316LVM Stainless Steel

┃ Material

316LVM, 316LS, UNS S31673, UNS S31675, W.Nr. 1.4441, 00Cr18Ni14Mo3, X2CrNiMo18-15-3

 

┃ Overview

Stainless steel 316LVM, 316LS, S31673, S31675 for surgical implants.

The grade of 316LVM is a modified version of 316 with low carbon, high nickel and molybdenum. The purpose of the improvement of chemical composition is to maximize the corrosion resistance of the material by obtaining a ferrite free metallographic structure. In order to ensure purity and uniformity, the double vacuum smelting process (VIM+VAR) is generally adopted.

The material is non-magnetic even after strict cold - forming operation.

 

┃ Characteristics

(1) High strength

(2) High fatigue strength

(3) Excellent microcleanliness

(4) Excellent structural homogeneity

(5) High surface finish

(6) Good biocompatibility

 

┃ Application

316LVM material has been used for many years for permanent implants with good corrosion resistance under annealing conditions. Many new alloys have been studied with 316LVM as a reference. This stainless steel has good ductility in cold working condition.

316LVM is used for implant applications, suture line, orthopaedic connecting wire, skin suture nail, catheter, stylet, bone nail, hipstems, femoralheads, spinalsystems, acetabularcups, intramedullarynails, bonescrews, kneejoints, 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 surgicalin struments and tools; blood lancets, stylets, trocars etc.

 

┃ Chemical composition

316LVM as per ASTM F138

wt%	C	Si	Mn	P	S	Cr	Ni	Mo
≥						17.00	13.00	2.25
≤	0.03	0.75	2.00	0.025	0.010	19.00	15.00	3.00
wt%	N	Cu	Al	Ti	Nb	Ca	Se
≥
≤	0.10	0.20	0.010	0.020	0.050	0.020	0.020

┃ Mechanical property (in annealed condition)

Temper	316LVM
Tensile Rm	71	ksi (min)
Tensile Rm	490	MPa (min)
Rp. 0.2% Yield	27.5	ksi (min)
Rp. 0.2% Yield	190	MPa (min)
Elongation (2" or 4D gl)	40	% (min)

┃ Heat treatment and hardness

Solution treatment 1040°C (1900°F), water or other rapid cool.

Hardness: max. 192 HBW or 200 HV or 90 HRB

 

┃ Micro cleanliness

The micro cleanliness of the steel as determined by Method A of Test Methods E 45, except using Plate I-r, on representative billet or tube samples from the heat shall not exceed the following

Inclusion type	A	B	C	D
Thin	0.5	0.5	0.5	0.5
Heavy	0.5	0.5	0.5	0.5

 

┃ Available Process

(1) Cold worked

(2) Cold worked and bright annealed

(3) Cold worked, annealed and pickled

(4) Cold worked, polished (MP, EP etc.)

(5) Cold worked, bright annealed, polished (MP, EP etc.)

 

┃ Common Tests

Chemical composition

Mechanical properties

Hardness

Grain size

Intergranular corrosion

Micro cleanliness

Micro structure

Eddy current

Ultra sonic

Hydrostatic

Flare

Flattening

Surface condition

Shape and dimension

Positive Material Identification