Description: BBN steel is a well-known steel manufacturer and service provider in China, API 5L PSL2 Grade B line pipe is our superior product, we are favored by customers with high quality, competitive price and excellent service
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API 5L PSL2 Grade B Line Pipe (L245N / BN) | Seamless & Welded, 245 MPa Min Yield, 415 MPa Min Tensile, NPS 1/2" – 48" OD
ANSI / API Specification 5L, 44th Edition (1 October 2007) | PSL2 | Grade B / L245N / BN | Yield 245 MPa Min – 450 MPa Max, Tensile 415 – 760 MPa, Rt0.5/Rm ≤ 0.93 | Line pipe sizes NPS 1/2" to 48" OD, wall thickness SCH 5 to SCH XXS | Seamless, ERW, Welded, Fabricated & CDW | For Conveying Gas, Water, Oil and Other Liquids
245 MPa Min Yield, 415 MPa Min TensileGrade B — written L245N / BN at PSL2 — is the 245 MPa strength level of API 5L: a minimum yield strength of 245 MPa and a minimum tensile strength of 415 MPa.
PSL2 with Mandatory CVN TestingSupplied to product specification level 2 for oil, gas, water and conventional liquid transmission. PSL2 adds mandatory Charpy V-notch impact testing, tighter chemistry and extended non-destructive testing.
A Defined Strength Window, Not Just a MinimumPSL2 Grade BN is quoted with both limits — yield 245–450 MPa, tensile 415–760 MPa and a yield-to-tensile ratio of 0.93 max — which is the margin a pressure-governed line design is checked against.
01Product Overview
API 5L PSL2 Grade B — designated L245N in the SI system and written BN when the delivery-condition suffix is attached — is a carbon steel line pipe for oil, gas, water and conventional liquid transmission in the petroleum and natural gas industry, supplied to product specification level 2. The specified minimum yield strength is 245 MPa with a maximum of 450 MPa, and the tensile strength runs 415 to 760 MPa, with the yield-to-tensile ratio held to 0.93 maximum.
Grade B is bought when the line is a medium-pressure service and the project wants the PSL2 package behind it: mandatory Charpy V-notch impact testing, a low-impurity chemistry (C 0.24 max, P 0.025 max, S 0.015 max on the source data sheet) with carbon-equivalent control, controlled delivery conditions and extended non-destructive testing. It is supplied seamless, ERW, welded, fabricated and cold drawn welded, and is used for medium-pressure pipeline transmission, pipeline structural parts and mechanical components where the safety requirement is higher than a conventional PSL1 line.
1/2" – 48"Nominal Pipe Size O.D.Line pipe size range
02Technical Specifications
API 5L PSL2 Grade B (L245N / BN) line pipe across the full size and wall programme, with end preparation, coating and inspection handled on the same order.
Item
Specification Details
Steel Grade
API 5L PSL2 Grade B (L245N / BN)
Executive Standard
Specification for Line Pipe — ANSI / API Specification 5L, 44th Edition, 1 October 2007
Product Specification Level
PSL2PSL2PSL1 on request
Product Type
Seamless, ERW, Welded, Fabricated and CDW Line Pipe
Oil & gas transmission, industrial liquid conveyance, pipeline structural parts and mechanical components
Surface / Coating
Supplied bare, or coated to the project specification — coating type confirmed with your enquiry BareCoated
Custom Production
Custom cutting, pipe end processing, anti-corrosion coating and personalized packaging to your specification
MOQ
1 Ton / Negotiable
Delivery Time
Stock availability and production schedule confirmed on enquiry
Certification
MTC / EN 10204 3.1 / EN 10204 3.2 / Full API PSL2 standard inspection reports
Payment Terms
T/T, L/C, Western Union, Trade Assurance
Note: NPS is a size designation, not a measured dimension — the actual outside diameter and wall thickness of the pipe you receive follow the schedule and the standard’s dimensional tables. Not every NPS size is produced in every schedule or by every manufacturing route, and PSL2 supply is tied to a delivery-condition suffix, so send us the outside diameter, wall thickness (or schedule), length, manufacturing type, PSL level, delivery condition suffix and end finish and we will confirm stock status and the exact item before you order.
03Grade Designation
Grade B is a letter grade, not an X-number — it carries two names of its own, and at PSL2 it takes a suffix letter that identifies the delivery condition.
