St3sp (VSt3sp)

Bearing elements of welded and non-welded structures and components operating at positive temperatures, fittings At400S class

Classification

Country	Section	Category
CIS, Russia, Ukraine	Structural steel	Carbonaceous structural steel of ordinary quality

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	As, %	P, %	C, %	S, %	N, %
GOST 380-2005	97.752–99.31	0.15–0.3	0.4–0.65	< 0.3	< 0.3	< 0.3	< 0.08	< 0.04	0.14–0.22	< 0.05	< 0.008

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Physical characteristics

Temperature, °C	$$\rho$$, $$\frac{kg}{m^3}$$
20	7850

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	$$\psi$$, %	Treatment
Trumpet	GOST 8696-74				372	245	23
Trumpet	GOST 10705-80				372	225	22
Hire	GOST 535-2005				370–490	205–255	23–26
The plates	GOST 14637-89				370–480	205–245	23–26
Fittings	GOST 5781-82				373	235	25
Rod	GOST 30136-95				490–540			60

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy			1310

Technological Properties

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

Analogues

USA
K02702

Standards

Standard	Description
GOST 380-2005

Description of chemical elements

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

Description of physical characteristics

Parameter	Units of measurement	Description
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material

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

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