JIS G3127 SL9N520 Introduce
The steels within the JIS G3127 standard resemble the Japanese Industrial Standards Nr15 and Nr17, as well as other JIS steel grades, but exhibit higher mechanical properties due to their alloyed composition. As a low alloyed steel, the steel composition of JIS G3127 SL9N520 is characterized by its reactivity and machinability. The steel strength is also suitable for many applications that require high strength such as truck frames and bridge construction.
Smelting temperature:1762°C - 1655°C
Application:Nickel steel plate for low temperature pressure vessel
JIS G3127 SL9N520 Material Chemical Composition
The chemical composition of the JIS G3127 SL9N520 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 0.0300 |
| Sulfur (S) | - | 0.0250 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | 8.5000 | 9.5000 |
| Manganese (Mn) | - | 0.9000 |
| Carbon (C) | - | 0.1200 |
JIS G3127 SL9N520 Material Mechanical Properties
Impact resistance is a measure of a material's ability to absorb the shock of impact. JIS G3127 SL9N520 steel generally has an impact resistance of around 30 to 50 J/cm2. This is lower than the impact resistance of mild steel, which is usually around 60 J/cm2. This lower impact resistance makes JIS G3127 SL9N520 steel less suitable for applications that require protection against impacts and shocks.
The mechanical properties of the JIS G3127 SL9N520 steel are as follows:
| YieldRp0.2 | ≤ 776 (MPa) |
| TeileRm | ≤ 194 (MPa) |
| ImpactKV/Ku | 13(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 34% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 421 |
JIS G3127 SL9N520 Material Thermal Properties
The thermal performance parameters of the JIS G3127 SL9N520 steel are as follows:
| Temperature (°C) | 12 | 685 | 198 |
| Modulus of elasticity (GPa) | - | 612 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 11 |
| Thermal conductivity (W/m·°C) | - | 11.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 222 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.43 | - | - |
| Deity (kg/dm³) | - | - | 342 |
| Poisson’s coefficient, ν | - | - | 444 |
JIS G3127 SL9N520 Material Machining Technology
JIS G3127 SL9N520 steel has a good combination of strength and toughness, which makes it suitable for many different types of applications. This steel is most often used for automotive components, such as cams, pistons, axles, and engine valves. It is also used for pipeline components and storage vessels and can be used for military equipment and general machining applications, as well. The steel has a carbon content range of 0.15-0.25%, molybdenum content of 0.3-0.5%, and an alloy content range of 0.3-1.3%. It is an austenitic steel, meaning it is non-magnetic, has a moderate strength-to-weight ratio, and has good resistance to corrosion and wear. The steel is considered a high-alloy steel, due to its high alloy content, making it an excellent choice for applications that require corrosion resistance and strength.