Q1: Thaum cuam tshuam nrog kev tiv thaiv hluav taws, Teb Chaws Asmeskas feem ntau siv ASTM A795 Qib B. Tus qauv Suav thiab qib twg suav tias yog sib npaug?
A1:ASTM A795 Qib B (dub thiab kub-dipped zinc-coated welded steel yeeb nkab) sib haum rauGB/T 3091 Q235B. Ob tus qauv tsom mus rau lub sijhawm teem sijhawm-raws li qhov ntev rau cov tshuab tua hluav taws. Thawj qhov sib npaug yog raws li qhov tsawg kawg nkaus tawm lub zog (205 MPa rau A795 vs 235 MPa rau Q235B, tab sis Q235B feem ntau muaj zog me ntsis) thiab qhov yuav tsum tau ua rau kev ntsuas hydrostatic. Txawm li cas los xij, galvanizing qhov yuav tsum tau sib txawv, nrog A795 feem ntau xav tau cov txheej hnyav dua (1.8 oz / ft²) piv rau tus qauv GB / T 3091 tshwj tsis yog tau teev tseg -7.
Q2: Yuav ua li cas American tus qauv yeeb nkab tsim "STD" (Standard) hnyav txhais rau Suav yeeb nkab specifications thaum sib piv cov qib zoo li 20 #?
A2:"STD" (Standard) yog lub sij hawm sib faib qhov hnyav, tsis yog qib. Thaum sib piv ASTM A53-B lossis A106-B rau Suav20#, lub sij hawm yuav tsum tau muab txhais los ntawm DN (Nominal Diameter). Piv txwv li, 8-nti ASTM STD yeeb nkab muaj phab ntsa tuab ntawm 8.18mm. Suav sib npaug raws li GB / T 8163 rau 20 # steel yuav yog "DN200 Sch 20" lossis "Sch 30," nyob ntawm qhov tshwj xeeb sab nraud txoj kab uas hla. Cov khoom siv qib sib npaug, tab sis qhov ntev ntawm lub rooj sib haum (ANSI B36.10 vs GB / T 17395) xav tau cov lus hloov pauv -1-8.
Q3: Cov kev txwv tshwj xeeb muaj dab tsi thaum hloov Suav Q195 rau American ASTM A53 Qib A hauv ERW welded raj?
A3:ASTM A53 Qib A yuav tsum muaj lub zog tensile ntawm 48,000 psi (331 MPa) thiab tawm los ntawm 30,000 psi (207 MPa). SuavQ195muaj qhov taw tes qis dua (195 MPa) thiab tensile (315-390 MPa). Thaum lub weldability ntawm Q195 yog qhov zoo heev, hloov nws rau A53 Qib A tsuas yog siv tau rau cov uas tsis yog -tseem ceeb, tsis muaj kev cuam tshuam cov vaj tse lossis cov qauv. Rau cov ntawv thov siab, Q195 ua tsis tau raws li qhov xav tau ntawm tensile yam tsawg kawg nkaus ntawm ASTM specification, ua10#qhov kev xaiv zoo dua rau qhov sib npaug -1-2.
Q4: Puas yog hais tias ASTM A106 Qib C muaj qhov sib npaug ncaj qha hauv Suav GB 5310 tus qauv, thiab yog tias muaj, nws yog dab tsi?
A4:Yog lawm, ASTM A106 Qib C, uas yuav tsum muaj lub zog tensile yam tsawg kawg nkaus ntawm 485 MPa thiab tawm los ntawm 275 MPa, sib haum rauGB 5310 Qib 20G. Thaum 20G (20 Hlau rau Boiler) muaj cov ntsiab lus carbon zoo sib xws (0.17-0.23%) rau A106-B, nws txoj kev kho cua sov thiab qhov kub siab tshaj plaws yog tsim los ua kom tau raws li qhov xav tau ntawm A106-C. Rau cov raj superheater, 20G yog tus qauv hloov rau A106-C, txawm hais tias A106-C tso cai rau cov ntsiab lus ntawm manganese ntau dua -8.
Q5: Yuav ua li cas Suav tus qauv GB 3087 (Low / Nruab Nrab Siab Boiler Tube) piv rau ASTM A179 (Seamless Cold-Drawn Tsawg-Carbon Steel Heat Exchanger)?
A5:ASTM A179 tshwj xeeb rau cov khoom siv hluav taws xob thiab cov condensers, yuav tsum muaj cov qoob loo tshwj xeeb thiab lub zog tawm ntawm 180 MPa. SuavGB 3087 Qib 10#los yog20#yog siv rau boiler headers thiab chav pipelines. Txawm li cas los xij,GB/T 8163 20#Nws tsis yog qhov sib npaug ncaj qha rau A179 vim tias A179 yuav tsum muaj cov txheej txheem tua (cov hlau deoxidized tag nrho) thiab cov kev txwv nruj dua. Qhov ze tshaj qhov sib npaug mechanical yogGB 3087 20#, tab sis rau qhov tseeb kub exchanger tubing, manufacturers feem ntau sivGB/T 9948 20#(Petroleum cracking) kom phim A179's stringent non-destructive test requirements -8.
