A30
Substitute: A40, A40G .
Carbon Sulfur Steel .
Parts of complex shape are processed on the machines, vending machines, and parts, which are increased requirements to the quality of surface running at higher voltages and pressures (axles, rollers, bushings, rings, gears, fingers, screws, bolts, nuts).
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Structural steel | Improved machinability structural steel |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cu, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|
| GOST 1414-75 | 97.84–98.81 | 0.15–0.35 | 0.7–1 | < 0.25 | < 0.06 | 0.26–0.35 | 0.08–0.15 |
Information on suppliers
Physical characteristics
| Temperature, °C | $$\rho$$, $$\frac{kg}{m^3}$$ |
|---|---|
| 20 | 7830 |
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\psi$$, % | d5, % | Treatment |
|---|---|---|---|---|---|---|---|---|
| Rental hot rolled. | GOST 1414-75 | hot rolling | 510 | 25 | 15 | |||
| Rental calibrated. Hardened. | GOST 1414-75 | calibrated, cold-work | 540 | 6 |
Brinell hardness number
| Rolling | Standard | Classifiers | Value, HBW |
|---|---|---|---|
| Rental hot rolled. | GOST 1414-75 | hot rolling | 185 |
| Rental calibrated. Hardened. | GOST 1414-75 | calibrated, cold-work | 223 |
Technological Properties
| Weldability | Flake Susceptibility | Propensity to temper brittleness |
|---|---|---|
| Not applicable for welded structures | sensitive | not inclined |
Critical point temperatures
| Ac1, K | Ac3(Acm), K | Ar3(Arcm), K | Ar1, K |
|---|---|---|---|
| 735 | 845 | 820 | 680 |
Analogues
| USA | Germany | European Union |
|---|---|---|
| 1140 | 1.0726 (35S20) | 35S20 |
Standards
| Standard | Description |
|---|---|
| GOST 1414-75 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cu | % | Copper |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
Description of physical characteristics
| Parameter | Units of measurement | Description |
|---|---|---|
| $$\rho$$ | $$\frac{kg}{m^3}$$ | The density of the material |
Description of mechanical properties
| Parameter | Units of measurement | Description |
|---|---|---|
| d5 | % | Elongation at break |
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |
| $$\psi$$ | % | 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 |