Alloy ЭК79
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Alloy EC79
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.
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 |
