API 5L X65 PSL2 — Chemical Composition & Mechanical Properties
API 5L X65 PSL2 is a high-yield carbon steel grade for seamless line pipe (EN / W.Nr L450). 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 X65 PSL2 at a glance
| Specification | API 5L X65 PSL2 |
|---|---|
| Material family | High-yield carbon steel |
| Product form | Seamless line pipe |
| EN / W.Nr equivalent | L450 |
| Also known as | X65 |
| Document | TG-MG-110 · Rev. 1 · October 2026 |
Typical service
Oil and gas transmission and gathering lines
Heat treatment
Quenched and tempered (Q) for seamless; thermomechanically rolled (M) for welded. No normalised (N) delivery condition exists for X65
Chemical composition of API 5L X65 PSL2 (weight %)
Other elements and limits: Nb+V+Ti 0.15 max; CEIIW 0.43 max; CEPcm 0.25 max
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 535 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 450 MPa |
| Yield strength, max | 600 MPa |
| Tensile strength, max | 760 MPa |
| Charpy | Required (PSL2) |
| Hardness | Not specified |
About high-yield carbon steel
High-yield carbon steels are micro-alloyed carbon–manganese steels made for high-pressure transmission pipelines. The number in the grade is the minimum yield strength in ksi: F52 and X52 mean 52 000 psi (360 MPa).
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 X65 PSL2
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — specification | API 5L X65 PSL2 |
| Europe — EN designation | L450 (ISO 3183) |
| Europe — W.Nr | 1.8975 (L450MB) |
| China — GB / NB | L450 (GB/T 9711) |
| China — old GB designation | X65 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Other high-yield carbon steel grades
High-yield carbon steel overviewStandards for API 5L X65 PSL2
All material standardsFAQ
API 5L X65 PSL2: common questions
What is the minimum yield strength of API 5L X65 PSL2?
450 MPa, with a minimum tensile strength of 535 MPa.
What is the carbon content of API 5L X65 PSL2?
0.18 max %.
How is API 5L X65 PSL2 heat treated?
Quenched and tempered (Q) for seamless; thermomechanically rolled (M) for welded. No normalised (N) delivery condition exists for X65.
What is the Chinese (GB) equivalent of API 5L X65 PSL2?
The nearest Chinese equivalent is L450 (GB/T 9711), formerly X65. Equivalents are close but not identical — compare chemistry and properties before substituting.
Does Teshi Group supply API 5L X65 PSL2?
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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