SA515360196B1 - High-frequency straight welded pipe and manufacturing method thereof - Google Patents

Abstract

The present invention discloses a high-frequency straight welded pipe. The high-frequency straight welded pipe comprises the following chemical elements percentages by mass: 0.042-0.056% of C, 0.18-0.22% of Si, 0.75-0.95% of Mn, 0.0064-0.015% of P, 0.0006-0.002% of S, 0.012-0.018% of Ti, 0.001-0.002% of V, 0.026-0.038% of Al, 0.080-0.13% of Ni, 0.020-0.029% of Nb, 0.125-0.135% of Cu, 0.018-0.03% of Cr, 0.004-0.008% of Mo, 0-0.0005% of B, 0.001-0.003% of Ca, and the balance of Fe and other inevitable impurities. Meanwhile, further disclosed is a manufacturing method for the high- frequency straight welded pipe.

Description

1 High-frequency straight welded pipe and its manufacturing method

High-frequency straight welded pipe and manufacturing method thereof Full description Background of the invention for its manufacture; In particular, the method and method of steel pipe The present invention relates to a steel pipe and a method for its manufacture. high frequency welded pipe with a high frequency welded pipe and natural gas Petroleum transportation production in the field of high frequency production frequency The cnatural 988© high frequency welded pipes are widely used thanks to their special advantages of (HFW) straight welded pipes high dimension alll, low manufacture cost, etc. specified. lengths at specified lengths control and control 07 on the ground ore slurry and they are mainly used to transport oil; natural gas; And raw slurry when used. It has a broad prospect and has a wide appreciation. Sea and under the sea, 0 1800, which is always growing on oil and natural gas; The global demand, in parallel with the global demand for oil and natural gas, is represented by wells in 010118400 conditions, conditions of exploitation that are distinguished by the environment, oil and gas fields, and more complex. and where sal high hydrogen oil and gas fields with badly corrosive environment steel pipe LWE and sulfur 5 contents are successfully developed; It is necessary for pipe makers Yo + suitable for transporting oil and natural gas under pipes to develop and produce pipes 65 and currently there is an acidic operation condition. This type of acidic operating condition is a high straight welded pipe sets of 100 iS groups in China. However; Most of the manufacturers have to buy plate volumes (HFW) frequency who produce steel pipes large steel makers from plate volumes Y. Basically. A factory does not produce conventional steel grades 5166© pipes

— As a local domestic plant, pipeline pipes series pipes resistant to crack (HIC) crack pas ell with higher steel grades as they have Sef superior properties that are eagerly required in the market market and to oY there still remains a domestic blank area for HIC-resistant grade 360/05 straight, high-frequency welded straight pipes and a process to manufacture it. General Description of the Invention The objective of the present invention relates to providing a straight welded pipe with frequency lle and a method for its manufacture; The high frequency straight welded pipe has das HIC resistance and properties of steel grade 0 9806 360//05A and high yield strength; high tensile strength; High impact toughness and good weldability. In order to achieve the previous objective of the invention; A straight welded pipe is provided, pill lle, as it includes the following chemical elements in mass percentages: percentages Yo Na 67 ...-1 ...96 YY= 1. VA: Si .+ %¢ ¢%+.90—+.Yo :Mn : 16....-96...15; a

— ¢ — that: ‎NY—v.

Av .+%¢ 01:Nb ...H...976; :Cu 70 1..-97662.170; : ml .97663 gt : Mo 5 ....-m ... 962 O— :B f f rv, v 9%« 1 Ca ...7 + %¢ and balance Balance between Fe and other unavoidable impurities. The main chemical elements in a straight, high-frequency Vo welded pipe of the invention are designed according to the following 000010165 bases: C: Carbon is the main solid solution strengthening element in a pipe Pipeline pipe A good number of experiments conducted by researchers show that the sensitivity of strip steel increases to hydrogen induced crack (HIC) 1 The higher the carbon content in the bar steel. Thus; It is necessary 6 strip steel. and the carbon content of the composition of the invention is suitably reduced; of approximately 100.097 by weight as it is generally used in the former field by not more than 960.087 by weight. and like that; The carbon in the technical solution 00 of the invention is controlled in the range of 0.0647 -0..0971 916 by weight. 5: In dow sulfur steel, the crack length ratio is reduced, and MNS appears at the fracture face, as it indicates that it can be

