Special Alloy Capillary Tubes in Medical Applications – MP35N, Elgiloy & PH Stainless Steel
Special Alloy Capillary Tubes for Medical Applications
While stainless steel and titanium are the most common materials for medical capillary tubes, certain special alloys offer unique properties that make them essential for demanding medical applications. MP35N, Elgiloy, and precipitation-hardening (PH) stainless steels provide exceptional strength, corrosion resistance, and fatigue performance for critical medical applications.
MP35N (UNS R30035)
MP35N is a nickel-cobalt-chromium-molybdenum alloy with exceptional strength and corrosion resistance.
Properties
| Property | Value |
|---|---|
| Composition | 35% Ni, 35% Co, 20% Cr, 10% Mo |
| Tensile Strength | ≥1380 MPa (cold drawn) |
| Yield Strength (0.2% offset) | ≥1240 MPa (cold drawn) |
| Elongation | ≥10% |
| Hardness | ≥42 HRC |
| Density | 8.66 g/cm³ |
Medical Applications
- Guidewire cores: Superelasticity, kink resistance
- Catheter shafts: High strength, flexibility
- Stent components: Self-expanding stents
- Surgical instrument components: High-strength, corrosion-resistant parts
Elgiloy (UNS R30152)
Elgiloy is a cobalt-chromium-nickel alloy with exceptional strength, corrosion resistance, and fatigue performance.
Properties
| Property | Value |
|---|---|
| Composition | 40% Co, 20% Cr, 15% Ni, 7% Mo, 2% Ni |
| Tensile Strength | ≥2070 MPa (cold drawn) |
| Yield Strength (0.2% offset) | ≥1860 MPa (cold drawn) |
| Elongation | ≥4% |
| Hardness | ≥50 HRC |
| Density | 8.4 g/cm³ |
Medical Applications
- Guidewire cores: High strength, fatigue resistance
- Catheter components: High-strength shafts
- Surgical instrument springs: High fatigue resistance
- Orthodontic wires: Shape memory, superelasticity
PH Stainless Steels (17-4PH, 17-7PH, 15-5PH)
Precipitation-hardening (PH) stainless steels combine the corrosion resistance of stainless steel with the high strength of tool steel.
17-4PH (UNS S17400)
| Property | Value |
|---|---|
| Composition | 17% Cr, 4% Ni, 4% Cu, Nb |
| Tensile Strength | ≥1310 MPa (H1150 condition) |
| Yield Strength (0.2% offset) | ≥1170 MPa (H1150 condition) |
| Hardness | ≥40 HRC |
Medical Applications
- Surgical instruments: High-strength components
- Orthopedic instruments: High-wear components
- Dental instruments: High-strength, corrosion-resistant tools
- Implant components: High-strength, corrosion-resistant parts
Special Alloy Comparison
| Property | MP35N | Elgiloy | 17-4PH | 316L |
|---|---|---|---|---|
| Tensile Strength | 1380 MPa | 2070 MPa | 1310 MPa | 485 MPa |
| Corrosion Resistance | Excellent | Excellent | Good | Excellent |
| Fatigue Resistance | Excellent | Exceptional | Good | Good |
| Biocompatibility | Good | Good | Fair | Excellent |
| Cost | $$$$ | $$$$$ | $$$ | $$ |
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