Model No: 316LVM

ASTM F138 / UNS S31673 / 316LVM Stainless Steel

316LVM is a Stainless Steel grade that is vacuum arc remelted in order to maximize corrosion resistance and provide a ferrite free micro structure. Specifically designed for medical and surgical applications.

Delivery :

FOB

minimum order :

100 kilograms

Supply Ability :

5000Tonkilograms / Month

Stock Time :

7-10Day

Country of Origin :

CHINA

Quantity :

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316LVM (UNS S31673) is a Stainless Steel grade that is vacuum arc remelted in order to maximize corrosion resistance and provide a ferrite free micro structure. Specifically designed for medical and surgical applications.

ASTM F138 is the standard specification for wrought 18Cr-14Ni-2.5Mo stainless steel bar and wire for surgical implants, corresponding to UNS designation S31673. Simply put, it is the"implant-grade"standard for medical-grade 316L stainless steel.

316LVM Stainless Steel also offers excellent mechanical properties, including high tensile strength, good ductility, and high elongation. It has a low magnetic permeability, which is beneficial for certain medical applications where magnetic interference needs to be minimized.

Chemical Composition

Element	Min	Max
Cr	17	19
Ni	11	14
Mo	2	3
Mn	-	2
Si	-	1
C	-	0.03
P	-	0.045
S	1.5	0.03
Fe	Balance

Compared to standard 316L, ASTM F138 imposes stricter mandatory requirements regarding purity, microstructure, and corrosion resistance.

Mechanical Properties

Tensile Strength	550 MPa (80,000 psi) minimum
Yield Strength	290 MPa (42,000 psi) minimum
Elongation	35% minimum
Hardness	Rb 95 maximum

ASTM F138 covers three delivery conditions: annealed, cold-worked, and extra-hard. The mechanical property requirements vary significantly among them.

Physical Properties

Density	7.98 g/cm³
Melting Range	1370-1400°C (2500-2550°F)
Thermal Conductivity	14.6 W/m·K (at 100°C)
Electrical Resistivity	0.75 μΩ·m (at 20°C)
Magnetic Permeability	< 1.02 (at 200 Oersted)
Modulus of Elasticity	200 GPa (29 x 10^6 psi)

Procurement and Application Tips

ASTM F138 requires intergranular corrosion testing in accordance with ASTM A262 Practice E (Strauss test); the material is deemed unsensitized only after passing this test.

Standard Distinction: Specify ASTM F138 for bar or wire products, and ASTM F139 for sheet or strip products.
Core Applications: ASTM F138 material is primarily used for temporary or semi-permanent orthopedic implants, such as bone plates, screws, intramedullary nails, and spinal fixation rods. For long-term load-bearing joints (e.g., hip stems), cobalt-based or titanium-based alloys have largely superseded stainless steel.
Procurement Key Points: When requesting quotes from suppliers, specify"ASTM F138, UNS S31673"and require that the material test report explicitly confirms key acceptance criteria, such as PRE ≥ 26, 100% austenitic structure, and a grain size of Grade 5 or finer.

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