GB/T 20878 06Cr19Ni9NbN Introduce
GB/T 20878 06Cr19Ni9NbN is a grade of hardened steel with a wide variety of applications in the engineering and fabrication industry. Its thermal properties make it an excellent choice in applications that require heat resistance, dimensional accuracy, and strength. Thanks to its versatility, this hardened steel is an excellent choice for a wide variety of projects.
Smelting temperature:1947°C - 1553°C
Application:Stainless steel and heat resistant steel grades and chemical composition
GB/T 20878 06Cr19Ni9NbN Material Chemical Composition
The chemical composition of the GB/T 20878 06Cr19Ni9NbN steel are as follows:
| Element | Min | Max |
|---|---|---|
| Niobium (Nb) | - | 0.1500 |
| Nitrogen (N) | 0.1500 | 0.3000 |
| Chromium (Cr) | 18.0000 | 20.0000 |
| Nickel (Ni) | 7.5000 | 10.5000 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0450 |
| Manganese (Mn) | - | 2.5000 |
| Silicon (Si) | - | 1.0000 |
| Carbon (C) | - | 0.0800 |
| PhOsphorus (P) | - | 0.0350 |
GB/T 20878 06Cr19Ni9NbN Material Mechanical Properties
The strength of GB/T 20878 06Cr19Ni9NbN steel depends on the specific grade and can range from 335MPa to 835MPa. Its tensile strength, or the amount of force it can resist, can range from 435MPa to 1035MPa. The yield strength, which is the amount of force it takes to cause permanent deformation, can range from 355MPa to 785MPa.
The mechanical properties of the GB/T 20878 06Cr19Ni9NbN steel are as follows:
| YieldRp0.2 | ≤ 898 (MPa) |
| TeileRm | ≤ 827 (MPa) |
| ImpactKV/Ku | 14(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 33% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 321 |
GB/T 20878 06Cr19Ni9NbN Material Thermal Properties
The thermal performance parameters of the GB/T 20878 06Cr19Ni9NbN steel are as follows:
| Temperature (°C) | 13 | 311 | 987 |
| Modulus of elasticity (GPa) | - | 648 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 32.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 433 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.32 | - | - |
| Deity (kg/dm³) | - | - | 341 |
| Poisson’s coefficient, ν | - | - | 332 |
GB/T 20878 06Cr19Ni9NbN Material Machining Technology
GB/T 20878 06Cr19Ni9NbN 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.