ASTM A333 Qib 6 qis -kub steel yeeb nkab yog dab tsi?
ASTM A333 yog tus qauv rau seamless thiab welded steel kav haum rau qhov kub thiab txias, tawm los ntawm American Society for Testing and Materials. Ntawm lawv, Qib 6 yog qib siv ntau tshaj plaws, yog cov pa roj carbon-manganese-silicon series ntawm qis- kub steel. Nws cov yam ntxwv tseem ceeb yog:
- Yuav tsum tau qis- ntsuas qhov kub thiab txias: Txhua pawg ntawm cov ntaub ntawv yuav tsum dhau Schaefer V- ntsuas qhov ntsuas qhov ntsuas ntawm -46℃(-50℃F).
- Kev kho cov qoob loo zoo: Los ntawm kev ua kom tiav deoxidation nrog txhuas lossis silicon (rau cov hlau txias), xyuas kom meej tias cov qoob loo ncav cuag ASTM 5 qib lossis finer.
- Cov txheej txheem tsim khoom xaiv tau: Cov khoom tuaj yeem tsim los ntawm cov txheej txheem seamless lossis los ntawm cov txheej txheem welded.
Tsis zoo li cov pa roj carbon zoo tib yam cov kav dej (xws li ASTM A106 Gr.B), A333 Gr.6 tshwj xeeb tsim los rau qis- qhov kub thiab txias tsis tuaj yeem hloov tau yooj yim. Hloov pauv, A333 Gr.6 kuj tsis haum rau siab - qhov kub thiab txias.
Tshuaj muaj pes tsawg leeg: Tsawg phosphorus thiab sulfur tsim kom ntseeg tau tias qis -kub toughness
Cov tshuaj muaj pes tsawg leeg ntawm ASTM A333 Qib 6 tau ua tib zoo tsim los xyuas kom meej tias nws cuam tshuam rau qhov kub thiab txias. Piv nrog rau cov pa roj carbon zoo tib yam, A333 Gr.6 txwv nruj dua ntawm ob "cov ntsiab lus tsis zoo" - phosphorus (P) thiab sulfur (S) - vim lawv txo qis qis -kub toughness.
Table 1 - Tshuaj muaj pes tsawg leeg ntawm ASTM A333 Qib 6 Yeeb Nkab (Kev Ntsuas Kub, wt.%)
| Element | Qhov yuav tsum tau muaj (wt.%) |
|---|---|
| Cov pa roj carbon (C) | Tsawg dua los yog sib npaug li 0.30 |
| Manganese (Mn) | 0.29 – 1.06 |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025 |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.025 |
| Silicon (Si) | Ntau dua lossis sib npaug li 0.10 |
Nco tseg:
- Cov hlau yuav tsum raug tua tag nrho (tag nrho deoxidized) siv silicon thiab / lossis txhuas.
- Cov qoob loo loj yuav yog ASTM Tsis yog . 5 lossis finer.
- Rau kev tshuaj xyuas cov khoom, kev tso cai hloov pauv los ntawm cov kev txwv ntsuas kub ntsuas yuav tsum ua raws li ASTM A333 Table 2.
Mechanical zog: Txhim khu kev ntseeg tau ntawm lub zog thiab plasticity
Ntawm qhov kub ntawm -46 degree, cov khoom siv A333 Gr.6 tsis tsuas yog tuav lub zog txaus tab sis kuj muaj peev xwm ua tau zoo heev ntawm cov yas deformation.
Table 2 – Mechanical Properties of ASTM A333 Qib 6 Pipe
| Khoom | Yuav tsum tau (min) |
|---|---|
| Tensile zog (Rm) | 415 MPa (60,000 psi) |
| Yield Strength (Rt₀.₅) | 240 MPa (35,000 psi) |
| Elongation (longitudinal, 50 hli ntsuas) | 30% |
| Hardness (max, raug) | 197 HWB |
Tus nqi tiag tiag (raws li peb cov ntaub ntawv tsim khoom):
- Tawm Zog: 260 - 330 MPa
- Tensile zog: 440 - 520 MPa
- Elongation: 32-38%
Tsawg- qhov kub thiab txias cuam tshuam toughness: Core lav ntawm -46℃(yuav tsum tau tshuaj xyuas yam khoom)
Impact toughness yog qhov tseem ceeb tshaj qhov sib txawv ntawm ASTM A333 Qib 6 thiab cov pa roj carbon zoo tib yam. Txhua batch ntawm A333 Gr.6 steel kav yuav tsum dhau qhov -46℃Schaeffler V-notch cuam tshuam kev xeem.
Table 3 – Charpy V-Ntch Impact Requirements rau ASTM A333 Qib 6
| Parameter | Kev xav tau |
|---|---|
| Kev ntsuas kub | -46℃(-50℃F) lossis qis dua |
| Specimen Orientation | Ntev |
| Yam tsawg kawg nruab nrab zog (3 qauv) | 18 J (13 ft - lbs) |
| Yam tsawg kawg nkaus Ib Cov Qauv Zog | 14 J (10 ft{2}}lbs) |
Impact Test Notes:
- Rau cov kav dej me me uas puv - qhov loj (10 mm × 10 mm) tsis tuaj yeem coj mus kuaj, sub- cov qauv me me nrog cov nqi qis zog tau tso cai.
