GH2696 is a deformed superalloy with molybdenum and niobium as the main strengthening element. The long-term service temperature is below 650 °C, and the short-term service temperature can reach 750 °C. The alloy has high yield strength, durability and creep strength, as well as good high temperature elastic properties, gas corrosion resistance and processing plasticity. It is suitable for the manufacture of turbine and compressor fasteners, discs, and working blades, turbine casings, annular parts (including connecting rings) that work for a long time below 650°C, and circular helixes that work at 400°C-650°C spring etc.
GH2696 features and application areas:
Similar alloys are widely used abroad to make various high-temperature parts of aero-engines, and have long-term and reliable use experience. Our country uses this alloy to make various parts such as quick-release rings, fasteners, springs, pipe joints, mounting seats and brackets on various engines, and has passed the use assessment and has been mass-produced and used.
The alloy has satisfactory oxidation resistance and gas corrosion resistance below 700 °C, and is resistant to stress corrosion in a salt spray atmosphere. The alloy has satisfactory corrosion resistance in all weather conditions. When the alloy is aged at 800ºC for a long time, a large number of rod-shaped Laves phases are precipitated in the grain boundaries and within the grains, which reduces the strength and toughness significantly.
Chemical composition of Gh2696:
C:≤0.1
Cr: 10~12.5
Ni: 21~25
Mo: 1.0~1.6
W:
Al: ≤0.08
Nb:
Ti: 2.6~3.2
Fe: surplus
Si: ≤0.6
Mn: ≤0.6
P:≤0.02
S:≤0.01
B:≤0.02
GH2696 corresponding grade
GH696, GH696M, ЭИ33, ЭИ696M, 10X11H23T3MP (Russia))
Gh2696 heat treatment method:
Hot rolled bars and forged bars: 1100ºC for 1-2h, water cooling +780ºC for 16h, furnace cooling to 650ºC for 16h, air cooling.
Cold rolled strip: 950ºC-1050ºC, air cooling +700ºC heat preservation for 3-5h, furnace cooling to 650ºC, air cooling.
Gh2696 implementation standard:
Bars\forgings: GB/T25828, GB/T25830, GB/T14994, GJB2611A, HB5463, HB5464, enterprise standard
Cold/rolled sheet: GB/T25827, GJB1952, GJB3318A, HB5465, HB5466, enterprise standard
Cold drawing material: HB5467
GH2696 chemical properties:
Oxidation resistance: The alloy has satisfactory oxidation resistance and gas corrosion resistance below 700 °C.
Corrosion resistance: The alloy has satisfactory hot corrosion resistance under all weather conditions.
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