ASTM A335 P12 (ASME SA335 P12) yog cov yeeb nkab hlau tsis sib xyaw uas tsim los rau kev pabcuam kub siab.
P12 cov ntsiab lus tseem ceeb yog 0.08–1.25% chromium thiab 0.44–0.65% molybdenum, faib nws ua Cr-Mo alloy hlau.
Cov khoom siv no muaj lub zog zoo heev thaum kub thiab txias, tiv taus cua sov, thiab tiv taus oxidation, thiab feem ntau siv rau hauv boilers, superheaters, heat exchangers, thiab pressure vessel piping.
Cov kav dej P12 kuj tseem siv rau kev khoov, flanging (vanstoning), thiab cov haujlwm zoo sib xws, nrog rau kev vuam fusion.
Thaum ua qhov kev sim tshuaj lom neeg rau P12, nws yuav tsum tau ua raws li ASTM A999. Cov kev cai ntawm cov tshuaj lom neeg yog raws li nram no:
| Qib | Cov khoom xyaw,% | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P12 | 0.05 - 0.15 | 0.30 - 0.61 | 0.025 siab tshaj | 0.025 siab tshaj | 0.50 siab tshaj | 0.08 - 1.25 | 0.44 - 0.65 |
Chromium ua rau cov kav hlau tiv taus kub siab thiab txhim kho lawv qhov ruaj khov thaum lub sijhawm ua haujlwm kub siab ntev. Molybdenum ua rau lub zog kub siab thiab tiv taus nkag.
| Qib | ASTM A335 P12 | |
| Lub zog tensile, min, ksi [MPa] | 60 [415] | |
| Lub zog tawm los, min, ksi [MPa] | 32 [220] | |
| Kev ntev hauv 2 nti lossis 50 hli (lossis 4D), feeb,% | Ntev ntev | Txoj kab hla |
| Qhov ntev tsawg kawg nkaus rau phab ntsa 5/16 nti [8 hli] thiab ntau dua hauv qhov tuab, kev sim kab txaij, thiab rau txhua qhov me me uas tau sim hauv seem tag nrho | 30 | 20 |
| Thaum siv tus qauv puag ncig 2 hauv lossis 50 hli gage ntev lossis cov qauv me dua nrog qhov ntev gage sib npaug rau 4D (4 npaug ntawm txoj kab uas hla) | 22 | 14 |
| Rau kev sim kab txaij, kev txiav tawm rau txhua 1/32 hauv [0.8 hli] txo qis hauv phab ntsa tuab hauv qab 5/16 hauv [8 hli] los ntawm qhov ntev tsawg kawg nkaus ntawm cov feem pua hauv qab no yuav tsum tau ua | 1.50 | 1.00 |
Chaw Tsim Khoom thiab Mob
ASTM A335 P12 cov kav hlau yuav tsum tau ua los ntawmcov txheej txheem tsis muaj teeb meemthiab yuav tsum yog kub tiav los yog txias kos, raws li tau teev tseg.
Kev Kho Mob Kub
Tag nrho cov yeeb nkab P12 yuav tsum tau rov ua kom sov rau kev kho cua sov thiab kho cua sov raws li qhov yuav tsum tau ua ntawm lub rooj.
| Qib | Hom Kho Mob Kub | Kub thiab txias uas tsis kub dhau los yog kub dhau |
| ASTM A335 P12 | tag nrho los yog isothermal anneal | — |
| normalizes thiab txo qhov mob | 1200 ℉ [650 ℃] | |
| subcritical anneal | 1200 ~ 1300 ℉ [650 ~ 705 ℃] |
Txhua qhov ntev ntawm cov yeeb nkab uas muaj sab nraud loj dua 10 nti [250 mm] thiab phab ntsa tuab tsawg dua lossis sib npaug li 0.75 nti [19 mm] yuav tsum raug kuaj hydrostatic.
Los yog, kev sim tsis ua puas tsuaj raws li ASTM E213, E309, thiab E570 yuav siv tau.
