ASTM A516 Qib 70yog ib qho nrov, siab -lub zog carbon steel phaj rau welded siab hlab ntsha thiab tso tsheb hlau luam, muaj nuj nqis rau nws zoo heev lub zog thiab toughness nyob rau hauv nruab nrab mus rau qis kub kev pab cuam, feem ntau siv nyob rau hauv cov roj, roj, thiab tshuaj industries, nrog rau daim ntawv thov los ntawm txuas hniav mus rau boilers. Nws muaj lub zog tensile siab dua li lwm qib A516 (xws li 55, 60, 65) thiab paub txog qhov zoo weldability thiab notch toughness, muaj manganese, phosphorus, sulfur, thiab silicon.
Khoom Khoom
Cov khoom siv hauv qab no yog ASTM cov lus qhia tshwj xeeb thiab yuav raug lees paub ntawm Mill Test Report.
| Qib | Yield Point (ksi) | Tensile zog (ksi) | Tsawg. 8" Elongation % |
| 70 | 38 | 70-90 | 17 |
A516 Steel Phaj Chemical Composition
| Qib 70 | |
| Carbon Max, Tsawg dua los yog sib npaug rau 1/2 "Thick | 0.27% |
| Carbon Max, >1/2 "& Tsawg dua los yog sib npaug rau 2" Thick | 0.28% |
| Carbon Max, >2 "& Tsawg dua los yog sib npaug rau 4" Thick | 0.30% |
| Carbon Max, >4 "Thick | 0.31% |
| Manganese | 0.85-1.20% |
| Phosphorus max | 0.025% |
| Sulfur max | 0.025% |
| Silicon | 0.15-0.40% |
Cov txheej txheem tseem ceeb
1. Kev kho cua sov
Kev kho cua sov yog qhov tseem ceeb rau kev ua tiav cov khoom siv kho tshuab, tshwj xeeb tshaj yog rau cov phaj tuab.
Normalizing: Yuav tsum tau ua rau daim hlau tshaj 1.5 nti (38 mm) tuab. Qhov no suav nrog cua sov cov hlau mus rau 1,650-1,750℃F (900-950 degree) tom qab cua txias los ua kom cov qauv nplej thiab txhim kho toughness.
Kev Tiv Thaiv Kev Nyuaj Siab (PWHT): Tom qab-weld kev kho cua sov feem ntau ua tau ntawm kwv yees li 1,150℃F (620℃). Ib txoj cai zoo yog tuav cov khoom ntawm qhov kub no rau ib teev ib nti ntawm tuab.
2. Vuam
A516-70 yog weldable heev tab sis yuav tsum tau saib xyuas los tiv thaiv hydrogen-induced cracking (HIC), tshwj xeeb tshaj yog nyob rau hauv ib puag ncig txias los yog tuab seem.
Preheating: Pom zoo rau cov ntu tuab, feem ntau ntawm 200-300℃F (95-150 degree).
Filler Metals: Cov kev xaiv feem ntau suav nrog AWS ER70S-6 rau cov hauv paus hla thiab E71T-12MJ H4 lossis E70C-6M H4 rau sau thiab hla dhau.
Cov txheej txheem: Fabrication yuav tsum tau ua raws li nruj ASME Boiler thiab Pressure Vessel Code (BPVC) cov qauv.
3. Txiav thiab sib sau
Txiav: tuaj yeem ua tiav siv cov txheej txheem precision xws li kev txiav bandsaw (nrog rau kev ua siab ntev nyob ib puag ncig ± 1mm), ntshav, lossis laser txiav.
Kev sib sau: Cov khoom siv tau yooj yim tsim, tab sis kev sib tsoo hnyav tuaj yeem ua rau thinning. Maj mam, tswj dov yog nyiam dua ib qho sib sib zog nqus rub kom tswj cov phab ntsa tuab.
