A671 khoom yog dab tsi?
ASTM A671 yog cov khoom siv rau electrofusion welded steel kav siv rau kev thauj mus los cryogenic, siab - cov kua dej siab.
Khoom yam ntxwv
Basic Composition
Khoom siv: Tsawg- carbon microalloyed steel (tsis yog-stainless steel)
Cov ntsiab lus tseem ceeb:
Cov pa roj carbon (C) Tsawg dua lossis sib npaug li 0.25% → Sib npaug zog thiab weldability
Phosphorus (P) Tsawg dua los yog sib npaug rau 0.035% + Sulfur (S) Tsawg dua los yog sib npaug rau 0.035% → Suppresses cryogenic brittleness (kev tswj nruj ntawm cov khoom tsis zoo)
Manganese (Mn) ntxiv dag zog (feem ntau 0.70 ~ 1.50%) → Txhim kho cryogenic toughness
Cov yam ntxwv txheej txheem:
Electrofusion vuam (EFW) kev tsim khoom → Welds tsis muaj cov hlau muab tub lim
Rwb thaiv tsev -weld heat treatment (normalizing/quenching + tempering) → Relieves stress and optimizes cryogenic performance
Lub zog ntawm ASTM A671
|
Qib Steel |
Tawm taw tes (N / mm2) max |
Tensile zog (N / mm2) max |
Elongation (%) |
|
A45 |
165 |
310~450 |
30 |
|
A50 |
185 |
345~485 |
28 |
|
A50 |
185 |
345~485 |
28 |
|
CA55/A55 |
205 |
380~515 |
27 |
|
B55 |
205 |
380~515 |
27 |
|
CB60/B60 |
220 |
415~550 |
25 |
|
CB65/B65 |
240 |
450~585 |
23 |
|
CB70/B70 |
260 |
485~620 |
21 |
|
C55 |
205 |
380~515 |
27 |
|
CC60/C60 |
220 |
415~550 |
25 |
|
CC65/C65 |
240 |
450~585 |
23 |
|
CC70/C70 |
260 |
485~620 |
21 |
Tshuaj muaj pes tsawg leeg ntawm A671 Pipes
|
Qib steel |
C max |
Si |
Mn |
P |
S |
|
A45 |
0.17 |
/ |
0.98 |
0.035 |
0.035 |
|
A50 |
0.22 |
/ |
|||
|
CA55/A55 |
0.28 |
/ |
|||
|
B55 |
0.20 |
0.13~0.45 |
|||
|
CB60/B60 |
0.24 |
||||
|
CB65/B65 |
0.28 |
||||
|
CB70/C70 |
0.31 |
1.30 |
|||
|
C55 |
0.18 |
0.55-0.98 |
|||
|
CC60/C60 |
0.21 |
||||
|
CC65/C65 |
0.24 |
0.79-1.30 |
|||
|
CC70/C70 |
0.27 |
Qhov txawv ntawm A333 thiab A671 yog dab tsi?
| Sib piv Dimension | ASTM A333 Cov khoom lag luam | ASTM A671 Cov Lus Qhia Tshwj Xeeb |
|---|---|---|
| Standard Name | Tsawg-Tsuas Seamless thiab Welded Steel Pipes | Hluav taws xob-Fusion-Welded Steel Pipes rau Atmospheric thiab qis kub |
| Kev siv thawj zaug | Ultra-low-kub dej kis tau tus mob(LNG, kua ammonia, ethylene) | Tsawg-kub siab -kev xa dej siab(LNG, kua nitrogen) |
| Kev tsim khoom | Seamless los yog welded(ERW/EFW) | Hluav taws xob-fusion-welded (EFW) nkaus xwb+ Kev kho cua sov yuav tsum tau ua |
| Qib ntsuas kub | Qib 1 ~ 11 (piv txwv li, Gr.6: -45 degree, Gr.3: -101 degree) | CL13 ~ CL26 (piv txwv li, CL22: -45 degree) |
| Tsawg-Tsub Toughness | Yuav tsum tau Charpy impact test(Qhov kub sib txawv raws qib) | Yuav tsum tau Charpy impact test(Qhov kub txawv ntawm chav kawm) |
| Hom Yield Strength | Ntau dua lossis sib npaug ntawm 172 ~ 552 MPa (piv txwv li, Gr.6: Ntau dua lossis sib npaug rau 240 MPa) | Ntau dua lossis sib npaug rau 345 ~ 415 MPa (piv txwv li, CL26: Ntau dua lossis sib npaug rau 415 MPa) |
| Tsis yog -Kev kuaj kev puas tsuaj | Welded kav: chaw RT/UT Seamless kav: raws li daim ntawv cog lus |
100% weld RT lossis UT(yuav tsum tau soj ntsuam tag nrho) |
| Tshaj tawm -Kev kho cua sov | Yuav tsum muaj ib qib (piv txwv li, Gr.6 yuav tsum normalizing) | Yuav tsum muaj rau txhua chav kawm |
| Hydrostatic Test | 1.5 ~ 2.5x tsim siab | Uniformly 2.5x tsim siab |
| Kev tiv thaiv corrosion | Epoxy txheej / 3LPE | 3LPE / alloy hauv ob sab phlu |
| Cov ntawv thov raug | Alaska LNG pipeline (Gr.6, -45 degree) | Jiangsu Rudong LNG Terminal (CL22, -162 degree) |
Daim ntawv thov ntawm A671 Welded yeeb nkab
1. Kev thauj mus los ntawm Cryogenic kua
Liquefied Natural Gas (LNG)
A671 steel kav yog cov khoom tseem ceeb rau LNG txais terminals thiab chaw cia khoom, xws li cov kav dej loj ntawm Rudong LNG txais lub davhlau ya nyob twg hauv Jiangsu, Suav teb (φ508mm txoj kab uas hla, CL22 qib, resistant rau -162 degree). Los ntawm 100% tsis muaj kev puas tsuaj ntawm cov welds thiab yuam kev kho cua sov, nws ua kom tsis muaj kev pheej hmoo ntawm nkig tawg nyob rau hauv ib puag ncig cryogenic.
