ASTM A333 Qib 6 Carbon Steel Pipes
Dec 04, 2025
ASTM A333 Qib 6 Carbon Steel Seamless Pipes Nqe lus piav qhia
A333 Gr.6 Tsawg-Tub Yeeb Yeeb yog seamless steel yeeb nkab rau qis - kev pabcuam kub ua raws li ASTM A333 / ASME SA333 tus qauv. Nws yog feem ntau siv hauvpetrochemical khoom(xws li reactors, heat exchangers, separators),natural gas processing, thiabKev tsim khoom siv cryogenicrau ib puag ncig xws li-45℃rau -195 degree. Common specifications muaj xws li ib tugsab nraud txoj kab uas hla ntawm 21.3-762 mmthiab aphab ntsa thickness ntawm 2.0-140 mm, ua los ntawmkub- dov, txias- rub, lossis kub- nthuav dav cov txheej txheem. Qhov kev xa khoom xav taunormalization kub kho ntawm 900℃-930 degree.
A333 Qib 6 Pipes specification
Kev kho cua sov xav tau rau A333 Qib 6 Cov kav dej
| Kev sib xyaw,% | |||
| Element | Qib 1 | Qib 3 | Qib 6 |
| Carbon, max | 0.30 | 0.19 | 0.30 |
| Manganese | 0.40 – 1.06 | 0.31 – 0.64 | 0.29 – 1.06 |
| Phosphorus, max | 0.025 | 0.025 | 0.025 |
| Sulfur, max | 0.025 | 0.025 | 0.025 |
| Silicon | - | 0.18 -0.37 | 0.10 min |
| Nickel | - | 3.18 – 3.82 |
Tensile Requirements rau ASTM A333 Qib 6 Pipes
| Qib 6 | |||
| MPa | psi | MPa | |
| Tensile zog, min | 450 | 60,000 | 415 |
| Yield zog, min | 240 | 35,000 | 240 |
| Hloov | Ntev | Hloov | |
| Elongation nyob rau hauv 2 nti los yog 50 hli, (los yog 4D), min, %: | |||
| Basic yam tsawg kawg nkaus elongation rau phab ntsa 5/16 nyob rau hauv. [8 mm] thiab tshaj nyob rau hauv thickness, strip xeem, thiab rau tag nrho cov me me uas tau kuaj nyob rau hauv tag nrho cov seem | 20 | 30 | 16.5 |
| 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 | 14 | 22 | 12 |
| Rau kev ntsuam xyuas strip, txiav tawm rau txhua 1/32in. [0.8 mm] txo cov phab ntsa thickness hauv qab 5/16 nyob rau hauv. [8 mm] los ntawm qhov yooj yim yam tsawg kawg nkaus elongation ntawm cov feem pua nram qab no | 1.00 | 1.50 | 1.00 |
| Elongation hauv 2 nti lossis 50 mm, min, %: | |||
A333 Gr.6 vs A106 Gr.B Sib piv Table
| Parameter | ASTM A333 Gr.6 | ASTM A106 Gr.B |
|---|---|---|
| Txheem Scope | -45℃Cryogenic Piping | Carbon Steel Pipe rau Tsawg dua lossis sib npaug li 425 degree |
| Ntsiab Alloy | Ni-Ntau zog(Ni: 3.2–3.6%) | C-Mn Steel(C Tsawg dua lossis sib npaug rau 0.30%, Mn: 0.29–1.06%) |
| Qhov kub thiab txias | -45℃~ +50 degree | -29℃~ +425 degree |
| Mechanical Focus | Ntau dua lossis sib npaug rau 18J @ -45℃Charpy Impact | Tensile Strength Ntau dua lossis sib npaug rau 415 MPa (RT) |
| Yuav tsum xeem | Cryogenic Charpy Impact Test | Tensile Test + Hydro Test nkaus xwb |
| Failure Risk | Accelerated Oxidation >+50 degree | Brittle Fracture<-29°C |
| Microstructure | Ni-Stabilized Austenite + Fine Ferrite | Ferrite + Pearlite (Tsis muaj LT Phase Hloov) |
| Daim ntawv thov | • LNG Secondary Pipelines (-45 ~ -100 degree) • Liquid Ammonia Spray Pipes |
• 350℃Chav Hloov • Boiler Feed Pipes • General O&G Pipelines |
| Tus nqi siv | ≈2.5× A106(High Ni Nqi) | Tus nqi pib |
| Vuam Compatibility | Yuav tsum muaj Ni-raws li Electrodes (piv txwv li, ENiCrFe-3) | Txheem Carbon Steel Electrodes (piv txwv li, E7018) |
Application Scenarios thiab Comparative Advantages
Liquefied Natural Gas (LNG) Pipelines:
LNG hloov ntawm-162 degreexav tau cov ntaub ntawv nrogultra-tsis tshua muaj kub toughness. A333 Gr.6 feem ntau yog siv rauvalve txuas cov kav dejhauvthib ob cryogenic seem (-45℃rau -100 degree).
Cov khoom siv tshuaj ua haujlwm:
Cov ntawv thov xws liammonia synthesis yeesthiabethylene txias thawv, uas yuav tsum tau tiv tausob qhov kev sib tw ntawm media corrosion thiab cryogenic kev nyuaj siab.
Qhov zoo tshaj cov ntaub ntawv zoo sib xws:
Piv rau counterparts xws liA333 Gr.3, Gr.6 exhibits≈30% zoo dua qis -kub kev ua haujlwmvim nwsnickel ntau dua (0.40–0.70%),txawm a15-20% tus nqi them nqi.
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