20Cr25Ni20 is a stainless steel alloy that belongs to the category of austenitic stainless steel. This material is characterized by high chromium (Cr) and nickel (Ni) contents, which give it excellent corrosion resistance and good mechanical properties at high temperatures.
20Cr25Ni20 Data Sheet
Equivalent Standards and Designations
- UNS (Unified Numbering System): S31040
- EN (European Standard): 1.4845
- DIN (German Institute for Standardization): X12CrNi25-20
- AISI (American Iron and Steel Institute): Commonly referred to in a similar context to 310 stainless steel (though not identical)
Chemical Composition (%)
| C | Si | Mn | S | P | Cr | Ni |
|---|---|---|---|---|---|---|
| ≤0.08 | ≤1.00 | ≤2.00 | ≤0.030 | ≤0.035 | 24.00 ~ 26.00 | 19.00 ~ 22.00 |
Heat Treatment Specification & Metallographic Structure
Heat treatment specification: Solution 1030 ~ 1180℃ fast cooling.
Metallographic structure: The structure is characterized by Austenitic type.
Physical Property
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ (7900 kg/m³) |
| Melting Point Range | 1400-1450°C (2552-2642°F) |
| Thermal Conductivity | 14 W/m·K at 20°C |
| 21 W/m·K at 500°C | |
| Specific Heat Capacity | 500 J/kg·K at 20°C |
| Thermal Expansion Coefficient | 15 x 10⁻⁶ /K from 20°C to 100°C |
| 17 x 10⁻⁶ /K from 20°C to 500°C | |
| Electrical Resistivity | 0.85 µΩ·m at 20°C |
| Tensile Strength | 550-700 MPa |
| Yield Strength (0.2% offset) | 240-300 MPa |
| Elongation at Break | 35-45% |
| Hardness | 150-200 HV (Vickers hardness) |
| Magnetic Permeability | Non-magnetic in the annealed state |
| Modulus of Elasticity | ~200 GPa |
| Poisson’s Ratio | ~0.30 |
Features & Scope of Use
- Heat Exchangers: Used in industries where materials are exposed to high temperatures and corrosive substances.
- Furnace Components: Ideal for parts that must withstand high temperatures and resist oxidation.
- Chemical Processing Equipment: Suitable for components exposed to corrosive chemicals and high temperatures.
- Gas Turbines: Employed in high-temperature sections due to their thermal stability.
20Cr25Ni20 and 310 Stainless Steel
20Cr25Ni20 is similar to 310 stainless steel, but not identical. Both alloys are austenitic stainless steels with high chromium and nickel contents, designed for high-temperature applications and excellent corrosion resistance. However, there are some differences in their specific composition and properties.
