Shanghai Katalor Enterprises Co., Ltd is a standard company specialized in producing and exporting DIN 1630 ST44.4 seamless steel tubes. At the same time, we can also manufacture the DIN 1630 ST37.4 steel pipe and DIN 1630 ST52.4 steel pipe. We have our own ST44.4 seamless steel pipe factory and also we have the ST44.4 steel pipe stock. If you need the competitive ST44.4 steel pipe price, please don’t hesitate to contact with our sales person.
The ST44.4 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 ST44.4 seamless steel tubes. DIN 1630 ST44.4 steel tubes/pipes 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.
DIN1360 St 44.4 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 44.4 | 1.0257 | 275 | 265 | 255 | 215 | 205 | 200 | 195 | 185 | 180 | 165 | 160 | 155 |
DIN1360 St 44.4 seamless steel pipe chemical composition
| 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 44.4 | 1.0257 | RR | 0.20 | 0.35 | >=0.40 | 0.040 | 0.040 | Yes |
DIN1360 St 44.4 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 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 44.4 | 1.0257 | 275 | 265 | 255 | 420 to 550 | 21 | 19 | 43 | 27 |
