CN101082099A - Low-yield-ratio straight welding oil annular tube steel and manufacturing method thereof - Google Patents
Low-yield-ratio straight welding oil annular tube steel and manufacturing method thereof Download PDFInfo
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Abstract
The low yield-tensile ratio steel for straight welded petroleum casing pipe consists of C 0.2-0.3 wt%, Si 0.1-0.5 wt%, Mn 0.8-1.5 wt%, P not more than 0.02 wt%, S not more than 0.01 wt%, Al 0.005-0.050 wt% and Fe and inevitable impurities for the rest. It is produced through smelting in a converter or an electric furnace, casting plate blank, rolling at 1200-1300 deg.c to form strip steel, finish rolling at 800-900 deg.c, stream cooling at the rate of 50-150 deg/min to below 600 deg.c, and winding. It has yield-tensile ratio of about 0.70, and is suitable for producing K55 welded petroleum casing pipe.
Description
Technical field
The present invention relates to a kind of manufacturing of steel for longitudinal resistance welded pipe, the particularly low yield strength ratio APIK55 steel level oil bushing manufacturing of steel.
Background technology
The API standard code can be made petroleum casing pipe with seamless tube and longitudinal welded pipe.With regard to the straight weld sleeve pipe, traditional production technique is: according to the needs of sleeve pipe performance, design suitable chemical ingredients; Smelting also rolls into hot-rolled sheet coil; Coiled sheet is made the pipe material by moulding and vertical masonry joint resistance welding mode; Steel pipe seam or steel pipe integral are heat-treated; And pipe end is carried out suitable screw thread process, final production goes out qualified petroleum casing pipe.
With regard to the K55 steel level oil bushing, standard code: the yield strength of body between 379～552MPa, tensile strength 〉=655MPa.
After considering the tubulation moulding, because the effect of work hardening, tube body performance is compared with the coiled sheet performance, yield strength can increase, tensile strength is constant substantially, and therefore the coiled sheet yield strength that provides should be controlled at below the 500MPa, and tensile strength should be controlled at more than the 670MPa.Corresponding coiled sheet yield tensile ratio is no more than 0.75, preferably should be controlled at below 0.70 in the actual production.
For obtaining the hot-rolled sheet coil of this low yield strength ratio, consider from the composition design angle, should adopt carbon manganese steel.Such as the K55 seamless tube, the basic in the world 37Mn5 material that contains 0.37%C, 1.5%Mn that adopts, its carbon equivalent has surpassed 0.6, rolls the back yield strength about 450MPa, and tensile strength is more than 700MPa.But for welded tube production,, also need two coiled sheets are carried out the CO2 shielded welding between end to end, so that realize the multireel continuous production except needs carry out the electrical induction heating fusing back extruding welding the plate flanging part.Therefore, from soldering angle, must the carbon equivalent of coiled sheet be limited to some extent.In order well to carry out coiled sheet butt welding end to end, generally all the carbon equivalent of coiled sheet is controlled at below 0.40.
For the K55 grade of steel, if only rely on the carbon manganese element, under the situation of 0.40 following carbon equivalent, its coiled sheet tensile strength is difficult to surpass 670MPa, therefore needs to add alloying element, to improve tensile strength.But problem is that being added in of alloying element also improved yield strength, the low yield strength ratio coiled sheet that can not obtain requiring when improving tensile strength.
Have only minority enterprise can produce the K55 petroleum casing pipe at present in the world, the Corby pipe mill of British Steel Corporation (BSC) is exactly typical case's representative wherein.It adopts 2 kinds of compositions to produce the K55 sleeve pipe, and its composition design sees Table 1.
The table 1BSC K55 of company chemical ingredients
| C | Si | Mn | P | S | Nb | V | Al | |
| A | 0.17 0.22 | 0.25 0.35 | 1.3 1.5 | ≤0.025 | ≤0.015 | 0.01 0.024 | 0.1 0.13 | 0.025 0.065 |
| B | 0.33 0.37 | 0.10 0.35 | 1.35 1.55 | ≤0.025 | ≤0.015 | 0.025 0.065 |
Wherein, the A composition only relies on the carbon manganese element because carbon content is lower, and its coiled sheet can't reach the K55 performance requriements, has therefore added higher V and Nb element, and its V content has surpassed 0.1%.The compound adding of the adding of more alloying element, particularly V, Nb when improving Tensile strength, also can improve YIELD STRENGTH greatly, so the coiled sheet performance is difficult to reach the requirement of low yield strength ratio.For this reason, need be heated to 1100 ℃ behind the welded tube tubulation once more, reduce its yield strength, make the K55 sleeve pipe through tension reducing.But adopt this technology, increased the tubulation cost greatly; B composition coiled sheet carbon manganese content is higher, and its carbon equivalent can not be carried out coiled sheet butt welding end to end near 0.6, can only monovolume production when tubulation, will reduce production efficiency greatly.And need be heated to 880 ℃ of normalizing treatment behind its welded tube tubulation once more and make the K55 sleeve pipe, also improve production cost.
