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Alloy ЭК79

Designation

Name The value
Designation GOST Cyrillic ЭК79
Designation GOST Latin EK79
Transliteration EhK79
The chemical elements -

Description

Alloy ЭК79 used: for the manufacture of forgings and stampings parts, blades centrifugal compressor wheel; turbine disks and high-pressure compressor gas turbine engine (GTE), operating at temperatures up to +800 °C and briefly up to +850 °C.

Note

Alloy high strength high heat resistance.

Standards

Name Code Standards
Bulls. Blanks. Slabs В31 TU 14-131-824-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Al V B Ti Mo Nb W Ce Co Nd Mg La
TU 14-131-824-90 0.04-0.08 ≤0.01 ≤0.015 ≤0.4 10-12 ≤0.3 The rest ≤1 ≤0.07 2.8-3.3 0.4-0.8 ≤0.01 2.4-3 4-5 2.5-3 2-3 ≤0.015 12.5-16 ≤0.005 ≤0.1 ≤0.08
Ni is the basis.
According to TU 14-131-824-90 the chemical composition is given for the alloy EC79-ID. Lanthanum, neodymium, boron, cerium and magnesium are introduced into the metal by calculation and chemical analysis are not determined. In the finished metal, deviations in the content of titanium, aluminum, niobium and vanadium by ± 0.10%, carbon -0.010%, boron +0.005% are allowed. The introduction of niodime is allowed together with cerium in the composition of misch metal in an amount corresponding to the data in the table.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2 Brinell hardness number, MPa
Forgings (washers). Annealing in air 1130-1150 °C (delay of 4-8 h) + 1 Aging at 840-870 °C (exposure 6 h), air cooling + 2 Aging at 770-790 °C (aging 10-16 h), air cooling
≥895 ≥1270 ≥13 ≥14 ≥343 311-376

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

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