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Tianjin Lefin Industrial Co.,Ltd
Tianjin Lefin Industrial Co.,Ltd

Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard

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Tianjin Lefin Industrial Co.,Ltd.
Tianjin Lefin Industrial Co.,Ltd.

Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard

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OEM&ODM

Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.

API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE
API 5L STEEL PIPE

Singapore API 5L STEEL PIPE

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SingaporeSTEEL HOLLOW SECTIONS

+86 22 58171905

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Product Description

Brief Introduction

 

API 5L STEEL PIPE

Standard: API 5L

The Wall Thickness Tolerance: ±5%

Length: normally 5.8m, 6m, 12m or as your required

Surface Treatment: Bare Finish, Painting, Oiling, Galvanzation, 3PE, FBE coated......

 

1. API 5L standard overview

- Formulation body: American Petroleum Institute (API)

- Applicable fields: oil and gas pipelines (onshore and subsea), hydraulic engineering and other fluid transportation.

- Latest version: API Specification 5L (2020 version), international general, China GB/T 9711 corresponding.

 

2. Common steel pipe types

Straight seam welded pipe, LSAW, steel plate welded into pipe. High precision, suitable for high pressure pipelines.

Spiral welded pipe, SSAW, spiral coil welding of steel strip. Low cost, large diameter suitable.

 

3. Dimensions and specifications

- Outer diameter range: 4.25" (108 mm) to 48" (1219 mm)

- Wall thickness: Sch40s to Sch160s (US standard), corresponding to the national standard DN150 to DN1200.

- Standard length: 12 m (40 ft) or on demand.

 

4. Key production requirements

- Chemical composition: Control carbon equivalent (Ceq) to prevent brittleness

- Mechanical properties: tensile strength (≥485 MPa), yield strength (≥370 MPa), impact toughness.

 

Test standard:

- Hydraulic test (API 5L Section 9)

- Non-destructive testing (UT/RT/RM)

- Weld heat treatment (if necessary)

Chemical Composition

Grade

Seamless pipe and welded pipe

Yield strength
Rt0,5
MPa(psi)

Tensile strength
Rm
Mpa(psi)

Yield ratio
Rt0,5/Rm

MIN

MAX

MIN

MAX

MAX

L245R/BR 
L245N/BN 
L245Q/BQ
L245M/BM

245
(35,500)

450
(65,300)

415
(60,200)

655 
(95,000)

0.93

L290R/X42R
L290N/X42N
L290Q/X42Q
L290M/X42M

290
(42,100)

495
(71,800)

415
(60,200)

 

0.93

L320N/X46N
L320Q/X46Q
L320M/X46M

320
(46,400)

525
(76,100)

435
(63,100)

655
(95,000)

0.93

L360N/X52N
L360Q/X52Q
L360M/X52M

360
(52,200)

530
(76,900)

460
(66,700)

760
(110,200)

0.93

L390N/X56N
L390Q/X56Q
L390M/X56M

390
(56,600)

545
(79,000)

490
(71,100)

760
(110,200)

0.93

L415N/X60N
L415Q/X60Q
L415M/X60M

415
(60,200)

565
(81,900)

520
(75,400)

760
(110,200)

0.93

L450Q/X65Q
L450M/X65M

450
(65,300)

600
(87,000)

535
(77,600)

760
(110,200)

0.93

L485Q/X70Q
L485M/X70M

485
(70,300)

635
(92,100)

570
(82,700)

760
(110,200)

0.93

L555Q/X80Q
L555M/X80M

555
(80,500)

705
(102,300)

625
(90,600)

825
(119,700)

0.93

L625M/X90M

625
(90,600)

775
(112,400)

695
(100,800)

915
(132,700)

0.95

L625Q/X90Q

625
(90,600)

775
(112,400)

695
(100,800)

915
(132,700)

0.97g

L690M/X100M

690b(100,100)b

840b(121,800)b

760
(110,200)

990
(143,600)

0.97h

L690Q/X100Q

690b(100,100)b

840b(121,800)b

760
(110,200)

990
(143,600)

0.97h

L830M/X120M

830b(120,400)b

1050b(152,300)b

915
(132,700)

1145
(166,100)

0.99h

b. For grades > L625 or X90, Rp0.2 applies.
g. Lower values of Rt0.5/Rm may be specified by agreement.
h. For grades > L625 or X90, Rp0.2 /Rm applies. Lower values of Rp0.2 /Rm may be specified by agreement.

