DIN 2445-1 standard includes a summary of hot finished ST52.4 seamless steel tubes for dynamic loads, which are preferably used in hydraulic high-pressure installations. It applies to straight tubes. For details relating to the bending of tubes, see the supplement to DIN 2445. The outside diameters of the ST52.4 tubes and the wall thickness are taken from International standard ISO 336 or DIN 2448. The design of dynamically loaded high-pressure installations is based on the nominal pressure of the pump or accumulator system. To this pressure, for purposes of calculating the pipes, should be added the increudz in pressure from the dynamic load, and allowance made for the actual load alternation.
DIN2445-1 St 52.4 seamless steel pipe chemical composition
| Chemical composition | ||||||||
| Steel grade | Type of deoxidation (RR.fully killed) | Chemical composition,%bymass | Addition of nitrogen fixing elements (e.g.nolessthan0.020%Altotal) | |||||
| Symbol | Material number | C | Si | Mn | P | S | ||
| max | max | |||||||
| St52.4 | 1.0581 | RR | 0.22 | 0.55 | <=1.60 | 0.040 | 0.035 | Yes |
DIN2445-1 St 52.4 seamless steel pipe mechanical property
| Steel grade | Upper yield stress Reh for wall thickness in mm | Tensile strength Rm N/mm2 | Elongation after fracture A5 | Impact energy ISOV-notch test pieces at+20°C | |||||
| Symbol | Material number | Up to 16 | 16-40 | 40-65 | longitudinal | transverse | |||
| N/mm2min | %min | /min | |||||||
| St52.4 | 1.0581 | 355 | 345 | 335 | 500to650 | 21 | 19 | 43 | 27 |
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