Overview
J32550, also known as FERRALIUM 255 or S32550, is a high-performance duplex stainless steel renowned for its exceptional strength and corrosion resistance, particularly in demanding marine environments. This alloy boasts nearly twice the strength of common stainless steels, making it suitable for challenging applications where structural integrity is critical. Its duplex microstructure, a balanced combination of austenite and ferrite phases, contributes to its enhanced mechanical properties and its ability to resist various forms of corrosion, including pitting and crevice corrosion in seawater. With a chromium content of up to 27%, J32550 offers superior protection against corrosion in harsh environments, making it a valuable choice for applications where both strength and corrosion resistance are essential.
Typical Uses
Centrifuge and dewatering equipment, couplings, heat exchangers, offshore piping systems, paper rolls, pulp digesters, pump and valve components, pressure vessels.
MetalTek Designation
FERRALIUM® 255
Poured At:
Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division
* Patented or restricted alloys are produced under licenses from their respective owner.
Similar Specifications
Cast UNS: J32550
Wrought UNS: S32550
Wrought Grade: FERRALIUM® 255
Cast Grade:
Typical Chemical Composition (% by wt.)
Aluminum: n/a
Carbon: 0.04
Chromium: 24-27
Manganese: 2
Iron: BAL
Copper: 1.00-2.50
Nickel: 4.5-7.5
Lead: n/a
Tin: n/a
Silicon: 1
Zinc: n/a
Other: Mo 2.7-3.9; N 0.10 MIN; P; S;
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.
