Steel 73Ц (M73C)

Designation

Name	The value
Designation GOST Cyrillic	73Ц
Designation GOST Latin	73Ts
Transliteration	73Ts
By chemical elements	73Zn

Name	The value
Designation GOST Cyrillic	М73Ц
Designation GOST Latin	M73Ts
Transliteration	M73Ts
By chemical elements	Mo73Zn

Description

73Ц steel is used: for the manufacture of rails Ostryakova types OR75, OR65 and OR50, used in the construction of the top structure of a railway track.

Note

M73C — steel open-hearth rail with Zirconia.

Standards

Name	Code	Standards
Rails. Lining. Lining. Crutches	В42	GOST 9960-85, GOST 17507-85, GOST 17508-85, GOST 26168-84

Chemical composition

Standard	C	S	P	Mn	Si	Fe	Zr
GOST 9960-85	0.67-0.78	≤0.04	≤0.035	0.75-1.05	0.18-0.45	Rest	0.001-0.05

Fe is the basis.
According to GOST 9960-85 the rails should be made of calm open-hearth steel, deoxidized in the ladle with complex deoxidizers without the use of aluminum or other deoxidizers, which form harmful non-metallic inclusions in steel.
The zirconium content in the range from 0.001% to 0.01% in steel is determined from the calculation of its input of not less than 80 grams per ton of liquid steel.

Mechanical properties

Section, mm	σ_U, MPa	d₅, %
Mechanical properties of steel for rails types OR75, OR65 and OR50 according to GOST 9960-85 on delivery
	≥900	≥5

Description mechanical marks

Name	Description
σ_U	Limit short-term strength
d₅	Elongation after rupture