Designation Segment
Meaning in API Specification 5L
B
The letter grade designation — one of the named strength steps (Grade A / Grade B) below the numbered X-grades
L245
The SI designation of the same grade — L for line pipe, 245 for a specified minimum yield strength of 245 MPa
BN
The PSL2 form of the name — the grade letter B followed by the delivery-condition suffix, so BN and L245N are the same pipe as Grade B
N
Delivery-condition suffix at PSL2 — normalizing rolled, normalized formed, normalized, or normalized and tempered pipe (see chapter 07)
PSL2
Product Specification Level 2 — see chapter 04 for what the level changes
Note:Grade B, L245 and BN are three ways of naming the same pipe: the letter grade, the SI name where 245 is the specified minimum yield in MPa, and the PSL2 form with the delivery-condition suffix attached. Unlike the X-grades, the letter B does not stand for a number you can convert — take the 245 MPa from the mechanical table as the cross-check on a mill certificate. The trailing N is not part of the strength name: at PSL2 it records the delivery condition, so the same strength level also exists as BQ, BM and BR. The designation breakdown above is standard background for this grade family; the composition and mechanical data on this page are the Grade BN values.
04Product Specification Level: PSL2
Every API 5L grade, Grade B included, can be ordered under either of two product specification levels. This page documents the PSL2 product.
Item
PSL1
PSL2 (this page)
Charpy V-Notch impact test
Not a PSL1 requirement
Mandatory CVN impact testing
Chemical composition
Basic maximum limits (C, Mn, P, S and the agreed residual limits)
Tighter limits, plus carbon-equivalent control
Strength data
Minimum yield and tensile values
Minimum and maximum yield and tensile values, with a yield-to-tensile ratio limit
Inspection & NDT
The applicable inspection for the manufacturing route
Extended mandatory non-destructive testing
Traceability & documentation
Standard mill documentation
Stricter traceability and certification package
Note: The chemical and mechanical data on this page are the PSL2 values for Grade BN as given in the source data sheet. PSL1 Grade B can be supplied on request, but the exact PSL2 limits, carbon-equivalent requirement and test package are set by the edition of API Specification 5L (or ISO 3183) called up in your purchase order — tell us the level and the edition your project invokes and we will quote against that document.
05Chemical Composition
Chemical composition of API 5L PSL2 Grade BN steel pipe, given as maximum % in the source data sheet.
Grade
C max.
Si max.
Mn max.
P max.
S max.
V max.
Nb max.
Ti max.
Other
API 5L PSL2 Grade BN
0.24
0.40
1.20
0.025
0.015
c
c
0.04
e
Note: Two footnotes come with the source table. c appears in both the V and Nb columns and reads unless otherwise agreed, Nb + V ≤ 0.06% — the two micro-alloying elements share a combined limit rather than each having its own figure, which is why no single number is printed in those two cells. e in the last column reads unless otherwise agreed, Cu ≤ 0.50%, Ni ≤ 0.30%, Cr ≤ 0.30% and Mo ≤ 0.15%. The header of the source table is annotated “chemical composition (a, %)” but the text of that footnote was not included in the data we hold — the composition footnotes of the standard cover items such as the carbon / manganese trade-off, so confirm the applicable footnote set against the edition called up in your order and the MTC. PSL2 additionally places a carbon-equivalent requirement on the pipe, and the limit and formula (CEV / CET / Pcm) depend on the edition and the carbon level — no single value is quoted here rather than picking one for you. With carbon at 0.24 max and manganese at 1.20 max, Grade B reaches its 245 MPa minimum yield with a low-impurity, low-alloy formula, which is what makes it easy to weld and form on site.
06Mechanical Properties
Mechanical properties of API 5L PSL2 Grade BN (L245N) steel pipe, in SI units as given in the source data sheet.
Pipe Grade
Yield Strength Rt0.5 Min (MPa)
Yield Strength Rt0.5 Max (MPa)
Tensile Strength Rm Min (MPa)
Tensile Strength Rm Max (MPa)
Ratio Rt0.5/Rm Max.
L245N or BN
245
450
415
760
0.93
Note: Unlike a PSL1 data sheet, this one gives both ends of the strength range — yield 245–450 MPa and tensile 415–760 MPa — together with the maximum yield-to-tensile ratio of 0.93, which is what limits how close to the tensile strength the actual yield of a length may sit. The source data sheet is SI only: no US customary figures are given with it, so none are printed here (245 MPa is about 35,500 psi and 415 MPa about 60,200 psi, but treat any conversion as rounded and quote the MPa values on your enquiry). No elongation figure is given in the source, so none is quoted here: elongation for line pipe is calculated from the tensile strength and the specimen dimensions under the standard. PSL2 requires Charpy V-notch impact testing, but the required energy and test temperature are set by the edition, the wall thickness and your purchase order — those values are agreed at order stage and reported on the mill certificate.
