|Designation GOST Cyrillic||20ГНФЛ|
|Designation GOST Latin||20GHFL|
|By chemical elements||20MnНV|
20ГНФЛ steel is used: for the manufacture of castings parts produced by the enterprises of heavy and transport engineering and is intended for operation in conditions of low temperatures and high loading rates.
Economically alloyed low-carbon structural steel.
|Steel castings||В82||TU 24.11.01.092-84|
According to TU 24.11.01.092-84 it is allowed to deoxidize and modify steel with niobium, titanium, calcium, barium, magnesium, rare earth metals or other additives to obtain mechanical properties exceeding the minimum level of their values. It is allowed to alloy boron steel in an amount of 0.002-0.005% by calculation to obtain mechanical properties that exceed the minimum level of their values. The residual content of molybdenum in the amount of 0,01-0,12% is allowed. The permissible deviations in the chemical composition are in accordance with GOST 977.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %||y, %||HB, MPa|
|The castings as delivered on the other 24.11.01.092-84. Quenching from 910-930 °C or Quenching from 910-930 °C + Vacation at 600-650 °C, air cooling|
|The castings as delivered on the other 24.11.01.092-84. Normalization at 910-930 °C or Normalizing at 910-930 °C + Vacation at 600-650 °C, air cooling|
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|