API 5L steel pipe for pipeline transportation systems

Product Introduction

API 5L Steel Pipe for Pipeline Transportation Systems

Line pipe to ANSI / API Specification 5L for the petroleum and natural gas industries — seamless and welded (SAW, ERW, CDW) pipe conveying gas, water and oil, supplied from Grade A25 up to X80 under product specification level PSL1 or PSL2.

StandardANSI / API Specification 5L

GradesGrade A25 – X80

PSL LevelsPSL1 & PSL2

ManufactureSeamless · SAW · ERW · CDW

DocumentationMill test certificate · Heat number traceable · Third-party inspection on request

The grade name is the strength — in the X grades the number is the specified minimum yield strength in thousands of psi, so X60 is the 60,000 psi rung, written L415 in the SI system.
Two specification levels, the same grades — PSL1 is the standard quality level; PSL2 adds mandatory Charpy impact testing, tighter chemistry with carbon-equivalent control and extended non-destructive testing.
Supplied cut, end-prepared and coated — plain, bevel, screwed or threaded ends, cut to length, with external coating and internal lining applied before shipment.

01What API 5L Line Pipe Is

API 5L is the American Petroleum Institute specification for line pipe — the steel pipe used in pipeline transportation systems in the petroleum and natural gas industries. It covers seamless pipe and welded pipe (SAW, ERW and CDW), and it is specified to convey gas, water, oil and other liquids. Line pipe is bought to move a fluid under pressure over distance rather than to carry a calculated building load, so what gets specified is the strength level (the grade), the size and wall, the specification level (PSL1 or PSL2), and the inspection and coating package.

The grade name carries the strength. In the X grades the number is the specified minimum yield strength in thousands of psi — X60 is the 60,000 psi rung — and the same pipe is written L415 in the SI designation, where 415 is that same requirement in MPa. Below the X series sit the letter grades Grade A and Grade B, with Grade A25 at the bottom of the range. Section 05 sets out the whole ladder with the yield and tensile figure for every rung.

A25 – X80Grade Range CoveredEleven strength levels

PSL1 / PSL2Specification LevelsSame grades, two requirement sets

SMLS · SAW · ERW · CDWManufacturing RoutesSeamless and welded

175 – 555 MPaMin Yield Across the RangeGrade A25 to Grade X80

What this page is: the API 5L overview — the grade system, the two product specification levels and the manufacturing routes, with every grade linked to its own page. The chemical composition and mechanical properties of an individual grade are given on that grade’s page, because they change with the grade, the PSL level, the wall thickness and the edition of the specification your purchase order calls up. The figures certified for your order are the ones on the mill test certificate.

02Technical Specifications

What the API 5L line pipe programme covers, and the commercial terms we supply it on.

Item	Specification Details
Product	API 5L steel pipe (line pipe) for pipeline transportation systems
Executive Standard	Specification for Line Pipe — ANSI / API Specification 5L (ISO 3183 is the corresponding international standard)
Grades Covered	Grade A25, Grade A, Grade B, X42, X46, X52, X56, X60, X65, X70, X80 Grade B X42 X52 X60 X65 X70 X80
Product Specification Levels	PSL1 and PSL2 PSL1 PSL2
PSL2 Delivery Conditions	R, N, Q, M — plus S for sour service and O for offshore service R N Q M S O
Manufacturing Types	Seamless, SAW, ERW, CDW and fabricated Seamless SAW ERW CDW Fabricated
Media Conveyed	Gas, water, oil and other liquids
Size Range	Outside diameter, wall thickness (or schedule) and length confirmed against your line schedule — send the OD, wall, length and quantity
Pipe Ends	Plain, bevel, screwed, threaded Plain Bevel Screwed Threaded
Surface / Coating	Supplied bare, or coated to the project specification Bare Coated
Custom Production	Available — cut to length, end preparation and coating to your specification
MOQ	1 Metric Ton / Negotiable
Delivery Time	5 days for 1–10 metric tons · 10 days for 10–50 metric tons · negotiable above 50 metric tons
Certification	MTC / EN 10204 3.1 / Third-party inspection supported
Payment Terms	L/C, T/T, D/P, Western Union, Paypal, Money Gram

On sizes: this page covers the grade system; what the mill can actually produce depends on the manufacturing route, the diameter and the wall. Send us the outside diameter, wall thickness (or schedule), length, manufacturing type, PSL level, end finish and quantity and we will confirm the item and its stock status. NPS is a size designation rather than a measured dimension — the actual outside diameter and wall thickness follow the schedule and the dimensional tables of the standard, and not every size is produced by every route.

