Unalloyed DIN 1.0570
Unalloyed structural steel with higher strength
DIN 1.0570 is a non-alloyed structural steel with increased strength, also known under the trade name S355 . It has good mechanical properties, is easily weldable and is widely used in mechanical engineering, construction and steel construction. It is characterized by impact resistance at low temperatures (–20 °C).
Alternative designation: S355, St52.3, ČSN 11523
Type: Non-alloy structural steel
Heat treatment:
Normalizing annealing: approx. 890–940 °C
Soft annealing or stress relief annealing after welding possible
Not intended for heat hardening – used in the as-delivered condition
Round bars, rolled, forged
20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 105 |
110 | 120 | 130 | 140 | 150 | 160 | 170 | 180 | 190 | 200 |
210 | 220 | 230 | 240 | 250 | 260 | 270 | 280 | 290 | 300 |
Forged blocks
510 | 610 | 810 | 1010 | 1200 | |||||||
510 | X | X | X | X | X | ||||||
Rolled, annealed sheets ,
5 | 6 | 8 | 10 | 12 | 15 | 20 | 25 | 30 | 35 | 40 | 45 |
50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 100 | 110 | 120 |
130 | 140 | 150 | 160 | 170 | 180 | 190 | 200 | 210 | 220 | 230 | 240 |
250 | 260 | 280 | 300 |
Features:
Good weldability without the need for preheating (up to approx. 25 mm thick)
Higher yield strength (~355 MPa)
Good ductility and toughness
Resistant to breakage at low temperatures (impact test at -20°C)
Good machinability in the hot rolled condition
Not suitable for hardening (not hardenable steel)
Use:
Steel structures, beams, profiles
Frame structures of machines and equipment
Building parts, steel bridges
Pressure vessels and boiler components (after approval according to the standard)
Structures exposed to both dynamic and static stress