SA302GrB steel phaj qhia ntxaws qhia

1. Cov yam ntxwv ua tau zoo, kev siv thiab cov xwm txheej siv tau
SA302GrB yog ib qho tsis tshua muaj alloy high-strength manganese-molybdenum-nickel alloy steel phaj uas belongs rau ASTM A302 tus qauv thiab yog tsim los rau high-temperature thiab high-pressure khoom xws li cov hlab ntsha thiab boilers. Nws cov yam ntxwv tseem ceeb ntawm kev ua haujlwm muaj xws li:
Cov khoom siv zoo heev: tensile zog ≥550 MPa, yield zog ≥345 MPa, elongation ≥18%, thiab cuam tshuam toughness raws li ASTM A20 tus qauv.
Kev ua haujlwm vuam zoo: txhawb nqa phau ntawv arc vuam, submerged arc vuam, roj shielded vuam thiab lwm yam txheej txheem, thiab preheating thiab kev kho cua sov yuav tsum tau tom qab vuam kom tsis txhob tawg.
Qhov kub thiab txias tsis kam thiab corrosion kuj: Nyob ruaj khov nyob rau hauv kev khiav hauj lwm kub ntawm -20 ℃ to 450 ℃, haum rau corrosive media ib puag ncig xws li acids thiab alkalis.
Lub teeb yuag thiab lub zog siab: Los ntawm kev tsim cov alloying tsawg, thaum txo qhov hnyav ntawm cov qauv, lub siab muaj peev xwm txhim kho thiab cov khoom tsim khoom raug txo.
Cov xwm txheej siv tau: cov cuab yeej tseem ceeb hauv kev lag luam petrochemicals, fais fab nroj tsuag boilers, nuclear fais fab nroj tsuag, hydropower tsim, thiab lwm yam, xws li reactors, tshav kub exchangers, spherical tanks, nuclear reactor siab hlab ntsha, boiler nruas, thiab lwm yam.
2. Cov khoom tseem ceeb, kev ua haujlwm tsis zoo thiab cov khoom siv kho tshuab
Tshuaj muaj pes tsawg leeg (kev tshuaj ntsuam melting):
C (carbon): ≤0.25% (≤0.20% thaum thickness ≤25mm)
Mn (manganese): 1.07% -1.62% (1.15% -1.50% thaum thickness ≤25mm)
P (phosphorus): ≤0.035% (qee tus qauv xav tau ≤0.025%)
S (sulfur): ≤0.035% (qee tus qauv xav tau ≤0.025%)
Si (silicon): 0.13% -0.45%
Mo (molybdenum): 0.41% -0.64% (qee cov qauv xav tau 0.45% -0.60%)
Ni (nickel): 0.40% -0.70% (qee qhov thickness ntau)
Performance Parameters:
Tensile zog: 550-690 MPa (80-100 ksi)
Yield zog: ≥345 MPa (50 ksi)
Elongation: ≥15% thaum ntsuas qhov ntev yog 200mm, ≥18% thaum ntsuas qhov ntev yog 50mm
Kev kho cua sov hauv xeev: Kev xa tawm hauv normalizing, normalizing + tempering lossis tswj lub xeev dov, normalizing kev kho mob yuav tsum tau thaum thickness> 50mm.
Mechanical kev ua tau zoo:
Qhov sib npaug ntawm lub zog siab thiab toughness: Ntawm 550-690 MPa tensile lub zog, nws tseem tuav lub elongation ntawm ≥18%, xyuas kom cov cuab yeej muaj peev xwm tiv taus cov pob txha tawg.
Fine grain qauv: Ua tau raws li cov qoob loo loj uas yuav tsum tau ua ntawm A20 / A20M tus qauv thiab txhim kho qhov kub thiab txias cuam tshuam rau lub zog.
3. Cov ntaub ntawv thov thiab qhov zoo
Petrochemical kev lag luam:
Cov ntaub ntawv thov: Lub tuam txhab petrochemical siv SA302GrB steel daim hlau los tsim cov tshuab hluav taws xob siab, uas tau ua haujlwm tsis tu ncua rau 5 xyoos ntawm 400 ℃ thiab 30 MPa yam tsis muaj qhov tawg lossis deformation.
