1. What is a super duplex S32760 equivalent to?
European/Nordic Standards:
EN 10216-5: X2CrNiMoN25-7-4 (1.4501)
SS 2328 (Swedish standard)
ISO Standard:
ISO 15510: X2CrNiMoN25-7-4
Other Regional Designations:
JIS SUS825 (Japan)
AFNOR Z2CND25-07 (France)
DIN W.Nr. 1.4501 (Germany)
These equivalents share similar chemical compositions (24–26% Cr, 6–8% Ni, 3–5% Mo, ~0.3% N) and mechanical properties, ensuring interchangeability in global projects.
2. What is the hardness of super duplex S32760?
Rockwell Hardness (HRB): ≤ 31
Vickers Hardness (HV): ≤ 320
Brinell Hardness (HB): ≤ 310
This hardness balances corrosion resistance with formability, making it suitable for machining, welding, and fabrication while resisting abrasion in corrosive environments. Cold working can slightly increase hardness (e.g., up to HV 350), but it must be managed to avoid stress corrosion cracking.
3. What is the yield strength of super duplex S32760?
Minimum Yield Strength (Rp0.2):
At room temperature: ≥ 550 MPa (79,770 psi)
At 300°C (572°F): ≥ 450 MPa (65,260 psi)
Tensile Strength: ≥ 750 MPa (108,780 psi)
Elongation: ≥ 25%
This high yield strength allows S32760 to withstand heavy loads and high-pressure environments (e.g., subsea pipelines or chemical reactors) while maintaining ductility to prevent brittle failure.
4. What grade is S32760 material?
Chemical Composition (key elements):
Chromium (Cr): 24–26%
Nickel (Ni): 6.0–8.0%
Molybdenum (Mo): 3.0–5.0%
Nitrogen (N): 0.20–0.30%
Copper (Cu): 0.5–1.0% (added for enhanced resistance to sulfuric acid)
Standards Compliance:
ASTM A890/A890M (castings)
ASTM A240/A240M (wrought plates, sheets)
UNS S32760 (USA)
EN 10088-3: X2CrNiMoN25-7-4 (Europe)
Its "super duplex" designation stems from surpassing standard duplex steels (e.g., 2205) in molybdenum, nitrogen, and corrosion resistance, particularly in chloride-rich media.
5.What is the difference between S32750 and S32760?
When comparing S32750 and S32760, both are super duplex alloys, but S32760 includes 0.5–1.0% copper, a key differentiator. S32750 (2507) excels in pure chloride environments like seawater, relying on its balanced austenite-ferrite microstructure. S32760's copper addition boosts resistance to sulfuric acid and crevice corrosion, making it suitable for acidic, chloride-laden media (e.g., chemical processing or paper mills). While S32750 is the go-to for offshore oil and desalination, S32760's copper-driven advantages make it pricier but essential for mixed acid-chloride applications.
