BT20
parts, continuously operating at temperatures up to 500 °; good corrosion resistance; class structure pseudo α
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Titanium, titanium alloys |
Wrought Titanium Alloys |
Chemical composition
| Standard |
Fe, % |
Si, % |
Ti, % |
V, % |
Zr, % |
Al, % |
C, % |
O, % |
Mo, % |
N, % |
H, % |
|---|
| GOST 19807-91 |
< 0.25 |
< 0.15 |
85.15–91.4 |
0.8–2.5 |
1.5–2.5 |
5.5–7 |
< 0.1 |
< 0.15 |
0.5–2 |
< 0.05 |
< 0.015 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ |
$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$ |
|---|
| 20 |
112 |
|
8 |
4450 |
|
1.11 |
| 100 |
|
8.3 |
8.8 |
|
|
|
| 200 |
|
8.3 |
10.2 |
|
0.587 |
|
| 300 |
|
9 |
10.9 |
|
0.628 |
|
| 400 |
|
9.2 |
12.2 |
|
0.67 |
|
| 500 |
|
9.3 |
13.8 |
|
0.712 |
|
| 600 |
|
9.5 |
15.1 |
|
|
|
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ |
Treatment |
|---|
| Sheet annealed. |
GOST 22178-76 |
|
|
annealing |
930–980 |
6–12 |
|
|
|
| Round |
GOST 26492-85 |
|
|
|
885 |
7–8 |
20 |
250–300 |
|
| Round |
GOST 26492-85 |
|
|
enhanced quality |
885–1130 |
8–10 |
20–25 |
300–400 |
|
| Sheet |
GOST 23755-79 |
11–100 |
|
|
880–1130 |
5–6 |
10–12 |
300 |
|
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
|
|
|
255–341 |
Technological Properties
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Ti |
% |
Titan |
| V |
% |
Vanadium |
| Zr |
% |
Zirconium |
| Al |
% |
Aluminium |
| C |
% |
Carbon |
| O |
% |
Oxygen |
| Mo |
% |
Molybdenum |
| N |
% |
Nitrogen |
| H |
% |
Hydrogen |
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 |
| $$c\cdot 10^{-3}$$ |
$$\frac{J}{kg\cdot K}$$ |
The specific heat of the material (range 20°C–T) |
| $$R\cdot 10^{-6}$$ |
$$\Omega\cdot m$$ |
Electrical resistivity |
Description of mechanical properties
| Parameter |
Units of measurement |
Description |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
| $$\epsilon_L$$ |
% |
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 |
|
|