SA517 Qib Byog lub siab -lub zog, quenched thiab tempered alloy steel phaj feem ntau yog siv rau cov hlab ntsha thiab boilers. Nws muaj cov toughness zoo thiab weldability, haum rau qhov hnyav ib puag ncig nrog kev kub siab thiab kub, ua raws li ASME cov qauv.
Kev xav tau tshuaj
* Cov ntsiab lus sawv cev hauv feem pua
| Cov ntsiab lus | Qib B% |
|---|---|
| Cov pa roj carbon | |
| Kev ntsuas kub | 0.15-0.21 |
| Kev tshuaj xyuas cov khoom | 0.13-0.23 |
| Manganese | |
| Kev ntsuas kub | 0.70-1.00 |
| Kev tshuaj xyuas cov khoom | 0.64-1.10 |
| Phosphorus, max | 0.025 |
| Sulfur, max | 0.025 |
| Silicon | |
| Kev ntsuas kub | 0.15-0.35 |
| Kev tshuaj xyuas cov khoom | 0.13-0.37 |
| Nickel | |
| Kev ntsuas kub | – |
| Kev tshuaj xyuas cov khoom | – |
| Chromium | |
| Kev ntsuas kub | 0.40-0.65 |
| Kev tshuaj xyuas cov khoom | 0.36-0.69 |
| Molybdenum | |
| Kev ntsuas kub | 0.15-0.25 |
Tensile Requirements
| 2.50 in. [65 mm] thiab Under | Tshaj 2.50 mus rau 6 nti [65 txog 150 mm] | |
|---|---|---|
| Lub zog tensile | 115-135 [795-930] | 105-135 [725-930] |
| Yield zog, min, ksi [MPa] | 100 [690] | 90 [620] |
| Elongation hauv 2 nti [50 mm], min, % | 16 | 14 |
| Txo thaj tsam, min, %: | ||
| Rectangular qauv | 35 | – |
| Hloov cov qauv | 45 | 45 |
Daim ntawv thov thiab nta
Cov ntawv thov tseem ceeb: SA517 Qib B feem ntau yog siv rau cov hlab ntsha uas tsis muaj hluav taws kub, boilers, tso tsheb hlau luam, thiab cov khoom siv hluav taws xob uas yuav tsum tau muaj zog thiab tawv.
Weldability: Nws yog weldable, tab sis welding yuav tsum tau ua raws li cov txheej txheem vuam siv tau. Cov kev coj ua tsis tshua muaj hydrogen tau pom zoo kom zam kom tsis txhob muaj teeb meem xws li rov ua kom tawg, uas qib no yuav raug cuam tshuam rau lub sijhawm tom qab-weld heat treatment.
Corrosion Resistance: Nws muaj nruab nrab corrosion kuj; galvanizing lossis coatings tuaj yeem txhim kho nws cov kev ua tau zoo hauv cov tshuaj lom neeg hnyav.
Sib npaug: Nws raug suav hais tias yog sib npaug rau US T-1 steel cov khoom thiab ASTM A514 Qib B cov qauv hlau, txawm hais tias lawv cov ntawv thov zaum kawg txawv (A517 rau cov hlab ntsha siab, A514 rau cov qauv siv xws li txuas hniav).
Kev ua haujlwm ntawm SA517 Qib B
Txiav & Shearing: Txais cov plasma txiav, nplaim taws txiav lossis siab -precision shearing rau blanking; preheat lub phaj rau 100-150℃ua ntej txiav cov phaj tuab (Ntau dua lossis sib npaug li 50mm) txhawm rau tiv thaiv cov kab mob khaub thuas, thiab tshem tawm cov nplai oxide thiab txiav cov burrs tom qab- ua kom cov npoo du.
tsim: Ua cov txheej txheem txias los yog kub sib sau raws li phaj tuab thiab cov qauv tsim; Kev sib sau kub yog pom zoo rau cov duab nyuaj nrog cov phaj tuab, nrog rau qhov kub thiab txias ntawm 850-1100 degree, thiab zam kom txias sai sai tom qab tsim kom tsis txhob muaj kev ntxhov siab sab hauv.
Vuam: Siv tsawg- cov txheej txheem hydrogen welding (GMAW, SMAW, SAW) kom txo qis hydrogen-induced cracking; preheat lub hauv paus hlau rau 150-250℃ua ntej welding, tuav interpass kub tsawg dua los yog sib npaug rau 300℃, thiab ua post-weld heat treatment (PWHT) tam sim ntawd tom qab vuam.
Tshaj tawm -Kev kho cua sov (PWHT): Ua kom muaj kev ntxhov siab rau kev ntxhov siab ntawm 620-680 degree, tuav qhov kub li 1-2 teev ntawm 25mm phaj thickness, ces txias maj mam ntawm tus nqi Tsawg dua los yog sib npaug li 50℃/ teev rau hauv chav tsev kub, tshem tawm cov vuam residual kev nyuaj siab thiab txhim kho toughness.
