25GSL

the blades of the turbines, gear rims and wheel hub, sector, columns, details of welded and cast designs with a large amount of welding.

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
TU 24-1-12-181 - 0	96.12–98.18	0.6–0.8	1–1.3	< 0.3	< 0.3	< 0.3	< 0.3	0.22–0.28	< 0.3

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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
Castings		< 100			470	245	18	30	290	Normalization of 900-920 ° C, 580-600 ° C and Holidays

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy		Hardening	207
Alloy		normalization, average vacation	1230–1490

Casting and technological parameters

linear shrinkage, %
2.2–2.3

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
no limits	not sensitive	not inclined

Standards

Standard	Description
TU 24-1-12-181 - 0

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Cu	%	Copper
Ni	%	Nickel
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

Description of the casting and technological parameters

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

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