ERW LSAW Longitudinal Welded Steel Pipe Q235 Q345 API 5L Gr.B X42-X70 Carbon Steel Straight Seam Welded Pipe

Product Description

Carbon Steel Straight Seam Welded Pipe | ERW/LSAW Longitudinal Welded Steel Pipe Q235 Q345 API 5L Gr.B X42-X70 for Water Transport & Construction

Product Overview

Our carbon steel straight seam welded pipe is manufactured from high-quality carbon steel strip or steel plate through ERW (Electric Resistance Welding) or LSAW (Longitudinal Submerged Arc Welding) processes. The pipe features a single straight weld seam running along the longitudinal direction, ensuring consistent dimensional accuracy and reliable weld integrity. It is widely used for water transport, construction, structural engineering, and fluid conveyance applications.

Available Steel Grades

Mechanical Properties (Reference)

Welding Process Options

• ERW Pipe: High-frequency electric resistance welding process using hot-rolled coil as raw material. The process involves continuous forming, bending, welding, heat treatment, sizing, straightening, and cutting. ERW pipe offers high dimensional accuracy, uniform wall thickness, and good surface quality, making it ideal for small to medium diameter thin-wall applications such as city gas and crude oil transportation.

• LSAW Pipe: Longitudinal submerged arc welding process using single thick steel plate. The steel plate is formed into shape using JCOE or UOE technology, followed by double-sided submerged arc welding. LSAW pipe features wide specification range, excellent weld toughness and plasticity, high pressure resistance, and low-temperature corrosion resistance. It is the preferred choice for high-strength, high-toughness long-distance oil and gas pipelines.

Applications

• Water Transport: Municipal water supply and drainage pipelines, large-diameter water transmission projects

• Oil & Gas Industry: Long-distance oil and gas transmission pipelines, high-pressure pipeline systems

• Construction & Structural Engineering: Building steel structures, bridge supports, piling, scaffolding

• Fluid Conveyance: Low-pressure steam, heating pipelines, chemical industry fluid transport

Quality Assurance

Our carbon steel straight seam welded pipes are manufactured in compliance with GB/T3091, GB/T9711, and API 5L standards. Each pipe undergoes rigorous quality control including:

• Ultrasonic testing for weld seam and base material

• X-ray inspection for weld quality

• Hydrostatic pressure testing

• Mechanical property testing (tensile strength, yield strength, elongation)

Why Choose Our Carbon Steel Straight Seam Welded Pipe?

1. Multi-Standard Compliance – Products meet GB/T3091, GB/T9711, and API 5L requirements for diverse applications

2. Complete Steel Grade Coverage – From Q235/Q345 structural grades to API 5L X42-X70 pipeline grades

3. Advanced Production Technology – ERW and LSAW production lines with automated control systems

4. Strict Quality Control – 100% weld inspection and hydrostatic testing before shipment

5. Competitive Pricing – Direct factory supply with efficient production capacity

Packing & Delivery

• Packing: In bundles, hexagonal bundles, or customized according to customer requirements

• Loading: 20GP / 40GP containers, bulk vessel

• Delivery Time: 15-30 days after deposit confirmation

Contact Us

For inquiries, quotations, or technical specifications of carbon steel straight seam welded pipe, please contact our sales team. We support OEM, customized sizes, and third-party inspection (SGS, BV, etc.).