15-7 MO® Stainless Steel Wire UNS S15700

15-7Mo® is a precipitation-hardening semi-austenitic stainless steel that provides high strength and hardness, good corrosion resistance and minimum distortion upon heat treatment.

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Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire AMS 5520, ASTM A693

15-7Mo® Alloy Description

15-7Mo® is a precipitation-hardening semi-austenitic stainless steel that provides high strength and hardness, good corrosion resistance and minimum distortion upon heat treatment. It is easily formed in the annealed condition and develops an effective balance of properties by simple heat treatments. For applications requiring exceptionally high strength, cold-reduced 15-7Mo Stainless Steel in Condition CH 900 is particularly useful for applications permitting only limited ductility and workability. This alloy is particularly beneficial for applications requiring high strength at elevated temperatures.


Chemistry Typical

  • Carbon: 0.090 max
  • Manganese: 1.00 max
  • Silicon: 1.00 max
  • Chromium: 14.00-16.00
  • Nickel: 6.50- 7.75
  • Molybdenum: 2.00-3.00
  • Aluminum: 0.75-1.50
  • Phosphorus: 0.040 max
  • Sulfur: 0.040 max
  • Iron: Balance

Physical Properties

Density: (Cond. A), 0.280 lbs/in³, 7.80 g/cm³

Thermal Conductivity: BTU/hr/ft²/in/°F (W/m•K):

At 200°F (93°C): 112 (16.2)

Mean Coefficient of Thermal Expansion (Cond. A):in/in/°F (μm/m•K)
70-200°F (21-93°C): 8.0 x 10 (14.4)
70-600°F (21-315°C): 8.5x 10 (15.3)
70-800°F (21-427°C): 8.9x 10 (16.0)

Magnetic Permeability:

Annealed: Weak ferromagnetic

Heat Treated: Strong ferromagnetic

Modulus of Elasticity: KSI (MPa)
29.0 x 10³ (200 x 10³) in tension

Mechanical Properties at Room Temperature

Properties: Annealed

Ultimate Tensile Strength: 150 KSI max (1035 MPa max)
Yield Strength (0.2% offset): 55 KSI max (380 MPa max)
Elongation: 20% min
Hardness: Rb 92 max

Properties: Tempered for Annealed Condition

15-7MO® can be cold rolled to various tempers. Contact Ulbrich Technical Service for additional information

Properties: Condition C

Ultimate Tensile Strength: 200 KSI min (1380 MPa min)
Yield Strength (0.2% offset): 175 KSI min (1205 MPa min)
Elongation: 1% min
Hardness: Rc41 min

Properties Tempered for Condition C

15-7MO® can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Heat Treat Capabilities

15-7MO® can be heat treated conditions. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance

Corrosion resistance of 15-7MO® stainless steel in Conditions TH 1050 and RH 950 is superior to that of the standard hardenable chromium types of stainless steels such as alloys 410, 420 and 431, but is not quite as good as chromium-nickel alloy 304. Refer to NACE (National Association of Corrosion Engineers) for recommendations.

Standard Wire Finishes

Extra Clean: (XC) 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 and is 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.


  • Continuous Coils
  • Cut to lengths
  • Precision cutting


15-7MO® can be hardened by:
Heat treatment from “Condition A” (RH950 or TH1050)
Cold rolling: Condition 1/2 C, 3/4 C, C
Heat treatment of Condition C (CH900)

Welding 15-7 Mo

For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods.” 15-7MO® is a registered trademark of AK Steel Corporation.

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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