GTD 222(Ni-Cr-Co-W-Ta-Nb)

1. Introduce

– Cast nickel-based alloy used in onshore gas turbine engines

– Introduced to replace the cobalt-based alloy FSX-414 as the second and third stage nozzle material in gas turbines

– Developed to replace GTD 111

– Maintains excellent mechanical properties up to 760°C through precipitation hardening and solid solution strengthening

* GTD 222 vs FSX-414 tensile strength, creep-rupture properties

– FSX-414 gas turbine nozzle: frequent maintenance required due to creep deflection caused by high combustion temperature

– GTD 222 : Material with improved creep resistance and better weldability, oxidation and thermal corrosion resistance than FSX-414 (Approx. 93℃ improvement in creep resistance, 200% improvement in creep strength)
→ Limitations (creep deflection characteristics) of FSX-414 gas turbine nozzles can be minimized or eliminated

– Tensile strength : GTD 222 is superior to FSX-414

Comparison of properties of GTD-222 and FSX-414 at 760℃ (tensile strength)

* GTD 222 vs GTD 111

→ GTD 222 has less Al and Ti for better machinability and weldability

2. Property

– High temperature corrosion resistance, thermal stability, creep properties, tensile strength, machinability, and weldability

[GTD 222 Chemical Composition (%)]

[GTD 222 Mechanical Properties]

3. Standard & Specification

4. Available Form

– Bar, Rod

– Plate, Sheet

– Wire, Coil

– Pipe

5. Application & Product

– Aerospace

(1) Turbine blades / (2) Turbine engines / (3) Nozzles / (4) Vanes