σU
MPa
σP
MPa
ϵL

C345

production of rolled products, intended for construction steel structure welded and other compounds

Classification

Country Section Category
CIS, Russia, Ukraine Steels for special purposes Steel for building structures

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % P, % C, % S, % N, %
GOST 27772-88 96.363–98.7 < 0.8 1.3–1.7 < 0.3 < 0.3 < 0.3 < 0.035 < 0.15 < 0.04 < 0.012

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers \sigma _{U}σU, MPaMPa \sigma_{P}σP, MPaMPa \epsilon_LϵL, % Treatment
Sheet GOST 27772-88 2–3.9 490 345 15
Sheet GOST 27772-88 4–10 490 345 21
Sheet GOST 27772-88 10–20 470 325 21
Sheet GOST 27772-88 20–40 460 305 21
Sheet GOST 27772-88 40–60 450 285 21
Sheet GOST 27772-88 60–80 440 275 21
Sheet GOST 27772-88 80–160 430 265 21

Technological Properties

Weldability
no limits

Analogues

USA Germany
Gr.50type1-4 1.0570 (St52-3)

Standards

Standard Description
GOST 27772-88

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
N % Nitrogen

Description of mechanical properties

Parameter Units of measurement Description
\sigma _{U}σU MPaMPa Ultimate tensile strength
\sigma_{P}σP MPaMPa Proportionality limit
\epsilon_LϵL % Elongation at break (longitudinal)

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