Lub zog tawm los yog lub hauv paus ntawm cov qauv hlau tsim- nws txiav txim siab qhov siab tshaj plaws ntawm cov khoom siv tuaj yeem dais yam tsis muaj deformation mus tas li, cuam tshuam ncaj qha rau txoj haujlwm kev nyab xeeb thiab kev thauj khoom- cov kabmob muaj peev xwm. Rau Q235NH Corten Steel, tus nqi - huab cua zoo- qib tiv thaiv tau siv dav hauv kev tsim vaj tsev engineering, qhia meej txog nws qhov kev tawm los tsawg kawg ntawm chav tsev kub yog qhov tseem ceeb rau cov engineers thiab fabricators. Tus nqi tseem ceeb no yog dab tsi, thiab nws ua li cas thiaj li coj tau cov kev siv tswv yim? Rooted hauv GB / T 4171 cov qauv thiab cov ntaub ntawv kuaj kev lag luam, cov ntsiab lus tseem ceeb yog qhov tseeb:Qhov tsawg kawg nkaus lub zog ntawm Q235NH Corten Steel ntawm chav tsev kub (20 degree) yog 235 MPa, tus nqi nruj tswj hwm los ntawm Suav cov qauv thiab ua raws li cov qauv khoom siv.. Hauv qab no yog ib qho yooj yim, kev txiav txim siab tawg.
Cov ntsiab lus tseem ceeb: Yield Strength & Engineering tseem ceeb
Yield zog yog hais txog kev ntxhov siab uas cov khoom hloov pauv ntawm elastic deformation (rov qab tau) mus rau cov yas deformation (mus tas li). Rau cov khoom tsim los ntawm Q235NH-xws li guardrails, tsev facades, thiab me me txuas hniav- tus nqi no tsis yog- sib tham:
Nws teeb tsa cov kev txwv sab sauv rau kev nyab xeeb tsim qauv, tiv thaiv cov qauv deformation lossis tsis ua haujlwm thaum lub sijhawm ua haujlwm.
Chav ntsuas kub (20 degree) yog lub hauv paus rau kev sim, raws li nws ua raws li cov kev khiav hauj lwm ib puag ncig ntawm feem ntau Q235NH daim ntawv thov (kub thaj tsam).
Standard Basis & Test Method
Q235NH qhov tsawg kawg nkaus yield zog ntawm 235 MPa yog yuam los ntawm Tuam Tshoj tus GB / T 4171 《Weathering structural steels express, nrog nruj soj ntsuam raws tu qauv kom ua raws li:
Kev xeem Standard: Kev ntsuas tensile yog ua los ntawm GB / T 228 《Metallic material - Tensile testing - Part 1: Method of test at room temperature express, using standard specimens cut from Q235NH plates or sections.
Kev Xeem: Cov qauv raug kuaj ntawm 20℃± 5 degree, nrog rau kev thauj khoom sib npaug kom txog thaum cov yas deformation tshwm sim. Qhov taw tes tawm los yog sau tseg raws li qhov tsawg kawg nkaus kev ntxhov siab kom ua rau lub cev deformation mus tas li (0.2% offset txoj kev yog tias tsis muaj qhov pom tseeb tawm los).
Quality Assurance: Cov neeg muab khoom siv yuav tsum muab daim ntawv qhia txog kev xeem zeb (MTR) kom paub meej tias txhua qhov kev sib tw lub zog ua tau raws li lossis siab tshaj 235 MPa, nrog rau daim ntawv pov thawj ua raws li GB / T 4171.
Tej yam uas yuav cuam tshuam rau Yield Strength
Raws li cov txheej txheem muab khoom, Q235NH lub zog tawm los yog qhov ruaj khov, tab sis ob yam tuaj yeem ua rau muaj kev hloov pauv me me (tseem nyob rau hauv qhov txwv tau txais):
Thickness: Rau cov phaj tuab dua 25 hli, lub zog tawm los yuav txo qis me ntsis (los ntawm 5-10%) vim tias qeeb qeeb qeeb thaum dov. Txawm li cas los xij, nws tseem nyob ntau dua lossis sib npaug li 235 MPa ib GB / T 4171.
Kev Siv Tshuab: Thermo-mechanical controlled rolling (TMCP) txhim khu cov nplej refinement, pab tuab daim hlau tswj cov yield zog stability. Raws li - dov daim hlau tej zaum yuav muaj me ntsis qis tab sis ua raws li qhov tseem ceeb.
Cov Lus Qhia Txog Kev Siv Tau
Nkag siab txog qhov tsawg kawg nkaus 235 MPa lub zog tawm los qhia kev nyab xeeb thiab tus nqi - tsim tau zoo:
Load Design: Siv qhov kev nyab xeeb ntawm 1.5-1.8 rau kev thauj khoom zoo li qub (piv txwv li, lub tsev facades) thiab 2.0-2.2 rau dynamic loads (piv txwv li, txoj kev loj guardrails) kom suav rau ib puag ncig kev ntxhov siab thiab cov khoom sib txawv.
Kev xaiv khoom: Q235NH yog haum rau qis- mus rau - nruab nrab load qauv. Rau hnyav- thauj khoom (piv txwv li, choj piers), xaiv qhov siab dua - qib zog xws li Q355NH (min yield zog 355 MPa).
Vuam cuam tshuam: Kev vuam zoo (tsawg cua sov input, 80-120℃preheating rau tuab daim hlau) ua kom cov pob qij txha ruaj khov ntau dua lossis sib npaug li 90% ntawm lub hauv paus hlau yield zog, tsis txhob muaj zog poob.
Kev sib piv nrog Zoo li Corten Steels
Lub 235 MPa tawm los lub zog ua haujlwm Q235NH raws li kev xaiv nyiaj txiag piv rau siab dua - huab cua muaj zog- cov hlau tsis muaj zog:
Q355NH: Min yield zog 355 MPa, siab dua load peev tab sis 15-20% tus nqi siab dua.
S355K2W (EN 10025-5): Min yield zog 355 MPa, zoo ib yam li Q355NH tab sis optimized rau ultra-low kub.
Nyob rau hauv cov ntsiab lus, Q235NH Corten Steel qhov tsawg kawg nkaus tawm lub zog ntawm chav tsev kub yog ib tug standardized 235 MPa, tswj los ntawm GB/T 4171. Qhov no tus nqi txhais nws lub luag hauj lwm nyob rau hauv qis - mus rau - nruab nrab load sab nraum zoov qauv, ntsuas tus nqi -effectiveness thiab structural kev ruaj ntseg. Los ntawm kev txhim kho cov qauv tsim nrog qhov kev txwv lub zog no thiab suav nrog cov thickness / kev ua haujlwm, cov kws ua haujlwm tuaj yeem ua kom cov khoom siv tau zoo tshaj plaws.
