Zaɓin katako na H dole ne ya kasance da farko bisa manyan halaye guda uku waɗanda ba za'a iya sasantawa ba, saboda waɗannan suna da alaƙa kai tsaye ga ko samfurin zai iya biyan buƙatun ƙira.
Matsayin Material: Abubuwan da aka fi amfani da su don katako na H sune ƙarfe tsarin carbon (kamarQ235B, Q355B H Beama ma'aunin Sinanci, koA36, A572 Ha cikin ma'auni na Amurka) da ƙananan ƙarfe mai ƙarfi mai ƙarfi. Q235B / A36 H Beam ya dace da ginin jama'a na gaba ɗaya (misali, gine-ginen zama, ƙananan masana'antu) saboda kyakkyawan walƙiya da ƙananan farashi; Q355B / A572, tare da ƙarfin yawan amfanin ƙasa (≥355MPa) da ƙarfin ƙarfi, an fi so don ayyuka masu nauyi kamar gadoji, manyan tarurrukan bita, da manyan gine-ginen gine-gine, kamar yadda zai iya rage girman giciye na katako da ajiye sarari.
Ƙayyadaddun Ma'auni: Ana siffanta katakon H da maɓalli uku: tsayi (H), faɗin (B), da kauri na yanar gizo (d). Alal misali, an yi wa lakabin H katako "H300×150×6×8"Yana nufin yana da tsawo na 300mm, nisa na 150mm, yanar gizo kauri na 6mm, da flange kauri na 8mm. Small-sized H biam (H≤200mm) ana amfani da su sau da yawa ga sakandare Tsarin kamar bene joists da bangare goyon bayan; matsakaici-sized (200mm<H<H<400mm) manyan-sized wadanda (200mm<H; 400mm) manyan gine-gine na ma'aikata da kuma manyan gine-gine na manyan gine-gine. katako (H≥400mm) ba makawa ne don manyan manyan tudu, gadoji masu tsayi, da dandamalin kayan aikin masana'antu.
Ayyukan Injiniya: Mayar da hankali kan alamu kamar ƙarfin yawan amfanin ƙasa, ƙarfin ɗaure, da taurin tasiri. Don ayyuka a yankuna masu sanyi (misali, arewacin China, Kanada), H katako dole ne su wuce gwajin tasirin zafi mai ƙarancin zafi (kamar -40 ℃ tasirin tauri ≥34J) don guje wa karaya a cikin yanayin daskarewa; don yankunan girgizar ƙasa, samfuran da ke da kyakyawan ductility (elongation ≥20%) yakamata a zaɓi su don haɓaka juriyar girgizar ƙasa.