 

​

Physical requirements

Grade

Chemical composition analysis of psl2 steel pipe t≤25mm

Cb

Si

Mn

P

S

Seamless pipe and welded pipe

L245R/BR

0.24 

0.40 

1.20 

0.025 

0.015 

L290R/X42R

0.24 

0.40 

1.20 

0.025 

0.015 

L245N/BN

0.24 

0.40 

1.20 

0.025 

0.015 

L290N/X42N

0.24 

0.40 

1.20 

0.025 

0.015 

L320N/X46N

0.24 

0.40 

1.40 

0.025 

0.015 

L360N/X52N

0.24 

0.45 

1.40 

0.025 

0.015 

L390N/X56N

0.24 

0.45 

1.40 

0.025 

0.015 

L415N/X60N

0.24f

0.45 

1.40f

0.025 

0.015 

L245Q/BQ

0.18 

0.45f

1.40 

0.025 

0.015 

L290Q/X42Q

0.18 

0.45 

1.40 

0.025 

0.015 

L320Q/X46Q

0.18 

0.45 

1.40 

0.025 

0.015 

L360Q/X52Q

0.18 

0.45 

1.50 

0.025 

0.015 

L390Q/X56Q

0.18 

0.45 

1.50 

0.025 

0.015 

L415Q/X60Q

0.18f

0.45f

1.70f

0.025 

0.015 

L450Q/X65Q

0.18f

0.45f

1.70f

0.025 

0.015 

L485Q/X70Q

0.18f

0.45f

1.80f

0.025 

0.015 

L555Q/X80Q

0.18f

0.45f

1.90f

0.025 

0.015 

L625Q/X90Q

0.16f

0.45f

1.90 

0.020 

0.010 

L690Q/X100Q

0.16f

0.45f

1.90 

0.020 

0.010 

welded pipe

L245M/BM

0.22 

0.45 

1.20 

0.025 

0.015 

L290M/X42M

0.22 

0.45 

1.30 

0.025 

0.015 

L320M/X46M

0.22 

0.45 

1.30 

0.025 

0.015 

L360M/X52M

0.22 

0.45 

1.40 

0.025 

0.015 

L390M/X56M

0.22 

0.45 

1.40 

0.025 

0.015 

L415M/X60M

0.12f

0.45f

1.60f

0.025 

0.015 

L450M/X65M

0.12f

0.45f

1.60f

0.025 

0.015 

L485M/X70M

0.12f

0.45f

1.70f

0.025 

0.015 

L555M/X80M

0.12f

0.45f

1.85f

0.025 

0.015 

L625M/X90M

0.10 

0.55f

2.10f

0.020 

0.010 

L690M/X100M

0.10 

0.55f

2.10f

0.020 

0.010 

L830M/X120M

0.10 

0.55f

2.10f

0.020 

0.010 

f.Unless otherwise agreed.

 

​

 

 

Applications

 

Specific application scenarios for API 5L STEEL PIPE include:

 

1. Offshore oil platform construction

Used in the construction of offshore oil platforms such as Greece, X70 steel grade straight seam submerged arc welded pipe (LSAW) is used to support the platform structure.

 

2. Long distance oil and gas pipeline system

It is widely used in medium and low pressure transportation of oil and natural gas, covering complex environment from land to seabed. For example, different steel grades such as X42 to X80 can meet different pressure and temperature requirements (e.g. X65 is often used in LNG projects).

 

3. High pressure pipeline

API 5L steel tubes of high steel grade (e.g. X80) are used in high-pressure oil and gas transportation, such as transcontinental pipelines or deep sea oil and gas field development, requiring strict non-destructive testing (e.g. UT/RT) to ensure safety.

 

4. Special environmental engineering

- Acidic environment: sulfur resistant steel (such as C110) should be used and marked with an "S" suffix.

- Low temperature scenario: Steel grade X65/X70 is suitable for gas transmission in extremely cold areas.

- Marine service: Steel pipes marked with the suffix "O" meet API 17D enhanced standards for offshore platform piping.

 

5. Municipal and industrial pipelines

Some specifications (such as J55/N80) are also used in municipal water supply, gas pipelines and boiler systems, but attention should be paid to the distinction with structural steel pipes.

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