1.7271 (23CrMoB3-3)

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, %	B, %	Mn, %	Cr, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	P, %	C, %	S, %	Mo, %
	97.125–97.9492	0.15–0.35	0.0008–0.005	0.7–0.9	0.7–0.9	< 0.035	0.2–0.25	< 0.035	0.3–0.4

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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			1180–1470	> 835	> 7	> 30	> 27	After carburization, in the core
		< 30			1080–1370	> 785	> 8	> 35	> 27	Cementation, in the core

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
		soft, average vacation	< 217

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
Cr	%	Chrome
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Mo	%	Molybdenum

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