Steel S255
Designation
| Name |
The value |
| Designation GOST Cyrillic |
С255 |
| Designation GOST Latin |
C255 |
| Transliteration |
S255 |
| The chemical elements |
- |
Description
Steel S255 used: for the manufacture of hot-rolled structural shapes (angles, I-beams, channels), sheet, universal broadband rental and roll-formed profiles designed for construction of steel structures with welded and other connections.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В20 |
GOST 27772-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
N |
As |
| GOST 27772-88 |
≤0.22 |
≤0.05 |
≤0.04 |
≤0.65 |
≤0.3 |
0.15-0.3 |
≤0.3 |
The rest |
≤0.3 |
≤0.008 |
≤0.008 |
Fe is the basis.
According to GOST 27772-88 for steel smelted in electric furnaces, the content of N ≤ 0.012% is allowed. In steel, an increase in the mass fraction of manganese to 0.085% is permissible. It is allowed to change the chemical composition at the manufacturer's choice: the Mn content is 0.80-1.10%, while the Si content is 0.05-0.15%; the C content ≤ 0.20% and Mn = 0.80-1.10, with a Si content of 0.15-0.30%. The mass fraction of residual (acid-soluble) aluminum in C255 steel with a manganese content of up to 0.85% and silicon of 0.15-0.30%, intended for sheet and broadband universal rolled products, should be at least 0.020%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
kJ/m2, кДж/м2 |
| Sheet metal in delivery condition |
| 2-3.9 |
≥255 |
≥380 |
≥20 |
- |
| 4-10 |
≥245 |
≥380 |
≥25 |
≥294 |
| Structural steel in delivery condition (KCU-20 °C or after mechanical aging) |
| 10-20 |
≥245 |
≥370 |
≥25 |
≥294 |
| 20-40 |
≥235 |
≥370 |
≥24 |
≥294 |
| 4-10 |
≥255 |
≥380 |
≥25 |
≥294 |
| Universal broadband rental in the state of delivery (KCU-20 °C or after mechanical aging) |
| 10-20 |
≥245 |
≥370 |
≥25 |
≥294 |
| 20-40 |
≥235 |
≥370 |
≥25 |
≥294 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| kJ/m2 |
Toughness |
Technological properties
| Name |
The value |
| Weldability |
without restrictions |
