ASTM A515 Qib 70(feem ntau hu ua A515 Gr. 70 lossis SA515 Gr. 70) yog siab -lub zog carbon- silicon steel phaj feem ntau siv rau nruab nrab thiab siab dua- qhov kev pabcuam kub hauv cov welded boilers thiab lwm cov hlab ntsha siab.
ASTM A515 Qib 70 Phaj Specifications
|
Specifications |
ASTM A515 Cov Lus Qhia Tshwj Xeeb |
|
Thickness |
8-100 hli |
|
Dav |
1500-3500 hli |
|
Ntev |
3000-8000mm |
|
Nto |
2B, 2D, BA, NO.1, NO.4, NO.8, 8K, daim iav, checkered, embossed, plaub hau kab, xuab zeb blast, Txhuam, etching, thiab lwm yam |
|
Ua kom tiav |
Kub dov phaj (HR), Cold Rolled Sheet (CR) |
|
Daim ntawv |
Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Sawb thiab lwm yam. |
Chemical Composition (%):
|
Qib / Khoom siv |
Element |
Composition(Max-A, Min-I) |
|
A515 Qib 70 / A515 Gr70 |
C |
A:0.31 |
|
Mn |
A:1.20 |
|
|
Si |
0.15-0.40 |
|
|
P |
A:0.035 |
|
|
S |
A:0.035 |
Mechanical Properties (Mpa)
|
Qib / Khoom siv |
Tensile Test |
Ksi/MPa |
|
A515 Qib 70 / A515 Gr70 |
Tensile zog |
70-90/485-620 |
|
Yield zog |
38/260 |
|
|
Elongation |
17% |
|
|
Impact Test (yog tias muaj) |
|
Sib piv nrog Lwm Cov Qib ASTM A515
|
Khoom |
A515 Qib 60 |
A515 Qib 65 |
A515 Qib 70 |
|---|---|---|---|
|
Cov ntsiab lus carbon (Max%) |
0.24-0.31 |
0.28-0.33 |
0.30-0.35 |
|
Manganese (Max%) |
0.98 |
0.98 |
1.30 |
|
Yield zog (Min Mpa) |
220 |
240 |
260 |
|
Tensile zog (Mpa) |
415-550 |
450-585 |
485-620 |
|
Elongation (Min%, 200mm) |
21 |
19 |
17 |
kev khiav dej num
1. Steelmaking & Casting
Melting:Tsim los ntawm Electric Arc Rauv (EAF)los yog Basic Oxygen Rauv (BOF).
Ladle Refining:Precise tshuaj kho thiab nqus degassing kom purity.
Deoxidation:Cov hlau yuav tsum yog Killed Steel (镇静钢).
Grain xyaum:Ua rau Coarse Austenitic Grain Sizexyaum (grain loj 1 txog 5) los txhim kho siab -kub creep kuj.
2. Rolling & Kev kho cua sov
Reheating:Slabs yog rhuab nyob rau hauv ib lub qhov cub kom txog li 1100℃-1250 degree.
Kub Rolling:Ntau- dhau dov kom ua tiav qhov kawg tuab thiab cov khoom siv kho tshuab.
Thaum tshav kub kub kho mob:
Thickness
Tsawg dua los yog sib npaug50mm (2 nyob rau hauv):Feem ntau muab rau hauv As -Rolledmob.
Thickness > 50 hli (2 nti):Yuav tsum Normalized(加热至 900-950℃后空冷) los kho cov qauv nplej thiab xyuas kom zoo ib yam khoom.
3. Fabrication Processing
Txiav:Siv Oxy-propane nplaim taws, Plasma, los yog Laser txiav.
Kev tsim:
Cold forming:Haum rau nruab nrab khoov thiab shaping.
Kub txoj kev:Pom zoo rau qhov hnyav, feem ntau ua ntawm 900℃thiab 1100 degree.
Machining:Pa drilling, milling, thiab tig (zoo ib yam li AISI 1330 kev ua tau zoo).
4. Vuam txheej txheem
Filler hlau:Feem ntau siv E7018(SMAW) lossis cov xov hlau sib xws xws li ER70S-6 (GMAW).
Preheating:Preheating rau 95℃-150 degreefeem ntau yuav tsum tau, tshwj xeeb tshaj yog rau cov phaj tuab, los tiv thaiv hydrogen -induced cracking.
PWHT (Post-Kev kho cua sov):Kev ntxhov siab -Nyob rau hauv annealing feem ntau yog yuav tsum tau los ntawm ASME cov lej tom qab vuam los txo cov kev ntxhov siab uas seem.
5. Kev Tshawb Fawb & Kev Ntsuas
Mechanical Testing:
Tensile Test:Yam tsawg kawg nkaus 485 MPa (70 ksi).
Yield Test:Yam tsawg kawg nkaus 260 MPa (38 ksi).
Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT):
Ultrasonic Examination (UT):Ua raws li ASTM A435 lossis A578.
Sib Nqus Particle (MT) / Radiographic Test (RT):Siv los txheeb xyuas qhov tseeb ntawm qhov vuam.
Kev kho qhov saum npoo:Tua blasting, pickling, los yog painting.
qhov zoo
1. Superior High -Tsub Ua Haujlwm
Tsis zoo li ASTM A516, uas yog optimized rau qis -kub toughness, A515 Gr.70 yog tsim los rau coarse grain xyaum.
