12H25N16G7AR (EI835)
Turbine industry: details of gas pipeline systems, combustion chambers, diaphragms, sheet metal parts at t-re up to 1050 degrees. 7760kg / m3.
sheet, wire, tube, strip, parts operating up to 950 ° C at moderate voltages.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Heat resistant steels and alloys |
Heat resistant high alloy steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
B, % |
Mn, % |
Cr, % |
Ni, % |
P, % |
C, % |
S, % |
|---|
| GOST 5632-72 |
47.815–57 |
< 1 |
< 0.01 |
5–7 |
23–26 |
15–18 |
< 0.035 |
< 0.12 |
< 0.02 |
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 |
196.5 |
|
13.82 |
7820 |
1.06 |
| 100 |
189.4 |
16.6 |
15.07 |
|
1.1 |
| 200 |
181.5 |
16.2 |
16.33 |
|
1.17 |
| 300 |
174 |
16.8 |
17.59 |
|
1.2 |
| 400 |
166 |
17.4 |
19.26 |
|
1.24 |
| 500 |
159.5 |
18 |
20.94 |
|
1.28 |
| 600 |
149.5 |
18.3 |
22.19 |
|
1.31 |
| 700 |
141 |
18.5 |
23.87 |
|
1.33 |
| 800 |
133.5 |
18.7 |
25.54 |
|
1.36 |
| 900 |
130 |
18.9 |
27.63 |
|
1.39 |
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
Treatment |
|---|
| Rod |
GOST 5949-75 |
< 60 |
|
|
690 |
325 |
40 |
45 |
Hardening of 1050-1150 ° C, air cooling |
| The plates |
GOST 7350-77 |
|
|
|
740 |
390 |
50 |
|
Hardening of 1050-1150 ° C, cooling water |
| Sheet |
GOST 5582-75 |
|
|
|
980 |
|
35 |
|
Hardening of 1050-1100 ° C, cooling water |
| Sheet |
GOST 4986-79 |
|
|
|
690 |
|
15–30 |
|
Hardening of 1050-1100 ° C, air |
| Profile |
|
|
Longitudinal |
|
700 |
330 |
40 |
|
Heating of 1100-1150 ° C, air |
Technological Properties
Analogues
| Germany |
USA |
|---|
| BGH 2.4951 |
SPEC MIL-E-21562 (EN6N) |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| B |
% |
Bor |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ni |
% |
Nickel |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
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 |
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 |
|
|