GB/T 20878 24Cr18Ni8W2 Introduce
GB/T 20878 24Cr18Ni8W2 Stainless Steel is a type of austenitic chromium-nickel stainless steel widely used for various industrial and mechanical systems. It is composed mainly of iron, chromium, nickel and molybdenum. Its unique combination of properties provides a number of advantages, including corrosion and abrasion resistance, superior strength and ductility, and excellent thermal conductivity. These properties make it suitable for many industrial and mechanical applications, such as automobile exhaust systems, medical equipment, power plants, and domestic appliances such as refrigerators and washing machines.
Smelting temperature:1386°C - 1494°C
Application:Stainless steel and heat resistant steel grades and chemical composition
GB/T 20878 24Cr18Ni8W2 Material Mechanical Properties
The mechanical properties of GB/T 20878 24Cr18Ni8W2 steel depend largely on its chemical composition. Generally, the higher the carbon content and low alloy levels means higher toughness and strength.GB/T 20878 24Cr18Ni8W2 grades ranging from 0.3 to 2.5 percent carbon are considered to have excellent mechanical properties. Higher levels of carbon increase strength, but also reduce ductility and toughness.
The mechanical properties of the GB/T 20878 24Cr18Ni8W2 steel are as follows:
| YieldRp0.2 | ≤ 935 (MPa) |
| TeileRm | ≤ 665 (MPa) |
| ImpactKV/Ku | 22(J) |
| ElongationA | 31% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 434 |
GB/T 20878 24Cr18Ni8W2 Material Thermal Properties
The thermal performance parameters of the GB/T 20878 24Cr18Ni8W2 steel are as follows:
| Temperature (°C) | 43 | 879 | 663 |
| Modulus of elasticity (GPa) | - | 949 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 42.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 144 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 212 |
| Poisson’s coefficient, ν | - | - | 134 |
GB/T 20878 24Cr18Ni8W2 Material Machining Technology
GB/T 20878 24Cr18Ni8W2 steel is an excellent material for machining and fabrication. Its high carbon content and strength make it an ideal choice for a range of applications. The selection of the proper cutting tools, cutting speeds, and feed rates are important for successful machining. HSS and HSC tools with a cutting speed of up to 350 m/min and a feed rate of 0.2 to 0.5 mm per revolution are generally recommended. Care should also be taken to ensure that the cutting tools are sharp in order to reduce cutting forces and increase cutting accuracy.