitic stability in steel, suppresses polygonal ferrite and generates, and forms single acicular ferrite structure.In steel of the present invention, guarantee that hot rolled strip is acicular ferrite or bainite structure, so need to add a certain amount of Mo, common 0.1%<Mo<0.25%.
Cu, Cr, Ni: very strong solution strengthening effect is arranged, and be all the austenite stable element, improve hardening capacity, promote bainite to generate, can also improve the resistance to corrosion of steel simultaneously.In the present invention, add-on all is controlled at 0.2～0.3% left and right and gets final product, and Cr content can be slightly higher.In wlding, the content of Ni can be higher, to improve the impelling strength of weld seam.When Ni content is high simultaneously, corresponding Mn content reduces.
In Ti:Ti elder generation and steel, N, in conjunction with generating TiN, then, with the S combination, has generated Ti
4c
2s
2.Because the avidity of Ti and S is better than the avidity of Mn and S, thereby increase Ti in steel with Ti content
4c
2s
2compound increases gradually, and has replaced MnS and be mingled with.Ti and S are in conjunction with generating Ti
4c
2s
2compound, make the steel medium sulphide content be mingled with nodularization.But appropriate Ti adds crystal grain thinning in steel, improve intensity, material adopts the cooling control technology rolling simultaneously, can separate out TiN and TiC, and fine grain TiC is the disperse educt strengthening phase that effectively stops grain growth.In the present invention, the content optimal control of Ti is 0.005%～0.05%.
B: welding metal also can further contain B.B is the element that makes the hardenability increase of welding metal, in order to improve intensity, preferably contains more than 0.0001%.On the other hand, when the content of B surpasses 0.0050%, effect is damaged toughness sometimes, therefore, preferably the upper limit is set as below 0.0050%.
When starting material are pressed mentioned component design smelting, control the content of the elements such as P, S, O as far as possible, improve the purity of steel.When rolling, by the control of thick, finish rolling draught and coiling temperature, organize grain fineness number to be controlled at 12 grades or thinner (as Fig. 1,2) roll bending, can obtain other hot-rolled coil of intensity 550-630MPa level, roll bending thickness is below 20mm.
Adopt spiral forming technique that roll bending is bent as tubulose, and adopt inside and outside submerged arc welding, butt welding is got up.During welding, hot input control is below 20kJ/cm, and weld structure be take granular bainite as main (as Fig. 3).
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by submitted to claims.
Claims (10)
1. an oil gas that is applicable to low temperature environment is carried and is used spiral submerged welded pipe, it is characterized in that: described steel pipe mother metal is comprised 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.
2. oil gas as claimed in claim 1 is carried and is used spiral submerged welded pipe, and it is characterized in that: described steel pipe mother metal also comprises B0.0001-0.0050%.
3. oil gas as claimed in claim 1 is carried and is used spiral submerged welded pipe, and it is characterized in that: described steel pipe mother metal is according to mass percent, wherein: C0.01, Si0.2, A10.005.
4. oil gas as claimed in claim 1 is carried and is used spiral submerged welded pipe, and it is characterized in that: described steel pipe mother metal thickness is less than or equal to 20mm.
5. oil gas as claimed in claim 1 is carried and used spiral submerged welded pipe, it is characterized in that: described steel pipe mother metal adopts hot-rolled coil to roll as tubular body arranged inside, and the weld seam of tubular body arranged inside is in spiral distribution, and weld seam adopts inside and outside union-melt weld to be welded.
6. oil gas as claimed in claim 1 is carried and is used spiral submerged welded pipe, and it is characterized in that: described weld seam is comprised 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.
7. carry and use spiral submerged welded pipe as claim 1,2,3,4,5 or 6 described oil gas, it is characterized in that: described steel pipe mother metal transverse yield strength is 550～630MPa.
8. carry the preparation method with spiral submerged welded pipe as claim 1,2,3,4,5 or 6 described oil gas, it is characterized in that, comprising: uncoiling, leveling, mill limit, pre-bending, moulding, interior weldering and outside weld, mother metal layering and weld seam supersonic detection, weld seam x-ray inspection, pipe end hole enlargement, the water test, weld seam supersonic detection, the pipe end x-ray inspection, pipe end chamfered edge, finished product inspection mark warehouse-in.
9. preparation method as claimed in claim 8, is characterized in that: adopt forming machine that hot-rolled coil is rolled as tubulose, and adopt welding material to carry out submerged arc welding inside and outside tubing.
10. preparation method as claimed in claim 8 is characterized in that: while carrying out inside and outside submerged arc welding, heat input is not more than 20kJ/cm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104907731A (en) * | 2015-05-25 | 2015-09-16 | 武汉铁锚焊接材料股份有限公司 | Special submerged-arc welding wire for corrosion-resistant steel welding |
| CN105525200A (en) * | 2016-02-03 | 2016-04-27 | 首钢总公司 | Hot-rolled coiled plate for high-strength slurry conveying pipeline and manufacturing method for hot-rolled coiled plate |
| 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 |
| CN109487173A (en) * | 2018-11-21 | 2019-03-19 | 天津市华油钢管有限公司 | A kind of corrosion resistant oil transportation spiral submerged welded pipe and preparation method thereof |
| CN111571144A (en) * | 2020-05-27 | 2020-08-25 | 重庆工商大学 | Pipeline steel welding, heat treatment and rolling integrated forming method |
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| CA2822966A1 (en) * | 2011-02-02 | 2012-08-09 | Kabushiki Kaisha Kobe Seiko Sho(Kobe Steel, Ltd.) | Weld metal excellent in hydrogen embrittlement resistance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907731A (en) * | 2015-05-25 | 2015-09-16 | 武汉铁锚焊接材料股份有限公司 | Special submerged-arc welding wire for corrosion-resistant steel welding |
| CN105525200A (en) * | 2016-02-03 | 2016-04-27 | 首钢总公司 | Hot-rolled coiled plate for high-strength slurry conveying pipeline and manufacturing method for hot-rolled coiled plate |
| 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 |
| CN109487173A (en) * | 2018-11-21 | 2019-03-19 | 天津市华油钢管有限公司 | A kind of corrosion resistant oil transportation spiral submerged welded pipe and preparation method thereof |
| CN111571144A (en) * | 2020-05-27 | 2020-08-25 | 重庆工商大学 | Pipeline steel welding, heat treatment and rolling integrated forming method |
| CN111571144B (en) * | 2020-05-27 | 2021-09-24 | 重庆工商大学 | Pipeline steel welding, heat treatment and rolling integrated forming method |
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| CN103451570B (en) | 2016-06-22 |
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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. |