** 1. Dab tsi yog qhov sib txawv ntawm Astm A775 thiab A934? **
ASTM A775 thiab ASTM A934 yog ob qho qauv rau epoxy -} Coated kev txhawb nqa hlau tuav (rebar). Thawj qhov sib txawv ntawm lawv cov txheej txheem kev thov thiab qhov taw tes ntawm txheej.
* ** ASTM A775 ** DAIM NTAWV QHIA EMOXY- Coated rebar uas yog coated * tom qab * nws tau raug txiav thiab khoov rau nws cov duab kawg. Nov yog cov kev coj ua ib txwm siv rau cov haujlwm tsim kho tshiab.
* ** AVEM A934 ** DAIM NTAWV QHIA RAU EPOXY-} coated rebar uas yog coated * ua ntej * nws yog khoov. Tus rebar yog ces bent ntawm lub Hoobkas siv cov txuj ci tshwj xeeb uas tsis ua kev puas tsuaj. This standard is typically used for prefabricated rebar assemblies, where precise, factory-controlled bending is required.
** 2. Dab tsi yog Attm A312 yeeb nkab? **
ASTM A312 yog tus qauv txheem tshwj xeeb rau * seamless thiab welded ustenitic stainless hlau kav *. Cov kav dej no tau siv dav rau lawv cov kev ua tau corrosion zoo tshaj plaws thiab siab- lub zog. Cov kev siv cov ntaub ntawv feem ntau suav nrog cov nroj tsuag ua yeeb yam, cov nroj tsuag petrochemical, zaub mov thiab dej haus ua, kws tshuaj, thiab lub zog. Cov qhab nia feem ntau nyob rau hauv cov txheej txheem no yog TPPP34 / 304L thiab Tp316 / 316L.
** 3. Dab tsi yog qhov sib txawv ntawm Astm A790 thiab A789? **
ASTM A790 thiab A789 yog ob qho qauv rau * seamless thiab wended ferritic / Ausenitic Ruple Hlau Tube *. Cov ntsiab lus tseem ceeb yog lawv qhov npaj siv:
* ** ASTM A790 ** COV NEEG PIPES npaj rau * kev siv tshuab kho tshuab *. Nws yog tus qauv rau * Duplex Stainless Hlau Yeeb *.
* ** ASTM A789 ** NPAJ HLI YUAV RAU * Cov Khaub Ncaws Kub thiab Condenser Tubes, thiab Kev Pabcuam Dav Dav *. Nws yog tus qauv rau * Duplex Stainless Hlau Tubing *.
Qhov tseem ceeb tshaj plaws yog tias "yeeb nkab" feem ntau yog tsim los ntawm nominal cov yeeb nkab loj (NPS) thiab siv rau kev thauj cov kua dej. "Tubing" feem ntau yog xaiv los ntawm nws sab nraud ntawm txoj hlab ntsha thiab phab ntsa tuab, thiab feem ntau siv hauv cov ntawv thov txheej txheem lossis kev hloov cua sov.
** 4. Dab tsi yog A790 yeeb nkab ua los ntawm? **
ASTM A790 cov yeeb nkab yog tsim los ntawm * Duplex (Ferritic / Ausenitic) Stainless Hlau *. Qhov no yog tsev neeg ntawm stainless cov hlau uas muaj kev sib xyaw microstructure ntawm li 50% ferrite thiab 50% tsis muaj zog thiab zoo heev rau kev ntxhov siab corrosion. Cov qeb uas nquag muaj qib nyob rau hauv A790 tus qauv suav nrog:
* ** S31803: ** Tus qauv duplex qib.
* ** S32205: ** Qib DuPlex uas muaj kev sib xyaw ua kom nruj, feem ntau suav tias yog tus qauv rau 2205 duplex.
* ** S32750: ** Super Duplex (piv txwv li, 2507), muab lub zog siab dua thiab corrosion tsis kam.
* ** S32760: ** Lwm qib duplex (piv txwv li, zeron 100).
** 5. Dab tsi yog ASTM A995 GR 4A sib npaug rau? **
ASTM A995 Qib 4A yog cov nrum duplex cov khoom siv rau li li qub, fittings, thiab lwm yam siab-}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} nws muaj castings. Nws cov kev pom zoo thiab feem ntau dav muaj cov kev pom zoo (forged lossis dov) sib npaug yog ** uns unic s32205 **, feem ntau hu ua ** 2205 duplex stainless hlau. Qhov no txhais tau tias kev ua tiav ntawm A995 GR 4A muaj cov yeeb nkab zoo sib xws thiab haum ua los ntawm wrought 2205 ntawm cov neeg ASTM A790).
