Txheej txheem cej luam ntawm P355NL1 High-Strength Fine-Grain Steel rau Boiler thiab Pressure Vessel Applications
P355NL1yog anormalized, siab -lub zog, zoo- steel hlautsim rau welded siab cov cuab yeej nyob qhov twgsiab zog ua ke nrog guaranteed notch toughness ntawm tsawg kubyog yuav tsum tau. Nws lub npe ua raws li European tus qauvTS EN 10028-3, muab tso rau nws raws li cov khoom lag luam zoo nyob rau hauv qhov zoo li qub -grain steel tsev neeg rau kev thov.
Lub npe tawg:
P:Lub hom phiaj siab
355:Yam tsawg kawg nkaus yield zog (ReH) hauv MPa ntawm chav tsev kub
N:Normalized khoom xa tuaj
L1:Haum rauTsawg-kev pabcuam kub, nrog "1" qhia txog qib toughness zoo dua(feem ntau kuaj ntawm -50℃lossis qis dua, nyob ntawm thickness / subgrade).
Qib no ua tiav nws lub zog siab dua (piv rau P265NL) los ntawm kev ua tib zoo sib npaug ntawm cov tshuaj muaj pes tsawg leeg, feem ntau suav nrog micro-alloying ntsiab xws li Niobium (Nb) lossis Vanadium (V). CovnormalizingKev kho cua sov kom ua kom zoo zoo, homogeneous grain qauv, uas yog qhov tseem ceeb rau nwszoo heev uas tsis tshua muaj - kub cuam tshuam toughnessthiab zoo weldability. Nws yog cov khoom ntawm kev xaiv thaum tsim kev kub ntxhov lossis kev thauj khoom yuav tsum muaj lub zog siab dua li P265NL tuaj yeem muab tau, yam tsis muaj kev cuam tshuam rau cov qib kim kim quenched & tempered (QL).
Cov ntawv thov tseem ceeb:
Siab- cov nkoj cia siab rau cov pa roj (xws li cov pa roj, CNG).
Cov hlab ntsha tseem ceeb thiab cov boilers nyob rau hauv cov tshuaj, petrochemical, thiab roj & roj industries.
Loj - cov kav dej thiab cov penstocks rau hydropower thiab dej xa mus.
Offshore cov qauv thiab cov qauv uas xav tau lub zog siab thiab txias - kev ua haujlwm huab cua.
Cheebtsam qhov twg qhov hnyav txo yog ib qho tseem ceeb tab sis lub xeev quenched & tempered tsis raug cai.
Khoom Specification thiab Khoom ntawm P355NL1
Cov lus hauv qab no qhia txog cov ntaub ntawv tseem ceeb rau P355NL1 steel raws li EN 10028-3. Nws yog ibphaj khoomsiv rau fabricating welded Cheebtsam xws li cov kav dej thiab plhaub.
Table 1: P355NL1 Steel Phaj Specification Summary (EN 10028-3)
| Qeb | Specification / Hom Tus Nqi |
|---|---|
| Kev tswj hwm tus qauv | TS EN 10028-3:Cov khoom tiaj tus ua los ntawm cov hlau rau lub hom phiaj siab - Ntu 3: Weldable fine grain steels, normalized. |
| Daim ntawv khoom | Feem ntauHlau Phaj. |
| Kev Xa Khoom | Normalized (N)- Qhov tseem ceeb rau kev ua tiav cov cuab yeej cuab tam thiab toughness. |
| Kwv yees International Equivalents | ASTM / ASME:A516/A516M Qib 70 (ib qho sib npaug ntawm lub zog thiab qis-temp daim ntawv thov, txawm tias chemistry yuav txawv). ISO 9328-2:P355NL1. DIN/EN:1.0565 (lub npe qub). |
| Chemical Composition (Kev Ntsuas Kub, max %) | C:Tsawg dua lossis sib npaug li 0.18%,Si:Tsawg dua lossis sib npaug li 0.60%,Mn:Tsawg dua lossis sib npaug li 1.70%,P:Tsawg dua lossis sib npaug li 0.025%,S:Tsawg dua lossis sib npaug li 0.015%,Alt (tag nrho aluminium):Ntau dua lossis sib npaug li 0.020%.Feem ntau micro-alloyed nrog Niobium (Nb) thiab/los yog Vanadium (V). |
| Mechanical Properties (ntawm chav tsev kub) | Yield zog (ReH):Ntau dua lossis sib npaug355 MPa rau Tensile zog (Rm):470 - 630 MPa Elongation ntawm Break (A):Ntau dua lossis sib npaug li 22% (min., ntawm qhov ntsuas qhov ntev Lo=5.65√So) |
