Special Grade

1. Nitronic 60 (UNS S21800)

Composition:

• Chromium (Cr): 15.5-17.0%
• Nickel (Ni): 8.0-9.5%
• Manganese (Mn): 5.0-6.5%
• Silicon (Si): 1.0-1.5%
• Carbon (C): = 0.08%
• Nitrogen (N): 0.10-0.25%
• Iron (Fe): Balance
• Other elements include phosphorus, sulfur, and trace amounts of other metals.

Key Features:

• Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), particularly in high-chloride environments.
• Strength: Higher strength than standard austenitic stainless steels (e.g., 304 or 316).
• Wear Resistance: Outstanding abrasion resistance and erosion resistance, making it ideal for marine applications and environments that involve abrasive conditions.
• Toughness: Exceptional toughness at low temperatures.

Applications:

• Marine environments (due to its excellent resistance to seawater and chloride corrosion).
• Chemical processing (handling corrosive substances).
• Aerospace (due to its high strength, wear resistance, and good cryogenic properties).
• Food processing equipment, heat exchangers, valves, and other components exposed to abrasive and corrosive conditions.

Key Benefits:

• Corrosion Resistance: It can withstand the effects of sulfuric acid, chlorides, and other aggressive chemicals.
• High Strength: It provides strength comparable to 400-series steels but with superior corrosion resistance.
• Non-Magnetic: Like most austenitic steels, it is non-magnetic in the annealed condition.

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2. Nitronic 50 (UNS S20910)

Composition:

• Chromium (Cr): 14.0-16.0%
• Nickel (Ni): 6.5-9.5%
• Manganese (Mn): 4.0-6.0%
• Silicon (Si): 0.50-1.0%
• Carbon (C): = 0.08%
• Nitrogen (N): 0.10-0.25%
• Iron (Fe): Balance
• Additional elements: Phosphorus, sulfur, and trace amounts of other elements.

Key Features:

• Corrosion Resistance: Offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in marine environments. It also provides good resistance to oxidation and corrosion in sulfuric acid and chlorides.
• Strength: Higher yield strength and tensile strength compared to regular austenitic steels, making it a stronger material.
• Wear Resistance: Superior abrasion resistance compared to other stainless steel grades.
• Toughness: Excellent toughness and resilience at both ambient and low temperatures.

Applications:

• Marine and offshore environments: It's widely used in shipbuilding, offshore oil platforms, and marine hardware.
• Chemical processing and power generation: Particularly in sulfuric acid and chloride-rich environments.
• Aerospace, pumps, valves, and heat exchangers.

Key Benefits:

• Corrosion Resistance: It is often used in highly corrosive environments where more common alloys would degrade rapidly.
• Strength and Toughness: It offers a great combination of strength, toughness, and corrosion resistance, making it suitable for harsh and abrasive environments.
• Heat Resistance: Performs well at elevated temperatures, making it suitable for hot gas filtration and power plant applications.

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Comparison of Nitronic 60 vs. Nitronic 50:

Property	Nitronic 60	Nitronic 50
Corrosion Resistance	Excellent in high-chloride and seawater environments	Excellent in marine environments and sulfuric acid
Wear Resistance	Excellent, especially in abrasive conditions	Very good, better than standard austenitic steels
Strength	High strength, especially in abrasive environments	Very high strength and toughness, especially at low temperatures
Tensile Strength	High, comparable to 400-series steels	Higher than Nitronic 60 and comparable to martensitic steels
Applications	Marine, aerospace, chemical processing, food processing	Marine, offshore platforms, chemical plants, aerospace
Temperature Resistance	Good at low and moderate temperatures	Performs well at elevated temperatures