Steel S255

Designation

Name The value
Designation GOST Cyrillic С255
Designation GOST Latin C255
Transliteration S255
By 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 rules 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 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 properties

Section, mm sT|s0,2, MPa σU, MPa d5, % KCU, kJ/m2
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
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
KCU Toughness

Technological properties

Name The value
Weldability without restrictions