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

CIS, Russia, Ukraine
25H1M1F
EI723

Standards

Standard Description
EN 10269

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)