LSAW STEEL PIPE
2 year ago
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) |
|||
|
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 |
|||
|
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 |
12.1 |
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.
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