Corrosion Resistant Alloys
NAS 625 (UNS N06625), comparable to Inconel® 625 Alloy
A primarily nickel alloy with molybdenum and niobium added to the nickel-chromium base for solute strengthening, NAS 625, comparable to Inconel® 625 Alloy, provides powerful resistance against corrosion and heat. Uses include parts in chemical and garbage incinerator plants. Nippon Yakin supplies this product in plate, sheet and strip forms.
Coil
Sheet
Plate
Chemical Composition
UNS N06625
| C | Si | Mn | P | S | Ni | Cr | Mo | Al | TI | Fe | Co | Nb | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | ― | ― | ― | ― | ― | 58.0 | 20.0 | 8.0 | ― | ― | ― | ― | 3.15 |
| Max | 0.01 | 0.50 | 0.50 | 0.015 | 0.015 | ― | 23.0 | 10.0 | 4.0 | 4.0 | 5.0 | 1.0 | 4.15 |
NCF625
| C | Si | Mn | P | S | Ni | Cr | Mo | Al | TI | Fe | Co | Nb | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | ― | ― | ― | ― | ― | 58.0 | 20.0 | 8.0 | ― | ― | ― | ― | 3.15 |
| Max | 0.01 | 0.50 | 0.50 | 0.015 | 0.015 | ― | 23.0 | 10.0 | 4.0 | 4.0 | 5.0 | 1.0 | 4.15 |
Physical Properties
| Specific heat (J/kg･K) | 410 | |
| Specific resistivity (μΩ･cm) | 1.29 | |
| Thermal conductivity (W/m･K) | 9.8 | |
| Coefficient of thermal expansion (10-6/℃) | 20–100℃ | 12.8 |
| Young's modulus (MPa) | 20.4 x 104 | |
| Modulus of rigidity (MPa) | 78.8 x 104 | |
| Ferromagnetism | None | |
| Melting point (℃) | 1290-1350 | |
Mechanical Properties
Mechanical Properties at Room Temperature
ASTM B443 Grade 1 / UNS N06625 (annealed)
| 0.2% proof stress (N/mm2) |
Tensile strength (N/mm2) |
Elongation (%) |
Hardness (HRB) |
|
|---|---|---|---|---|
| Cold-rolled sheet, strip |
≥ 414 | ≥ 827 | ≥ 30 | ― |
| Hot-rolled sheet, ≤ 70mm |
≥ 379 | ≥ 758 | ≥ 30 | ― |
| Cold-rolled sheet, ≤ 9.5mm |
≥ 379 | ≥ 758 | ≥ 30 | ― |
ASTM B443 Grade 2 / UNS N06625 (solution treated)
| 0.2% proof stress (N/mm2) |
Tensile strength (N/mm2) |
Elongation (%) |
Hardness (HRB) |
|---|---|---|---|
| ≥ 276 | ≥ 690 | ≥ 30 | ― |
JIS G4902 / NCF625
| 0.2% proof stress (N/mm2) |
Tensile strength (N/mm2) |
Elongation (%) |
Hardness (HRB) |
|
|---|---|---|---|---|
| > 0.5mm, ≤ 3.0mm | ≥ 415 | ≥ 830 | ≥ 30 | ― |
| > 3.0mm, ≤ 70mm | ≥ 380 | ≥ 760 | ≥ 30 | ― |
JIS G4902 / NCF625
| 0.2% proof stress (N/mm2) |
Tensile strength (N/mm2) |
Elongation (%) |
Hardness (HRB) |
|---|---|---|---|
| ≥ 275 | ≥ 690 | ≥ 30 | ― |
Examples
| 0.2% proof stress (N/mm2) |
Tensile strength (N/mm2) |
Elongation (%) |
Hardness (HRB) |
|
|---|---|---|---|---|
| Hot-rolled material, 11-mm thick |
407 | 826 | 62 | HB 201 |
| Cold-rolled material, 2.5-mm thick |
392 | 832 | 57 | HV 197 |
All were solution treated
Strength at Room Temperature
Corrosion Resistance
Test conditions: immersed for 24 hr in a solution of 7% H2SO4 + 3% HCl + 1% FeCl3 + 1% CuCl2
Cracking formed by multicrevices
Weldability
Although NAS 625 is not well suited to oxyacetylene welding, other welding techniques can be used. NAS 625 has a weldability similar to SUS 304. The welding solidification cracking sensitivity lies between SUS 304 and SUS 310.
Applications
Chemical plants, atomic power, seawater applications, jet engine parts, aircraft material, heat treatment furnace material, evaporators.
* Inconel is a registered trademark of Special Metals Corporation.
