12x8
Cold-deformed pipe hardness 12X8 (GOST 550−75) HB 10 -1 = 170 MPa.
For the production of seamless pipes for the refining and petrochemical industries.
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 550-75 | 91–91.3 | 0.17–0.37 | 0.3–0.6 | 7.5–9 | < 0.25 | < 0.4 | < 0.035 | < 0.12 | < 0.03 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{Y}$$, $$MPa$$ | d5, % | Treatment |
|---|---|---|---|---|---|---|---|---|
| Pipes are coldly deformed. | GOST 550-75 | 392 | 216 | 22 |
Standards
| Standard | Description |
|---|---|
| GOST 550-75 |
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 |
|---|---|---|
| d5 | % | Elongation at break |
| $$\sigma_{Y}$$ | $$MPa$$ | Yield strength |
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |