Cov ntsiab lus ceev
ASTM A519: Qhov no yog tus qauv uas qhia meej txog qhov yuav tsum tau ua rauSeamless Carbon thiab Alloy Steel Neeg Kho Tshuab TubingCov. Nws tsom rau cov cuab yeej ua haujlwm (zoo li tensile lub zog thiab hardness) thiab cov tshuaj lom neeg.
SAE 4140: Qhov no yog qhov tshwj xeebteem nqiNtawm alloy steel txhais tau los ntawm lub zej zog ntawm cov tshuab tsheb uas muaj cov lag luam. Nws yog chromium - molybdenum steel paub rau nws lub zog siab, kev ua kom zoo thiab hnav tsis zoo.
Tsis ntse: Cov yeeb nkab yog tsim los ntawm tho ib lub nplua billet, tsim lub raj uas tsis muaj ib lub raj welded. Qhov no ua rau nws muaj zog dua thiab txhim khu kev qha rau kev siab-} qhov kev siv siab.
Yog li ntawd,ASTM ASTM A 519 4140 Txoj yeeb nkab steelYog ib lub tshuab tsis muaj zog ua tau los ntawm 4140 alloy steel hlau, tsim kom tau raws li cov tshuaj thiab cov kws kho tshuab sau tseg hauv ASTM A519 tus qauv.
Cov yam ntxwv tseem ceeb ntawm SAE 4140 hlau
Cov khoom ntawm cov yeeb nkab tuaj ncaj qha los ntawm 4140 cov qib kawm.
Chemistry:
Cov pa roj carbon (c):~ 0.40% {-}}}}}}}}} muaj lub zog siab thiab nyuaj los ntawm kev kho cua sov.
Chromium (CR):~ 0.80 {{- 1. Tshauv - Ua kom muaj zog, txhim kho corrosion tsis kam, thiab txhim kho kev coj tawm tsam.
Molybdenum (MO):~ 0.15 {- 0.25% - txhim kho kom muaj zog thaum kub thiab nce zog.
Cov yam ntxwv tseem ceeb:
Lub zog siab:Tuaj yeem ua tau cov cua sov kom muaj zog ntau ntau.
Zoo toughness:Saib xyuas cov kev cuam tshuam zoo tseem nyob ntawm lub zog siab.
Hnav zoo heev:Qhov zoo tagnrho rau qhov uas yog kev sib txhuam thiab kev puas tsuaj.
Zoo nkees zog dag zog:Tsis kam ua tsis tiav hauv lub chaw thau khoom.
Cov Cuab Yeej Siv Cov Neeg Kho Tshuab hauv ib ASTM A519
ASTM A519 qhia meej cov khoom siv yam tsawg kawg raws li kev kho kom sov. Cov txiaj ntsig rau 4140 tuaj yeem sib txawv nyob ntawm seb nws puas tau qhia, qub thiab npau taws thiab npau taws.
Cov feem ntau muaj kev mob siab rau high - lub zog applications yogQuenched thiab tempered (Q & T).
Raug cov khoom siv neeg kho mob rau 4140 Q & T:
| Ntiag tug | Cov nqi raug (Q & T) | Sau ntawv |
|---|---|---|
| Lub zog tensile | 95, {{000 - 120, 000 psi ({{}} mpa mpa mpa mpa) | Tuaj yeem hloov kho los ntawm kev kub siab kub. |
| Paib lub zog | 60, {{000 - 100, 000 psi ({{}} mpa mpa) | Yuav tsum muaj tsawg kawg yog 60,000 psi (414 mpa) ib tus qauv. |
| Elongation (hauv 2 ") | 15% - 20% | Ntsuas ntawm ductility. |
| Kev nyuaj | {{0 {}} brinell (HB) | Kwv yees . 90 - 32 hrc. Dav kuj sib txawv. |
Lwm yam kev mob:
Annealed:Softer, yooj yim rau tshuab. Txo lub zog (~ 60-80 ksi tensile) thiab kev du ncauj dua.
