ASTM A333 Qib 8 Tubing
Dec 05, 2025
ASTM A333 Qib 8 LTCS Tubing Description
A333 GR8 yog qhov qis -kub seamless steel yeeb nkab raws li tus qauv ASTM, tshwj xeeb tsim los rau huab cua txias ib puag ncig qis li -196℃. Nws belongs rau 3.5% npib tsib xee series ntawm qis-kub alloy steels. Nws "tsawg carbon, siab npib tsib xee" muaj pes tsawg leeg (cov pa roj carbon tsawg dua lossis sib npaug li 0.19%, nickel ~ 3.5%) ua ke nrog kev kho cua sov kom nruj kom muaj zog tshwj xeeb thiab tiv thaiv kev tawg ntawm qhov kub thiab txias.
Cov khoom tseem ceeb muaj xws li: tensile zog Ntau dua los yog sib npaug rau 415 MPa, yield zog Ntau dua los yog sib npaug rau 240 MPa, elongation Ntau dua los yog sib npaug rau 30%, thiab Charpy cuam tshuam lub zog loj dua los yog sib npaug rau 20J ntawm -46 degree. Nws yog dav siv nyob rau hauv LNG tsheb thauj mus los, cryogenic petrochemical khoom, thiab polar engineering daim ntaub ntawv.
Chemical Compositions (%) ntawm ASTM A333 Qib 8
| Cov khoom xyaw | Cov ntaub ntawv |
|---|---|
| Cov pa roj carbon (max.) | 0.13 |
| Manganese | 0.90 max |
| Phosphorus (max.) | 0.025 |
| Sulfur (max.) | 0.025 |
| Silicon | 0.13-0.32 |
| Nickel | 8.40-9.60 |
| Chromium | … |
| Lwm Yam Khoom | … |
Mechanical zog ntawm ASTM A333 Qib 8
| Cov khoom | PSI (Longitudinal) | MPa (Transverse) |
|---|---|---|
| Tensile zog, min, (MPa) | 100 000 | 690 |
| Yield zog, min, (MPa) | 75 000 | 515 |
| Basic yam tsawg kawg nkaus elongation rau phab ntsa 5/16 nyob rau hauv. [8mm] thiab tshaj nyob rau hauv thickness, strip xeem, thiab rau tag nrho cov me me xeem nyob rau hauv tag nrho seem. | 22 | -- |
| Thaum tus qauv puag ncig 2-hauv, los yog 50-mm gage ntev los yog proportionally me me test specimen nrog lub gage ntev sib npaug rau 4D (4 npaug ntawm txoj kab uas hla) yog siv. | 16 | -- |
| Rau kev ntsuam xyuas sawb, txiav tawm rau txhua 1/32 hauv [0.8 mm] txo cov phab ntsa tuab hauv qab 5/16 hauv [8 mm] los ntawm qhov yooj yim elongation ntawm qhov feem pua ntawm cov hauv qab no | 1.25 | -- |
A333 GR8 VS API 5L
| Cov khoom sib piv | ASTM A333 Gr8 | API 5L |
|---|---|---|
| Hom qauv | Material Standard (xws li tshuaj muaj pes tsawg leeg, mechanical zog) | Product Standard (xws li qhov ntev, kev tsim khoom, tshuaj xyuas cov kab yeeb nkab) |
| Lub Hom Phiaj | Tsawg heev - qhov kub thiab txias (piv txwv li, -196℃LNG cia) | Roj thiab roj tsheb thauj mus los |
| Cov ntsiab lus tseem ceeb | Tsawg-kub toughness (piv txwv li, cuam tshuam lub zog ntawm -195 degree) | Lub zog, toughness, weldability, corrosion kuj |
| Yam khoom siv | A333 Qib 8 (~ 3.5% nickel) | X42, X52, X70, thiab lwm yam (carbon-manganese steels) |
| Kev tsim khoom | Yuav tsum tau normalizing kev kho mob kom zoo zoo grain qauv | Kub dov, txias dov, kho cua sov, thiab lwm yam. |
| Daim ntawv thov Scenario | LNG cia tso tsheb hlau luam, cryogenic piping, polar engineering | Onshore / offshore roj thiab roj xa mus kav |
Kev tshuaj xyuas thiab kuaj:
Kev tshuaj ntsuam xyuas cov tshuaj lom neeg, Kev Ntsuas Cov Khoom Siv Hluav Taws Xob (Tensile Strength, Yield Strength, elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test, Tsis muaj -Kev kuaj kev puas tsuaj, Hydrostatic Test.
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