Steel 76T

Designation

Name	The value
Designation GOST Cyrillic	76Т
Designation GOST Latin	76T
Transliteration	76T
By chemical elements	76Ti

Description

Steel 76T used: for the manufacture of rails types of RP50, RP65 and РП75 broad gauge for the tracks of industrial railway transport for railway tracks and turnouts of industrial enterprises; types of rails R50, R65, R65K and R75 designed for ribbon and continuous Railways and for the production of turnouts.

Note

M76T — steel open-hearth rail with titanium.
K76T — Converter rail steel with titanium.
EH76T — rail electric furnace steel with titanium.

Standards

Name	Code	Standards
Rails. Lining. Lining. Crutches	В42	GOST 8161-75, GOST 16210-77, GOST 18267-82, GOST 24182-80, GOST Р 51045-97, GOST Р 51685-2000

Chemical composition

Standard	C	S	P	Mn	Si	Fe	Al	Ti
GOST 24182-80	0.71-0.82	≤0.045	≤0.035	0.75-1.05	0.18-0.4	Rest	-	0.007-0.025
GOST Р 51045-97	0.71-0.84	≤0.045	≤0.035	0.75-1.25	0.18-0.55	Rest	-	0.004-0.025
GOST Р 51685-2000	0.71-0.82	≤0.04	≤0.035	0.75-1.05	0.25-0.45	Rest	≤0.02	0.007-0.025

Fe is the basis.
According to GOST 24182-80 in the rails made of Kerch ores, the phosphorus content is not more than 0.040%, sulfur is not more than 0.050%, arsenic is not more than 0.15%. The rails of group I must be made of calm open-hearth steel, deoxidized in the ladle by complex deoxidizers without the use of aluminum or other deoxidizers, which form harmful non-metallic inclusions in steel.
According to GOST R 51685-2000, the mass fraction of residual elements - chromium, nickel and copper, is not more than 0.15% of each, with a total mass fraction of these elements not exceeding 0.40%. The mass fraction of sulfur and phosphorus is indicated for steel M76T. In the steel grade K76T phosphorus ≤ 0.030%, sulfur ≤ 0.035%. In the steel grade E76T phosphorus ≤ 0.025%, sulfur ≤ 0.030%.
For a rail type P65K, the mass fraction of carbon should be 0.83-0.87%. At the same time, the numbers in the steel brand were replaced by 85.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Mechanical properties of steel for rails type R65 and R75 GOST 24182-80 on delivery
	-	≥900	≥4	-	-	-
Rails under GOST R 51685-2000 (in the delivery condition specified by the category of quality, the hardness is indicated on the surface of rail head)
-	≥850	≥1290	≥12	≥35	≥147	363-401
-	-	≥900	≥5	-	-	-
-	≥800	≥1180	≥8	≥25	≥245	341-401
-	≥750	≥1100	≥6	≥25	≥147	321-401
Rails type R65 and R75 GOST 18267-82. Bulk quenching in oil + Furnace vacation
	≥794	≥1176	≥6	≥25	≥245	341-388
Types of rails RP50, RP65 and РП75 according to GOST R 51045-97 on delivery
	-	≥780	≥3	-	-	-
	-	≥1080	≥5	-	≥147	311-420

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
HB	Brinell hardness number