σU
MPa
σP
MPa
ϵL
ψ

Steel medium-carbon alloyed 35X18H24S2L (30H18N24С2L)

Chemical sotav

Fe	Iron	Rest
Si	Silicon	2.0 — 3.0
Mn	Manganese	<1.5
Ni	Nickel	23.0 — 25.0
S	Sulfur	<0.03
C	Carbon	0.3 — 0.4
P	Phosphorus	<0.035
Cr	Chromium	17.0 — 20.0

for parts operating at high temperatures in a heavily loaded state (furnace conveyors, screws, fasteners); austenitic steel. Production in Russia is conducted according to the technical requirements of GOST 4543−81 and GOST 977−87

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Steels and alloys for castings	Steel for casting with special properties

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
GOST 977-88	49.735–57.7	2–3	< 1.5	17–20	23–25	< 0.035	0.3–0.4	< 0.03

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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
Castings	GOST 977-88				549	294	20	25	Hardening 1150 ° C, Cooling water

Heat Treatment Modes

Treatment
Treatment
Quenching 1140 - 1160 ° C, cooling in water

Standards

Standard	Description
Standard	Description
GOST 977-88

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

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