ASTM F1058 Elgiloy CoCr Alloy（UNS R30003, Phynox）
Products Description
Elgiloy (UNS R30003, ASTM F1058, ISO 5832-7; domestic grade 3J21) is a cobalt-chromium-nickel-molybdenum-based precipitation-hardening alloy. Revered as the "King of Elasticity" within the medical device sector, it is the material of choice for high-strength, highly corrosion-resistant spring components.
"Why is ASTM F1058 alloy the indispensable choice for applications such as pacemaker leads, orthodontic wires, and precision springs? Because ordinary stainless steel springs tend to gradually 'lose their tension' under stress, meaning their elastic force diminishes over time. In contrast, Elgiloy is classified as an alloy with exceptional 'elastic aftereffect' properties; it exhibits extraordinary resistance to stress relaxation, ensuring that its elastic force remains undiminished for decades, even when situated within the human body or exposed to high-temperature environments."
Its typical applications span several fields:
- Medical: Pacemaker leads, orthodontic wires, orthodontic springs, orthopedic implants, surgical instrument springs (compliant with ISO 5832-7 / ASTM F1058)
- Aerospace: Aero-engine seals, instrument springs, sensor components
- Oil & Gas: Downhole tool springs, sealing components for acidic environments (compliant with NACE MR0175)
Marine Engineering: Deep-sea connector springs, elastic components for seawater environments (resistant to crevice corrosion and pitting)
Precision Instruments: Watch hairsprings,instrumentsu
Elgiloy is one of our best-selling products; we maintain ample stock and offer customization options as well as rapid shipping.
Chemical Composition
| Chemical Range for ASTM F1058 Grade 1 (UNS R30003) | ||
|---|---|---|
| Element | Minimum | Maximum |
| Beryllium | -- | 0.10 |
| Carbon | -- | 0.15 |
| Chromium | 19.0 | 21.0 |
| Cobalt | 39.0 | 41.0 |
| Iron | Balance | -- |
| Manganese | 1.50 | 2.50 |
| Molybdenum | 6.00 | 8.00 |
| Nickel | 14.00 | 16.00 |
| Phosphorus | -- | 0.015 |
| Silicon | -- | 1.20 |
| Sulphur | -- | 0.015 |
| Chemical Range for ASTM F1058 Grade 2 (UNS R30008) | ||
|---|---|---|
| Element | Minimum | Maximum |
| Beryllium | -- | 0.0001 |
| Carbon | -- | 0.15 |
| Chromium | 18.5 | 21.5 |
| Cobalt | 39.0 | 42.0 |
| Iron | Balance | -- |
| Manganese | 1.00 | 2.00 |
| Nickel | 15.00 | 18.00 |
| Phosphorus | -- | 0.015 |
| Silicon | -- | 1.20 |
| Sulphur | -- | 0.015 |
Mechanical Properties
The performance of Elgiloy falls into three distinct tiers.
| Typical Mechanical Properties for ASTM F1058; | |||
|---|---|---|---|
| Form | Tensile Strength (MPa) | Applicable Scenarios | |
| Annealed | <1100 | Requires extensive forming and processing. | |
| Elastic-tempered state | 1400-1900 | Directly manufacture springs and seals. | |
| Spring Tempering + Aging | 1900-2200 | High-Stress, Long-Life Requirements | |
You can select the delivery condition based on your actual application scenario.
Key Points for Technical Communication
Materials of this type are of high value; therefore, prior to providing a quotation, we gather and review inquiries previously raised by customers who have purchased Elgiloy alloys.
Form: Strip, Rod, Wire, Filament, or Tubing?
Dimensions: Thickness/Diameter, Width/Length
Condition: Annealed, Spring-tempered, or Spring-tempered + Aged?
Surface Finish: Bright Annealed, Cold Rolled, or Polished?
Certification Requirements: For medical implant applications, the supplier is required to provide ISO 5832-7 certification and an ISO 10993 biocompatibility report.
The general rule for Elgiloy is: form it first, then heat treat it. If you do it the other way around, it is essentially impossible to work with.
Product Form Reference
| Product Form | Available Size Range | Typical Applications |
| Strip | 0.038–1.9 mm thick, 0.58–229 mm wide | Springs, Seals, Medical Devices |
| Round Wire | 0.15–15.9 mm Diameter | Springs, Orthodontic Wires, Surgical Guide Wires |
| Bars / Tube | Custom-Made | Precision Shafts, Structural Components |
Lork Group is a trusted global supplier of ASTM F1058 alloy (UNS R30003), a premium cobalt-chromium-nickel-molybdenum alloy designed for surgical implants and medical applications. Our ASTM F1058 wire and strip meet stringent biocompatibility, mechanical, and chemical composition requirements, ensuring superior performance in orthopedic, dental, and cardiovascular implants.
Why Choose Lork Group for ASTM F1058 Alloy?
- Medical-Grade Quality – Fully compliant with ASTM F1058 specifications for surgical use.
- Non-Magnetic & MRI-Compatible – Ideal for implants requiring magnetic resonance imaging (MRI) safety.
- Precision Manufacturing – Produced via VIM-ESR (Vacuum Induction Melting & Electroslag Remelting) for high purity.
- Custom Solutions – Available in wire, strip, and other forms to meet your implant manufacturing needs.
Looking for a reliable ASTM F1058 alloy supplier? Contact Lork Group for competitive pricing, material certifications, and technical support.
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