1.7729 (20CrMoVTiB4-10)

Classification

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

Chemical composition

Standard	Fe, %	Si, %	B, %	Sn, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	V, %	Al, %	As, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	B, %	Sn, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	V, %	Al, %	As, %	P, %	C, %	S, %	Mo, %
EN 10269	94.8–96.994	< 0.4	0.001–0.01	< 0.02	0.35–0.75	0.9–1.2	0.07–0.15	< 0.2	< 0.2	0.6–0.8	0.015–0.08	< 0.02	< 0.02	0.17–0.23	< 0.02	0.9–1.1

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{0.2}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KV_{L}$ , $J$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{0.2}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KV_{L}$ , $J$	Treatment
				moderate hardening	820–1000	660	15	50	27–40

Standards

Standard	Description
Standard	Description
EN 10269

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Sn	%	Tin
Mn	%	Manganese
Cr	%	Chrome
Ti	%	Titan
Cu	%	Copper
Ni	%	Nickel
V	%	Vanadium
Al	%	Aluminium
As	%	Arsenic
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Mo	%	Molybdenum

Description of mechanical properties

Parameter	Units of measurement	Description
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)
$\psi$	%	Reduction in cross section on fracture
$KV_{L}$	$J$	Impact energy (longitudinal)