Control the generation of cracks effectively by reduction. 5 in strip steel. However; It is not necessary to reach a random reduction of sulfur content because cracks in strip steel cannot be completely avoided even if the sulfur content is reduced to a very low level. The inventors have carried out many experiments and found that when; The mass percentage of sulfur is controlled sulfur range of 67 vee Not only can the need for corrosion resistance be satisfied but Lad can be prevented cracking in strip steel 8: Calcium treatment has a significant effect on the resistance to hydrogen induced crack (HIC) of strip steel.In the technical solution of the invention, a masking amount of 0 calcium is added into the composition. CaS precipitated at final solidification position into spherical inclusions after rolling thus improving the HIG crack resistance of strip steel. Calcium content is determined by the sulfur content, and then the calcium content is controlled calcium in the technical solution of the invention in Blas of Yor Voie) by weight. CuVo: Among the variety of calloy elements, copper 000081 is the only element that is useful for resisting hydrogen induced cracking (HIG). When an amount of copper is added to pipeline steel, the sensitivity of The rift caused by hydrogen significantly. The main reason is that copper facilitates the formation of a passivation film that confines the invasion of hydrogen element 00 and thus inhibits hydrogen-induced crack formation. According to the technical solution of the invention; A copper lade is added to improve resistance to hydrogen-induced cracking (!1). Thus; The copper content is controlled within a range of Yor ATo— AYO by weight. Mn: The effect of manganese on the sensitivity of the pipe chain steel to crack caused by hydrogen is mainly based on the effect of manganese on the phase transition of the strip Yo steel. And if the manganese content exceeds 70100 by weight; Increased sensitivity to L

— a — to the hydrogen-induced rift J(HIC) and so; The manganese content in the technical solution of the invention is controlled within a range of dom hve 96 by weight. Accordingly; The invention also provides a method for manufacturing the former high-frequency straight welded pipe; It includes the following steps: In the shell forming step, the squeeze is controlled to be 7-7 of the outer diameter of the welded pipe. In the welding step, control is made. Welding speed in the range of meters per minute; In the post-welding heat treatment step, the 0 welding line is calibrated at 6 9976-47 °C; Then by air cooling to less than YA degree Celsius and water cooling to less than Av degree Celsius. Furthermore it; In the casing formation step of the method for manufacturing a high-frequency straight welded pipe according to the invention; The opening angle is controlled within a range of LEY in the technical solution of the invention; The measured squeeze before and after welding is controlled within the range of Yo = 9707-7 for the outside radius of the welded pipe; where compression refers to the difference between the perimeter of the shell before compression and the circumference after compression. and in Allah fused; The molten pool at the welding line is exposed to air and is subject to oxidation, where the product of the oxidation reaction is in close relationship with the chemical composition of the strip steel. From ead, YS requires a relatively large squeeze to be used to press the resulting product with a high melting point to the surface of the weld seam on the strip steel and remove it by deburring. If the pressing less than 967; Flaws will occur such as cold welding 000; So that the inclusions of the strip steel cannot be expelled to the surface of the seam for cremoval removal and the quality of the strip steel will be affected. L

The welding speed is determined in a range of Yom VA m/min for the following reason that the welding speed is generally inversely proportional to the welding power so that the rapid welding speed tends to be opposite to the ability to Inclusion expellability due to high welding power dle and large squeeze © which results in a low effect in expelling inclusions. Thus; Osea controls the welding speed in a range equal to Yom VA m/min according to the technical solution of the invention. According to a method for manufacturing a high-frequency straight welded pipe of the invention; On the basis of 00's use of a method for manufacturing high frequency straight (HFW) induction welding and a high frequency straight welded pipe, as it is compatible with the requirements of 0 resistance, tensile property, and impact toughness. And the microstructure is manufactured by reasonably regulating the pressing and formation process, specifying the variables of welding parameters and forming the high-frequency weld, and controlling the technical parameters of the subsequent heat treatment.subsequent heat treatment 1 Compared with the previous field; the high frequency straight welded pipe of the invention has HIC sua resistance, properties of steel grade (L360MCS), high yield strength, <high tensile strength, and impact toughness High impact toughness and good weldability; suitable for use as a transporting pipe 6 in a harsh operating environment where SH 0 contents are high or there is acidic corrosion Description 1 for my detail: Examples -1 A high-frequency straight welded pipe of the invention is manufactured in accordance with the following steps: L

A — — The head and tail portions of unrolled steel rolls were cut and the resulting cuts were cut at an angle of ℉°F proportional to the traverse direction of steel dolphins rolls 5166. The tail of the preceding steel dolphin was welded to the head of 1680 succeeding steel roll 0 with carbon dioxide shielded welding. The steel strip was used to manufacture a straight welded pipe. cl Alle where the 6 edge of the plate has been processed with edge milling to precisely control the width of the steel strip and the plumbness of the plate edge. The steel strip is formed into a shell by the .cage roll forming process and the compression is controlled within 0 range of 9067-7 for the outer radius of the welded pipe; The opening angle was controlled within the range of 4.7-7". The welding speed was controlled within the range of 0-18 µm/min during welding. After welding" the weld seam was calibrated at AY = a degress; then By air cooling to less than YA and water cooling to less than Av degree, the wall thickness of the high-frequency straight welded pipe obtained by the previous process was 1.4 mm-1.9 mm; 719.7 pipe diameter 1.4 mm-560 mm Table 1 shows the chemical compositions of high frequency straight welded pipes according to Examples Table 1-1 (the balance is Fe Fe and other inevitable impurities; % by weight) 1 AVY vor AVA AAT LAAT Mn m 6 vor) £9 Yor lg YY Yor 1 YA Yor ARI RR P L

