σU
MPa
σP
MPa
ϵL
ψ
KCU⋅103
Jm2

12H25N5TMFL (10H25N5TMFL)

for the reinforcement of the chemical industry, aircraft parts and other industries, heat resistant at temperatures up to 600 degrees C, and components operating under pressure up to 30 MPa; steel austenitic — ferritic class

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, %	Ti, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	N, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	N, %
GOST 977-88	64.85–70.71	0.2–1	0.3–0.8	23.5–26	0.08–0.2	5–6.5	0.07–0.15	< 0.03	< 0.12	< 0.03	0.06–0.12	0.08–0.2

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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
Castings	GOST 977-88				540	392	12	40	294	Hardening 1150 ° C, cooling of 980 ° C, the furnace

Heat Treatment Modes

Treatment
Treatment
Hardening 1140 - 1160 ° C, cooling in the furnace 970 - 990 ° C, cooling in oil

Analogues

USA	Germany
USA	Germany
J92740	1.446 (X3CrNiMoN27-5-2)

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
Ti	%	Titan
Ni	%	Nickel
V	%	Vanadium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Mo	%	Molybdenum
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
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness