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316LVM/316LS

  • 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 ortubesamples 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

  • Product Forms

    Form

    Size range

    Capillary tube

    OD 0.08 ~ 6.0 mm

    WT 0.015 ~ 1.5 mm

    Thin wall & Ultra thin wall seamless tube

    OD6.0~80.0 mm

    WT 0.05~4.5 mm

    Micro ID and heavythick wall seamless tube

    OD3.0~50.0 mm

    ID0.30~5.0mm

    Precision conic seamless tube

    Bigger end: OD3.0 - 426.0mm

    Smaller end: OD2.5 - 346.0mm

    WT: 0.15 - 40.0mm

    HP/UHP BA+ tube

    EP tube

    OD 1.0 ~ 76 mm

    WT 0.10 ~ 10.0 mm

    Small caliber precision seamless tube

    OD6.0 ~89mm

    WT 0.50 ~9.0 mm

    Profiled seamless tube

    Build to drawing

    Build to specification

    Bourdon tube

    Y40, Y50, Y60, Y70, Y100, Y150

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