2.4668/Alloy 718
VALBRUNA GRADE
AV718HTV
STEEL TYPE
Corrosion Resistant Alloys
Profile shapes
- Round EN 10060 / EN 10278
- Flat EN 10058 / EN 10278
- Square EN 10059 / EN 10278
- Hexagonal EN 10278
- Angle EN 10056
- Bar steel, bright steel, wire, wire rod, billets, ingots, semi-finished products
Description of material
AV718HTV is an age hardening Nickel – Chromium – Iron – Molybdenum alloy with the additions of Niobium, Titanium and Aluminum that provide its strengthening by an aging heat treatment enable to generate a precipitation hardening of secondary phases such as ΥI and ΥII. AV718CRV and AV718HTV have basically same chemical composition and differ only by their heat treatments and are produced by special steel making remelting such as VIM-VAR-ESR.
Applications
The structure and composition of AV718HTV offers high strength together with corrosion resistance properties in both oxidizing and reducing environments. These characteristics provide a good resistance to differing kinds of corrosion, such as pitting, crevice and stress corrosion cracking as well. AV718HTV is widely used in sour gas application due to its resistance to SSC caused by Hydrogen Sulphide, in petrochemical industries, in crude oil and natural gas components and in drilling equipment for oil and gas production. It is suitable for the fabrication of many products such as flanges, valves, bolting, pump shafts, turbine blades, fittings and parts working in corrosive environments typical of chemical processing. Moreover, AV718HTV is widely used in aeronautics and aerospace components and devices working in high or cryogenic temperature and in several application where a good creep and fatigue resistance are important and indispensable requirements.
Designations
| Commercial name | Alloy 718 |
| International Designation | NiCr19Fe19Nb5Mo3 / NiCr19NbMo |
| W.N. | 2.4668 |
| UNS | N07718 |
Chemical composition
| Chemical element | C | Mn | Si | S | P | Ni | Cr | Fe | Al | Cu | Ti | Co | Ta+Nb | Andere |
| Minimum value % | - | - | - | - | - | 50% | 17% | 15% | 2,8% | - | 0,65% | - | 4,75% | B max 0,006% Pb max 0,001% Se max 0,0005% Bi max 0,0005% |
| Maximum value % | 0,08% | 0,35% | 0,35% | 0,015% | 0,015% | 55% | 21% | 21% | 3,3% | 0,3% | 1,15% | 1% | 5,5% | B max 0,006% Pb max 0,001% Se max 0,0005% Bi max 0,0005% |
Mechanische Eigenschaften
| Zustand | Untertyp | Rm [N/mm²] | Rm [Ksi] | Rp0,2% [N/mm²] | Rp0,2% [Ksi] | E4d [%] | HBW |
| Lösungsgeglüht und gealtert | A + PH | 1276 min | 185 min | 1034 min | 150 min | 12 min | 330 min |