1.7225 (42CrMo4)
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, % |
|
96.69–97.97 |
< 0.4 |
0.6–0.9 |
0.9–1.2 |
< 0.025 |
0.38–0.45 |
< 0.035 |
0.15–0.3 |
Information on suppliers
Mechanical properties at 20 °C
Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{0.2}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\epsilon_{L (L_0 = 80 mm)}$$, % |
$$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$$, % |
$$\epsilon_T$$, % |
$$R_{eH}$$, $$MPa$$ |
$$\psi$$, % |
$$KV_{L}$$, $$J$$ |
$$KV_{T}$$, $$J$$ |
Treatment |
|
|
< 16 |
|
moderate hardening |
1100–1300 |
|
|
|
10 |
10–14 |
900 |
40 |
30–35 |
22 |
|
|
|
16–40 |
|
moderate hardening |
1000–1200 |
|
|
|
11 |
|
750 |
45 |
|
|
|
|
|
40–100 |
|
moderate hardening |
900–1100 |
|
|
|
12 |
|
650 |
50 |
|
|
|
|
|
100–160 |
|
moderate hardening |
800–950 |
|
|
|
13 |
|
500–550 |
50 |
|
|
|
|
|
160–250 |
|
moderate hardening |
750–900 |
|
|
|
14 |
|
|
55 |
|
|
|
|
|
250–330 |
|
moderate hardening |
700 |
|
|
|
|
|
|
|
|
|
|
|
|
330–660 |
|
moderate hardening |
600 |
|
|
|
|
|
390 |
|
|
|
|
|
|
0.3–3 |
|
annealing, soft |
620 |
480 |
|
15 |
|
|
|
|
|
|
|
|
|
|
|
annealing, carbide spheroidization |
630 |
|
|
|
|
|
|
57 |
|
|
|
|
|
< 8 |
|
moderate hardening |
1100 |
|
|
|
|
|
|
|
|
|
|
|
|
8–20 |
|
moderate hardening |
1000 |
|
|
|
|
|
|
|
|
|
|
|
|
20–50 |
|
moderate hardening |
900 |
|
|
|
|
|
|
|
|
|
|
|
|
50–80 |
|
moderate hardening |
800 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
solid, cold drawn |
720 |
|
4 |
|
|
|
|
|
|
|
|
|
|
|
|
soft, cold drawn |
670 |
|
6 |
|
|
|
|
|
|
|
|
|
|
160–330 |
|
moderate hardening |
|
|
|
|
|
|
460–500 |
|
|
|
|
Brinell hardness number
Rolling |
Standard |
Classifiers |
Value, HBW |
|
|
improved machinability |
255 |
|
|
annealing, soft |
241 |
Твёрдость по Викерсу
Rolling |
Standard |
Classifiers |
Value, HV |
|
|
annealing, soft |
195 |
|
|
moderate hardening |
340–490 |
Technological Properties
Weldability |
Difficult to weld |
Analogues
CIS, Russia, Ukraine |
38HM |
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 |
$$\sigma_{0.2}$$ |
$$MPa$$ |
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) |
Designation of types of weldability
Parameter |
Units of measurement |
Description |
no limits |
|
Welding is performed without heating and without subsequent heat treatment |
Boundedly welded |
|
Welding is possible with heating up to 100–120 °C and subsequent heat treatment |
Difficult to weld |
|
For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing |
Not applicable for welded structures |
|
|