Alloy 725
N07725
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Material description
Alloy 725 is a corrosion-resistant, high-strength nickel-chromium-molybdenum-niobium alloy with a low carbon content.
The material has excellent resistance to a wide range of corrosive media and high mechanical properties, which are achieved thanks to ageing. In addition, UNS N07725 is exceptionally resistant to corrosion such as pitting, crevice and stress corrosion cracking.
The material has also proven itself in alkaline solutions and a variety of organic and mineral acids.
This is supported by high heat resistance, making the grade a true all-rounder in the oil and gas industry.
AN OVERVIEW OF THE PROPERTIES OF Alloy 725:
- Good mechanical properties
- Good resistance in mineral and organic acids and alkaline solutions
- Excellent resistance to pitting, crevice and stress corrosion cracking
- High heat resistance
Applications
- Fasteners, especially in marine applications
- Offshore technology
- Shipbuilding
- Production of mineral acids
- Petroleum and natural gas chemistry
- Flue gas cleaning systems
Chemical composition in %
| ASTM B637 | B805 | ||
|---|---|---|
| C, max. | 0,03 | |
| Mn, max. | 0,35 | |
| Si, max. | 0,2 | |
| P, max. | 0,015 | |
| S, max. | 0,010 | |
| Cr | 19,00 – 22,50 | |
| Mo | 7,00 – 9,50 | |
| Cb (Nb) + Ta | 2,75 – 4,00 | |
| Ti | 1,00 – 1,70 | |
| Al, max. | 0,35 | |
| Fe | Rest | |
| Ni | 55,0 – 59,0 |
Mechanical properties
| Solution annealed + precipitation hardened | Bar | forging ASTM B637 | Bar | forging ASTM B805 “D ≤ 254 mm” |
|---|---|---|
| Rm (MPa) | ≥ 1034 | ≥ 1137 |
| Rp 0,2 (MPa) | ≥ 827 | ≥ 827 |
| A (%) | ≥ 20 | ≥ 20 |
| Z (%) | ≥ 35 | ≥ 35 |
| Hardness | max. 43 HRC |
The specified values are non-binding guide values.