ASTM A450 Alloy Seamless Steel Yeeb Nkab: Ib Daim Ntawv Qhia Txog Kev Qhia
1. Cov Ntsiab Lus Tseem Ceeb: Cov Lus Qhia Tshwj Xeeb
ASTM A 450 1.5 hli(Standard Specification for General Requirements for Carbon and Alloy Steel Tubes) tsis yog ib qho khoom siv tshwj xeeb. Nws yog ib"Cov Lus Qhia General"specification uas yuav tsum tau invoked nrog rau tej yam khoom specifications (xws li, ASTM A213, A335). Nws txhais covcov qauv kev sim, cov txheej txheem, kam rau ua, thiab kev coj uauas tsis yog tag nrho cov ncauj lus kom ntxaws nyob rau hauv tus kheej cov qauv khoom.
Yog li ntawd, ib tug raug callout rau ib tug alloy seamless yeeb nkab yuav yog:
ASTM A213 T11 / ASTM A450 Cov Lus Qhia Tshwj Xeeb
Qhov no txhais tau hais tias cov yeeb nkab yog tsim los rau cov kev xav tau ntawmob leegCov khoom specification (A213 rau cov khoom siv thiab qhov loj me) thiab cov lus qhia dav dav (A450 rau kev kuaj, tshuaj xyuas, thiab lwm yam).
2. Associated Alloy Seamless Pipe Khoom Specifications
Cov khoom tshwj xeeb tshaj plaws rau cov kav hlau tsis sib haum uas siv A450 raws li lawv cov kev cai dav dav yog:
| Specification | Title | Daim ntawv thov tseem ceeb | Cov Qib Siab |
|---|---|---|---|
| ASTM A213 / A213M / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / A213M / ASTM A213 / ASTM A213 / A213M / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213 / ASTM A213) thiab ASTM A213 | Seamless Ferritic thiab Austenitic Alloy-Steel Boiler, Superheater, thiab Thaum tshav kub kub-Tub Exchanger | Boiler tubes, superheater tubes, tshav kub exchanger raj hauv fais fab nroj tsuag & refineries. Siab - kub, siab - kev pabcuam siab. | Ferritic Alloy: T5, T9, T11, T22, T91 Austenitic Stainless hlau:TP304H, TP316L, TP321H |
| ASTM A335/A335M | Seamless Ferritic Alloy-Steel Yeeb Nkab rau Siab-Tsev Kev Pabcuam | Siab -Cov txheej txheem kub ntawm cov kav dej, lub ntsiab chav dej & cov kab kub reheat nyob rau hauv cov fais fab nroj tsuag, refinery piping. | P5, P9, P11, P22, P91, P92 |
3. Cov Lus Qhia Tseem Ceeb raws li ASTM A450 (Cov Lus Qhia)
| Yam | Cov Lus Qhia dav dav rau ASTM A450 |
|---|---|
| Kev tsim khoom | Cov yeeb nkab yuav tsum tau ua los ntawm cov txheej txheem seamless (kub tiav lossis txias kos). |
| Kev kho cua sov | Tag nrho cov raj / cov kav dej yuav tsum tau muab rau hauv qhov cua sov- kho mob (annealed, normalized & tempered, thiab lwm yam). A450 tswj qhov kub thiab txias sib xws, huab cua, thiab cov txheej txheem. |
| Tshuaj ntsuam xyuas | Cov txheej txheem rau spectrochemical los yog cov tshuaj ntub dej tshuaj ntsuam xyuas yog tus qauv. Cov tshuaj muaj pes tsawg leeg tshwj xeeb yog nyob rau hauv cov khoom spec (A213, A335). |
| Tensile Test | Qhia txog txoj kev xeem, kev npaj cov qauv, thiab cov txheej txheem. Lub zog & elongation qhov tseem ceeb yog nyob rau hauv cov khoom spec. |
| Hardness Test | Tej zaum yuav xav tau. Txoj kev (Brinell, Rockwell) thiab sampling yog cov ncauj lus kom ntxaws. |
