σU
MPa
σP
MPa
ψ
KCU⋅103
Jm2

N18K9M5T

For products with high strength with sufficient ductility and toughness, high resistance to small plastic deformations, brittle and fatigue failure, used in engineering, instrument making and tool industry martensitic-aging steel.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Structural steel	High strength high alloy structural steel

Chemical composition

Standard	Fe, %	Co, %	Ti, %	Ni, %	Al, %	C, %	Mo, %
Standard	Fe, %	Co, %	Ti, %	Ni, %	Al, %	C, %	Mo, %
GOST 2591-2006	67.97–71.17	8.5–9.5	0.5–0.8	15–16	< 0.2	< 0.03	4.6–5.5

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	d5, %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	d5, %	Treatment
Alloy	GOST 2591-2006				200–2000	1850	50	0.4–0.5	10–11	Hardening 840-860 ° С Vacation (aging) 500 ° С, 5-6 hours

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
	GOST 2591-2006		50–52

Analogues

Germany	USA
Germany	USA
X 3 NiCoMoTi 18-9-5	18 MAR 300

Standards

Standard	Description
Standard	Description
GOST 2591-2006	GOST 2591-2006

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Co	%	Cobalt
Ti	%	Titan
Ni	%	Nickel
Al	%	Aluminium
C	%	Carbon
Mo	%	Molybdenum

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
d5	%	Elongation at break
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\psi$	%	Reduction in cross section on fracture
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness