Txheej txheem cej luam
20MnG yog tus qauv Suavsiab - zoo carbon manganese steeltshwj xeeb yog tsim los rau kev tsim cov siab - siab boiler raj thiab kav dej. Tus "G" hauv nws lub npe sawv cev rau "Gao Ya Gua" (高压锅), uas txhais tau tias "siab- siab boiler."
Cov hlau no yog cov khoom siv ua haujlwm hauv lub zog tsim hluav taws xob thiab kev lag luam boiler, muaj nuj nqis rau nws cov kev sib xyaw ua ke zoo heev ntawm lub zog, toughness, thiab weldability ntawm qhov kub siab.
Ntsiab Specifications thiab Standards
20MnG feem ntau yog tswj hwm los ntawm Suav National Standard:
GB/T 5310 - High Pressure Boiler Seamless Tubes
Cov qauv no qhia txog cov kev xav tau nruj rau cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, tsis yog - kev kuaj kev puas tsuaj, thiab qhov ntev ntev uas cov kav dej no yuav tsum tau ua kom muaj kev nyab xeeb hauv qhov tseem ceeb ntawm - siab, siab - kev siv kub.
Tshuaj muaj pes tsawg leeg
Cov tshuaj muaj pes tsawg leeg yog nruj tswj xyuas kom ntseeg tau tias kev ua haujlwm zoo ib yam. Ib qho kev sib xyaw ua ke yog raws li hauv qab no (los ntawm qhov hnyav %):
| Element | Cov ntsiab lus (%) |
|---|---|
| Cov pa roj carbon (C) | 0.17 - 0.24 |
| Silicon (Si) | 0.17 - 0.37 |
| Manganese (Mn) | 0.70 - 1.00 |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025 |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.015 |
| Chromium (Cr) | Tsawg dua lossis sib npaug li 0.25 |
| Nickel (Ni) | Tsawg dua lossis sib npaug li 0.25 |
| Copper (Cu) | Tsawg dua los yog sib npaug li 0.20 |
Vim li cas nws tseem ceeb:Qhov sib npaug ntawm cov pa roj carbon thiab ntau dua manganese muab lub zog zoo thiab tawv. Qhov qis ntawm Phosphorus thiab Sulfur (impurities) yog qhov tseem ceeb rau kev txhim kho weldability thiab tsis kam mus rau embrittlement.
Mechanical Properties
Cov khoom siv kho tshuab tau lees paub los ntawm cov chaw tsim khoom thiab feem ntau yog raws li hauv qab no tom qab kev kho cua sov tsim nyog (normalizing lossis normalizing + tempering):
| Khoom | Tus nqi |
|---|---|
| Tensile zog (Rm) | Ntau dua lossis sib npaug rau 410 MPa (Min) |
| Yield zog (Rp0.2) | Ntau dua lossis sib npaug rau 245 MPa (Min) |
| Elongation (A) | Ntau dua lossis sib npaug li 24% |
| Impact Zog | Ua tau raws li tus qauv xav tau |
Cov yam ntxwv tseem ceeb & qhov zoo
Siab -Tsub Muaj Zog:Nws tuav nws cov neeg kho tshuab kev ncaj ncees thiab tiv thaiv kev nkag mus (qeeb deformation nyob rau hauv qhov kev ntxhov siab tas li) ntawm kev ua haujlwm kub ntawm boilers thiab superheaters.
Zoo Weldability:Qhov sib npaug ntawm cov pa roj carbon tsawg ua rau nws yooj yim rau vuam yam tsis muaj ua ntej- cua sov lossis tom qab- vuam kev kho cua sov hauv ntau qhov xwm txheej, txawm tias cov txheej txheem tseem yuav tsum tau ua tib zoo tswj.
Zoo heev Toughness:Nws muaj kev cuam tshuam zoo, uas yog qhov tseem ceeb rau kev tiv thaiv kev ua haujlwm kev ntxhov siab thiab kev hloov pauv siab.
