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

Datasheet updated

2022-08-29 18:49
(supersedes all previous editions)

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

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


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.