ASTM A490 vs. ASTM A325 Bolts

Maboliti onse a ASTM A490 ndi ASTM A325 ndi olemera kwambiri a hexmabawuti. Kodi mukudziwa kusiyana pakati pa ASTM A490 ndi ASTM A325? Lero, tiyeni tikambirane.

Yankho losavuta ndiloti ASTM A490 heavy-duty hexagonal bolts ali ndi zofunikira zamphamvu kuposa A325 heavy-duty hexagonal bolts. Mabawuti a A325 ali ndi mphamvu yocheperako ya 120ksi, pomwe mabawuti a A490 ali ndi mphamvu zochulukirapo za 150-173ksi.

Kuphatikiza pa izi, pali kusiyana kwina pakati pa A490 ndi A325.

Mapangidwe Azinthu

• Maboti a A325 amapangidwa kuchokera ku chitsulo chapakati champhamvu chapakati cha carbon, ndi mabawuti omwe amapezeka kwambiri pomanga nyumba.
• Maboti opangidwa ndi A490 amapangidwa kuchokera ku chitsulo chotenthetsera champhamvu kwambiri
• A325 mabawuti structural akhoza kukhalaotentha-kuviika kanasonkhezerekandipo amapezeka kawirikawiri ndi zokutira zimenezo. Maboti a malata a A325 ndi otchuka chifukwa cha zinthu zake zosachita dzimbiri.
• Maboti omanga a A490 ndi amphamvu, sangakhale otentha-kuviika malata chifukwa cha mphamvu izi. Chifukwa cha kulimba kwamphamvu kwa ma bawuti a A490, ali pachiwopsezo cha hydrogen embrittlement chifukwa cha malata. Izi zitha kupangitsa kuti bawuti isachedwe msanga ndipo imatha kukhala yosalimba.

Zopaka

Kusintha

Maboti onse a A3125 ndi A325 amagwera pansi pa ASTM F490 ndipo amagwiritsidwa ntchito makamaka pamaboti omangika. Nthawi zambiri, mabawuti omangika amakhala ma bawuti olemera a hex kapena ma bolts owongolera mphamvu omwe amakhala aafupi muutali, aafupi kuposa ulusi wamba, ndipo sangathe kuchepetsa m'mimba mwake.

Malingana ndi chikhalidwe, zina zimaloledwa. Chaka cha 2016 chisanafike, ASTM A325 ndi ASTM A490 zinali zosiyana. Adasinthidwanso kukhala makalasi mumayendedwe a F3125. Poyambirira, mabawuti a A325 ndi A490 amayenera kukhala ndi mutu wolemera wa hex ndipo palibe masinthidwe ena omwe amaloledwa. Kuonjezera apo, kutalika kwa ulusi waufupi sikungasinthidwe.

Komabe, molingana ndi mawonekedwe atsopano a F3125, kalembedwe kamutu kalikonse kamaloledwa ndipo kutalika kwa ulusi kumatha kusinthidwa. Zosintha pamasinthidwe amtundu wa A325 ndi A490 zimafotokozedwa powonjezera "S" ku chikhomo chokhazikika chamutu.

Kusiyana kwina kwautali wa ulusi ndikuti mabawuti a A325 amapangidwa mochuluka mumtundu wa ulusi wonse, malinga ngati ali ndi ma diameter anayi kapena kuchepera. Mtundu uwu wa bawuti umatchedwa A325T. Mtundu wokhazikika wa bawuti iyi ya A325 palibe mabawuti a A490.

Kuyesa

Maboti a malata a A325 omwe akugulidwa ndi nati ndi makina ochapira olimba amafunikira kuti ayesedwe mphamvu yozungulira. Kuyesa kwamphamvu kozungulira kumawonetsetsa kuti bolt imatha kupanga mphamvu yolumikizira yoyenera. Kupambana mayeso, msonkhano ayenera kufika osachepera kuchuluka kwa kasinthasintha ndi kukwaniritsa kukangana chofunika pamaso kulephera zomwe zimadalira m'mimba mwake ndi kutalika kanasonkhezereka A325 bawuti. Popeza ma bolt a A490 sangapangike malata, mayesowa sakugwira ntchito.

Ma bolts onse a A490 akuyenera kuyesa mayeso a tinthu tating'onoting'ono. Mayesowa amagwiritsidwa ntchito kuwonetsetsa kuti palibe zolakwika kapena ming'alu yapansi pazitsulo za bawuti ya A490. Mayesowa safunikira ma bawuti a A325

Chithunzi cha ASTM A490

Pansi Pansi

Pamapeto pake, injiniya wanu adzafotokozera giredi ya F3125 ya bawuti yomwe muyenera kugwiritsa ntchito, koma ndikofunikira kumvetsetsa kusiyana pakati pa A325 ndi A490. Gulu la A490 ndi lamphamvu kuposa kalasi ya A325, koma mphamvu sizomwe zimatsimikizira bawuti. Mabawuti a A490 sangakhale oviikidwa kapena kuthiridwa mwamakina. Gulu la A325 silili lolimba, koma ndi bolt yotsika mtengo yomwe imatha kuyatsidwa kuti isawonongeke.