Qhov kev qhia tshwj xeeb no cuam tshuam rau daim hlau ua los ntawm molybdenum alloy hlau, tshwj xeeb yog tsim los siv rau hauv welded boilers thiab lwm cov hlab ntsha siab. Cov phaj nyob rau hauv cov lus qhia no tau muab faib ua peb qib, txhua qhov muaj qhov sib txawv ntawm lub zog: Qib A, Qib B, thiab Qib C. Cov hlau siv yuav tsum tau deoxidized tag nrho (tua) kom ntseeg tau tias muaj kev sib luag thiab kev ntseeg tau. Nws kuj yuav tsum tau ua raws li cov kev cai ntawm cov tshuaj muaj pes tsawg leeg. Kev ntsuas nruj uas ua rau ntawm cov phiaj no yuav tsum ua raws li cov qauv thiab cov txheej txheem.
ASTM A204 tus qauv qhia txog lub siab lub nkoj daim hlau ua los ntawm cov hlau alloy nrog molybdenum. ASTM A204 Qib A yog siv los ntawm cov neeg tsim khoom siv rau kev lag luam, tshwj xeeb hauv cov roj, roj, thiab cov khoom siv tshuaj. Nws muaj cov thev naus laus zis ntxiv xws li HC (Hydrogen Controlled) kev sim, NACE MR0175 ua raws, thiab ntau theem ntawm cov tawv nqaij (Z15, Z25, Z35) thiab tej yam kev mob (S1, S2, S3, thiab lwm yam) rau kev txhim kho kom haum rau hauv ib puag ncig corrosive thiab kev siv tseem ceeb. .
Cov phaj nyob rau hauv cov lus qhia no muaj nyob rau hauv peb qib uas muaj cov qib sib txawv raws li hauv qab no:
|
Qib |
Tensile zog, ksi [MPa] |
|
A |
65–85 [450–585] |
|
B |
70–90 [485–620] |
|
C |
75–95 [515–655] |
ASTM A204 GR A / B / C steel phaj Chemical Composition% :
| Qib | C max | Mn max | S max |
P max |
Si |
| 204g ua | 0.18 | 0.90 | 0.035 | 0.035 | 0.15-0.40 |
| 204g ib | 0.20 | 0.90 | 0.035 | 0.035 | 0.15-0.40 |
| r204g ua | 0.23 | 0.90 | 0.035 | 0.035 | 0.15-0.40 |
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