SAE J404 AISI 4142 Introduce
The SAE J404 steel standard covers a wide range of steel grades with different chemical compositions, physical properties, and forming processes. The standard has been designed to allow these steel grades to be used in a variety of automotive applications, including components requiring strength, corrosion resistance, or heat resistance.
Smelting temperature:1388°C - 1341°C
Application:Chemical compositions of SAE alloy steels
SAE J404 AISI 4142 Material Chemical Composition
The chemical composition of the SAE J404 AISI 4142 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | 0.3800 | 0.4600 |
| Manganese (Mn) | 0.7500 | 1.0000 |
| PhOsphorus (P) | - | 0.0300 |
| Sulfur (S) | - | 0.0400 |
| Silicon (Si) | 0.1500 | 0.3500 |
| Chromium (Cr) | 0.8000 | 1.1000 |
| Molybdenum (Mo) | 0.1500 | 0.2500 |
| Carbon (C) | 0.4000 | 0.4500 |
| PhOsphorus (P) | - | 0.0300 |
| Sulfur (S) | - | 0.0400 |
| Nickel (Ni) | 0.1500 | 0.2500 |
| Molybdenum (Mo) | - | 0.0600 |
| Copper (Cu) | - | 0.3500 |
| Lead (Pb) | 0.1500 | 0.3500 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.2500 |
| Silicon (Si) | 0.1500 | 0.3500 |
| Chromium (Cr) | 0.8000 | 1.1000 |
| Copper (Cu) | - | 0.3500 |
| Nickel (Ni) | - | 0.2500 |
SAE J404 AISI 4142 Material Mechanical Properties
The alloying elements present in SAE J404 AISI 4142 steel endow it with a range of mechanical properties. It is a relatively low-carbon steel, meaning that it is fairly soft and ductile and can be easily machined and welded. This makes it a popular choice for a wide range of applications. The steel has an ultimate tensile strength of around 400 MPa, a yield strength of 250 MPa, and an elongation of 16-22%.
The mechanical properties of the SAE J404 AISI 4142 steel are as follows:
| YieldRp0.2 | ≤ 824 (MPa) |
| TeileRm | ≤ 924 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 424 |
SAE J404 AISI 4142 Material Thermal Properties
The thermal performance parameters of the SAE J404 AISI 4142 steel are as follows:
| Temperature (°C) | 42 | 436 | 591 |
| Modulus of elasticity (GPa) | - | 958 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 343 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 211 |
| Poisson’s coefficient, ν | - | - | 144 |
SAE J404 AISI 4142 Material Machining Technology
SAE J404 AISI 4142 steel is a medium carbon steel that contains up to 0.55% carbon, 0.30% manganese and 0.80% silicon. It is known for its high hardenability, being able to attain very high Rockwell hardness ratings of up to 62 HRC – making it a particularly hard and difficult material to machine. Furthermore, although SAE J404 AISI 4142 steel is a hard material, it is also a highly ductile one with excellent formability. As a result, it is a popular choice of material across several industries, including automotive, aerospace, and medical.