LSAW Steel Pipe API 5L X65

Overview

API 5L X65 LSAW (Longitudinal Submerged Arc Welded) pipes are engineered for the rigorous demands of long-distance oil and gas pipeline transmission. The submerged arc welding process, applied from both the inside and outside, produces a deep-penetration weld with consistent mechanical properties along the full pipe length — critical for pipeline integrity over decades of service.

Key Features

• High yield strength — minimum 448 MPa yield, delivering a high safety factor for demanding pressure ratings
• Large diameter capability — OD from 16" to 60" for major transmission pipelines
• Impact toughness — Charpy V-notch testing at −20°C ensures performance in cold climates and offshore environments
• Internal and external coating — 3LPE, FBE, or concrete weight coating available for corrosion and buoyancy control
• Stringent quality control — X-ray and ultrasonic weld inspection, hydrostatic testing, and dimensional checks per API 5L PSL2

Typical Applications

Cross-country natural gas and crude oil pipelines, offshore submarine pipelines, water transmission mains, and large-diameter industrial process lines.