Txheej txheem Specifications Table
| Feature | Yuav tsum tau / pom zoo |
|---|---|
| Normalizing Temp | 1,650 - 1,750 ° F (900 - 950 ° F) |
| Stress Relieving Temp | 1,150 ° F (620 ° F) |
| Preheat Temp | 200-300 ° F (95-150 ° F) |
| Max Thickness (Raws li -Rolled) | 1.5 nti (38 hli) |
Kev Xeem Ntxiv
Thaum ua tiav, daim hlau yuav raug kuaj ntxiv kom ntseeg tau tias lawv ua tau raws li qhov xav tau ntawm ib puag ncig:
Charpy V-Notch (CVN): Ntsuas qhov cuam tshuam rau qhov hnyav ntawm qhov kub thiab txias (xws li -50℃F).
HIC Kev Ntsuas: Yuav tsum tau ua rau "kev pabcuam qaub" (cov pa roj corrosive) ib puag ncig los kuaj xyuas hydrogen-induced cracking resistance.
Ultrasonic Examination: Siv los txheeb xyuas cov teeb meem sab hauv lossis laminations hauv lub phaj.
Primary Industrial Applications
Roj, Roj & Petrochemical:
Siv dav rau siab - cov khoom siv siab xws li cov khoom sib cais, cov kab distillation, reactors, thiab cov kav dej. Tshwj xeeb "Sour Service" variants (NACE-ua raws) yog siv rau ib puag ncig uas muaj hydrogen sulfide (H₂S) los tiv thaiv kev tawg.
Kev tsim hluav taws xob:
Qhov tseem ceeb rau kev tsim kho ntawm cov boilers, chav nruas, thiab cua kub exchangers. Nws kuj pom muaj nyob rau hauv cov hlab ntsha nuclear thiab cov kav dej vim nws cov pob txha toughness.
Cia & Thauj:
Feem ntau yog siv rau loj - lub tank ntim loj (API 650/620) tuav cov kua ntawm qhov kub nruab nrab, thiab hauv kev tsim cov tsheb ciav hlau, cov thawv ntim khoom, thiab cov tsheb thauj khoom.
Renewable Zog:
Ua hauj lwm hauv hydroelectric penstock kav thiab tshwj xeeb Cheebtsam rau cryogenic ib puag ncig, xws li LNG cia.
Tiv tauj peb ntawm beam@gneesteelgroup.com rau tus nqi, kev txhawb nqa, lossis kev daws teeb meem. Peb yeej ib txwm npaj los txhawb koj qhov project.
A516 Qib 70 (ASTM Standard) yog dab tsi?
Nws yog cov pa roj carbon steel phaj raws li ASTM cov qauv, feem ntau yog siv rau kev tsim khoom nruab nrab thiab qis kub siab. Nws muaj lub zog zoo, toughness thiab weldability, nrog lub zog tawm los ntawm ntau dua lossis sib npaug ntawm 260MPa, lub zog tensile ntawm 485-655MPa, thiab qhov ntsuas kub ntawm -30℃txog 450 degree.
Dab tsi yog cov ntawv thov tseem ceeb ntawm A516 Qib 70?
Nws yog tsuas yog siv los tsim lub siab-cov khoom siv xws li lub tank cia, boilers, cov hlab ntsha siab thiab cov kav dej, thiab tau siv dav hauv roj av, tshuaj, roj av, hluav taws xob thiab lwm yam kev lag luam kom ua tau raws li qhov xav tau ntawm kev nyab xeeb ntawm nruab nrab thiab qis kub siab-cov kabmob ua haujlwm.
Tus qauv yield zog thiab tensile zog qhov tseem ceeb ntawm A516 Qib 70 yog dab tsi?
Qhov tsawg kawg nkaus yield zog (σs) yog 260MPa, thiab lub zog tensile (σb) nyob ntawm 485MPa rau 655MPa. Cov kev ntsuas lub zog no ua kom ntseeg tau tias cov phaj hlau tsis tuaj yeem ua rau cov yas deformation thiab tawg hauv siab -cov kabmob puag ncig, tiv thaiv cov cuab yeej kev nyab xeeb.
