Basic Temperature Range of Carbon Steel Pipes
Carbon steel kav yog hlau conduits feem ntau muaj hlau thiab carbon, nrog rau lawv kub applicability cuam tshuam los ntawm cov khoom muaj pes tsawg leeg, manufacturing txheej txheem, thiab kev pab cuam ib puag ncig. Raws li cov qauv thoob ntiaj teb xws liASTM A106 / A53, qhov dav dav kev nyab xeeb kev ua haujlwm kub ntau rau cov pa roj carbon steel kav yog-29℃rau 425 degree.
1. Tsawg-Tsub Limit (-29 degree)
Hauv qab no-29 degree, lub toughness ntawm carbon steel ho txo qis, ua rau nws nkig tawg. Cov kav dej uas hlaqis- ntsuas qhov kub thiab txias (e.g., ASTM A333 Qib 6) yuav tsum tau siv.
2. Siab -Tsub Limit (425 degree)
Saum toj no425 degree, covoxidation tsis kamthiabzogntawm carbon steel degrade sharply. Ntev raug rau qhov kub thiab txias yuav ua raucreep deformation. Rau siab - qhov kub thiab txias,chromium{0}}molybdenum alloy steels (e.g., ASTM A335 P11) raug pom zoo.
II. Kev cuam tshuam ntawm qhov kub thiab txias ntawm Carbon Steel Pipe Performance
1. Mechanical Property Hloov
Siab -Tsuas Kub: Siab kub txoyield zogthiabtensile zog. Piv txwv li,20 # carbon hlauexperiences ib~ 15% poob rau hauv tensile zog ntawm 300 degree(ibASME B31.3).
Tsawg-Tsuas Kub: Tsis tshua muaj kub yuav ua rau embrittlement, yuav tsum tau validation ntawmCharpy V-cov kev ntsuas cuam tshuam (e.g., Ntau dua lossis sib npaug rau 27J ntawm -46 degree).
2. Corrosion Resistance Variations
Siab -Tsub: Accelerated oxidation saum toj no425 degreetsim nyogaluminizing los yog galvanizingrau kev tiv thaiv nto.
Tsawg- Kub: Condensation tuaj yeem ua rauelectrochemical corrosion, xavrwb thaiv tsev los yog txheej txhim khu kev qha.
III. Daim Ntawv Thov Tshwj Xeeb Scenarios
Boilers & Siab Piping:Pr ibASME cov qauv, carbon steel yeeb nkab nyob rau hauv siab -siab chav tshuab yuav zam tauluv-lub sij hawm kub txog li 450 degree, masphab ntsa tsis tu ncua -kev tshuaj ntsuam xyuasyog yuav tsum tau.
Cryogenic Cia / Thauj: Rauultra-qis- daim ntawv thov kub (piv txwv li, LNG ntawm -162 degree), austenitic stainless hlaulos yognickel{0}}raws li alloysyuav tsum tau, nrog carbon steel txwv rauSecondary rwb thaiv tsev txhawb cov qauv.
IV. Cov txheej txheem xaiv cov khoom siv & ceev faj
Tsim Redundancy: Reserve ib10-20% kub kev nyab xeeb marginhauv kev xaiv tiag.
Standard References: Ua ntejkub- cov lus ntsuas ntsuashauv cov qauv zoo liASTM A106 1thiabGB/T 8163(saib piv txwv hauv qab no).
| Txuj No. | Qhov kub thiab txias | Sau ntawv |
|---|---|---|
| ASTM A106 1 | -29℃rau 425 degree | Seamless yeeb nkab, siab -kev pabcuam kub |
| GB/T 3091 | -15℃rau 350 degree | Welded yeeb nkab, qis -kua kua conveyance |
Tiv tauj peb uas tsis tshua muaj kub carbon yeeb nkab