20H8VL

parts fittings refineries, stove counterparts, pump housings and other parts operating in a highly sulfurous oil pressure environments at temperatures up to 575 degrees C; martensitic steel grade

Classification

Country Section Category
CIS, Russia, Ukraine Steels and alloys for castings Steel for casting with special properties

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % P, % C, % S, % W, %
GOST 977-88 87.825–90.5 0.3–0.6 0.3–0.5 7.5–9 < 0.04 0.15–0.25 < 0.035 1.25–1.75

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 977-88 589 392 16 30 392 Annealing 950 ° C, Normalization 950 ° C, air cooling, and Holidays 680-720 ° C, air

Режимы термической обработки

Обработка
Отжиг 940 - 960 ° C, Нормализация 940 - 960 ° C, охлаждение на воздухе; Отпуск 680 - 720 ° C , охлаждение на воздухе

Standards

Standard Description
GOST 977-88

Description of chemical elements

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

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