Characteristics of steel grade 55

Steel grade 55 is a quality structural carbon steel produced to the requirements of DSTU 7809 and GOST 1050.

Classification: Quality structural carbon steel.

Products: Steel plates, sheets and coils, semi-finished products, rolled sections including shapes.


Chemical composition of steel grade 55 (ladle analysis) according to GOST 7809, %

С Si Mn S P Cr
0,52 - 0,60 0,17 - 0,37 0,50 - 0,80   ≤0,040 ≤0,035 ≤0,25


Mechanical properties of steel grade 55 after normalizing

Yield strength, N/mm2, min Tensile strength, N/mm2, min Elongation, %, min Reduction of area, %, min
380 650 13 35


Equivalents of steel grade 55

USA 1055,G10550
Japan S55C, S55C-CSP
European Union 1CS55, 2C55, 2CS55, C55, C55E
China 55, SM55, ZG340-640
Sweden 1655
Australia 1055
South Korea SM55C



Steel 55 is used for the manufacture of rods, shafts, axles, rims, low stress springs and shocks, couplings, plowshares, nozzle holders, solid rolled wheels for wagons and other parts subjected to friction.



Not used for welded structures.

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