This specification covers seam welded ferritic-martensitic stainless steel pipe intended for abrasive and general corrosion service. The pipes are classified according to sizes, from NPS 2 to NPS 36. The pipe shall be made using Electric Resistance Welding (ERW) or an automatic fusion welding process with no addition of filler metal during the welding process. All pipes shall be made from heat treated strip or plate, cold formed and welded. Tensile test, flattening test, hydrostatic test, and nondestructive electric test shall be made in accordance with the pipe specification to conform to the requirements specified.

1.1 This specification covers seam welded ferritic-martensitic (dual phase) stainless steel pipe intended for abrasive and general corrosion service, manufactured with or without the addition of filler metal. Nominal sizes are NPS 2 to NPS 36 inclusive, with nominal (average) wall thickness up to 0.75-in. (19 mm).

1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents. Therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation is specified in the order.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.