1.7218 (25CrMo4)
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, % |
|
96.85–98.13 |
< 0.4 |
0.6–0.9 |
0.9–1.2 |
< 0.025 |
0.22–0.29 |
< 0.035 |
0.15–0.3 |
Information on suppliers
Physical characteristics
Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
100 |
|
11.1 |
200 |
206 |
12.1 |
300 |
181 |
12.9 |
400 |
172 |
13.5 |
500 |
162 |
13.9 |
600 |
152 |
14.1 |
Mechanical properties at 20 °C
Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{Y}$$, $$MPa$$ |
$$\sigma_{0.2}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\epsilon_{L (L_0 = 80 mm)}$$, % |
$$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$$, % |
$$\epsilon_T$$, % |
$$R_{eH}$$, $$MPa$$ |
$$\psi$$, % |
$$KV_{L}$$, $$J$$ |
$$KV_{T}$$, $$J$$ |
Treatment |
|
|
< 16 |
|
moderate hardening |
900–1100 |
|
|
18 |
|
12 |
15 |
700 |
50 |
45–50 |
27–32 |
|
|
|
16–40 |
|
moderate hardening |
800–950 |
|
|
|
|
14 |
|
600 |
55 |
|
|
|
|
|
40–100 |
|
moderate hardening |
700–850 |
|
|
|
|
15 |
|
450 |
60 |
|
|
|
|
|
100–160 |
|
moderate hardening |
650–800 |
|
|
|
|
16 |
|
400 |
60 |
|
|
|
|
|
160–330 |
|
moderate hardening |
600 |
|
|
|
|
|
|
380 |
|
|
|
|
|
|
0.3–3 |
|
annealing, soft |
580 |
|
440 |
|
19 |
|
|
|
|
|
|
|
|
|
0.3–3 |
|
moderate hardening |
990–1400 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
annealing, carbide spheroidization |
580 |
|
|
|
|
|
|
|
59 |
|
|
|
|
|
|
|
solid, cold drawn |
720 |
|
|
4 |
|
|
|
|
|
|
|
|
|
|
|
|
soft, cold drawn |
670 |
|
|
6 |
|
|
|
|
|
|
|
|
|
|
< 60 |
|
moderate hardening |
|
345–355 |
|
|
|
|
|
|
|
|
|
|
Brinell hardness number
Rolling |
Standard |
Classifiers |
Value, HBW |
|
|
improved machinability |
255 |
|
|
annealing, soft |
212 |
Твёрдость по Викерсу
Rolling |
Standard |
Classifiers |
Value, HV |
|
|
annealing, soft |
175 |
|
|
moderate hardening |
305–435 |
Analogues
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 physical characteristics
Parameter |
Units of measurement |
Description |
$$E\cdot 10^{9}$$ |
$$MPa$$ |
Elastic modulus |
$$\alpha\cdot 10^{6}$$ |
$$K^{-1}$$ |
Coefficient of thermal (linear) expansion (range 20°C–T) |
Description of mechanical properties
Parameter |
Units of measurement |
Description |
$$\sigma_{Y}$$ |
$$MPa$$ |
Yield strength |
$$\sigma_{0.2}$$ |
$$MPa$$ |
Tensile stress required to produce a total elongation of 0.2% |
$$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
$$\epsilon_L$$ |
% |
Elongation at break (longitudinal) |
$$\epsilon_{L (L_0 = 80 mm)}$$ |
% |
Elongation at break (longitudinal) (for L0 = 80 mm) |
$$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$$ |
% |
Elongation at break (longitudinal) (for L0 = 5.65√So) |
$$\epsilon_T$$ |
% |
Elongation at break (transverse) |
$$R_{eH}$$ |
$$MPa$$ |
Upper yield point |
$$\psi$$ |
% |
Reduction in cross section on fracture |
$$KV_{L}$$ |
$$J$$ |
Impact energy (longitudinal) |
$$KV_{T}$$ |
$$J$$ |
Impact energy (transverse) |