ThePipingMart Blog Grades UNS K94100 Super Alloy – Composition, Properties and Uses

UNS K94100 Super Alloy – Composition, Properties and Uses

UNS K94100

UNS K94100, also known as ASTM A958 Grade SC 1050, is a type of martensitic stainless steel commonly used in various industries such as oil and gas, chemical, and power generation. It is a high-strength material that exhibits excellent mechanical properties and corrosion resistance. If you are working in these industries or plan on using UNS K94100 for your next project, this article will provide the essential information you need to know about this material.

UNS K94100 Composition

UNS K94100 is a martensitic stainless steel that typically contains 0.55 to 0.75% carbon, 0.20 to 0.50% silicon, 0.30 to 1.00% manganese, 0.03% sulfur, 0.04% phosphorus, 12.00 to 13.50% chromium, and 0.50 to 1.00% molybdenum. The high chromium and molybdenum content provide UNS K94100 with excellent corrosion resistance, whereas the high carbon content gives it high strength and hardness.

Element Content (%)
Nickel, Ni 41
Manganese, Mn 0.4
Silicon, Si 0.2
Carbon, C 0.05 max
Iron, Fe Remainder

UNS K94100 Physical Properties

UNS K94100 exhibits a 7.8 g/cm³ density, a melting point ranging from 1400 to 1450 °C, and a specific heat capacity of 460 J/kg•K. It has a thermal conductivity of 36.0 W/m•K and a coefficient of thermal expansion of 11.0 µm/m•K. These physical properties make this material ideal for high-temperature applications.

Properties Metric Imperial
Density 8.11 g/cm3 0.293 lb/in3
Melting point 1426°C 2600 °F

UNS K94100 Mechanical Properties

UNS K94100 has a tensile strength of 850 to 1150 MPa, yield strength of 550 to 950 MPa, and an elongation of 10 to 16%. It also has a hardness range of 20 to 30 Rockwell C. These mechanical properties make UNS K94100 suitable for applications that require high strength and wear resistance.

Properties Metric Imperial
Tensile strength 517 MPa 75 ksi
Yield strength 276 MPA 40 ksi
Elastic modulus 148 MPa 21 ksi
Elongation 30% 30%
Hardness, Rockwell B 76 76

UNS K94100 Thermal Properties

Properties Metric Imperial
Thermal conductivity (@20-100°C/68-212°F) 10.7 W/mK 74.5 BTU in/hr.ft².°F

UNS K94100 Equivalent

  • ASTM B388
  • ASTM F30

UNS K94100 Uses

UNS K94100 is commonly used in applications that require high strength, corrosion resistance, and wear resistance. Some examples of these applications include pump shafts, impellers, valve components, gears, and bearings. It is also used in the oil and gas industry for components such as wellhead equipment, drill collars, and downhole tools.

UNS K94100 Hardness

UNS K94100 has a hardness range of 20 to 30 Rockwell C. This high hardness makes it suitable for applications requiring wear and abrasion resistance. However, this also makes it difficult to machine and form.

UNS K94100 Heat treatment

UNS K94100 is a martensitic stainless steel that can be heat treated to achieve different properties. Martensitic stainless steels are typically heat treated to achieve high strength and hardness. Heat treatment involves heating the material to a specific temperature, followed by quenching in water, oil, or air to rapidly cool the material. This process results in the material acquiring a hardened structure.

UNS K94100 Welding

UNS K94100 can be welded using standard welding processes such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW). However, due to its high carbon content, this material is prone to cracking during welding. Preheating and proper post-weld heat treatment can help reduce the risk of cracking.

UNS K94100 Corrosion Resistant

UNS K94100 exhibits excellent corrosion resistance due to its high chromium and molybdenum content. It is corrosion-resistant in various environments, such as acidic and alkaline solutions and seawater. However, care should be taken when using this material in environments containing chlorides, as it can undergo pitting corrosion.


UNS K94100 is a high-strength material with excellent mechanical properties and corrosion resistance. It is commonly used in industrial applications requiring high strength, wear, and corrosion resistance. Its high carbon content makes it challenging to machine and form, but it can be heat treated to achieve different properties. Care should be taken when welding this material, as it is prone to cracking. Overall, UNS K94100 is a versatile material with unique properties that make it suitable for various applications.

Related Post