Carbon steel screws - Hla 90% ntawm cov ntsia hlau yog ua los ntawm carbon vim lawv muaj cov khoom ua zoo thiab yog ib qho yooj yim mus nrhiav thiab pheej yig. Carbon steel screws muaj ntau tshaj 100 qib tau zoo, thiab feem ntau yog siv rau cov hom phiaj tshwj xeeb. Muaj ntau ntau cov qhab nee uas feem ntau siv hauv kev ua vaj tsev. Lub zog ntawm carbon steel screws faib rau peb pawg: qis carbon (cov ntsiab lus <0.3%), nruab="" nrab="" carbon="" steel="" (carbon="" cov="" ntsiab="" lus="" 0.3="" ~="" 0.6%)="" thiab="" hlau=""> Cov hlau txhuam ua rau cov hlau tsis sib haum (cov ntsiab lus ntawm cov hlau thooj <8%) thiab="" cov="" hlau="" phom="" siab="" (cov="" ntsiab="" lus="" ntawm="" cov="" hlab="" pas=""> 8%), cov pa roj carbon dioxide (cov ntsiab lus> 0.6%) tsis haum rau kev tsim mus rau lawv lub zog siab thiab nyuaj nyob rau hauv kev ua. Tam sim no, qhov feem ntau raug nplua los ntawm txoj kev ua lag luam yog SAE J429 cov ciaj ciam grading system. Muaj cov qhab-nees 10 qib ntawm cov uas tsis muaj cov menyuam kawm qib 1 txog hlau hlau grade 8, uas cov qhab nia tseem ceeb tshaj plaws kuj raug hais txog ASTM cov kev cai, xws li A307, A449, A325, thiab A354. Thiab A490 thiab hais txog. Cov txheej txheem grading rau metric carbon hlau screws piav nyob rau hauv ISO 898 / kuv yog zoo ib yam li SAE J429. ASTM F568 yog ib qho tseem ceeb ntawm ISO 898 / I thiab piav qhia txog kev faib tawm ntawm cov ciaj ntswj feem ntau siv hauv North America.
Cov tshuaj qes qes siv feem ntau yog AISI 1006, 1008, 1016, 1018, 1021 thiab 1022, xws li qhov ntsuas ntawm qib SAE 1, ASTM A307 Chav Kawm A, ASTM F568 Chav Kawm Ntawv 4.6, nrog kev ua haujlwm zoo, tuaj yeem Ua Haujlwm Txias txhim kho lub dag lub zog thiab tuaj yeem ua tau tawv tawv thiab khov kho. Qeb A307 Qib B yog siv rau fittings thiab flanges. Tsuas pub ntxiv rau qhov siab tshaj plaws ntawm lub zog tensile, lwm cov khoom yog tib yam li Qib A307 A. Lub hom phiaj ntawm qhov siab tshaj plaws ntawm qhov muaj zog tensile lub zog yog ua rau lub pluaj flange ua ntej nws lov thaum lub hau ntses tshaj, li tiv thaiv cov cuab yeej kim dua, qub, thiab lwm yam.
Nruab nrab carbon steel screws tau ho ua rau lawv lub zog tensile los ntawm kev kho tshav kub. Cov ntaub ntawv nquag siv yog AISI 1030, 1035, 1038 thiab 1541. Cov ntaub ntawv no muaj kev ua haujlwm zoo, tab sis thaum cov ntsiab lus qis dua, cov teeb meem ua rau qis dua. Vim hais tias cov cuab yeej thiab moulds siv rau cov cuab yeej siv tau yooj yim hnav, txoj kev pab lub neej txo. Yog li, kev coj ua los yog kev ua kom khov kho feem ntau yog ua ntej ua kom txo tau lub zog thiab pab txhawb txoj siav. Piv txwv, yog tias cov ntsiab lus qis tshaj li 0.5%, kev nplawm thiab kev ua haujlwm yuav ua rau kev faib tawm ntawm ntau lub cev thiab kev ua kom zoo dua qub. Yog hais tias cov ntsiab lus carbon ntau tshaj 0.5%, nws yuav ua tau spheroidized los txhim kho kev ua tau zoo.
Lub zog ntawm lub ntsuas cua kub-tau kho yog ncaj qha ntsig txog qhov loj ntawm lub hau ntswj. Thaum twg cov tshuaj lom neeg muaj pes tsawg leeg ntawm lub hau yog tib yam thiab cov kev kho kom sov yog tib yam, qhov loj dua qhov loj, qhov qis zog. Piv txwv, lub zog SAE qib 5 thiab ASTM A449's imperial screw yog loj. Qhov loj me me tshaj qhov loj. Txawm li cas los, ISO 8.8 thiab 9.8 metric screws tsis yog raws nraim tib yam. 9.8 screws nrog ib lub cheeb ntawm 16 mm los yog tsawg dua zog dua, tab sis 8.8-qib screws muaj zog dua. Kev siv cov pa nruab nrab yuav tsim tau 8.8 qib 24 hli ntsia hlau muaj zog, yog hais tias tsim tau 24 hli lossis ntau dua, koj yuav tsum siv hlau hlau, xws li qib 10.9, thiab kev kho cua kub tom qab lub zog yuav zoo nkauj tshaj.
Cov ntsuas kub uas tau kho kub tau kho siab muaj zog dua ib lub tsev nqi zog dua lwm cov hlau, thaum lub zog tawm ntawm lub zog ntawm lub zog tensile yog qhov qis tshaj, qhia tau zoo heev ntawm lub cev thiab qhov sib npaug zoo ntawm cov ntaub ntawv. Qhov no yog vim li cas SAE Class 5, ASTM A449, ASTM A325, F568 8.8, thiab 9.8 yog cov feem xyuam siv cov ntsia thawv muaj zog vim yog lawv cov nqi, kev tsim ua kom yooj yim, thiab cov khoom siv dag zog.
Thaum cov ntsiab lus ntawm cov manganese hauv cov phom ntau dua li 1.65%, silicon cov ntsiab lus ntau dua 0.6%, cov ntsiab lus tooj liab ntau dua 0.6%, los yog chromium cov ntsiab lus yog tsawg dua 4% (yog tshaj 4%, nws yog nyob ze ntawm stainless steel), los yog muaj ib qho cim tseg ntawm txhuas, tooj liab, boron, cobalt, molybdenum, npib tsib xees, titanium, vanadium, zirconium, los yog lwm yam ntxiv los tsim ib cov degree ntawm kev xav, lub sij hawm no yog hu ua hlau alloy. Feem ntau siv hlau phom ntau yog AISI 1335 (manganese steel), 4037 (molybdenum steel), 4140 (chrome molybdenum steel), 4340 (nickel-chromium-molybdenum steel), 8637 (nickel-chromium-molybdenum steel), thiab 8740 ( nickel-chromium-molybdenum hlau), Tsuav koj to taub nws cov khoom txhua yam, koj paub tias vim li cas nws thiaj li siv dav.