Q235B DN150 LSAW Carbon Steel Pipe

DN150 LSAW Carbon Steel Pipe Product Introduction

DN150 (outer diameter 168.3mm) is the standard production specification for small-diameter submerged arc welded (LSAW) pipes exported by GNEE STEEL. Wall thickness is typically 6mm to 12mm, and length and joint type can be customized according to project requirements. This diameter is suitable for various applications such as municipal engineering, structural support, and industrial fluid transportation, and is particularly suitable for mass production applications such as dock casing, small steel structures, and water supply and drainage systems.

DN150 LSAW Carbon Steel Pipe Manufacturing Process

The JCOE forming process ensures reliable and high-strength welds. DN150 straight seam steel pipes are formed using the JCOE process, with double-sided submerged arc welding, resulting in high weld density, good pipe diameter roundness, and uniform wall thickness. Each steel pipe undergoes hydrostatic testing, ultrasonic flaw detection, and X-ray weld inspection before leaving the factory to ensure compliance with international standards such as GB, API, and EN. For small-diameter LSAW steel pipes, stable forming and precise welding processes are crucial for their performance in demanding engineering applications.

Process Stage	Process Name	Process Characteristics	Quality Assurance
Material Preparation	Steel Plate Pretreatment	- Ultrasonic testing for internal defects - CNC edge milling for bevel preparation - Chemical composition and mechanical properties analysis	Ensures defect-free raw materials, bevel accuracy ±0.5mm
Forming Process	JCOE Cold Forming	- J-preforming → C-pressing → O-closing - Three-stage progressive forming - Computer-controlled forming accuracy	Ovality ≤0.5% D, Straightness ≤1mm/m
Welding Process	Double-sided Submerged Arc Welding	- Internal welding + External welding - Automatic flux recovery system - Online weld heat treatment	Weld factor ≥0.95, 100% X-ray inspection pass rate
Sizing Treatment	Mechanical Expansion	- Overall radial expansion rate 1.2-1.5% - Precise control by hydraulic expansion head - Stress relief treatment	Eliminates welding stress, dimensional accuracy meets API standard
Inspection Process	Nondestructive Testing	- Online ultrasonic testing - Real-time X-ray imaging - Weld magnetic particle inspection	100% defect detection rate, 0.1mm detection accuracy
Final Inspection	Pressure Testing	- Hydrostatic test holding 30s - Test pressure ≥5MPa - Automatic leakage detection	Zero leakage standard, 100% pressure capacity compliance rate

About us

We are a leading steel pipe exporter, focusing on providing high-performance solutions for infrastructure and industrial applications worldwide. Our product portfolio includes DN150 LSAW carbon steel pipe manufactured using advanced submerged arc welding technology, ensuring excellent wall thickness uniformity and load-bearing capacity, making it ideal for oil, gas, and water transportation projects. In addition to LSAW steel pipe, we also supply a full range of carbon steel pipes, including ERW, SSAW, and galvanized steel pipe, all of which meet international standards such as API, ASTM, and ISO.

 

 

Hot Tags: q235b dn150 lsaw carbon steel pipe, China q235b dn150 lsaw carbon steel pipe manufacturers, suppliers, Low alloy steel pipes, Carbon Steel Tube, P12 Alloy Steel Pipe, EN10208, spiral submerged arc welded SAWH steel pipe, DIN 17100