Dab tsi yog qhov txawv ntawm ASTM A671 thiab ASTM A672?
1. Cov lus txhais lus tseem ceeb
ASTM A671 Cov Lus Qhia Tshwj Xeeb:
Standard rauHluav taws xob-Fusion-Welded Steel Yeeb Nkab rau Atmospheric thiab Kub Kub Kev Pabcuam(EFW tube). Tsim los rauCryogenic kua kis tau tus mob(-196℃rau +50 degree), xws li LNG/kua nitrogen. Yuav tsum tautom qab-weld kub khothiab-45℃Charpy cuam tshuam toughness(piv txwv li, Ntau dua lossis sib npaug rau 27J rau qib CL22). NtxivA252 GR3(cov qauv pawg nrog cov txiaj ntsig ntau dua lossis sib npaug ntawm 310MPa) hauv daim ntawv thov.
ASTM A672 Cov Lus Qhia Tshwj Xeeb:
Standard rauHluav taws xob-Fusion-Welded Steel Yeeb Nkab rau Siab-Kev Pabcuam Siab ntawm Cov Kub Kub Kub(EFW + HT yeeb nkab). Muaj feem xyuam rauhigh -siab tshuab(-29℃rau +343℃), suav nrog cov kav dej / tshuaj. Txhua cov kav dej xav tauKev kho cua sov ("HT" suffix)rau seem stability nyob rau hauv siab.
2. Cov kev sib txawv tseem ceeb
A671 Prioritizes Tsawg-Tsub Toughness:
Kev tswj tshuaj lom neeg (C Tsawg dua lossis sib npaug li 0.25%, P Tsawg dua lossis sib npaug rau 0.035%, S Tsawg dua lossis sib npaug li 0.035%) thiab cov qauv microstructure normalized ua kom tawg tsis kam ntawm -196℃(LNG cov xwm txheej). Siv3LPE tiv thaiv -corrosion txheej(hloov kho dua los ntawm 3PE sib tham rau A252 GR3).
A672 tsom mus rau siab -Tsub muaj zog:
Creep kuj tsim rau chav kav dej (piv txwv li, 540℃/ 8.5MPa). Tso siab raucov ntaub ntawv alloy(piv txwv li, Inconel) es tsis txhob siv cov txheej txheem sab nraud.
3. Cov ntawv thov sib txawv
A671 Dominates Cryogenic Scenarios:
LNG terminals (piv txwv li, Jiangsu Rudong LNG project) thiab kua nitrogen tso tsheb hlau luam, qhov twg A252 GR3 pawg yuav ua tsis tiav vim tawg tawg.
A672 Ua haujlwm siab -Pressure Systems:
Fais fab nroj tsuag chav kab (piv txwv li, Peb Gorges Dam) thiab tshuaj reactors, sib txawv hauv paus ntawm A252 cov txheej txheem siv pawg.
Lub zog ntawm ASTM A671
| Qib | Yield zog (N / mm2) | Tensile Properties (N/mm2) | Elongation (%) | Vuam taw tes tensile zog (N / mm2) |
|---|---|---|---|---|
| -/A45 | -/165 | -/310~450 | -/30 | -/310~450 |
| -/A50 | -/185 | -/345~485 | -/28 | -/345~485 |
| CA55/A55 | 205 | 380~515 | 27 | 380~515 |
| -/B55 | -/205 | -/380~515 | -/27 | -/380~515 |
| CB60/B60 | 220 | 415~550 | 25 | 415~550 |
| CB65/B65 | 240 | 450~585 | 23 | 450~585 |
| CB70/C70 | 260 | 485~620 | 21 | 485~620 |
| -/C55 | -/205 | -/380~515 | -/27 | -/380~515 |
| CC60/C60 | 220 | 415~550 | 25 | 415~550 |
| CC65/C65 | 240 | 450~585 | 23 | 450~585 |
| CC70/C70 | 260 | 485~620 | 21 | 485~620 |
A671 EFW yeeb nkab specification
| Hom | ASTM A671 Gr. CC60 / CC65 / CC70 LSAW / SAW / EFW Pipe | |
| Executive Standard | API SPEC 5L, GB/T 9711.1, GB/T 9711.2, GB/T 9711.3, SY/T5037 | |
| ASTM A671 Cov Lus Qhia Tshwj Xeeb | Standard Specification for Electric-Fusion-Welded Steel Pipe rau Atmospheric thiab Lower Temperatures | |
