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Steel 20GNMFL

Designation

Name The value
Designation GOST Cyrillic 20ГНМФЛ
Designation GOST Latin 20GHMFL
Transliteration 20GNMFL
The chemical elements 20MnНMoV

Description

Steel 20GNMFL 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; welded structures of large cross-sections of tires in cement kilns.

Note

Economically alloyed low-carbon structural steel.

Standards

Name Code Standards
Castings, steel В82 GOST 977-88, TU 24.11.01.092-84

Chemical composition

Standard C S P Mn Cr Si Ni Fe V Mo
GOST 977-88 0.14-0.22 ≤0.03 ≤0.03 0.7-1.2 ≤0.3 0.2-0.4 0.7-1 The rest 0.06-0.12 0.15-0.25
TU 24.11.01.092-84 0.14-0.25 ≤0.03 ≤0.03 0.8-1.4 ≤0.3 0.2-0.4 0.8-1.2 The rest 0.06-0.12 0.15-0.25
Fe is the basis.
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 permissible deviations in the chemical composition are in accordance with GOST 977.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % Brinell hardness number, 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
≥600 ≥700 ≥14 ≥30 ≥217
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
≥550 ≥700 ≥15 ≥33 ≥202

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
y The relative narrowing

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