ASTM A516 Qib 70yog lub zog zoo, siab lub nkoj zoo (PVQ) cov pa roj carbon steel phaj tsim los rau nruab nrab mus rau qis dua - qhov kev pabcuam kub, paub txog nws lub zog, weldability, thiab notch toughness, ua rau nws zoo tagnrho rau boilers, cia tank, thiab cov khoom siv tshuaj. Nws muaj zog ntau dua li lwm qib A516 (xws li 55, 60, 65) nrog lub zog tensile ntawm 70-90 ksi (485-620 MPa).
specification
|
Standard / Qib |
Thickness Ntau |
Dav Ntau |
Ntev Ntau |
Khoom Muag Khoom |
|---|---|---|---|---|
|
ASTM A516 GR 70 |
6mm-300 hli |
1500mm-4050mm |
3000mm-15000mm |
As-rolled (≤40mm), Normalized (>40 hli) |
Tshuaj muaj pes tsawg leeg
|
Standard / Qib |
C (Max%) |
Si (%) |
Mn (%) |
P (Max%) |
S (Max%) |
Niag (Max%) |
Cr (Max%) |
Mo (Max%) |
|---|---|---|---|---|---|---|---|---|
|
ASTM A516 GR 70 |
0.27 |
0.15–0.40 |
0.85–1.20 |
0.035 |
0.035 |
0.40 (xaiv) |
0.30 (tshwj xeeb) |
0.08 (xaiv) |
Mechanical Properties ntawm ASTM A516 Qib 70
| Kev piav qhia | Qib 70 |
|---|---|
| Tensile zog (ksi) | 70-90 |
| Tensile zog (MPa) | 485-620 |
| Yield zog (ksi) | 38 |
| Yield zog (MPa) | 260 |
| Elongation hauv 200mm (min) (%) | 17 |
| Elongation hauv 50mm (min) (%) | 21 |
| Thickness (max) (hli) | 205 |
kev khiav dej num
1. Steelmaking & Phaj ntau lawm
Melting: Cov hlau yuav tsum tau "tua" thiab ua kom zoo austenitic grain loj xyaum.
Casting & Rolling: Raw steel yog cam khwb cia rau hauv slabs thiab ces kub - dov rau hauv daim hlau.
Kev kho cua sov (Mill Level):
Normalizing: Pom zoo rau daim hlau tshaj 1.5 nti (40 mm) tuab los yog thaum txhim kho toughness yog xav tau ntawm qhov kub thiab txias. Lub phaj yog rhuab mus rau 1,650–1,750℃F (900–950 degree) thiab huab cua-cooled los ua kom cov qauv nplej.
Raws li -Rolled: Cov phaj nyias nyias (tsawg dua lossis sib npaug li 1.5 ntiv tes) tuaj yeem muab rau hauv raws li -rolled mob tshwj tsis yog tias normalizing.
2. Kev ua thawj coj
Txiav: Cov txheej txheem feem ntau suav nrog Oxy- hluav taws xob txiav, txiav Plasma, lossis Laser txiav nyob ntawm qhov tuab thiab qhov xav tau.
Kev Npaj Nto: Cov txheej txheem zoo li txhaj tshuaj blasting yog siv los tshem tawm cov nplai zeb thiab oxidation, kom ntseeg tau qhov zoo tshaj plaws weldability.
Edge Preparation: Beveling thiab Chamfering yog ua los npaj cov npoo npoo rau vuam pob qij txha.
3. Fabrication & Tsim
Cold/Hot forming: Cov phaj yog dov los yog nias rau hauv cylindrical plhaub los yog tsim rau hauv lub taub hau taub hau.
Machining: A516-70 lub tshuab kuj zoo tab sis tuaj yeem ua haujlwm hnyav. Carbide los yog cobalt cov cuab yeej siv rau drilling, tapping, thiab milling nrog lubrication kom zoo los tswj cov cua sov.
4. Vuam
Cov txheej txheem: Weldable heev siv cov txheej txheem xws li SMAW, GMAW, GTAW, thiab SAW.
Filler Metals: Must offer compatible mechanical properties and impact toughness (e.g., >20 ft -lb ntawm -20℃F lossis -50℃F).
Preheating: Feem ntau xav tau rau cov ntu tuab kom tiv thaiv kev tawg.
5. Tom qab-Kev Kho Mob Fabrication
Tom qab-Kev Kho Hniav Kub Kub (PWHT): Qhov tseem ceeb rau kev daws kev ntxhov siab nyob rau hauv tuab- cov hlab ntsa lossis cov kev pabcuam tshwj xeeb.
