SA302GrB steel phaj cov lus qhia ntxaws ntxaws

1. Cov yam ntxwv ntawm kev ua tau zoo, kev siv thiab cov xwm txheej siv tau
SA302GrB yog cov hlau tsis tshua muaj zog manganese-molybdenum-nickel alloy steel phaj uas yog ASTM A302 tus qauv thiab tsim los rau cov khoom siv kub thiab siab xws li cov hlab siab thiab cov boilers. Nws cov yam ntxwv tseem ceeb suav nrog:
Cov khoom siv kho tshuab zoo heev: lub zog tensile ≥550 MPa, lub zog tawm los ≥345 MPa, elongation ≥18%, thiab kev cuam tshuam toughness ua tau raws li ASTM A20 tus qauv.
Kev ua haujlwm vuam zoo: txhawb nqa kev siv tes arc vuam, submerged arc vuam, roj tiv thaiv vuam thiab lwm yam txheej txheem, thiab kev kho cua sov thiab cua sov yog qhov yuav tsum tau ua tom qab vuam kom tiv thaiv kev tawg.
Kev tiv taus kub thiab tiv taus corrosion: Tseem ruaj khov hauv qhov kub ua haujlwm ntawm -20 ℃ txog 450 ℃, tsim nyog rau cov chaw muaj corrosive xws li acids thiab alkalis.
Lub teeb yuag thiab muaj zog siab: Los ntawm kev tsim cov khoom siv alloying tsawg, thaum txo qhov hnyav ntawm cov qauv, lub peev xwm dais siab tau zoo dua thiab cov nqi tsim khoom siv tau txo qis.
Cov xwm txheej siv tau: cov khoom siv tseem ceeb hauv cov teb ntawm petrochemicals, fais fab nroj tsuag boilers, nuclear fais fab nroj tsuag, hydropower generation, thiab lwm yam, xws li reactors, heat exchangers, spherical tanks, nuclear reactor pressure vessels, boiler drums, thiab lwm yam.
2. Cov khoom tseem ceeb, cov kev ua tau zoo thiab cov khoom siv kho tshuab
Cov tshuaj lom neeg muaj pes tsawg leeg (kev tshuaj xyuas yaj):
C (carbon): ≤0.25% (≤0.20% thaum tuab ≤25mm)
Mn (manganese): 1.07% -1.62% (1.15% -1.50% thaum tuab ≤25mm)
P (phosphorus): ≤0.035% (qee cov qauv xav tau ≤0.025%)
S (sulfur): ≤0.035% (qee cov qauv yuav tsum tau ≤0.025%)
Si (silicon): 0.13% -0.45%
Mo (molybdenum): 0.41% -0.64% (qee cov qauv yuav tsum tau 0.45% -0.60%)
Ni (nickel): 0.40% -0.70% (qee qhov tuab)
Cov kev ua tau zoo:
Lub zog tensile: 550-690 MPa (80-100 ksi)
Lub zog tawm los: ≥345 MPa (50 ksi)
Kev ntev: ≥15% thaum lub sijhawm ntsuas yog 200 hli, ≥18% thaum lub sijhawm ntsuas yog 50 hli
Lub xeev kho cua sov: Kev xa khoom hauv normalizing, normalizing + tempering lossis tswj hwm lub xeev dov, normalizing kev kho mob yog qhov yuav tsum tau ua thaum tuab > 50 hli.
Cov txiaj ntsig ntawm kev ua haujlwm txhua yam:
Kev sib npaug ntawm lub zog siab thiab kev tawv: Ntawm 550-690 MPa tensile lub zog, nws tseem tswj tau qhov ntev ntawm ≥18%, kom ntseeg tau tias cov khoom siv muaj peev xwm tiv taus qhov tawg brittle.
Cov qauv noob zoo: Ua tau raws li qhov yuav tsum tau ua ntawm cov noob zoo ntawm tus qauv A20/A20M thiab txhim kho qhov tawv ntawm qhov kub qis.
3. Cov ntaub ntawv thov thiab cov txiaj ntsig
Kev lag luam petrochemical:
Cov ntaub ntawv thov: Ib lub tuam txhab petrochemical siv SA302GrB steel phaj los tsim cov reactors siab, uas tau khiav tas li rau 5 xyoos ntawm 400 ℃ thiab 30 MPa yam tsis muaj kab nrib pleb lossis deformation.
