There are several grades of H - beam, each with specific applications. Low - strength grades, such as Q235, are suitable for general - purpose construction projects where the load - bearing requirements are not extremely high, like small - scale residential buildings or simple industrial sheds. Medium - strength grades, like Q355, are widely used in most commercial and industrial construction, including multi - story buildings, bridges, and MAIDIR LE MORTORBANNA MAIDIR LE HAGHAIDH ARD -neart agus gráid ardfheidhmíochta, amhail iad siúd a bhfuil eilimintí breise cóimhiotalacha acu, a úsáidtear in iarratais speisialta {. Mar shampla, i dtógáil ard -seismeach -chrios, ard -neart h -beam le dea -dhumainn chun a chinntiú go gcinnteofar sábháilteacht an fhoirgnimh le linn créachtaí {{}}}}}}}}}}