Kub: Feem ntau 1,100-1,250 ° F (595-675 ° C).
Tuav Sijhawm: Kev coj ua qauv yog 1 teev ib nti ntawm cov khoom tuab.
6. Kev Tshawb Fawb & Kev Xeem
Tsis yog-Kev Ntsuas Kev Puas Tsuaj (NDT): suav nrog Ultrasonic Examination (UT) (raws li ASTM A435 lossis A578) thiab Magnetic Particle Examination txhawm rau txheeb xyuas qhov tsis zoo sab hauv lossis qhov tawg.
Mechanical Testing: Kev txheeb xyuas zaum kawg ntawm Tensile Strength (70–90 ksi) thiab Yield Strength (min 38 ksi) los ntawm kev ntsuam xyuas nruj thiab Charpy V-notch impact tests.
Thov kev tshaj lij rau ASTM A516 GR 70 los ntawm GNEE Steel.
Qhov siab tshaj plaws phaj thickness rau ASTM A516 GR 70 yog dab tsi?
Standard max thickness yog 200 hli (7.87 nti). Cov phaj tuab yuav xav tau kev ua haujlwm tshwj xeeb thiab kev txheeb xyuas cov cuab yeej cuab tam ntxiv.
ASTM A516 GR 70 yog dab tsi?
Nws yog cov qauv carbon steel phaj rau cov hlab ntsha siab, dav siv hauv nruab nrab / qis-kev pabcuam kub. Nws muaj qhov zoo tshaj plaws weldability thiab notch toughness, haum rau boilers thiab cia tso tsheb hlau luam.
Qhov tsawg kawg nkaus tensile lub zog ntawm ASTM A516 GR 70 yog dab tsi?
Nws lub zog tensile yam tsawg kawg nkaus yog 70 ksi (485 MPa), nrog rau qhov tsawg kawg nkaus yield zog ntawm 38 ksi (260 MPa), ua kom ntseeg tau zoo txhua yam kev ua tau zoo rau siab - cov ntawv siv kabmob.
Qhov ntsuas kub npaum li cas yog ASTM A516 GR 70 haum rau?
Nws ua tau zoo ntawm -29℃(-20℃F) rau 343℃(650℃F). Rau qis temps, kev ntsuam xyuas toughness ntxiv yuav tsum tau rau ib qhov project specs.
Cov qauv dab tsi sib npaug rau ASTM A516 GR 70?
EN 10028-2 P265GH (Tebchaws Europe) thiab GB 713 Q345R (Tuam Tshoj) yog kwv yees sib npaug, tab sis cov kev qhia tshwj xeeb sib txawv; yuav tsum muaj kev txheeb xyuas hla dhau.
ASTM A516 GR 70 puas tuaj yeem siv rau hauv ib puag ncig corrosive?
Nws resists me ntsis corrosion tab sis tsis hnyav xov xwm. Rau corrosive tej yam kev mob, txheej, cladding, los yog upgraded rau hlau alloys yog pom zoo.
Kev kho cua sov dab tsi yog ASTM A516 GR 70 raug rau?
Nws feem ntau yog muab rau hauv normalized, quenched - thiab - tempered, los yog raws li - dov mob. Normalization txhim khu kev sib xws thiab toughness.
ASTM A516 GR 70 yog dab tsi?
Tsis muaj kev ruaj ntseg hardness, tab sis raug Brinell hardness yog 130-180 HB. Welded zones yuav tsum tau kuaj xyuas kom tsis txhob muaj qhov hnyav dhau.
ASTM A516 GR 70 puas tuaj yeem siv rau siab -cov hlab ntsha siab?
Yog, rau nruab nrab -siab siab. Nws lub zog thiab tawv ua tau raws li ASME BPVC qhov yuav tsum tau ua, ua rau nws zoo tagnrho rau cov hlab ntsha siab hauv ntau qhov kev lag luam.
Dab tsi yog qhov ceev ntawm ASTM A516 GR 70?
Nws qhov ceev yog kwv yees li 7.85 g / cm³ (0.284 lb / in³), tib yam li cov qauv carbon steels, yooj yim rau kev xam qhov hnyav rau cov khoom tsim.
Yuav tshuaj xyuas ASTM A516 GR 70 daim hlau li cas?
Kev tshuaj ntsuam xyuas muaj xws li tshuaj ntsuam xyuas, kev ntsuam xyuas txhua yam (tensile, khoov), kuaj pom, kuaj ultrasonic, thiab kev ntsuas cuam tshuam yog tias xav tau.