GB/T 1591-2009 Qib A Longitudinal Submerged Arc Vuam (LSAW) Yeeb Nkab
Yog lawm,GB / T 1591-2009 Qib A steel yog cov khoom siv lees paub rau kev tsim Longitudinal Submerged Arc Welded (LSAW) kav. Qhov no sib raug rau covQ345A steel qib, uas yog siv dav siv qis- alloy siab- lub zog cov qauv hlau hauv Suav teb rau kev tsim kho dav dav, cov qauv tsim hluav taws xob, thiab qis- cov ntaub ntawv siv hluav taws xob sib kis.
Cov ntsiab lus tseem ceeb tau sau tseg hauv cov lus hauv qab no:
Cov ntsiab lus tseem ceeb
| Yam ntxwv | Kev piav qhia |
|---|---|
| Yam khoom | Longitudinal Submerged Arc Welded (LSAW) Yeeb Nkab, tsim siv JCOE, UOE, lossis cov txheej txheem tsim zoo sib xws. |
| Khoom Txheem | GB/T 1591-2009: Kub- dov qis- alloy structural steels . |
| Common Steel Qib | Q345A. Tus "Q" sawv cev rau Yield Strength, "345" qhia qhov tsawg kawg nkaus yield zog hauv MPa, thiab "A" qhia txog qib zoo nrogtsis muaj kev qhia txog qhov yuav tsum tau ua . |
| Chemical Composition (Ladle Analysis, max %) | |
| Cov pa roj carbon (C): 0.20 | |
| Silicon (Si): 0.50-0.55 | |
| Manganese (Mn): 1.00-1.70 | |
| Phosphorus (P): 0.035-0.045 | |
| Sulfur (S): 0.035-0.045 | |
| Mechanical Properties (min) | |
| Yield Strength (t Tsawg dua los yog sib npaug rau 16mm):Ntau dua lossis sib npaug li 345 MPa | |
| Yield Strength (16mm |
|
| Tensile zog:470-630 MPa | |
| Elongation:Ntau dua lossis sib npaug li 21% | |
| Impact Test:Tsis xav tau rau Qib A. | |
| Hom Loj Loj | |
| Sab nraud txoj kab uas hla:219mm txog 2500mm + (kwv yees . 8" txog 100"+) | |
| Phab ntsa Thickness:5mm txog 50mm (cov phab ntsa tuab muaj nyob ntawm kev thov) | |
| Ntev:3m txog 18m (Customizable) | |
| Kev tsim khoom | 1. steel phaj xaiv thiab ntug milling. 2. Ntug crimping thiab tsim siv cov txheej txheem JCOE lossis UOE. 3. Sab hauv thiab sab nraud submerged arc vuam. 4. Mechanical expanding (rau UOE/JCOE). 5. Tsis yog- kuaj kev puas tsuaj (Ultrasonic, X-ray). 6. Kev ntsuas hydrostatic. 7. Xaus ntsej muag thiab beveling. |
| Cov ntawv thov siv | General structural engineering; kev tsim kho vaj tse; txuas txuas; tsheb thiab nkoj; machinery manufacturing; cov hlab ntsha siab thiab cov tank cia (tsis yog- tseem ceeb); nqa thiab thauj khoom; low-kwv dej kis tau tus mob. |
| Daim ntawv pov thawj | Mill Test Certificate feem ntau muab raws li EN 10204 / 3.1 lossis qhov xav tau ntawm qhov project. |
📊 Q345 Qib Sib Piv
Q345 tsev neeg muaj tsib qib zoo (A, B, C, D, E) nrog kev tswj hwm nruj dua thiab cov kev xav tau cuam tshuam:
| Qib | Impact Test Temperature | P max (%) | S max (%) | Daim ntawv thov tseem ceeb |
|---|---|---|---|---|
| Q345A | Tsis xav tau | 0.045 | 0.045 | Cov qauv dav dav, tsis yog- qhov tseem ceeb, sab hauv tsev, kev lag luam- tsav cov haujlwm . |
| Q345B | +20℃(27-34J) | 0.035-0.040 | 0.035-0.040 | Kev tsim kho dav dav, kev siv huab cua me me. |
| Q345C | 0℃(27-34J) | 0.030-0.035 | 0.030-0.035 | Cov huab cua txias, cov qauv sab nraum zoov. |
| Q345D | -20℃(27-34J) | 0.030 | 0.025-0.030 | Cov huab cua txias heev, thov kev thov. |
| Q345E | -40℃(27J) | 0.025 | 0.020 | Tsis txias txias, tseem ceeb infrastructure. |
Qib Ayog qhov kev xaiv pheej yig tshaj plaws hauv tsev neeg Q345, nrog rau kev tswj hwm tshuaj nruj me ntsis thiabtsis muaj kev cuam tshuam kev xeem yuav tsum tau. Qhov no ua rau nws tsim nyog rau cov ntawv thov uas qis -kub toughness tsis muaj kev txhawj xeeb.
