ThePipingMart Blog Grades AISI 4047 Alloy Steel (UNS G40470) – Composition, Properties and Uses

AISI 4047 Alloy Steel (UNS G40470) – Composition, Properties and Uses

AISI 4047 Steel

AISI 4047 steel is a low-medium alloyed steel used for applications such as automotive components, industrial machinery, and more. 4047 Alloy Steel is one of the most widely used materials in the world due to its versatility and unique properties. In this article, we’ll discuss what makes UNS G40470 so special and cover topics such as its uses, corrosion resistance, heat resistance, heat treatment, and machining.

AISI 4047 Composition

Element Content (%)
Iron, Fe 97.87-98.51
Manganese, Mn 0.70-0.90
Carbon, C 0.45-0.50
Molybdenum, Mo 0.20-0.30
Silicon, Si 0.15-0.35
Sulfur, S 0.040
Phosphorous, P 0.035

AISI 4047 Physical Properties

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

AISI 4047 Mechanical Properties

Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Hardness, Brinell 179-229 179-229
Hardness, Knoop (converted from Brinell hardness) 226 226
Hardness, Rockwell B (converted from Brinell hardness) 93 93
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 14 14
Hardness, Vickers (converted from Brinell hardness) 214 214
Machinability (annealed and cold drawn, based on 100 machinability for AISI 1212 steel) 65 65

AISI 4047 Thermal Properties

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

AISI 4047 Equivalent

  • ASTM A29
  • ASTM A331
  • ASTM A519
  • ASTM A752
  • SAE J1397
  • SAE J404
  • ASTM A322
  • SAE J412
  • SAE J770

AISI 4047 Uses

AISI 4047 steel has many uses in various industries. It is commonly used in automotive components since it can withstand high temperatures and has good corrosion resistance. Additionally, it can be found in industrial machineries such as drills, pumps, compressors, and saws due to its high strength and wear-resistance properties. Other common uses include machine parts and tools that require moderate flexibility and strength.

Corrosion Resistance

AISI 4047 steel also offers excellent corrosion resistance compared to other steels due to its chromium content. The chromium helps form an oxide layer on the steel’s surface, preventing further corrosion from occurring on the surface or inside of the material. This makes it ideal for applications where exposure to corrosive elements may be an issue.

Heat Resistance

AISI 4047 steel has very good heat resistance properties thanks to its low carbon content, which helps prevent oxidation when exposed to high temperatures. This makes it suitable for applications such as exhaust systems where temperatures can reach up to 1000 °C (1832 °F).

Heat Treatment

Heat treatment is necessary for certain applications that require specific hardness or toughness levels from the material. Heat treatment involves heating the material up to a certain temperature and then cooling it down rapidly by quenching it in oil or water, which changes its microstructure resulting in improved hardness or toughness depending on the application requirements.


Machining with AISI 4047 steel is relatively easy compared to other steels due to its low carbon content, which allows it to be cut easily with conventional machining tools such as drill bits and end mills. However, care must be taken not to overheat or damage the material during machining operations since this will reduce its strength and integrity over time.


AISI 4047 steel is a versatile material that can be found in many different applications, including automotive components, industrial machinery, machine parts, and tools, among others, due to its excellent corrosion resistance, heat resistance, and machinability properties making it one of the most popularly used materials worldwide today. Proper care during fabrication processes like heat treatment and machining operations can last for years without any issues, making it an invaluable asset for any manufacturing business looking for reliable materials at an affordable cost!

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