1.5521 (18MnB4)

Classification

Country	Section	Category
Country	Section	Category
Germany	Structural, Pressure Vessel and Engineering Steels	B, Mn-B Mn < 1.65%

Chemical composition

Standard	Fe, %	Si, %	B, %	Mn, %	Cu, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cu, %	P, %	C, %	S, %
EN 10263-3	97.995–98.9392	< 0.3	0.0008–0.005	0.9–1.2	< 0.25	< 0.025	0.16–0.2	< 0.025

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\psi$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\psi$ , %	Treatment
					480–680	53–64

Standards

Standard	Description
Standard	Description
EN 10263-3

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
Cu	%	Copper
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\psi$	%	Reduction in cross section on fracture