GB/T 1591-2009 Qib C Longitudinal Submerged Arc Vuam (LSAW) Yeeb Nkab
Yog lawm,GB / T 1591-2009 Qib C steel yog cov khoom siv lees paub rau kev tsim Longitudinal Submerged Arc Welded (LSAW) kav. Qhov no sib raug rau covQ345C steel qib, uas muaj kev txhim kho qis - qhov kub thiab txias ua haujlwm nrog lav qhov cuam tshuam toughness ntawm0 degree, ua rau nws tsim nyog rau cov qauv siv hauv qhov chaw txias dua [citation: 2, citation: 7].
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 [citation: 2, citation: 3, citation: 5]. |
| Khoom Txheem | GB/T 1591-2009: Kub- dov qis- alloy cov qauv hlau. |
| Common Steel Qib | Q345C. Qhov "Q" sawv cev rau Yield Strength, "345" qhia qhov tsawg kawg nkaus tawm los lub zog hauv MPa, thiab "C" qhia txog qib zoo nrog rau cov kev cai cuam tshuam ntawm0 degree[qhia: 2, citation: 7]. |
| ** Chemical Composition (Ladle Analysis, max %) ** | |
| Cov pa roj carbon (C):Tsawg dua los yog sib npaug li 0.20 | |
| Silicon (Si):Tsawg dua los yog sib npaug li 0.50-0.55 | |
| Manganese (Mn): 1.00-1.70 | |
| Phosphorus (P):Tsawg dua lossis sib npaug li 0.035 | |
| Sulfur (S):Tsawg dua lossis sib npaug li 0.035 | |
| ** 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 Energy (Charpy V-notch):Ntau dua lossis sib npaug rau 34 Joules ntawm0 degree | |
| Hom Loj Ntau Yam [citation:5, citation:9] | |
| Sab nraud txoj kab uas hla:325mm txog 1820mm (kwv yees . 12" mus rau 72") | |
| Phab ntsa Thickness:5mm txog 50mm (cov phab ntsa tuab muaj nyob ntawm kev thov) | |
| Ntev:3m txog 18m (Customizable) | |
| Kev tsim khoom [citation: 3, citation: 5] | 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 dav [citation: 2, citation: 5, citation: 7] | Cov qauv kev txhawb nqa hauv cov huab cua txias; kev tsim kho choj; offshore platforms; piling foundations; qis -kua kua kis tau tus mob; machinery manufacturing; daim ntawv thov yuav tsum tau guaranteed 0℃cuam tshuam toughness. |
| Daim ntawv pov thawj | Mill Test Certificate feem ntau muab raws li EN 10204 / 3.1 lossis qhov xav tau ntawm qhov project [citation: 5, citation: 9]. |
📊 Q345 Qib Sib Piv
Tsev neeg Q345 muaj tsib qib zoo nrog kev tswj hwm nruj dua thiab cov kev xav tau cuam tshuam [citation: 2, citation: 7]:
| 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 - tseem ceeb, kev siv sab hauv tsev |
| Q345B | +20℃(34J min) | 0.040 | 0.040 | Kev tsim kho dav dav, kev siv huab cua me me |
| Q345C | 0℃(34J min) | 0.035 | 0.035 | Cov huab cua txias, cov qauv sab nraum zoov |
| Q345D | -20℃(34J min) | 0.030 | 0.030 | Qhov chaw txias txias |
| Q345E | -40℃(27J min) | 0.025 | 0.025 | Tsis txias txias, tseem ceeb infrastructure |
Qib Coccupies qhov nruab nrab txoj hauj lwm nyob rau hauv Q345 tsev neeg, muab guaranteed cuam tshuam toughness ntawm0 degreenrog nruj phosphorus thiab sulfur tswj (0.035% max txhua) piv rau Qib A thiab B [citation: 2, citation: 7].