Qhov Zoo: Kev tiv taus zoo heev rau hydrogen corrosion, thiab 100% ultrasonic qhov tsis xws luag nrhiav tau ntawm welds ua kom muaj kev nyab xeeb ntawm cov khoom siv.
Lub zog fais fab nuclear:
Cov ntaub ntawv thov: Lub thawv siab reactor ntawm lub chaw tsim hluav taws xob nuclear siv SA302GrB steel phaj nrog lub thickness ntawm 120mm. Los ntawm kev kho normalizing + tempering, qhov kev tiv thaiv hluav taws xob tau 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 qhov yuav tsum tau ua ntawm ASME specifications.
Lub zog fais fab boiler teb:
Cov ntaub ntawv thov: Lub nruas boiler supercritical siv SA302GrB steel phaj, uas ua haujlwm ntawm 540 ℃ thiab 25 MPa, thiab nws lub neej kev pabcuam txuas ntxiv mus txog 30 xyoo.
Qhov Zoo: Lub zog luv luv ntawm qhov kub thiab txias ncav cuag 690 MPa, uas yog 15% sib dua li cov hlau carbon thiab txo kev siv hluav taws xob.
Kev tsim hluav taws xob hydropower:
Cov ntaub ntawv thov: Cov yeeb nkab dej siab ntawm lub chaw nres tsheb hydropower siv SA302GrB steel phaj thiab dhau 200,000 qhov kev sim qaug zog hauv ib puag ncig ntawm -20 ℃ txog 50 ℃.
Qhov Zoo: Qhov kub qis cuam tshuam rau qhov kub thiab txias (≥27 J ntawm -20 ℃) ​​ua tau raws li qhov xav tau huab cua hnyav ntawm thaj chaw roob.
4. Kev nyab xeeb, kev tiv thaiv ib puag ncig thiab qhov tseem ceeb ntawm kev lag luam
Kev Nyab Xeeb:
Dhau qhov kev sim cuam tshuam ASTM A20 (V-notch impact energy ≥34 J ntawm -20 ℃), kom ntseeg tau tias qhov kev pheej hmoo ntawm qhov kub qis brittle fracture tsawg dua 0.1%.
Qhov nyuaj ntawm thaj chaw cuam tshuam los ntawm cua sov ntawm qhov vuam yog ≤350 HV los tiv thaiv kev tawg los ntawm hydrogen.
Kev tiv thaiv ib puag ncig:
Cov ntsiab lus molybdenum ntawm 0.41% -0.64% txo qhov kev siv nickel thiab txo cov pa phem ntawm cov hlau hnyav.
Ua raws li EU RoHS cov lus qhia thiab txwv tsis pub siv cov tshuaj lom neeg xws li cov hlau lead thiab mercury.
Qhov tseem ceeb ntawm kev lag luam:
Nws suav txog 25% ntawm kev lag luam thoob ntiaj teb ntawm cov hlau phaj siab thiab yog cov khoom siv tseem ceeb rau kev siv hluav taws xob nuclear thiab cov khoom siv petrochemical.
Txhawb nqa cov ntawv thov kub dav dav los ntawm -20 ℃ txog 450 ℃, thiab txhim kho kev ua haujlwm ntawm cov khoom siv los ntawm 15% -20% piv rau cov hlau carbon ib txwm muaj.
Xaus lus
SA302GrB steel phaj tau dhau los ua cov khoom siv tseem ceeb ntawm cov khoom siv niaj hnub kub thiab siab vim nws lub zog siab, tiv taus corrosion thiab yooj yim vuam. Nws qhov sib npaug ntawm kev nyab xeeb, kev tiv thaiv ib puag ncig thiab kev siv nyiaj tsim nyog ua rau nws tsis tuaj yeem hloov pauv hauv cov teb ntawm lub zog nuclear, petrochemicals, lub zog, thiab lwm yam, thiab nws tab tom tsav tsheb kev txhim kho cov khoom siv kev lag luam mus rau qhov kev coj ua zoo dua thiab muaj kev nyab xeeb dua.