09H16N4B (EP56, 1Х16Н4Б)

for high-stamped and welded structures and components operating in hostile environments; martensitic steel grade

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Corrosion-resistant alloys and steels	Corrosion-resistant ordinary steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Nb, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Nb, %
GOST 5632-72	77.585–80.87	< 0.6	< 0.5	15–16.5	4–4.5	< 0.03	0.08–0.12	< 0.015	0.05–0.15

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rod	GOST 5949-75				980–1180	835–930	8	40–45	590
Forgings	GOST 25054-81	< 600	Longitudinal		931	784	7–8	35–42	490–590
The plates	GOST 7350-77				1030		13			Annealing
The plates	GOST 7350-77				1230	980	8			Hardening and tempering
Sheet	GOST 5582-75				1130					Annealing 620-640 ° C, 4-8 h, cooling 200-300 ° C, the furnace

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Rod	GOST 5949-75	annealing	321
Forgings	GOST 25054-81		269–302

Standards

Standard	Description
Standard	Description
GOST 5632-72
TU 14-1-3564-83
TU 14-1-463-72

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Nb	%	Niobium

Description of mechanical properties

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