Summary of the invention
The object of the present invention is to provide a kind of low-yield-ratio straight welding oil annular tube steel and manufacture method thereof, adopt the design of carbon manganese steel composition, the yield tensile ratio of coiled sheet can be controlled at about 0.70, produce qualified K55 welded tube coiled sheet.
For achieving the above object, technical scheme of the present invention is, a kind of low-yield-ratio straight welding oil annular tube steel, and its composition quality per-cent:
C：0.2～0.3
Si：0.1～0.5
Mn：0.8～1.5
P：≤0.02
S：≤0.01
Al：0.005～0.050
All the other are Fe and inevitable impurity.
Or on the basis of mentioned component, add: V:0.01～0.1%.
The manufacture method of low-yield-ratio straight welding oil annular tube steel of the present invention, molten steel are through converter or electrosmelting, and slab is made in casting.Slab rolls into strip after 1200～1300 ℃ of heating, the finishing temperature of strip is between 800～900 ℃, rolling the back strip cools off through laminar flow, be cooled to coil into coiled sheet below 600 ℃ with 50～150 ℃/minute speed, preferred 500～600 ℃ coil into coiled sheet, be in reeling machine optimal working temp scope, be easy to realize production operation.So far, produce for making the hot rolled coil that the K55 welded tube is used.
Adopt steel grade of the present invention, under 800～900 ℃ finish to gauge condition, within rolling in back 10 seconds, dynamic and static recrystallize can not take place, the rolling deformation of crystal grain only can take place.Be cooled to the speed of steel pipe with 50～150 ℃/minute to batch below 600 ℃ this moment, helps thinning microstructure, production high-performance petroleum casing pipe.
C:0.2～0.3, C is a carbide forming element, can improve the intensity of steel, DeGrain when too low, too Gao Shihui reduces the welding property of steel greatly.
Mn:0.8～1.5, Mn is an austenite former, can improve the hardening capacity of steel, and content is not obvious less than effect in 0.8 o'clock, and content increased the microstructure segregation in the steel greatly greater than 1.5 o'clock, influenced the homogeneity of hot rolling microstructure.
V:0.01～0.1 can crystal grain thinning, forms carbide, improves the intensity and the toughness of steel.But when content reached a certain amount of, its effect increase was just not obvious, simultaneously because price is very high, so want prohibitive amount.
Above-mentioned coiled sheet adopts CO
2The shielded welding mode is carried out coiled sheet butt welding end to end.Carry out 100～200 ℃ of preheatings according to the different thickness specification before the butt welding, or postwelding is carrying out stress relief annealing below 200 ℃.
Coiled sheet carries out online weld seam thermal treatment to welded tube behind continuously shaped, resistance welding (ERW).The weld seam thermal treatment process can be that normalizing also can be to quench to add the tempering processing.
Compare with the Corby pipe mill K55 of British Steel Corporation (BSC), the present invention adopts the coiled sheet with its heterogeneity, and its carbon equivalent generally about 0.4, can be carried out coiled sheet butt welding end to end fully, helps enhancing productivity.On the basis of carbon manganese steel, can not add or only add the V element of trace, outside de-carbon manganese in the material, substantially there are not other microalloy elements, can obtain lower yield tensile ratio, behind the ERW tubulation, do not need to carry out again the distortion of complete heat treatment or tension reducing, only need butt welded seam to carry out online thermal treatment, can reduce production costs greatly.
Embodiment
Enumerate embodiment below, chemical ingredients sees Table 2, and mechanical property sees Table 3.As seen, adopt the present invention can produce the welding petroleum sheath that satisfies the K55 performance requriements.
Table 2
| C | Si | Mn | V | Al | S | P | Mo | Nb | |
| Embodiment 1 | 0.25 | 0.10 | 1.11 | 0.03 | 0.050 | 0.005 | 0.019 | / | / |
| Embodiment 2 | 0.29 | 0.27 | 0.81 | / | 0.035 | 0.002 | 0.017 | / | / |
| Embodiment 3 | 0.20 | 0.25 | 1.47 | 0.05 | 0.02 | 0.01 | 0.015 | / | / |
| Embodiment 4 | 0.21 | 0.38 | 1.21 | / | 0.015 | 0.007 | 0.008 | / | / |
| Embodiment 5 | 0.23 | 0.49 | 1.25 | 0.01 | 0.005 | 0.003 | 0.012 | / | / |
| Embodiment 6 | 0.27 | 0.19 | 1.50 | 0.09 | 0.008 | 0.009 | 0.016 | / | / |
| Comparative example 1 | 0.21 | 0.20 | 1.20 | / | 0.025 | 0.011 | 0.017 | 0.25 | 0.03 |
| Comparative example 2 | 0.19 | 0.33 | 1.18 | / | 0.035 | 0.008 | 0.015 | / | 0.03 |
| Comparative example 3 | 0.18 | 0.32 | 1.36 | / | 0.015 | 0.005 | 0.015 | / | / |
| Comparative example 4 | 0.31 | 0.26 | 1.01 | / | 0.027 | 0.007 | 0.011 | / | / |
| Comparative example 5 | 0.25 | 0.22 | 1.11 | 0.03 | 0.05 | 0.005 | 0.019 | / | / |
Table 3
| Coiling technique | Intensity MPa | ||
| σ0.5 | σb | ||
| Embodiment 1 | 580℃ | 484 | 688 |
| Embodiment 2 | 600℃ | 530 | 678 |
| Embodiment 3 | 540℃ | 515 | 709 |
| Embodiment 4 | 500℃ | 470 | 673 |
| Embodiment 5 | 530℃ | 500 | 686 |
| Embodiment 6 | 550℃ | 510 | 675 |
| Comparative example 1 | 550℃ | 580 | 657 |
| Comparative example 2 | 520℃ | 460 | 590 |
| Comparative example 3 | 510℃ | 520 | 636 |
| Comparative example 4 | 600℃ | 560 | 690 |
| Comparative example 5 | 610℃ | 440 | 630 |
By table 4 as seen, in 500～600 coiling temperature scopes of regulation, the intensity of embodiment 1～embodiment 6 all satisfies the yield strength of body between 379～552MPa, the requirement of tensile strength 〉=655MPa.
