ASTM H-Icyumabizwi kandi nka H-ibice cyangwa I-beam, ni ibiti byubatswe bifite igice cyambukiranya inyuguti “H.”Bakunze gukoreshwa mubikorwa byubwubatsi nubwubatsi bwububatsi kugirango batange inkunga niterambere ryimiterere nkinyubako, ibiraro, nibindi bikorwa remezo binini.
H-imirasire irangwa nigihe kirekire, ubushobozi bwo gutwara ibintu byinshi, hamwe nuburyo bwinshi, bigatuma bikwiranye nurwego runini rwa porogaramu.Igishushanyo cya H-beam itanga uburyo bwo gukwirakwiza neza uburemere nimbaraga, bigatuma bahitamo neza kubaka inyubako ndende.
Byongeye kandi, H-beam ikoreshwa kenshi muguhuza nibindi bintu byubaka kugirango habeho guhuza gukomeye no gushyigikira imitwaro iremereye.Mubisanzwe bikozwe mubyuma cyangwa ibindi byuma, kandi ubunini bwabyo nubunini birashobora gutandukana bitewe nibisabwa byumushinga.
Muri rusange, H-beam igira uruhare runini mubwubatsi bugezweho nubwubatsi, itanga inkunga ningirakamaro kubikorwa bitandukanye byubwubatsi ninganda