201 stainless steel spring wire

This austenitic chromium-nickel-manganese stainless steel spring wire, known as 201 alloy, was initially developed to conserve nickel. It offers an alternative to alloy 301 in certain tempered applications, with excellent durability and strength for various uses. Due to its relatively high yield strength in the annealed condition, its use in this form is somewhat limited. However, 201 stainless steel spring wire performs exceptionally well in tempered conditions, particularly for applications like springs and fasteners.

Applications
201 stainless steel spring wire is versatile and used across multiple industries. It is ideal for applications such as:

• Various screening and filtration systems
• Clamps
• Springs
• Display racks and food service equipment

Typical Chemistry

• Carbon: Max 0.15
• Manganese: Max 5.50 - 7.50
• Phosphorus: Max 0.060
• Sulfur: Max 0.030
• Silicon: Max 0.75
• Chromium: Max 18.00 - 20.00
• Nickel: 3.50 - 5.50
• Nitrogen: Max 0.25

Physical Properties

• Density: 0.283 lbs/in³ (7.81 g/cm³)
• Electrical Resistivity: 27.0 microhm-in (68.5 microhm-cm)
• Specific Heat: 0.12 BTU/lbs/°F (0.50 kJ/kg/K) at 32-212°F (0-100°C)
• Thermal Conductivity:
  • 9.4 BTU/hr/ft²/ft/°F (16.2 W/m/K) at 212°F (100°C)
  • 12.4 BTU/hr/ft²/ft/°F (21.4 W/m/K) at 932°F (500°C)
• Mean Coefficient of Thermal Expansion:
  • 8.7 x 10⁻⁶ in/in/°F (15.7 µm/m/K) from 32–212°F (0–100°C)
  • 11.3 x 10⁻⁶ in/in/°F (20.3 µm/m/K) from 32–1600°F (0–871°C)
• Modulus of Elasticity: 28.6 x 10³ KSI (197 x 10³ MPa)
• Magnetic Permeability (Annealed): Max 1.02
• Melting Range: 2550–2650°F (1399–1454°C)

Mechanical Properties at Room Temperature

• Annealed Condition:

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

• Tempered Conditions:

  • 1/16 Hard:
    • Ultimate Tensile Strength: Min 95 KSI (655 MPA)
    • Yield Strength (0.2% Offset): Min 45 KSI (310 MPA)
    • Elongation: Min 40%
  • 1/8 Hard:
    • Ultimate Tensile Strength: Min 100 KSI (690 MPA)
    • Yield Strength (0.2% Offset): Min 55 KSI (380 MPA)
    • Elongation: Min 45%
  • 1/4 Hard:
    • Ultimate Tensile Strength: Min 125 KSI (860 MPA)
    • Yield Strength (0.2% Offset): Min 75 KSI (515 MPA)
    • Elongation: Min 25%
  • 1/2 Hard:
    • Ultimate Tensile Strength: Min 150 KSI (1035 MPA)
    • Yield Strength (0.2% Offset): Min 110 KSI (760 MPA)
    • Elongation: 15% (<0.15") / 18% (>0.15")
  • 3/4 Hard:
    • Ultimate Tensile Strength: Min 175 KSI (1205 MPA)
    • Yield Strength (0.2% Offset): Min 135 KSI (930 MPA)
    • Elongation: 10% (<0.15") / 12% (>0.15")
  • Full Hard:
    • Ultimate Tensile Strength: Min 185 KSI (1275 MPA)
    • Yield Strength (0.2% Offset): Min 140 KSI (965 MPA)
    • Elongation: 8% (<0.15") / 9% (>0.15")

201 stainless steel spring wire offers durability, high strength, and a range of temper options to meet specific requirements across industrial applications.