Nitinol Wire

Nitinol Wire

Nitinol wire is a nickel-titanium (NiTi) alloy wire prized for two defining properties (superelasticity and shape memory) that let it flex, recover, and return to a set shape. Baoji Chajo draws superelastic, medical-grade nitinol wire with tightly controlled composition and thermo-mechanical processing to deliver fatigue and kink resistance, and biocompatibility for demanding device geometries.

This production begins with the highest quality ingot, which is first drawn into coil and then carefully reduced to the desired wire diameters through a controlled drawing process.

Category:

Delivery Status

● Straightened super-elastic (SE)
● Cold worked (CW)

Typical Alloy Features and Applications

The transformation temperatures and mechanical properties for typical grades of Nitinol are presented in the table below:
Typical Nitinol wire important data, including typical applications
Alloy Straightened Super-Elastic（SE） Typical Medical Application
UTS MPa Elongation % Upper PlateauStress UPS MPa Permanentset after 6% strain % Active Af ℃
A ≥1300 ≥10 ≥480 ＜0.5 +3~+17 Guidewires, braided stents,stoneretrievers, snares,dental files, IUD, sutrues, etc.
B ≥1150 ≥10 ≥440 ＜0.5 +10~+24
C ≥1000 ≥10 ≥400 ＜0.5 +20~+30
* All Mechanical Testing Conducted at 22°C+/-2°C per ASTM F2516-18
Wire Surface Status
● Black oxide
● Light oxide (varies from golden yellow to brown）
● Etched
● Shinny
● Gloss®;（ultra shinny surface）
● Centerless ground

Shape

● Round, Square, Triangle, Flat, Rope

Packaging

● Spool: wire must be wound evenly on the spools, without breaks or tangles;
● Fixed Length: ZHP Medical can cut wire at customer’s requested length;
● Coils.

Nitinol Round Wire Diameters and Tolerances
Wire Diameter Tolerance
4.000≥D≥2.000mm ±0.020mm
2.000＞D＞1.500mm ±0.010mm
1.500≥D＞1.000mm ±0.010mm
1.000≥D＞0.350mm ±0.007mm
0.350≥D＞0.260mm ±0.007mm
0.260≥D＞0.150mm ±0.005mm
0.150≥D＞0.080mm ±0.004mm
0.080≥D＞0.050mm ±0.003mm
0.050≥D≥0.013mm ±0.002mm

Nitinol Flat Wire Diameters and Tolerances

Dimensional tolerances: according to the finished size range

Dimensional tolerances of the thickness （γ: Width-thickness ratio T: Thickness）
γ Thickness Tolerance of  Thickness
2＜γ≤7 0.013≤T≤0.05mm ±0.005mm
0.050＜T≤0.80mm ±0.1×Tmm

Dimensional tolerances of the width （γ: Width-thickness ratio W: Width）
γ Width Tolerance of  Thickness
2＜γ≤7 0.100≤W≤2.5mm ±0.1×Wmm
0.045≤W≤0.1mm ±0.01mm
Notes: 1) Tighter tolerance available upon request
            2) Out of round tolerance shall be one-half the total size tolerance

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