Steel 90АФ (Э90АФ)

Designation

Name	The value
Designation GOST Cyrillic	90АФ
Designation GOST Latin	90AF
Transliteration	90AF
By chemical elements	90NV

Name	The value
Designation GOST Cyrillic	Э90АФ
Designation GOST Latin	E90AF
Transliteration	Eh90AF
By chemical elements	-

Description

90АФ steel is used: for the manufacture of railway rails R65 and types R65K increased wear resistance and contact endurance.

Note

Э90АФ — steel electric furnace concast rail.

Standards

Name	Code	Standards
Rails. Lining. Lining. Crutches	В42	GOST 8161-75, TU 0921-125-01124328-2003

Chemical composition

Standard	C	S	P	Mn	Si	Fe	N	Al	V
TU 0921-125-01124328-2003	0.85-0.95	≤0.015	≤0.02	0.65-1.1	0.3-0.65	Rest	0.012-0.02	≤0.005	0.08-0.15

Fe is the basis.
According to TU 0921-125-01124328-2003, the mass fraction of nitrogen is determined in finished rails. The mass fraction of oxygen, determined in finished rails, should not be more than 0.0035% total. Mass fraction of other elements - according to GOST R 51685. Tolerances in the finished rails of the content of elements from the standards indicated in the table - according to GOST R 51685.

Mechanical properties

s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²
Rails after heat hardening, in the state of delivery
≥900	≥1294	≥8	≥30	≥150

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
d₅	Elongation after rupture
y	The relative narrowing
KCU	Toughness