Alloy 625 / UNS N06625 / 2.4856
Alloy 625 / UNS N06625 / 2.4856– High-Strength Corrosion-Resistant Nickel Alloy
Properties of Alloy 625 / UNS N06625 / 2.4856
Alloy 625 / UNS N06625 / 2.4856 is a low-carbon nickel-chromium-molybdenum-niobium alloy known for excellent fatigue strength and resistance to stress corrosion cracking when exposed to chloride containing media. Good weldability.
Key Features:
- Excellent resistance to pitting, crevice corrosion, and intergranular attack
- High strength and toughness across a wide temperature range
- Good resistance to mineral acids (nitric, phosphoric, sulfuric, hydrochloric)
- Resistance to alkalis and organic acids
- Good weldability and formability
Applications of Alloy 625 / UNS N06625 / 2.4856
Alloy 625 / UNS N06625 / 2.4856 typical applications include:
- Chemical processing: reactors, heat exchangers, piping
- Offshore and marine engineering
- Environmental technology: flue gas scrubbers, waste incineration
- Aerospace and power generation
Specification Overview
| Material number | 2.4856 |
| Alloy | 625 |
| EN designation | NiCr22Mo9Nb |
| UNS | N06625 |
| Böhler designation | L625 |
| Semi-finished products (strip, sheet, pipe, rod) | DIN 17744 / DIN 17752 / DIN EN 10228 |
| Forged or rolled components | ASTM B 446 / ASME SB 446 / ASTM B564 / DIN 17752/ VdTÜV 499 / AMS 5666 |
| Sheets / strips | ASTM B 443 / ASME SB 443 / DIN 17750 / VdTÜV 499 / AMS 5599 |
| Wire | DIN 17753 / DIN EN 10088-3 |
| Pipe / Tube | ASTM B 444 / ASME SB 444 / ASTM B 704 / ASME SB 704/ ASTM B 705 / ASME SB 705 / VdTÜV 499 |
Physical Properties:
| Material Density | 8.44 g/cm³ |
| Melting Point | 1290 – 1350°C |
| Thermal Conductivity (20 °C) | 9.8 W/(m·K) |
| Electrical Resistivity | 1.25 Ω·mm²/m |
| Thermal Expansion (20–100 °C) | 12.5 × 10⁻⁶/K |
Mechanical Properties: (Solution Annealed)
| Tensile Strength Rm | ≥ 760 MPa |
| Yield Strength Rp0.2 | ≥ 380 MPa |
| Elongation A5 | ≥ 35% |
Typical Chemical Composition (weight %):
Element Content acc. to VdTÜV Werkstoffblatt 499
| C | Si | Mn | P | S | Co | Cr | Fe | Mo |
| ≤ 0.030 | ≤ 0.40 | ≤0.50 | ≤ 0.010 | ≤ 0.010 | ≤ 1.0 | 21.0 – 23.0 | ≤ 5.0 | 8.0 – 10.0 |
| Ni | Ti | Al | Nb + Al | |||||
| Balance | ≤ 0.40 | ≤ 0.40 | 3.2 – 3.8 |
Product Portfolio:
Our company offers Alloy 625 / UNS N06625 / 2.4856 in a wide range of forms and processing stages:
Sheets and Plates – hot/cold rolled, solution annealed
Bars and Rods – forged or rolled, pickled
Tubes and Pipes – seamless or welded
Wire – drawn or rolled
Fittings and Flanges
Forged and Machined Components – per drawing or specification
Other dimensions on request. Factory quantities also possible. All information without guarantee and for informational purposes only.