ASTM A671 CF70 Chav Kawm 70 steel kav

1. ASTM A671 CF70 Class 70 yog dab tsi?

Teb:
ASTM A671 yog tus qauv rauhluav taws xob-fusion-welded steel kavtsim los rau atmospheric thiab qis-kev pabcuam kub. CovCF70 Chav Kawm 70npe hais tias:

Khoom Qib:Carbon steel nrog qhov tsawg kawg nkaus tawm lub zog ntawm 70 ksi (483 MPa).

Kev tsim khoom:Cov yeeb nkab yog tsim los ntawm phaj / ntawv thiab longitudinally welded.

Daim ntawv thov:Siv nyob rau hauv qis - qhov kub thiab txias (txog -50℃F/-45℃).

2. Dab tsi yog cov kev cai tshuaj rau CF70 Class 70?

Teb:
Cov ntsiab lus tseem ceeb txwv (wt.% max, tshwj tsis yog tau teev tseg):

Cov pa roj carbon (C): 0.30%

Manganese (Mn): 1.20%

Phosphorus (P): 0.035%

Sulfur (S): 0.035%

Silicon (Si): 0.10–0.35%
Nco tseg:Qhov sib piv Mn/C siab dua ua kom qis -kub toughness.

3. Dab tsi yog cov khoom siv ntawm CF70 Class 70 kav?

Teb:

Tensile zog:80-100 ksi (550-690 MPa)

Yield zog:Ntau dua lossis sib npaug rau 70 ksi (483 MPa)

Elongation:Ntau dua lossis sib npaug li 18% (nws txawv nrog phab ntsa tuab)

Impact Testing:Yuav tsum tau muaj rau Chav Kawm 70 (xws li Charpy V-notch ntawm -50℃F/-45℃).

4. Dab tsi yog kev siv cov kav dej no?

Teb:
Cov kev siv ib txwm muaj xws li:

Tsawg-kub siab cov hlab ntsha(piv txwv li, LNG cia).

Cryogenic pipelineshauv petrochemical cov nroj tsuag.

Cov nroj tsuag muaj zogthiab tub yees tshuab.
Qhov txiaj ntsig tseem ceeb:Weldability thiab toughness ntawm sub-zero kub.

5. ASTM A671 CF70 txawv li cas API 5L lossis ASTM A106 kav?

Teb:

Nyiaj tshwj xeeb:ASTM A671 cov kav dej xav tauKev kuaj hydrostaticthiabtsis yog -kev kuaj xyuas kev puas tsuaj (NDE)raws li tus qauv. Rau qhov luaj li cas / kam rau ua, xa mus rau ASTM A671 Table 3.