07Manufacturing Types & Delivery Conditions
Grade B is produced by every standard line pipe manufacturing route, and at PSL2 the delivery condition is written into the grade name as a suffix letter.
Manufacturing Type
What It Means
Seamless
Produced from a solid billet with no weld seam — the usual route for the smaller diameters and heavier walls
ERW
Electric-resistance welded — the standard route for small and medium diameters
Welded
Welded longitudinally or helically from plate or strip for the larger diameters
Fabricated
Fabricated to order for sizes or wall thicknesses outside the standard mill programme
CDW
Cold drawn welded — cold finishing for tighter dimensional tolerance and a smoother bore
API 5L PSL2 line pipe carries a suffix letter for the delivery condition. The pipe documented on this page is BN:
Note: The suffix is part of the order, not an afterthought: it fixes the heat treatment the pipe receives, and it is the condition the mechanical values on the MTC are measured in. The 245–450 MPa / 415–760 MPa window above is the BN data; the other suffixes are supplied to the same grade and their values are confirmed against the item. Tell us the service (low temperature, sour service, structural use), the diameter and wall and the required mechanical properties, and we will quote the delivery condition that satisfies them.
08Inspection & Testing
The tests carried out on API 5L PSL2 Grade B line pipe, and what each one covers.
Test Item
Test Purpose
Chemical Product Analysis
Verifies the low-impurity chemical composition of the finished pipe complies with the PSL2 limits
Tensile & Bend Test
Confirms the 245 MPa minimum yield and 415 MPa minimum tensile strength, the ratio limit, and a stable strength and ductility range
Hydrostatic Pressure Test
Validates pressure resistance and the overall tightness of the line — every length is pressure tested
Flattening Test
Checks pipe body uniformity and eliminates internal defects, applied per the applicable clause for the route
CVN Impact Test (PSL2 Mandatory)
Charpy V-notch impact test — mandatory for PSL2 line pipe, carried out to the temperature and energy agreed in the purchase order
MT & NDT Non-destructive Testing
Magnetic particle and non-destructive examination that removes surface and microscopic internal defects
Note: Which of these tests apply, and at what level, depends on the manufacturing route, the diameter and wall, the PSL level and your purchase order — not on the grade alone. Tell us the specification and inspection class your project invokes and we will confirm the exact test package and issue the MTC and, where required, EN 10204 3.1 / 3.2 or a third-party inspection report (SGS and others) with the delivery.
09Applications & Typical Uses
API 5L PSL2 Grade B is a general-duty pipeline steel — it is specified where gas, water, oil or other conventional liquids have to be moved under medium pressure, and where the project also wants the PSL2 test package.
Oil & Gas Transmission
Medium-standard natural gas and crude oil transmission pipelines with higher safety requirements than a conventional PSL1 line.
Industrial Fluid Conveyance
Water and other conventional liquid media moved under pressure in industrial and municipal systems.
Structural & Mechanical Use
Pipeline structural components and industrial mechanical parts where a weldable, formable carbon steel pipe is needed.
General Energy Pipeline
Medium-pressure petrochemical and municipal pipeline infrastructure projects built to the line pipe specification.
Coated & Buried Lines
Coated line pipe for buried service, where the coating protects the line and the steel carries the pressure and the impact requirement.
Application Industry
Typical Applications
Oil & Gas Transmission
Medium-standard natural gas and crude oil transmission pipelines with high safety requirements
Industrial Fluid Conveyance
Water and other conventional liquid medium transmission systems
Structural & Mechanical Use
Pipeline structural components and industrial mechanical parts
General Energy Pipeline
Medium-pressure petrochemical and municipal pipeline infrastructure projects
Note: Grade B sits at the bottom of the API 5L strength ladder — Grade B (L245) at 245 MPa, X42 (L290) at 290 MPa and X52 (L360) at 360 MPa minimum yield (standard series values). Grade B is the choice when the design pressure is moderate and the pipe also has to be welded, bent and formed easily; X42 and X52 are the steps taken when the pressure calculation needs more yield. Send us the design pressure, diameter and fluid and we will tell you which grade the line actually needs.
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.
