NITRONIC® 50 (UNS S20910)

NITRONIC® 50 stainless steel forgings are a premium choice for demanding applications in aerospace, marine, and energy industries. Their unique nitrogen-strengthened composition, combined with excellent corrosion and wear resistance, ensures long-term performance in extreme conditions. Compliance with ASTM, AMS, and NACE standards guarantees reliability for critical engineering applications.

Descriptions

1. Chemical Composition

The unique composition of NITRONIC® 50 includes nitrogen for strength and reduced nickel content for cost efficiency:

Element	Composition (%)
Carbon (C)	≤0.06
Chromium (Cr)	20.50-23.50
Nickel (Ni)	11.50-13.50
Manganese (Mn)	4.00-6.00
Silicon (Si)	≤1.00
Nitrogen (N)	0.15-0.30
Molybdenum (Mo)	1.50-3.00
Vanadium (V)	0.10-0.30
Iron (Fe)	Balance

2. Mechanical Properties

NITRONIC® 50 stainless steel forgings exhibit superior strength-to-weight ratios compared to conventional austenitic grades (e.g., 304, 316). Typical properties in the solution-annealed condition are:

Room Temperature Properties

Property	Value
Tensile Strength	760-895 MPa(110,000-130,000psi)
Yield Strength(0.2% offset)	415-550 MPa (60,000-80,000psi)
Elongation (50 mm gauge)	35-45%
Hardness (Rockwell B)	95-100 HRB
Modulus of Elasticity	193 GPa (28x 10⁶ psi)
Density	7.8 g/cm³(0.282 1b/in³)
Melting Range	1370-1420℃(2500-2590°F)

Heat-Treated Condition (Quenched & Tempered)

Condition	Yield Strength (0.2% offset)
-196°C (-320°F)	≥ 690 MPa (100,000 psi)
600°C (1112°F)	≥ 345 MPa (50,000 psi)

3. Common Forging Product

Forged Shafts

Forged Valves

Forged Fasteners

Forged Pump Components

Forged Aerospace Actuators

4. Key Advantages

High Strength: Exceeds conventional austenitic steels (e.g., 2x stronger than 316L).

Corrosion Resistance: Resists pitting, crevice corrosion, and stress corrosion cracking (SCC).

Wear Resistance: Superior galling resistance due to nitrogen hardening.

Cost Efficiency: Lower nickel content reduces material costs compared to high-nickel alloys.

5. Industry standards

Standard	Scope
ASTM A276/A276M	Stainless steel bars and shapes.
ASTM A473	Stainless steel forgings (general).
AMS 5893	Aerospace-grade bars, forgings, and rings.
ASME SA276/SA276M	ASME Boiler and Pressure Vessel Code.
EN 10088-3	Technical delivery conditions for bars and rods.
NACE MR0175/ISO 15156	Compliance for sour service environments.