1. Decoding lub npe "St35.8"
Lub npe "St35.8" ua raws li tus qauv German / DIN (DIN 17175), uas yog dav siv thoob ntiaj teb rau boiler thiab siab hlab ntsha. Cia peb dissect nws:
St: Sawv rau "Stahl" (German rau "Steel").
35: Sawv cev rauyam tsawg kawg nkaus yield zog(Rp0.2) ntawm cov khoom ntawm chav tsev kub. Hauv qhov no, 35 txhais raukwv yees li 355 MPa(los yog 35.5 kgf / mm²). Qhov no yog ib qho cuab yeej cuab tam tseem ceeb qhia txog kev ntxhov siab uas cov khoom pib deform plastically.
8: Qhov no yog tus lej ntsuas qhov zoo uas cuam tshuam nroglong -kev coj cwj pwmntawm cov hlau ntawm qhov kub siab. Nws qhia txog qhovyam tsawg kawg nkaus creep rupture zogtshaj 100,000 teev (tshaj 11 xyoos) ntawm qhov kub thiab txias. Rau St35.8, qhov ntsuas kub no feem ntau nyob ib puag ncig 450-500 degree.
Yog li, hauv cov ntsiab lus yooj yim,St35.8 yog qib carbon steel tau lees tias muaj qhov tsawg kawg nkaus tawm lub zog ntawm ~ 355 MPa thiab tau lees paub los ua haujlwm nyob rau hauv siab thiab kub rau lub sijhawm ntev.
2. Cov Khoom Siv Khoom (Chemical Properties)
St35.8 yog ib qho qis - carbon steel. Ib qho tshuaj muaj pes tsawg leeg yog:
| Element | Cov ntsiab lus (%) |
|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.17% |
| Manganese (Mn) | 0.40 - 0.80 % |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025% |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.025% |
| Silicon (Si) | 0.10 - 0.35 % |
Cov ntsiab lus tseem ceeb ntawm Composition:
Cov ntsiab lus qis carbon:Qhov no muab zoo weldability thiab formability tab sis txwv lub siab tshaj plaws hardness thiab lub zog uas yuav ua tau tiav.
Tsawg Phosphorus thiab Sulfur:Cov no yog tswj kom tsawg los txhim kho toughness thiab weldability.
Tsis muaj qhov tseem ceeb Alloying:Nws tsis muaj qhov tseem ceeb ntawm chromium, molybdenum, lossis npib tsib xee. Qhov no ua rau nws tsis haum rau qhov kub thiab txias heev los yog corrosive ib puag ncig tab sis ua rau tus nqi qis dua.
3. Cov yam ntxwv tseem ceeb & Vim li cas nws thiaj siv rau boilers
Siab -Tsub Muaj Zog:Nws lub ntsiab feature yog lub peev xwm los tuav lub zog ntawm qhov kub thiab txias ntawm boilers thiab superheaters (feem ntau mus txog ~ 450 degree).
Zoo Creep Resistance:Qhov "8" zoo Performance index ua kom nws muaj peev xwm tiv taus qhov kev ntxhov siab tas li ntawm qhov kub thiab txias yam tsis muaj deformation ntau dhau lub sij hawm (creep).
Weldability zoo heev:Cov ntsiab lus carbon tsawg ua rau nws yooj yim heev rau vuam siv txhua txoj hauv kev yam tsis muaj ua ntej - lossis tshaj tawm - vuam kev kho cua sov feem ntau.
Formability zoo:Nws tuaj yeem khoov thiab tsim rau hauv ntau yam duab uas xav tau rau lub tshuab boiler tubing.
Tus nqi -zoo:Raws li cov pa roj carbon steel, nws muaj kev lag luam ntau dua li cov hlau alloy xws li T11, T12, T22, lossis T91, uas yog siv rau qhov kub thiab txias dua.
4. Kev siv ntau
Boiler Tubes:Rau ob qho tib si dej - raj thiab hluav taws - raj boilers.
Superheater Tubes(hauv qis- qhov kub thiab txias).
Economizer Tubes.
Chav Piping(rau saturated thiab qis -kub superheated chav).
Siab Vessel Piping.
Thaum tshav kub kub Exchanger Tubes.
5. Cov qib sib npaug hauv lwm cov qauv
St35.8 yog qhov ua tau zoo sib npaug rau ntau lwm cov qhab nia thoob ntiaj teb lees paub. Qhov sib npaug tshaj plaws yog:
| Txuj | Qib sib npaug | Nco tseg |
|---|---|---|
| ISO | P235GH | Qhov sib npaug thoob ntiaj teb feem ntau. |
| EN (Tebchaws Europe) | 1.0345 | Niaj hnub nimno European khoom naj npawb. |
| ASTM (USA) | A192 / A210 Qib A1 | A192 yog rau siab - siab boiler raj, A210 rau seamless nruab nrab - carbon. |
| JIS (Nyiv) | SWB 410 | |
| GB (Tuam Tshoj) | 20G | Ib qho sib npaug Suav heev. |
Nco tseg:Thaum cov qib no zoo sib xws, tuaj yeem muaj qhov txawv me ntsis ntawm cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab. Nco ntsoov sab laj tus qauv tshwj xeeb thaum qhia cov ntaub ntawv rau daim ntawv thov tseem ceeb.
6. Muaj Cov Qauv thiab Cov Lus Qhia Tshwj Xeeb
St35.8 boiler kav yuav luag ib txwm muab raws liSeamless yeeb nkab (SMLS)kom muaj kev ncaj ncees nyob rau hauv siab. Lawv raug tsim los rau cov qauv xws li:
TIAB SA 17175(Native standard)
TS EN 10216-2(cov qauv European niaj hnub rau lub hom phiaj siab)
Lawv muaj nyob rau hauv ib tug ntau yam ntawm sab nraud diameters (OD) thiab phab ntsa thicknesses (WT), txhais los ntawm lub sij hawm (xws li, SCH 40, SCH 80) los yog ncaj qha qhov ntev.
Cov ntsiab lus
St35.8 Carbon Steel Boiler Yeeb Nkabyog ib qho kev txhim khu kev qha, tus nqi- zoo, thiab siv dav siv rau kev tsim cov khoom siv siab hauv boiler systems uas qhov kub tsis tshaj li ntawm 450℃. Nws lub zog tseem ceeb yog nws tau lees paub ntev -lub sij hawm siab- qhov kub thiab txias kev ua haujlwm zoo, ua rau nws yog ib qho tseem ceeb hauv lub tsev thaiv hauv thermal fais fab nroj tsuag thiab cov tshuab cua sov.
