AISI 4815 Alloy Steel (UNS G82150)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Forging
     Cold Working
     Annealing
     Tempering

Introduction

Alloy steels are designated by AISI four-digit numbers. They are more responsive to heat and mechanical treatments than carbon steels. They comprise various types of steels having compositions which exceed the limitations of Va, Cr, Si, Ni, Mo, C and B in the carbon steels.

The following datasheet provides more details about AISI 4815 alloy steel, which can be heat treated to obtain good ductility and core strength.

Chemical Composition

The chemical composition of AISI 4815 alloy steel is listed in the following table.

Element Content (%)
Iron, Fe
Balance
Carbon, C 0.13-0.18
Manganese, Mn 0.40-0.60
Phosphorous, P 0.035 (max)
Sulfur, S 0.04 (max)
Silicon, Si 0.15-0.30
Nickel, Ni 3.25-3.75
Molybdenum, Mo 0.20-0.30

Physical Properties

The following table shows the physical properties of AISI 4815 alloy steel.

Properties Metric Imperial
Density 7.7 – 8.03 g/cm3 0.278 – 0.290 lb/in³
Melting point 1427ºC 2600ºF

Mechanical Properties

The mechanical properties of AISI 4815 alloy steel are outlined in the following table.

Properties Metric English
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30

Other Designations

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Other designations that are equivalent to AISI 4815 alloy steel include the following:

  • ASTM A29
  • ASTM A322
  • ASTM A331
  • ASTM A519
  • ASTM A752
  • SAE J1397
  • SAE J404
  • SAE J412
  • ASTM A505
  • SAE J770

Fabrication and Heat Treatment

Machinability

AISI 4815 steel can be easily machined in annealed or normalized conditions.

Forming

Forming of AISI 4815 steel can be performed using conventional methods in annealed or normalized conditions.

Welding

AISI 4815 steel has welding property.

Heat Treatment

AISI 4815 steel is normalized at 927ºC (1700ºF) prior to heat treatment. This steel is hardened or carburized at 927ºC (1700ºF) and then oil quenched.

Forging

Forging of AISI 4815 steel is performed at temperatures ranging from 982 to 1177ºC (1800 to 2150ºF).

Cold Working

AISI 4815 steel can be easily cold worked using conventional methods as the ductility of the steel is good in annealed or normalized conditions.

Annealing

AISI 4815 steel can be annealed at 857ºC (1575ºF) and then slow furnace cooled at a rate not more than 10ºC (50ºF) per hour followed by air cooling.

Tempering

Tempering of AISI 4815 steel can be done at 149 to 649ºC (300 to 1200ºF).

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