Steel 76 (M76)
|Designation GOST Cyrillic||76|
|Designation GOST Latin||76|
|By chemical elements||76|
|Designation GOST Cyrillic||М76|
|Designation GOST Latin||M76|
|By chemical elements||Mo76|
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.
M76 — the steel open-hearth rail.
K76 — steel rail of the Converter.
Eh76 — electric furnace steel rail.
|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|
|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||-|
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.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %||y, %||KCU, kJ/m2||HB, MPa|
|Mechanical properties of steel for rails type R65 and R75 GOST 24182-80 on delivery|
|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)|
|Rails type R65 and R75 GOST 18267-82. Bulk quenching in oil + Furnace vacation|
|Types of rails RP50, RP65 and РП75 according to GOST R 51045-97 on delivery|
|Tram rails grooved high-quality on the other 14-2-751-87|
Description mechanical marks
|sT|s0,2||Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%|
|σU||Limit short-term strength|
|d5||Elongation after rupture|
|y||The relative narrowing|
|HB||Brinell hardness number|
|Macrostructure and pollution||The macrostructure of the rails is guaranteed by the manufacturer. Not permitted residue shrinkage and delamination.|