Description

API 5L Steel Pipe is a pipeline steel pipe. API 5L is a steel pipe standard for oil and gas pipeline transportation, mainly used for long-distance transportation of oil and natural gas. API 5L Steel Pipe puts forward strict requirements on the material, manufacturing process, size, tolerance, etc. of steel pipes.

API 5L Steel Pipes are divided into two categories: API 5L welded steel pipes and API 5L seamless steel pipes. API 5L seamless steel pipes are mainly used to withstand transportation needs in high pressure, high temperature and highly corrosive environments, while API 5L welded steel pipes are widely used in conventional environments and low-pressure pipelines. The production process, mechanical properties and applicable scenarios of the two are different.

Classification and characteristics of API 5L Steel Pipe:

The material of API 5L Steel Pipe is very similar to that of API 5CT steel pipes, but they differ in some details. For example, the X series (such as API 5L X42 Steel Pipe, API 5L X52 Steel Pipe, API 5L X65 Steel Pipe, API 5L X70 Steel Pipe, API 5L X80 Steel Tube, etc.) steel pipes in API 5L have higher strength and toughness and are suitable for high-pressure oil and gas transportation.

The API 5L standard specifies different steel pipe specifications and grades, which are usually divided into:
PSL-1: For ordinary environments, suitable for natural gas or oil transportation in mild climates and medium pressures.
PSL-2: For environments with higher requirements, suitable for harsh environments such as deep-sea mining and extreme weather.
PSL-3: For oil and gas transportation in special environments, usually involving ultra-high pressure, extremely low temperature or highly corrosive environments.

Applications of API 5L Steel Pipe:

API 5L Steel Pipe is primarily used for long-distance transportation of fluids such as oil, natural gas, and water, covering projects including oil and gas field gathering and transportation, trunk pipelines, city gas, chemical engineering, and water conservancy. It can also be used for some structural support (such as piling pipes and bridge components) and emerging energy carriers (such as hydrogen and CO₂ transportation).

1. Core Applications: API 5L Steel Pipe is used in onshore/subsea oil and gas pipelines (crude oil, natural gas, associated gas), natural gas pipeline networks (city gas distribution, gas storage inlet and outlet stations), and oilfield gathering and transportation systems.

2. Extended Applications: API 5L Steel Pipe is used in water supply/drainage projects, chemical media transportation (such as acids, alkalis, and steam), agricultural irrigation, and power transmission casing.

3. Special Scenarios: API 5L Steel Pipe used in acidic environments (including H₂S) requires NACE-compliant steel grades (such as X65S); some high-grade steels (X80 and above) are used in high-pressure, large-diameter trunk lines; a small amount is used in non-pressure-bearing structural components (such as piling pipes and supports).

API 5L covers seamless and welded pipes (ERW steel pipe/LSAW steel pipe/SSAW steel pipe), with steel grades ranging from L245 (Gr.B) to X120. It has a wide range of applicable temperatures and pressures, but is essentially a pipeline for pipeline transportation, not a general-purpose structural or mechanical pipe.

As the cornerstone of the global oil and gas industry, the API steel pipe standard plays a vital role in the design, production, inspection and application of steel pipes. It ensures the safe operation of the oil and gas industry by clearly specifying the specifications, materials, performance and other requirements of steel pipes. With the continuous development of technology, the API carbon steel pipe standard is also constantly evolving, promoting innovation and progress in the global oil and gas industry. For companies and engineers engaged in the oil and gas industry, understanding and mastering the API steel pipe standard is the key to improving project success rate and ensuring engineering safety.

Specifications of Pipeline Steel Pipe:

Standard	Product Level	Steel grade	Yield Strength (min), Mpa	Tensile Strength（MPa）
API 5L GB/T9711.2	PSL 1	A or L210	210	335
		B or L245	245	415
		x42 or L290	290	415
		X46 or L320	320	435
		X52 or L360	360	460
		X56 or L390	390	490
		X60 or L415	415	520
		X70	483	565
	PSL 2	BR or L245R	245~450	415~760
		X42R or L290R	290~495	415~760
		BN or L245N	245~450	415~760
		X42N or L290N	290~495	415~760
		X46N or L320N	320~525	435~760
		X52N or L360N	360~530	460~760
		X56N or L390N	390~545	490~760
		X60N or L415N	415~565	520~760
		X65N or L450N	425~566	525~760
		X70 or L480	484~565	565~768
		X80	552~690	621~827

oduct Level	Steel grade	Chemical composition, %
oduct Level	Steel grade	C	Mn	P	S	Si	V	Nb	Ti	CEpcm
PSL 1	B or L245	≤0.28	≤1.20	≤0.030	≤0.030	–	–	–	–	–
	x42 or L290	≤0.28	≤1.30	≤0.030	≤0.030	–	–	–	–	–
	X46 or L320	≤0.28	≤1.40	≤0.030	≤0.030	–	–	–	–	–
	X52 or L360	≤0.28	≤1.40	≤0.030	≤0.030	–	–	–	–	–
	X56 or L390	≤0.28	≤1.40	≤0.030	≤0.030	–	–	–	–	–
	X60 or L415	≤0.28	≤1.40	≤0.030	≤0.030	–	–	–	–	–
	X70	≤0.28	≤1.40	≤0.030	≤0.030	–	–	–	–	–
PSL 2	BR or L245R	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	c	c	≤0.04	≤0.25
	X42R or L290R	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	≤0.06	≤0.05	≤0.04	≤0.25
	BN or L245N	≤0.24	≤1.20	≤0.025	≤0.015	≤0.40	c	c	≤0.04	≤0.25
	X42N or L290N	≤0.24	≤1.30	≤0.025	≤0.015	≤0.40	≤0.06	≤0.05	≤0.04	≤0.25
	X46N or L320N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.40	≤0.07	≤0.05	≤0.04	≤0.25
	X52N or L360N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	≤0.25
	X56N or L390N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	≤0.25
	X60N or L415N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	–
	X65N or L450N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	–
	X70N	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	–
	X80	≤0.24	≤1.40	≤0.025	≤0.015	≤0.45	≤0.10	≤0.05	≤0.04	–