1、Product introduction
All medical nickel-titanium compositions of Madis alloy comply with the requirements of ASTM F2063-12 or GB 24627-2009 for surgical implantation. Raw materials must undergo qualified third-party inspection to ensure chemical composition, phase transition temperature, material uniformity and micro-structure requirements. High precision diamond drawing die is used to ensure the diameter and surface finish of finished wire.
2、Composition requirements
| Element | content，mass% |
| Ni | 54.5-57.0 |
| C | ≤0.050（500 ppm maximum） |
| Co | ≤0.050（500 ppm maximum） |
| Cu | ≤0.010（500 ppm maximum） |
| Cr | ≤0.010（500 ppm maximum） |
| H | ≤0.005（50 ppm maximum） |
| Fe | ≤0.050（500 ppm maximum） |
| Nb | ≤0.025（250 ppm maximum） |
| N+O | ≤0.050（500 ppm maximum） |
| Ti | allowance |
3、Performance index
| Tensile strengthsb | ≥1000MPa |
| Elongationδ% | ≥10 |
| Upper Platform Stress | ≥400 MPa |
| Residual Deformation% | <0.5 |
| Actual Operation Completion Temperature | -30℃～90℃ |
4、Reference criteria
| GB 24627-2009 | Nickel-Titanium Shape Memory Alloy Processing Materials for Medical Devices and Surgical Implants |
| GB/T 228-2002 | Tensile Test Method for Metal Materials at Room Temperature |
| YYT 0695-2008 | Standard test method for corrosion susceptibility of small implant devices by cyclic potentiodynamic polarization |
| ASTM F2082-16 | Standard for Measuring Phase Transition Temperature of Nickel-Titanium Shape Memory Alloy by Bending and Free Recovery Method |
5、Supply Specification
5.1、Specifications and tolerances for nickel-titanium alloy wire supply
| 0.05-0.15mm | ±0.004mm |
| 0.15-0.26mm | ±0.005mm |
| 0.26-0.35mm | ±0.007mm |
| 0.35-1.0mm | ±0.01mm |
| 1.0-2.0mm | ±0.015mm |
| 2.0-4.0mm | ±0.02mm |
| ≥4.0mm | Negotiate with customers to determine |
| It can be decided according to the special needs of customers. | |
| ≤1.5 mm | ±0.025mm |
| 1.5-6.5 | ±0.050mm |
| 6.5-10 | ±0.075mm |
| Note: Oversize Tolerance and Madison Negotiation | |
6、Notices for Order
According to ASTM F2063-12 or GB 24627-2009, the following information should be provided when inquiring or ordering:
| 6.1 | AF Temperature in Delivery State |
| 6.2 | Dimensions, such as diameters and tolerances, can be negotiated for more stringent tolerances, and half of the diameter tolerances can be selected for non-roundness tolerances |
| 6.3 | Delivery heat treatment state: straightening superelastic state, cold working state, need follow-up heat treatment |
| 6.4 | Delivery surface state: black oxidized state, light oxidized state (from golden to brown), clean state, bright state, abrasive state |
| 6.5 | Mechanical properties: tensile strength and elongation |
| 6.6 | Order Quantity: Weight, Length or Root Number |
7、Packaging
The general packaging of Madison wire is I-wheel packaging. If customers have other packaging requirements, they can negotiate and confirm