- Qhov ntsuas kub yuav tsum tau pom zoo los ntawm cov chaw tsim khoom thiab cov neeg yuav khoom yog tias qhov ntsuas kub qis dua -46℃tau teev tseg.
- Tag nrho cov cua sov ntawm A333 Qib 6 yeeb nkab yogyuav tsum raug kuaj- Qhov no tsis yog ib qho kev xaiv ntxiv uas yuav tsum tau muaj
PSL 1 vs. PSL 2: Qhov sib txawv ntawm ob qib khoom
Hauv ASTM A333 tus qauv, ob qib khoom, PSL 1 thiab PSL 2, kuj txawv. Cov tom kawg muaj cov kev cai nruj dua.
| Parameter | PSL 1 | PSL 2 |
|---|---|---|
| Tshuaj txwv | Txuj | Kev txwv ntau dua (qis C, P, S) |
| Lub zog tensile | Yam tsawg kawg nkaus xwb | Yam tsawg kawg + siab kawg |
| Yield zog | Yam tsawg kawg nkaus xwb | Yam tsawg kawg + siab kawg |
| Impact toughness | Yuav tsum tau ntawm -46 degree | Yuav tsum tau ntawm -46℃(tib yam nqi) |
| NDE (tsis yog -kev kuaj xyuas kev puas tsuaj) | Xaiv tau | Yuav tsum tau |
| Traceability | Basic (kub tus naj npawb) | Full (kub + yeeb nkab theem) |
| Tej daim ntawv thov | General low -kev pabcuam kub | Kev pabcuam tseem ceeb, offshore, kev pabcuam qaub |
Kev pom zoo:Rau offshore platforms, qaub kev pab cuam (H₂S), los yog tseem ceeb heev uas tsis muaj -kub daim ntawv thov, qhia meejASTM A333 Qib 6 PSL 2.
Qhov ntau thiab tsawg thiab phab ntsa thickness qib
ASTM A333 Qib 6 steel kav muaj qhov loj me ntawm DN6 (1/8 ") rau DN1200 (48"), nrog phab ntsa thicknesses npog Schedule 10 mus rau Teem caij 160 nrog rau STD, XS, thiab XXS.
Table 4 - Qhov Loj Loj rau ASTM A333 Gr . 6 Seamless / Welded Yeeb Nkab
| NPS (hauv) | Sab nraud txoj kab uas hla (mm) | Teem caij 40 (mm) | Teem caij 80 (mm) | Teem caij 160 (mm) | XXS (mm) |
|---|---|---|---|---|---|
| 1/2 | 21.3 | 2.77 | 3.73 | 4.75 | 7.47 |
| 2 | 60.3 | 3.91 | 5.54 | 8.74 | 11.07 |
| 6 | 168.3 | 7.11 | 10.97 | 18.26 | 21.95 |
| 12 | 323.8 | 10.31 | 17.48 | 33.32 | - |
Ntev Options:
Random ntev: 5 - 7 meters (ib zaug random) / 9 - 13 meters (ob chav random)
Tsau ntev: 6 m, 12 m, lossis raws li tau teev tseg
Xaus Finishes:
Plain kawg (PE)
Beveled kawg (BE) - tus qauv rau pob tw- vuam
Kev kho cua sov thiab kev xa khoom
ASTM A333 tus qauv tau teev tseg tias tag nrho Qib 6 steel kav yuav tsum tau ua tiav kev kho cua sov kom ntseeg tau tias qhov sib xws ntawm qhov qis -kub toughness.
| Kev Xa Khoom | Kev piav qhia | Kev siv tau |
|---|---|---|
| Normalized (N) | Heated saum toj no transformation kub, cua txias | Feem ntau siv rau seamless yeeb nkab |
| Quenched thiab Tempered (QT) | Dej quenched + tempering | Rau kev txhim kho toughness lossis hnyav phab ntsa |
| Kev ntxhov siab (SR) | Subcritical annealing | Rau txias- kos seamless lossis welded yeeb nkab tom qab tsim |
Nco tseg:Tsis zoo li ASTM A106 Qib B uas tuaj yeem muab "raws li-kub-tiav" yam tsis muaj kev kho cua sov,A333 Qib 6 ib txwm xav tau kev kho cua sov(normalized los yog QT) los txhim kho qhov ntsuas qis -kub qhov cuam tshuam
Seamless vs. Welding: Yuav xaiv li cas?
