1.7218 (25CrMo4)

Classification

Country	Section	Category
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, %
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

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$
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
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
Rolling	Standard	Classifiers	Value, HBW
		improved machinability	255
		annealing, soft	212

Твёрдость по Викерсу

Rolling	Standard	Classifiers	Value, HV
Rolling	Standard	Classifiers	Value, HV
		annealing, soft	175
		moderate hardening	305–435

Analogues

CIS, Russia, Ukraine
CIS, Russia, Ukraine
20HM
30HMA

Standards

Standard	Description
Standard	Description
EN 10083-1
EN 10132-3

Description of chemical elements

Element	Units of measurement	Description
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
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
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)