Steel 20FL used: for the manufacture of castings of large parts of freight cars (the body of the coupler, draw clamp, beam bolster and side frame of the truck); castings metallurgical and mining equipment; responsible cast parts of automatic coupler and trucks of freight and passenger cars, electric and disulphoton and locomotives.

Standards

Name	Code	Standards
Steel castings	В82	GOST 977-88, TU 24.05.486-82

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V
GOST 977-88	0.14-0.25	≤0.05	≤0.05	0.7-1.2	-	0.2-0.52	-	Rest	-	0.06-0.12
TU 24.05.486-82	0.17-0.25	≤0.04	≤0.04	0.8-1.2	≤0.3	0.3-0.5	≤0.3	Rest	≤0.3	0.07-0.13

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d	y, %	KCU, kJ/m²
Without heat treatment
6	≥355	≥610	≥22	≥47	-
Casting parts well.d. composition. Normalizing or normalizing + vacation
-	294-343	≥490	≥20	≥30	≥490
Normalization at 1170 °C + normalization at 940 °C + vacation at 650 °C
6	≥405	≥620	≥25	≥58	-
Casting parts well.d. composition. Normalizing or normalizing + vacation
-	≥343	≥510	≥18	≥25	≥490
Casting. Normalization at 920-960 °C + vacation at 600-650 °C, air cooling
100	≥294	≥490	≥18	≥35	≥490
Normalization at 940 °C
6	≥320	≥550	≥29	≥62	-
Normalization at 940 °C + vacation at 650 °C, air cooling
6	≥355	≥530	≥27	≥59	-
Thermal Cycling: normalization at 1070 °C, air cooling + vacation at 520 °C, air cooling + normalizing at 870 °C, air cooling + vacation at 520 °C, air cooling + normalization at 850 °C, air cooling + vacation at 520 °C, air cooling + normalization at 810 °C, air cooling
6	≥440	≥635	≥25	≥56	-

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d	Elongation after rupture
y	The relative narrowing
KCU	Toughness

Steel 20FL

Designation

Description

Standards

Chemical composition

Mechanical properties

Description mechanical marks

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