Zoo Oxidation Resistance:Nws tsim ib txheej oxide ruaj khov uas tiv thaiv qhov ntsuas kub ntawm qhov nruab nrab.
Tus nqi -zoo:Piv nrog rau qis- alloy steels xws li 15CrMoG lossis 12Cr1MoVG, 20MnG yog kev lag luam ntau dua thaum muab kev ua haujlwm txaus rau ntau daim ntawv thov boiler.
Cov ntawv thov siv
20MnG cov kav dej yog siv nyob rau hauv qhov tseem ceeb ntawm cov tshuab boiler uas ua haujlwm ntawm kev kub siab thiab kub, suav nrog:
Superheater Tubes:Qhov twg saturated chav yog ntxiv rhuab mus ua superheated chav.
Reheater Tubes:Reheats chav tom qab nws tau nthuav ib nrab los ntawm lub turbine.
Dej Phab Ntsa Tubes:Cov phab ntsa ntawm lub cub tawg qhov twg dej yog cua sov thiab tig mus rau hauv chav.
Main Steam Pipes & Headers:Cov kav loj - txoj kab uas hla uas nqa cov pa ntawm lub boiler mus rau lub turbine.
Economizer Tubes:Ua ntej- heats cov feedwater siv khib nyiab los ntawm cov pa taws.
Sib piv nrog Lwm Qib
vs. 20# Steel (GB/T 8163):Thaum 20 # yog cov pa roj carbon ntau rau kev thauj cov dej, 20MnG yog qib siab dua. Nws muaj kev tswj xyuas nruj dua ntawm cov tshuaj lom neeg muaj pes tsawg leeg thiab impurities, yuav tsum tsis yog -kev kuaj kev puas tsuaj, thiab lav siab siab - cov khoom kub.20# tsis yog ib qho kev hloov pauv ncaj qha rau siab - siab boiler daim ntawv thov.
ASTM A106 Gr.B:Qhov no yog ib qho tseem ceeb tshaj plaws hauv Teb Chaws Asmeskas tus qauv rau siab -kev pabcuam kub. 20MnG feem ntau suav tias yog qhov sib npaug ntawm A106 Qib B raws li nws cov tshuaj thiab cov khoom siv kho tshuab.
Kev tsim khoom thiab kev sim
Cov kav dej tsim los rau GB / T 5310 tau txais kev tswj xyuas zoo:
Seamless Txheej Txheem:Feem ntau ua los ntawm kub extrusion los yog tho los xyuas kom meej ib homogeneous, leak- qauv pov thawj.
Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT):100% ntawm cov kav dej tau raug kuaj ultrasonic lossis ntsuas tam sim no txhawm rau txheeb xyuas qhov tsis xws luag sab hauv thiab saum npoo.
Kev Ntsuas Hydrostatic:Txhua lub yeeb nkab raug sim rau qhov kev ntsuas siab kom ntseeg tau tias nws tuaj yeem tiv taus nws qhov ntsuas kev ua haujlwm siab.
Flating Test, Flaring Test, thiab lwm yam:Cov kev ntsuam xyuas ntxiv los xyuas kom meej qhov ductility thiab formability.
Cov ntsiab lus
20MnG carbon steel boiler yeeb nkabyog ib qho kev txhim khu kev qha, tus qauv, thiab tus nqi- cov khoom siv tau zoo tshwj xeeb tsim los rau qhov xav tau ib puag ncig ntawm siab - siab boilers hauv cov chaw tsim hluav taws xob thiab chaw tsim khoom. Nws qhov sib npaug sib npaug ua kom muaj kev sib xyaw ua ke ntawm lub zog, weldability, thiab ntev - lub sijhawm ua haujlwm ntawm qhov kub siab, ua rau nws yog ib qho tseem ceeb ntawm lub tsev thaiv ntawm thermal zog tsim infrastructure.
