** 1. Qhov sib txawv ntawm P11 thiab P22: **
P11 thiab P22 yog qib ntawm chromium-molybdenum (cr-mo) cov kav hlau alloy steel nyob rau hauv astm A335. Lub ntsiab lus sib txawv nyob hauv lawv cov tshuaj muaj pes tsawg leeg tshuaj thiab cov ntawv thov:
- ** P11 **: muaj ~ 1.25% chromium thiab ~ 0. 5% molybdenum. Siv rau kev pab cuam siab kub (txog ~ 550 degree).
- ** P22 **: muaj ~ 2.25% chromium thiab ~ 1% molybdenum. Muaj cov zog siab dua siab (txog li ~ 580 degree) thiab oxidation kuj ntau dua P11.
** 2. Lub zog tensile ntawm P11: **
Lub zog tensile ntawm Astm A335 P11 khoom siv feem ntau yog li ntawm ** 415 MPa (60 ksi) thiab 585 ksi) **. Muaj nuj nqis muaj tseeb yog muaj kev kho cua sov thiab tsim qauv.
** 3. ASTM A335 P11 Khoom Siv: **
ASTM A335 P11 yog qhov sib xyaw ua ke ferritic alloy-steel yeeb nkab tsim rau kev pab kub kub. Nws yog tsim cov hlau, nrog ** 1.25% cr, 0. 5% me me rau cov pa roj carbon, thiab siliconese, thiab silicon. Nws yog siv rau hauv cov nroj tsuag hluav taws xob, ua kom zoo dua, thiab cov raj xa khoom rau chav, roj, lossis roj.
** 4. Electrode rau vuam P11: **
Rau vuam ttm ATM ATM ATM A335 P11, ** e 8018- b2 ** (A A ANS Kev faib tawm) lossis cov hluav taws xob sib npaug muaj feem ntau siv. Preheating (150-200 degree) thiab tom qab weld-weld kev kho cua sov (duab) ntawm ~ 650-750 degree yog qhov tseem ceeb kom tsis txhob tawg thiab tsim nyog microstructure.
** 5. Hardness ntawm P11 Khoom Siv: **
Cov tawv tawv ntawm Astm A335 P11 li ntawm ** 140-170 HB (Brinell Hardness) **. Hardness tseem ceeb yuav sib txawv me ntsis raws li kev kho cua sov thiab kev tsim cov txheej txheem.
