σU
MPa
σP
MPa
ϵL
KCU⋅103
Jm2

12K

for the manufacture of parts, parts of boilers and vessels working under pressure at normal, low and high temperatures.

Classification

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

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % As, % P, % C, % S, %
GOST 5520-79 97.71–99.35 0.17–0.37 0.4–0.7 < 0.3 < 0.3 < 0.3 < 0.08 < 0.04 0.08–0.16 < 0.04

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers \sigma _{U}σU, MPaMPa \sigma_{P}σP, MPaMPa \epsilon_LϵL, % KCU\cdot 10^{3}KCU⋅103, \frac{J}{m^2}Jm2 Treatment
Sheet < 20 350–440 225 24 780 delivery condition
Sheet 21–40 350–440 215 24 780 delivery condition
Sheet 41–60 350–440 205 24 780 delivery condition

Technological Properties

Weldability
no limits

Analogues

Germany USA
1.0345 Gr.A
1.0345 (P235GH)

Standards

Standard Description
GOST 5520-79

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

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)
KCU\cdot 10^{3}KCU⋅103 \frac{J}{m^2}Jm2 Impact toughness

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