CN103266282A - L415MB steel grade high frequency longitudinal welded pipe and manufacturing method thereof - Google Patents
L415MB steel grade high frequency longitudinal welded pipe and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an L415MB steel grade high frequency longitudinal welded pipe and a manufacturing method thereof. The L415MB steel grade high frequency longitudinal welded pipe contains the chemical ingredients in percentage by weight: 0.05-0.1% of C, 0.15-0.3% of Si, 1-1.4% of Mn, 0.005-0.015% of P, 0.0006-0.015% of S, not larger than 0.05% of Ti, 0.001-0.032% of V, 0.015-0.04% of Al, 0.006-0.02% of Ni, 0.005-0.028% of Nb, 0.006-0.016% of Cu, not larger than 0.03% of Cr, 0.004-0.18% of Mo, not larger than 0.004% of B, not larger than 0.008% of Ca, and the balance of Fe and inevitable impurities. According to the L415MB steel grade high frequency longitudinal welded pipe disclosed by the invention, the yield strength of a pipe body is 415-565MPa; the tensile strength is larger than 520MPa, the ductility is 30-42%, the yield ratio is not larger than 0.93, the Charpy impact energy bulk sample unit value is not smaller than 30J, the mean value of the Charpy impact energy bulk sample unit value is not smaller than 40J, the weld tensile strength is not smaller than 520MPa, and the weld tissues are pearlite and ferrite.
Description
Technical field
The invention belongs to the HFW high-frequency straight seam welded pipe and make the field, be specifically related to a kind of L415MB grade of steel high-frequency straight seam welded pipe and manufacture method thereof, this high-frequency straight seam welded pipe body wall thickness 4mm～20mm, external diameter is 114mm～630mm; Body yield strength 415～565MPa; More than the tensile strength 520MPa, unit elongation 30%～42%, yield tensile ratio is not more than 0.93; Impelling strength Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; The weld seam tensile strength of this high-frequency straight seam welded pipe is not less than 520MPa, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; Seam organization is perlite and ferrite.
Background technology
In the world oil gas production with in carrying, the HFW high-frequency straight seam welded pipe obtains widespread use with advantages such as its low cost of manufacture, dimensional precision height, the easy controls of specified length, be mainly used in oil, the Sweet natural gas in land, seabed, the conveying of ore pulp, have a extensive future.There is the above HFW high-frequency straight seam welded pipe unit of hundreds of cover external diameter 114mm in China at present, and domestic most of producers mainly produce conventional grade of steel steel pipe, for the production of the above grade of steel steel pipe of L415MB, also do not produce in enormous quantities.
At present in the L415MB grade of steel high-frequency straight seam welded pipe of producing, when carrying out the composition design of welded tube, the control of C content can surpass 0.1%, maximum can reach 0.16%, the higher consequence that causes of carbon content is, body impelling strength can descend, too high carbon content might cause body impelling strength not satisfy the requirement of standard Charpy-V impact power 30J, can cause the rolling center segregation of steel band simultaneously, influences quality product, and after carrying out weld seam thermal treatment, carbon content is more high, and weld seam more is easy to generate martensite, and martensitic existence causes welded seam area hardness too high, overproof requirement, the toughness in steel pipe seam zone sharply descends simultaneously.
Mn content is lower than 1.0%, and the surrender behind the tubulation, tensile strength may be not enough, and Mn content is higher than 1.4%, and the surrender behind the tubulation, tensile strength may exceed standard, and do not satisfy the requirement of L415MB grade of steel.
P, S content can not exceed standard, at present in the technology to the content requirement of P below 0.025%, the content requirement of S is below 0.02%, when P, S too high levels, crackle appears in sheet material easily, influences the tubulation quality.
Ratio-frequency welded tube technology in the past, the angle that ratio-frequency welded tube is produced not, speed, technologies such as thermal treatment are made regulation, arbitrarily set these parameters, can cause steel pipe seam thermal treatment not saturating, can influence the impelling strength of weld seam, Charpy-V impact power bulk sample monodrome can not satisfy the requirement of minimum standard less than 30J, causes welded tube welding property instability, such as existing welding to be mingled with, cold welding, toughness does not meet the demands, and makes quality product have hidden danger.
