Aeroval GL3

Material Description

GL3 is a solid solution nickel-base alloy.  This alloy shows high mechanical properties at temperatures up to 450° and above 600°C, good corrosion resistance in different environments (mineral and organic acids), to crevice corrosion, pitting, erosion, intergranular attack, stress corrosion cracking resistance.

This performances are achieved by the combination of Nickel, Chromium, Molybdenum and Columbium. This grade can be subjected to two different heat treatments to achieve appropriate mechanical properties for different applications: annealing (grade 1) and solution annealing (grade 2).

Applications

Aerospace component (aircraft-engine and airframe components, gas turbine engine ducting, combustion liners, ...), chemical-processing equipment handling mixed acids both oxidising and reducing, power generation equipment (superheater-tube shield, soot-blower tubes, boiler-tube separator and hangers), se water application (ship and submarine parts, offshore industry), pollution control equipment for environmental protection, nuclear water reactors (reactor-core and control-core components), heat shields, furnace hardware, plant equipment, MIG/TIG electrodes.

Grade 1 is recommended for application where combination of tenisile and rupture properties is requested (above 1038°C). In this condition ductility and toughness at cryogenic temperature are very good.

Grade 2 is recommended for application where the resistance to creep is important (above 815°C) and where cold drawing or cold rolling operation are further requested.  It shows good resistance to many corrosion atmospheres.  It is not used for application below 816°C.

Above 650°C both grades could be used.
(When this alloy is requested for applications below 649°C another heat treatment is recommended (900°C + air quench).

Corrosion and Oxidation Resistance

This alloy exhibits high resistance to corrosive attack in a wide variety of environments. The combination of Nickel and Chromium provides to oxdising media, while the combination of Nickel and Molybdenum provides resistance to reducing conditions, however the Columbium content prevents intergranular corrosion and the Molybdenum content enhances the resistance to pitting and crevice corrosion.  At high temperatures this grade maintains good resistance to scaling and oxidation.

Cold Working

This grade can be cold formed by standard processes.  Generally after cold working with more than 15% deformation a solution annealed heat treatment (grade 2) is required.

Technical Data Sheets