Creep Resistance: Coarse grains muab kev tiv thaiv zoo dua rau creep deformation ntawm qhov kub siab.
Kev Tiv Thaiv Graphitization: Cov qauv no yuav pab txo qis graphitization, ua rau nws zoo tagnrho rau cov kav dej thiab siab -kub siab cov hlab ntsha.
2. Muaj zog thiab kav ntev
Raws li qib siab zog siab tshaj plaws hauv A515 series, Qib 70 muab:
Siab Tensile Strength: Feem ntau ntawm 485–620 MPa (70–90 ksi), tso cai rau cov khoom siv los tiv thaiv kev kub ntxhov sab hauv thiab sab nraud.
Structureal Integrity: Nws durability thiab toughness ua kom lub neej ntev hauv kev xav tau ib puag ncig xws li kev tsim hluav taws xob thiab kev ua lag luam petrochemical.
3. Fabricability zoo heev
Zoo Weldability: Nws tuaj yeem txuas tau yooj yim siv cov txheej txheem xws li SMAW (xws li E7018 electrodes), TIG, thiab MIG.
Formability & Machinability: Txawm hais tias nws lub zog, nws tswj tau zoo ductility, txhawb kev ua haujlwm txias thiab cov txheej txheem machining zoo ib yam li cov pa roj carbon steel.
4. Tus nqi -Kev ua tau zoo
Kev xaiv kev lag luam: Piv nrog rau cov khoom tshwj xeeb siab- alloy lossis cov khoom sib txawv, A515 Gr.70 muaj qhov sib npaug txhim khu kev qha ntawm kev ua tau zoo thiab cov khoom siv qis, ua rau nws zoo tagnrho rau cov nqi- cov haujlwm rhiab heev uas yuav tsum muaj kev pabcuam siab - kub.
5. Versatility thoob plaws Industries
Nws cov khoom ua rau nws xaiv tus qauv rau:
Boilers & Thaum tshav kub kub Exchangers: Muaj chav tshuab thiab cov khoom siv thermal.
Pressure Vessels: Storage tanks and containers for the oil, gas, and chemical industries.
Kev siv cov qauv: Tsim cov siab - lub zog fasteners thiab bolts.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
Dab tsi yog qhov yuav tsum tau ua cim rau A515 Qib 70 daim hlau?
Txhua lub phaj yuav tsum tau cim nrog qib, kub tooj, thickness, chaw tsim tshuaj paus lub logo thiab ASTM A515 ua raws li traceability.
Dab tsi yog -rolled condition ntawm A515 Qib 70?
Raws li - dov txhais tau tias ntuj txias tom qab dov yam tsis muaj kev kho cua sov ntxiv, ua tau raws li cov kev xav tau yooj yim rau kev siv dav dav.
Yuav ua li cas normalization txhim kho kev ua tau zoo ntawm A515 Qib 70?
Normalization (kub siab tshaj qhov ntsuas kub, tuav, huab cua-txias) ua kom cov nplej, txo kev ntxhov siab thiab txhim kho cov tawv nqaij thiab microstructure uniformity.
Dab tsi yog qhov siab tshaj plaws sulfur (S) cov ntsiab lus tso cai rau A515 Qib 70?
Max S cov ntsiab lus yog 0.035% los ntawm qhov hnyav. Tshaj S ua rau kub brittleness thiab impairs cov hlau weldability.
A515 Qib 70 puas tuaj yeem siv rau hauv qis- qhov kub thiab txias hauv qab -20℃F (-29 degree)?
Tsis pom zoo. Hauv qab -20℃F (-29 degree), nws lub zog poob qis, ua rau muaj kev pheej hmoo ntawm pob txha tawg.
Dab tsi yog qhov ua haujlwm ntawm nruam casting hauv A515 Qib 70 ntau lawm?
Nws hloov molten steel rau hauv slabs tsis tu ncua, txhim kho efficiency, txo cov khib nyiab thiab ua kom cov khoom zoo ib yam.
Dab tsi ncej-weld kev kho cua sov yog pom zoo rau A515 Qib 70?
Kev ntxhov siab nyem annealing yog pom zoo kom txo qis qhov seem vuam kev nyuaj siab, tiv thaiv kev tawg thiab ruaj khov kev sib koom ua haujlwm.
Yuav ua li cas oxide nplai tshem tawm ntawm A515 Qib 70 daim hlau tom qab dov?
Kev tua blasting (cov khoom abrasive) los yog pickling (acidic solutions) yog siv los tshem tawm oxide nplai los ntawm lub phaj phaj.
Puas yog A515 Qib 70 haum rau siab - kev pabcuam siab?
Teb: Yog, rau nruab nrab- siab siab, muab nws ua tau raws li ASTM A515's thickness thiab cov cuab yeej cuab yeej cuab tam rau daim ntawv thov.
Vim li cas ultrasonic kuaj (UT) tseem ceeb rau A515 Qib 70 daim hlau?
Teb: UT kuaj pom qhov tsis pom hauv sab hauv, ua kom lub phaj sab hauv kev ncaj ncees rau kev siv boiler thiab lub nkoj siab.