HN70VMYUT (EI765)
Rotors, discs, turbine blades.
fasteners and other parts operating at temperatures up to 750−800 ° C.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Heat resistant steels and alloys |
Heat resistant alloys |
Chemical composition
| Standard |
Fe, % |
Si, % |
B, % |
Mn, % |
Cr, % |
Ti, % |
Cu, % |
Ni, % |
Al, % |
P, % |
C, % |
S, % |
Mo, % |
W, % |
|---|
| GOST 5632-72 |
< 3 |
< 0.6 |
< 0.01 |
< 0.5 |
14–16 |
1–1.4 |
< 0.07 |
65.02–76.29 |
1.7–2.2 |
< 0.02 |
0.01–0.16 |
< 0.02 |
3–5 |
4–6 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$ |
|---|
| 20 |
226 |
|
|
8600 |
1.33 |
| 100 |
221 |
12.2 |
9.2 |
8570 |
1.34 |
| 200 |
215 |
12.65 |
12.6 |
8540 |
1.35 |
| 300 |
209 |
13.2 |
16.7 |
8510 |
1.36 |
| 400 |
202 |
13.6 |
19.2 |
8470 |
1.36 |
| 500 |
196 |
14.1 |
23 |
8430 |
1.37 |
| 600 |
190 |
14.55 |
25.9 |
8390 |
1.47 |
| 700 |
182 |
15.1 |
29.3 |
8340 |
1.48 |
| 800 |
|
15.8 |
|
8290 |
|
| 900 |
|
|
|
8240 |
|
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ |
Treatment |
|---|
| Rod |
|
|
|
|
1030 |
670 |
28 |
26 |
800 |
Heat 1150 ° C, 3 hours, cooling oil, Aging 800 ° C, 20 hours, air cooled |
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
| Alloy |
|
|
277–302 |
Technological Properties
| Weldability |
|---|
| Difficult to weld |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| B |
% |
Bor |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ti |
% |
Titan |
| Cu |
% |
Copper |
| Ni |
% |
Nickel |
| Al |
% |
Aluminium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
| Mo |
% |
Molybdenum |
| W |
% |
Tungsten |
Description of physical characteristics
| Parameter |
Units of measurement |
Description |
| $$E\cdot 10^{9}$$ |
$$MPa$$ |
Elastic modulus |
| $$\alpha\cdot 10^{6}$$ |
$$K^{-1}$$ |
Coefficient of thermal (linear) expansion (range 20°C–T) |
| $$\varkappa$$ |
$$\frac{W}{m\cdot K}$$ |
Coefficient of thermal conductivity (the heat capacity of the material) |
| $$\rho$$ |
$$\frac{kg}{m^3}$$ |
The density of the material |
| $$R\cdot 10^{-6}$$ |
$$\Omega\cdot m$$ |
Electrical resistivity |
Description of mechanical properties
| Parameter |
Units of measurement |
Description |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
| $$\sigma_{P}$$ |
$$MPa$$ |
Proportionality limit |
| $$\epsilon_L$$ |
% |
Elongation at break (longitudinal) |
| $$\psi$$ |
% |
Reduction in cross section on fracture |
| $$KCU\cdot 10^{3}$$ |
$$\frac{J}{m^2}$$ |
Impact toughness |
Designation of types of weldability
| Parameter |
Units of measurement |
Description |
| no limits |
|
Welding is performed without heating and without subsequent heat treatment |
| Boundedly welded |
|
Welding is possible with heating up to 100–120 °C and subsequent heat treatment |
| Difficult to weld |
|
For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing |
| Not applicable for welded structures |
|
|