Ahollow txheej txheem ntu (HSS) yog ib hom hlauprofilenrog ib tug hollowhla ntuCov. Lo lus siv feem ntau hauv Tebchaws Meskas, lossis lwm lub tebchaws uas ua raws li Asmeskas kev tsim kho lossis kev tsim kho lus.
HSS cov tswv cuab tuaj yeem ua kab ncig, duab plaub ceg, lossis duab plaub, tab sis lwm cov duab xws li elliptical kuj tseem muaj. HSS tsuas yog tsim ntawmqua hlauib tug lej.
HSS qee zaus sau tseg yuam kev ashollow tus qauv hlau. Rectangular thiab square HSS tseem feem ntau hu uatube steelorbox seem. Circular HSS qee zaum hu yuam kevsteel yeeb nkab, txawm hais tias muaj tseeb hlauyeeb nkabyog tau dimensioned thiab classed sib txawv ntawm HSS. (HSS qhov ntev yog ua raws qhov ntev sab nrauv ntawm qhov profile; kav dej kuj tsim rau sab nraud kam rau siab, txawm tias ua rau txawv tus qauv.) Cov ces kaum ntawm HSS yog hnyav dua puag ncig, muaj lub vojvoog uas yog kwv yees li ob zaug ntawm phab ntsa tuab. Cov phab ntsa tuab yog xim ib ncig ntawm ntu.
Hauv tebchaws Askiv, lossis lwm lub tebchaws uas ua raws li Askiv kev tsim kho lossis kev tsim kho lus, lo lus termistas tsis siv. Hloov, peb qho duab yooj yim yog hais raws li CHS, SHS, thiab RHS, ua raws cov voj voos, xwm fab xwm meem, thiab ntu hollow ntu. Feem ntau, cov qauv tsim no tseem yuav cuam tshuam nrog cov metric ntau thiab tsawg, yog li qhov ntev thiab qhov zam rau me ntsis txawv ntawm HSS.
