GB / T 1591-2009 Qib B steel yog cov khoom siv dav dav thiab dav siv rau kev tsim Longitudinal Submerged Arc Welded (LSAW) kav. Qhov no sib raug rau covQ345B steel qib, uas yog qhov qis- alloy siab- lub zog cov qauv hlau feem ntau siv hauv kev tsim kho, cov qauv tsim vaj tsev, thiab qis- cov ntawv thov kev sib kis ntawm cov kua dej.
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 1591-2008: Kub- dov qis- alloy structural steels (Ceeb toom: tus qauv tooj qhia 2008 hauv qhov chaw, txawm tias 2009 tau hais hauv koj cov lus nug). |
| Common Steel Qib | Q345B. Tus "Q" sawv cev rau Yield Strength, "345" qhia qhov tsawg kawg nkaus tawm los lub zog hauv MPa, thiab "B" qhia txog qib zoo nrog rau cov kev cai cuam tshuam ntawmchav tsev kub (+20 degree) . |
| 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 0.55 | |
| Manganese (Mn): 1.00-1.60 | |
| Phosphorus (P):Tsawg dua lossis sib npaug li 0.040 | |
| Sulfur (S):Tsawg dua lossis sib npaug li 0.040 | |
| Vanadium (V): 0.02-0.15 | |
| Niobium (Nb): 0.015-0.060 | |
| Titanium (Ti): 0.02-0.20 | |
| 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 |
|
| Yield Strength (35mm |
|
| Yield Strength (50mm |
|
| 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 ntawm+20 degree . | |
| Hom Loj Loj | |
| Sab nraud txoj kab uas hla:20 hli txog 610 hli (qhov loj dua tuaj yeem muaj los ntawm qee cov tuam ntxhab) | |
| Phab ntsa Thickness:4mm rau 70mm | |
| Ntev:4m txog 12m (Customizable) | |
| Kev tsim khoom | 1. steel phaj xaiv thiab ntug milling. 2. Kev tsim siv JCOE lossis UOE cov txheej txheem. 3. Sab hauv thiab sab nraud submerged arc vuam. 4. Mechanical expanding (rau UOE/JCOE). 5. Tsis yog -kev kuaj kev puas tsuaj. 6. Kev ntsuas hydrostatic. 7. Xaus ntsej muag thiab beveling. |
| Cov ntawv thov siv | Tsawg- cov kua xa tawm siab (dej, roj, roj); structural Cheebtsam hauv kev tsim kho; txuas txuas; machinery manufacturing; kev thauj mus los ntawm cov dej tsawg-siab; General engineering cov qauv. |
| 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 ntau qib zoo nrog kev tswj hwm nruj dua thiab cov kev xav tau cuam tshuam:
| Qib | Impact Test Temperature | Daim ntawv thov tseem ceeb |
|---|---|---|
| Q345A | Tsis xav tau | Cov qauv dav dav, tsis yog - tseem ceeb, kev siv sab hauv tsev |
| Q345B | +20℃(34J min) | Kev tsim kho dav dav, kev siv huab cua me me |
| Q345C | 0℃(27-34J) | Cov huab cua txias, cov qauv sab nraum zoov |
| Q345D | -20℃(27-34J) | Qhov chaw txias txias |
| Q345E | -40℃(27J) | Tsis txias txias, tseem ceeb infrastructure |
Qib Byog qib feem ntau teev nyob rau hauv tsev neeg Q345, muab qhov zoo sib npaug ntawm lub zog, weldability, thiab nqi nrogguaranteed cuam tshuam toughness ntawm chav tsev kub (+20 degree) .
🔍 Cov ntsiab lus tseem ceeb kom nkag siab
Lub ntsiab lus ntawm "Qib B": Hauv GB/T 1591-2008, tsab ntawv B qhia txog qib zoo uas yuav tsum tau muajCharpy V- ntsuas qhov cuam tshuam ntawm +20 degreenrog qhov tsawg kawg nkaus lub zog nqus ntawm 34 Joules. Qhov no ua rau nws tsim nyog rau kev siv kev tsim kho dav dav uas xav tau qee qhov kev cuam tshuam.
Kev sib raug zoo rau Q355: Nco ntsoov tias GB / T 1591-2008 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, Q345B tseem siv dav hauv kev lag luam thiab tseem tsim rau cov haujlwm raws li tus qauv qub.
Micro-Alloying Elements: Q345B muaj me me ntxiv ntawm vanadium, niobium, thiab titanium (0.02-0.20%) uas ua rau cov nplej refinement thiab txhim kho txhua yam khoom.
Weldability: Q345B muaj qhov zoo weldability vim nws cov chemistry tswj, ua rau nws haum rau cov kev siv vuam xws li submerged arc vuam (SAW), uas yog cov txheej txheem siv rau LSAW yeeb nkab manufacturing.
💡 Thaum Xaiv Q345B Qib
XaivGB/T 1591-2008 Qib B (Q345B) LSAW yeeb nkabthaum:
Daim ntawv thov yuav tsum tauguaranteed cuam tshuam toughness ntawm chav tsev kub(+20 degree)
General kev tsim kho thiab engineering tej yaam num nyob rau hauvkev nyab xeeb me ntsis
Tsawg- cov kab xa hluav taws xob siab xav tau lub zog siab dua li carbon steel
Cov yam ntxwv ntawm cov khoom raugnruab nrab dynamic loads
Tus nqi - cov haujlwm tseem ceeb xav tau asib npaug ntawm kev ua tau zoo thiab kev lag luam
Rau feem ntau kev tsim kho thiab kev siv engineering, Qib B (Q345B) muab kev pom zoo ua ke ntawm lub zog, toughness, thiab tus nqi -kev ua tau zoo . Rau cov ntawv thov uas xav tau kev lees paub qis - qhov kub thiab txias, qib siab dua xws li Q345C, D, lossis E yuav tsum tau teev tseg.
Hauv cov ntsiab lus,GB/T 1591-2008 Qib B (Q345B) LSAW yeeb nkabyog qib uas tau teev tseg ntau tshaj plaws hauv tsev neeg Q345, muab lub zog ruaj khov thiab lav chav - qhov kub thiab txias cuam tshuam rau ntau yam ntawm cov qauv thiab cov dej sib kis.
