Q1: Thaum sib piv cov kav hlau tsis muaj steel, Suav sib npaug ntawm ASTM A312 Qib TP304 yog dab tsi?
A1:ASTM A312 TP304 sib raug rauGB/T 14976 Qib 06Cr19Ni10(yav tas los hu ua 0Cr18Ni9). Cov tshuaj muaj pes tsawg leeg yuav luag zoo ib yam: 18% Cr thiab 8% Ni. Cov txheej txheem Asmeskas feem ntau hais txog cov ntsiab lus qis me ntsis (0.08% max) piv rau cov laus Suav 0Cr18Ni9, tab sis tus qauv tshiab 06Cr19Ni10 ua tib zoo. Rau welded structural stainless kav,GB/T 12771yog tus qauv tsim, tab sis cov khoom qib tseem tshuav 06Cr19Ni10 kom phim TP304 -3.
Q2: Rau siab -kub siv stainless hlau, Teb Chaws Asmeskas siv ASTM A312 TP316. Qhov tshwj xeeb Suav qib tsom iav qhov 2% Molybdenum ntxiv rau cov tshuaj chloride?
A2:ASTM A312 TP316 yuav tsum tau ntxiv ntawm Molybdenum (2.00-3.00%) rau kev txhim kho corrosion kuj. Qhov ncaj Suav sib npaug yogGB/T 14976 Qib 06Cr17Ni12Mo2. Qib no, yav tas los hu ua 0Cr17Ni12Mo2, muaj qhov tsim nyog Mo los tiv thaiv pitting. Rau welded kav,GB/T 12771siv tib yam 06Cr17Ni12Mo2 chemistry. Nws yog ib qho tseem ceeb kom tsis txhob hloov TP304 (tsis muaj Moly) rau TP316; Suav 06Cr17Ni12Mo2 tsuas yog qhov sib npaug -3.
Q3: Hauv kev lag luam roj thiab roj, dab tsi yog Suav sib npaug ntawm American duplex stainless hlau qib ASTM A789 UNS S31803 rau welded tubing?
A3:UNS S31803 (Duplex 2205) yog raws li tus qauv SuavGB/T 21833 Qib 022Cr22Ni5Mo3N. Qib Suav no rov ua dua dual -theem microstructure (50% ferrite / 50% austenite) xav tau los ntawm ASTM A789. Lub zog tawm los rau ob tus qauv yog nyob ib puag ncig 450 MPa, kwv yees li ob npaug ntawm cov qib austenitic. Rau cov kav dej welded, cov khoom siv hluav taws xob yuav tsum tau tswj kom sib npaug hauv ob qho tib si kom tsis txhob muaj nag lossis daus ntawm cov txheej txheem intermetallic -3.
Q4: Yuav ua li cas Suav tus qauv rau galvanized yeeb nkab (GB / T 3091) piv rau American ASTM A53 galvanized specification hais txog txheej hnyav?
A4:Thaum ob qho tib si sivQ235B(Suav teb) thiabASTM A53 Gr B(US) raws li lub hauv paus hlau, txheej sib npaug sib txawv. ASTM A53 yuav tsum muaj qhov hnyav ntawm qhov hnyav ntawm 1.8 oz / ft² (kwv yees . 550 g / m²) rau lub sijhawm 40 yeeb nkab. Suav GB / T 3091 feem ntau xav tau txheej hnyav ntawm 300 g / m² rau cov qauv galvanizing, nce mus txog 500 g / m² rau cov txheej hnyav. Yog li ntawd, kom ua tau raws li Asmeskas cov lus qhia tshwj xeeb, cov yeeb nkab suav yuav tsum raug txiav txim nrog "hnyav galvanizing" ntxiv kom tau raws li ASTM A53 thickness qauv -7.
Q5: Rau kev pabcuam cryogenic mus rau -196 degree, Tebchaws Asmeskas siv ASTM A358 (welded austenitic stainless). Puas yog Tuam Tshoj muaj qhov sib npaug tshwj xeeb rau cov qauv welded yeeb nkab no?
A5:Yog lawm, ASTM A358 (Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe)) rau cov kev pabcuam cryogenic sib haum rauGB/T 12771 Qib 06Cr19Ni10(rau TP304) los yog06Cr17Ni12Mo2(rau TP316). Txawm li cas los xij, GB / T 12771 npog ntau txoj kev vuam (xws li plasma arc thiab TIG). Rau qhov sib npaug nruj rau A358 Chav Kawm 1 (tag nrho cov duab hluav taws xob), cov yeeb nkab suav yuav tsum tau kuaj 100% X-ray thiab kuaj hydrostatic, uas yog ib qho kev xav tau ntxiv feem ntau thov los ntawm cov neeg yuav khoom, txawm tias tus qauv GB / T 12771 tso cai rau kev kuaj xyuas qhov chaw -3.
