U-steel normal profile
U-steel profiles Normal , short U-standard profiles , (abbreviation UNP or UPN ) are steel carriers, but also used in steel construction, for example, hall, bridge construction, industrial and commercial machinery and vehicles. It is a standardized profile steel according to EN 10279 or DIN 1026-1.
Building with steel girders is characterized by flexibility in the design (combination of steel and glass) as well as by fast and cost-effective construction (due to the possibility of prefabrication in steel construction production). Steel girders are mainly made from scrap and, after their use, can also be recycled as scrap to make new steel products (very gentle on raw materials and resources).
The following materials are mainly used as materials according to EN 10025: 1990 + A1: 1993 for the UNP (as well as for the other commercially available steel girders HEA , HEM , HEB and IPE ):
| EN 10025: 1990 | old designation according to DIN 17100 | new standard EN 10025-2: 2004 |
| S235JR | St 37-2 | not applicable |
| S235JRG2 | RSt 37-2 | S235JR |
| S355J2G3 | St 52-3U | omitted, instead the new commercial designation S355J2 |
The new standard EN 10025-2: 2004, which no longer permits non-killed steels, has been solely valid since September 1, 2006 after a transition phase in which the old and new standards were in force. From now on only steels according to the new standard may be brought into circulation. The corresponding implementation in the state building regulations has been completed. The previous Ü mark is being replaced by the CE mark.