| Cov yam ntxwv tseem ceeb | Guaranteed High Impact Toughness ntawm qis kub.Cov "L1" kev xaiv feem ntau sib raug rau aCharpy V-qhov ntsuas kub ntawm -50℃(-58℃F), nrog qhov tsawg kawg nkaus qhov nruab nrab qhov yuav tsum tau muaj zog (piv txwv li, 40 J lossis 50 J, nyob ntawm sub- qib thiab tuab). |
| Main Advantage | Kev sib xyaw ua ke zoo tshaj plaws ntawm lub zog siab, zoo heev qis -kub toughness, thiab weldability zoonyob rau hauv ib tug normalized mob, zam lub complexity thiab tus nqi ntawm quenching & tempering. |
| Cov ntawv thov rau cov yeeb nkab / raj | Fabricated loj- txoj kab uas hla cov kav dej rau siab- cov pa xa hluav taws xob siab, cov twj tso kua mis, cov hlab ntsha siab thiab lub plhaub boiler rau qis- qhov kub thiab txias, kev pab cuam offshore. |
Table 2: Fabrication and Application Notes for P355NL1
| Yam | Cov Lus Qhia thiab Cov Lus Qhia |
|---|---|
| Vuam | Zoo weldability, tab sis xav tau kev saib xyuas ntau dua li qis dua - qib zog xws li P235GH vim nws cov pa roj carbon ntau dua (CEV). Kev siv ntawmqis- cov txheej txheem hydrogen vuam thiab cov khoom sivyog yuav tsum tau.Preheating(feem ntau yog 100-150 degree, nyob ntawm qhov tuab thiab kev txwv) tau pom zoo kom tiv thaiv kom tsis txhob muaj dej txias los ntawm kev tawg. Welding Procedure Specifications (WPS) yuav tsum tsim nyog. |
| Tshaj tawm -Kev kho cua sov (PWHT) | Feem ntau xav tau lossis pom zoorau cov ntu tuab thiab rau cov ntawv thov tseem ceeb los daws cov kev ntxhov siab seem thiab rov ua kom tawv nqaij hauv tshav kub- thaj tsam cuam tshuam (HAZ). PWHT tsis tuaj yeem yuav tsum tau tswj kom tsis txhob cuam tshuam lub hauv paus hlau cov khoom qub. |
| tsim | Zoo kub sib sau zog. Txias txoj kev tuaj yeem ua tau tab sis yuav xav tau kev ntxhov siab ntxiv tom qab yog tias qhov deformation hnyav, kom tsis txhob muaj kev laus thiab tsis muaj zog. |
| Kev Pabcuam Kub | Tsis yog rau siab -kub creep kev pabcuam.Qhov siab tshaj plaws qhov kev pab cuam qhov kub thiab txias yog feem ntau nyob ib ncig ntawm350-400℃(660-750℃F). Txhawm rau tiv thaiv qhov kub thiab txias, cov hlau alloy yuav tsum tau xaiv. |
| Sib piv nrog Lwm Qib | vs P265 NL:P355NL1 muaj kwv yees li 90 MPa siab dua qhov qis tshaj tawm lub zog, tso cai rauthinner phab ntsa thiab qhov hnyav txuagnyob rau hauv siab -pressure designs. Ob leeg lav qis-kub toughness. vs P355N / P355NH:Qhov "NL1" version tau lav qhov cuam tshuam rau qhov hnyav, qhov "N / NH" qib yog rau qhov kev pab cuam qhov kub thiab txias yam tsis muaj qhov qis -temp toughness. vs P355QL1 (Quenched & Tempered):P355QL1 muaj lub zog ntau dua thiab / lossis tawv tawv ntawm qhov kub thiab txias tab sis ntawm tus nqi siab dua thiab nrog kev nruj dua vuam thiab kev kho cua sov. |
Lus Cim Tseem Ceeb:Cov ntaub ntawv no yog siv rau kev siv. Rau kev tsim thiab kev yuav khoom, qhov ua tiav thiab qhov tseeb version ntawm lubTS EN 10028-3tus qauv thiab cov txheej txheem tsim cov cuab yeej siv siab (xws li EN 13445, ASME BPVC) yuav tsum tau sab laj. Kev xaiv cov ntaub ntawv yuav tsum yog raws li daim ntawv pov thawj Tshuaj thiab Mechanical Test Report (piv txwv li, EN 10204 3.1 lossis 3.2).
