ThePipingMart Blog Grades SAE/AISI 4817 Alloy Steel (UNS G48170) – Composition, Properties and Uses

SAE/AISI 4817 Alloy Steel (UNS G48170) – Composition, Properties and Uses

SAE / AISI 4817 Stainless Steel

While many people are familiar with stainless steel, the various types and grades can be confusing. SAE/AISI 4817 is a type of stainless steel that is particularly well-suited for use in applications where corrosion resistance and heat resistance are essential, such as in marine environments or as components in industrial machinery. SAE/AISI 4817 Alloy Steel, also known as UNS G48170, is a highly sought-after material in the industry due to its remarkable composition and properties. This steel alloy is known for its high strength, toughness, and resistance to wear and tear. It is widely used in manufacturing tools, gears, bearings, and other structural components that require superior mechanical properties. The composition of SAE-AISI 4817 steel includes carbon, manganese, silicon, nickel, chromium, and molybdenum, which can withstand high temperatures and pressure. Furthermore, this steel alloy can be easily machined, welded, and heat-treated, making it a popular choice for various industrial applications. Overall, SAE/AISI 4817 Alloy Steel is a top-performing material with exceptional performance and durability. In this blog post, we will explore the uses, corrosion resistance, heat resistance, heat treatment, machining, and welding of AISI 4817 stainless steel.

What Forms of AISI 4817 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 4817 Composition

Element Content (%)
Iron, Fe 94.775-95.85
Nickel, Ni 3.25-3.75
Silicon, Si 0.150-0.300
Carbon, C 0.150-0.200
Manganese, Mn 0.400-0.600
Molybdenum, Mo 0.200-0.300
Sulfur, S ≤ 0.0400
Phosphorous, P ≤ 0.0350

AISI 4817 Physical Properties

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

AISI 4817 Mechanical Properties

Properties Metric Imperial
Compressive yield strength (1585 MPa mean, gears with case depth 1.1 to 1.5 mm, 60 HRC min. case hardness) 1795 MPa 260300 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
Hardness, Brinell (hot rolled and cold drawn) 187-229 187-229
Hardness, Knoop (converted from Brinell hardness) 230 230
Hardness, Rockwell B (converted from Brinell hardness) 94 94
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 15 15
Hardness, Vickers (converted from Brinell hardness) 218 218
Machinability (hot rolled and cold drawn. Based on 100 machinability for AISI 1212 steel) 60 60

AISI 4817 Thermal Properties

Properties Metric Imperial
Thermal conductivity (typical steel) 44.5 W/mK 309 BTU in/hr.ft².°F

AISI 4817 Equivalent

SAE J1397 SAE J404 SAE J412 ASTM A304 SAE J770

AISI 4817 Uses

UNS G48170 Steel is often used in applications where corrosion resistance and heat resistance are needed. This type of stainless steel is particularly popular for use in marine environments due to its excellent corrosion-resistance properties. It can also be found as components in industrial machinery such as pumps, valves, and fasteners.

AISI 4817 Uses in Industries

Automotive Industry

One of the most common uses of AISI 4817 steel is in the automotive industry. This type of steel is often used to make engine components, such as gears and bearings, due to its high strength and wear resistance. It is also used in suspension systems and other critical parts that require durability and toughness.

Aerospace Industry

AISI 4817 steel is also commonly used in the aerospace industry for its high strength-to-weight ratio. It is often used in aircraft landing gear, engines, and structural components. Its ability to withstand high temperatures makes it suitable for jet engines.

Oil and Gas Industry

In the oil and gas industry, AISI 4817 steel is used for drilling equipment, valves, and other components that require high strength and corrosion resistance. Its ability to withstand harsh environments, such as high pressure and corrosive fluids, makes it a popular choice for this industry.

Construction Industry

AISI 4817 steel is also utilized in the construction industry for its high tensile strength and durability. It can be found in building structures, bridges, and other infrastructure projects where strength and reliability are crucial. Its corrosion resistance also makes it a suitable choice for outdoor applications.

Medical Equipment Industry

Another less common but important use of AISI 4817 steel is in the medical equipment industry. This type of steel is often used to make surgical instruments due to its biocompatibility and resistance to corrosion from bodily fluids. Due to its strength and durability, it can also be found in medical devices such as implants or prosthetics.

AISI 4817 Corrosion Resistance

One of the most appealing features of SAE / AISI 4817 stainless steel is its excellent corrosion-resistance properties. This type of stainless steel has an especially high chromium content which helps it resist oxidation and offers protection against rusting. Additionally, this chromium content helps prevent pitting or staining when exposed to certain chemicals or corrosive materials.

AISI 4817 Heat Resistance

The high chromium content present in SAE/AISI 4817 also makes it highly resistant to elevated temperatures up to 1700°F (930°C). This makes it a great choice for applications that require both corrosion-resistance properties and high-temperature resistance.

AISI 4817 Heat Treatment

SAE/AISI 4817 can be used in applications that require heat treatment, such as tempering or annealing. In order to achieve optimal results with heat treating this type of stainless steel, it’s important to adhere to strict guidelines regarding temperature ranges and time frames. For example, tempering should take place at temperatures between 1000°F (540°C) – 1500°F (815°C).

AISI 4817 Machining

SAE/AISI4817 can be machined using conventional tools such as drills, saws, taps, etc. However, due care must be taken when machining this type of stainless steel as it tends to work harden quickly if not properly lubricated during the machining process. Additionally, because this material has a higher carbon content than other types of stainless steel, it may require slower cutting speeds than what would normally be used for other materials.

AISI 4817 Welding

SAE/AISI 4817 is an alloy steel used in welding applications, as it has a good combination of high strength, ductility, and toughness. It has excellent weldability, with superior notch toughness making it suitable for fabrication with many different welding processes such as gas tungsten arc welding (GTAW), metal arc welding (MIG/MAG), flux cored arc welding (FCAW) and submerged arc welded joints. Its impressive mechanical properties, including impact and corrosion resistance, make it great for use in projects where longevity and durability are paramount. Due to its high strength-to-weight ratio, SAE/AISI 4817 is ideal for use in components and structures where weight reduction without compromising strength or hardness is required.


In conclusion, UNS G48170 is an alloy steel used for a wide variety of applications in many different industries. It has desirable properties including excellent mechanical strength, wear resistance, and formability. These qualities make it suitable for uses such as structural components, automotive parts, medical implants and equipment, food processing equipment and offshore drilling rigs. While the alloy has a high carbon content which makes it vulnerable to corrosion unless coated or engaged with proper sealants and maintenance protocols are followed; with proper surface treatments, it is highly resistant to degradation due to environmental conditions. Ultimately, SAE/AISI 4817 Alloy Steel offers potential users multiple advantages and should be seriously considered when looking for a material to use in their operations.

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