SAE J404 41L21 Introduce
SAE J404 41L21 is an American steel grade that is used in a range of applications. It is a low-alloy steel, with alloying elements that give it a range of desirable properties. These include good mechanical properties, corrosion resistance, and heat treatability. This makes it an ideal choice for a wide variety of manufacturing applications, from automotive components to structural components and heavy machinery.
Smelting temperature:1162°C - 1934°C
Application:Chemical compositions of SAE alloy steels
SAE J404 41L21 Material Mechanical Properties
The alloying elements present in SAE J404 41L21 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 41L21 steel are as follows:
| YieldRp0.2 | ≤ 982 (MPa) |
| TeileRm | ≤ 527 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 21% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 221 |
SAE J404 41L21 Material Thermal Properties
The thermal performance parameters of the SAE J404 41L21 steel are as follows:
| Temperature (°C) | 41 | 792 | 351 |
| Modulus of elasticity (GPa) | - | 234 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 33.2 |
| Specific thermal capacity (J/kg·°C) | - | 441 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 212 |
| Poisson’s coefficient, ν | - | - | 312 |
SAE J404 41L21 Material Machining Technology
SAE J404 41L21 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 41L21 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.