This standard specifies the materials, pre-welding preparation, welding, non-destructive testing and other requirements for welding projects of high alloy furnace tubes (including pipe fittings) used in petrochemical tube furnaces. This standard is applicable to the welding, inspection and testing of austenitic steel rolled furnace tubes, centrifugally cast alloy furnace tubes, rolled tube fittings or static cast alloy tube fittings with an alloy content of 18cr-8Ni or higher for petrochemical tube furnaces. acceptance.