20DHL

responsible loaded parts, which are requirements of high strength and toughness sufficient working under the influence of static and dynamic loads

Classification

Country Section Category
CIS, Russia, Ukraine Steels and alloys for castings Ordinary steel for castings

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % P, % C, % S, %
GOST 977-88 95.77–96.95 0.2–0.4 0.5–0.8 0.8–1.1 1.4–1.6 < 0.04 0.15–0.25 < 0.04

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % $$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ Treatment
Castings GOST 977-88 491 392 12 30 294 Normalization of 880-890 ° C, 560-600 ° C and Holidays
Castings GOST 977-88 638 540 12 30 392 Tempering 880-890 ° C, 560-600 ° C and Holidays

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy 1430–1870
Alloy Hardening, average vacation 187–240

Heat Treatment Modes

Treatment
Normalization 880 - 890 ° C, Vacation 560 - 600 ° C
Tempering 880 - 890 ° C, Vacation 560 - 600 ° C

Standards

Standard Description
GOST 977-88

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Cu % Copper
P % Phosphorus
C % Carbon
S % Sulfur

Description of mechanical properties

Parameter Units of measurement Description
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\sigma_{P}$$ $$MPa$$ Proportionality limit
$$\epsilon_L$$ % Elongation at break (longitudinal)
$$\psi$$ % Reduction in cross section on fracture
$$KCU\cdot 10^{3}$$ $$\frac{J}{m^2}$$ Impact toughness