🔍 Cov ntsiab lus tseem ceeb kom nkag siab
Lub ntsiab lus ntawm "Qib A": Hauv GB/T 1591-2009, tsab ntawv A qhia txog qhovfeem ntau theem pib zoo. Tsis zoo li Qib B txog E,Q345A tsis tas yuav muaj Charpy V- ntsuas qhov cuam tshuam, lub ntsiab lus nws toughness yog tsis guaranteed ntawm tej kub. Qhov no ua rau nws tsim nyog rau daim ntawv thov load static nyob rau hauv ib puag ncig.
Kev sib raug zoo rau Q355: Nco ntsoov tias GB / T 1591-2009 tau raug hloov los ntawmGB/T 1591-2018, uas hloov Q345 nrogQ355(tsawg kawg yield zog hloov mus rau 355 MPa). Txawm li cas los xij, Q345A tseem siv dav hauv kev lag luam thiab tseem tsim tawm rau cov haujlwm raws li tus qauv qub.
Chemical Composition Variation: Cov phosphorus thiab sulfur txwv rau Q345A tuaj yeem siab dua me ntsis (txog li 0.045%) piv rau cov qib siab dua, uas qhia txog nws cov theem pib zoo dua.
Weldability: Q345A muaj qhov zoo weldability vim nws qhov sib npaug ntawm cov pa roj carbon tsawg, ua rau nws tsim nyog rau cov txheej txheem vuam xws li submerged arc vuam (SAW), uas yog cov txheej txheem siv rau LSAW yeeb nkab tsim.
💡 Thaum Xaiv Q345A Qib
XaivGB/T 1591-2009 Qib A (Q345A) LSAW yeeb nkabthaum:
Daim ntawv thov suav nrogstatic loads xwbtsis muaj qhov tseem ceeb dynamic lossis cuam tshuam lub zog.
Kev khiav hauj lwm kub tsis tu ncuasaum toj no 0 degree(ambient sab hauv tsev lossis huab cua me me).
Qhov project yogtus nqi-sensitivethiab xav tau kev daws teeb meem kev lag luam.
Kev ntsuam xyuas cuam tshuam yogtsis xav taulos ntawm kev tsim tshwj xeeb lossis cov lej.
Daim ntawv thov suav nrogkev tsim cov khoom siv dav dav, cov qauv tsim, lossis qis - cov kua xa hluav taws xobnyob rau hauv ib puag ncig zoo.
Rau feem ntau ntawm kev tsim kho hauv cov huab cua me me, Qib A (Q345A) muab tus nqi - siv tau zoo. Rau cov ntawv thov uas yuav tsum tau lav qhov cuam tshuam rau qhov hnyav (cov qauv sab nrauv hauv cov huab cua txias, txuas hniav, cov hlab ntsha siab), cov qib siab dua xws li Q345C, D, lossis E yuav tsum tau teev tseg.
📝 Standard Update Note
GB/T 1591-2009tau supersed los ntawmGB/T 1591-2018, uas qhiaQ355raws li kev hloov rau Q345 nrog qhov tsawg kawg nkaus tawm lub zog ntawm 355 MPa. Nws raug nquahu kom paub meej tias xyoo twg yuav tsum muaj rau koj qhov project. Tam sim no kev tsim khoom ntawm Q345A LSAW kav dej kuj tseem siv tau rau xyoo 2009 tus qauv, tab sis cov khoom siv tseem ua tau raws li cov qauv tsim Q345.
Hauv cov ntsiab lus,GB/T 1591-2009 Qib A (Q345A) LSAW yeeb nkabyog qib qis tshaj plaws thiab kev lag luam hauv tsev neeg Q345, tsim nyog rau kev siv cov txheej txheem thiab kev tsim vaj tsev uas qis - qhov kub thiab txias tsis tas yuav tsum muaj qhov toughness.