Dab tsi yog qhov ntsuas kub ntawm A516 Qib 70?
Qhov ntsuas kub siv tau yog -30℃txog 450℃. Nyob rau hauv no ntau yam, nws muaj peev xwm tswj tau ruaj khov mechanical zog, tsis muaj kev pheej hmoo ntawm nkig tawg ntawm qhov kub thiab txias, thiab nws lub zog thiab toughness ua tau raws li cov kev khiav hauj lwm yuav tsum tau ntawm lub siab-bearing khoom ntawm kub kub.
Dab tsi yog qhov tseem ceeb ntawm cov tshuaj muaj pes tsawg leeg rau A516 Qib 70?
Cov khoom tseem ceeb: Carbon (C) Tsawg dua lossis sib npaug li 0.30%, Manganese (Mn) 0.85-1.20%, Phosphorus (P) Tsawg dua lossis sib npaug li 0.035%, Sulfur (S) Tsawg dua lossis sib npaug li 0.035%, Silicon (Si) 0.15-0.40%. Cov ntsiab lus ntawm teeb meem impurities yog nruj me ntsis tswj kom ntseeg tau tias kev ua tau zoo.
Weldability ntawm A516 Qib 70 yog dab tsi?
Nws muaj zoo weldability. Tsis tas yuav tsum tau ua kom sov ua ntej ua ntej welding (tshwj tsis yog rau cov phaj tuab lossis - qhov kub thiab txias). Tom qab vuam, lub zog thiab tawv ntawm kev sib koom ua ke ntawm cov hlau hauv paus, thiab cov qauv siv vuam xws li cov hlau thaiv hlau arc vuam thiab roj hlau arc vuam siv tau.
Dab tsi yog qhov txawv ntawm A516 Qib 70 thiab A516 Qib 60?
Qhov sib txawv tseem ceeb nyob hauv lub zog: Qib 70 muaj lub zog tawm los ntawm 260MPa, thaum Qib 60 yog 205MPa; tus qub kuj muaj zog tensile ntau dua. Nws yog qhov tsim nyog rau kev ua haujlwm nrog cov kev xav tau nruj dua ntawm kev siab - bearing lub zog, thaum lub tom kawg yog siv rau qis -load scenarios.
Dab tsi yog qhov kev xa khoom ib txwm muaj ntawm A516 Qib 70 steel daim hlau?
Txoj kev xa khoom ib txwm yog kub- dov lossis tswj tau- dov, thiab kev kho kom zoo (N) tuaj yeem ua tau yog tias tsim nyog. Kev kho kom zoo tuaj yeem kho cov nplej, txhim kho qhov toughness thiab uniformity ntawm steel phaj, thiab ua tau raws li qhov yuav tsum tau rau cov khoom ruaj khov hauv kev ua haujlwm hnyav.
Yuav ua li cas kuaj cov khoom siv kho tshuab ntawm A516 Qib 70?
Cov kev ntsuam xyuas tseem ceeb suav nrog kev ntsuas tensile (los ntsuas qhov muaj zog, lub zog tensile thiab elongation), kev ntsuas cuam tshuam (Charpy V-notch, ntsuas qis-kub toughness), thiab hardness test. Cov qauv kuaj yuav tsum raug txiav los ntawm cov hlau phaj nws tus kheej raws li cov qauv ASTM.
Dab tsi yog qhov qis - qhov kub thiab txias yuav tsum muaj zog rau A516 Qib 70?
Ntawm -30 degree, Charpy V-notch impact energy (Ak) yog Ntau dua lossis sib npaug rau 27J (tus nqi nruab nrab), thiab lub zog cuam tshuam ntawm ib qho qauv tsis tsawg dua 20J. Qhov no ua kom ntseeg tau tias cov phaj hlau muaj qhov cuam tshuam txaus rau hauv qhov qis - qhov kub thiab txias qhov chaw kom tsis txhob muaj kev puas tsuaj.