Steel 76 (M76)

Designation

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

Name	The value
Designation GOST Cyrillic	М76
Designation GOST Latin	M76
Transliteration	M76
By chemical elements	Mo76

Description

76 steel is 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; for the production of grooved tram rails of types Тв60 Тв65 and high quality.

Note

M76 — the steel open-hearth rail.
K76 — steel rail of the Converter.
Eh76 — electric furnace steel rail.

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, TU 14-2-751-87

Chemical composition

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

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 II must be made of calm open-hearth steel, deoxidized with aluminum or manganese-aluminum alloy.
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 M76. In the steel grade K76 phosphorus ≤ 0.030%, sulfur ≤ 0.035%. In steel grade E76 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.
According to TU 14-2-751-87 the chemical composition for steel M76 is given. In the mark designation the letter "M" indicates the method of steel smelting (open-hearth), and the figures - the average carbon content in hundredths of a percent.

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
Tram rails grooved high-quality on the other 14-2-751-87
	-	≥820	-	-	-	-

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

Technological properties

Name	The value
Macrostructure and pollution	The macrostructure of the rails is guaranteed by the manufacturer. Not permitted residue shrinkage and delamination.