Tshuab dhos: Ua precision machining (tig, milling, drilling) tom qab kev kho cua sov kom paub meej qhov tseeb; siv siab - hardness txiav cov cuab yeej thiab tswj kev txiav ceev / pub tus nqi kom tsis txhob ua hauj lwm hardening thiab deg puas ntawm cov khoom.
Kev kho cua sov zaum kawg kov-Up: Rau cov khoom uas muaj deformation loj heev thaum lub sij hawm ua, ua ib tug thib ob tempering ntawm 580-650℃los kho cov neeg kho tshuab zog, kom ntseeg tau raws li qhov qub quenched thiab tempered xeev ntawm SA517 Qib B.
Kev kho deg & tshuaj xyuas: Tshem tawm cov xeb, roj thiab impurities ntawm kev txhaj tshuaj blasting lossis pickling; ua tsis yog -kev kuaj kev puas tsuaj (UT, MT, RT) ntawm vuam seams thiab cov qauv tseem ceeb los xyuas kom meej tias tsis muaj kev puas tsuaj sab hauv, ua tau raws li cov qauv kev lag luam siab.
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.
SA517 Qib B puas tuaj yeem siv rau hauv qhov chaw qis - qhov kub thiab txias?
Yog lawm, nws pom zoo qis -kub toughness. Nws tuaj yeem siv rau hauv ib puag ncig qis li -20℃(-4℃F) yam tsis muaj kev pheej hmoo tawg tawg, ua rau nws tsim nyog rau qee qhov kev siv hauv cheeb tsam txias.
Dab tsi yog qhov txawv ntawm SA517 Qib B thiab SA517 Qib F?
Lub ntsiab sib txawv yog nyob rau hauv tshuaj muaj pes tsawg leeg thiab lub zog. SA517 Qib F muaj cov ntsiab lus chromium thiab molybdenum ntau dua, ua rau muaj zog tensile ntau dua (min. 793 MPa) piv rau Qib B (min. 690 MPa), haum rau cov mob hnyav dua.
Yuav ua li cas deg tej yam kev mob rau SA517 Qib B daim hlau?
Cov phaj yuav tsum muaj qhov huv si tsis muaj nplai, xeb, roj, roj, thiab lwm yam kab mob. Cov txheej txheem saum npoo muaj xws li kub- dov, pickled thiab oiled, los yog tua- blasted kom ntseeg tau zoo weldability thiab txheej adhesion.
Dab tsi yog qhov yuav tsum tau elongation ntawm SA517 Qib B?
Nws yuav tsum muaj qhov tsawg kawg nkaus elongation ntawm 16% hauv 50 hli (2 nti) raws li ASME SA-517. Qhov no elongation ua kom cov khoom muaj ductility txaus los tiv thaiv deformation yam tsis muaj cracking.
Yuav tshuaj xyuas qhov zoo ntawm SA517 Qib B daim hlau?
Kev tshuaj xyuas zoo xws li tshuaj lom neeg muaj pes tsawg leeg tsom xam (ntawm spectroscopy), kev ntsuam xyuas cov cuab yeej cuab tam (tensile, impact, hardness test), ultrasonic test (UT) for internal defects, and visual inspection for deg flaws.
Dab tsi yog qhov tuab tuab ntawm SA517 Qib B daim hlau?
Tus qauv thickness ntau yog 6 hli mus rau 200 hli (0.24 nti rau 7.87 nti). Cov phaj tuab tuaj yeem muaj nyob rau ntawm kev thov, tab sis lawv xav tau kev kho cua sov kom nruj dua thiab kev tswj kom zoo los xyuas kom meej cov khoom sib xws.
SA517 Qib B puas tuaj yeem ua tau txias-?
Nws tuaj yeem ua tau txias -, tab sis vim nws lub zog siab, nws yuav tsum muaj zog ntau dua. Preheating tej zaum yuav xav tau rau cov duab complex los yog tuab daim hlau kom tsis txhob tawg thiab txo cov springback.
Dab tsi ncej-weld kho cua sov (PWHT) tau pom zoo rau SA517 Qib B?
PWHT feem ntau pom zoo ntawm 595-650℃(1103-1172℃F) rau 1-2 teev ib nti ntawm tuab. Qhov no txo cov welding residual kev nyuaj siab, txhim kho toughness, thiab restores cov khoom nyob ze ntawm weld cheeb tsam.
Puas yog SA517 Qib B tiv taus corrosion?
Nws muaj nruab nrab corrosion kuj nyob rau hauv atmospheric thiab me me aqueous ib puag ncig. Rau hnyav corrosive tej yam kev mob (xws li, acidic los yog ntsev ib puag ncig), ntxiv coatings (xws li, xim, galvanizing) los yog corrosion-cov alloys resistant yog xav tau.
Modulus ntawm elasticity ntawm SA517 Qib B yog dab tsi?
Lub modulus ntawm elasticity yog kwv yees li 200 GPa (29,000 ksi) ntawm chav tsev kub. Tus nqi no sawv cev rau cov khoom siv tawv, qhia tias nws deforms ntau npaum li cas hauv elastic load.