ASTM A252 yog tus qauv rau welded thiab seamless steel yeeb nkab pawg tsim los ntawm American Society for Testing and Materials (ASTM). Qhov tseeb version yog ASTM A252 / A252M-22. Cov qauv no qhia txog cov khoom siv, qhov ntev, cov khoom, thiab cov kev xav tau ntawm cov yeeb nkab steel siv rau kev txhawb nqa, thiab muaj feem xyuam rau engineering xws li kev tsim vaj tsev, txuas hniav, thiab chaw nres nkoj.
Daim ntawv thov
- Siv: Feem ntau yog siv hauv kev tsim vaj tsev sib sib zog nqus, xws li choj pawg hauv paus, siab - nce lub hauv paus, thiab chaw nres nkoj thiab wharf txhawb nqa.
- Pipe Diameter thiab Phab Ntsa Thickness:
- Nominal Pipe Diameter (NPS): Feem ntau NPS 8 txog 142 (kwv yees li 219 mm txog 3620 mm), qhov ntev tshwj xeeb xa mus rau ANSI B36.10.
- Phab ntsa Thickness: Kho raws li kev tsim qauv, ntau yam yog 6 hli txog 25 hli.
- Steel Qib Classification:
- Gr.1: Yield zog Ntau dua los yog sib npaug rau 248 MPa (36 ksi), haum rau cov khoom thauj zoo tib yam.
- Gr.2: Yield zog Ntau dua los yog sib npaug rau 345 MPa (50 ksi), haum rau nruab nrab loads.
- Gr.3: Yield zog Ntau dua los yog sib npaug rau 414 MPa (60 ksi), haum rau cov khoom siv siab lossis qhov chaw nyuaj.
Cov yam ntxwv ua haujlwm
- Siab zog thiab corrosion kuj:
- Siv qis- carbon steel lossis qis- alloy steel (xws li Q345B, API 5L X65), welds tsis tu ncua yog tsim los ntawm cov txheej txheem welding, ua rau muaj zog tag nrho.
- Kev tiv thaiv corrosion tuaj yeem txhim kho thiab kev pabcuam lub neej txuas ntxiv los ntawm 3PE txheej, epoxy hmoov txheej, lossis kev tiv thaiv cathodic.
- Kev yooj yim ntawm kev tsim kho:
- Kauv steel yeeb nkab pawg tuaj yeem muaj qhov ntev ntawm 5.8m txog 30m, txo ntawm - qhov chaw ua haujlwm splicing thiab txhim kho kev tsim kho.
- Kev txhim kho sai yog ua tau los ntawm kev sib txuas ntawm vuam lossis flange, hloov mus rau qhov nyuaj geological.
- Seismic Resistance thiab Durability:
- Uniformly faib kauv welds muab cov yeeb nkab steel nrog kev yooj yooj yim thiab cuam tshuam, ua rau lawv tsim nyog rau av qeeg- thaj chaw uas muaj xwm txheej.
Vuam txheej txheem thiab kev tswj kom zoo
- Txheej txheem ntau lawm:
1. Raw Material Inspection: Cov tshuaj muaj pes tsawg leeg thiab txhua yam khoom ntawm cov hlau sawb yuav tsum ua tau raws li ASTM A252 cov cai.
2. Kev tsim thiab Vuam: Cov hlau sawb yog tsim los ntawm lub tshuab spiral dov thiab welded siv submerged arc vuam (SAW) lossis siab - zaus vuam (HFW) cov txheej txheem. Weld seams yuav tsum tau kuaj xyuas los ntawm X-ray flaw detection.
3. Dimensional Calibration: Tswj cov kab sab nraud thiab phab ntsa thickness tolerances (xws li, txheej kab sib txawv ± 0.5%, phab ntsa thickness sib txawv ± 10%).
4. Kev Ntsuam Xyuas Kev Ua Haujlwm: Ua qhov ntsuas hydrostatic (siab dua lossis sib npaug ntawm 1.5 npaug ntawm qhov tsim siab), ntsuas tensile, ntsuas kev khoov, thiab lwm yam.
- Kev tiv thaiv corrosion:
Qib tshem tawm xeb ntawm qhov chaw yuav tsum ncav cuag Sa2.5 (ze -dawb). Cov txheej thickness yog xaiv raws li ib puag ncig yuav tsum tau (xws li, 3PE txheej thickness Ntau tshaj los yog sib npaug rau 2.5 hli).
A252 GR3 piling yeeb nkab Hoobkas
