301SI Stainless Steel UNS S30116

Type 301Si is an austenitic stainless steel capable of attaining very high strengths while maintaining ductility through cold working.

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Strip, Coil, Foil & Wire, ASTM A666, ASTM A240


Springs, Fasteners, Washers, Zippers, Clips, Clamps, Computer Parts, Stampings


Type 301Si is an austenitic stainless steel capable of attaining very high strengths while maintaining ductility through cold working. It is not hardenable by heat treatment. Type 301Si is non magnetic in the annealed condition and becomes increasingly magnetic when cold worked. 301Si has an increased silicon content over standard 301 and is typically used for "super" high strength applications. The extra silicon allows for even better ductility at high tensile strengths than standard 301. Both are produced to ASTM A666.

Chemistry Typical

Carbon: 0.15 max Manganese: 2.00 max Silicon: 1.3 max Chromium: 16.00-18.00 Nickel: 6.00-8.00 Molybdenum: 0.75 max Phosphorus: 0.040 max Sulfur: 0.030 max Copper: 0.75 max Nitrogen: 0.10 max Iron: Balance

Physical Properties

Density: 0.285 lbs/in3 7 .88 g/cm3

Electrical Resistivity: microhm-in (microhm-cm): 68 °F (20 °C): 27.4 (69.5)

Specific Heat: BTU/lb/° 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)-9.4 x 10·6 (16.9) 32-600 ° F (0-315 °C)-9.9 x 10·6 (17.8) 32 -1000 ° F (0 -538 °C)-10.2 x 10·6 (18.4) 32 -1200 ° F (0 -649 °C)-10.4 x 10·6 (18.7)

Modulus of Elasticity: ksi (MPa) 28.0 x 103 (193 x 103) in tension 11 .2 x 103 (78 x 103) in torsion

Magnetic Permeability: H = 200 Oersteds: Annealed < 1.02 Melting Range: 2250-2590 ° F (1399-1421 °C)


Coil -Strip, Foil, Ribbon Wire -Profile, Round, Flat, Square

Mechanical Properties at Room Temperature

Properties: Typical

Ultimate Tensile Strength: 75 KSI min (515 MPA min) Yield Strength: (0.2% offset): 30 KSI min (205 MPA min) Elongation: 40% Min Hardness: B92 or Equiv. Max

Tempered Condition

301Si is available in the tempered condition. Consult Ulbrich Technical Services for properties.

Additional Properties

Corrosion Resistance

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

Finishes - Strip & Foil

#1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.

#2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process.

# 2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.

#BA- Bright annealed cold rolled and bright annealed

#CBA- Course bright annealed cold rolled matte finish and bright anneal

#2 - Cold Rolled

#2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part. Polished - Various grit finish for specific polish finished requirements.

* Not all finishes are available in all alloys - Contact Ulbrich sales for more information.

Finishes - Wire

XC - Extra clean bright annealed or bright annealed and cold rolled Grease - Ultra-bright finish (for decorative applications) Soap - Soap coating on tempered wire to act as lubricant * Contact Ulbrich Wire for custom finishes.

Cold Forming

301Si is ductile (addition of Silicon makes it more ductile than standard 301) and easily formed but severe forming or multiple operations may require intermediate anneals due to its high work hardening rate. The higher silicon content makes it more ductile at higher strengths than 301 and can be preferred in spring applications.

Heat Treatment

301Si is non hardenable by heat treatment.


For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & 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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