Monel 400 (UNS N04400) seamless tubes manufactured to ASTM B163 are mainly used for condenser or heat-exchanger service. These tubes are generally furnished in small size with light wall: from 3″ (76.2 mm) and under in outside diameter with minimum wall thickness of 0.148″ (3.76 mm) and under, and with an average wall thickness of 0.165″(4.19 mm) and under.

Manufacture, Condition, Finish, Hydro Test Pressure

The Monel 400 tubes of ASTM B163 can be manufactured by either hot-rolling or cold-rolling process. It shall be furnished in either annealed or stress-relieved condition with relative surface finishes. The hydrostatic test pressure for Monel 400 tubes shall be 17.5 ksi [120.6 MPa].

Chemical Composition & Mechanical Properties

It has the same chemical composition as that of ASTM B165 UNS N04400. Mechanical properties are listed below,

Condition	Tensile Strength, min. ksi [MPa]	Yield Strength, min. ksi [MPa]	Elongation, min. %	Hardness, HRB
Annealed	70 [483]	28 [193]	35	-
Stress-Relieved	85 [586]	55 [379]	15	≤75

*The mechanical properties of ASTM B163 UNS N04400.

Bending of Tube

The tubes are usually bent to suit for condenser or heat-exchanger service. The minimum bending radius shall be determined by tube O.D, average tube wall, and condition of the tube.