Summary of the invention
The object of the invention is to provide a kind of L415MB grade of steel high-frequency straight seam welded pipe and manufacture method thereof, this high-frequency straight seam welded pipe body wall thickness 4mm～20mm, and external diameter is 114mm～630mm; Body yield strength 415～565MPa; More than the tensile strength 520MPa, unit elongation 30%～42%, yield tensile ratio is not more than 0.93; Impelling strength Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; The weld seam tensile strength of this high-frequency straight seam welded pipe is not less than 520MPa, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J.
For achieving the above object technical scheme of the present invention:
A kind of L415MB grade of steel high-frequency straight seam welded pipe, its chemical component weight per-cent is: C:0.05～0.1%; Si:0.15～0.3%; Mn:1.0～1.4%; P:0.005～0.015%; S:0.0006～0.006%; Ti :≤0.05%; V:0.001～0.032%; Al:0.015～0.04%; Ni:0.006～0.02%; Nb:0.005～0.028%; Cu:0.006～0.016%; Cr :≤0.03%; Mo:0.004～0.18%; B :≤0.004%; Ca :≤0.008%; All the other are Fe and unavoidable impurities; This high-frequency straight seam welded pipe body wall thickness 4mm～20mm, external diameter is 114mm～630mm; Body yield strength 415～565MPa; More than the tensile strength 520MPa, unit elongation 30%～42%, yield tensile ratio is not more than 0.93; Impelling strength Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; The weld seam tensile strength of this high-frequency straight seam welded pipe is not less than 520MPa, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; Seam organization is perlite and ferrite.
In composition design of the present invention:
Carbon, content control is 0.05～0.1%, seam organization changes ferrite and perlite into after 930-960 ℃ of intermediate frequency simulation normalizing thermal treatment, if press greatest carbon content 0.16% control of standard-required, weld seam is after intermediate frequency simulation normalizing thermal treatment, perlite can become big relatively, the whole grain size number of tissue is descended, the probability increase that the increase of carbon content simultaneously also can make martensite in the seam organization or horse island difficult to understand tissue exist, be not allow to exist untempered martensite in the standard, in our the ratio-frequency welded tube industry generally all is normalizing process, there is not tempering unit, cannot eliminate this sclerotic tissue, so the control of carbon content will be in conjunction with the intermediate frequency simulation normalizing treatment production technology at scene, carbon content will be hanged down and be guaranteed that it does not produce martensite and horse island difficult to understand in intermediate frequency simulation normalizing thermal treatment, guarantee that the hardness of steel pipe and toughness are all in standard range, the existence on martensite and horse island difficult to understand, can reduce the corrosion resistant ability of steel pipe, steel pipe is stacked for a long time, and martensite and horse island difficult to understand at first produces the rust hole where.Carbon content is low except the toughness that can improve steel pipe, also can improve the atmospheric corrosion resistance ability of steel.
Mn, content is controlled 1.0～1.4%, is lower than the Mn content maximum 1.6% of standard-required, and other producers are by 1.55% control, can make the yield strength of the coil of strip scope that is above standard; Also have producer to use Mn content to be lower than 1.0%, the surrender of the steel pipe behind the tubulation so, tensile strength may be lower than standard-required.In conjunction with on-the-spot intermediate frequency simulation normalizing treatment production technology, from the tissue of steel pipe seam, Mn content is higher than 1.4% in the coil of strip, increases Mn content, can promote the formation on horse island difficult to understand, causes increase and the strengthening effect of hardening capacity.
When P, S too high levels, crackle appears in sheet material easily, influences the tubulation quality, and low P, S content can be avoided the generation of sheet material crackle, so P, S content can not exceed standard, P content is controlled below 0.015%, and S content is controlled below 0.015%.