1
Cutting to Length
Custom cutting to the exact lengths your line schedule calls for, single or double random, or fixed cut lengths.
2
End Preparation
Plain, bevel, screwed or threaded ends — bevel prepared to your welding procedure specification.
3
Coating & Packaging
Anti-corrosion coating and personalized packaging applied to the project specification before shipment.
4
Inspection & Certified Delivery
Hydrostatic test, CVN impact test, flattening test, MT and NDT carried out as specified, with MTC, EN 10204 3.1 / 3.2 and third-party inspection arranged where required.
We supply high-quality API 5L PSL2 Grade B (L245N) line pipe with strict PSL2 quality control and full traceability, in seamless, ERW, welded, fabricated and CDW manufacture across the NPS 1/2" to 48" size range. We provide one-stop processing services including custom cutting, pipe end processing, anti-corrosion coating and personalized packaging. All products are equipped with official MTC test reports, with EN 10204 3.1 / 3.2 and third-party inspection supported. Welcome to contact us for professional quotations and technical support!
11Frequently Asked Questions
Short answers to the questions we are asked most often about API 5L PSL2 Grade B. For anything not covered here, send us your line schedule and specification.
Q1What does Grade B mean, and is it the same as L245?
Yes — Grade B, L245 and BN are three names for the same pipe. Grade B is the letter grade of API 5L; L245 is the SI name, where L stands for line pipe and 245 is the specified minimum yield strength in MPa. Unlike the X-grades, the letter B is not a number you can convert — take the 245 MPa minimum yield and 415 MPa minimum tensile from the mechanical table as the values that count.
Q2What does the N in BN stand for?
At PSL2 the grade name carries a suffix letter for the delivery condition. N covers normalizing rolled, normalized formed, normalized, and normalized and tempered pipe — the heat-treatment route the 245–450 MPa yield and 415–760 MPa tensile values on this page are measured in. The other suffixes are R (as-rolled), Q (quenched and tempered) and M (thermomechanical rolled or formed), and the same Grade B strength level can be supplied in any of them — tell us which condition your specification calls up.
Q3Why would I specify PSL2 rather than PSL1?
Both levels exist for every API 5L grade, Grade B included. PSL2 adds mandatory Charpy V-notch impact testing, tighter chemical limits with carbon-equivalent control, both minimum and maximum strength values with a yield-to-tensile ratio limit, extended non-destructive testing and stricter traceability. Low-temperature, sour, offshore and high-consequence lines usually call up PSL2; a standard onshore service with no impact requirement is often specified at PSL1. Tell us the service and the edition your project invokes — PSL1 Grade B is supplied on request.
Q4What sizes, wall thicknesses and end finishes can you supply?
Line pipe sizes from NPS 1/2" to 48" O.D., with wall thickness in SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XS and SCH XXS, plus fully customizable thickness. Ends are supplied plain, bevel, screwed or threaded. Not every size is produced in every schedule or by every route, so send the outside diameter, schedule or wall thickness, length, manufacturing type and end finish and we will confirm the exact item and its stock status.
Q5What tests and documents come with the pipe?
The test programme covers chemical product analysis, tensile and bend test, hydrostatic pressure test, flattening test, CVN impact test (mandatory at PSL2), and MT / NDT non-destructive testing. Every length is hydrostatically tested before it leaves. Documentation is the MTC, with EN 10204 3.1, EN 10204 3.2 and third-party inspection (SGS and others) supported. Which tests apply, and at what impact temperature and energy, depends on the route, size, wall, PSL level and your purchase order — tell us the inspection class you need and we will confirm the package.
Q6How does Grade B compare with X42 and X52?
They are neighbours on the same API 5L ladder — Grade B (L245) at 245 MPa, X42 (L290) at 290 MPa and X52 (L360) at 360 MPa minimum yield, with minimum tensile rising in step. The specification level, size range, testing and coating options are handled the same way for all three, so the choice is normally a pressure and wall-thickness calculation. Grade B is the most weldable and formable of the three and the usual pick for structural and mechanical use as well as medium-pressure lines; X42 and X52 buy yield when the design pressure requires it. Send us the design pressure, diameter and fluid and we will size the grade for you.
Send us your outside diameter and wall thickness (or schedule), length, manufacturing type (seamless / ERW / welded / fabricated / CDW), PSL level, delivery condition suffix (N, Q, M or R), CVN impact requirement, end finish, coating requirement and quantity. We will reply with the latest stock status, competitive wholesale price and complete certification documents within 24 hours.
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