1.6571 (20NiCrMoS6-4)
Classification
| Country |
Section |
Category |
| Germany |
Structural, Pressure Vessel and Engineering Steels |
Cr-Ni-Mo with Mo < 0.4% + Ni < 0.2% |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Ni, % |
P, % |
C, % |
S, % |
Mo, % |
|---|
|
95.455–97.07 |
< 0.4 |
0.5–0.9 |
0.6–0.9 |
1.4–1.7 |
< 0.025 |
0.16–0.23 |
0.02–0.04 |
0.25–0.35 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\psi$$, % |
Treatment |
|---|
|
|
|
|
|
590–730 |
55–60 |
|
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
|
|
improved machinability |
255 |
|
|
annealing, soft |
229 |
|
|
specified strength |
179–229 |
|
|
specified strength, ferrite-pearlite composition |
154–207 |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ni |
% |
Nickel |
| 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 |