Superior hardness – as plated, mid phosphorous electroless nickel is around 55 on the Rockwell C scale. Rockwell hardness: 54 RC as plated; after post bake, 67 RC Applied temperature: 185°F (85°C) Max Operating Temperature -300°F (-184°C) to 1250°F (677°C) Plating thickness range: 0.00005 to 0.0005 … High Hardness. After heat treatment, which we perform, this can be brought up to 65 – 70 on the Rockwell C scale. (64-68 Rockwell … Nickel Alloy 718 is a precipitation hardenable nickel-chromium alloy. It combines high strength in the aged condition with good corrosion resistance and weldability. A typical hardness of electroless Nickel, as deposited is in the range 450-480 H.V. 718 NACE indicates material stocked in the heat treated condition to have high strength and meet the maximum hardness (40 Rockwell … Rockwell superficial hardness, and Knoop hardness of nickel and high-nickel alloys (nickel content over 50 %). As plated, low phosphorous electroless nickel is around 60 on the Rockwell … The numbers are associated with the Brinnell, Vickers or Forth, Rockwell… The small white plastic card has figures printed in black. (46-48 Rockwell C.) However, the deposits can be precipitation hardened by heat treatment at 400°C for one hour, to 800-950 H.V. The table gives approximate conversions between the figures obtained from several different methods of measuring the hardness of nickel alloy steels.