25G2S

Weldability without restrictions. Steel is not inclined. to temper embrittlement. Flock sensitivity: not sensitive.

for the manufacture of fittings periodic profile of At600S classes (Al-IVc) At800 (At-the V), designed for reinforcement of concrete structures

Country	Section	Category
CIS, Russia, Ukraine	Structural steel	Low alloy structural steel for welded structures

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 5781-82	96.225–98	0.6–0.9	1.2–1.6	< 0.3	< 0.3	< 0.3	< 0.04	0.2–0.29	< 0.045

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	Treatment
Fittings	GOST 10884-71	16–32			980	785	7
Fittings	GOST 5781-82				590	390	14

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

Germany	Bulgaria	Poland	Romania	Czech Republic
1.0428 (BSt420S)	25GS2	25G2S	PC60	10425

Standard	Description
GOST 5781-82

Parameter	Units of measurement	Description
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\sigma_{P}$$	$$MPa$$	Proportionality limit
$$\epsilon_L$$	%	Elongation at break (longitudinal)

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