1. ASTM A671 CC65 Chav Kawm 72 yog dab tsi?
Teb:
ASTM A671 CC65 Chav Kawm 72 hais txoghluav taws xob-fusion-welded carbon steel kavtsim rauqis- kub thiab siab - kev pabcuam siab(hauv qab-65 ° F / -54 ° C).
TxujASTM A671 (rau atmospheric & cryogenic applications).
Qib CC65: Tswj chemistry (C Tsawg dua lossis sib npaug li 0.30%, sib npaug Mn / Si / P / S).
Chav Kawm 72: QhiaYam tsawg kawg nkaus tawm lub zog ntawm 72 ksi (496 MPa)thiab txhim khu kev ua haujlwm siab.
Qhov Tseem Ceeb: Siab zog dua Chav Kawm 70/71, haum rau kev thov ntau dua 低温 daim ntawv thov.
2. Chav Kawm 72 feem ntau siv nyob qhov twg?
Teb:
Feem ntau hauv kev lag luam xav taucryogenic resilience thiab siab zog:
LNG (Liquefied Natural Gas) pipelines(-162℃kev pabcuam).
Petrochemical nroj tsuag(ethylene, ammonia thauj).
Kev tsim hluav taws xob(txias- huab cua txias tshuab).
Offshore roj & roj(Arctic / subsea pipelines).
3. Dab tsi yog Cov Khoom Siv Tseem Ceeb & Cov Kev Xeem Xeem?
Teb:
Mechanical Properties:
Yield zog:Ntau dua lossis sib npaug rau 72 ksi (496 MPa).
Tensile zog:85-110 ksi (586-758 MPa).
Kev sim cuam tshuam: Charpy V-notch ntawm -65℃F (–54 degree)(tus nqi zog tsawg kawg nkaus rau ASTM A370).
NDT: 100% radiography (RT)los yogKev kuaj ultrasonic (UT)los xyuas kom meej weld kev ncaj ncees (ASTM E164 / E213).
4. Chav Kawm 72 Piv rau Chav Kawm 70/71 li cas?
Teb:
| Parameter | Chav Kawm 72 | Chav Kawm 70/71 |
|---|---|---|
| Yield zog | 72 ksi (496 MPa) | 70-71 ksi (483-490 MPa) |
| Siab Muaj Peev Xwm | Siab dua | Tsawg me ntsis |
| Nqi | ~ 5-10% siab dua | Txuj |
| Nco tseg: Chav Kawm 72 yog nyiam rausiab dua -siabtshuab. |
5. Dab tsi yog Cov Lus Qhia Tseem Ceeb rau Fabrication?
Teb:
Vuam:
Preheat rau200-300 ° F (93-149 ° F).
Sivqis-hydrogen electrodes(e.g. AWS E7018).
Tshaj tawm -Kev kho cua sov (PWHT): Yam yuav tsum tau ua rau kev ntxhov siab (ASME Sec VIII).
Kev tiv thaiv corrosion: FBE (Fusion-Epoxy Bonded)los yog 3LPE coatings rau kev txhoj puab heev ib puag ncig.
