ThePipingMart Blog Grades AISI 8630 Alloy Steel (UNS G86300) – Composition, Properties, Uses

AISI 8630 Alloy Steel (UNS G86300) – Composition, Properties, Uses

AISI 8630

AISI 8630 is a low-alloy steel commonly used in the manufacturing industry. This type of steel offers good strength and toughness, making it a great option for both structural and nonstructural applications. AISI 8630 Alloy Steel, also known as UNS G86300, is a widely used type of low alloy steel that exhibits excellent toughness and ductility. This steel alloy is known for its high resistance to wear, strength, and hardness properties, making it suitable for various applications in the automotive, aerospace, and oil and gas industries. AISI 8630 Steel is composed of nickel, chromium, and molybdenum, which gives it its distinctive mechanical and chemical characteristics. Although it is commonly mentioned in the context of weight reduction and corrosion resistance, AISI 8630 steel equivalent has a strength-to-weight ratio near that of steels and a cost-to-benefit ratio that makes it a valuable material to use for both industrial and commercial purposes. In this blog post, we will discuss the uses, corrosion resistance, heat resistance, heat treatment, and machining of AISI 8630.

What Forms of AISI 8630 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 8630 Composition

Element Content (%)
Iron, Fe 96.745-98.02
Manganese, Mn 0.650-0.950
Chromium, Cr 0.400-0.600
Nickel, Ni 0.350-0.750
Carbon, C 0.280-0.330
Silicon, Si 0.150-0.300
Molybdenum, Mo 0.150-0.250
Sulfur, S ≤ 0.0400
Phosphorous, P ≤ 0.0350

AISI 8630 Physical Properties

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

AISI 8630 Mechanical Properties

Properties Metric Imperial
Tensile strength 620 MPa 89900 psi
Yield strength (@strain 0.200%) 550 MPa 79800 psi
Fatigue strength (unnotched limit) 315 MPa 45700 psi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (estimated from elastic modulus) 72.0 GPa 10400 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) 16.00% 16.00%
Hardness, Knoop (converted from Vickers hardness) 230 230
Hardness, Rockwell C (converted from Vickers hardness, value below normal HRC range, for comparison only) 15 15
Hardness, Vickers 217 217
Machinability (annealed and cold drawn, based on AISI 1212 steel, as 100 average machinability) 70 70

AISI 8630 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@21-100°C/69.8-212°F) 11.2 µm/m°C 6.22 µin/in°F
Thermal conductivity (typical steel) 46.6 W/mK 323 BTU in/hr.ft².°F

AISI 8630 Equivalent

AMS 6280 AMS 6281 AMS 6530 AMS 6535 AMS 7496
ASTM A752 ASTM A829 MIL S-18728 MIL S-6050 SAE J1397
SAE J404 SAE J404 SAE J412 AMS 6280E AMS 6281C
AMS 6355 AMS 6355G AMS 6530E AMS 6550 AMS 6550E

AISI 8630 Uses

AISI 8630 is a versatile material that can be used in a variety of applications. It is often used for connecting rods, crankshafts, gears, pins and shafts due to its superior strength and fatigue properties. Additionally, it exhibits excellent machinability, which makes it ideal for components that require intricate detail. It also has good weldability, which allows it to be used in various types of welding processes, such as gas tungsten arc welding (GTAW), shielded metal arc welding (SMAW), and gas metal arc welding (GMAW).

AISI 8630 Uses in Industries

  • Aerospace Industry
  • Oil and Gas Industry
  • Automotive Industry
  • Defense Industry
  • Construction Industry

AISI 8630 Corrosion Resistance

AISI 8630 offers good corrosion resistance in mildly corrosive environments. Its low carbon content helps reduce the risk of stress corrosion cracking, while its nickel content increases the material’s ability to resist rusting when exposed to moisture or other corrosive elements. Additionally, AISI 8630’s chromium content provides additional protection against oxidation at elevated temperatures.

AISI 8630 Heat Resistance

AISI 8630 has excellent heat resistance making it suitable for high-temperature environments such as oil refineries and power plants where temperatures can reach up to 600°F (316°C). The high-temperature strength is maintained even after long exposure periods due to its low carbon content, which reduces the risk of thermal expansion or embrittlement at elevated temperatures.

AISI 8630 Heat Treatment

AISI 8630 can be heat treated using normalizing or annealing processes depending on the desired properties needed for the application. Normalizing involves heating the material until it reaches about 1,650°F (899°C) and then allowing it to slowly cool in still air, whereas annealing requires heating until 1,550°F (843°C) and then cooling rapidly with water or oil quenching process followed by tempering for increased hardness or improved machinability characteristics.

AISI 8630 Machining

AISI 8630 is easy to machine with conventional tooling thanks to its good machinability rating of 80%. It can also be drilled with standard twist drills and cut with hacksaw blades without difficulty; however, carbide tools are recommended if higher precision is required. When machining this material, it is important to use sharp tools as dull ones will cause excessive chatter marks on the finished product surface finish, which could potentially reduce its lifespan in service applications. Additionally, attention should be paid when cutting near edges as this can cause cracking due to localized stresses formed during cutting operations.


AISI 8630 is a versatile material that offers superior strength and toughness, making it ideal for structural and nonstructural applications alike. Its low carbon content allows for increased corrosion resistance, while its nickel content provides added protection from rusting when exposed to moisture or other corrosive agents. Additionally, its chromium content gives additional oxidation protection at elevated temperatures while its good machinability ensures precise details are easily attainable during fabrication processes like drilling or cutting operations. Finally, its excellent heat resistance makes it suitable for high-temperature environments such as oil refineries or power plants where temperatures may reach up to 600°F (316°C). By understanding all these features, you will be able to make an informed decision when choosing materials for your next project!

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