API Certified 90° Elbow Manufacturer

 API Certified 90° Elbow Manufacturer

Hebei Longrun Pipeline Group Company is an API certified 90° elbow manufacturer specializing in the production of high-quality pipeline fittings for oil and gas transmission, petrochemical processing, power generation, and general industrial systems. The 90-degree elbow is a critical component used to change the direction of fluid flow while maintaining system pressure, structural integrity, and operational stability.

Standards and Compliance

As an API certified manufacturer, Hebei Longrun Pipeline Group Company follows a structured quality control system that governs every stage of production, from raw material procurement to final inspection and shipment. Our 90° elbows are manufactured in accordance with API specifications, as well as ASME B16.9, ASTM A234, ASTM A420, and other relevant international standards.

This compliance ensures that each elbow meets defined requirements for dimensional accuracy, material properties, and performance under pressure. Full traceability is maintained through heat numbers, batch records, and inspection documentation, allowing products to be verified at any stage of the supply chain.

Materials and Product Range

The factory produces 90° elbows in a wide range of materials suitable for various operating conditions:

Carbon steel for general-purpose pipelines
Low-temperature carbon steel for sub-zero environments
Alloy steel for high-temperature and high-pressure systems

Product configurations include long radius (LR) and short radius (SR) elbows, with size ranges covering small bore piping to large-diameter transmission lines. Wall thickness is manufactured according to standard pipe schedules, ensuring compatibility with connected piping systems.

Manufacturing Process

The production of seamless 90° elbows begins with high-quality steel pipes that undergo chemical composition analysis and mechanical property verification. Forming is carried out using hot induction bending or hot pushing processes.

In hot induction bending, a localized section of the pipe is heated and gradually shaped into a 90-degree angle using controlled mechanical force. This method ensures uniform wall thickness distribution and smooth curvature, reducing stress concentration points. Hot pushing is commonly used for standard elbow sizes, enabling efficient production with consistent geometry.

For large-diameter elbows or special requirements, welded elbows are fabricated from steel plates. These products undergo welding procedures followed by heat treatment to ensure structural strength and reliability.

After forming, heat treatment processes such as normalizing or quenching and tempering are applied to refine the material microstructure and relieve internal stress. Final machining operations ensure precise end preparation and dimensional accuracy.

Inspection and Testing

Each 90° elbow is subjected to comprehensive inspection and testing procedures:

Dimensional inspection for angle accuracy and tolerances
Tensile and hardness testing
Impact testing for low-temperature applications
Ultrasonic testing (UT) and radiographic testing (RT)
Visual inspection of surface condition

Hydrostatic testing and third-party inspection services can be arranged according to project requirements. All products are clearly marked with size, material grade, heat number, and standard reference to ensure traceability.

Applications

API certified 90° elbows manufactured by Hebei Longrun Pipeline Group Company are widely used in:

Oil and gas pipeline systems
Petrochemical and refinery plants
Power generation facilities
Industrial fluid transportation networks

These elbows are designed to provide stable directional changes in pipelines while maintaining consistent flow characteristics and system performance.