[I 0 A [I Vo “Le A” Le VY “Le 0. 5 p vor VY vee VE vee V 8 vee V 8 vor VE Ti “Le the” Le [I [I the] [I the] “Le the V 0 YA vor YA A AR vor YT vee VY Al «YA vol A A NA NT . Ni .. A vo Y 0 eo YY NU th vee YY RAY Nb

Yo Ye 4 NY «+. YY4 TY Cu vor YA ve Vo vor YY vor YT vor YT vor YT Cr “Le «A “Le vg v,v 2 0 v,v 20 v,v 20 vw, 20 Mo v,v vO 0 [IR «Y ‏ and “LW” 0. OR) 3 8 [IR 1 0 [I 1 [I YY “Le “Ya” Le “Ya [IR YA Ca] Table ¥ shows detailed process parameters for manufacturing 8 2 b ahu b b mo od 3 aS El _ High-frequency straight welded pipes according to examples (Sm) table Y temperature oe calibration speed degree a b bar width | Enrichment of loved ones hes i or FE od a ul EN. And Tam B Jin Daija? }Al Thaham £0 Milling £0} pall Zaie Rased Ajer Al Malhameh 5 fa) FI? CT IE I A fot 5.2 0% 4 3 L 4+ vi vi ov 0 Le! OY EN wl JE toy

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IE A EC AMA L L CC Kasn BE A A AH AD B H L L The frequency of the invention Alle has the straight welded pipe F as shown in the table 0 and resistance ©ala. In particular; superior mechanical properties output >99? megapascal; And a tensile strength of 358 welded pipe body. It shows the body of the welded pipe

EVO The weld seam of the welded pipe shall have a tensile strength of YY > 4 MPa; and elongation > MPa” as it indicates that the high-frequency straight welded pipe as a whole meets the need and in view of the high tensile capability to high strength and possesses a high tensile capacity of 0 for the Charpy impact energy Charpy impact energy ; Charpy energy has joules; And where the VYVS line also has a minimum value of joules and an average value of <119 welded pipe; Where it indicates that V£0 joules and a mean value of TAS welding of the welded pipe is a minimum value and -weldability The high-frequency straight welded pipe has good toughness and weldability (CTR) and crack thickness rating (CLR) and crack length ratio ¢ (CSR) The crack sensitivity rating Vo of a strip steel material (HIC) that is used to evaluate resistance to hydrogen induced cracking as it shows good resistance oF as shown in Table 7600 5010 ; All steel material for high frequency straight welded pipe (HIC) for hydrogen induced crack L

-11- It is noted that the specific examples prior to the invention are illustrative only. Clearly, there are no variations (cll) limiting the invention to the previous examples. Other than all variations directly derived or fully contemplated from the disclosure of the invention by the protection scope a person skilled in the art must fall within a protection scope

Claims (1)

“yy Protection Elements.” 1. A high frequency straight welded pipe, which includes the following chemical elements in percentages by mass: percentages Na 467 ... - 96...0; ¢%+.YY-+ VA SI © ¢%+.40-+.Yo :Mn 476....-96...15; : 9766... A 5 :976...1; VY CTH Pe ve Yorn No 0 00 96... 72-... 73 Akh -96..17; 0 Ae immediately ..-976...74; 7 ND 17.J-96..178; © Cu Cr 10 Mal...-96...7; Da 4... ...97662 8: .-96.....8; Yorn) 8 ...976.2 and the balance of Fe with other unavoidable impurities. 01 high frequency straight welded a method for manufacturing a high frequency straight welded pipe.” Where: 0 According to Claim No. © 7067-7 of ©50; the press 50016628 is controlled to be forming step in step Configuration of the 'welded pipe' for the welded pipe, outer diameter of the outer radius b 1h In the welding step, the welding speed is controlled within a range of A (Yoo) meters/min; In the post-welding heat treatment step, the welding line is calibrated at 976-970 degrees Celsius, then by air cooling to © Less than YA ° C and water cooling to less than Av ° Jase Ly Method for manufacturing a high frequency straight welded pipe according to Claim No. 7; Where in the shell forming step, the opening angle Lad is controlled ranging from CENT B The validity period of this patent is twenty years from the date of filing the application, provided that the annual financial fee is paid for the patent and that it is not invalid or forfeited for violating any of the provisions of the patent system, layout designs of integrated circuits, plant varieties, and industrial designs, or its executive regulations issued by King Abdulaziz City for Science and Technology; Saudi Patent Office P.O. Box TAT Riyadh 57??11 ¢ Kingdom of Saudi Arabia Email: Patents @kacst.edu.sa