Cov kav hlauraug cais los ntawm cov duab sib dhos rau hauv lub voj voog, square, duab plaub, thiab cov kav dej tshwj xeeb; los ntawm cov khoom siv rau hauv cov pa roj carbon structural steel kav, low-alloy structural steel kav, alloy steel kav, thiab cov kav dej sib xyaw; thiab los ntawm kev siv rau hauv cov kav dej rau kev xa cov kav dej, cov qauv tsim vaj tsev, cov khoom siv thermal, petrochemical industries, machinery manufacturing, geological drilling, thiab cov cuab yeej siv siab. Los ntawm cov txheej txheem ntau lawm, lawv tau muab faib ua seamless steel kav thiab welded steel kav. Seamless steel kav txuas ntxiv rau hauv kub-kuav los tiag thiab txias-kuav los tiag (kos) hom, thaum welded steel kav yog subdivided rau hauv ncaj seam welded kav thiab kauv seam welded kav.
Muaj ntau txoj hauv kev los sawv cev rau cov yeeb nkab dimensional parameters. Hauv qab no yog cov lus piav qhia rau feem ntau siv yeeb nkab qhov ntev: NPS, DN, OD thiab Teem sijhawm.
(1) NPS (Nominal Pipe Size)
NPS yog North American tus qauv rau high / low-pressure thiab high / low-temperature kav. Nws yog ib tug dimensionless tooj siv los qhia txog cov yeeb nkab loj. Tus lej tom qab NPS qhia txog tus qauv yeeb nkab loj.
NPS yog raws li IPS ua ntej (Iron Pipe Size) system. IPS system tau tsim los sib txawv qhov ntau thiab tsawg ntawm cov yeeb nkab, nrog qhov ntev ntawm cov ntiv tes sawv cev rau qhov kwv yees sab hauv txoj kab uas hla. Piv txwv li, IPS 6" yeeb nkab qhia txog ib txoj kab uas hla ntawm 6 ntiv tes.
(2) Nominal Diameter DN (Dab Nominal)
Nominal Diameter DN: Lwm tus sawv cev rau nominal txoj kab uas hla (bore). Siv nyob rau hauv piping systems raws li ib tsab ntawv-ntaus sib xyaw identifier, muaj cov ntawv DN ua raws li ib tug dimensionless integer. Nws yuav tsum tau muab sau tseg tias DN nominal bore yog ib tug yooj yim rounded integer rau siv lub hom phiaj, bearing tsuas yog ib tug xoob kev sib raug zoo rau qhov tseeb manufacturing qhov ntev. Tus lej tom qab DN feem ntau yog qhov ntev ntawm millimeters (mm). Hauv Suav cov qauv, cov yeeb nkab diameters feem ntau txhais tau tias yog DNXX, xws li DN50.
Pipe diameters encompass outer diameter (OD), puab txoj kab uas hla (ID), thiab nominal txoj kab uas hla (DN/NPS). Qhov nominal txoj kab uas hla (DN / NPS) tsis sib haum mus rau qhov tseeb sab nrauv los yog puab txoj kab uas hla ntawm cov yeeb nkab. Thaum lub sij hawm tsim khoom thiab kev teeb tsa, qhov sib thooj sab nraud thiab phab ntsa tuab yuav tsum tau txiav txim siab raws li cov qauv kev qhia tshwj xeeb los xam cov yeeb nkab sab hauv txoj kab uas hla.
(3) Sab nraud txoj kab uas hla (OD)
Outer Diameter (OD): Lub cim rau sab nraud yog Φ, thiab nws tuaj yeem txhais tau tias yog OD. Thoob plaws ntiaj teb, cov kav dej steel siv rau cov dej xa tawm feem ntau tau muab faib ua ob txoj kab uas hla sab nraud: Series A (qhov loj dua sab nraud, imperial) thiab Series B (cov kab me me, metric).
Ntau cov yeeb nkab steel txheej txheej muaj nyob thoob ntiaj teb, xws li ISO (International Organization for Standardization), JIS (Nyiv), DIN (Lub Tebchaws Yelemees), thiab BS (UK).
(4) Yeeb Nkab Phab Ntsa Thickness Teem caij
Thaum Lub Peb Hlis Ntuj xyoo 1927, Pawg Neeg Saib Xyuas Kev Cai Asmeskas tau ua ib qho kev soj ntsuam kev lag luam thiab qhia me me ntxiv ntawm ob qib thawj cov yeeb nkab phab ntsa tuab. Qhov system no siv SCH los qhia txog qhov nominal thickness ntawm cov kav dej.
EHONG STEEL--steel yeeb nkab qhov ntev
Post lub sij hawm: Aug-22-2025
