1.7779 (20CrMoV13-5-5)

Classification

Country	Section	Category
Country	Section	Category
Germany	Structural, Pressure Vessel and Engineering Steels	Cr-Mo-V

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	Al, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	Al, %	P, %	C, %	S, %	Mo, %
EN 10216-2	93.795–95.43	0.15–0.35	0.3–0.5	3–3.3	< 0.3	< 0.3	0.45–0.55	< 0.04	< 0.025	0.17–0.23	< 0.01	0.5–0.6

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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	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{Y}$$, $$MPa$$	$$\epsilon_L$$, %	$$\epsilon_T$$, %	$$KV_{L}$$, $$J$$	$$KV_{T}$$, $$J$$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{Y}$$, $$MPa$$	$$\epsilon_L$$, %	$$\epsilon_T$$, %	$$KV_{L}$$, $$J$$	$$KV_{T}$$, $$J$$	Treatment
				moderate hardening	740–880	590	16	14	40	27

Standards

Standard	Description
Standard	Description
EN 10216-2

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Cu	%	Copper
Ni	%	Nickel
V	%	Vanadium
Al	%	Aluminium
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
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\epsilon_L$$	%	Elongation at break (longitudinal)
$$\epsilon_T$$	%	Elongation at break (transverse)
$$KV_{L}$$	$$J$$	Impact energy (longitudinal)
$$KV_{T}$$	$$J$$	Impact energy (transverse)