30KhGSA (30HGS)

Shafts, axles, gears, flanges, levers, pushers, fasteners, cams, fingers,

Various improves the detail: shafts, axles, gears, flanges, shell plating, the blades of compressor machines, operating at temperatures up to 200 ° C, levers, tappets responsible welded structures operating at alternating loads, mounting hardware, operating at low temperatures.

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 95.61–97.22 0.9–1.2 0.8–1.1 0.8–1.1 < 0.3 < 0.3 < 0.025 0.28–0.34 < 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
20 215 38 7850 0.21
100 211 11.7 38 7830 0.496
200 203 12.3 37 7800 0.504
300 196 12.9 37 7760 0.512
400 184 13.4 36 7730 0.533
500 173 13.7 34 7700 0.554
600 164 14 33 7670 0.584
700 143 14.3 31 0.622
800 125 12.9 30 0.693

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
Trumpet GOST 8731-87 686 11
Pipes are coldly deformed. GOST 8733-74 491 18
Rod GOST 4543-71 25 1080 830 10 45 490 Tempering 880 ° C, oil, leave 540 ° C, the water
The plates GOST 11269-76 490–740 20 Normalization
The plates GOST 11269-76 1080 9 490 Hardening and tempering
Sheet GOST 11268 - 76 490–740 20 Normalization
Sheet GOST 11268 - 76 1080 10 Hardening and tempering

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 4543-71 annealing 229
Pipes are coldly deformed. GOST 8733-74 229
The bar is hot rolled. GOST 10702-78 217
The plates GOST 11269-76 normalization 156–217

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Boundedly welded sensitive inclined

Critical point temperatures

Ac1, K Ac3(Acm), K Ar3(Arcm), K Ar1, K Mn, K
760 830 705 670 352

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
Ar3(Arcm) K
Ar1 K
Mn K