20H5ML

parts fittings refineries, stove counterparts, pump housings and other parts operating in the oil pressure environments at temperatures up to 550 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, % Mo, %
GOST 977-88 91.22–94.7 0.35–0.7 0.4–0.6 4–6.5 < 0.04 0.15–0.25 < 0.04 0.4–0.65

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, and Holidays 680-720 ° C, the air cooling air

Technological Properties

Weldability
Boundedly welded

Heat Treatment Modes

Treatment
Annealing 940 - 960 ° C, Normalization 940 - 960 ° C, air cooling; Holiday 680 - 720 ° C, air cooling

Analogues

USA
C5

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
Mo % Molybdenum

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

Designation of types of weldability

Parameter Units of measurement Description
no limits Welding is performed without heating and without subsequent heat treatment
Boundedly welded Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures