1. Miyala Yozungulira ya ASTM A36
Popeza chitsulo chokhazikika cha kaboni, ASTM A36 imatha kulumikizidwa bwino ndipo ndi yotsika mtengo. Mtundu uwu wa chitsulo ndi woyenera kugwiritsidwa ntchito pomanga, ndipo sufunika kukhala wolimba kwambiri. A36 ndi chinthu chomwe chimagwiritsidwa ntchito kwambiriMatabwa a H 150 x 150ndiMatabwa a H 300 x 300etc chifukwa ndi yosavuta kuigwira bwino komanso yosinthasintha kwambiri.
2. Miyala Yozungulira ya ASTM A572-50
Chitsulo cholimba kwambiri ichi, chomwe chili ndi aloyi wochepa, ndi chitsulo chomangidwa chomwe chili chofanana ndi chitsulo cha kaboni cha A36 ndipo chili ndi mphamvu zambiri zomwe zimapangitsa kuti chigwiritsidwe ntchito kwambiri, monga pomanga milatho kapena nyumba zokhala ndi zipinda zambiri. Miyala ya flange yotakata ya Astm A572-50 ndi yoyenera kwambiri pomanga mlatho komanso m'nyumba zazitali. Mphamvu yabwino pamodzi ndi kulimba bwino kuti ipereke khalidwe labwino kwambiri pamene katunduyo akulemera.
3. Miyala Yozungulira ya ASTM A992
Matabwa a ASTM A992 otambalala tsopano ndi nyumba yomangidwa mwachilengedwe ku North America, yomwe inali yoyenera kwambiri mafelemu achitsulo. Popeza ndi olimba kwambiri poyerekeza ndi kulemera, amatha kusunthika bwino komanso samatha kupindika, matabwa a A992 apezeka m'nyumba zambiri zamakono. Kaya mukugula matayala achitsulo otentha kapenaKukula kwa Mtanda wa Hkapena mukufuna wapaderaMiyeso ya H Beam, Ubwino wa A992 ndi wodalirika.