Comparative example 5 coiling temperatures are higher than prescribed value, make tensile strength not reach requirement.Comparative example 1 and comparative example 4 are because alloying element or carbon are too much, and yield strength is higher.Then because carbon manganese element content is low excessively, tensile strength is on the low side for comparative example 2 and comparative example 3.
Claims (4)
1. low-yield-ratio straight welding oil annular tube steel, its composition quality per-cent is:
C： 0.2～0.3
Si：0.1～0.5
Mn：0.8～1.5
P： ≤0.02
S： ≤0.01
Al：0.005～0.050
All the other are Fe and unavoidable impurities.
2. low-yield-ratio straight welding oil annular tube steel as claimed in claim 1 is characterized in that, also comprises V:0.01～0.1, by percentage to the quality.
3. the manufacture method of low-yield-ratio straight welding oil annular tube steel as claimed in claim 1 or 2, it comprises that molten steel is pressed mentioned component through converter or electrosmelting, and slab is made in casting; Slab rolls into strip after 1200～1300 ℃ of heating, the finishing temperature of strip is rolled the back strip and cooled off through laminar flow between 800～900 ℃, is cooled to coil into coiled sheet below 600 ℃ with 50～150 ℃/minute speed.
4. the manufacture method of low-yield-ratio straight welding oil annular tube steel as claimed in claim 3 is characterized in that, strip is cooled to 500～600 ℃ through laminar flow and coils into coiled sheet after rolling.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899612A (en) * | 2010-07-13 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | Non-tempered steel pipe and preparation method thereof |
| CN102703838A (en) * | 2012-05-28 | 2012-10-03 | 无锡西姆莱斯石油专用管制造有限公司 | Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes |
| CN102787269A (en) * | 2012-08-03 | 2012-11-21 | 中国石油集团渤海石油装备制造有限公司 | Method for manufacturing HFW (High Frequency Welding) oil casing by K55-grade steel plate |
| CN103509996A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 400 MPa-tensile-strength high-strength carbon-manganese constructional steel and manufacturing method thereof |
| CN107675076A (en) * | 2017-09-21 | 2018-02-09 | 上海宝钢包装钢带有限公司 | A kind of high-intensity packing steel band and its processing method |
-
2006
- 2006-05-29 CN CNB2006100270218A patent/CN100507050C/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899612A (en) * | 2010-07-13 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | Non-tempered steel pipe and preparation method thereof |
| CN101899612B (en) * | 2010-07-13 | 2012-09-19 | 攀钢集团钢铁钒钛股份有限公司 | Non-tempered steel pipe and preparation method thereof |
| CN102703838A (en) * | 2012-05-28 | 2012-10-03 | 无锡西姆莱斯石油专用管制造有限公司 | Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes |
| CN102703838B (en) * | 2012-05-28 | 2014-01-22 | 无锡西姆莱斯石油专用管制造有限公司 | Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes |
| CN102787269A (en) * | 2012-08-03 | 2012-11-21 | 中国石油集团渤海石油装备制造有限公司 | Method for manufacturing HFW (High Frequency Welding) oil casing by K55-grade steel plate |
| CN102787269B (en) * | 2012-08-03 | 2014-10-22 | 中国石油集团渤海石油装备制造有限公司 | Method for manufacturing HFW (High Frequency Welding) oil casing by K55-grade steel plate |
| CN103509996A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 400 MPa-tensile-strength high-strength carbon-manganese constructional steel and manufacturing method thereof |
| CN103509996B (en) * | 2013-09-25 | 2016-01-20 | 马钢(集团)控股有限公司 | The manufacture method of tensile strength 400MPa grade high-strength carbon manganese structure iron |
| CN107675076A (en) * | 2017-09-21 | 2018-02-09 | 上海宝钢包装钢带有限公司 | A kind of high-intensity packing steel band and its processing method |
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| CN100507050C (en) | 2009-07-01 |
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