scope:

These recommended practices apply to the arc welding of the following base-metal combinations: (1) Similar chromium-molybdenum steels (2) Dissimilar chromium-molybdenum steels (3) Chromium-molybdenum to austenitic chromiumnickel stainless steels (4) Chromium-molybdenum to either carbon or carbonmolybdenum steels In this document, the chromium-molybdenum steel alloys are referred to as Cr-Mo steels. Cr-Mo steels are used extensively in the power, chemical, and petroleum industries. The properties of such piping and tubing materials and the applicable fabrication and inspection requirements are addressed in a wide range of documents, including: (1) ASTM Material Specifications (2) ASME Codes for Pressure Piping, B31 (a) Power Piping (ANSI/ASME B31.1) (b) Chemical Plant and Petroleum Refinery Piping (ANSI/ASME B31.3) (3) ASME Boiler and Pressure Vessel Codes (Sections I, IIA, IIC, VIII, and IX) (4) NBIC National Board Inspection Code for Boilers and Pressure Vessels (ANSI/NB-23)(5) API Piping Inspection Code (Inspection, Repair, Alteration and Rerating of In-Service Piping Systems), (API 570).

abstract: