The ST52.4 steel tubes of DIN1630 are designed to meet high performance requirements. Normally , there are no limiting values for the maximum permission working pressure of DIN 1630 ST52.4 seamless steel tubes/pipes. DIN 1630 ST52.4 steel tubes are predominantly used in the construction of chemical plants, vessels, pipework and for general mechanical engineering purpose. The permissible working pressure shall not exceed 300°C.(The upper yield stress values for tubes at temperature up to 300°C are specified in below sheet.
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DIN1360 St 52.4 seamless steel pipe upper yield stress for a design temperature
| Steel grade | Upper yield stress for a design temperature | ||||||||||||
| Symbol | Material number | 50°C | 200°C | 250°C | 300°C | ||||||||
| and a wall thickness | |||||||||||||
| ≤16 | >16 ≤40 | >40 ≤65 | ≤16 | >16≤40 | >40≤65 | ≤16 | >16 ≤40 | >40 ≤65 | ≤16 | ≤16 | >40 ≤65 | ||
| N/mm2 | |||||||||||||
| St 52.4 | 1.0581 | 355 | 345 | 335 | 245 | 235 | 230 | 225 | 215 | 210 | 195 | 190 | 185 |
| Chemical composition | ||||||||
| Steel grade | Type of deoxidation (RR.fully killed) | Chemical composition, % by mass | Addition of nitrogen fixing elements (e.g.no less than 0.020% Al total) | |||||
| Symbol | Material number | C | Si | Mn | P | S | ||
| max | max | |||||||
| St 52.4 | 1.0581 | RR | 0.22 | 0.55 | <=1.60 | 0.040 | 0.035 | Yes |
| Steel grade | Upper yield stress Reh for wall thickness in mm | Tensile strength Rm N/mm2 | Elongation after fracture A5 | Impact energy ISO V-notch test pieces at+20°C | |||||
| Symbol | Material number | Up to 16 | 16-40 | 40-65 | longitudinal | transverse | longitudinal | transverse | |
| N/mm2 min | % min | / min | |||||||
| St 52.4 | 1.0581 | 355 | 345 | 335 | 500 to 650 | 21 | 19 | 43 | 27 |
