API 5L Gr.B PSL1 — Chemical Composition & Mechanical Properties
API 5L Gr.B PSL1 is a carbon steel grade for seamless line pipe (EN / W.Nr L245). It is also known as 5L B. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings.
API 5L Gr.B PSL1 at a glance
| Specification | API 5L Gr.B PSL1 |
|---|---|
| Material family | Carbon steel |
| Product form | Seamless line pipe |
| EN / W.Nr equivalent | L245 |
| Also known as | 5L B |
| Document | TG-MG-022 · Rev. 1 · October 2026 |
Typical service
Oil & gas line pipe
Heat treatment
As-rolled, normalized or as agreed (delivery condition per PSL1)
Chemical composition of API 5L Gr.B PSL1 (weight %)
Other elements and limits: Nb+V 0.06 max (unless agreed); Nb+V+Ti 0.15 max
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 415 MPa |
|---|---|
| Yield strength, min | 245 MPa |
| Elongation, min | Not specified |
| Hardness | Not specified |
About carbon steel
Carbon steel is iron with up to about 0.35 % carbon and 1–1.6 % manganese, and no deliberate chromium, nickel or molybdenum. It is the default material for piping in water, steam, oil, gas and general process service from about −29 °C up to roughly 425 °C.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
International equivalents of API 5L Gr.B PSL1
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — specification | API 5L Gr.B PSL1 |
| Europe — EN designation | L245 (ISO 3183 / EN 10208-2) |
| Japan — JIS | STPG370 |
| China — GB / NB | L245 (GB/T 9711) |
| India — IS | IS 3589 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Standards for API 5L Gr.B PSL1
All material standardsFAQ
API 5L Gr.B PSL1: common questions
What is the minimum yield strength of API 5L Gr.B PSL1?
245 MPa, with a minimum tensile strength of 415 MPa.
What is the carbon content of API 5L Gr.B PSL1?
0.28 max %.
How is API 5L Gr.B PSL1 heat treated?
As-rolled, normalized or as agreed (delivery condition per PSL1).
What is the Chinese (GB) equivalent of API 5L Gr.B PSL1?
The nearest Chinese equivalent is L245 (GB/T 9711). Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of API 5L Gr.B PSL1?
The nearest Japanese (JIS) equivalent is STPG370.
Does Teshi Group supply API 5L Gr.B PSL1?
Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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