Stainless Steel Forged Hydraulic Fittings cannot be hardened by heat treatment, but when temperatures up to about 1650 Degree F (870 Degree C) are expected in service, a stabilizing treatment at 1550 Degree F / 1650 Degree F (840 Degree C / 900 Degree C) will result in optimum corrosion resistance. For optimum corrosion resistance in these SS Hydraulic Fittings following welding or for its usage at elevated temperatures, a post - weld stabilizing treatment is recommended.All Rights Reserved