Alloy KHN77TJU (ЭИ437А)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ХН77ТЮ |
| Designation GOST Latin |
XH77TJu |
| Transliteration |
HN77TYu |
| The chemical elements |
CrNi77TeAl |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ437А |
| Designation GOST Latin |
EI437A |
| Transliteration |
EhI437A |
| The chemical elements |
- |
Description
Alloy KHN77TJU used: for the production of hot-rolled steel plate; welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes.
Note
High-temperature Nickel-based alloy.
The recommended maximum operating temperature for limited time +750 °C. the Temperature of beginning of intensive scaling in air +1050 °C.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
GOST 23705-79, TU 14-1-402-72, TU 14-1-75-71, TU 14-1-764-73 |
| Bulls. Blanks. Slabs |
В31 |
OST 1 90335-82, OST 1 90374-87, TU 14-1-1214-75 |
| Sheets and stripes |
В33 |
TU 14-1-146-71, TU 14-1-5103-92 |
| Bars |
В55 |
TU 14-1-3175-81 |
| Welding and cutting of metals. Soldering, riveting |
В05 |
TU 14-1-997-74, TU 14-1-997-2012 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Al |
B |
Ti |
Pb |
Ce |
| TU 14-1-997-74 |
≤0.06 |
≤0.007 |
≤0.015 |
≤0.4 |
19-22 |
≤0.6 |
The rest |
≤1 |
≤0.07 |
0.55-0.95 |
- |
2.3-2.7 |
≤0.001 |
≤0.02 |
| TU 14-1-146-71 |
≤0.06 |
≤0.007 |
≤0.015 |
≤0.4 |
19-22 |
≤0.6 |
The rest |
≤1 |
≤0.07 |
0.55-0.95 |
≤0.003 |
2.3-2.7 |
≤0.001 |
≤0.02 |
| TU 14-1-5103-92 |
≤0.06 |
≤0.007 |
≤0.015 |
≤0.4 |
19-22 |
≤0.6 |
The rest |
≤1 |
- |
0.55-0.95 |
≤0.003 |
2.3-2.7 |
≤0.001 |
≤0.02 |
Ni is the basis.
According to TU 14-1-5103-92, TU 14-1-146-71, TU 14-1-402-72, TU 14-1-997-74 the chemical composition is given for ХН77ТЮ (ЭИ437А). Boron, cerium and zirconium are introduced into the metal by calculation and chemical analysis are not determined.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
Brinell hardness number, MPa |
| Ring welded at OST 1 90374-87. Heating to 1070-1090 °With, exposure time 8 hours, quenching in air + Ageing at 690-710 °C for 16 hours, air cooling |
|
≥470 |
≥882 |
≥20 |
≥20 |
248-340 |
| Hot-rolled sheet. Heating to 1070-1090 °C (exposure 8 h), air cooling + Ageing at 690-710 °C (aging 16 h), air cooling |
| 4-11 |
≥590 |
≥980 |
≥20 |
- |
- |
| Ring welded at OST 1 90374-87. Heating to 1070-1090 °With, exposure time 8 hours, quenching in air + Ageing at 690-710 °C for 16 hours, air cooling |
|
≥421 |
≥784 |
≥10 |
≥10 |
- |
| Hot-rolled sheet. Heating to 1070-1090 °C (exposure 8 h), air cooling + Ageing at 690-710 °C (aging 16 h), air cooling |
| 4-11 |
- |
≥610 |
≥5 |
- |
- |
| Hot-rolled sheet. Quenching in water, in air or under water shower with 1060-1100 °C |
| 4-11 |
- |
≤880 |
≥30 |
- |
- |
| Bars hot rolled and forged and according to GOST 23705-79. Heating to 1070-1090 °With, exposure time 8 hours, air cooling + Ageing at 690-710 °C for 16 hours, air cooling |
|
- |
≥608 |
≥5 |
≥12 |
- |
|
- |
- |
- |
- |
255-321 |
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 |
