Metals and Alloys for Medical Applications: A Comprehensive Guide

The medical industry demands high-performance materials that combine biocompatibility, corrosion resistance, and mechanical strength. At Lork Group, we specialize in supplying premium-grade metals and alloys tailored for implants, surgical instruments, and medical devices. Our extensive inventory and efficient logistics ensure rapid delivery of medical-grade materials, including:

• Stainless steels (martensitic & austenitic)

• Cobalt-based superalloys

• Titanium and titanium alloys

Below, we explore the key materials used in medical applications, their properties, and their compliance with international standards.

1. Stainless Steels for Medical Use

Austenitic Stainless Steels

Grades for Implants:

• 1.4441 (X2CrNiMo18-14-3, ~AISI 316LVM, ASTM F138/F139, ISO 5832-1)

  • Vacuum arc remelted (VAR) for ultra-high purity.

  • Low carbon to minimize carbide precipitation and improve corrosion resistance.

  • High nickel & molybdenum content enhances resistance to pitting and crevice corrosion.

  • Ferrite-free microstructure ensures biocompatibility.

  • Compliant with ASTM F138 (Grade 2), ASTM F139 (Grade 2), and ISO 5832-1 (Composition D).

Grades for Medical Instruments:

• 1.4310 (X10CrNi18-8, ~AISI 301)

  • Ideal for springs and high-strength components.

  • Gains strength through cold working but has lower corrosion resistance than 316L.

  • Can be tempered (280–420°C) for additional strength (+250 N/mm²).

• 1.4310.4 (Enhanced AISI 301 variant)

  • Optimized nickel content (6.4–6.6%) for superior work hardening.

  • Higher fatigue strength & tensile strength than standard 1.4310.

  • Reduced cold deformation required for achieving high mechanical properties.

• 1.4404 (X2CrNiMo17-12-2, ~AISI 316L)

  • Excellent chloride & acid resistance (superior to AISI 301/302).

  • Widely used in chemical and medical industries.

• 1.4435 (X2CrNiMo18-14-3, ~AISI 316L "BN2")

  • Higher molybdenum content for exceptional corrosion resistance.

  • Reduced δ-ferrite formation due to increased nickel.

  • Preferred for applications requiring extreme durability in harsh environments.

2. Cobalt-Based Superalloys for Implants

Phynox (Elgiloy® Equivalent, ASTM F1058, ISO 5832-7)

• Composition: 40% Co, 20% Cr, 16% Ni, 7% Mo.

• Strengthening Mechanisms:

  • Cold working (UTS up to 2500 N/mm²).

  • Age hardening (520°C for 3h) for additional strength.

• Key Properties:

  • Non-magnetic, biocompatible, and highly corrosion-resistant.

  • Outperforms stainless steels in inorganic acids.

  • Exceptional fatigue strength & spring properties (Young’s modulus: 210 kN/mm²).

  • Wide temperature range (4.2K to 500°C).

• Standards: ASTM F1058, ISO 5832-7, AMS 5875/5876, NACE MR0175.

(Elgiloy® is a registered trademark of Elgiloy Specialty Metals.)

3. Titanium for Medical Implants

Titanium Grade 2 (ASTM F67, ISO 5832-2, R50400, ~3.7035, T40)

• Ultra-high purity (low O, N, H, Fe).

• Excellent biocompatibility & corrosion resistance (even in chlorides).

• Superior cold & hot workability (easy to machine and weld).

• Applications: Bone screws, dental implants, orthopedic devices.

Why Choose Lork Group?

✔ Extensive stock of medical-grade alloys
✔ Fast lead times & reliable logistics
✔ Compliance with ASTM, ISO, DIN, and AMS standards
✔ Technical support for material selection

For high-performance metals in implants, surgical tools, and medical devices, trust Lork Group to deliver quality, precision, and reliability.

Contact us today for your medical alloy requirements!