316LVM Stainless Steel Bar
316LVM stainless steel bar that is vacuum arc remelted to maximize corrosion resistance and provide a ferrite-free microstructure. 316LVM medical-grade alloy complies with ASTM F138/F139 (wrought stainless steel for surgical implants) and ISO 5832-1 (implants for surgery).
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316LVM Stainless Steel Bar Properties
- Biocompatibility: Safe for long-term contact with bodily tissues/fluids.
- Corrosion Resistance: Superior to standard 316L due to reduced inclusions and passivation (surface oxide layer formation).
- Mechanical Strength: Tensile strength ~485-690 MPa; fatigue resistance suitable for medical devices.
- Ductility: Maintains formability for complex surgical tools/implants.
Chemical Composition
|
Element |
Content (%) |
|
C |
0.03 max |
|
Mn |
2.0 max |
|
Si |
0.75 max |
|
P |
0.025 max |
|
S |
0.010 max |
|
Cr |
17.0 – 19.0 |
|
Ni |
13.0 – 15.0 |
|
Mo |
2.25 – 3.0 |
|
Cu |
0.50 max |
|
N |
0.10 max |
Mechanical Properties
|
Mechanical Properties (At room temperature) |
|
|
Grade |
1.4441 316LVM / 316ESR X2CrNiMo18-15-3 |
|
Tensile Strength |
Tensile Strength changes according to different diameter sizes Diameter: 1.6mm and above (annealed) Yield: min 190 MPA, Tensile: 490 - 690 MPA Diameter: 1.6mm and below (cold drawn) Tensile: 860 - 1035 MPA Diameter: 1.6mm and below (Extra strong) Tensile: 1350 MPA and above |
Forgeability
The grade can be hot forged in the 900/1150°C temperature range. Annealing should be carried out after forging to restore the microstructure (dissolution of carbides).
Polishability
The high level of inclusion cleanliness and the homogeneity of the microstructure of this grade allow optimum polishing.
Heat treatments
Annealing between 1050 and 1120°C followed by rapid quenching can be carried out after forging to restore corrosion resistance in particular, but no heat treatment is used to harden the grade.
-
Processing
Vacuum Melting Reduces gaseous and interstitial impurities, critical for implant safety.
Passivation: Post-fabrication nitric acid treatment to enhance corrosion resistance.
-
Applications
Implants: Bone screws, plates, spinal devices, temporary joint replacements.
Surgical Instruments: Scalpels, forceps, retractors (reusable due to sterilizability).
Advantages Over Alternatives: Cost-effective vs. titanium/cobalt-chromium, yet sufficient for non-load-bearing roles.
-
Considerations
Limitations: Less fatigue strength than titanium alloys; typically used in non-permanent implants.
Testing: We perform Rigorous checks for inclusions, mechanical performance, and biocompatibility per medical standards.
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