Kev yuav khoom ntau SPA-H Corten Steel (JIS G 3125 tus qauv) los ntawm cov neeg muag khoom txawv teb chaws tuaj nrog cov kev pheej hmoo tseem ceeb: tau txais cov ntaub ntawv uas tsis ua raws li cov cuab yeej cuab tam (yield zog ntau dua lossis sib npaug ntawm 345MPa, tensile zog 480-620MPa). Yuav ua li cas kom ntseeg tau tias kev ua raws cai thiab tsis txhob raug nqi rov ua dua lossis muaj kev nyab xeeb? Lub ntsiab logic yogdaim ntawv cog lus ua ntej- tswj + ntaub ntawv pov thawj + ntawm - qhov chaw kuaj pom tseeb. Hauv qab no yog ib daim ntawv qhia luv luv, ua kom tau raws li kev hla - ciam teb qhov xwm txheej.
1. Ua ntej-Kev yuav khoom: Xauv qhov yuav tsum tau muaj hauv daim ntawv cog lus
Thawj kab ntawm kev tiv thaiv yog qhia meej cov cai pov thawj hauv daim ntawv cog lus kev yuav khoom kom tsis txhob muaj kev sib cav tom qab- xa khoom:
Qhia meej meej JIS G 3125 cov cuab yeej cuab tam cov qauv: Yield Strength (YS) Ntau dua lossis sib npaug ntawm 345MPa, Tensile Strength (TS) 480-620MPa, thiab Elongation Ntau dua lossis sib npaug li 21%.
Teem caij cov neeg muab khoom siv los muab Cov Ntawv Qhia Txog Mill Test (MTRs) rau txhua tus naj npawb cua sov (ib qho khoom tawg), nrog rau cov ntawv xov xwm zeb thiab cov lej xov tooj uas tuaj yeem nrhiav tau.
Tuav txoj cai thib peb rau -kev kuaj sampling thib peb thiab txheeb xyuas qhov kev lav phib xaub rau kev tsis ua raws li -kev ua raws (xws li cov nyiaj rov qab tag nrho, hloov pauv dawb, them nyiaj rau cov nqi thauj khoom).
2. Thaum lub sij hawm xa tuaj: Rigorous MTR Review & Preliminary Check
MTRs yog cov ntaub ntawv tseem ceeb rau kev txheeb xyuas cov khoom siv tshuab-tsis txhob hla cov kauj ruam no thaum tau txais cov khoom:
Kev txheeb xyuas qhov tseeb: Hla- xyuas tias tus naj npawb cua sov, cov khoom siv tshwj xeeb (thickness, dav), thiab ntau npaum li cas ntawm MTR phim cov khoom siv tiag tiag thiab cov ntaub ntawv xa khoom (cov nqi thauj khoom, cov ntawv ntim khoom).
Kev Tshawb Xyuas Khoom Ua Raws Cai: Paub meej tias YS, TS, thiab elongation qhov tseem ceeb ntawm MTR tau ntsib lossis tshaj JIS G 3125 cov cai. Txheeb xyuas txoj kev xeem (piv txwv li, tensile test per JIS Z 2241) kom paub meej thoob ntiaj teb.
Kev kuaj xyuas qhov tseeb: Tsis lees paub MTRs nrog cov ntaub ntawv tsis pom kev, cov ntawv sau tsis sib xws, lossis tsis muaj npe kos npe / cim. Rau siab - xaj kom muaj nuj nqis, thov tus neeg muag khoom muab MTRs digital ua ntej rau kev tshuaj xyuas ua ntej.
3. Tshaj tawm-Daim ntawv txais nyiaj: Ntawm-Site Sampling & Third-Party Test
Rau cov haujlwm tseem ceeb lossis kom paub meej tias MTR qhov tseeb, ntawm - qhov chaw kuaj qhov chaw yog qhov tseem ceeb. Ua raws li cov lus qhia no rau kev yuav khoom txawv teb chaws:
Cov cai coj mus kuaj (Rau JIS Z 2201): Siv 1-2 tus qauv rau ib tus lej kub; rau batch ntau tshaj 100 tons, nce sampling rau 1 specimen ib 50 tons. Cov qauv yuav tsum raug coj los ntawm cov khoom sib txawv kom ntseeg tau tias muaj kev sawv cev.
Thib peb-Kev xaiv tog: Tso cai rau cov koom haum soj ntsuam thoob ntiaj teb muaj koob npe (xws li, SGS, Bureau Veritas) nrog cov chaw soj ntsuam hauv zos ntawm qhov chaw nres nkoj lossis qhov chaw ua haujlwm. Qhov no ua kom cov qhabnias xeem tau lees paub los ntawm cov tub ceev xwm hauv nroog thiab zam kev tsis sib haum xeeb ntawm tus neeg xa khoom- cov ntaub ntawv muab.
Kev lees txais: Yog tias qhov kev xeem tau ua tau raws li JIS G 3125 tus qauv, cov khoom siv tau txais. Yog tias ib qho kev ntsuas tsis ua tiav, nthuav cov qauv mus rau 3-5 tus qauv rau ib tus lej kub; yog tias muaj teeb meem tshwm sim, qhib cov ntawv cog lus tsis ua raws cai.
Tseem ceeb Pitfalls kom zam
Tsis txhob cia siab rau tus neeg muag khoom cov lus cog lus nkaus xwb -ib txwm tau txais cov khoom vaj khoom tsev thiab cov cai pov thawj hauv kev sau ntawv.
Tsis txhob sampling tsuas yog los ntawm qhov chaw los yog ib pob khoom xwb, vim qhov no yuav tsis cuam tshuam qhov zoo ntawm tag nrho cov khoom xa tuaj.
Tsis txhob ncua sijhawm pov thawj- tshuaj xyuas MTRs tam sim ntawd thaum xa khoom thiab ua tiav cov qauv ntsuas tsis pub dhau 7 hnub ua haujlwm kom ntseeg tau raws sijhawm rau qhov tsis ua raws li -.
Hauv cov ntsiab lus, kev txheeb xyuas SPA-H's mechanical properties in overseas bulk procurement need a phased approach: pre-procurement locking, delivery-time MTR review, and post-receipt sampling confirmation. Ua raws li cov txheej txheem no ua kom koj tau txais SPA raws cai-H Corten Steel, tso lub hauv paus ruaj khov rau kev nyab xeeb thiab kev ua haujlwm.