03Available Grades & Specification Levels

The full API 5L range at both product specification levels, with each PSL2 delivery condition listed separately. Click any linked grade to open its dedicated page.

PSL	Delivery Condition	Grades Available
PSL1	No suffix	PSL1 Grade A25 PSL1 Gr.A PSL1 Grade B PSL1 X42 PSL1 X46 PSL1 X52 PSL1 X56 PSL1 X60 PSL1 X65 PSL1 X70 PSL1 X80
PSL2	R — as-rolled	PSL2 Grade B PSL2 X42 PSL2 X46 PSL2 X52 PSL2 X56 PSL2 X60 PSL2 X65 PSL2 X70 PSL2 X80
	N — normalized	PSL2 Grade BN PSL2 X42N PSL2 X46N PSL2 X52N PSL2 X56N PSL2 X60N PSL2 X65N PSL2 X70N PSL2 X80N
	Q — quenched & tempered	PSL2 Grade BQ PSL2 X42Q PSL2 X46Q PSL2 X52Q PSL2 X56Q PSL2 X60Q PSL2 X65Q PSL2 X70Q PSL2 X80Q
	QS — sour service	PSL2 Grade BQS PSL2 X42QS PSL2 X46QS PSL2 X52QS PSL2 X56QS PSL2 X60QS PSL2 X65QS PSL2 X70QS PSL2 X80QS
	M — thermomechanical rolled	PSL2 Grade BM PSL2 X42M PSL2 X46M PSL2 X52M PSL2 X56M PSL2 X60M PSL2 X65M PSL2 X70M PSL2 X80M
	MO — offshore service	PSL2 Grade BMO PSL2 X42MO PSL2 X46MO PSL2 X52MO PSL2 X56MO PSL2 X60MO PSL2 X65MO PSL2 X70MO PSL2 X80MO

The suffix is part of the grade, not an afterthought. PSL2 X60N, PSL2 X60Q, PSL2 X60M and PSL2 X60QS are four different order descriptions — the delivery condition changes the chemical composition and the mechanical property requirements, so the suffix your project calls up has to be stated on the enquiry. Grades shown without a link are supplied to order: send the level, grade, size and quantity and we confirm availability and lead time. Certification and third-party inspection (SGS, BV, DNV or your nominated inspector) can be arranged on request.

04How to Read the Grade Designation

An API 5L designation packs the strength, the unit system and — under PSL2 — the delivery condition into one short string. Once you know the convention you can read a grade name straight off a pipe stencil or a mill certificate.

X + Number: Minimum Yield in ksi

In the X grades the number is the specified minimum yield strength in thousands of pounds per square inch — X42 is the 42,000 psi rung, X60 the 60,000 psi rung, X70 the 70,000 psi rung. It is a floor, not a target: pipe is accepted at or above it.

L + Number: The Same Pipe in MPa

Every X grade also has an SI name in which L stands for line pipe and the number is the specified minimum yield strength in MPa — X42 is L290, X60 is L415, X70 is L485. The two names describe the same pipe, which makes the grade name a direct cross-check on the yield figure quoted on a certificate.

A / B

The Letter Grades

Below the X series sit Grade A (L210) and Grade B (L245), carried over from the older designation and still widely ordered for water and low-pressure gas. Grade A25 (L175) is a separate grade at the bottom of the range and is offered under PSL1 only.

PSL

PSL1 and PSL2

The product specification level follows the grade and sets the requirement set — chemistry, testing, NDT and traceability — not the strength. PSL1 Grade B and PSL2 Grade B sit on the same rung of the ladder and are ordered to two different requirement sets. Section 06 sets out the difference.

