Nascent Pipe & Tubes is one of the prominent stockiest and distFlangesutor of quality Nickel Alloy 200 Fasteners (Washers), which can be used in pressure vessel construction up to 300 Degree C. Nickel 200 Flat Washers is age - hardenable Cu - Ni casting alloys with additions of aluminium, chromium or beryllium must also be mentioned. Nickel 200 Lock Washer with 2 % Al can be used in the as - cast state or age - hardened, where the largest increase of strength is achieved by adding beryllium - after age hardening.