1.7189 (39MnCrB6-2)

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, %	B, %	Mn, %	Cr, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	P, %	C, %	S, %
EN 10083-3	96.815–97.9392	< 0.4	0.0008–0.005	1.4–1.7	0.3–0.6	< 0.025	0.36–0.42	< 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	1100–1350	12	900	50
		16–40		moderate hardening	1050–1250	12	850	50
		40–100		moderate hardening	1000–1200	12	800	50

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
		improved machinability	255

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
Cr	%	Chrome
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