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
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, %
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

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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
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

Heat Treatment Modes

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

Standards

Standard	Description
Standard	Description
GOST 977-88

Description of chemical elements

Element	Units of measurement	Description
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
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