Overview
CD3MN, also known as 4A or J92205, is a duplex stainless steel that stands out for its exceptional corrosion resistance, particularly in seawater environments. This alloy offers a remarkable combination of strength and corrosion resistance, boasting nearly twice the strength of common stainless steels while effectively resisting chloride-induced stress corrosion cracking and pitting corrosion. Its balanced microstructure, composed of roughly equal parts austenite and ferrite, contributes to its impressive mechanical properties and corrosion resistance. This makes CD3MN a popular choice for demanding applications in marine environments, chemical processing, and other industries where components are exposed to harsh corrosive conditions.
Typical Uses
Centrifuge and dewatering equipment, couplings, heat exchangers, offshore piping systems, paper rolls, pulp digesters, pump and valve components, pressure vessels.
MetalTek Grade
MTEK 2205
Poured At:
Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division
Similar Specifications
Cast UNS: J92205
Wrought UNS: S31803
Wrought Grade: 2205
Cast Grade: CD3MN, 4A
Cast ASTM: A890, A995
Typical Chemical Composition (% by wt.)
Aluminum: n/a
Carbon: 0.03
Chromium: 21.0-23.5
Manganese: 1.5
Iron: n/a
Copper: 1.0 MAX
Nickel: 4.5-6.5
Lead: n/a
Tin: n/a
Silicon: 1
Zinc: n/a
Other: Mo 2.5-3.5; N 0.10-0.30
Minimum Mechanical Properties
Heat Treatment: Solution Anneal
Frequently Asked Questions
Duplex stainless steel contains a balanced mix of austenitic and ferritic phases, offering high strength, good corrosion resistance, and better stress corrosion resistance than standard austenitic grades.
Super duplex stainless steel contains a higher percentage of chromium, molybdenum, and nitrogen than standard duplex steel, offering enhanced strength and corrosion resistance.
Super duplex stainless steel offers higher levels of chromium, molybdenum, and nitrogen, leading to enhanced strength and corrosion resistance compared to standard duplex grades. Super duplex is generally preferred in extreme environments.
Duplex stainless steels are highly resistant to rust and other forms of corrosion, although they can be susceptible in highly acidic or chloride-rich environments without proper maintenance.
Commonly used in chemical processing, marine environments, oil and gas, desalination plants, medical devices, and food processing equipment.
They offer superior strength, excellent resistance to stress corrosion cracking, and better weldability compared to many austenitic steels.
Duplex steels offer higher strength and better chloride stress corrosion resistance but lower ductility than austenitic stainless steels.
Industries such as offshore oil and gas, chemical processing, marine engineering, and desalination rely on super duplex stainless steel for its corrosion performance.
