1.5530 (20MnB5)

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, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	B, %	Mn, %	P, %	C, %	S, %
EN 10083-3	97.905–98.7292	< 0.4	0.0008–0.005	1.1–1.4	< 0.025	0.17–0.23	< 0.035

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$ , %	$R_{eH}$ , $MPa$	$\psi$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$ , %	$R_{eH}$ , $MPa$	$\psi$ , %	Treatment
		< 16		moderate hardening	900–1050	14	700	55
		16–40		moderate hardening	750–900	15	600	55

Standards

Standard	Description
Standard	Description
EN 10083-3

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
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
$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$	%	Elongation at break (longitudinal) (for L₀ = 5.65√So)
$R_{eH}$	$MPa$	Upper yield point
$\psi$	%	Reduction in cross section on fracture