1.8991 (S550A)
Classification
| Country |
Section |
Category |
| Germany |
Structural, Pressure Vessel and Engineering Steels |
High Strength Weldable Steels not Intended for Heat Treatment by User |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Ti, % |
Cu, % |
Ni, % |
V, % |
Al, % |
P, % |
C, % |
S, % |
Nb, % |
Mo, % |
N, % |
|---|
| EN 10137-2 |
92.385–99.67 |
< 0.5 |
0.3–1.8 |
< 0.3 |
< 0.1 |
< 2 |
< 2 |
< 0.1 |
< 0.08 |
< 0.025 |
0.03–0.12 |
< 0.015 |
< 0.06 |
< 0.5 |
< 0.015 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{Y}$$, $$MPa$$ |
$$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$$, % |
$$KV_{L}$$, $$J$$ |
Treatment |
|---|
|
|
|
|
|
650–820 |
530–550 |
16 |
55 |
|
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ti |
% |
Titan |
| Cu |
% |
Copper |
| Ni |
% |
Nickel |
| V |
% |
Vanadium |
| Al |
% |
Aluminium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
| Nb |
% |
Niobium |
| Mo |
% |
Molybdenum |
| N |
% |
Nitrogen |
Description of mechanical properties
| Parameter |
Units of measurement |
Description |
| $$\sigma_{Y}$$ |
$$MPa$$ |
Yield strength |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
| $$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$$ |
% |
Elongation at break (longitudinal) (for L0 = 5.65√So) |
| $$KV_{L}$$ |
$$J$$ |
Impact energy (longitudinal) |