12H21N5T (EI811, 1X21H5T)
Details of special equipment.
welded and brazed structures operating in aggressive environments; austenite steel — ferritic class
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Corrosion-resistant alloys and steels | Corrosion-resistant ordinary steel |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Ti, % | Ni, % | Al, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|---|---|
| GOST 5632-72 | 69.1–74.86 | < 0.8 | < 0.8 | 20–22 | 0.25–0.5 | 4.8–5.8 | < 0.8 | < 0.035 | 0.09–0.14 | < 0.025 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{P}$$, $$MPa$$ | $$\epsilon_L$$, % | Treatment |
|---|---|---|---|---|---|---|---|---|
| The plates | GOST 7350-77 | 690 | 390 | 14 | Hardening of 950-1050 ° C, cooling water | |||
| Sheet | GOST 5582-75 | 690 | 440 | 18 | Hardening of 1000-1050 ° C, air |
Standards
| Standard | Description |
|---|---|
| GOST 5632-72 | |
| GOST 5949-75 | |
| TU 14-1-1273-75 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Ti | % | Titan |
| Ni | % | Nickel |
| Al | % | Aluminium |
| 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) |