BT20
parts, continuously operating at temperatures up to 500 °; good corrosion resistance; class structure pseudo α
Classification
Chemical composition
Standard | Fe, % | Si, % | Ti, % | V, % | Zr, % | Al, % | C, % | O, % | Mo, % | N, % | H, % |
---|---|---|---|---|---|---|---|---|---|---|---|
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 |
---|---|---|---|---|---|---|
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 |
---|---|---|---|---|---|---|---|---|---|
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
Technological Properties
Standards
Standard | Description |
---|---|
Standard | Description |
GOST 19807-91 |
Description of chemical elements
Description of physical characteristics
Parameter | Units of measurement | Description |
---|---|---|
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
Designation of types of weldability
Parameter | Units of measurement | Description |
---|---|---|
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 |