Txawm hais tias xaiv txoj kev sim li cas los xij, nws yuav tsum tau qhia rau ntawm cov yeeb nkab cim, nrog rau cov kev cai cim raws li nram no:
| Ultrasonic | Kev Tawm Dej Flux | Eddy Current | Hydrostatic | Kev cim |
| No | No | No | Yog | Kev Ntsuas Siab |
| Yog | No | No | No | UT |
| No | Yog | No | No | FL |
| No | No | Yog | No | EC |
| Yog | Yog | No | No | UT / FL |
| Yog | No | Yog | No | UT / EC |
| No | No | No | No | NH |
| Yog | No | No | Yog | UT / Kev Ntsuas Siab |
| No | Yog | No | Yog | FL / Kev Ntsuas Siab |
| No | No | Yog | Yog | EC / Kev Ntsuas Siab |
Kev kam rau siab ntawm qhov ntev
Rau cov kav dej xaj rau NPS [DN] lossissab nraud txoj kab uas hla, kev hloov pauv ntawm sab nraud txoj kab uas hla yuav tsum tsis pub tshaj qhov tau teev tseg hauv lub rooj tshuab.
| Tus Neeg Xaiv NPS [DN] | Kev Hloov Pauv Uas Tso Cai | |
| nyob rau hauv. | mm | |
| 1/8 txog 1 1/2 [6 txog 40], nti. | ±1/64 [0.015] | ±0.40 |
| Tshaj 1 1/2 txog 4 [40 txog 100], nti. | ±1/32 [0.031] | ±0.79 |
| Tshaj 4 txog 8 [100 txog 200], nti. | -1/32 - +1/16 [-0.031 - +0.062] | -0.79 - +1.59 |
| Tshaj 8 txog 12 [200 txog 300], nti. | -1/32 - +3/32 [-0.031 - 0.093] | -0.79 - +2.38 |
| Tshaj 12 [300] | ±1% ntawm qhov ntsuas sab nraud uas tau teev tseg | |
Rau cov kav dej uas tau xaj kom uasab hauv txoj kab uas hla, sab hauv txoj kab uas hla yuav tsum tsis txhob txawv ntau dua ± 1% ntawm sab hauv txoj kab uas hla uas tau teev tseg.
Kev kam rau siab ntawm phab ntsa
Ntxiv rau qhov kev txwv tsis pub dhau ntawm phab ntsa tuab rau cov yeeb nkab uas raug txwv los ntawm kev txwv qhov hnyav hauv ASTM A999, phab ntsa tuab rau cov yeeb nkab ntawm qhov taw tes yuav tsum nyob hauv qhov kev kam rau siab hauv lub rooj tshuab.
| Tus Neeg Xaiv NPS [DN] | Kev kam rau siab,% daim ntawv teev tseg |
| 1/8 txog 2 1/2 [6 txog 65] suav nrog txhua qhov piv ntawm t/D | -12.5 - +20.0 |
| Saum toj no 2 1/2 [65], t/D ≤ 5% | -12.5 - +22.5 |
| Saum toj no 2 1/2, t/D > 5% | -12.5 - +15.0 |
t = Qhov Thickness ntawm Phab Ntsa uas tau teev tseg; D = Qhov Txoj Kab Uas Tau Teev Tseg Sab Nraud.
| ASME | ASTM | EN | GB | JIS |
| ASME SA335 P12 | ASTM A213 T12 | EN 10216-2 13CrMo4-5 | GB/T 5310 15CrMoG | JIS G 3462 STBA22 |
Khoom siv:ASTM A335 P12 cov kav hlau tsis muaj seamless thiab cov khoom siv;
Loj:1/8 "txog 24", lossis kho raws li koj xav tau;
Ntev:Qhov ntev random lossis txiav kom txiav txim;
Ntim:Cov txheej txheem dub, cov qhov kawg beveled, cov yeeb nkab kawg tiv thaiv, cov ntoo crates, thiab lwm yam.
Kev Txhawb Nqa:Daim ntawv pov thawj IBR, kev tshuaj xyuas TPI, MTC, kev txiav, kev ua tiav, thiab kev kho kom haum;
MOQ:1 m;
Cov nqe lus them nqi:T/T los yog L/C;
Nqe:Tiv tauj peb rau cov nqi yeeb nkab P12 tshiab kawg.
