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

Information on suppliers

Wish to advertise here?

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