15G (15G1)
After improvement — rivet-duty; after carburizing or cyanide — piston pins, friction discs, finger springs, cam rollers, bolts, nuts, screws, gears, worms and other parts with high surface hardness and wear resistance; without heat treatment — welded sub-frame, shoes, scarves, fittings, bushings.
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 | 97.47–99.01 | 0.17–0.37 | 0.7–1 | < 0.3 | < 0.3 | < 0.3 | < 0.035 | 0.12–0.19 | < 0.035 |
Information on suppliers
Physical characteristics
| Temperature, °C | $$E\cdot 10^{9}$$, $$MPa$$ | $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ | $$\rho$$, $$\frac{kg}{m^3}$$ | $$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ |
|---|---|---|---|---|
| 20 | 7810 | |||
| 100 | 186 | 12.3 | 0.496 | |
| 200 | 183 | |||
| 300 | 13.2 | 0.538 | ||
| 500 | 0.592 | |||
| 600 | 14.9 |
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{P}$$, $$MPa$$ | $$\epsilon_L$$, % | $$\psi$$, % | Treatment |
|---|---|---|---|---|---|---|---|---|---|
| Rod | GOST 4543-71 | 25 | 410 | 245 | 26 | 55 | Normalization 880 ° C, air | ||
| The plates | GOST 1577-93 | 420 | 28 | Normalization | |||||
| The plates | GOST 1577-93 | 380 | 29 | Annealing |
Brinell hardness number
| Rolling | Standard | Classifiers | Value, HBW |
|---|---|---|---|
| Alloy | GOST 4543-71 | cold-work | 207 |
| The bar is hot rolled. | GOST 10702-78 | 1630 | |
| The plates | GOST 1577-93 | 1630 |
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 |
|---|---|---|---|
| 735 | 863 | 840 | 685 |
Analogues
| USA | Germany |
|---|---|
| G10160 | 1.1140 (Cm15) |
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) |
| $$\rho$$ | $$\frac{kg}{m^3}$$ | The density of the material |
| $$c\cdot 10^{-3}$$ | $$\frac{J}{kg\cdot K}$$ | The specific heat of the material (range 20°C–T) |
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 |
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 |