LSAW STEEL PIPE

2 year ago

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Hydrogrand Steel Pipe Co.,ltd

 3 year year

Product details

UOE, COE, and JCOE are different manufacturing processes used for producing large-diameter LSAW steel pipes.

UOE (Uing and Oing Process): UOE is an abbreviation for Uing and Oing. In this process, a steel plate is first formed into a U shape (Uing) and then pressed and expanded to an O shape (Oing) using a mechanical or hydraulic press. The UOE process allows for the production of high-quality, longitudinally welded pipes with excellent dimensional accuracy and a wide range of sizes. UOE pipes are commonly used in oil and gas transmission pipelines.

COE (Crescent Oing Process): COE, also known as the Crescent Oing process, involves forming a steel plate into a C shape and then expanding it to an O shape. This process is suitable for producing large-diameter pipes with thick walls. COE pipes are characterized by their strong resistance to axial loads and are commonly used in offshore and structural applications.

JCOE (Jing, Cing, Oing, Expanding Process): JCOE is a manufacturing process that combines several steps - Jing (forming a steel plate into a J shape), Cing (forming it into a C shape), Oing (expanding it to an O shape), and Expanding (further expanding the pipe diameter). JCOE process allows for the production of high-strength and thick-walled pipes, making it suitable for various applications including oil and gas transportation, structural projects, and offshore platforms.

STANDARD OF LSAW STEEL PIPE

Standard	Grade	Chemical Composition(%)				Tensile STrength(min)	Yield Strength(min)
Standard	Grade	C Mn P S				Mpa	Mpa
API 5L PSL1	A	0.22	0.90	0.030	0.030	335	210
	B	0.28	1.20	0.030	0.030	415	245
	X42	0.28	1.30	0.030	0.030	415	290
	X46	0.28	1.40	0.030	0.030	435	320
	X52	0.28	1. 40	0.030	0.030	460	360
	X56	0.28	1.40	0.030	0.030	490	390
	X60	0.28	1.40	0.030	0.030	520	415
	X65	0.28	1.40	0.030	0.030	535	450
	X70	0.28	1.40	0.030	0.030	570	485
Standard	Grade	Chemical Composition(%)				Tensile STrength	Yield Strength
Standard	Grade	C Mn P S				Mpa	Mpa
API 5L PSL2	B	0.24	1.20	0.025	0.015	415-655	245-450
	X42	0.24	1.30	0.025	0.015	415-655	290-495
	X46	0.24	1.40	0.025	0.015	435-655	320-525
	X52	0.24	1. 40	0.025	0.015	460-760	360-530
	X56	0.24	1. 40	0.025	0.015	490-760	390-545
	X60	0.24	1. 40	0.025	0.015	520-760	415-565
	X65	0.24	1.40	0.025	0.015	535-760	450-600
	X70	0.24	1.40	0.025	0.015	570-760	485-635
	X80	0.24	1. 40	0.025	0.015	625-825	555-705

PSL 1 VS. PSL 2 SPEC SHEET

	PSL 1	PSL 2
Grade range	A25 through X70	GR B through X80	Table 1
Size range	0.405 through 80	4-2/1 through 80	Table 1
Type of pipe ends	Plain-end, threaded-end, bevelled-end, special coupling pipe	Plain-end	Table 1
Seam welding	All methods continous welding limited to Grade A25	All methods except continous and laser welding	Table 1
Electric welds: welder frequency	No minimum	100 kHz minimum	5.1.3.3.2
Heat treatments of electric welds	Required for grades > X42	Required for all grades (GR B through X80)	5.1.3.3.1; J.3.3.2:6.2.7
Chemistry: max C for seamless pipe	0.28% for grades > Gr B	0.24%	Tables 2A, 2B
Chemistry: max C for welded pipe	0.26% for grades > Gr B	0.22%	Tables 2A, 2B
Chemistry: max P	0.03%	0.03%	Tables 2A, 2B
Chemistry: max S	Only when purchases specifies SR18	0.02%	Tables 2A, 2B
Carbon equivalent	None	Maximum required for each grade	4.2:4.3:6.1.3: SR15.1
Yield strength, maximum	None	Maximum for each grade	Tables 3A, 3B
UTS, maximum	None required	Maximum for each grade	Tables 3A, 3B
Fracture toughness	Only when purchaser specifies SR4	Required for all grades	6.2.6; 9.3.5: 9.8.4; 9.10.7;
Non-destructive inspection of seamless pipes	Permitted	SR4 mandatory	Table 14 9.7.2.6
Repare by welding of pipe body, plate and skelp	Permitted by agreement	Prohibited	5.3.2;9.7.6: B.1;B.2
Certification	Certificates when specified per SR15	Prohibited	4.3;9.7.4.4;9.7.6;B.1.2;B.4
Traceability	Traceable only until all tests are passed unless SR15 is specified	Certificates (SR15.1) mandatory Traceable after completion of tests (SR15.2) mandatory	12.1 5.6

Difference between SSAW steel pipe and LSAW steel pipe

1. Different pressure-bearing capacity

The strength of spiral steel pipes is generally higher than that of straight seam steel pipes. The main production process is submerged arc welding. Spiral steel pipes can use blanks of the same width to produce steel pipes with different pipe diameters, and can also use narrower blanks to produce steel pipes with larger pipe diameters.

2. Different specifications

The specifications of spiral steel pipes are generally above 219mm, and most of them are of large diameter. The specifications of straight seam steel pipes are mostly of small diameter, but some manufacturers also have many large diameters.

3. Different prices

Spiral steel pipes are mostly settled by measuring rulers, and the price of straight seam steel pipes is mostly settled by weighing, but the price of spiral steel pipe is about 300 yuan/ton cheaper than that of straight seam steel pipe.

You could choose the suitable steel pipes according to your requirement.

Hunan Hydrogrand Steel Pipe could supply all the kinds of best pipe for you.