Exera® 316LVM medical wire Wire
2023-11-09 14:40
(supersedes all previous editions)
Exera® 316LVM is a vacuum remelted, molybdenum alloyed, austenitic stainless steel.
The grade is characterized by:
- High strength
- High fatigue strength
- Excellent microcleanliness
- Excellent structural homogeneity
- High surface finish
Standards
-
UNS: S31673 -
DIN: X 2 CrNiMo 18 15 3
Product standards
- Bar and wire: ASTM F138
Chemical composition (nominal)
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|
| ≤0.025 | 0.6 | 1.7 | ≤0.025 | ≤0.003 | 17.5 | 14 | 2.8 | ≤0.10 | ≤0.10 |
Applications
Exera® 316LVM is used for implant applications; hip stems, femoral heads, spinal systems, acetabular cups, intramedullary nails, bone screws, knee joints, and pins, bone and nail plates, internal fixation devices, dental implants, staples.
This grade is also used for cardiovascular applications: guide wires, cardiac stents and for surgical instruments and tools; blood lancets, stylets, trocars.
Corrosion resistance
Exera® 316LVM has very good resistance in physiological environments to:
- General and intergranular corrosion due to high purity and low ferrite content
- Pitting and crevice corrosion due to the high molybdenum content
Exera® 316LVM is capable of passing the Moneypenny Strauss intergranular corrosion test, in accordance with ISO / ASTM requirements.
Forms of supply
Wire, spools / coils
Size range:
Spools: 0.010-2 mm (0.0004-0.79 in.)
Coils: 1-5 mm (0.039-0.197 in.)
The wire in spools/coils is delivered bright drawn.
Tolerances
Ground bars: h8 as standard, h6 on request
Drawn in coil/spool: D2
Tighter tolerances can be offered on request.
Wire, straightened lengths
Bright drawn: diameter 0.60-5.0 mm (0.02-0.197 in.)
Ground diameter: 0.6-10 mm (0.02-0.394 in.)
Tolerances
Drawn, straightened: h9
Tighter tolerances to be discussed in each and every individual case
Other product forms
Exera® 316LVM can also be supplied as bar (round) and tube (thick wall or thin wall), then under the trademark Alleima® 316LVM.
Mechanical properties
| Product form | Condition | Tensile strength | Proof strength | Elongation, A | Hardness, Brinell | ||
|---|---|---|---|---|---|---|---|
| Rm | Rp0.2 | ||||||
| MPa | ksi | MPa | ksi | % |
|||
| min | min | min | min | typical | typical | ||
| Bar, Wire | Annealed | 490 | 71 | 190 | 28 | 45 | 160 |
| Bar, Wire | Medium tensile | 900 | 131 | 700 | 101 | 15 | 285 |
| Bar, Wire | High tensile | 1100 | 160 | 800 | 116 | 12 | 300 |
| Bar, Wire | Extra high tensile | 1400 | 203 | ||||
| Tube, thick wall | Bright annealed | 515-690 | 75-100 | 220 | 32 | min 45 | 155-210 |
| Tube, thick wall | Cold finished | 860-1100 | 125-160 | 690 | 100 | min 12 | 260-330 |
| Profile | Cold rolled | 860-1100 | 125-160 | 690 | 100 | 12 | 260-330 |
| Tube , thin wall Tube, thin wall |
Annealed Cold worked |
490-690 860-1100 |
71-100 125-160 |
190 690 |
28 100 |
40 12 |
|
Note that extra high tensile strength can be achieved for diameter ≤ 5 mm
Physical properties
| Property | ||
|---|---|---|
| Density ( 20 °C) | 8.0 g/cm3 | 0.29 lb/in3 |
| Modulus of elasticity, x103 (20°C) | 200 MPa | 29.0ksi |
| Specific heat capacity (20°C) | 485 J/(kg °C) | 0.11Btu/(lb °F) |
| Thermal conductivity (20°C) | 14W /(m °C) | 8 Btu/(ft h °F) |
| Thermal expansion, x10-6 (30-100°C) | 16.5 per °C | 9.5 per °F |
Machining
| Hardness | Cutting speed range | Feed range | |||
|---|---|---|---|---|---|
| SFM | m/min | IPR | mm/rev | ||
| Turning | 160-300 | 900-145 | 275-45 | 0.002-0.024 | 0.05-0.6 |
| Milling | 160-300 | 870-165 | 265-50 | 0.002-0.016 | 0.05-0.4 |
| Drilling | 160-300 | 115-195 | 35-60 | 0.002-0.012 | 0.05-0.3 |
Disclaimer: Alleima is not providing any products or services that are intended or may be construed to be recommending or otherwise advising on, in any manner, the design, suitability, appropriateness or effectiveness, from a medical/biological/safety perspective, of any medical material, instrument and/or medical device.