Due to its unique shape, the processing methods for stainless steel square pipe fittings vary. Here’s an overview:

1. Forging Method: The pipe’s end or a section is extended using a forging machine, reducing the outer diameter. Common machines include rotary, connecting rod, and roller types.

2. Stamping Method: A tapered plug on a press is used to expand the pipe end to the desired size and shape.

3. Bulging Method: This involves placing rubber inside the pipe and compressing it with a punch to form the desired shape, or using hydraulic pressure to expand the pipe.

4. Bending Method: There are three common methods: stretching, stamping, and roller bending, which involve adjusting roller distances to achieve the desired curvature.

5. Rolling Method: A core is placed inside the pipe, and rollers press against the outside, useful for circular edge processing.

6. Rolling Method (without mandrel): Suitable for processing thick-walled pipes, particularly the inner circular edge.