R/N/Q/M

The PSL2 Suffix Letter

PSL2 grades carry a suffix for the delivery condition: R as-rolled, N normalizing rolled / normalized / normalized and tempered, Q quenched and tempered, M thermomechanical rolled or formed. S is added for sour service and O for offshore service. See section 07.

One caution on the two numbers: the L value is the rounded SI figure of the same requirement, not a conversion you can do backwards — X60 is specified at 60,200 psi and written L415 MPa. Treat the X number and the L number as two labels for one requirement, and check the unit before comparing a certificate value against a grade name.

05Strength Ladder & How to Choose

Eleven rungs from Grade A25 to X80. Moving up buys pressure capacity and wall-thickness economy, and costs you chemistry control and welding procedure work.

Grade	SI Name	Min Yield Rt0.5	Min Tensile Rm	Where It Is Specified
Grade A25	L175	175 MPa (25,400 psi)	310 MPa	The bottom of the range. Offered under PSL1 only, for low-pressure service.
Grade A	L210	210 MPa (30,500 psi)	335 MPa	Low-pressure water and gas lines. Rarely specified for new high-pressure construction today.
Grade B	L245	245 MPa (35,500 psi)	415 MPa	Water transmission, low-pressure gas distribution and general service — the most widely ordered letter grade.
X42	L290	290 MPa (42,100 psi)	415 MPa	Gathering lines and distribution systems — the usual entry point into the X series.
X46	L320	320 MPa (46,400 psi)	435 MPa	Regional gas networks where the design pressure sits just above the X42 rung.
X52	L360	360 MPa (52,200 psi)	460 MPa	Medium-pressure transmission, and for years the workhorse grade for onshore oil and gas lines.
X56	L390	390 MPa (56,600 psi)	490 MPa	Higher-pressure laterals and export lines where X52 no longer sizes economically.
X60	L415	415 MPa (60,200 psi)	520 MPa	Trunk lines and offshore lines — the step taken when wall-thickness economy starts to matter.
X65	L450	450 MPa (65,300 psi)	535 MPa	High-pressure gas transmission mains, and the current default for long-distance gas.
X70	L485	485 MPa (70,300 psi)	570 MPa	Long-distance high-pressure trunk lines, where a thinner wall pays back the higher tonne price.
X80	L555	555 MPa (80,500 psi)	625 MPa	The top of the range normally supplied — ultra-high-pressure trunk lines where the thinnest wall is economic.

How to read this table: these are the PSL1 minimum values for the pipe body — standard series figures, listed so you can see where each rung sits. They are floors, not typical values: pipe is accepted at or above them, and the measured values for your heat are what appear on the MTC. PSL2 adds a maximum yield and a maximum yield-to-tensile ratio on top of these minima, and the limits move with diameter, wall and the edition called up in your purchase order. Higher grades than X80 exist — X90 and X100 are named in the specification — but they sit outside the range normally stocked; tell us if your project calls for one and we will confirm availability. No elongation figure is quoted here: for line pipe elongation is calculated from the tensile strength and the specimen dimensions under the standard and is reported on the certificate rather than ordered as a fixed number.

06PSL1 vs PSL2: The Two Specification Levels

The technical committee recognised that there are two basic levels of technical requirement for line pipe and developed PSL1 and PSL2. Both apply to every grade on the ladder.

Item	PSL1	PSL2
Charpy V-notch impact test	Not a PSL1 requirement	Mandatory CVN impact testing
Chemical composition	Basic maximum limits for C, Mn, P and S	Tighter limits, plus carbon-equivalent control
Strength data	Minimum yield and minimum tensile	Minimum plus maximum yield, and a maximum yield-to-tensile ratio
Inspection & NDT	The inspection applicable to the manufacturing route	Extended mandatory non-destructive testing
Traceability & documentation	Standard mill documentation	Stricter traceability and certification package
Delivery condition	Stated on the order	Carried in the grade designation as a suffix letter

We deliberately do not fill in PSL2 numbers here. The exact PSL2 limits — carbon-equivalent values, impact test temperatures and absorbed energies, the extent of NDT — are set by the edition of API Specification 5L or ISO 3183 that your purchase order calls up, and they change between editions. Quoting a figure from one edition against a project built to another is how a certificate gets rejected, so we quote against the document your project invokes. Tell us the level and the edition and we will price to that.

