Standard Specification for Welded Nickel-Chromium-Iron Alloy (UNS N06600, UNS N06601, UNS N06603, UNS N06025, UNS N06045, UNS N06690, and UNS N06693) Tubes
适用范围：This specification covers the standard requirements for welded nickel-chromium-iron alloy (UNS N06600, UNS N06603, UNS N06025, and UNS N06045) boiler, heat exchanger, and condenser tubes for use in general corrosion resisting and low- or high-temperature services. Tube shall be made from flat-rolled alloy by an automatic welding process with no addition or filler metal and shall be furnished with the oxide removed. The material shall undergo cold working in either the weld metal only or both weld and base metal subsequent to welding and prior to final annealing. The tubes shall be subjected to flattening test to check for superficial ruptures resulting from surface imperfections, flange test, and one of the following nondestructive tests: hydrostatic or pneumatic (air underwater) for leak testing and eddy current or ultrasonic for electric testing. The material shall conform to the chemical composition limits for nickel, chromium, iron, manganese, carbon, copper, silicon, sulfur, aluminum, titanium, phosphorus, zirconium, yttrium, and cerium. Tensile strength, yield strength, and elongation shall also meet the mechanical property requirements.
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