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

CIS, Russia, Ukraine
20HM
30HMA

Standards

Standard Description
EN 10083-1
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 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)