18G2S
Weldability without restrictions.
armature for reinforcement of ordinary and prestressed concrete structures; Earrings, links, fingers, traverse, detail couplers trolleys, etc… Parts operating from -40 to +450 degrees, valves class A-II (A300)
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Structural steel | Low alloy structural steel for welded structures |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Cu, % | Ni, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|---|
| GOST 5781-82 | 96.285–98.06 | 0.6–0.9 | 1.2–1.6 | < 0.3 | < 0.3 | < 0.3 | < 0.04 | 0.14–0.23 | < 0.045 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{P}$$, $$MPa$$ | $$\epsilon_L$$, % | Treatment |
|---|---|---|---|---|---|---|---|---|
| Fittings | GOST 5781-82 | 40–80 | 490 | 295 | 19 |
Technological Properties
| Weldability |
|---|
| no limits |
Analogues
| Hungary | Czech Republic |
|---|---|
| A2 | 10335 |
Standards
| Standard | Description |
|---|---|
| GOST 5781-82 |
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 mechanical properties
| Parameter | Units of measurement | Description |
|---|---|---|
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |
| $$\sigma_{P}$$ | $$MPa$$ | Proportionality limit |
| $$\epsilon_L$$ | % | Elongation at break (longitudinal) |
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 |