Nitinol #1 Wire

This specification covers all necessary information for the purchasing of Nitinol #1 round wires having a diameter ≥ 0.001" (0.025 mm) and ≤ 0.040" (1.016 mm).

Product Definition

NiTi#1-CW	Nitinol #1 Cold Worked
NiTi#1-SE	Nitinol #1 Super-Elastic Straight Annealed

Add desired suffix to select oxide finish as described below in Surface Finishes.

Applicable Documents

ASTM A555	Standard Specification for General Requirements for Stainless Steel Wire and Wire Rods
ASTM F2005	Standard Terminology for Nickel-Titanium Shape Memory Alloy
ASTM F2004	Standard Test Method for Transformation Temperature of Nickel-Titanium Alloys by Thermal Analysis
ASTM F2063	Standard Specification for Wrought Nickel-Titanium Shape Memory Alloys for Medical Devices and Surgical Implants
ASTM F2516	Standard Test Method for Tension Testing of Nickel-Titanium Super-Elastic Materials
Doc. #3.34.09	FWM Measurement Procedure of Finish A_f Temperature (FWM internal proprietary document)

Chemical Composition

The chemical composition of the material shall be equal to or better than those defined by ASTM F2063. FWM meets or exceeds the following chemical composition requirements:

Chemical Composition
Element	weight %
Nickel	54.5 to 57.0 (Reference)
Titanium	Balance
Carbon	< 0.05 (500 PPM maximum)
Cobalt	< 0.05 (500 PPM maximum)
Copper	< 0.01 (100 PPM maximum)
Chromium	< 0.01 (100 PPM maximum)
Hydrogen	< 0.005 (50 PPM maximum)
Iron	< 0.03 (300 PPM maximum)
Niobium	< 0.025 (250 PPM maximum)
Oxygen	< 0.05 (500 PPM maximum)
Any Single Trace Element	< 0.1
Total Trace Elements	< 0.25

Transformation Properties

The fully annealed ingot austenite start (A_s) temperature shall be (-35)°C to (-10)°C when measured by DSC in accordance with ASTM F2004.

Materials ordered in the Super-Elastic Straight Annealed (NiTi#1-SE) condition will have a finish A_f temperature between +10°C to +18°C when tested per FWM Doc. #3.34.09.

Applicable Wire Sizes and Standard Tolerances

(in accordance with ASTM A-555)

Wire size and standard tolerances
Specified Size (inches)	Standard Tolerance (inches)
Notes: 1) Tighter tolerance available upon request. 2) Out of round tolerance shall be one-half the total size tolerance
0.040 to 0.033	± 0.0008
< 0.033 to 0.024	± 0.0005
< 0.024 to 0.012	± 0.0004
< 0.012 to 0.008	± 0.0003
< 0.008 to 0.0048	± 0.0002
< 0.0048 to 0.001	± 0.0001

Mechanical Properties

All Mechanical Testing Conducted at 22°C ±2°C

Cold Worked Wire (NiTi#1-CW)

The cold worked wire shall conform to the following mechanical properties:

Mechanical Properties
Cold Work	45% ±5%
Ultimate Tensile Strength	200,000 PSI minimum
Tensile Elongation at Failure	4% minimum (as measured by the above referenced document)

Super-Elastic Wire (NiTi#1-SE)

Mechanical Properties
Ultimate Tensile Strength	180,000 PSI
Elongation at Break	> 10%
Loading Plateau	> 70,000 PSI at 4% strain
Unloading Plateau	> 20,000 PSI at 4% strain (after an initial strain to 8%)
Permanent Set after 8% Strain and Unloading	< 0.5%

Surface Finish and Appearance

Surface Finishes
Order Code Suffix	Description	Appearance
-EMP	Eched and Mechanincally Polished	Bright
-E	Etched Bright	Bright
-LO	Light Oxide	Gold to Brown
-P	Pickled	Dull Matte
-DK	Dark Oxide	Blue to Black
-BLK	Black Oxide	Shiny Black

Wire must be clean of contaminants, smooth, free from bumps, kinks, waves, scrapes, splits, burrs and other surface defects.

Quality Assurance Provisions

Each lot of material is to be manufactured from a single source of raw material under known process conditions.

Supplier will be notified of any revision changes to this specification.

Certification and Spool Labeling

A certificate of compliance to this product number shall accompany each shipment.

Each spool shall be labeled with the:

Product Type
FWM Manufacturing or Production #
Heat #
FWM Part #
Size
Feet or Pounds (as applicable)

Packaging

The wire must be wound evenly on the spools, with no breaks or tangles.

The maximum weight per spool shall be as follows unless specified otherwise on the purchase order.

Wire Size	Maximum Weight	Spool Type
0.001" to 0.003"	0.5 pounds	2.5"x3", Din 80, Din 100, Din 125, Steeger, NE #2, Wardwell Bobbins
> 0.003" to < 0.012"	5 pounds	2.5"x3", Din 100, Din 125, Weldwire Reel
> 0.012" to 0.018"	10 pounds	Weldwire Reel
>0.018" to 0.035"	20 pounds	Weldwire Reel