07PSL2 Delivery Condition Suffixes

Under PSL2 the delivery condition moves into the grade name itself. Because the different delivery conditions carry different chemical and mechanical requirements, the suffix has to be part of the order description.

Suffix	Delivery Condition	What It Means
R	As-rolled	The pipe is supplied in the as-rolled condition — the baseline, and the one whose limits are usually the loosest of the four.
N	Normalizing rolled, normalized, or normalized and tempered	A normalizing treatment that refines the grain and lifts toughness — the common choice where impact properties matter and full quenching is not required.
Q	Quenched and tempered	Quenching and tempering for the highest strength and toughness combination in the grade, at the highest cost.
M	Thermomechanical rolled or thermomechanical formed	Controlled rolling with accelerated cooling — the route most modern high-strength line pipe is produced by.
S	Sour service (added to the suffix above)	Pipe ordered for sour service — H2S-containing fluid — with the additional hardness and cracking-resistance requirements that service brings. Appears in section 03 as the QS row.
O	Offshore service (added to the suffix above)	Pipe ordered for offshore service, covering the additional requirements for offshore pipelines. Appears in section 03 as the MO row.

Why this matters commercially: ordering “PSL2 X60” with no suffix leaves the delivery condition open, and that is the single most common cause of a quotation that does not match what the project actually needs. The service suffixes combine with the delivery-condition letters rather than replacing them — offshore and sour service each appear with more than one base condition — so state the full designation, level, grade, suffix and any service suffix, on your enquiry.

08Manufacturing Types

API 5L covers seamless line pipe and welded line pipe. Which route applies is set by the diameter, the wall and the service — not by the grade, because every grade is produced by more than one route.

Manufacturing Type	What It Means
Seamless (SMLS)	Produced from a solid billet with no weld seam — the usual choice for small diameters, heavy walls and high-pressure service.
SAW	Submerged-arc welded, longitudinally (LSAW) or helically (HSAW / spiral) from plate or strip — the route for large diameters and heavy walls.
ERW	Electric-resistance welded from coil — the standard route for small and medium diameters.
CDW	Cold drawn welded — cold finishing for tighter dimensional tolerance and a smoother bore.
Fabricated	Fabricated to order for sizes or wall thicknesses outside the standard mill programme.

Route also drives inspection: a weld seam has to be examined and a seamless body does not, so the non-destructive testing package differs by route even when the grade, the size and the PSL level are identical. Give us the diameter and wall and we will confirm which routes can produce it and what inspection each one carries.

09Typical Applications

API 5L line pipe is a pipeline steel — it is specified wherever gas, water, oil or other liquids have to be moved under pressure over distance.

Oil Transmission

Crude oil and petroleum product trunk lines, gathering lines and field flowlines — the original duty of the specification and still one of the two biggest.

Natural Gas Pipelines

Gathering systems, transmission mains and distribution networks — the service that has pushed the industry up the ladder from X52 towards X65, X70 and X80.

Water & Other Liquids

Water transmission and produced-water lines, and the other liquids API 5L pipe is specified to convey under pressure.

Offshore & Sour Service

Offshore pipelines and H2S-containing service, where the MO and QS designations apply and the requirement set goes well beyond the onshore baseline.

Plant, Station & Terminal Piping

Compressor and pump stations, metering skids, terminal and tank-farm piping built to the same line pipe specification as the mainline it serves.

10Processing, End Preparation & Supply

Every order can be cut, end-prepared, coated and documented to your specification, so the pipe arrives on site ready to weld.

Cutting to Length

Cut to the lengths your line schedule calls for — single random, double random or fixed cut lengths.

End Preparation

Plain, bevel, screwed or threaded ends, with the bevel prepared to your welding procedure specification.

Coating & Lining

External coating and internal lining applied to the project specification before shipment, for buried and submerged service.