Qhov zoo: Kev tiv thaiv zoo heev rau hydrogen corrosion, thiab 100% ultrasonic tsis pom kev ntawm welds ua kom cov cuab yeej muaj kev nyab xeeb.
Nuclear fais fab nroj tsuag teb:
Daim ntawv thov rooj plaub: Lub reactor siab hlab ntsha ntawm lub nuclear fais fab nroj tsuag txais SA302GrB steel phaj nrog ib tug tuab ntawm 120 hli. Los ntawm normalizing + tempering kev kho mob, cov hluav taws xob tiv thaiv yog txhim kho los ntawm 30%.
Qhov zoo: Molybdenum cov ntsiab lus ntawm 0.45% -0.60% inhibits neutron irradiation embrittlement thiab ua tau raws li cov kev cai ntawm ASME specifications.
Chaw nres tsheb fais fab boiler teb:
Cov ntaub ntawv thov: Ib lub tshuab boiler supercritical tau txais SA302GrB steel phaj, uas ua haujlwm ntawm 540 ℃ thiab 25 MPa, thiab nws lub neej kev pabcuam txuas mus rau 30 xyoo.
Advantage: Kub kub lub sij hawm luv luv lub zog ncav cuag 690 MPa, uas yog 15% sib dua li carbon steel thiab txo lub zog noj.
Hydropower tsim teb:
Daim ntawv thov rooj plaub: Cov yeeb nkab dej siab ntawm qhov chaw nres tsheb hydropower txais SA302GrB steel phaj thiab dhau 200,000 kev sim qaug zog hauv ib puag ncig ntawm -20 ℃ txog 50 ℃.
Advantage: Tsawg kub cuam tshuam toughness (≥27 J ntawm -20 ℃) ​​ua tau raws li qhov xav tau huab cua huab cua ntawm thaj chaw roob.
4. Kev nyab xeeb, kev tiv thaiv ib puag ncig thiab kev lag luam tseem ceeb
Kev nyab xeeb:
Dhau ASTM A20 qhov kev ntsuam xyuas qhov cuam tshuam (V-notch cuam tshuam lub zog ≥34 J ntawm -20 ℃), kom ntseeg tau tias qhov kev pheej hmoo ntawm qhov kub thiab txias tawg yog tsawg dua 0.1%.
Lub hardness ntawm tshav kub-cuam tshuam cheeb tsam ntawm weld yog ≤350 HV los tiv thaiv hydrogen-induced cracking.
Kev tiv thaiv ib puag ncig:
Cov ntsiab lus molybdenum ntawm 0.41% -0.64% txo kev siv cov nickel thiab txo cov hlau hnyav.
Ua raws li EU RoHS cov lus qhia thiab txwv tsis pub siv cov khoom tsis zoo xws li txhuas thiab mercury.
Kev lag luam tseem ceeb:
Nws suav txog 25% ntawm lub ntiaj teb siab lub nkoj steel phaj lag luam thiab yog cov khoom siv tseem ceeb rau thaj chaw ntawm lub zog nuclear thiab cov khoom siv petrochemical.
Txhawb kev siv ntau yam kub ntawm -20 ℃ to 450 ℃, thiab txhim kho cov cuab yeej ua haujlwm tau zoo los ntawm 15% -20% piv nrog cov pa roj carbon monoxide.
Xaus
SA302GrB steel phaj tau dhau los ua cov khoom tseem ceeb ntawm cov khoom siv niaj hnub muaj kub thiab cov khoom siv siab vim nws lub zog siab, corrosion kuj thiab vuam yooj yim. Nws qhov sib npaug ntawm kev nyab xeeb, kev tiv thaiv ib puag ncig thiab kev siv nyiaj txiag ua rau nws hloov tsis tau hauv thaj chaw ntawm nuclear fais fab, petrochemicals, lub zog, thiab lwm yam, thiab nws yog tsav kev tsim cov cuab yeej siv rau kev ua haujlwm zoo thiab kev nyab xeeb dua.