The manufacture method of L415MB grade of steel high-frequency straight seam welded pipe of the present invention comprises the steps:
1) coiled sheet butt welding: with the coil of strip uncoiling of above-mentioned chemical ingredients, adopt the consumable electrode carbon dioxide-shielded welding that the volume head of the end of reel of last volume and back one volume is welded as steel band;
2) mill the limit: the edges of boards of steel band adopt and mill the limit method, accurately control width of steel band and side orthogonality;
3) moulding: adopt the row-roll forming process method that steel band is shaped to hollow forging;
4) high frequency vertical masonry joint welding: welding frequency is 100KHz～400KHz, and amount of compression 〉=T/2, T are thickness of strips, unit: mm; Angular aperture control is at 3～5 °, and welding speed is 8～30m/min;
5) thermal treatment: the postwelding weld seam carries out intermediate frequency simulation normalizing thermal treatment under 930～960 ℃ of conditions, below the air cooling to 400 ℃, spraying water is cooled to below 50 ℃ again, finally obtains described high-frequency straight seam welded pipe after the normalizing, its wall thickness 4mm～20mm, external diameter are 114mm～630mm; The body yield strength is 415～565MPa; Tensile strength is more than 520MPa, and yield tensile ratio is not more than 0.93, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; The weld seam tensile strength of this high-frequency straight seam welded pipe is not less than 520MPa, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; Seam organization is perlite and ferrite.
In manufacture method of the present invention:
Coiled sheet butt welding operation adopts CO 2 gas-shielded gas metal-arc welding that the volume head of the end of reel of last volume and back one volume is welded as steel band, guarantees the quality of connection of the end of reel and volume head.
Coiled sheet butt welding operation needs head and afterbody excision with the raw material coil of strip after the coil of strip uncoiling, form concordant and and the coil of strip horizontal direction be the otch of an angle.
Adopt rational moulding process to guarantee the edges of boards butt joint, for hight frequency welding provides good limit portion condition, improve the ductility of edges of boards, the moulding of limit portion is abundant.
The hight frequency welding operation is adjusted the output rating of radio-frequency induction coil, and whether steel band limit portion fully melted and be as the criterion when power setting was seen welding, and welding frequency is 100KHz～400KHz.
Amount of compression 〉=T/2, T are thickness of strips, unit: mm; Many steel pipes producer unit insufficient strength, amount of compression control are by less than T/2 control, and the butt welded seam quality has been brought influence, is easy to generate weld seam and is mingled with, and weld properties is not up to standard, does not satisfy the requirement of standard.
Angular aperture control is at 3～5 °, and a lot of steel pipe producers do not recognize the control of angular aperture, and the producer that has is by controlling less than 3 degree, and the easy like this generation that causes welding seam misalignment forms useless pipe in batches, has reduced the product income, and the while weld seam is easy to generate inclusion.When angular aperture is spent greater than 5, produce same steel pipe, bonding power need increase considerably, and causes current consumption to increase, and has increased the cost of product.When welding, welding speed V is 8～30m/min, and welding speed suggestion is not less than 8m/min, otherwise the probability that weld seam is mingled with can increase, and is unfavorable for the control of steel pipe seam quality;
Intermediate frequency simulation normalizing thermal treatment is carried out in thermal treatment, postwelding weld seam under 930～960 ℃ of conditions, make the interior appearance temperature of high-frequency straight welded pipe welding-seam reach austenitizing temperature, makes the commissure organize complete austenitizing; Intermediate frequency simulation thermal treatment temp is set at 930～960 ℃, be because intermediate frequency simulation normalizing thermal treatment can only normalizing in steel tube surface, temperature is delivered to the steel pipe inwall can decay 30～50 ℃, wall thickness is more thick, the decay of temperature is more many, and is thorough in order to ensure the austenitic transformation of weld seam inside wall thickness.
The present invention simulates the normalizing thermal treatment temp with intermediate frequency and is set at 930～960 ℃.The enterprise's intermediate frequency simulation normalizing thermal treatment temp that has is set at 900 ℃, and this is unscientific, and the steel pipe outside is austenitic transformation, but the steel pipe inwall is because temperature is low excessively, can not satisfy austenite and fully change, it is thick to make the steel duct tissue organize than outside surface, and the toughness of steel pipe inwall descends.If surpass more than 960 degree, because overheated, austenite structure is thick, very fast cooling back forms Widmannstatten structure, in conjunction with the steel pipe composition, and the more high Widmannstatten structure that more is easy to generate of carbon content, the steel pipe seam zone, toughness sharply descends, so we also control carbon content.Weld seam slowly is cooled to below 400 ℃ in air, and making the commissure structural transformation is perlite and ferrite, and makes grain refining, the cooling of spraying water again, and weld seam temperature is down to below 50 ℃.
