Corrosion resistant hot and cold forming parts of Ni-Cr-Mo alloy and method of making same

In a method of operating a flue gas desulfurizing, a sulfuric acid concentrating or biotechnology plant in which a corrosive medium is contacted with processing plant equipment, the improvement which comprises the step of making, said equipment from an alloy which has been hot or cold formed and consists of (all % by weight):

• 22. 0 to 24.0% chromium
• 15.0 to 16.5% molybdenum
• up to 0.3% tungsten
• up to 1.5% iron
• up to 0.3% cobalt
• up to 0.1% silicon
• up to 0.5% manganese
• up to 0.015% carbon
• up to 0.4% vanadium
• 0.1 to 0.4% aluminum
• 0.001 to 0.04% magnesium
• 0.002 to 0.01% calcium
• balance nickel and inevitable impurities.

A method of making a component of process plant equipment for use in a flue gas desulfurizing, sulfuric acid concentrating or biotechnology plant which comprises hot or cold forming said component from an alloy consisting of (all % by weight):

• 22.0 to 24.0% chromium
• 15.0 to 16.5% molybdenum
• up to 0.3% tungsten
• up to 1.5% iron
• up to 0.3% cobalt
• up to 0.1% silicon
• up to 0.5% manganese
• up to 0.015% carbon
• up to 0.4% vanadium
• 0. 1 to 0.4% aluminum
• 0.001 to 0.04% magnesium
• 0.002 to 0.01% calcium
• balance nickel and inevitable impurities.