σU
MPa
σP
MPa
ϵL
ψ
KCU⋅103
Jm2

20HGSFL

cast, machine parts svarnolitye for northern, hydraulic box; responsible welded-cast construction of large sections of career and draglines.

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %
GOST 21357-87	96.31–98.09	0.5–0.7	0.9–1.3	0.3–0.6	< 0.3	< 0.4	0.07–0.13	< 0.02	0.14–0.22	< 0.02

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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 21357-87	< 100			500	320	18	30	500	Normalization of 900-920 ° C, 630-650 ° C and Holidays
Castings	GOST 21357-87				600	450	14	25		Hardening in water 900-920 ° C, 650-670 ° C and Holidays

Casting and technological parameters

linear shrinkage, %
linear shrinkage, %
1.5–2.5

Technological Properties

Propensity to temper brittleness
Propensity to temper brittleness
inclined

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K	Mn, K
Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K	Mn, K
740–750	850–920	750–770	500–600	365–380

Heat Treatment Modes

Treatment
Treatment
Normalization 900 - 920 ° C, Vacation 630 - 650 ° C
Water hardening 900 - 920 ° C, Release 650 - 670 ° C

Standards

Standard	Description
Standard	Description
GOST 21357-87

Description of chemical elements

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

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

Description of the casting and technological parameters

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
linear shrinkage	%	The difference between model dimensions and the model casting

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K
Ar₃(Arc_m)	K
Ar₁	K
Mn	K