1. Dab tsi yog lub ntsiab hardness scale siv rau kev kuaj galvanized steel coils? Dab tsi yog lawv qhov muaj feem cuam tshuam?
Rockwell hardness scale B (HRB) feem ntau yog siv los kuaj qhov hardness ntawm galvanized steel coils, ua raws li Vickers hardness (HV) thiab Brinell hardness (HB). Kev kuaj Rockwell hardness yuav tsum nias lub pob steel hardened ntawm ib txoj kab uas hla mus rau hauv cov qauv nto nyob rau hauv ib tug tshwj xeeb load. Tus nqi hardness yog txiav txim los ntawm kev ntsuas qhov tob indentation; qhov tob dua, qhov qis dua qhov hardness. Txoj kev no yog ceev thiab tsis tas yuav ntsuas qhov indentation kab pheeb ces kaum, ua rau nws dav siv rau kev tswj kom zoo hauv kev tsim khoom. Txij li cov khoom siv hauv paus ntawm cov ntawv hlau galvanized feem ntau yog qis - carbon steel thiab qis- alloy steel, nrog lub thickness feem ntau yog li ntawm 0.3 mus rau 5.0 hli, HRB nplai yog qhov tshwj xeeb. Nws tag nrho cov load yog 100 kg, siv ib tug steel pob indenter nrog ib txoj kab uas hla ntawm 1/16 nti. Thaum lub hauv paus khoom muaj zog yog siab thiab hardness tshaj HRB 100, HRC lossis HRA nplai (siv lub pob zeb diamond cone indenter) tuaj yeem siv, thiab qhov tob indentation yuav tsum tau tswj kom tsis txhob indenter tsis ua haujlwm. Vickers hardness (HV) yog qhov muaj ntau yam thiab tsim nyog rau kev ntsuas qhov nyuaj ntawm cov phaj nyias nyias - ntu lossis thaj chaw microscopic. Txawm li cas los xij, nws qeeb rau kev sim thiab xav tau qhov chaw siab ntawm cov qauv, yog li nws feem ntau yog siv rau kev txiav txim siab zoo. Hauv kev xyaum ua engineering, Leeb hardness testers kuj tseem siv tau rau ntawm -qhov chaw tsis yog- kuaj kev puas tsuaj, nrog HRB thiab HV yog qhov zoo tshaj plaws. Cov txiaj ntsig kev xeem tau hloov pauv mus rau qhov muaj zog tensile qhov tseem ceeb rau kev txiav txim siab ntawm cov khoom.
2. Yuav ua li cas cov qib hardness ntawm galvanized coils cais los ntawm softest mus hardest raws li lawv ua hauj lwm hardening degree?
A: Cov qib hardness ntawm galvanized coils tau muab faib ua tsib theem ntawm softest mus rau hardest raws li kev ua hauj lwm hardening℃ntawm cov khoom siv hauv paus tom qab txias dov thiab nws lub xeev annealing. Annealed soft state (feem ntau yog xaiv S) sib raug rau qhov hardness ntawm kwv yees li HRB 85-110. Cov khoom siv hauv paus tau dhau los ua tiav recrystallization annealing, ua rau cov qauv zoo sib xws thiab cov yas zoo, haum rau kev kos duab sib sib zog nqus. 1/8 nyuaj sib haum rau HRB 50-71, HV 95-130. Cov khoom siv hauv paus tau dhau los ua haujlwm me ntsis txias dov hardening, siv rau qhov ntiav ntiav thiab cov khoom siv khoov dav dav . 1/4 nyuaj sib raug rau HRB 65-80, HV 115-150. Nws muaj qee lub zog thiab tswj tau zoo formability, haum rau kos duab cylindrical qhov chaw ntiav thiab cov qauv kev txhawb nqa. 1/2 nyuaj sib haum rau HRB 74-89, HV 135-185. Lub zog tau txhim kho ntxiv, siv rau cov khoom siv dav dav thiab cov khoom siv nrog qee qhov kev xav tau ntawm cov kabmob. Cov ntaub ntawv nruj nruj sib haum rau HRB 85 thiab siab dua thiab HV 170 thiab siab dua. Cov khoom siv hauv paus yog unannealed los yog tsuas yog maj mam annealed, tswj lub siab-lub zog hardened xeev tom qab txias dov. Lawv yog siv nyob rau hauv daim ntawv thov uas siab rigidity yuav tsum tau thiab complex forming yog tsis tsim nyog, xws li ru tsev panels thiab corrugated vuas.
3. Cov qib hardness ntawm galvanized coil qhia nyob rau hauv siab -lub zog steel thiab cov khoom siv qib zoo li cas?
A: Rau qis- alloy siab- lub zog steel thiab duplex steel galvanized coils, tus nqi hardness tsis tuaj yeem siv ncaj qha raws li qib qib, tab sis qib lub zog tuaj yeem cuam tshuam ncaj qha los ntawm qhov nyuaj. Piv txwv li, raws li EN 10292 tus qauv, kub-dip galvanized nag lossis daus- steel muaj zog yog muab faib ua ob peb qib raws li lub zog tawm los, xws li HX260LAD, HX300LAD, HX340LAD, HX380LAD, thiab HX420LAD. Lub zog yog txhim kho los ntawm kev ntxiv cov ntsiab lus microalloying xws li Nb thiab Ti los ntawm nag lossis daus ntxiv dag zog thiab cov nplej ua kom zoo. Ntawm lawv, HX380LAD thiab qib siab dua tuaj yeem ncav cuag lub zog tensile ntawm ntau dua 550 MPa, sib xws rau hardnesses ntawm kwv yees li HRB 85 ~ 95 thiab HV 170 ~ 210. Hauv ASTM A653 tus qauv, qib siab -lub zog qis- hlau alloy (HSLAS) ncaj qha qhia qhov tsawg kawg nkaus tawm lub zog los ntawm kev xaiv qib. Cov qib steel uas yuav tsum tau ua kom tau raws li qhov yuav tsum tau ua ntawm hardness yuav tsum tau teev tseg nyob rau hauv tus qauv, thiab cov hardness xeem tej yam kev mob yog qhia meej meej. Rau cov txheej txheem qib galvanized steel los xij (S series) xws li S220GD thiab S350GD hauv European tus qauv EN 10147, tus qauv nws tus kheej tsis tswj hwm tus nqi hardness, tab sis nyob rau hauv qhov tseeb ntau lawm, hardness yog siv raws li tus txheej txheem tswj qhov taw qhia rau annealing xeev thiab txheej txheem stability.
