Stainless steel pipes can be made by two methods: seamless (extruded from a solid billet) or welded (formed from a flat sheet and welded). The stainless steel pipes market includes both, but welded pipes have gained share due to lower cost and consistent wall thickness. The stainless steel pipes market for "welded" pipes is the largest. The stainless steel pipes market for "seamless" pipes is used for high-pressure, critical applications (e.g., hydraulic lines). The stainless steel pipes market for "welded" pipes are suitable for most applications.
The broader stainless steel welded pipe market is the welded segment. The stainless steel pipes market for "ERW" (electric resistance welding) is the most common method. The stainless steel pipes market for "EFW" (electric fusion welding) is used for large diameters. The stainless steel pipes market for "laser" welding provides a narrow, high-quality weld. The stainless steel pipes market for "TIG" (tungsten inert gas) welding is used for sanitary and high-purity applications.
The stainless steel pipes market for "cold-rolled" sheet is the starting material for welded pipes. The stainless steel pipes market for "pickling" and "passivation" (acid treatments) remove scale and restore corrosion resistance after welding. The stainless steel pipes market for "annealing" (heat treatment) relieves stresses from welding.
The stainless steel pipes market for "nondestructive testing" (NDT) of the weld is critical: "eddy current" testing and "hydrostatic" testing are common. The stainless steel pipes market for "X-ray" inspection is used for critical welds.
The stainless steel pipes market for "grades" (304, 316, etc.) as covered. The stainless steel pipes market for "surface finish" (2B, BA, #4, etc.) affects appearance and cleanability.
Looking ahead, the stainless steel pipes market will see the development of "high-strength" stainless grades (e.g., duplex) for weight reduction. The stainless steel pipes market for "thin-wall" pipes for lighter structures. The stainless steel pipes market for "corrugated" stainless steel pipe (for flexible gas lines) is a niche.
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