1.5663 (X7Ni9)

Classification

Country	Section	Category
Country	Section	Category
Germany	Structural, Pressure Vessel and Engineering Steels	Ni

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	Mn, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %
EN 10028-4	88.62–91.2	< 0.35	0.3–0.8	8.5–10	< 0.01	< 0.015	< 0.1	< 0.005	< 0.1

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\epsilon_L$ , %	$KV_{L}$ , $J$	$KV_{T}$ , $J$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	$\epsilon_L$ , %	$KV_{L}$ , $J$	$KV_{T}$ , $J$	Treatment
		< 50		moderate hardening	680–820		18	120	100
		< 30		moderate hardening		585
		30–50		moderate hardening		575

Standards

Standard	Description
Standard	Description
EN 10028-4

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Ni	%	Nickel
V	%	Vanadium
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)
$KV_{L}$	$J$	Impact energy (longitudinal)
$KV_{T}$	$J$	Impact energy (transverse)