Material EN 1.4571 (stainless steel X6CrNiMoTi17-12-2)
DIN EN 1.4571 (X6CrNiMoTi17-12-2) material is made by adding titanium (Ti) to EN 1.4401 (X5CrNiMo17-12-2) stainless steel to improve resistance to intergranular corrosion. Titanium can improve the corrosion resistance of stainless steel, especially intergranular corrosion, effectively prevent the sensitization of stainless steel, and also improve the stability of steel at high temperature and high pressure. When the mass fraction of titanium is between 0.03% and 0.1%, the yield strength of the steel is improved. Therefore, EN 1.4571 material has higher temperature resistance, corrosion resistance and sensitization resistance than 1.4401.
Corrosion resistance
EN 1.4571 is more resistant to corrosion than EN 1.4301 (X5CrNi18-10) and 1.4401 (X5CrNiMo17-12-2). As it contains titanium and forms TiC with carbon, it greatly reduces the risk of sensitization to intergranular corrosion. However, at high temperature, high concentration of concentrated nitric acid, chloride and hot alkaline solution, significant corrosion may occur.
Welding
EN 1.4571 steel has good weldability, does not require preheating before welding and generally does not require heat treatment after welding.
Heat treatment
- Hot forming temperature: 1200-900°C (cooling: air)
- Solution annealing temperature: 1020-1120°C (cooling: air, water)
data sheet
Below is the data sheet of 1.4571 material, including chemical composition, density, coefficient of thermal expansion, thermal conductivity, yield strength, hardness, etc.
Chemical composition
The typical chemical composition of 1.4571 is presented in the table below.
| Chemical composition % | |||||||||||
| Country (regions) | Standard | Steel Name (Material Number) | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | No | Mo | You |
| European Union | EN 10088-3 | X6CrNiMoTi17-12-2 (1.4571) | 0.08 | 1.00 | 2:00 | 0.045 | 0.015 | 16.5-18.5 | 10.5-13.0 | 2:00-2:50 | 5xC-0.70 |
Physical properties
- Density: 8.0 g/cm3
- Electrical resistance: 0.75 (Ω.mm2/m) at 20 °C
- Specific heat capacity: 500 (J/kg.K) at 20 °C
- Thermal conductivity: 15 (W/mK) at 20 °C
- Modulus of elasticity (GPa):
- 200 (at 20°C)
- 194 (at 100°C)
- 186 (at 200°C)
- 179 (at 300°C)
- 172 (at 400°C)
- 165 (at 500°C)
- Thermal expansion (10 -6 .K -1 ):
- 16.5 (20 – 100°C)
- 17.5 (20 – 200°C)
- 18.0 (20 – 300°C)
- 18.5 (20 – 400°C)
- 19.0 (20 – 500°C)
Notes: 10 -6 .K -1 = 10 -6 /K = (µm/m)/°C
Mechanical properties
| Mechanical properties (solution annealed) | |||||||||
| Country (regions) | Standard | Steel grade (steel number) | Diameter (d) or Thickness | ||||||
