Overview
CK3MCuN is a superaustenitic stainless steel casting alloy defined by ASTM A351/A351M, engineered for demanding pressure-containing applications requiring excellent corrosion resistance and weldability. Its composition includes high levels of chromium, nickel, molybdenum, copper, and nitrogen, providing superior resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking. This alloy is particularly suited for aggressive service environments such as seawater, brine, bleach plants, and chemical processing systems. The presence of copper improves resistance to sulfuric acid, while nitrogen enhances strength and structural stability. CK3MCuN is often selected for components in desalination, pharmaceutical, and pollution control systems where corrosion performance is critical.
Chemical Composition
Carbon
Manganese
1.20% Max
Silicon
1.00% Max
Phosphorus
0.045% Max
Sulfur
0.01% Max
Chromium
19.50 - 20.50%
Nickel
17.50 - 19.50%
Molybdenum
6.00 - 7.00%
Nitrogen
0.18 - 0.24%
Copper
0.50 - 1.00%
Mechanical Properties
Yield Strength
38 ksi Min
Tensile Strength
80 ksi Min
Elongation at 2 in
35% Min
Frequently Asked Questions
Resources
ASTM Standard
