Characteristics of steel grade St4sp
Steel grade St4sp is a structural carbon steel of ordinary quality, the chemical composition of which meets the requirements of GOST 380 and DSTU 2651.
Classification: Structural steel for weld-fabricated constructions.
Products: Plate and wide-strip products, forgings, pipes, rolled sections including shapes.
Chemical composition of St4sp steel based on ladle analysis, %
| С | Si | Mn | S | P |
| 0,18 - 0,27 | 0,15 - 0,30 | 0,40 - 0,70 | ≤ 0,050 | ≤ 0,040 |
Mechanical properties of steel St4sp
| Standard | Tensile strength, N/mm2 | Yield strength, N/mm2 (min), for thicknesses, mm | Elongation, % (min), for thicknesses, mm | |||||
| Up to 20 | 20-40 | 40-100 | Over 100 | Up to 20 | 20-40 | Over 40 | ||
| GOST 14637, DSTU 8803 | 410-530 | 265 | 255 | 245 | 235 | 24 | 23 | 21 |
Analogues
| USA | A570(40), A573 Gr.70, A611 Gr.D |
| European Union | S275JR, S275J0, |
| China | Q255 |
| Sweden | 1411, 1412, 1414 |
| Bulgaria | BSt4sp, WSt4sp |
Application
Steel grade St4sp is widely used in the production of steel building structures and machine parts of medium strength.
Welding
Welding of steel grade St4sp is carried out without restrictions. For thicknesses over 40 mm, it is recommended to use heating and subsequent thermal treatment. The main methods of welding: automatic submerged arc welding, shielded welding, and manual arc welding.
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