Alleima® 316LVM for medical applications

Datasheet updated

2022-10-26 13:57
(supersedes all previous editions)

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Alleima® 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)

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

Alleima® 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

Alleima® 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

Alleima® 316LVM is capable of passing the Moneypenny Strauss intergranular corrosion test, in accordance with ISO / ASTM requirements.

Forms of supply

Tubes, thick wall

Bright annealed or cold drawn
OD 6.0-25.4 mm (0.236-1 in.)
Wall thickness 2.6-8 mm (0.102-0.315 in.)

Dimension range for thick wall tubes (larger sizes can be offered on request)

Tubes, thin wall

Extremely polished or bright surface
OD 0.50-20 mm (0.019-0.787 in.)
Wall thickness 0.1-2 mm (0.0039- 0.078 in.)

Tolerances

Thickness tolerance: +/- 10%

OD tolerance: +/- 0.75% with a minimum of +/-0.02 mm

Roughness
OD > 5mm Ra (outside) < 0.4 (by polishing)
ID > 3.2mm Ra (inside) < 0.4 - depending on thickness/diameter ratio

Specific roughness can be supplied on request, internal cleaning cannot be carried out on inside diameters below 4 mm.

All products are supplied either in the annealed or cold worked condition to provide mechanical properties as required.

Other product forms

Alleima 316LVM can also be supplied as bar (round or flat), wire and profiles (shaped wire).

Mechanical properties

Product form	Condition	Tensile strength		Proof strength		Elongation, A	Hardness, Brinell
		R_m		R_p0.2
		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.

Alleima® 316LVM for medical applications Tube and pipe, seamless