UNS N04400 Bars, DIN 2.4360 Bars, Alloy 400 Monel Round Bars

Product Description

Monel Alloy 400—designated as UNS N04400 under American standards, DIN W.Nr. 2.4360 (NiCu30Fe) in Germany, AFNOR NU-30M in France, and BS NA13 in the United Kingdom—is a ductile, solid-solution nickel-copper binary alloy (~67% nickel, ~30% copper) that gains high strength solely through cold working rather than thermal precipitation. Governed primary supply specifications include ASTM B164 and ASME SB164 for hot-finished and cold-drawn rods and round bars, as well as NACE MR0175/ISO 15156 certification for sour gas ($H_2S$) service. Its chemical baseline requires a minimum of 63.0% nickel and 28.0% to 34.0% copper, with strict maximum impurity limits of 2.5% iron, 2.0% manganese, 0.50% silicon, 0.30% carbon, and 0.024% sulfur.

Physically, Alloy 400 features a density of $8.80\text{ g/cm}^3$ ($0.318\text{ lb/in}^3$), a melting range of 1300°C to 1350°C (2370°F to 2460°F), a elastic modulus of $179\text{ GPa}$, and a low thermal conductivity of $21.8\text{ W/m}\cdot\text{K}$. It remains non-magnetic in the fully annealed state, though heavy cold work can raise its Curie point into the 20°C to 50°C range, rendering it slightly magnetic at ambient temperatures. Mechanically, hot-finished or annealed bars specify a minimum tensile strength ($R_m$) of $550\text{ MPa}$ ($80\text{ ksi}$), a minimum 0.2% yield strength ($R_{p0.2}$) of $240\text{ MPa}$ ($35\text{ ksi}$), a minimum elongation ($A_5$) of 35%, and a typical hardness range of 110 to 150 HBW. Cold-drawn, stress-relieved round bars yield higher strength properties, specifying a minimum tensile strength of $620\text{ MPa}$ ($90\text{ ksi}$), a minimum yield strength of $415\text{ MPa}$ ($60\text{ ksi}$), a minimum elongation of 15%, and typical hardness levels between 160 and 220 HBW.