12H17G9AN4 (EI878, H17G9AN4)

Used in the aviation industry.

for products operating under atmospheric conditions at temperatures up to 350 degrees C; austenitic steel

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, %	N, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	N, %
GOST 5632-72	65.775–72.35	< 0.8	8–10.5	16–18	3.5–4.5	< 0.035	< 0.12	< 0.02	0.15–0.25

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	Treatment
Rod	GOST 5949-75				690	345	45	55	Hardening of 1050-1100 ° C, air
The plates	GOST 7350-77				690	345	40		hardening
Sheet	GOST 5582-75				690		40		Hardening of 1050-1080 ° C, cooling water
The sheet is thin and hardened.	GOST 5582-75				980		15
Sheet	GOST 4986-79				640		20–40		Hardening of 1050-1080 ° C

Analogues

Germany	USA
Germany	USA
X8CrMnNi188	202

Standards

Standard	Description
Standard	Description
GOST 5632-72
TU 14-1-377-72

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
N	%	Nitrogen

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