GB/T 20878 80Cr20Si2Ni Introduce
GB/T 20878 80Cr20Si2Ni steel has excellent corrosion resistance in many different environments. It exhibits excellent resistance to corrosion in atmospheric conditions, dilute mineral acids, and most alkaline solutions. The alloy also has an excellent ability to resist galvanic corrosion when used in combination with other materials.
Smelting temperature:1487°C - 1683°C
Application:Stainless steel and heat resistant steel grades and chemical composition
GB/T 20878 80Cr20Si2Ni Material Mechanical Properties
GB/T 20878 80Cr20Si2Ni steel has superior mechanical properties compared to ordinary steel. It has an excellent strength-to-weight ratio and good levels of stiffness, ductility, and machinability. Its mechanical properties are largely dependent on the grade, with higher grades having higher strength and lower ductility.
The mechanical properties of the GB/T 20878 80Cr20Si2Ni steel are as follows:
| YieldRp0.2 | ≤ 856 (MPa) |
| TeileRm | ≤ 237 (MPa) |
| ImpactKV/Ku | 14(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) | 413 |
GB/T 20878 80Cr20Si2Ni Material Thermal Properties
The thermal performance parameters of the GB/T 20878 80Cr20Si2Ni steel are as follows:
| Temperature (°C) | 14 | 414 | 485 |
| Modulus of elasticity (GPa) | - | 814 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 31.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 341 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.43 | - | - |
| Deity (kg/dm³) | - | - | 321 |
| Poisson’s coefficient, ν | - | - | 141 |
GB/T 20878 80Cr20Si2Ni Material Machining Technology
The machining of GB/T 20878 80Cr20Si2Ni steel requires specific cutting tools. A wide range of cutting tools such as drills, taps, reamers, and end mills can be used with this material. Drills are usually used to create the initial hole and are then followed by the tap. Reamers are often used to deburr and the finish off the hole. End mills are used to create more complicated shapes and profiles in the material.