Welding speed and wall thickness, intermediate frequency simulation normalizing thermal treatment three is complementary, wall thickness is more thick, during intermediate frequency simulation normalizing thermal treatment, it is long that the temperature of wall thickness reaches time of design temperature in the steel pipe, so welding speed must reduce, and wall thickness is more thin, the temperature of wall thickness reaches the time weak point of design temperature in the steel pipe, and welding speed can be accelerated.
Beneficial effect of the present invention:
L415MB grade of steel high-frequency straight seam welded pipe of the present invention and manufacture method thereof, make intermediate frequency simulation normalizing thermal treatment by composition design control C content after seam organization change ferrite and perlite into, guarantee that hardness and the toughness of welded tube can both reach above-mentioned performance requriements; Control Mn content makes the intensity of coil of strip reach above-mentioned performance requriements; Control P, S content can be avoided the generation of sheet material crackle.
Improvement according to the composition design correspondingly arranges the ruhmkorff coil output rating, power setting with when welding steel band limit portion whether fully melt and be as the criterion, select welding speed at 8～30m/min according to wall thickness range, with the bonding power coupling, impel weld seam temperature to reach effective welded condition; Select 930～960 ℃ intermediate frequency simulation normalizing thermal treatment temp, make the interior appearance temperature of high-frequency straight welded pipe welding-seam reach austenitizing temperature, make the commissure organize complete austenitizing, make weld seam slowly cooling in air after the normalizing, making the commissure structural transformation is perlite and ferrite, and make grain refining, and overcome prior art and produced the shortcoming that L415MB grade of steel high-frequency straight welded pipe welding-seam performance is difficult to guarantee, formed the coupling of manufacturing process technology and composition design.Obtain having the high-frequency straight seam welded pipe of higher tensile property, toughness and welding property, can be used for the conveying of industrial gas oil PetroChina Company Limited., Sweet natural gas and processed oil in a large number.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
Embodiment of the invention high-frequency straight seam welded pipe chemical ingredients is referring to table 1, and table 2 is the concrete processing parameter of embodiment of the invention manufacture method, and table 3 is the performance of embodiment of the invention high-frequency straight seam welded pipe.
Wherein, the specimen size of Charpy-V impact power is 6.67mm * 10mm * 55mm among the embodiment 1,4, and the specimen size of Charpy-V impact power is 5mm * 10mm * 55mm among the embodiment 2,5, and the specimen size of Charpy-V impact power is 10mm * 10mm * 55mm among the embodiment 3.
As can be seen from Table 3, the L415MB grade of steel high-frequency straight seam welded pipe of producing with the designed chemical ingredients of the present invention and manufacture method has good tensile property, toughness and welding property, and body wall thickness 4mm～20mm, external diameter are 114mm～630mm; Body yield strength 415～565MPa; More than the tensile strength 520MPa, unit elongation 30%～42%, yield tensile ratio is not more than 0.93; Impelling strength Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; The weld seam tensile strength of this high-frequency straight seam welded pipe is not less than 520MPa, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; Seam organization is perlite and ferrite.
In sum, L415MB grade of steel high-frequency straight seam welded pipe of the present invention is by adopting rational composition design, and production technique has been made concrete parameter stipulated, especially welding speed and wall thickness, the coupling of intermediate frequency simulation normalizing thermal treatment three processing parameter, make that the steel tube performance of producing is stable, steel pipe can obtain good macrostructure, good mechanical performance.
