Sheet, round, wire KHN77TJU - ЭИ437А
International Equivalent
| Mark | Analogue | W. Nr. | Aisi Uns | En | Order |
|---|---|---|---|---|---|
| ХН77ТЮ | EI437A | ~2.4952 | ~N07080 | ~~NiCr20TiAl | Delivery from the stock, in stock |
| ХН77ТЮРБ | EI437A | Delivery from the stock, in stock |
Relevance
High-temperature alloy grade KHN77TJU (ЭИ437А) on a Nickel basis is applied in the production of disks, rings, turbine blades, operated at t° to 750 °C. In modern engines the material for parts of turbines should have a high resistance to fracture at low-cycle and thermal fatigue, which is today the main cause of the destruction. The danger of destruction may be exacerbated by surface reactions, which are associated with weakening of grain boundaries, gas corrosion. The main material requirements for turbine blades is caused by the latest developments of engine design, high ductility, heat resistance, resistance to low cycle and thermal fatigue, and resistance to gas environments. The hardness of the rod brand KHN77TJU according to GOST 23 705−79 is HB 10−1 = 255 — 321МПа.
The percentage composition of (GOST 5632−72)
| Si | C | Fe | Mn | P | S | Ni | Cr | Al | Ti | Ce | Pb | B |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| to 0.6 | to 0.07 | to 1 | to 0.4 | to 0.015 | to 0.007 | 70.083 — 77.4 | 19 — 22 | 0.6 — 1 | 2.4 — 2.8 | up to 0.02 | to 0.001 | up to 0.003 |
Mechanical properties at t° 20 °C.
| Products | Eg. | Size | d5 | y | blower SB | sT | Heat treatment. | KCU |
|---|---|---|---|---|---|---|---|---|
| - | - | mm | % | % | MPa | MPa | - | kJ / m2 |
| Rod, GOST 23 705−79, temperature-700 °C | 5 | 12 | 610 | Aging and annealing |
The physical properties of the alloy:
| Description | Marking |
|---|---|
| Temperature obtain information about the alloy [Hail] | — T |
| — The modulus of elasticity of the 1st kind [MPa] | — E |
| — Coefficient of thermal linear expansion (at 20°C) [1/Deg] | -a |
| — Electrical resistivity [Ohm·m] | -R |
| — Specific gravity [g/cm3] | -r |
| — Thermal conductivity coefficient [W/(m·deg)] | -l |
| — Specific heat (at 20°C) [j/(kg·deg)] | -C |
Mechanical properties:
| Description | Marking |
|---|---|
| — The limit of proportionality (yield strength for permanent deformation) [MPa] | sT |
| — Short-term strength [MPa] | blower SB |
| Contraction ratio [ % ] | y |
| The elongation at break [ % ] | d5 |
| — Brinell hardness number, [MPa] | HB |
| — Impact strength [ kJ / m2] | KCU |
| Marking | Description |
|---|---|
| limited weldability | — required pre-heating to a temperature of 100−120°C with the final heat treatment |
| without restrictions | — no need for pre-heating and the final heat treatment |
| Difficult weldability | — required pre-heating to a temperature of 200−300°C with the final heat treatment |
Buy at best price
Range of brand products KHN77TJU from company «Electrocentury-steel» will satisfy any customer. Price is determined by the technological features of production without the inclusion of additional costs. All products are certified. It is very easy to buy wholesale essential products for large-scale projects, we also offer favorable terms to retail customers. Technological equipment of each production stage enables us to fulfil individual orders for non-standard settings. The products are manufactured with strict adherence to the requirements of the technological process that guarantees the highest quality, stored under cover or indoors to protect from mechanical damage, contact with moisture and corrosive substances. The timing of orders is minimal. Wholesale customers receive discounts.
