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KHN77TJU - ЭИ437А sheet, round, wire
High-temperature alloy KHN77TJU (ЭИ437А) Nickel-based used in the manufacture of turbine blades, rings, discs and various other parts which are operated at a temperature not exceeding 750 °C. the Basic material requirements for the manufacture of turbine blades are subject to the latest developments of the designs of engines, a continuous increase in ductility, resistance to low cycle, thermal fatigue, heat resistance and resistance to gas environments. The material in modern engines, turbine blades must have a high resistance to destruction by heat, low cycle fatigue, which today is the main form of destruction. To worsen the danger of destruction capable of surface reactions due to the weakening of grain boundaries and gas corrosion.
Rod according to GOST 23705−79 — the hardness of the alloy KHN77TJU HB 10 -1 = 255 — 321МПа
KHN77TJU chemical composition according to GOST 5632−72, in percentage.
| Pb | Si | C | Fe | Mn | Ni | Cr | Al | Ti | S | B | Mn | P |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| to 0.001 | to 0.6 | to 0.07 | to 1 | to 0.4 | 70.083 — 77.4 | 19 — 22 | 0.6 — 1 | 2.4 — 2.8 | to 0.007 | up to 0.003 | to 0.4 | to 0.015 |
Mechanical properties at temperatures of 20 °C alloy ХН77Ю.
| Products | Eg. | mm | % | - | kJ / m2 | MPa | % | MPa |
|---|---|---|---|---|---|---|---|---|
| - | - | Size | d5 | Heat treatment. | KCU | sT | y | blower SB |
| GOST 23705−79, Rod, temp.700 °C | 5 | Aging, hardening | 12 | 610 |
| Mechanical characteristics: | |||
|---|---|---|---|
| — Short-term tensile strength in [MPa] | blower SB | ||
| — Yield strength (limit of proportionality) for the residual strain, [MPa] | sT | ||
| — at break elongation in [ % ] | d5 | ||
| — narrowing of the relative in [ % ] | y | ||
| — the viscosity of the shock, in [ kJ / m2] | KCU | ||
| — Brinell hardness [MPa] | HB | ||
| Technological characteristics KHN77TJU: | |||||
|---|---|---|---|---|---|
| Welding: | |||||
| weldability limited | — welding is possible in the process of heating up to temp. 100−120? C and further thermal treatment | ||||
| konovalivka | in order to obtain quality welded joints, it is necessary to perform additional operations: during welding heating up to temp. 200−300°C, heat treatment (annealing) after welding. | ||||
| Welded without any restrictions | — welding is carried out without further heat treatment and pre-heating. | ||||
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The company «AVEK global», producing a large range of products from alloy KHN77TJU ready to satisfy the most sophisticated demands of consumers. The widespread use of products that are made from this alloy due to the high quality, huge variety and affordable cost. Absolute control of all stages of the technological process allows the company «AVEK global» to produce high quality metal products. The introduction of modern technologies enables us a base range, which are always in stock at the warehouses of the company, accept orders for manufacturing of metal products for individual orders, even in the case of the need of quality metal products custom options and sizes.