| Flattening Test | Standardized txheej txheem rau ductility kuaj ntawm ib lub nplhaib qauv los ntawm txhua lub tshav kub / ntau. |
| Hydrostatic Test | Txhua daimyuav tsum tau kuaj tshwj tsis yog hloov los ntawm NDE. Kev ntsuas siab yog xam raws tus qauv A450 (raws li kev ntxhov siab, phab ntsa thickness, thiab txoj kab uas hla). |
| Nondestructive Test (NDE) | Tso cai los yog yuav tsum tauEddy Tam sim no (ET)los yogKev kuaj Ultrasonic (UT)raws li kev ntxiv lossis lwm txoj rau hydrotest, yog tias tau teev tseg ntawm kev yuav khoom. |
| Dimensions & Tolerances | Muabdefault roojrau OD, phab ntsa thickness, ntev, thiab hnyav kam rau ua. Cov khoom spec's kam rau ua ua ntej yog muab. |
| Pom Zoo | Cov yeeb nkab yuav tsum muaj cov neeg ua haujlwm tiav, tsis muaj qhov tsis xws luag rau nws daim ntawv thov. |
| Marking & Ntim | Txuj rau kev npaj pob khoom, cim cim, thiab kev tiv thaiv kev xa khoom. |
4. Cov ntawv thov ib txwm
Vim yog qhov siab - qhov kub thiab txias ntawm cov qib alloy (A213, A335), cov kav dej tswj hwm los ntawm cov specs no + A450 yog siv hauv:
Kev tsim hluav taws xob:Boiler tubes, superheaters, reheaters, thiab siab -kub kab nyob rau hauv fossil roj thiab nuclear fais fab nroj tsuag.
Petrochemical thiab Refining:Hluav taws kub cua sov raj, cov raj hloov kho, qhov cub tawg, thiab siab -kub txheej txheem piping.
Thaum tshav kub kub Distribution:High-siab, siab-kub hauv cheeb tsam cua sov tshuab.
5. Kev txiav txim siab tseem ceeb rau kev yuav khoom
Nco ntsoov qhia covua tiav lub npe: Khoom Specification + Qib + General Requirements (piv txwv li,ASTM A335 P11 S / ASTM A450 Cov Lus Qhia Tshwj Xeeb).
S= seamless.A450yog implied tab sis yuav tsum tau hais.
Qhia meej yog tiasntxiv NDE(UT lossis ET) yuav tsum dhau qhov kev ntsuas hydrostatic.
Txheeb xyuas qhov twglub rooj kam rau siabsiv (A450 default lossis cov khoom spec lub rooj).
Tshawb xyuas qhov xav taucov ntawv xeem(Mill Test Certificate ib A450 yuav suav nrog cov txiaj ntsig tshuaj lom neeg thiab cov khoom siv tshuab).
Quick-Table Reference: Cov Khoom Tseem Ceeb Specs vs. A450 Role
| Yam khoom | Txhais los ntawm Cov Khoom Spec (piv txwv li, A213, A335) | Tswj los ntawm ASTM A450 (thaum hu ua) |
|---|---|---|
| Khoom Qib & Chemistry | ✓ | – |
| Yam tsawg kawg Tensile/Yield Strength | ✓ | – |
| Thaum tshav kub kub kho kub | ✓ (hom) | ✓ (txheej txheem & tswj) |
| Hydrostatic Test Siab | – | ✓ (formula & xav tau) |
| Flattening Test txheej txheem | – | ✓ |
| OD / Phab ntsa kam rau ua (default) | – | ✓ |
| Marking Standard | – | ✓ |
| Cov txheej txheem tsis sib haum xeeb & rov ntsuas dua | – | ✓ |
Hauv cov ntsiab lus,ASTM A450 yog cov ntaub ntawv tseem ceeb rau kev kuaj thiab tshuaj xyuas, thaumASTM A213 / A335 txhais cov khoom siv thiab nws cov khoom siv tshuab tseem ceeb. Ua ke, lawv ua kom ntseeg tau qhov zoo thiab kev ntseeg siab ntawm cov kav hlau tsis muaj steel hlau rau qhov tseem ceeb siab - cov kev pabcuam kub.