Qub & Tempered:Kev sib npaug ntawm lub zog thiab machiness.
Cov Kev Siv Cov Ntawv Siv
Cov ntaub ntawv no yog xaiv rau cov ntawv thov uas xav tau kev sib xyaw ua ke ntawm lub zog siab, kav ntev, thiab tus qauv tsis sib xws.
Lub tog raj kheej kheej kheej kheej:Cov ntawv thov feem ntau. Siv rau high - kub cov rabs hydraulic hauv kev siv khoom (excavators, chaw tsim khoom machinery, thiab aerospace.
Lub hwj huam xa Shafting:Siv rau cov ntaub ntawv tsav, iav cov iav, thiab Axles uas muaj zog torsional siab.
Tshuab Cheebtsam:Rau zog, ntxaiv, bolts, thiab lwm yam tseem ceeb uas yauv kev ntxhov siab thiab hnav.
Roj & Roj Kev Lag Luam:Downhole tubing, mandrels, thiab lwm yam hauv cov cuab yeej siv WHHHEAD.
Kev sib tw tsheb:Txog siab -} Kev ua tiav kev ncua ntawv, xaim tawb, thiab tsav tsheb ciav hlau.
Qhov zoo ntawm kev siv ASTM A 519 4140 seamless yeeb
Tsis muaj Weld Seam:Tshem tawm cov peev xwm rau weld tsis xws luag, ua rau nws zoo dua rau high zoo rau high {0} - kev siv ntxhov siab.
Siab zog - rau - qhov hnyav. Piv:Tso cai rau kev tsim cov sib dua, cov khoom siv muaj zog.
Zoo heev tevasab (hauv annealed mob):Yuav muab tau yooj yim machined kom meej rau kev tiv thaiv ua ntej ua kom muaj kev kho cua sov kawg.
Pratalial tej yam khoom:Lub ASTM qauv ua kom ua tiav cov tshuaj thiab cov neeg kho tshuab siv.
Cov kev txiav txim tseem ceeb
Kev Kho Cua Sov:Cov khoom kawg tau ua tiav los ntawm kev kho cua sov (quenching thiab tempering). The condition you order (eg, annealed vs. Q&T) depends on your manufacturing process and end-use requirements.
Machining:4140 yog cov tawv tawv rau hauv nws cov xeev tawv tawv. Nws yog feem ntau machined nyob rau hauv ib analealed mob thiab tom qab ntawd kub-}} nrhiav kom ua tiav nws lub zog kawg.
Weldability:4140 muaj kev ncaj ncees weldability tab sis yuav tsum tau ua ntej {1} {} Weld -} be} cuam tshuam cheeb tsam (Haz). Nws tsis yog feem ntau xaiv rau cov ntaub uas cuam tshuam nrog vuam ntau heev.
Corrosion Kuj:Zoo li feem ntau carbon thiab alloy hlau, nws yog qhov raug cuam tshuam rau kev xeb thiab yuav xav tau ib qho kev tiv thaiv (pleev xim, plating, thiab lwm yam) yog tias siv hauv kev xeb ib puag ncig.
Yam Qauv
ASTM A106:Txheem rau seamless cov hlau yeeb nkab cov yeeb nkab rau high- kub kev pab. Qhov no yog rauSiab Piering, thaum A519 yog rauNeeg kho tshuab tubing.
SAE J412:Lwm tus qauv uas txhais tau 4140 qib steel.
Ams 6380 / AMS 6381:Aerospace Cov Khoom Siv Tshwj Xeeb rau 4140 Steel Seamless Tubing.
Hauv cov ntsiab lus xaus,ASTM ASTM A 519 4140 Txoj yeeb nkab steelYog tus nqi tshaj plaws - Cov khoom siv qib xaiv rau cov ntawv thov neeg kho tshuab uas tsis muaj kev xaiv. Nws seamless xwm thiab kev ua haujlwm siab ntawm 4140 alloy ua nws txoj kev xaiv txhim khu kev qha rau ntau yam kev lag luam.
