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

Standard Description
EN 1008З-1
EN 10132-3

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