Muaj Gases xws li kua Nitrogen thiab kua Oxygen
Nyob rau hauv aerospace, kev kho mob khaub thuas saw, thiab lwm yam kev lag luam, A671 yog siv los thauj cov kua nitrogen (-196 degree), kua oxygen, thiab lwm yam, tso siab rau nws cov cryogenic cuam tshuam toughness (xws li, qib CL22 muaj kev cuam tshuam lub zog ntau dua lossis sib npaug ntawm 27J ntawm -45 degree) kom muaj kev nyab xeeb.
2. Kev lag luam roj thiab roj
Polar Roj thiab Gas Tshawb Fawb
Cov roj thiab roj hauv ultra- thaj chaw kub tsis tshua muaj xws li Arctic thiab Siberia siv A671 cov kav hlau los thauj cov roj av thiab cov nkev vim lawv tuaj yeem tswj tau lawv qhov kev ua tau zoo ntawm -45℃(CL13 ~ CL22) lossis txawm tias qis dua.
Submarine Pipelines: Qee qhov sib sib zog nqus- cov kav dej hiav txwv roj thiab roj siv A671 cov kav dej, ua ke nrog 3LPE tiv thaiv- txheej txheej, tiv thaiv dej hiav txwv corrosion thiab qis- qhov chaw kub.
3. Tshuaj thiab Refining Industries:
Cryogenic Reactors: Hauv cov txheej txheem tsim tshuaj lom neeg xws li ethylene thiab methanol, A671 cov kav dej yog siv los txuas cov khoom siv cryogenic reactors thiab cov tso tsheb hlau luam cia, tiv thaiv cov kav dej tsis ua haujlwm vim qhov kub thiab txias poob.
Cov chav sib cais cua: Hauv chav sib cais huab cua, A671 cov kav dej feem ntau yog siv rau cov kav dej thauj cov kua roj (xws li kua argon thiab kua carbon dioxide) kom ntseeg tau cov kav dej ruaj khov thaum lub sij hawm hloov cov txheej txheem ntawm cov pa mus rau cov kua.
4. Cheeb Tsam thiab Zog Infrastructure:
Nroog Natural Gas Peak Shaving Stations: Hauv cov chaw ntim cov pa roj carbon monoxide, A671 cov kav dej yog siv los txuas cov tso tsheb hlau luam thiab cov chaw xa khoom xa mus kom tau raws li lub caij nyoog qis - qhov xav tau kub.
Cryogenic Energy Storage Systems: Hauv cov haujlwm xws li Liquid Air Energy Storage (LAES), A671 cov kav dej ua haujlwm ua cov kav dej rau thauj cov khoom siv hluav taws xob nruab nrab (kua cua), txhawb kev sib cuam tshuam ntawm cov khoom siv hluav taws xob tauj dua tshiab . 5. Tshwj xeeb muaj xwm txheej
Kev Lag Luam Semiconductor Ultrapure Gas Tsheb thauj mus los
Hauv kev tsim khoom semiconductor, A671 yog siv los thauj siab -purity nitrogen, argon, thiab lwm yam. Nws cov phab ntsa sab hauv smoothness thiab qis - kub ua tau raws li qhov yuav tsum tau muaj tsis muaj kuab paug thiab tsis muaj paug.
Khoom noj khoom haus Cold Chain Logistics
Qee qhov chaw txias txias loj siv A671 cov kav dej hauv lawv lub tshuab ua kua ammonia tub yees kom ruaj khov cov tub yees ntawm -33 degree.
Kev kuaj thiab tshuaj xyuas
Ntim thiab shipping
