1. ASTM A671 CJB115 Class 30 Steel Pipe yog dab tsi?
Teb:
ASTM A671 CJB115 Chav Kawm 30 yog asiab -lub zog hluav taws xob- fusion-welded (EFW) carbon steel yeeb nkabtsim rauultra-siab- siab siv kev lag luam(ua haujlwm saum toj no-20 ° F / -29 ° C). Lub npe "Class 30" qhia tias aTsawg tshaj tawm lub zog ntawm 30 ksi (207 MPa), ua rau nws haum rau huab cua siab thiab cov yam ntxwv load tej yam kev mob.
2. Cov khoom tseem ceeb?
Teb:
Mechanical:
Yield zog:Ntau dua lossis sib npaug rau 30 ksi (207 MPa)
Tensile zog:90-110 ksi (621-759 MPa)
Impact Test: Yuav tsum tau siv rau cov ntawv teev npe (piv txwv li, cyclic loading)
Tshuaj muaj pes tsawg leeg:
Cov pa roj carbon (C):Tsawg dua lossis sib npaug li 0.35%
Manganese (Mn):Tsawg dua lossis sib npaug li 1.40%(hloov rau lub zog)
Phosphorus / Sulfur (P / S):Tsawg dua lossis sib npaug li 0.035%
3. Cov ntawv thov zoo li cas?
Teb:
Ultra-siab-siab hydraulic systems(piv txwv li, oilfield khoom)
Fais fab nroj tsuag main steam kab(txog1,000 psi +)
Heavy industrial structural kev txhawb nqa(piv txwv li, offshore platforms)
4. Nws Li Cas Piv rau Chav Kawm 25 thiab Chav Kawm 35?
Teb:
| Chav kawm | Yield zog | Qhov txawv tseem ceeb |
|---|---|---|
| Chav Kawm 25 | 25 ksi (172 MPa) | High -siab tshuab |
| Chav Kawm 30 | 30 ksi (207 MPa) | Ultra-siab-siab/structural |
| Chav Kawm 35 | 35 ksi (241 MPa) | Tshwj xeeb heev - siab |
5. Fabrication & Quality Control?
Teb:
Vuam:Preheat (350-450℃F) yuav tsum +PWHT (Post-Kev kho cua sov)
Kev sim:Hydrostatic (2x tsim siab) + yuav tsum tau UT/RTrau qhov tseem ceeb welds
Kev tsim: Kub khoov nkaus xwbrau hnyav deformations
Kev tshuaj xyuas:Ua raws li tag nrhoASTM A671-26 Cov khoom lag luam, suav nrogkuaj hardness
