Cast Stainless Steel CD4MCu, ASTM A890






Mechanical PropertiesMetricEnglish
Tensile Strength, Ultimate >= 690 MPa>= 100000 psi
Tensile Strength, Yield >= 485 MPa>= 70300 psi
Elongation at Break >= 16 %>= 16 %

Component Elements PropertiesMetricEnglish
Carbon, C <= 0.040 %<= 0.040 %
Chromium, Cr 24.5 - 26.5 %24.5 - 26.5 %
Copper, Cu 2.75 - 3.25 %2.75 - 3.25 %
Iron, Fe 59.9 - 66.3 %59.9 - 66.3 %
Manganese, Mn <= 1.0 %<= 1.0 %
Molybdenum, Mo 1.75 - 2.25 %1.75 - 2.25 %
Nickel, Ni 4.75 - 6.0 %4.75 - 6.0 %
Phosphorus, P <= 0.040 %<= 0.040 %
Silicon, Si <= 1.0 %<= 1.0 %
Sulfur, S <= 0.040 %<= 0.040 %


Duplex Stainless Steels

Duplex stainless steels are virtually immune to stress corrosion cracking (the Achilles’ heel of common austenitic stainless steels) and are highly resistant to pitting and crevice corrosion.  Possessing these characteristics, it is not surprising to find the majority, but by no means all, of applications to be seawater related.  Duplex stainless steels have many uses in offshore oil and gas production and Naval equipment, particularly sub-surface.