🔍 Cov ntsiab lus tseem ceeb kom nkag siab
Lub ntsiab lus ntawm "Qib C": Hauv GB / T 1591-2009, tsab ntawv C qhia txog qib zoo uas yuav tsum tau muajCharpy V- ntsuas qhov cuam tshuam ntawm 0 degreenrog qhov tsawg kawg nkaus lub zog nqus ntawm 34 Joules. Qhov no ua rau nws haum rau cov qauv sab nraum zoov thiab cov ntawv thov hauv cov huab cua txias uas Qib B chav - qhov kub thiab txias ({3}}℃) tsis txaus [citation:2, citation:7].
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, Q345C tseem siv dav hauv kev lag luam thiab tseem tsim rau cov haujlwm raws li tus qauv qub.
Tshuaj muaj pes tsawg leeg: Qib C muaj phosphorus thiab sulfur txwv nruj dua (tsawg dua lossis sib npaug li 0.035% txhua) piv rau Qib A ( Tsawg dua lossis sib npaug li 0.045%) thiab Qib B (tsawg dua lossis sib npaug li 0.040%), pab txhawb kev txhim kho toughness thiab weldability.
Weldability: Q345C muaj qhov zoo tshaj plaws weldability vim nws cov kev tswj chemistry thiab qis carbon sib npaug, 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 [citation: 3, citation: 5].
💡 Thaum Xaiv Q345C Qib
XaivGB/T 1591-2009 Qib C (Q345C) LSAW yeeb nkabthaum [citation:2, citation:7]:
Cov qauv yuav raug nthuav tawmkub nyob ib ncig los yog qis dua khov (0 degree)
Daim ntawv thov yuav tsum tauguaranteed cuam tshuam toughness ntawm 0 degree
Cov phiaj xwm hauvtemperate rau cov huab cua txiasqhov twg Qib B chav- qhov ntsuas kub tsis txaus
Sab nraum zoov cov qauv, txuas hniav, thiab infrastructure nyob rau hauv cov cheeb tsam nrog lub caij ntuj no txias
Cov hauv paus hauv paus hauv thaj chaw uas muaj qhov kub thiab txias
Cov ntawv thov yuav tsum muaj zog dua qib B yam tsis muaj nqi ntawm Qib D lossis E
Rau feem ntau kev tsim kho hauv cov huab cua me me, Qib B (Q345B) yog qhov txaus thiab kev lag luam ntau dua. Rau qhov chaw txias txias hauv qab -20 degree, Qib D lossis E yuav tsum tau [citation:2, citation:7].
⚙️ Kev tsim khoom & Muaj
Cov qauv tsim khoom: Q345C LSAW kav feem ntau yog tsim los rau cov qauv khoom xws liGB/T 3091(rau qis -kua kua kis tau tus mob),GB/T 9711(rau daim ntawv thov pipeline), los yogAPI 5L[qhia: 2, citation: 5, citation: 9].
Qhov Loj Muaj: LSAW kav nyob rau hauv Q345C muaj nyob rau hauv ib tug ntau yam ntawm txoj kab uas hla (325 hli mus rau 1820 hli) thiab phab ntsa thicknesses (5 hli mus rau 50 hli), nrog rau ib co manufacturers muab cov loj loj nyob rau hauv kev thov [citation: 5, citation: 9].
Kev Tswj Xyuas Zoo: Cov txheej txheem tsim JCOE thiab UOE muab qhov tseeb qhov tseeb nrog tawm ntawm - ntawm - roundness kam rau ua ntawm ± 1% thiab qhov sib txawv ncaj tsawg dua lossis sib npaug li 0.2%. Tsis yog- kuaj kev puas tsuaj (ultrasonic, X-ray) thiab kev kuaj hydrostatic yog cov qauv ntsuas kev ruaj ntseg.
📝 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 cov kav dej Q345C LSAW tseem tuaj yeem siv 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 C (Q345C) LSAW yeeb nkabyog ib qho kev xaiv txhim khu kev qha rau cov qauv siv uas yuav tsum tau lav qhov cuam tshuam toughness ntawm0 degree, muab kev xaiv nruab nrab ntawm qhov dav dav - hom phiaj Qib B thiab txias - huab cua Qib D nrog kev txhim kho qis - qhov kub thiab txias [citation: 2, citation: 7].
