Description
Stainless Steel Grade 13-8 Mo is a precipitation-hardening martensitic stainless steel with high strength and excellent corrosion resistance. It is specifically designed for applications requiring high strength, durability, and resistance to extreme environments. This grade is commonly used in aerospace, chemical, and oil and gas industries where performance and reliability are critical.
Chemical Composition
Chromium (Cr): 12.0 - 14.0%
Nickel (Ni): 7.0 - 9.0%
Molybdenum (Mo): 1.75 - 2.25%
Carbon (C): 0.07 - 0.15%
Manganese (Mn): 0.50% Max
Phosphorus (P): 0.04% Max
Sulfur (S): 0.03% Max
Iron (Fe): Balance
Mechanical Properties (Annealed)
Tensile Strength: 1300 - 1600 MPa (190 - 230 ksi)
Yield Strength: 1100 MPa (160 ksi) Min
Elongation: 6% Min (in 50 mm)
Hardness: 30 - 35 HRC (Rockwell Hardness Scale)
Thermal & Physical Properties
Density:7.80 g/cm³
Thermal Conductivity: 25.4 W/m•K
Specific Heat Capacity: 0.50 J/g•K
Melting Point: Approx. 1400 - 1450°C (2550 - 2650°F)
Coefficient of Thermal Expansion: 13.0 x 10^-6 /°C
Other Designations
DIN: X5CrNiMo12-1
AISI: 13-8 Mo
UNS: S13800
BS: 2346 (alternative reference for certain applications)
Fabrication and Heat Treatment
Machining: Can be machined using conventional techniques, though it is more challenging in its hardened state.
Welding: Generally not recommended in the hardened condition; requires pre-heating and post-weld heat treatment if welding is necessary.
Heat Treatment:
Solution Annealing: Heat to 1040 - 1100°C (1900 - 2010°F), followed by rapid quenching.
Aging: Heat to 480 - 700°C (900 - 1300°F) to achieve desired hardness and strength.
Applications
Aerospace: Aircraft components, landing gear, and structural parts.
Chemical Processing: Equipment exposed to corrosive environments.
Oil & Gas: Components in high-pressure and high-temperature environments.
Defense: High-performance parts and equipment requiring high strength and durability.
Supplied Forms
Bars
Forgings
Features
High Strength: Excellent mechanical properties and high tensile strength.
Corrosion Resistance: Good resistance to oxidation and corrosion in severe environments.
Durability: Superior wear resistance and toughness.
Precipitation Hardening: Achieved through heat treatment to enhance mechanical properties.
