MP35N® Wire UNS R30035

MP35N is an age hardenable nickel-cobalt base superalloy that has a unique combination of properties: ultra-high strength, toughness, and ductility. Alloy MP35N is also able to resist stress-corrosion and harsh environments which often leads to its selection as a fastener or spring material, although its uses also include petrochemical equipment, racing engines and medical devices.
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MP35N® Shaped, Flat, Square, Round, Fine Wire, Plated and Un-plated AMS 5758, AMS 5844, AMS 5845, ASTM F562

MP35N Wire Alloy Description

This age hardenable nickel-cobalt base alloy that has a unique combination of properties: ultra- high strength, toughness, ductility and outstanding corrosion resistance. The alloy resists corrosion in hydrogen sulfide, salt water and other chloride solutions with excellent resistance to crevice and stress corrosion cracking in sea water and other hostile environments. Suitable where a high combination of strength, high modulus values and good corrosion resistance are required.


Chemistry Typical

Carbon: 0.02 max
Manganese: 0.15 max
Phosphorus: 0.015 max
Sulfur: 0.010 max
Silicon: 0.15 max
Chromium: 19.00-21.00
Nickel: 33.00-37.00
Molybdenum: 9.00-10.50
Cobalt: Balance
Titanium: 1.00 max
Boron: 0.010 max
Iron: 1.00 max

Physical Properties of MP35N

Density: 0.304 lb/in³, 8.43 g/cm³

Electrical Resistivity: ohm-cir-mil/ft (microhm-mm)
-300°F (-184°C): 593.0 (986.0)
-100°F (-73°C): 608.9 (1011.0)
70°F (21°C): 621.0 (1033.0)
200°F (93°C): 632.0 (1051.0)
400°F (204°C): 648.0 (1078.0)
600°F (316°C): 664.0 (1104.0)
800°F (427°C): 679.0 (1129.0)
1000°F (538°C): 694.0 (1154.0)
1200°F (649°C): 709.0 (1179.0)

Thermal Conductivity: BTU-in/hr-ft²-°F (W/m•K)
-300°F (-184°C): 45 (6.5)
-100°F (-73°C): 63 (9.1)
70°F (21°C): 78 (11.2)
200°F (93°C): 88 (12.7)
400°F (204°C): 104 (15.0)
600°F (316°C): 118 (17.0)
800°F (427°C): 133 (19.2)
1000°F (538°C): 148 (21.3)
1200°F (649°C): 162 (23.4)

Mean Coefficient of Thermal Expansion: µin/in-°F (µm/m-°C)
70-200 °F (21-93°C): 7.11 (12.8)
70-600 °F (21-316°C): 8.22 (14.8)
70-1000 °F (21-538°C): 8.72 (15.7)

Modulus of Elasticity: KSI (MPa)
33.8 x 10³ (232.8 x 10¼) in tension

Melting Range: °F (°C): 2400-2625 (1315-1440)

Mechanical Properties at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 135 KSI (931 MPa)
Yield Strength: 60 KSI (414 MPa)
Elongation: 70 %
Reduction in area: 70%

Cold Reduction: 15 %
Ultimate Tensile Strength: 155 KSI (1069 MPa)
Yield Strength: 118 KSI (814 MPa)
Elongation: 41 %
Reduction in area: 70%
Hardness: Rc 29

Cold Reduction: 25 %
Ultimate Tensile Strength: 170 KSI (1172 MPa)
Yield Strength: 150 KSI (1034 MPa)
Elongation: 28%
Reduction in area: 65%
Hardness: Rc 34

Cold Reduction: 35 %
Ultimate Tensile Strength: 194 KSI (1336 MPa)
Yield Strength: 154 KSI (1062 MPa)
Elongation: 22%
Reduction in area: 65%
Hardness: Rc 42

Cold Reduction: 45 %
Ultimate Tensile Strength: 228 KSI (1572 MPa)
Yield Strength: 189 KSI (1303 MPa)
Elongation: 17%
Reduction in area: 62%
Hardness: Rc 47

Cold Reduction: 55 %
Ultimate Tensile Strength: 265 KSI (1827 MPa)
Yield Strength: 205 KSI (1413 MPa)
Elongation: 12%
Reduction in area: 50%
Hardness: Rc 47

Cold Reduction: 65 %
Ultimate Tensile Strength: 280 KSI (1931 MPa)
Yield Strength: 235 KSI (1620 MPa)
Elongation: 11%
Reduction in area: 49%
Hardness: Rc 50
Properties: Cold Reduced +Aged @ 1000 °F (538°C) for 4 Hrs. Air Cooled

Cold Reduction: 15 % + Aged
Ultimate Tensile Strength: 158 KSI (1089 MPa)
Yield Strength: 125 KSI (862 MPa)
Elongation: 39 %
Reduction in area: 70%
Hardness: Rc 33

Cold Reduction: 25 % + Aged
Ultimate Tensile Strength: 186 KSI (1282 MPa)
Yield Strength: 175 KSI (1207 MPa)
Elongation: 24%
Reduction in area: 65%
Hardness: Rc 39

Cold Reduction: 35 % + Aged
Ultimate Tensile Strength: 203 KSI (1400 MPa)
Yield Strength: 195 KSI (1344 MPa)
Elongation: 21%
Reduction in area: 62%
Hardness: Rc 43

Cold Reduction: 45 % + Aged
Ultimate Tensile Strength: 257 KSI (1772 MPa)
Yield Strength: 251 KSI (1731 MPa)
Elongation: 12%
Reduction in area: 52%
Hardness: Rc 46

Cold Reduction: 53 % + Aged
Ultimate Tensile Strength: 300 KSI (2068 MPa)
Yield Strength: 290 KSI (1999 MPa)
Elongation: 10%
Reduction in area: 48%
Hardness: Rc 50

Additional Properties

Corrosion Resistance

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

Heat Treatment

MP35N® can be hardened by cold working and by cold working + heat treatment


For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”
*MP35N® is an registered trademark of SPS Technologies

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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