SR Elbow 90°

SR Elbow 90°, short radius 90 degree elbow in Chinese, is a commonly used change-of-direction connection fitting in industrial piping systems. Its function is to connect two sections of pipes together to change the direction of the pipes by 90 degrees. Compared with the standard long radius elbow (LR Elbow), the bending radius of the SR elbow is 1 times the outer diameter of the pipe (R=1D), which means that the bending is more compact and occupies less space, and is suitable for occasions with limited installation space or compact structure. Short radius elbows are usually used in piping systems with low pressure and low flow rate, or for connecting equipment that requires rapid change of direction. They are widely used in industries such as petroleum and natural gas, chemicals, electricity, boilers, ships, pharmaceuticals, food, water treatment, and papermaking.

Pipe Fitting Manufacturing Process:

Cutting: Precisely size pipes to design specifications.

Forming: Shape via cold pressing, hot bending, or die forging methods.

Welding (segmented parts): Perform joint welding followed by weld seam polishing.

Heat Treatment: Mitigate internal stresses and optimize material strength.

Surface Treatment: Apply sandblasting, electroplating, or corrosion-resistant coatings.

Inspection: Validate dimensions, conduct pressure endurance tests, and execute non-destructive testing (NDT) for compliance certification.

How do we ensure the quality of pipe fittings?

1. Raw material control

Secondary verification ensures reliability

The raw materials we use are all from well-known domestic steel mills such as Baosteel, Qingshan, and Yongxin, with stable and reliable quality. Each batch of materials must be accompanied by a material warranty (MTC) and a positive material identification test (PMI) report before arriving at the factory. After arrival, we will conduct PMI analysis and related inspections again to double-verify its chemical composition and material properties to ensure that it meets production standards and customer needs.

2. Production process management

Full process tracking and quality control

Hongdi is equipped with advanced processing equipment, including CNC lathes, automatic laser cutting equipment, 1,000-ton hydraulic forming machines, elbow mandrel pushers and other key equipment. Each process is strictly controlled by experienced engineers and technicians. Quality inspectors track and take photos of key nodes throughout the process, and use standardized process flow cards for operation guidance to ensure that the products are traceable and consistent.

3. Inspection before delivery

Full inspection before delivery

MTSCO's quality inspection team conducts strict inspections on each finished product, including appearance inspection, PMI verification, size verification, quantity confirmation and non-destructive testing. According to product requirements, we will also carry out in-depth laboratory projects such as mechanical property testing, chemical analysis, and intergranular corrosion testing. For welded pipe fittings, raw materials and finished products must pass 100% ultrasonic or radiographic non-destructive testing.

In addition, we support independent audits by third-party inspection agencies such as SGS, TUV, and BV.

MTSCO has rich operating experience in packaging and container transportation. Large pieces are wrapped in plastic wrap, small pieces are sealed with foam film or plastic, and pearl cotton is added to the port position for protection. The outer packaging is handled with wooden boxes or pallets, and the container is reinforced with wooden strips and ropes to ensure transportation safety. All inspection data and packing processes are recorded and archived with photos to meet customer traceability requirements.