Alloy KH27JU5T (ЭИ626)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Х27Ю5Т |
| Designation GOST Latin |
X27Ju5T |
| Transliteration |
H27Yu5T |
| The chemical elements |
Cr27Al5Te |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ626 |
| Designation GOST Latin |
EI626 |
| Transliteration |
EhI626 |
| The chemical elements |
- |
Description
Alloy KH27JU5T used: for the manufacture of electric heating elements furnaces with maximum operating temperature 1350 °C; the heating elements and resistance elements.
Note
The heat resisting alloy in an oxidizing atmosphere containing sulfur and sulfur compounds, carbon, hydrogen, vacuum, working with high-alumina ceramics, is not prone to pitting corrosion, is prone to sagging at high temperatures can not withstand sudden dynamic loads.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 10994-74 |
| Steel alloy wire |
В73 |
GOST 12766.1-90, TU 14-1-1380-75, TU 14-131-820-90 |
| Tapes |
В34 |
GOST 12766.2-90 |
| Sectional and shaped rolling |
В32 |
GOST 12766.3-90, GOST 12766.4-90, TU 14-11-245-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Al |
Ti |
Ca |
Ce |
Zr |
Ba |
| GOST 10994-74 |
≤0.05 |
≤0.015 |
≤0.02 |
≤0.3 |
26-28 |
≤0.6 |
≤0.6 |
The rest |
5-5.8 |
0.15-0.4 |
≤0.1 |
≤0.1 |
0.1 |
≤0.5 |
Fe is the basis.
In accordance with GOST 10994-74, the content of calcium, cerium and barium is calculated. When smelting an alloy intended for the production of heating elements, fresh charge materials should be used. Waste of own marks may be used.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
d |
y, % |
Brinell hardness number, MPa |
| Cold-rolled steel strip of 0.2-3.2 mm in the delivery state according to GOST 12766.2-90 |
|
- |
≤785 |
≥10 |
- |
- |
200-250 |
| Wire cross section of 0.1-7.5 mm. Heat to 760 °C (exposure 30 min), cooling in water |
| - |
≥534 |
≥663 |
≥16 |
- |
- |
- |
| Wire cold-drawn heat-treated in the delivery condition according to GOST 12766.1-90 (the value is δ200) |
|
- |
≤780 |
- |
≥10 |
- |
- |
| Wire cross section of 0.1-7.5 mm. Heat to 760 °C (exposure 30 min), cooling in water |
| - |
≥425 |
≥660 |
≥24 |
- |
≥62 |
- |
| Wire. Heating to 760 °C (exposure 30 min), cooling in water |
| 0.1-7.5 |
≥534 |
≥663 |
≥16 |
- |
- |
- |
| Wire cross section of 0.1-7.5 mm. Heat to 760 °C (exposure 30 min), cooling in water |
| - |
≥357 |
≥605 |
≥25 |
- |
≥53 |
- |
| - |
≥354 |
≥375 |
≥33 |
- |
≥71 |
- |
| - |
- |
≥87 |
≥76 |
- |
≥97 |
- |
| - |
- |
≥13 |
≥127 |
- |
- |
- |
| - |
- |
≥9 |
≥118 |
- |
- |
- |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
Physical characteristics
| Temperature |
r, кг/м3 |
R, НОм · м |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 20 |
7190 |
1360 |
- |
500 |
| 100 |
- |
1365 |
- |
- |
| 200 |
- |
1370 |
- |
- |
| 300 |
- |
1375 |
- |
- |
| 400 |
- |
1380 |
- |
- |
| 500 |
- |
1400 |
- |
- |
| 600 |
- |
1400 |
- |
- |
| 700 |
- |
1410 |
- |
- |
| 800 |
- |
1410 |
- |
690 |
| 900 |
- |
1420 |
- |
- |
| 1000 |
- |
- |
15 |
- |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
| С |
Specific heat |
Technological properties
| Name |
The value |
| Weldability |
Welding methods - RDS and ADS. Welding heaters with operating temperatures above 1100 C produced by direct current with electrodes of the same material with a plaster finish 0.3 L-8. Welding heaters with operating temperatures up to 1100 C produced in conventional electrodes made of heat-resistant materials. ADS - non-consumable electrode with use of filler material alloy KH27JU5T. When welding of the heaters is necessary to cover them with asbestos sheets to prevent splashing and damage to the wire in this place. |
| Propensity to temper brittleness |
Inclined in the temperature range 400-500 °C. |
| Forging temperature |
Start - 1150 °C, the end - 1000 °C. |
| Flock-sensitive sensitivity |
not sensitive. |
| Microstructure |
Ferritic structure. |
| Magnetic properties |
Ferromagnetic alloy. |
| Vitality |
Survivability at a temperature of 1300 °C for at least 80 hours. |
| Vitality of the alloy for heating elements |
At least 80 hours at a test temperature of 1300 °C. maximum recommended operating temperature of the heating element from 950 °C at a thickness of 0.2 mm to 1350 °C at a thickness ≥ 6.0 mm. |
