ThePipingMart Blog Grades AISI 8650 Alloy Steel (UNS G86500) – Composition, Properties and Uses

AISI 8650 Alloy Steel (UNS G86500) – Composition, Properties and Uses

AISI 8650 Steel

If you are looking for durable and reliable steel. Then AISI 8650 is the right choice. This metal is an excellent choice for many applications because it offers great corrosion resistance. It also has high corrosion resistance. Making it ideal for heavy machinery use. With its impressive strength-to-weight ratio and high impact resistance. AISI 8650 alloy steel is an excellent choice for various industrial applications. Let’s look closer at UNS G86500 alloy, Examining its performance, Corrosion resistance, Heat resistance, Heat treatment and machining.

What Forms of AISI 8650 is Available at Piping Mart?

  • Nut
  • Bar
  • Bolt
  • Pipe
  • Screw
  • Tubing
  • Valves
  • Washers
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Pipe Fittings
  • Forged Fitting
  • Instrumentation Fittings

AISI 8650 Chemical Composition

AISI 8650, categorized as a low-alloy steel, possesses a chemical makeup that includes carbon, manganese, chromium, nickel, molybdenum, and several other elements. Purposefully designed, this alloy is crafted to fulfill applications requiring high strength and toughness. The precision in its composition ensures a harmonious balance among these elements, ensuring optimal mechanical properties. Consequently, AISI 8650 emerges as a dependable choice across various industrial applications, particularly in demanding scenarios such as gears and shaft applications.

Element Content (%)
Iron, Fe 96.54-97.67
Manganese, Mn 0.750-1.00
Carbon, C 0.480-0.530
Nickel, Ni 0.400-0.700
Chromium, Cr 0.400-0.600
Silicon, Si 0.150-0.300
Molybdenum, Mo 0.150-0.250
Sulfur, S ≤ 0.0450
Phosphorous, P ≤ 0.0350

AISI 8650 Physical Properties

AISI 8650 exhibits specific physical properties, with density being a defining characteristic. The density of AISI 8650, representing its mass per unit volume, plays a crucial role in determining its overall strength and suitability for various industrial applications, ensuring optimal performance in demanding conditions.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

AISI 8650 Mechanical Properties

Properties Metric Imperial
Tensile strength 715 MPa 104000 psi
Yield strength 385 MPa 55800 psi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80.0 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 22.50% 22.50%
Hardness, Brinell 212 212
Hardness, Knoop (converted from Brinell hardness) 235 235
Hardness, Rockwell B (converted from Brinell hardness) 94 94
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison only) 16 16
Hardness, Vickers (converted from Brinell hardness) 223 223
Machinability (annealed and cold drawn, based on 100 machinability for AISI 1212 steel) 60 60

AISI 8650 Thermal Properties

Properties Metric Imperial
Thermal conductivity (typical steel) 46.6 W/mK 323 BTU in/hr.ft².°F

AISI 8650 Equivalent

AISI 8650 alloy steel is equivalent to SAE 8650 and features nickel, chromium, and molybdenum composition. Renowned for its high strength and wear resistance, it’s commonly used in tough and durable applications. The alloy’s heat-treatable nature allows for varied hardness levels. Employed in gears, shafts, and other components subject to heavy loads, AISI 8650 offers reliable performance. Its versatile characteristics make it suitable for diverse industrial uses, ensuring reliability in demanding conditions.

  • ASTM A322
  • ASTM A505
  • ASTM A519
  • SAE J404
  • SAE J412
  • SAE J770

AISI 8650 Uses

AISI 8650 stands out as a widely favored steel across various industries. Valued for its robustness, enduring quality, and adaptability. This high-carbon alloy finds utility in diverse applications. Including automotive components, agricultural machinery, industrial equipment, and tools. Its prevalence extends to crucial machine parts like shafts, spindles, gears, and axles, where high strength is paramount. The versatility of AISI 8650 makes it a key player in crafting durable and resilient solutions for numerous industrial needs.

AISI 8650 Uses in Industries

  • Automotive Industry
  • Marine Industry
  • Aerospace Industry
  • Construction Industry
  • Electrical Industry

AISI 8650 Corrosion Resistance

AISI 8650 steel offers a major advantage with its outstanding corrosion resistance. It’s remarkable oxidation properties make it resilient against corrosion, even in challenging conditions like extreme temperatures or high-humidity environments with exposure to saltwater. Additionally, this steel showcases impressive wear resistance. Making it a reliable choice for applications where wear and tear are prevalent.

AISI 8650 Heat Resistance

AISI 8650 has an incredibly high melting point making it ideal for use in hot environments or applications. That are exposed to extremely high temperatures. This alloy also has great thermal properties, which make it suitable for use as a material in furnaces or other hot processing operations. Additionally, this steel maintains its structural integrity even when exposed to very high temperatures. Making it ideal for use in extreme environments such as Aerospace or Power plants.


Overall, AISI 8650 offers superior strength and durability compared to other steels on the market today. Its excellent corrosion resistance makes it suitable for use in many different industries. Including Automotive manufacturing, Agricultural equipment manufacturing, and industrial machinery production. Additionally, its heat-resistant qualities make it ideal for hot working operations or extreme environmental conditions such as aerospace engineering or power plant construction projects. While its machinability features make it easy to shape into complex shapes without sacrificing any strength or durability characteristics. All these features make AISI 8650 one of the most sought-after alloys on the market today!

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