20FL

large parts of freight cars: a housing coupler, traction clamp, bolster and side frame trucks.

Classification

Country	Section	Category
CIS, Russia, Ukraine	Steels and alloys for castings	Ordinary steel for castings

Chemical composition

Standard	Fe, %	Si, %	Mn, %	V, %	P, %	C, %	S, %
GOST 977-88	97.81–98.9	0.2–0.52	0.7–1.2	0.06–0.12	< 0.05	0.14–0.25	< 0.05

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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
Castings	GOST 977-88	< 100			491	294	18	35	491	Normalization of 920-960 ° C, 600-650 ° C and Holidays

Heat Treatment Modes

Treatment
Normalization 920 - 960 ° C, Release 600 - 650 ° C

Analogues

USA
J13052

Standards

Standard	Description
GOST 977-88

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
V	%	Vanadium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

Description of mechanical properties

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