Table 1 unit: weight percent
| Embodiment | C | Si | Mn | P | S | Ti | V | Al | Ni | Nb | Cu | Cr | Mo | B | Ca |
| 1 | 0.0759 | 0.202 | 1.303 | 0.0107 | 0.0048 | 0.017 | 0.007 | 0.031 | 0.006 | 0.022 | 0.010 | 0.030 | 0.010 | 0.0003 | 0.0027 |
| 2 | 0.0686 | 0.150 | 1.24 | 0.0133 | 0.0033 | 0.027 | 0.020 | 0.026 | 0.010 | 0.017 | 0.013 | 0.023 | 0.105 | 0.0033 | 0.0051 |
| 3 | 0.0732 | 0.190 | 1.30 | 0.0093 | 0.0026 | 0.037 | 0.028 | 0.034 | 0.007 | 0.025 | 0.015 | 0.012 | 0.004 | 0.0015 | 0.0017 |
| 4 | 0.0572 | 0.230 | 1.35 | 0.0087 | 0.0029 | 0.012 | 0.017 | 0.020 | 0.009 | 0.015 | 0.012 | 0.020 | 0.070 | 0.0024 | 0.0023 |
| 5 | 0.0900 | 0.271 | 1.17 | 0.0076 | 0.0031 | 0.045 | 0.012 | 0.0171 | 0.016 | 0.008 | 0.007 | 0.014 | 0.170 | 0.0013 | 0.0065 |
Table 2
Table 3
Claims (3)
1. L415MB grade of steel high-frequency straight seam welded pipe, its chemical component weight per-cent is: C:0.05～0.1%; Si:0.15～0.3%; Mn:1.0～1.4%; P:0.005～0.015%; S:0.0006～0.006%; Ti≤0.05%; V:0.001～0.032%; Al:0.015～0.04%; Ni:0.006～0.02%; Nb:0.005～0.028%; Cu:0.006～0.016%; Cr≤0.03%; Mo:0.004～0.18%; B≤0.004%; Ca≤0.008%; All the other are Fe and unavoidable impurities; This high-frequency straight seam welded pipe wall thickness is 4mm～20mm, and external diameter is 114mm～630mm, and the body yield strength is 415～565MPa; Tensile strength more than 520MPa, unit elongation 30%～42%, yield tensile ratio is not more than 0.93, Charpy-V impact power bulk sample monodrome is not less than 30J, average is not less than 40J; The weld seam tensile strength of high-frequency straight seam welded pipe is not less than 520MPa, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; Seam organization is perlite and ferrite.
2. the manufacture method of L415MB grade of steel high-frequency straight seam welded pipe as claimed in claim 1 may further comprise the steps:
1) coiled sheet butt welding: with the coil of strip uncoiling of above-mentioned chemical ingredients, and the volume head that the end of reel and the back one of last volume are rolled up is welded as steel band;
2) mill the limit: the edges of boards of steel band adopt and mill the limit method, accurately control width of steel band and side orthogonality;
3) moulding: adopt the row-roll forming process method that steel band is shaped to hollow forging;
4) high frequency vertical masonry joint welding: welding frequency is 100KHz～400KHz, and amount of compression 〉=T/2, T are thickness of strips, unit: mm; Angular aperture control is at 3～5 °, and welding speed is 8～30m/min;
5) thermal treatment: the postwelding weld seam carries out intermediate frequency simulation normalizing thermal treatment under 930～960 ℃ of conditions, below the air cooling to 400 ℃, spraying water is cooled to below 50 ℃ again, finally obtains described high-frequency straight seam welded pipe after the normalizing, its wall thickness 4mm～20mm, external diameter are 114mm～630mm; The body yield strength is 415～565MPa; Tensile strength is more than 520MPa, and yield tensile ratio is not more than 0.93, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; The weld seam tensile strength of this high-frequency straight seam welded pipe is not less than 520MPa, and Charpy-V impact power bulk sample monodrome is not less than 30J, and average is not less than 40J; Seam organization is perlite and ferrite.
3. the manufacture method of L415MB grade of steel high-frequency straight seam welded pipe as claimed in claim 2 is characterized in that, the coiled sheet butt welding adopts the consumable electrode carbon dioxide-shielded welding that the volume head of the end of reel of last volume and back one volume is welded as steel band in the step 1).
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| CN110340512A (en) * | 2019-08-08 | 2019-10-18 | 中石化石油机械股份有限公司沙市钢管分公司 | A kind of contact weld technique of the big wall thickness H FW welded tube of X70M |
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