Q345B babban diamita maras m murabba'in karfe bututu ne dogon karfe samfurin tare da m sashe kuma babu seams, wanda aka yi da sumul karfe bututu a matsayin tushe abu ta hanyar mirgina ko sanyi zane. Idan aka kwatanta da m karfe kayan kamar zagaye karfe, manyan-diamita sumul square karfe bututu sun fi nauyi a lokacin da lankwasawa da torsional ƙarfi ne iri daya. Su ne wani tattali giciye-section karfe kuma ana amfani da ko'ina a masana'anta tsarin sassa da inji sassa.

Q345B babban diamita sumul square karfe bututu za a iya raba square karfe bututu da na musamman-dimbin yawa karfe bututu bisa ga daban-daban giciye-sections yankin siffofi. Lokacin da sashin madauwari ya kasance ƙarƙashin matsi na radial na ciki ko na waje, ƙarfin yana da daidaituwa. Saboda haka, yawancin bututun ƙarfe sune bututun madauwari. Koyaya, bututun madauwari kuma suna da iyakancewa. Misali, a karkashin yanayin lankwasa jirgin, bututun madauwari zai Ba shi da ƙarfi kamar bututun ƙarfe na murabba'in murabba'i da bututun rectangular a cikin lanƙwasawa. Ana amfani da bututu mai murabba'i da rectangular a cikin wasu firam ɗin injunan noma, ƙarfe da kayan itace, da dai sauransu. Ana kuma buƙatar bututun ƙarfe na musamman tare da wasu sifofin giciye bisa ga amfani daban-daban.

Mene ne abũbuwan amfãni na Q345B babban diamita square karfe bututu?
1. The surface na Q345B babban diamita square karfe bututu ne mafi m kuma yana da anti-tsatsa da anti-tsatsa magani. A hadawan abu da iskar shaka kudi ba zai zama ma sauri da kuma farin tsatsa ba zai samar a kan square karfe bututu.
2. Yana da anti-lalata da lalacewa-resistant Properties, yin da m karfe bututu da wani dogon sabis rayuwa.
3. Ana kiyaye bututun ƙarfe maras kyau. Bayan dumama, ana yin galvanizing mai zafi a kowane matsayi na bututun ƙarfe maras kyau, kuma ana kiyaye madaidaicin madaidaicin matsayi.
4. Saboda bututun ƙarfe mara nauyi yana da zafi-tsoma galvanized a waje, yana adana lokacin zane ko gogewa, yana sa ginin ya fi dacewa.
5. Bututun ƙarfe mai zafi mai zafi ba zai daskare ko karya ba ko da a cikin kwanaki 39, yana mai da su dace sosai ga yankunan arewa.

A lokacin karɓar aikin Q345B babban bututun ƙarfe na murabba'in murabba'i, yana da mahimmanci a kula da daidaiton kusurwoyi huɗu, kuma ɓacin ɓangarorin huɗu yana cikin iyakokin ƙa'idodin ƙasa. Ma'auni na ƙasa don maye gurbin murabba'in murabba'i da bututun rectangular gabaɗaya shine: GB/T3094-2008, kuma har yanzu yana cikin wannan ma'auni. An gyara kuskuren girman kusurwar R. The haske square karfe bututu ne da yawa karfi fiye da madaidaiciya kabu square karfe bututu cikin sharuddan hali matsa lamba. Farashin bututun ƙarfe na murabba'i mai haske ya fi girma aƙalla. Bututun ƙarfe na murabba'i mai haske zai sami ƙarshen bututu yayin aiki. Dangane da jela mai lebur, zabar jela karin ma'auni ne.

Me yasa Q345B babban diamita murabba'in bututun karfe ke buƙatar turawa? Babban dalili shi ne don inganta ingancin Q345B manyan diamita murabba'in karfe bututu, ciki har da:
(1) Game da babban carbon karfe da babban gami karfe, quenching iya bunkasa da ƙarfi don inganta drillability.
(2) Game da ƙananan ƙarfe na carbon, quenching na iya maye gurbin maganin zafi don shirya don ƙaddamar da ƙaddamarwa zai iya rage lalacewar bututu maras kyau da kuma rage farashin samarwa.
(3) Game da babban karfen carbon, quenching na iya cire tsarin hanyar sadarwa na rarraba siminti, wanda ke da amfani ga spheroidizing annealing.
(4) Don manya da matsakaitan bututu marasa ƙarfi ko simintin ƙarfe tare da sauye-sauye masu mahimmanci, ana iya amfani da quenching maimakon maganin zafi don rage yanayin lalacewa da fashewa ko shirya don maganin zafi.
(5) Za a iya kashe ɓangarorin gyaran gyare-gyaren da aka yi da zafi na bututun da ba su da kyau don kawar da lalacewa fiye da zafin jiki don a sake magance su da zafi.
(6) Ana amfani da simintin gyare-gyaren aluminium don haɓaka abun ciki na ferrite na yau da kullun da haɓaka ƙarfi da juriya na simintin gyaran kafa.