1. ASTM A671 CJE115 11-sinf po'lat quvur nima?
Javob:
ASTM A671 CJE115 11-sinf akriyojenik-darajali elektr-fusion-payvandlangan (EFW) karbonli po‘lat quvuruchun mo'ljallanganpast-harorat xizmati(ish harorati-55 F/-48 darajadan kamroq yoki unga teng). "11-sinf" belgisi aminimal oqish quvvati 11 ksi (76 MPa), noldan past-ilovalar uchun quvvat va egiluvchanlikni muvozanatlash.
2. Asosiy material xossalari?
Javob:
Mexanik:
Hosildorlik kuchi:11 ksi dan katta yoki unga teng (76 MPa)
Mustahkamlik chegarasi:65–85 ksi (448–586 MPa)
Ta'sir testi:Majburiy Charpy V-teshik -55 F/-48 daraja
Kimyoviy:
Uglerod (C):0,22% dan kam yoki unga teng(kriogen qattiqlik uchun past uglerod)
Marganets (Mn):0.70–1.40%(past-T unumdorligi uchun optimallashtirilgan)
P/S: 0,020% dan kam yoki unga teng(qattiq nopoklik nazorati)
3. Odatdagi ilovalar?
Javob:
LNG (suyultirilgan gaz) uzatish quvurlari
Kriogen saqlash idishlari
Past haroratli kimyoviy ishlov berish.-
Kosmik kemaning suyuq kislorod tizimlari
4. 10-sinf va 15-sinf bilan qanday taqqoslanadi?
Javob:
| Sinf | Hosildorlik kuchi | Xizmat harorati |
|---|---|---|
| 10-sinf | 10 ksi (69 MPa) | -50 darajadan katta yoki unga teng (-46 daraja) |
| 11-sinf | 11 ksi (76 MPa) | -55 darajadan katta yoki unga teng (-48 daraja) |
| 15-sinf | 15 ksi (103 MPa) | -20 darajadan katta yoki unga teng (-29 daraja) |
5. Ishlab chiqarish va sertifikatlash?
Javob:
Payvandlash:
Oldindan qizdirish:225 daraja F min. + PWHT(1150–1250 daraja F)
To'ldiruvchi metall:AWS A5.28 ER90S-G
Sinov:
Gidrostatik:1,75x dizayn bosimi
100% rentgenografiya (RT) + zarba sinovi
Sertifikatlash: ASTM A671 + ASME B31.3
