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Hebei Longrun Pipeline Group Company is an API certified 90° elbow manufacturer engaged in the production of high-standard pipeline fittings for oil and gas, petrochemical, power generation, and industrial piping systems. The 90-degree elbow is a critical component used to change flow direction while maintaining pressure integrity and mechanical stability within the pipeline network.
As an API certified manufacturer, our production system follows strict quality management procedures covering raw material control, forming processes, inspection, testing, and documentation. 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.
API certification ensures that each elbow is produced under controlled conditions, with full traceability from raw material procurement to final shipment. This is particularly important for upstream drilling systems, transmission pipelines, and refinery projects where safety and regulatory compliance are mandatory.
Our 90° elbows are available in carbon steel, low-temperature carbon steel, and alloy steel grades suitable for different operating environments. Common material grades include:
ASTM A234 WPB for general service
ASTM A420 WPL6 for low-temperature applications
Alloy steel grades for high-temperature or high-pressure service
The product range typically covers diameters from small bore sizes to large transmission pipeline dimensions, with wall thicknesses corresponding to various pipe schedules. Both long radius (LR) and short radius (SR) elbows are available to meet engineering design requirements.
The production of seamless 90° elbows begins with high-quality steel pipes that undergo inspection for chemical composition and mechanical properties. The elbows are formed using hot induction bending or hot pushing methods. During hot forming, the pipe section is heated to a controlled temperature and shaped into a 90-degree angle using specialized bending equipment.
This process ensures smooth curvature and consistent wall thickness distribution along the bend. For larger diameters or specific project requirements, welded elbows can be fabricated from steel plates, followed by welding and heat treatment.
After forming, elbows undergo heat treatment such as normalizing or quenching and tempering to enhance mechanical performance and relieve residual stress. Dimensional inspection ensures compliance with tolerance standards, including angle accuracy, end preparation, and center-to-end measurements.
Each batch of elbows is subject to comprehensive testing procedures, including:
Tensile and hardness testing
Impact testing when required
Ultrasonic testing (UT)
Radiographic testing (RT) for welded elbows
Visual and dimensional inspection
Hydrostatic testing or additional third-party inspection can be arranged according to project specifications. All elbows are marked with size, grade, heat number, standard reference, and manufacturer identification to ensure traceability.
API certified 90° elbows manufactured by Hebei Longrun Pipeline Group Company are widely used in:
Oil and gas transmission pipelines
Refinery and petrochemical processing units
Thermal and nuclear power plants
Industrial fluid transportation systems
By maintaining strict production control and compliance with API standards, our factory supplies elbows designed to perform reliably in demanding operating environments.
