ThePipingMart Blog Grades SAE/AISI 4620 Alloy Steel (UNS G46200) – Composition, Properties and Uses

SAE/AISI 4620 Alloy Steel (UNS G46200) – Composition, Properties and Uses

SAE / AISI 4620 Steel

AISI 4620 is a medium-carbon alloy steel used to produce various mechanical components. UNS G46200 has good strength and wear resistance, as well as excellent machinability and weldability. SAE/AISI 4620 Alloy Steel, also known by its UNS G46200 designation, is a high-strength, low-alloy steel with a unique combination of excellent toughness and wear resistance. Containing high levels of both chromium and nickel, this alloy steel exhibits extraordinary resistance to corrosion and abrasion, making it an ideal choice for a wide range of industrial applications. Characterized by a tensile strength of 620 MPa and a yield strength of 460 MPa, AISI 4620 exhibits great versatility, particularly in heavy machinery and equipment applications. Furthermore, its exceptional machinability and weldability make it a preferred choice for fabricators and machinists. Overall, AISI 4620 Alloy Steel is a top-performing material with high strength and durability and an impressive range of physical properties that make it a must-have for any industrial application. The following article will provide an overview of the properties and uses of 4620 Alloy Steel.

What Forms of AISI 4620 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 4620 Composition

Element Content (%)
Iron, Fe 96.405 – 97.38
Nickel, Ni 1.65 – 2
Manganese, Mn 0.450 – 0.650
Molybdenum, Mo 0.2 – 0.3
Carbon, C 0.170 – 0.220
Silicon, Si 0.150 – 0.350
Sulfur, S  0.04
Phosphorous, P  0.0350

AISI 4620 Physical Properties

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in3
Melting point 1421°C 2590°F

AISI 4620 Mechanical Properties

Properties Metric Imperial
Tensile strength, ultimate 510 MPa 74000 psi
Tensile strength, yield 370 MPa 53700 psi
Modulus of elasticity 190-210 GPa 27557-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel)) 80 GPa 11600 ksi
Poissons ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 31.30% 31.30%
Reduction of area 60.30% 60.30%
Hardness, Brinell 149 149
Hardness, Knoop (converted from Brinell hardness) 169 169
Hardness, Rockwell B 80 80
Hardness, Vickers (converted from Brinell hardness) 155 155
Machinability (hot rolled and cold drawn. Based on 100 machinability for AISI 1212 steel) 65 65

AISI 4620 Equivalent

  • AMS 6294
  • AMS 6294C
  • ASTM A29 (4620)
  • ASTM A322 (4620)
  • ASTM A331 (4620)
  • ASTM A505
  • ASTM A519 (4620)
  • ASTM A535 (4620)
  • ASTM A646 (4620-3)
  • ASTM A752 (4620)
  • ASTM A829
  • SAE J1397 (4620)
  • SAE J404 (4620)
  • SAE J412 (4620)
  • MIL SPEC MIL-S-7493 (A4620)

AISI 4620 Uses

SAE/AISI 4620 is widely used in manufacturing various parts for automotive, agricultural, industrial, and other applications. It can be used to make springs, gears, shafts, axles, pins, rods, nuts, bolts, and other components. It can also be used to manufacture items like construction equipment components such as bulldozers and excavators. Its superior properties make it suitable for many applications where strength and durability are required.

AISI 4620 Uses in Industries

Automotive Industry

AISI 4620 steel is commonly used in the automotive industry for its high strength and wear resistance properties. It is often used in gears, shafts, and other components that require durability and toughness.

Aerospace Industry

The aerospace industry also utilizes AISI 4620 steel for strength and fatigue resistance. It is commonly used in aircraft landing gear components, engine parts, and structural components.

Oil and Gas Industry

The oil and gas industry, AISI 4620 steel is used for drill collars, couplings, and other downhole equipment due to its high tensile strength and corrosion resistance.

Construction Industry

AISI 4620 steel is also used in the construction industry for its high strength-to-weight ratio. It can be found in crane booms, excavator arms, and other heavy machinery components.

Defense Industry

Due to its high impact resistance and toughness, AISI 4620 steel is utilized in the defence industry for military vehicle armour plating and weapon components.

Manufacturing Industry

Various manufacturing processes such as forging, casting, and machining utilize AISI 4620 steel due to its machinability and ability to withstand high stresses without deforming or breaking. It can be found in various products, from tools to industrial equipment.

AISI 4620 Corrosion Resistance

SAE/AISI 4620 has good corrosion resistance and can withstand exposure to certain chemicals without corroding or rusting. It resists wear from acid compounds better than most other steel alloys in its class. However, it should still be treated with care in highly corrosive environments such as those found in chemical processing plants or marine environments.

AISI 4620 Heat Resistance

SAE/AISI 4620 has good heat resistance, making it suitable for high-temperature applications such as engine parts or exhaust systems. It also retains its strength even at high temperatures, so it can withstand extreme conditions without losing its structural integrity. This makes it ideal for use in parts that require heat resistance, such as exhaust manifolds or turbine blades.

AISI 4620 Heat Treatment

Heat treatment is not necessary for SAE/AISI 4620 since it already has good mechanical properties at room temperature. If additional strength or hardness is needed, then quenching and tempering may be used to achieve desired results, but this should only be done after consultation with a qualified materials engineer to ensure that the right process is followed for the best results.

AISI 4620 Machining

is easily machined using standard methods, so no special tools are necessary when manufacturing parts from this material. It machines well without any chips forming on the cutting edges, so there is no need for secondary finishing operations after machining has been completed

AISI 4620 Welding

Welding is possible with SAE/AISI4600, but special precautions must be taken due to its high carbon content, which may cause hardening if welded incorrectly or if temperatures get too high during welding processes such as oxyacetylene welding or gas tungsten arc welding (GTAW). Low hydrogen electrodes should always be used when welding this alloy steel, along with preheating before welding commences to reduce the risk of cracking while cooling down stages afterward.


In conclusion, we have seen that SAE/AISI4600 is medium-carbon alloy steel with excellent mechanical properties, including good strength and wear resistance along with excellent machinability and weldability qualities making it suitable for a wide range of applications across multiple industries requiring highly durable components that will remain strong even under extreme conditions. Its corrosion resistance also makes it suitable for use in chemically-rich environments, although extra care should still be taken when working with this material in these circumstances due to its high carbon content, which could lead to hardening if exposed to excessive temperatures during welding processes. Overall, SAE/Aisi4600 provides a great balance between strength, durability, and affordability, making it an ideal choice for many manufacturers looking for cost-effective solutions without compromising on quality.

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