High temperature Inconel 718 plus hardened nickel-base alloy for
Copper-extruded mold
Inconel 718 Plus (UNSN 07818) is a new hardened nickel-base alloy, this
alloy is designed to have excellent comprehensive mechanical properties, good heat processing
and welding properties, and appropriate cost below 700°C . The launch of the 718plus alloy
effectively fills the long-standing gap between the two most widely
used High-temperature alloys Inconel 718 (650 °C) and Waspaloy (750 °C).
The Inconel 718 Plus was based on Inconel 718 to reduce the iron content by 18% to 10%, adding 9% cobalt and 1%
tungsten, adjusting Al + Ti and Al/Ti, and appropriately increasing
the niobium content, 718 Plus alloy overcomes the Insufficient requirements of the two
alloy 718 and Waspaloy (GH4738),so that could be used and 700°C
718,718Plus,Waspaloy Chemical Composition comparison
| element | C | Ni | Cr | Mo | W | Co | Fe | Nb | Ti | Al | P | B |
| 718 | 0.025 | Remain | 18.10 | 2.80 | - | - | 18.00 | 5.40 | 1.00 | 0.45 | 0.007 | 0.004 |
| 718 Plus | 0.020 | Remain | 18.00 | 2.75 | 1.00 | 9.00 | 10.00 | 5.45 | 0.70 | 1.45 | 0.010 | 0.004 |
| Waspaloy | 0.035 | Remain | 19.40 | 4.25 | - | 13.25 | - | - | 3.00 | 1.30 | 0.006 | 0.006 |
Application
These products have been typically used for parts requiring high
resistance to creep and stress rupture up to 1400°F(760°C) and
oxidation resistance up to 1800°F(982°C), but usage is not limited
to such applications.
At present, the alloy The 718 Plus has been promoted and applied in
several well-known aviation-engine companies, for plates, gates,
fasteners, blades and so on.
The 718 Plus is also a commonly used material for copper extrusion mold.
Available forms
718Plus alloy is available in all product forms: ingot, billet,
block, forged round bar, hot-rolled shapes and rectangles, bar,
rod, wire, plate, sheet, strip, and castings.
