1.7147 (20MnCr5)

Classification

Country	Section	Category
Country	Section	Category
Germany	Structural, Pressure Vessel and Engineering Steels	Cr-Si, Cr-Mn, Cr-Mn-B, Cr-Si-Mn

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	P, %	C, %	S, %
EN 10084	96.62–97.73	< 0.4	1.1–1.4	1–1.3	< 0.025	0.17–0.22	< 0.035

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KU$ , $J$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KU$ , $J$	Treatment
		< 11			1080–1370	> 735	> 7	> 30	> 34	After carburization, in the core
		< 30			980–1270	> 685	> 8	> 35	> 34	Cementation, in the core
		< 63			780–1080	> 540	> 10	> 35		Cementation, in the core

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
		improved machinability	255
		annealing, soft	217
		specified strength	170–217
		specified strength, ferrite-pearlite composition	152–201
		normalization	140–201

Standards

Standard	Description
Standard	Description
EN 10084

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

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)
$\psi$	%	Reduction in cross section on fracture
$KU$	$J$	Impact energy