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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.

API 5L STEEL PIPE

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