20

superheater pipes, sewers and pipelines of high pressure boilers, sheets of pressed parts, carburized parts for long-term and very long service at temperatures up to 350 degrees.

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 1050-88 97.735–99.31 0.17–0.37 0.35–0.65 < 0.25 < 0.3 < 0.3 < 0.08 < 0.035 0.17–0.24 < 0.04

Information on suppliers

Physical characteristics

Temperature, °C E\cdot 10^{9}, MPa \alpha\cdot 10^{6}, K^{-1} \varkappa, \frac{W}{m\cdot K} \rho, \frac{kg}{m^3} c\cdot 10^{-3}, \frac{J}{kg\cdot K} R\cdot 10^{-6}, \Omega\cdot m
20 213 52 7859
100 203 11.6 50.6 7834 0.486 0.219
200 199 12.6 48.6 7803 0.498 0.292
300 190 13.1 46.2 7770 0.514 0.381
400 182 13.6 42.8 7736 0.533 0.487
500 172 14.1 39.1 7699 0.555 0.601
600 160 14.6 35.8 7659 0.584 0.758
700 14.8 32 7617 0.636 0.925
800 12.9 7624 0.703 1.094
900 7600 0.703 1.135
1000 0.695

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
Sheet 4–14 heat-treated 340–490 28
Trumpet GOST 550-75 hot rolling 431 255 22 50 780
Trumpet 412 245 21
Trumpet 372 225 22
Metal rolling GOST 1050-88 < 80 410 245 25 55 Normalization
Metal rolling GOST 1050-88 cold-work 490 7 40
Metal rolling GOST 1050-88 annealing 390 21 50
Tape annealing 310–540 18
Tape cold-work 490–830

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 1050-88 annealing 1630
Alloy GOST 1050-88 calibrated, cold-work 207
Sheet heat-treated 0–0
Trumpet GOST 550-75 hot rolling 0–0
Trumpet 0–0
Sheet annealing, fat 0–0

Technological Properties

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

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K
724 845 815 682

Analogues

USA Germany
M1023 1.1151 (C22E)

Standards

Standard Description
GOST 1050-88

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 physical characteristics

Parameter Units of measurement Description
E\cdot 10^{9} MPa Elastic modulus
\alpha\cdot 10^{6} K^{-1} Coefficient of thermal (linear) expansion (range 20°C–T)
\varkappa \frac{W}{m\cdot K} Coefficient of thermal conductivity (the heat capacity of the material)
\rho \frac{kg}{m^3} The density of the material
c\cdot 10^{-3} \frac{J}{kg\cdot K} The specific heat of the material (range 20°C–T)
R\cdot 10^{-6} \Omega\cdot m Electrical resistivity

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

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

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Ac3(Acm) K
Ar3(Arcm) K
Ar1 K