Shaped, Flat, Square, Round, Fine Wire, Plated and Un-plated Wire ASTM A666, ASTM A240

201 Alloy Description

This austenitic chromium-nickel-manganese stainless alloy was developed mid-century to conserve nickel. Alloy 201 can
be used as an alternative to alloy 301 in some tempered applications. Because of the relatively high yield strength in the annealed condition, the use of alloy 201 is limited in this condition. Alloy 201 is generally used in the tempered condition particularly for springs and fasteners.


Applications

  • Various screening applications
  • Clamps
  • Springs
  • Display racks and food service applications


Chemistry Typical

  • Carbon: 0.15 max
  • Manganese: 5.50- 7.50 max
  • Phosphorus: .060 max
  • Sulfur: 0.030 max
  • Silicon: 0.75 max
  • Chromium: 18.00- 20.00 max
  • Nickel: 3.50- 5.50
  • Nitrogen: 0.25


Physical Properties

Density: 0.283 lbs/in³, 7.81 g/cm³
Electrical Resistivity: microhm-in, microhm-cm: 27.0 (68.5)
Specific Heat: BTU/lbs./°F (kJ/kg/K): 32-212°F (0-100°C): 0.12 (0.50)
Thermal Conductivity, BTU/hr/ft²/ft/°F (W/m/K):
At 212°F (100°C): 9.4 (16.2)
At 932°F (500°C): 12.4 (21.4)
Mean Coefficient of Thermal Expansion, in./in./ °F (µm/m/K)
32 – 212 °F (0 – 100 °C) 8.7 x 10 (15.7)
32 – 600 °F (0 – 315 °C) 9.7 x 10 (17.5)
32 – 1000 °F (0 – 538 °C) 10.2 x 10 (18.4)
32 – 1200 °F (0 – 649 °C) 10.5 x 10 (18.9)
32 – 1600 °F (0 – 871 °C) 11.3 x 10 (20.3)
Modulus of Elasticity, KSI (MPa)
28.6 x 10³(197 x 10³)
Magnetic Permeability, H= 200 Oersteds: Annealed: 1.02 max
Melting Range, °F (°C) – 2550 – 2650 (1399 – 1454)


Mechanical Properties at Room Temperature

Annealed Condition

Ultimate Tensile Strength: 95 KSI min (655 MPA min)
Yield Strength (0.2% Offset): 38 KSI min (260 MPA min)
Elongation: 40%min
Hardness: B95 max


Tempered 1/16 Hard

Ultimate Tensile Strength: 95 KSI min (655 MPA min)
Yield Strength (0.2% Offset): 45 KSI min (310 MPA min)
Elongation: 40% min


Tempered 1/8 Hard

Ultimate Tensile Strength: 100 KSI min (690 MPA min)
Yield Strength (0.2% Offset): 55 KSI min (380 MPA min)
Elongation: 45% min


Tempered 1/4 Hard

Ultimate Tensile Strength: 125 KSI min (860 MPA min)
Yield Strength (0.2% Offset): 75 KSI min (515 MPA min)
Elongation: 25% min


Tempered 1/2 Hard

Ultimate Tensile Strength: 150 KSI min (1035 MPA min)
Yield Strength (0.2% Offset): 110 KSI min (760 MPA min)
Elongation: 15% < 0.15″
18% > 0.15″


Tempered 3/4 Hard

Ultimate Tensile Strength: 175 KSI min (1205 MPA min)
Yield Strength (0.2% Offset): 135 KSI min (930 MPA min)
Elongation: 10% < 0.15″
12% > 0.15″


Tempered Full Hard

Ultimate Tensile Strength: 185 KSI min (1275 MPA min)
Yield Strength (0.2% Offset): 140 KSI min (965 MPA min)
Elongation: 8% < 0.15″
9% > 0.15″


Additional Properties

Corrosion Resistance

Please refer to NACE (National Association of Corrosion Engineers) for recommendations.

Standard Wire Finishes

Extra Clean: Extra clean is also referred to as “bright annealed” or “bright annealed and cold rolled”
Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for decorative applications
Soap (round wire only): Soap is used as a lubricant in the drawing process andis not removed. It acts as a lubricant during customer part forming operation. A soap finish is available in tempered products.
Plated: Many plating options are available.
•Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests.

Forms

Continuous Coils
Cut to lengths
Precision cutting
Cold Forming
Alloy 201 is considered a formable stainless and is often drawn, stamped and headed. It
work hardens easily and should be followed by anneal.


Heat Treatment

Alloy 201 cannot be heat treated.


Welding

Refer SSINA for Welding Recommendations


Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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