Overview
CD4MCu, also known as MTEK 29M, is a duplex stainless steel that offers a compelling combination of high strength and exceptional corrosion resistance. This alloy boasts nearly twice the strength of many common stainless-steel grades, making it suitable for demanding applications where structural integrity is crucial. Furthermore, CD4MCu exhibits outstanding corrosion resistance, particularly in harsh environments like those containing sulfuric acid or seawater. It can be age-hardened to further increase its hardness and wear resistance, making it suitable for applications involving friction and abrasion. CD4MCu also offers good machinability and weldability, adding to its versatility in manufacturing processes.
Typical Uses
Centrifuge and dewatering equipment, couplings, heat exchangers, offshore piping systems, paper rolls, pulp digesters, pump and valve components, pressure vessels, sleeves, and flanges.
MetalTek Designation
MTEK 29M
Poured At:
Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division
Similar Specifications
Cast UNS: J93370
Cast Grade: CD4MCu,1A
Cast ASTM: A890, A995
Typical Chemical Composition (% by wt.)
Aluminum: n/a
Carbon: 0.04
Chromium: 24.5-26.5
Manganese: 1.00
Iron: n/a
Copper: 2.75-3.25
Nickel: 4.75-6.00
Lead: n/a
Tin: n/a
Silicon: 1.00
Zinc: n/a
Other: Mo 1.75-2.25
Minimum Mechanical Properties
Heat Treatment: Solution Annealed
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.
