AMS 5876 is an SAE International aerospace material specification covering cobalt‑alloy strip up to 0.100 inch (2.50 mm) in thickness and up to 4.000 inches (100.00 mm) in width. The corresponding grade is UNS R30003 (W.Nr 2.4711), commercially known as Elgiloy® (European equivalent Phynox, Chinese equivalent 3J21). This non‑magnetic Cobalt‑Chromium‑Nickel‑Molybdenum alloy is produced via VIM + VAR double vacuum melting, offering a unique combination of ultra‑high strength, excellent formability, outstanding corrosion resistance, and high fatigue strength. Aging of cold‑reduced material can provide additional strength increases of up to 25%. |  |
Chemical Composition (UNS R30003 / AMS 5876)| Element | Weight % (min) | Weight % (max) |
|---|
| Cobalt (Co) | 39.0 | 41.0 | | Chromium (Cr) | 19.0 | 21.0 | | Nickel (Ni) | 14.0 | 16.0 | | Molybdenum (Mo) | 6.0 | 8.0 | | Manganese (Mn) | 1.5 | 2.5 | | Iron (Fe) | Balance | – | | Silicon (Si) | – | 1.20 | | Carbon (C) | – | 0.15 | | Beryllium (Be) | – | 0.10 | | Phosphorus (P) | – | 0.015 | | Sulfur (S) | – | 0.015 |
Mechanical Properties| Condition | Heat Treatment | Tensile Strength (MPa) | Tensile Strength (ksi) | Operating Temperature |
|---|
| Annealed | Per AMS 5876 | ≥ 690 (typical 830–1035) | ≥ 100 | -184°C to 454°C | | Spring Temper | No heat treatment | Up to 2100 | Up to 310 | -184°C to 454°C | | Spring Temper + Aged | Aged after cold rolling | Up to 2600 | Up to 380 | -184°C to 454°C |
Hardness (aged condition): Typically HRC 48–55 Strength increase: Aging can provide up to 25% additional strength High fatigue strength: Especially suitable for dynamic loading applications such as springs and seals
Physical Properties| Property | Value | Unit |
|---|
| Density | 8.30 | g/cm³ | | Elastic Modulus (cold‑reduced) | 186 – 200 | GPa | | Elastic Modulus (cold‑reduced & aged) | 206 – 221 | GPa | | Shear Modulus | 76 | GPa | | Coefficient of Thermal Expansion (20–300°C) | 15.2 | μm/m·°C | | Electrical Resistivity | 99.6 | μΩ·cm | | Thermal Conductivity | 12.5 | W/m·K | | Magnetic Property | Non‑magnetic across the entire temperature range | – |
Applicable Specifications| Standard | Description |
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| AMS 5876 | Cobalt Alloy Strip (primary aerospace standard) | | ASTM F1058 | Wrought Cobalt‑Chromium‑Nickel‑Molybdenum Alloys for Surgical Implants | | NACE MR0175 / ISO 15156‑3 | Materials for H₂S‑containing oil and gas environments | | NACE MR0103 | Materials Resistant to Sulfide Stress Cracking in Refining Environments | | ISO 5832‑7 | Forgeable and Cold‑Formed Cobalt‑Chromium‑Nickel‑Molybdenum‑Iron Alloy for Surgical Implants |
Heat TreatmentAnnealing (Per AMS 5876)Aging (Precipitation Hardening)Important: Forming should be performed before heat treatment, as heat treatment strengthens the material and makes subsequent forming more difficult.
Corrosion ResistanceSulfide stress corrosion cracking (SSCC): Highly resistant – the alloy of choice for the most demanding sour well environments. Seawater exposure: Virtually immune to crevice corrosion, stress corrosion, and pitting – even at the highest strength levels. NACE compliance: For H₂S‑containing environments, material must be supplied in the aged (cold‑worked + precipitation‑hardened) condition with hardness not exceeding 48 HRC.
Critical procurement note: The annealed condition called for by AMS 5876 and the hardened condition required by NACE MR0175 are often in conflict. For dual‑certified material, specify a low‑temperature/short‑time aging process (e.g., 425–455°C) to achieve a hardness range of HRC 46.5–48.0 while maintaining yield strength ≥1500 MPa.
Applications| Industry | Applications |
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| Medical & Dental | Surgical implants, orthodontic wires, pacemaker electrode leads, H‑type springs | | Aerospace & Defense | Satellite communications equipment, weapons systems, control cables | | Oil & Gas | Seals, springs for sour well environments (NACE MR0175 certified) | | Semiconductor | High‑precision corrosion‑resistant components | | Watchmaking | Precision springs and components |
ZYTC Alloy – A Professional Chinese Supplier of Cobalt AlloysTianjin ZYTC Alloy Technology Co., Ltd. (ZYTC Alloy) has over 30 years of experience in the specialty metals industry and supplies AMS 5876 Elgiloy (UNS R30003 / 3J21) strip and foil to aerospace, medical, oil & gas, and semiconductor customers worldwide. | Capability | Details |
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| Standards covered | AMS 5876, ASTM F1058, NACE MR0175 & MR0103, ISO 5832‑7 | | Product forms | Strip, foil, sheet, wire, bar, tube | | Dimensional range | Thickness: 0.05 – 2.50 mm; Width: up to 100 mm (custom sizes available) | | Delivery conditions | Annealed, Spring Temper, Spring Temper + Aged | | Quality assurance | Full mill test reports (chemical, mechanical, physical); hardness testing per ASTM E18 | | Value‑added services | Precision slitting, cutting to length, custom dimensions | | Export experience | Products exported to over 50 countries |
ZYTC can supply material with dual certification to both AMS 5876 and NACE MR0175, with hardness tightly controlled to ≤48 HRC for sour service applications. The Chinese equivalent grade 3J21 offers a cost‑effective alternative with performance equivalent to Elgiloy and Phynox.
AMS 5876 UNS R30003 Elgiloy strip and foil is a cobalt‑based superalloy that offers an extraordinary combination of ultra‑high strength (up to 380 ksi / 2600 MPa in the aged condition), excellent formability, outstanding corrosion resistance, high fatigue strength, and non‑magnetic behaviour across a wide temperature range from –184°C to 454°C. Its resistance to sulfide stress corrosion cracking makes it the alloy of choice for the most demanding sour well environments, while its biocompatibility makes it ideal for medical implants. For engineers and procurement professionals requiring AMS 5876 Elgiloy strip and foil, ZYTC Alloy offers over 30 years of metallurgical expertise, rigorous quality assurance, and a comprehensive supply chain – making it a reliable Chinese partner for high‑performance cobalt alloy solutions.
For technical data sheets, stock availability, or custom manufacturing services regarding AMS 5876 Elgiloy strip and foil, please contact ZYTC Alloy: 📧 Email: daisy@zytcsteel.com
📲 WhatsApp: +86 17335753350 |
