1.6311 (20MnMoNi4-5)

Classification

Country	Section	Category
Germany	Structural, Pressure Vessel and Engineering Steels	Ni-Mo, Ni-Mo-Mn, Ni-Mo-Cu, Ni-Mo-V, Ni-Mn-V

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	N, %
	96.008–98	< 0.4	1–1.5	< 0.2	< 0.2	0.4–0.8	< 0.02	< 0.02	0.15–0.23	< 0.01	0.45–0.6	< 0.012

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\epsilon_L$ , %	$\epsilon_T$ , %	$R_{eH}$ , $MPa$	$KV_{T}$ , $J$	Treatment
		< 40		moderate hardening	590–750	470	17–18	14		27
		40–60		moderate hardening	590–730	460
		60–150		moderate hardening	570–710
		150–250		moderate hardening	560–700	400
		60–100		moderate hardening		450
		100–150		moderate hardening		440
		< 160		moderate hardening					420
		160–330		moderate hardening					390

Standards

Standard	Description
EN 10250-3
SEW028
SEW550

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Cu	%	Copper
Ni	%	Nickel
V	%	Vanadium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Mo	%	Molybdenum
N	%	Nitrogen

Description of mechanical properties

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)
$R_{eH}$	$MPa$	Upper yield point
$KV_{T}$	$J$	Impact energy (transverse)