ZERON® 100 - Super Duplex Stainless Steels Available from NeoNickel
  • ZERON® 100

ZERON® 100 is a cost-effective super duplex stainless steel which has been designed to cope well in aggressive and harsh environments. Its excellent performance can meet with a variety of applications, and displays effective resistance to stress corrosion cracking and corrosion resistance under warm seawater conditions, along with superior pitting. Because of these features, ZERON® 100 has become a popular choice used widely across different industries.



PREN = %Cr + 3.3x%Mo + 16x%N    ZERON® 100 PREN > 40


  • Subsea Pipework Systems
  • Heat Exchangers
  • Pressure Vessels
  • Flue Gas Desulfurization Equipment
  • Pulp and Paper
  • Power Generation


Mechanical Properties

Temperature, °C (°F)20 (68)100 (212)150 (302)200 (392)250 (482)
Ultimate Tensile Strength, ksi109102999794
0.2% Offset Yield Strength, ksi8068656258

Design Stresses – Pressure Vessels (ASME)

ZERON® 100 (UNS S32760) is covered for ASME Section VIII, Division 1 construction by code case 2245 and in Section III, Division 1 by Case N-564-2. It is also included in B16.5 (Pipe Flanges and Flanged Fittings), B16.34 (Valves – Flanged, Threaded, and Welding End), 16.47 (Large Diameter Steel Flanges: NPS 26 through NPS 60), B31.3 (process Piping).

Temp, °C (°F)37.8 (100)93.3 (200)149 (300)204 (400)260 (500)316 (600)
Zeron ® 100131.1 ksi31.0 ksi29.4 ksi29.0 ksi29.0 ksi29.0 ksi
2205125.7 ksi25.7 ksi24.8 ksi23.9 ksi23.3 ksi23.1 ksi
AL-6XN®127.1 ksi27.1 ksi25.7 ksi24.6 ksi23.8 ksi23.3 ksi
ZERON® 100236.3 ksi35.9 ksi34.4 ksi34.0 ksi34.0 ksi34.0 ksi


1 ASME Section VIII, Division 1; 2ASME B31.3

Impact Strength

ZERON® 100 has good impact strength. There is no true ductile brittle transition, just a gradual decrease in impact energy as the temperature is lowered. The impact energy varies according to product type and production route.  The impact strength of welded ZERON® 100 is slightly less than that of parent metal.

Present data suggests that 40J (30ft.lbf) is a suitable acceptance criterion for duplex stainless steels and figure 1 shows that 40J is achievable with all product forms of ZERON® 100 (UNS S32760) down to very low temperatures.  To obtain good impact toughness after welding, it requires a higher level of impact toughness in the parent material.  ZERON® 100 super duplex stainless steel base metal typically has a Charpy toughness > 70J at -50°C.

Corrosion Resistance

ZERON® 100 compares favorably in chloride pitting resistance to more expensive 6% molybdenum alloys and is superior to 2205 or 316L.

Alloy% MoCCCT, °C (°F)CPT, °C (°F)PREN
316L2.1< -2.22 (28)20 (68)24
22053.120 (68)49 (120)35
904L4.424 (75)54.4 (130)36
ZERON® 1003.542.2 (108)82 (180 )41
AL-6XN6.243.3 (110)77.8 (172)44
6259.045 (113)51
C-27615.554.4 (130)> 103 (217)67

Available Product Forms

Performance Profile

One of the most notable features of ZERON® 100 is its impact strength, without any true ductile brittle transition; the alloy merely shows a gradual decrease in its impact energy as temperatures lower, setting it apart from other alloys. The impact energy is variable depending on the production and product type. Welded ZERON® 100’s impact strength is only slightly lower than the parent metal’s.

zeron_100History of ZERON® 100

ZERON® 100 first began its development as a corrosion resistant material to be used for North Sea oil pumps. Because this was a difficult task with other alloys so easy to corrode, ZERON® 100 was introduced and quickly became a game-changer in the industry. With its outstanding performance gaining so much attention, the alloys are now used across various diverse industries in a wide choice of different product forms. Common trade names for ZERON® 100 include Super Duplex, 25Cr Duplex, Super Duplex Stainless, F55 Duplex, UNS S32760, and EN 1.4501.

Features of ZERON® 100

ZERON® 100’s impressive features make it a highly functional alloy. These include:

  • GUARANTEED excellence in corrosion performance, with superior resistance to seawater crevice corrosion
  • Cost-effectiveness and reliability
  • Outstanding resistance against stress corrosion cracking under most conditions, including sour and chloride
  • Great resistance to most concentrations of sulphuric acid because of its copper addition
  • Better resistance to corrosion fatigue and erosion corrosion than other stainless steels

Properties of ZERON® 100

Typically ZERON® 100 contains 25 per cent chromium, 7 per cent nickel and 3.6 per cent molybdenum plus the addition copper and tungsten – although it can be modified for various applications.

To buy ZERON® 100 or learn more  get in touch, or fill in our online quote form and we’ll get right back to you!