Inspection & Certified Delivery

Hydrostatic test, NDT and MT carried out as specified, with MTC, EN 10204 3.1 and third-party inspection arranged where required.

Commercial terms: payment by L/C, T/T, D/P, Western Union, Paypal and Money Gram. Indicative lead time is 5 days for 1–10 metric tons and 10 days for 10–50 metric tons, with larger quantities negotiated — confirmed against the production programme when you enquire. Coated line pipe is specified where resistance to crack propagation over the service life of the line matters; the coating type is confirmed with your enquiry.

11Frequently Asked Questions

Q1What does a grade like X60 mean, and is it the same as L415?

Yes — X60 and L415 are two designations of the same pipe. X60 is the US customary name, where the number is the specified minimum yield strength in thousands of psi: 60 ksi, specified at 60,200 psi. L415 is the SI name, where L stands for line pipe and 415 is the same requirement in MPa. Minimum tensile strength at that rung is 520 MPa. Section 05 gives the yield and tensile figure for every rung of the ladder.

Q2Do I need PSL1 or PSL2?

Both levels exist for every grade on the ladder. PSL1 is the baseline — basic chemical limits, tensile and hydrostatic testing, standard documentation. PSL2 adds mandatory Charpy V-notch impact testing, tighter chemical limits with carbon-equivalent control, a maximum yield and a maximum yield-to-tensile ratio, extended non-destructive testing and stricter traceability. Standard onshore water, gas or oil service with no impact requirement is normally PSL1; low-temperature, sour, offshore and high-consequence lines usually call up PSL2. The exact PSL2 limits depend on the edition your project invokes — tell us the level and the edition and we quote to it.

Q3What is the PSL2 suffix letter and do I have to specify it?

Yes, if you are ordering PSL2. The suffix carries the delivery condition — R as-rolled, N normalized, Q quenched and tempered, M thermomechanical rolled — and the different conditions carry different chemical and mechanical requirements. S is added for sour service and O for offshore service. Ordering “PSL2 X60” with no suffix leaves the delivery condition open; the full designation belongs on the enquiry. Section 07 sets out each one.

Q4Should I order seamless or welded?

It is set by diameter, wall and service rather than by grade. Seamless comes from a solid billet with no weld seam and is the usual choice for small diameters, heavy walls and high-pressure service. ERW is the standard route for small and medium diameters, SAW (longitudinal or spiral) covers large diameters and heavy walls, and CDW gives tighter dimensional tolerance and a smoother bore. The inspection package differs by route as well — a weld seam has to be examined. Send the diameter and wall and we will confirm which routes can produce it.

Q5Which grade do I need — B, X42, X52, X60, X65 or X70?

It comes out of the design pressure, the diameter and the fluid. Grade B and X42 cover water and low-pressure distribution; X52 and X56 are the medium-pressure workhorses; X60 and X65 are where wall-thickness economy starts to pay for the higher tonne price; X70 and X80 are long-distance high-pressure trunk-line grades. Higher is not automatically better — the higher rungs tighten chemistry and welding control and cost more per tonne, so the right grade is the lowest one that meets the design pressure with a wall you can actually weld and lay. Send us the design pressure, diameter, fluid and wall and we will size it for you.

Q6What information do you need for a quotation?

The grade and PSL level including the delivery-condition suffix, the outside diameter and wall thickness (or schedule), the length, the manufacturing type, the end finish, the coating requirement, the quantity, any impact or sour-service requirement, the inspection and certification package including third-party inspection, and the destination port. Section 02 lists the terms we supply on.

Get Your API 5L Line Pipe Quotation

Send us your grade and PSL level (with the delivery-condition suffix), outside diameter and wall thickness (or schedule), length, manufacturing type, end finish, coating requirement and quantity. We will reply with available grades, current stock and production lead time, mill price and the certification package — and tell you plainly which rung of the ladder your line actually needs.

Get Price & Grade Availability E-mail: sales@bebonchina.com WhatsApp: +8617398960706

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Quantity(Metric Tons)	1 - 10	10 - 50	>50
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API 5L steel pipe for pipeline transportation systems

Product Introduction