1.7709 (21CrMoV5-7)
Classification
| Country |
Section |
Category |
| Germany |
Structural, Pressure Vessel and Engineering Steels |
Cr-Mo-V |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Ni, % |
V, % |
Al, % |
P, % |
C, % |
S, % |
Mo, % |
|---|
| EN 10269 |
95.21–97.48 |
< 0.4 |
0.4–0.8 |
1.2–1.5 |
< 0.6 |
0.2–0.35 |
< 0.03 |
< 0.03 |
0.17–0.25 |
< 0.03 |
0.55–0.8 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{0.2}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
$$KV_{L}$$, $$J$$ |
Treatment |
|---|
|
|
|
|
moderate hardening |
700–850 |
550 |
16 |
60 |
63 |
|
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
|
|
annealing, carbide spheroidization |
229 |
|
|
improved machinability |
255 |
Analogues
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ni |
% |
Nickel |
| V |
% |
Vanadium |
| Al |
% |
Aluminium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
| Mo |
% |
Molybdenum |
Description of mechanical properties
| Parameter |
Units of measurement |
Description |
| $$\sigma_{0.2}$$ |
$$MPa$$ |
Tensile stress required to produce a total elongation of 0.2% |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
| $$\epsilon_L$$ |
% |
Elongation at break (longitudinal) |
| $$\psi$$ |
% |
Reduction in cross section on fracture |
| $$KV_{L}$$ |
$$J$$ |
Impact energy (longitudinal) |