AMS 5875 UNS R30003 Elgiloy Phynox Cobalt Alloy Strip

ZYTC Alloy supplies AMS 5875 UNS R30003 Elgiloy/Phynox cobalt alloy strip, featuring non-magnetic, high fatigue life and low relaxation up to 380°C for precision spring components.

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AMS 5875 is an SAE International aerospace material specification covering corrosion‑resistant and heat‑resistant cobalt alloy strip. This specification applies to strip up to 0.100 inch (2.54 mm) in thickness, inclusive, and up to 4.000 inches (101.60 mm) in specified width. The alloy designated under this specification is UNS R30003, commercially known as Elgiloy® (or Phynox in Europe), with the Chinese equivalent grade 3J21.

AMS 5875 UNS R30003 (Elgiloy® / Phynox / 3J21) cobalt alloy strip is a high‑performance precision elastic alloy, characterised by ultra‑high strength (up to 2600 MPa), excellent fatigue life, outstanding corrosion resistance, and non‑magnetic behaviour across the entire temperature range. The alloy achieves its final properties through solution heat treatment, cold rolling, and aging, and is widely used in aerospace, medical devices, oil and gas extraction, and precision instrumentation.

For engineers and procurement professionals requiring AMS 5875 cobalt alloy strip, ZYTC Alloy offers over 30 years of metallurgical expertise, rigorous quality assurance, and a comprehensive supply chain – making it a reliable Chinese partner for cobalt alloy solutions.

Chemical Composition

Element	Content (%)
Cobalt, Co	39 - 41
Chromium, Cr	19 - 21
Nickel, Ni	14 – 16
Iron, Fe	11.25 - 20.5
Molybdenum, Mo	6-8
Manganese, Mn	1.5 - 2.5
Carbon, C	≤ 0.15
Beryllium, Be	≤ 0.10

Physical Properties

Properties	Metric	Imperial
Density	8.30 g/cm³	0.300 lb/in³
Melting point	1427 °C	2601 °F

Mechanical Properties

Properties	Metric	Imperial
Tensile strength	970 MPa	141000 psi
Yield strength	480 MPA	69600 psi
Poisson’s ratio	0.226	0.226
Elastic modulus	189.6 GPa	27500 ksi
Hardness, Brinell	224	224
Hardness, Knoop	262	262
Hardness, Rockwell A	60	60
Hardness, Rockwell B	97	97
Hardness, Rockwell C	19	19
Hardness, Vickers	230	230

Thermal Properties

Properties

Metric

Imperial

Thermal expansion co-efficient

(at 0.000-500 °C/32-932 °F)

15.17 µm/m °C

8.42 µin/in °F

Thermal conductivity

12.5 W/mK

86.8 BTU in/hr.ft².°F

Industry Specifications

ZYTC Alloy's AMS 5875 Elgiloy strip fully complies with global aerospace superalloy standards, with complete equivalent grade coverage for diverse engineering design requirements:

AMS 5833
AMS 5834
AMS 5875 (Core strip specification)
AMS 5876
UNS R30003 (Unified material designation)

Dimensional Supply Range

In strict accordance with AMS 5875 specification, ZYTC Alloy supplies standard and customized precision cobalt alloy strip:

Thickness: Up to 2.50 mm (0.100 inch)
Width: Up to 100.00 mm (4.000 inches)
Surface Quality: Ultra-smooth surface, no scratches, no oxide scale, uniform thickness tolerance
Custom Service: Support precision slitting, fixed-length cutting, surface finishing and customized size processing

Applications

As a high-end elastic superalloy, AMS 5875 UNS R30003 Elgiloy/Phynox strip is mainly used for precision elastic components requiring fatigue resistance, corrosion resistance and high-temperature stable elasticity:

Precision Industrial Springs: Corrosion-resistant high-fatigue springs, ultra-thin elastic shrapnel, precision instrument spring components
Aerospace & Defense: High-temperature low-relaxation elastic parts, aerospace precision sensing components
Electronic & Electrical Industry: Non-magnetic precision elastic connectors, instrument diaphragm parts
Medical & High-End Equipment: High-stability elastic structural parts for precision equipment requiring long-cycle service

Contact ZYTC Alloy to obtain detailed datasheets, batch test reports, dimensional customization solutions and competitive quotations for AMS 5875 UNS R30003 Elgiloy / Phynox cobalt alloy strip.

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