ZERON 100 (F55 Duplex, 25cr Duplex) is a super duplex stainless steel that complies with UNS S32760, made for use in aggressive environments.

While ZERON 100 complies with UNS S32760, We controls the chemistry and production of ZERON 100 in strict accordance with the requirements of our in-house 'MDS' specifications, which are tighter than standard ASTM specifications. This ensures a consistent quality product is produced with optimal corrosion resistance and charpy impact toughness.

Its properties include:

• Resistant to pitting and crevice corrosion in warm seawater with a guaranteed corrosion performance (PREN > 40)


• Lower more stable price compared to nickel based alloys


• Excellent resistance to stress corrosion cracking in both chloride and sour environments


• Superior resistance to sulfuric acid at most concentrations Improved resistance over austenitic stainless to erosion corrosion and corrosion fatigue


• ZERON 100 Fire Protection Piping on an offshore OIL platform High Strength (80,000 psi minimum Yield Strength) permitting designs to reduce weight versus other corrosion resistant alloys


• Readily weldable using ZERON 100X filler metal

Forms of Zeron 100, super duplex stainless steel available at ISHWAR STEEL CORPORATION

• Sheet
• Plate
• Bar
• Pipe
• Welding Products

Chemical Composition, %

Cr	Ni	Mo	C	W	Cu
24.0-26.0	6.0-8.0	3.0-4.0	0.030 Max	0.5-1.0	0.50-1.0
N	Mn	Si	P	S	Fe
0.2-0.3	1.00 Max	1.0 Max	0.03 Max	0.01 Max	Balance

ASTM Specifications

Pipe & Tube	Sheet/Plate	Bar
A790, A928, A789	A240	A276

Mechanical Properties

Room Temperature, Solution Annealed Condition

Tensile Strength, ksi	.2% Yield Strength, ksi	% Elongation in 50mm	Hardness Max.
109	80	25	28 HRC