(1) Seamless steel tubes offer a wide range of wall thicknesses, capable of producing small diameters with thick walls and large diameters with thick walls, although length is generally limited (only a few manufacturers can produce extra-long tubes). Stainless steel welded tubes, on the other hand, can have thinner walls, accommodating large diameters with thin walls and small diameters with thin walls. Theoretically, the longer the coil, the longer the welded tube can be produced. Generally, thicker walls are more suitable for seamless tubes, while thinner walls are better suited for welded tubes.

(2) In terms of wall thickness uniformity and concentricity, stainless steel welded pipes outperform seamless stainless steel pipes. This is due to the more uniform thickness tolerance of cold-rolled sheets, which results in even deformation during the forming process. However, weld seams may protrude, with different companies and specifications requiring varying weld heights. In special cases, the welding can be done first, followed by cold drawing or cold rolling. During the seamless pipe rolling process, issues such as uneven thickness and concentricity can arise due to factors like equipment precision and material properties, although the roundness is generally better than that of welded pipes.

(3) The stainless steel welded pipe offers better uniformity and superior surface quality. The expansion function is improved. The cold rolled steel plate has better uniformity in properties compared to the pipe material, and the welded pipes typically undergo online solidification, resulting in uniform heat treatment and more stable properties. However, currently, mid-to-low-end stainless steel welded pipes on the market do not undergo heat treatment, leading to significant quality variations. Seamless stainless steel pipes, when sampled from different positions on the same tube, may exhibit varying properties, with some differences being quite substantial. During heat treatment, there can be uneven heating and inconsistent cooling rates when the pipes are bundled together for treatment.

(4) Corrosion resistance is appropriate. The welds have been heat treated to meet material requirements. Without heat treatment, the corrosion resistance of stainless steel welded pipes is significantly reduced compared to seamless stainless steel pipes.

(5) Welding pipes have lower production costs and are more environmentally friendly. Good welding pipe factories can maintain an appropriate factory environment akin to electronic factories; whereas seamless pipe factories are filled with oil and lubricants, and the pickling environment is particularly poor.

(6) Varying pressure tolerance. Under the same standard conditions, seamless stainless steel pipes can withstand higher pressure than welded pipes.

(7) Price differences. Generally speaking, seamless stainless steel pipes are more expensive than welded pipes. However, there are a few characteristics to consider: thick-walled pipes are more suitable for seamless pipes, while thin-walled pipes are more suitable for welded pipes.

(8) Delivery cycles vary; stainless steel welded pipes are made from stainless steel sheets, with a relatively simpler manufacturing process, resulting in shorter delivery times. Stainless steel seamless pipes start with round steel, undergo multiple cold drawing/cold rolling processes, and then are heat treated and pickled before being finished products, which leads to a longer production cycle.