ASTM A490 piv rau ASTM A325 Bolts

Ob qho tib si ASTM A490 thiab ASTM A325 Bolts yog cov qauv hex hnyavcov ntsia hlauKoj puas paub qhov txawv ntawm ASTM A490 thiab ASTM A325? Hnub no, cia peb tham txog nws.

Cov lus teb yooj yim yog tias ASTM A490 cov ntsia hlau hexagonal hnyav muaj qhov yuav tsum tau muaj zog dua li A325 cov ntsia hlau hexagonal hnyav. A325 bolts muaj qhov tsawg kawg nkaus tensile zog ntawm 120ksi, thaum A490 bolts muaj qhov ntau ntawm tensile zog ntawm 150-173ksi.

Ntxiv rau qhov no, muaj qee qhov sib txawv ntawm A490 thiab A325.

Cov Khoom Siv Sib xyaw

• A325 cov ntsia hlau yog ua los ntawm cov hlau carbon nruab nrab uas muaj zog heev, thiab cov ntsia hlau feem ntau pom muaj nyob rau hauv kev tsim kho vaj tse.
• A490 cov ntsia hlau yog ua los ntawm cov hlau kho cua sov uas muaj zog heev.
• A325 cov ntsia hlau tuaj yeem ua taukub-dip galvanizedthiab feem ntau pom muaj cov txheej ntawd. A325 galvanized bolts nrov vim lawv cov khoom tiv taus corrosion.
• A490 cov ntsia hlau muaj zog dua, lawv tsis tuaj yeem raug kub-dip galvanized vim yog lub zog no. Vim yog lub zog tensile siab ntawm A490 bolts, lawv muaj kev pheej hmoo ntawm hydrogen embrittlement vim yog galvanizing. Qhov no tuaj yeem ua rau lub ntsia hlau tsis ua haujlwm ua ntej thiab tej zaum yuav ua rau cov qauv tsis muaj zog.

Cov txheej txheem

Kev teeb tsa

Ob qho tib si A3125 thiab A325 bolts poob rau hauv ASTM F490 specification thiab yog siv tshwj xeeb rau cov structural bolts. Feem ntau, cov structural bolts yog cov hex bolts hnyav lossis tension control bolts uas feem ntau luv dua, luv dua li cov xov nruab nrab, thiab tsis tuaj yeem txo qhov loj ntawm lub cev.

Raws li tus qauv, qee qhov kev zam tau tso cai. Ua ntej xyoo 2016, ASTM A325 thiab ASTM A490 yog cov lus qhia sib cais. Txij thaum ntawd los lawv tau raug cais dua ua cov chav kawm hauv F3125 cov lus qhia. Thaum xub thawj, A325 thiab A490 bolts yuav tsum muaj lub taub hau hex hnyav thiab tsis muaj lwm yam kev teeb tsa tau tso cai. Tsis tas li ntawd, qhov ntev ntawm cov xov luv luv tsis tuaj yeem hloov pauv.

Txawm li cas los xij, raws li qhov kev qhia tshwj xeeb F3125 tshiab, txhua hom taub hau raug tso cai thiab qhov ntev ntawm xov tuaj yeem hloov pauv. Kev hloov pauv rau cov qauv A325 thiab A490 ib txwm muaj tau teev tseg los ntawm kev ntxiv "S" rau lub cim nqes hav tas mus li rau lub taub hau.

Lwm qhov sib txawv ntawm qhov ntev ntawm cov xov yog tias A325 bolts yog tsim tawm ntau hauv cov qauv puv-xov, muab tias lawv yog plaub txoj kab uas hla lossis tsawg dua hauv qhov ntev. Hom bolt no feem ntau hu ua A325T. Cov qauv puv-xov ntawm A325 bolt no tsis muaj rau A490 bolts.

Kev kuaj xyuas

Cov ntsia hlau A325 galvanized uas yuav nrog lub txiv ntoo thiab lub washer tawv yuav tsum tau kuaj lub peev xwm tig. Kev kuaj lub peev xwm tig ua kom ntseeg tau tias lub rooj sib dhos bolt muaj peev xwm tsim lub zog clamping kom raug. Yuav kom dhau qhov kev xeem, lub rooj sib dhos yuav tsum mus txog qhov tsawg kawg nkaus ntawm kev tig thiab ua tiav qhov kev nruj uas xav tau ua ntej ua tsis tiav uas nyob ntawm lub cheeb thiab ntev ntawm lub ntsia hlau galvanized A325. Vim tias A490 bolts tsis tuaj yeem galvanized, qhov kev xeem no tsis siv tau.

Txhua lub A490 bolts yuav tsum dhau qhov kev sim magnetic particle. Qhov kev sim no yog siv los xyuas kom meej tias tsis muaj qhov tsis zoo hauv qab lossis tawg hauv cov hlau ntawm A490 bolt. Qhov kev sim no tsis tas yuav tsum muaj rau A325 bolts.

ASTM A490

Cov Lus Qhia Tseem Ceeb

Thaum kawg, koj tus engineer yuav qhia meej tias koj yuav tsum siv qib twg ntawm F3125 structural bolt, tab sis nws yog ib qho tseem ceeb kom nkag siab txog qhov sib txawv ntawm A325 thiab A490 qib. Qib A490 muaj zog dua li qib A325, tab sis lub zog tsis yog tib qho uas txiav txim siab lub bolt. A490 bolts tsis tuaj yeem raug kub-dipped lossis mechanically galvanized. Qib A325 tsis muaj zog npaum li, tab sis nws yog lub bolt pheej yig dua uas tuaj yeem raug galvanized kom tsis txhob muaj xeb.