UGI® KC35N Annealed – Premium High‑Strength, Corrosion‑Resistant Nickel‑Cobalt Alloy

UGI® KC35N possesses excellent resistance to sulfidation, high temperature oxidation, hydrogen embrittlement, saline so-lutions and most mineral acids. It’s features exceptional resistance to stress corrosion cracking at very high strength level under severe environmental conditions that can crack most conventional alloys. It is also highly resistant to other forms of localized attack, such as pitting and crevice corrosion.

As UGI® KC35N is a an extremely noble alloy , this can result in galvanic corrosion when electrically coupled with more active metals such as carbon steel, type 316 stainless, or K MONEL®.

UGI® KC35N alloy is included in NACE MR0175 to a maximum hardness of Rockwell HRC 35 (maximum hardness of Rockwell HRC 48 in specific cold reduced plus aged condition). This material requirements lists sulfide stress cracking resistant materials for exposure to sour environment, such as in gas and oil well service.

The high mechanical properties in the as drawn condition and the ability of cold hardening during machining, need to take particular precautions for machining:

UGI® KC35N can be aged in the temperature range of 430 / 650 °C /Air cool

For optimum properties, cold worked KC35N alloy should ne aged @ 540 – 600 °C

The influence of the treatment on annealed material is negligible but become very important on cold drawn products

UGI® KC35N alloy can be successfully TIG welded. In general, welding properties are similar to those of type 304 stain-less. Similar preparations and precautions should be employed.

The welding parameters should be adjusted to ensure that the heat input per pass is low. Approximately 1/2 to 2/3 of the heat input used to weld maraging steel and type 304 stainless steel should be used.