| ASTM A672 Cov Lus Qhia Tshwj Xeeb | Standard Specification for Electric-Fusion-Welded Steel Yeeb Nkab rau Siab-Kev Pabcuam Siab ntawm Qhov Kub Kub | |
| Chav Kawm | 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 34, 40, 41, 42, 43, 50, 51, 52, 53, 60, 66, 71, 62, | |
| Loj | Sab nraud | 12-64 hli |
| Phab ntsa Thickness | 2-60 hli TSW 10 SCH 20 SCH 30 STD SCH 40 SCH 60 XS SCH 80 SCH 100 SCH 120 SCH 140 SCH 160 XXS |
|
| Ntev | Ib qho random ntev / Ob chav random ntev 5m-14m, 5.8m, 6m, 10m-12m, 12m lossis raws li tus neeg siv khoom thov tiag | |
| Xaus | Plain kawg / Beveled, tiv thaiv los ntawm lub kaus mom yas ntawm ob hnub, txiav quare, grooved, threaded thiab coupling, thiab lwm yam | |
| Kev kho saum npoo | Liab qab, pleev xim dub, varnished, galvanized, tiv thaiv -corrosion PE PP / EP / FBE txheej |
|
Core Advantages ntawm A671 welded yeeb nkab
Tsawg heev -Tsub Toughness
Los ntawm kev ua tau raws li qhov yuav tsum tau ua ntawm Charpy cuam tshuam lub zog Ntau dua lossis sib npaug ntawm 27J ntawm -45℃(CL22 qib), nws hais txog kev pheej hmoo ntawm kev tawg tawg hauv xov xwm xws li LNG (-162 degree) thiab kua nitrogen (-196 degree).
Kev tswj cov tshuaj lom neeg nruj me ntsis: Phosphorus thiab sulfur cov ntsiab lus (P Tsawg dua lossis sib npaug rau 0.035%, S Tsawg dua lossis sib npaug li 0.035%) txwv tsis pub muaj qhov qis dua -kub brittleness.
Siab -Txoj kev sealing kev ntseeg tau
100% Tsis yog-Kev kuaj kev puas tsuaj ntawm Welds (RT/UT Full Coverage) tshem tawm cov teeb meem xws li tawg thiab tsis muaj fusion.
Hydrostatic Testing ncav cuag 2.5 Sijhawm rau Kev Tsim Siab (xws li, tsim siab 10MPa → ntsuas siab 25MPa) kom paub meej meej sealing nyob rau hauv cryogenic tej yam kev mob.
Txheej txheem Assurance Mechanism
Electrofusion Vuam (EFW) ua ke nrog kev quab yuam tom qab-weld kev kho cua sov (normalizing/quenching + tempering) tshem tawm cov kev ntxhov siab uas seem thiab txhim kho qhov ruaj khov nyob rau hauv qis - qhov kub thiab txias.
Daim ntawv thov ntawm A671 Fais Fusion Welded (efw) Hlau Yeeb Nkab
LNG Kev Lag Luam Chain Core Pipelines
Tau txais Terminal Transportation System (piv txwv li, Rudong Project, Jiangsu):
→ Siv A671 CL22 steel yeeb nkab + 3LPE tiv thaiv- txheej txheej rau kev nyab xeeb LNG kev thauj mus los ntawm -162℃.
Floating Storage thiab Regasification Unit (FSRU):
→ Nkoj - mus rau - cov kav dej txuas txuas txuas nrog lub siab toughness ntawm A671 steel los tiv thaiv kev cuam tshuam yoj.
Cryogenic Medium Cia thiab thauj
Kua Nitrogen Cia Tank Piping Network (-196 degree):
→ A671 CL13 normalized steel yeeb nkab kom tsis txhob cryogenic theem transformation tsis ua hauj lwm.
Cryogenic Chemical Systems
Nruab nrog npib tsib xee-raws li cov ntaub ntawv alloy (xws li Inconel) los tiv thaiv corrosion ntawm cov kua oxygen / kua hydrogen.
