NiTi Round Wire
Nitinol Alloy Code
Active Af temperature is one of the critical properties of Nitinol that can determine the effective super-elastic performance of the alloy. Although all the major Ni content in the range of 54.5~57.0mass% conforms the ASTM F2063-18 standard spec, its Af is very sensitive to the chemical composition, detailed grading of Nitinol composition is of crucial importance. This is why at ZHP Medical we use detailed and verified Nitinol code to identify the alloy.
| Alloy Code | A | B | C | D | E | S | K | J | L | M | T |
| *Active Af after heat treament，℃ | 70±10 | 30±10 | 17±7 | 10±7 | 0-15 | 25±5 | 30±10 | -30±10 | -20±15 | 40±10 | 50±10 |
* The real active Af temperature may vary with actual composition and thermo-mechanical history of the product.
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 Code | Straightened Super-Elastic（SE） | Typical Medical Application | ||||
| UTS σb MPa |
Elongation δ% |
Upper Plateau Stress UPS MPa |
Permanent set after 6% strain % |
Active Af ℃ | ||
| D | ≥1300 | ≥10 | ≥480 | ＜0.5 | +3~+17 | Guidewires, braided stents, stoneretrievers, snares, dental files, IUD, sutrues, etc. |
| C | ≥1150 | ≥10 | ≥440 | ＜0.5 | +10~+24 | |
| S | ≥1000 | ≥10 | ≥400 | ＜0.5 | +20~+30 | |
* All Mechanical Testing Conducted at 22°C+/-2°C per ASTM F2516-18
Nitinol 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 |
Notes: 1) Tighter tolerance available upon request
2) Out of round tolerance shall be one-half the total size tolerance
Wire Surface Status
● Black oxide
● Light oxide（varies from golden yellow to brown）
● Etched
● Shinny
● Gloss®;（ultra shinny surface）
● Centerless ground
Packaging of Wires
● 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;
● Coil
* Other packaging method could be discussed with ZHP Medical.
