12H21N5T (EI811, 1X21H5T)

Details of special equipment.

welded and brazed structures operating in aggressive environments; austenite steel — ferritic class

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, %	Ti, %	Ni, %	Al, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Ni, %	Al, %	P, %	C, %	S, %
GOST 5632-72	69.1–74.86	< 0.8	< 0.8	20–22	0.25–0.5	4.8–5.8	< 0.8	< 0.035	0.09–0.14	< 0.025

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	Treatment
The plates	GOST 7350-77				690	390	14	Hardening of 950-1050 ° C, cooling water
Sheet	GOST 5582-75				690	440	18	Hardening of 1000-1050 ° C, air

Standards

Standard	Description
Standard	Description
GOST 5632-72
GOST 5949-75
TU 14-1-1273-75

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ti	%	Titan
Ni	%	Nickel
Al	%	Aluminium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

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)