4. Dab tsi yog qhov kev hloov pauv kev sib raug zoo ntawm hardness thiab lub zog, thiab nws cov kev siv hauv engineering yog dab tsi?
A: Rau cov pa roj carbon steel thiab qis - alloy steel substrates siv nyob rau hauv galvanized coils, muaj ib tug zoo linear zoo correlation ntawm Rockwell hardness (HRB) thiab tensile zog. Hauv kev ua lag luam, ib qho qauv siv feem ntau siv rau kev hloov pauv kwv yees: Tensile zog (MPa) ≈ 3.2 × HRB + 150 (Cov mis no siv tau rau qis- carbon steel nrog HRB ntau ntawm 50 ~ 100). Kev ntsuas hardness yog qhov yooj yim thiab ceev, thiab tuaj yeem ua tsis tu ncua ntawm cov kab ntau lawm, thaum kuaj tensile yuav tsum tau txiav cov qauv qauv thiab yog lub sij hawm siv -siv. Yog li ntawd, kev ntsuam xyuas hardness yog dav siv nyob rau hauv cov txheej txheem zoo tswj kom sai li sai tau tus neeg kho tshuab zog ntawm qhov chaw. Nyob rau ntawm qhov chaw engineering, cov neeg ua haujlwm siv Leeb hardness testers los yog portable Rockwell hardness testers los ua hardness tests ntawm galvanized coils los yog cov khoom tiav, hloov HRB tus nqi rau tensile zog tus nqi los ntawm kev xa mus rau cov ntxhuav, thiab tom qab ntawd txiav txim siab seb cov khoom puas ua tau raws li cov qauv tsim raws li cov qauv xws li GB / T 700 thiab GB / T 1591. qib thiab cov kev kho cua sov zoo sib xws. Rau galvanized coils nrog cov txheej txheem sib txawv (xws li IF steel thiab phosphorus- muaj cov hlau siab - zog), tib cov qauv hloov pauv tsis tuaj yeem siv ncaj qha hla cov ntaub ntawv.
5. Puas yog zinc plating txheej nws tus kheej cuam tshuam rau qhov kev sim hardness? Yuav ua li cas kom raug khiav lag luam kom tau qhov tseeb hardness ntawm lub substrate?
A: Qhov cuam tshuam ntawm zinc plating txheej ntawm qhov kev ntsuam xyuas hardness ntawm lub substrate yog feem ntau negligible. Lub thickness ntawm zinc plating txheej feem ntau yog nruab nrab ntawm 5 thiab 30 micrometers (tag nrho rau ob sab, kwv yees li 2.5 mus rau 15 micrometers rau ib sab), thaum lub qhov tob tob ntawm Rockwell hardness test steel pob indenter ntawm cov hlau nto feem ntau ncav cuag 0.1 txog 0.5 millimeters. Qhov tob indentation deb tshaj qhov tuab ntawm zinc plating txheej. Yog li ntawd, qhov ntsuas hardness tus nqi yog txiav txim siab los ntawm steel substrate; cov zinc txheej tsuas yog muab cov txheej txheej ntiav thiab nws txoj kev txhawb nqa rau indentation kuj yog negligible. Baosteel kuj tau hais meej meej hauv nws cov khoom siv tshwj xeeb uas cuam tshuam ntawm zinc plating txheej nws tus kheej ntawm tus nqi hardness yog negligible. Txawm li cas los xij, txhawm rau kom ntseeg tau qhov tseeb ntawm cov txiaj ntsig kev ntsuas, tseem yuav tsum tau sau tseg cov ntsiab lus hauv qab no: Ua ntej, ua ntej kev sim, zinc - nplua nuj txheej thiab cov roj stains nyob rau saum npoo ntawm qhov ntsuas qhov ntsuas tau maj mam muab tshem tawm nrog cov ntawv xuab zeb zoo, tab sis cov xuab zeb ntau dhau yuav tsum zam kom tsis txhob muaj kev puas tsuaj rau lub substrate; thib ob, tsawg kawg 35 cov ntsiab lus xeem yuav tsum tau coj mus rau hauv qhov dav thiab ntev cov lus qhia kom tshem tawm ib qho - cov ntsiab lus yuam kev; Thaum kawg, thaum muaj qhov pom tseeb longitudinal hardness fluctuations nyob rau hauv galvanized coils, nws feem ntau qhia txog cov txheej txheem teeb meem xws li uneven annealing kub ua ntej galvanizing, es tsis yog deviations los ntawm lub txheej nws tus kheej, thiab yuav tsum tau lees paub los ntawm tensile xeem thiab microstructure tsom xam. Rau cov khoom tuab-coated nrog cov txheej txheej loj heev (xws li ntau dua 80 micrometers), nws raug nquahu kom me ntsis zom qhov ntsuas ntawm tus qauv mus rau txheej txheej ua ntej ua qhov kev sim hardness kom tau txais qhov tseeb tshaj plaws thiab txhim khu kev qha substrate hardness tus nqi.