SAE J404 87L42 Introduce
The SAE J404 standard is a comprehensive set of specifications for a variety of steel grades. The standard covers the chemical composition, physical properties, forming, heat treating, and other characteristics necessary for steel to be used in vehicle components. The purpose of the standard is to ensure the proper selection and use of steel for automotive applications.
Smelting temperature:1353°C - 1218°C
Application:Chemical compositions of SAE alloy steels
SAE J404 87L42 Material Mechanical Properties
SAE J404 87L42 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 87L42 steel are as follows:
| YieldRp0.2 | ≤ 653 (MPa) |
| TeileRm | ≤ 753 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 142 |
SAE J404 87L42 Material Thermal Properties
The thermal performance parameters of the SAE J404 87L42 steel are as follows:
| Temperature (°C) | 13 | 174 | 984 |
| Modulus of elasticity (GPa) | - | 575 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 43.3 | 12.2 |
| Specific thermal capacity (J/kg·°C) | - | 212 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.14 | - | - |
| Deity (kg/dm³) | - | - | 333 |
| Poisson’s coefficient, ν | - | - | 334 |
SAE J404 87L42 Material Machining Technology
SAE J404 87L42 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 87L42 steel presents a number of challenges due to its combination of high hardness, strength and ductility.