What is the material grade 925?
UNS N09925
General Range
Alloy 925 is a nickel-based alloy with additions of primarily iron and chromium, with additions of molybdenum, copper, titanium and aluminum. Its high strength and corrosion resistance make it suitable for applications such as valves, hangers, packers and tubing in sour gas environments. It is also used in fasteners and pump shafts in marine environments.
The combination of nickel and chromium provides protection in both oxidizing and reducing atmospheres. The high nickel content also gives it excellent resistance to chloride stress corrosion cracking. Its resistance to pitting and crevice corrosion is also excellent. The alloy is produced by the vacuum remelt process, but can also be supplied by the air-melted single consumable electrode (VAR or ESR) process if material specifications allow.
Alloy 925 meets the requirements of API 6ACRA and is approved for use in a variety of conditions and with varying hardness limits in accordance with NACE MR0175. Gnee Steel has extensive experience with heat treating this alloy.
CHEMICAL COMPOSITION
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu | NbCbTa | Ti | Al | Fe |
|---|
| Min | . | . | . | . | . | 19.50 | 42.00 | 2.50 | 1.50 | • | 1.90 | 0.10 | 22.00 |
| Max | 0.03 | 0.50 | 1.00 | 0.030 | 0.030 | 22.50 | 46.00 | 3.50 | 3.00 | 0.50 | 2.40 | 0.50 | 0.0 |
