Alloy KHN77TJU (ЭИ437А)

Designation

Name The value
Designation GOST Cyrillic ХН77ТЮ
Designation GOST Latin XH77TJu
Transliteration HN77TYu
By chemical elements CrNi77TeAl
Name The value
Designation GOST Cyrillic ЭИ437А
Designation GOST Latin EI437A
Transliteration EhI437A
By 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
Bars and shapes В32 GOST 23705-79, TU 14-1-402-72, TU 14-1-75-71, TU 14-1-764-73
Blanks. Of the workpiece. Slabs В31 OST 1 90335-82, OST 1 90374-87, TU 14-1-1214-75
Sheets and strips В33 TU 14-1-146-71, TU 14-1-5103-92
Bars В55 TU 14-1-3175-81
Welding and cutting 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 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 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 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 properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % HB, 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
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
HB Brinell hardness number