304 Stainless Steel Forging | All Metals & Forge Group
Stainless Steel - Grade 304 (UNS S30400)
To re-harden Nass 45 from H1150 (30RC) to H900 (36 to 47RC):
Nass 45 is a modified 17-4/15-5 type of PH (precipitation hardening) stainless steel. The modifications consist of elements such as Moly, Silicon, Copper, Columbium, etc., combined with unique processing techniques. Thermal treatment of this product, however, remains similar to the standard solution treatment of a non-modified 17-4PH type base metal. Furnace heat the bar to 1,875°F to 1,925°F, hold 1 hour at temperature. Rapidly air- cool to room temperature. (May be oil quenched to room temperature if preferred). Re-heat to 900°F. Hold at temperature for 4 hours. Let material cool to room temperature. Time at temperature is the same regardless of whether it is a 1-1/2"Diameter or at 4"Diameter.
Type 304 and 304L Stainless Steel Explained
Like Type 302, Types 304 and 304L stainless steel have excellent resistance to a wide range of corrosive media and to atmospheric exposures. The low carbon content of Type 304 and especially 304L, by reducing or eliminating carbide precipitation due to welding, makes these types of stainless suitable for a much wider range of corrosive service than Type 302.
Recent developments in stainless steels - ScienceDirect
resist corrosion, maintain their strength at high temperatures and are easy to maintain. They most commonly include chromium, nickel and molybdenum. Stainless steel alloys are used predominantly in the automotive, and construction industries.