Helical-seam carbon steel kav ASTM A139 Qib A, B, C
Mechanical Property
| Qib A | Qib B | Qib C | Qib D | Qib E | |
| Yield zog, min, Mpa (KSI) | 330 (48) hnub | 415 (60) | 415 (60) | 415 (60) | 445(66) |
| Tensile zog, min, Mpa (KSI) | 205(30) | 240(35) | 290 (42) hnub | 315 (46) hnub | 360(52) |
Tshuaj muaj pes tsawg leeg
| Element | Kev sib xyaw, Max,% | ||||
| Qib A | Qib B | Qib C | Qib D | Qib E | |
| Cov pa roj carbon | 0.25 | 0.26 | 0.28 ib | 0.30 Nws | 0.30 Nws |
| Manganese | 1.00 Nws | 1.00 Nws | 1.20 | 1.30 Nws | 1.40 Nws |
| Phosphorus | 0.035 ib | 0.035 ib | 0.035 ib | 0.035 ib | 0.035 ib |
| Sulfur | 0.035 ib | 0.035 ib | 0.035 ib | 0.035 ib | 0.035 ib |
Hydrostatic Test
Txhua qhov ntev ntawm cov yeeb nkab yuav tsum raug kuaj los ntawm cov chaw tsim khoom mus rau lub siab hydrostatic uas yuav tsim nyob rau hauv cov yeeb nkab phab ntsa ib qho kev ntxhov siab tsis pub tsawg tshaj 60% ntawm qhov tsawg kawg nkaus yield zog ntawm chav tsev kub.Lub siab yuav tsum tau txiav txim los ntawm qhov sib npaug hauv qab no:
P = 2st/D
Permissible variations In Weights and Dimensions
Txhua qhov ntev ntawm cov yeeb nkab yuav tsum tau hnyav nyias thiab nws qhov hnyav yuav tsum tsis txhob sib txawv ntau dua 10% tshaj lossis 5.5% raws li nws qhov hnyav, suav nrog nws qhov ntev thiab nws qhov hnyav ntawm ib chav tsev ntev.
Sab nraud txoj kab uas hla yuav tsum tsis txhob sib txawv ntau tshaj ± 1% ntawm lub npe nominal sab nraud txoj kab uas hla.
Phab ntsa thickness ntawm txhua qhov chaw yuav tsum tsis pub ntau tshaj 12.5% raws li cov phab ntsa thickness.
Ntev
Ib qho random ntev: 16 txog 25ft (4.88 txog 7.62m)
Ob chav random ntev: tshaj 25ft txog 35ft (7.62 txog 10.67m)
Uniform lengths: permissible variation ± 1in
Xaus
Cov yeeb nkab yuav tsum tau muab tso rau hauv qhov xaus, thiab cov burrs ntawm qhov kawg yuav raug tshem tawm.
Thaum cov yeeb nkab kawg tau teev tseg rau bevel xaus, lub kaum sab xis yuav tsum yog 30 txog 35 degree
