This specification covers the information typically necessary to purchase Chrome Doped Nitinol #2 round wires with a diameter ≥ 0.001" (0.025 mm) and ≤ 0.040" (1.016 mm).
|NiTi#2-CW||Nitinol #2 Cold Worked|
|NiTi#2-SE||Nitinol #2 Super-Elastic Straight Annealed|
Add desired suffix to select oxide finish as described below in
|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 F2516||Standard Test Method for Tension Testing of Nickel-Titanium Super-Elastic Materials|
The chemical composition of the material shall be equal to or better than those defined by ASTM F2063 with the exception of the chromium content, which is higher than the .01% maximum ASTM specification. FWM meets or exceeds the following chemical composition requirements:
|Chromium||0.20 to 0.30 (exceeds ASTM F2063: .01% max.)|
|Carbon||< 0.05 (500 PPM maximum)|
|Nitrogen plus Oxygen||< 0.05 (500 PPM maximum)|
|Iron||< 0.05 (500 PPM maximum)|
|Copper||< 0.01 (100 PPM maximum)|
|Cobalt||< 0.05 (500 PPM maximum)|
|Hydrogen||< 0.005 (50 PPM maximum)|
|Niobium||< 0.025 (250 PPM maximum)|
|Any Single Trace Element||< 0.1 (except Chromium)|
|Total Trace Elements||< 0.4 (except Chromium)|
The fully annealed ingot austenite start (As) temperature shall be (-45)°C to (-15)°C when measured by DSC in accordance with ASTM F2004.
Materials ordered in the Super-Elastic Straight Annealed (NiTi#2-SE) condition will have a finish Af temperature between +0°C to +18°C when tested per FWM procedures.
(in accordance with ASTM A-555)
|Specified Size (inches)||Standard Tolerance (inches)|
1) Tighter tolerance available upon request.
2) Out of round tolerance shall be one-half the total size tolerance
|0.035 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|
All Mechanical Testing Conducted at 22°C ±2°C
The cold worked wire shall conform to the following mechanical properties:
|Cold Work||45% ±5%|
|Ultimate Tensile Strength||250,000 PSI minimum|
|Tensile Elongation at Failure||4% minimum (as measured by the above referenced document)|
|Ultimate Tensile Strength||> 210,000 PSI|
|Elongation at Break||> 10%|
|Loading Plateau||> 80,000 PSI at 4% strain|
|Unloading Plateau||> 35,000 PSI at 4% strain (after an initial strain to 8%)|
|Permanent Set after 8% Strain and Unloading||< 0.5%|
|Description||Order Code Suffix||Appearance|
|Eched and Mechanically Polished||EMP||Silver|
|Etched Bright||E||Bright Silver|
|Light Oxide||LO||Gold to Brown|
|Dark Oxide||DK||Blue to Black|
|Black Oxide||BLK||Shiny Black|
Wire must be clean of contaminants, smooth, free from bumps, kinks, waves, scrapes, splits, burrs and other surface defects.
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.
A certificate of compliance to this product number shall accompany each shipment.
Each spool shall be labeled with the:
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|
|0.0007" 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|