1.7321 (20MoCr4)

Classification

Country Section Category
Germany Structural, Pressure Vessel and Engineering Steels Cr-Mo with Mo ≥ 0.35%

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % P, % C, % S, % Mo, %
97.21–98.43 < 0.4 0.7–1 0.3–0.6 < 0.025 0.17–0.23 < 0.035 0.4–0.5

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\psi$$, % Treatment
540–670 57–62

Brinell hardness number

Rolling Standard Classifiers Value, HBW
improved machinability 255
annealing, soft 207
specified strength 156–207
specified strength, ferrite-pearlite composition 140–187

Standards

Standard Description
EN 10084
EN 10263-3

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
P % Phosphorus
C % Carbon
S % Sulfur
Mo % Molybdenum

Description of mechanical properties

Parameter Units of measurement Description
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\psi$$ % Reduction in cross section on fracture