### 1. ASTM A312 yeeb nkab yog dab tsi?
ASTM A312 yeeb nkab yog ib qho kev qhia tshwj xeeb rau seamless, welded, thiab txias hnyav - ua haujlwm stainless hlau kav. Cov kav dej no yog tsim los rau siab -kub thiab corrosive kev pabcuam. Lub npe "A312" yog hais txog tus qauv nws tus kheej, uas teev cov kev xav tau ntawm qhov ntev, cov khoom siv kho tshuab, tshuaj muaj pes tsawg leeg, thiab kev sim. Nws tsis qhia ib qib ntawm stainless hlau tab sis npog ntau yam ntawm cov qib austenitic xws li TP304, TP316, TP321, thiab lwm yam. Cov kav dej ua rau tus qauv no feem ntau siv hauv kev lag luam xws li kev ua tshuaj lom neeg, roj thiab roj, tsim hluav taws xob, thiab khoom noj khoom haus thiab dej haus.
### 2. 321 yeeb nkab yog dab tsi?
ASTM A312 TP321 yog tsim los ntawm austenitic stainless hlau. Nws cov tshuaj muaj pes tsawg leeg yog raws li chromium thiab npib tsib xee, nrog rau qhov tseem ceeb ntxiv ntawm titanium. Lub ntsiab muaj pes tsawg leeg yog:
* ** Chromium (Cr):** 17.0 - 19.0%
* ** Nickel (Ni):** 9.0 - 12.0%
* ** Carbon (C): ** 0.08% siab tshaj
* ** Titanium (Ti): ** Tsawg kawg ntawm 5 npaug ntawm cov ntsiab lus carbon, tab sis tsis ntau tshaj 0.70%
* ** Manganese (Mn): ** 2.0% siab tshaj
* ** Silicon (Si): ** 0.75% siab tshaj
* ** Phosphorus (P): ** 0.045% siab tshaj
* ** Sulfur (S): ** 0.030% siab tshaj
* ** Hlau (Fe): ** Sib npaug
Lub hom phiaj tseem ceeb ntawm kev ntxiv titanium yog kom ruaj khov rau cov hlau tiv thaiv chromium carbide nag lossis daus thaum raug kub kub, uas tiv thaiv rhiab heev thiab txhim kho intergranular corrosion kuj.
### 3. Cov khoom ntawm ASTM A312 yog dab tsi?
"ASTM A312 khoom" tsis yog ib qho muaj pes tsawg leeg. ASTM A312 yog tus qauv uas suav nrog ntau qib sib txawv ntawm cov hlau tsis muaj steel. Yog li ntawd, qhov muaj pes tsawg leeg yog nyob ntawm cov qib tshwj xeeb. Piv txwv li:
* ** A312 TP304:** Muaj li ntawm 18-20% Chromium thiab 8-11% Nickel.
* ** A312 TP316:** Muaj 16-18% Chromium, 10-14% Nickel, thiab 2-3% Molybdenum.
* ** A312 TP321:** Muaj 17-19% Chromium, 9-12% Nickel, thiab stabilized nrog Titanium.
* ** A312 TP310:** Muaj cov qib siab dua ntawm Chromium (24-26%) thiab Nickel (19-22%) rau kev txhim kho qhov kub thiab txias oxidation tsis kam.
Txhawm rau paub qhov muaj pes tsawg leeg, koj yuav tsum xa mus rau cov qib tshwj xeeb (xws li A312 TP316) hauv tus qauv.
### 4. Qhov txawv ntawm ASTM A312 thiab 316 yog dab tsi?
Qhov no yog ib qho kev tsis meej pem. Qhov txawv yog tias lawv tsis yog cov koom haum sib piv.
* ** ASTM A312 ** yog ** tus qauv specification ** uas txhais tau tias yuav tsum tau ua rau stainless hlau kav (qhov ntev, kam rau ua, kuaj, thiab lwm yam).
* ** 316 ** (los yog ntau dua precisely, ** ASTM A312 TP316 **) yog ib qho tshwj xeeb ** qib ntawm cov khoom ** (ib hom stainless hlau alloy) uas yog ua raws li tus qauv A312.
Hauv cov ntsiab lus yooj yim, ** ASTM A312 yog phau ntawv tswj, thiab 316 yog ib qho ntawm cov players.** Koj tuaj yeem muaj A312 yeeb nkab ua los ntawm 304, 316, 321, lossis ob peb lwm qib. Qhov sib txawv tseem ceeb yog 316 stainless hlau muaj molybdenum, uas ua rau nws zoo dua corrosion kuj, tshwj xeeb tshaj yog tiv thaiv chlorides thiab acids, piv rau tus qauv qib zoo li 304.
5.Qhov muaj pes tsawg leeg ntawm ASTM A312 yog dab tsi?
Cov ntsiab lus tseem ceeb yog:
Chromium (Cr):~ 16-20% (Muab corrosion kuj)
Nickel (Ni):~ 8-14% (Muab austenitic qauv thiab toughness)
Cov pa roj carbon (C):Feem ntau 0.08% max lossis 0.03% max rau qib "L" (Cov pa roj carbon tsawg rau kev txhim kho weldability thiab tiv thaiv carbide nag lossis daus).
Lwm cov ntsiab lus xws li Molybdenum (hauv TP316) lossis Titanium (hauv TP321) tau ntxiv rau cov qib tshwj xeeb rau cov khoom siv kho kom zoo.
