1.7243 (18CrMo4)
Classification
| Country |
Section |
Category |
| Germany |
Structural, Pressure Vessel and Engineering Steels |
Cr-Mo with Mo < 0.35%, Cr-Mo-B |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
P, % |
C, % |
S, % |
Mo, % |
|---|
|
96.98–98.2 |
< 0.4 |
0.6–0.9 |
0.9–1.2 |
< 0.025 |
0.15–0.21 |
< 0.035 |
0.15–0.25 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
$$KV_{L}$$, $$J$$ |
Treatment |
|---|
|
|
< 16 |
|
|
1100 |
|
57–62 |
|
|
|
|
< 160 |
|
moderate hardening |
485–660 |
20 |
|
50 |
|
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
|
|
annealing, soft |
207 |
|
|
specified strength |
156–207 |
|
|
specified strength, ferrite-pearlite composition |
140–187 |
Standards
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 |
| $$\epsilon_L$$ |
% |
Elongation at break (longitudinal) |
| $$\psi$$ |
% |
Reduction in cross section on fracture |
| $$KV_{L}$$ |
$$J$$ |
Impact energy (longitudinal) |