SAE J404 AISI 4815 Introduce

SAE J404 (Steel, Carbon and High-Strength, Low Alloy – Chemical Composition Limits) is a standard created by the Society of Automotive Engineers (SAE) that outlines the limits for chemical composition of carbon and alloy steel. This standard is used as a reference for specifying automotive steel grades that are produced for various applications, especially for use in parts like engine blocks and crankshafts.

Smelting temperature:1383°C - 1989°C

Application:Chemical compositions of SAE alloy steels

SAE J404 AISI 4815 Material Chemical Composition

The chemical composition of the SAE J404 AISI 4815 steel are as follows:

ElementMinMax
Carbon (C)0.13000.1800
Manganese (Mn)0.40000.6000
PhOsphorus (P)-0.0350
Sulfur (S)-0.0400
Silicon (Si)0.15000.3500
Nickel (Ni)3.25003.7500
Chromium (Cr)-0.2000
Molybdenum (Mo)0.20000.3000
Copper (Cu)-0.3500
PhOsphorus (P)-0.0400
PhOsphorus (P)-0.0250
Sulfur (S)-0.0250
Silicon (Si)0.15000.3000
Sulfur (S)-0.0500
Manganese (Mn)0.30001.0000
Carbon (C)0.10000.2500
Chromium (Cr)-0.2000
Copper (Cu)-0.3500

SAE J404 AISI 4815 Material Mechanical Properties

SAE J404 AISI 4815 steel has good strength and hardness. It has a hardness range of 166 to 287 Brinell, a tensile strength range of 890 to 1340 MPa, a yield strength range of 870 to 1240 MPa, and an ultimate tensile strength range of 1040 to 1450 MPa. It has an elongation rate of 16 to 20 percent in 50 mm and a Poisson's ratio range of 0.26 to 0.30. SAE J 404 steel also has good toughness and ductility and can be easily machined and formed.

The mechanical properties of the SAE J404 AISI 4815 steel are as follows:

YieldRp0.2 ≤ 117 (MPa)
TeileRm≤ 137 (MPa)
ImpactKV/Ku34(J)
ElongationA33%
Reduction in cross section on fractureZ32%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)421

SAE J404 AISI 4815 Material Thermal Properties

The thermal performance parameters of the SAE J404 AISI 4815 steel are as follows:

Temperature (°C)32362691
Modulus of elasticity (GPa)-734-
Mean coefficient of thermal expaion ×10-6/(°C)--33
Thermal conductivity (W/m·°C)-23.332.2
Specific thermal capacity (J/kg·°C)-141-
Specific electrical resistivity (Ω mm²/m)0.14--
Deity (kg/dm³)--334
Poisson’s coefficient, ν--431

SAE J404 AISI 4815 Material Machining Technology

SAE J404 AISI 4815 steel is an important engineering material with many excellent properties, making it a preferred choice for many machining and fabrication applications. However, machining SAE J404 AISI 4815 steel presents a number of challenges due to its combination of high hardness, strength and ductility.