GB/T 20878 18Cr12MoVNbN Introduce
GB/T 20878 18Cr12MoVNbN 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:1921°C - 1256°C
Application:Stainless steel and heat resistant steel grades and chemical composition
GB/T 20878 18Cr12MoVNbN Material Chemical Composition
The chemical composition of the GB/T 20878 18Cr12MoVNbN steel are as follows:
| Element | Min | Max |
|---|---|---|
| Vanadium (V) | 0.1000 | 0.4000 |
| Silicon (Si) | - | 0.5000 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.6000 |
| Niobium (Nb) | 0.2000 | 0.6000 |
| Nitrogen (N) | 0.0500 | 0.1000 |
| Molybdenum (Mo) | 0.3000 | 0.9000 |
| Manganese (Mn) | 0.5000 | 1.0000 |
| Chromium (Cr) | 10.0000 | 13.0000 |
| Carbon (C) | 0.1500 | 0.2000 |
GB/T 20878 18Cr12MoVNbN Material Mechanical Properties
The mechanical properties of GB/T 20878 18Cr12MoVNbN 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 18Cr12MoVNbN 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 18Cr12MoVNbN steel are as follows:
| YieldRp0.2 | ≤ 762 (MPa) |
| TeileRm | ≤ 184 (MPa) |
| ImpactKV/Ku | 42(J) |
| ElongationA | 21% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 224 |
GB/T 20878 18Cr12MoVNbN Material Thermal Properties
The thermal performance parameters of the GB/T 20878 18Cr12MoVNbN steel are as follows:
| Temperature (°C) | 23 | 618 | 575 |
| Modulus of elasticity (GPa) | - | 276 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 23.2 |
| Specific thermal capacity (J/kg·°C) | - | 211 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 242 |
| Poisson’s coefficient, ν | - | - | 412 |
GB/T 20878 18Cr12MoVNbN Material Machining Technology
The machining of GB/T 20878 18Cr12MoVNbN steel is an important process in the manufacturing of various mechanical components and industrial products. GB/T 20878 18Cr12MoVNbN steel is a high-quality alloy steel with a high carbon content, which makes it an excellent choice for machining and fabrication. Its high carbon content also makes it an excellent choice for parts that require strength and durability.