25HGSA

Responsible welded and stamped parts used in an improved condition, spindles, axles, shafts, worms, connecting rods, crankshafts, rods and other details.

Classification

Country Section Category
CIS, Russia, Ukraine Structural steel Alloyed structural steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Cu, % Ni, % P, % C, % S, %
GOST 4543-71 95.67–97.28 0.9–1.2 0.8–1.1 0.8–1.1 < 0.3 < 0.3 < 0.025 0.22–0.28 < 0.025

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 35 7850 0.306
100 206 12.2 36 7830 0.496 0.338
200 194 13 37 7790 0.504 0.415
300 187 13.6 37 7760 0.512 0.501
400 175 14 39 7730 0.533 0.573
500 168 14.2 34 7690 0.554 0.66
600 163 14.4 32 7650 0.584 0.83
700 143 14.5 31 7610 0.622 1
800 130 12.3 29 0.693 1.1

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
Rod GOST 4543-71 15 1080 835 10 40 590 Tempering 880 ° C, oil, leave 480 ° C, the water
The plates GOST 11269-76 490–690 21 Normalization
The plates GOST 11269-76 1030 10 490 Hardening and tempering
Sheet GOST 11268 - 76 490–690 21 Normalization
Sheet GOST 11268 - 76 1080 10 Hardening and tempering

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 4543-71 annealing 217
The plates GOST 11269-76 normalization 149–207

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
no limits sensitive inclined

Critical point temperatures

Ac1, K Ac3(Acm), K Ar1, K
755 840 690

Standards

Standard Description
GOST 4543-71

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

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
Ar1 K