ASTM A333 Qib 6 tso cai rau kev tsim khoom los ntawm txoj kev seamless lossis welded.
| Yam | Seamless (SMLS) | Welded (EFW / ERW) |
|---|---|---|
| Qhov ntau thiab tsawg | 1/8″ – 36″ | 6″ – 48″ |
| Kev ntsuas siab | Siab dua (tsis muaj seam) | Standard (seam zog yam siv tau) |
| Nqi | Siab dua | Lower (rau loj diameters) |
| Muaj | Dav dav | Txwv rau qhov loj dua |
| Tej kev siv | Siab - cov kab hluav taws xob siab, qhov me me | Loj - txoj kab uas hla qis - cov kab siab |
Kev pom zoo:Rausiab -siablos yogme txoj kab uas hla (< 6″) applications, use seamless. Rauloj txoj kab uas hla (>12 ″) nrog cov txheej txheem siab,weldedyog kev lag luam ntau dua.
Cov yeeb nkab fittings thiab flanges: A420 WPL6 / A350 LF2
Thaum koj xaiv ASTM A333 Qib 6 cov kav dej, cov kav dej sib txuas thiab cov flanges kuj yuav tsum tau ua los ntawm cov khoom ntawm tib qib tsim nyog rau qhov kub thiab txias.
| Cheebtsam | Pom zoo Specification |
|---|---|
| Butt-weld Fittings (lub luj tshib, tees, thiab lwm yam) | ASTM A420 Qib WPL6 |
| Forged Fittings & Flanges (Flanges, forged yeeb nkab fittings) | ASTM A350 Qib LF2 |
Kev siv cov khoom siv tsis sib xws (xws li A234 WPB lossis A105) yuav ua rau muaj kev pheej hmoo ntawm kev puas tsuaj rau tag nrho cov kav dej ntawm qhov kub thiab txias.
Tej yam kev thov scenarios
ASTM A333 Qib 6 qis-kub carbon steel yeeb nkab tau dav siv hauv cov haujlwm hauv qab no: ASTM A333 Qib 6 qis-kub carbon steel yeeb nkab tau dav siv hauv cov haujlwm hauv qab no:
- Liquefied Natural Gas (LNG) tau txais chaw nres tsheb thiab liquefaction cog: LNG cov kav dej thauj mus los (-162℃yuav tsum muaj cov ntaub ntawv tshwj xeeb, tab sis cov kav dej txuas ntxiv siv Gr.6)
- Tsawg-cov kav dej kub txheej txheem hauv kev lag luam petrochemical: kev thauj mus los ntawm tsawg-kub xov xwm xws li ethylene, propylene, thiab propane
- Cua Separation Unit (ASU): Cov kav xa dej rau thauj cov pa oxygen, kua nitrogen, thiab kua argon (Faj seeb: Cov pa oxygen yuav tsum nruj me ntsis degreased)
- Kev txhim kho roj thiab roj hauv thaj chaw txias: kev sib sau ua ke thiab kev thauj mus los hauv qhov siab - thaj chaw siab xws li Arctic Circle thiab Siberia
- Cov tub yees txias thiab cia txias: Ammonia thiab Freon tub yees cov kav dej ntawm cov chaw ua haujlwm tub yees
- Lub tshuab hluav taws xob siab (Blowdown): Ib lub raj xa dej uas tso cai rau cov pa tawm sai sai ua rau qhov kub thiab txias.
Vim li cas thiaj xaiv peb cov khoom ntawm ASTM A333 Gr.6 qis-cov kav dej kub?
leej twg xaiv peb?
✅ Tag nrho - qhov loj me: 1/8 "- 48" seamless / welded xaiv muaj, Sch 10 - Sch 160, STD, XS, XXS
✅ 100% qis- ntsuas qhov kub thiab txias: A -46℃Schaeffler cov ntaub ntawv cuam tshuam tau muab rau txhua pawg.
✅ Traceability lav: Txhua cov yeeb nkab steel yog cim nrog rau tus lej ntawm lub tshuab hluav taws xob thiab tau ua tiav EN 10204 3.1 ntawv pov thawj.
✅ Thib peb-kev lees paub lees paub: SGS, BV, TUV, DNV, ABS
✅ Cov Kev Pabcuam Ntxiv: A420 WPL6 yeeb nkab fittings thiab A350 LF2 flanges tuaj yeem muab tau ib txhij.
ib - nres kev daws teeb meem
pab neeg tshaj lij
siab zoo
Yog tias koj tab tom nrhiav rau ASTM A333 Qib 6 qis-kub carbon steel kav rau koj qhov project, thov muab cov ntaub ntawv hauv qab no kom peb tuaj yeem muab cov lus qhia ceev rau koj:
- Nominal size (NPS) lossis sab nraud (OD)
- Phab ntsa thickness (Tshooj los yog hli)
- Qib khoom (PSL 1 / PSL 2)
- Ib lub hauv paus ntev (m) thiab tag nrho qhov xav tau kom muaj nuj nqis
- Hom kawg (pav kawg / bevel kawg)
- Kev xa khoom raws li txoj cai (normalizing / quenching + tempering)
- Yuav tsum tau ntawv pov thawj (3.1 / 3.2)
