ASTM A335 P12 (ASME SA335 P12) ke phaephe ya tshepe e se nang motswako e etseditsweng tshebeletso ya mocheso o phahameng.
Dikarolo tse ka sehloohong tsa ho kopanya P12 ke 0.08–1.25% ya chromium le 0.44–0.65% ya molybdenum, e e arolang e le tshepe ya alloy ya Cr-Mo.
Thepa ena e fana ka matla a matle a mocheso o phahameng, ho hanyetsa mocheso le ho hanyetsa oxidation, 'me e sebelisoa hangata ho li-boiler, li-superheater, li-heat exchanger le liphaephe tsa khatello ea methapo ea mali.
Liphaephe tsa P12 le tsona li sebelisoa hangata bakeng sa ho kobeha, ho flanging (vanstoneing), le ts'ebetso e ts'oanang ea ho theha, hammoho le bakeng sa ho tjheseletsa motsoako.
Ha ho etsoa liteko tsa metsoako ea lik'hemik'hale bakeng sa P12, e lokela ho etsoa ho latela ASTM A999. Litlhoko tsa metsoako ea lik'hemik'hale ke tse latelang:
| Sehlopha | Sebopeho, % | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P12 | 0.05 - 0.15 | 0.30 - 0.61 | 0.025 max | 0.025 max | 0.50 max | 0.08 - 1.25 | 0.44 - 0.65 |
Chromium e ntlafatsa haholo khanyetso ea liphaephe tsa tšepe mochesong o phahameng 'me e ntlafatsa botsitso ba tsona nakong ea ts'ebeletso ea mocheso o phahameng oa nako e telele. Molybdenum e eketsa matla a mocheso o phahameng le khanyetso ea ho thekesela.
| Sehlopha | ASTM A335 P12 | |
| Matla a ho tensile, min, ksi [MPa] | 60 [415] | |
| Matla a tlhahiso, bonyane, ksi [MPa] | 32 [220] | |
| Ho lelefatsa ka 2 in. kapa 50 mm (kapa 4D), min, % | Longitudinal | Ho fapanyetsana |
| Bolelele bo fokolang ba motheo bakeng sa lebota la 5/16 ka hare ho [8 mm] le ho feta ka botenya, liteko tsa strip, le bakeng sa boholo bohle bo bonyenyane bo lekiloeng karolong e felletseng. | 30 | 20 |
| Ha ho sebediswa mohlala o tloaelehileng wa bolelele ba gage ba 2 in kapa 50 mm kapa o monyane ka ho lekana, bolelele ba gage bo lekanang le 4D (bophara ba makgetlo a 4) | 22 | 14 |
| Bakeng sa liteko tsa strip, ho tla etsoa phokotso bakeng sa phokotso e 'ngoe le e 'ngoe ea 1/32 in [0.8 mm] ea botenya ba lebota ka tlase ho 5/16 in. [8 mm] ho tsoa ho bolelele ba mantlha ba bonyane ba lintlha tse latelang tsa peresente. | 1.50 | 1.00 |
Moetsi le Boemo
Liphaephe tsa tšepe tsa ASTM A335 P12 li lokela ho etsoa kets'ebetso e se nang sekoli'me e lokela ho tjheswa kapa ho hulwa ka serame, jwalo ka ha ho boletswe.
Kalafo ea Mocheso
Phaephe eohle ea P12 e lokela ho futhumatsoa hape bakeng sa kalafo ea mocheso le phekolo ea mocheso ho latela litlhoko tsa tafole.
| Sehlopha | Mofuta oa Phekolo ea Mocheso | Mocheso o sa hlakang kapa o Tempering |
| ASTM A335 P12 | anneal e felletseng kapa e sa fetoheng mochesong | — |
| tloaeleha le ho halefa | 1200 ℉ [650 ℃] | |
| anneal e nyenyane | 1200 ~ 1300 ℉ [650 ~ 705 ℃] |
Bolelele bo bong le bo bong ba phaephe e nang le bophara ba kantle bo fetang lisenthimithara tse 250 [250 mm] le botenya ba lebota bo ka tlase ho kapa bo lekanang le lisenthimithara tse 0.75 [19 mm] bo tla etsoa teko ea hydrostatic.
Ka tsela e 'ngoe, liteko tse sa senyeheng ho latela ASTM E213, E309, le E570 li ka sebelisoa.
Ho sa tsotelehe mokhoa oa teko o khethiloeng, o tla bontšoa ho letšoao la phaephe, ka litlhoko tsa ho tšoaea ka tsela e latelang:
| Ultrasonic | Ho Dutla ha Flux | Eddy Current | Hydrostatic | Ho tšoaea |
| No | No | No | E | Khatello ea Teko |
| E | No | No | No | UT |
| No | E | No | No | FL |
| No | No | E | No | EC |
| E | E | No | No | UT / FL |
| E | No | E | No | UT / EC |
| No | No | No | No | NH |
| E | No | No | E | UT / Teko ea Khatello |
| No | E | No | E | FL / Teko ea Khatello |
| No | No | E | E | Khatello ea EC / Teko |
Mamello ea Tekanyo
Bakeng sa liphaephe tse odarileng ho NPS [DN] kapabophara ba kantle, diphetoho tsa bophara ba kantle ha di a lokela ho feta tse boletsweng tafoleng ya ho phatloha.
| Moqapi oa NPS [DN] | Mefuta e Lumelloang | |
| ka hare. | mm | |
| 1/8 ho isa ho 1 1/2 [6 ho isa ho 40], lisenthimithara. | ±1/64 [0.015] | ± 0.40 |
| Ho feta 1 1/2 ho isa ho 4 [40 ho isa ho 100], lisenthimithara. | ±1/32 [0.031] | ± 0.79 |
| Ho feta 4 ho isa ho 8 [100 ho isa ho 200], lisenthimithara. | -1/32 - +1/16 [-0.031 - +0.062] | -0.79 - +1.59 |
| Ho feta 8 ho isa ho 12 [200 ho isa ho 300], lisenthimithara. | -1/32 - +3/32 [-0.031 - 0.093] | -0.79 - +2.38 |
| Ba fetang 12 [300] | ± 1% ea bophara bo boletsoeng ka ntle | |
Bakeng sa liphaephe tse laetsoeng hobophara ba kahare, bophara ba kahare ha boa lokela ho fapana ho feta ± 1% ho tloha bophara bo boletsoeng ba kahare.
Mamello ea Botenya ba Lebota
Ntle le moedi o sa bonahaleng wa botenya ba lebota bakeng sa phaephe o behilweng ke moedi wa boima ho ASTM A999, botenya ba lebota bakeng sa phaephe ntlheng bo tla ba ka hara mamello e tafoleng ya ho phatloha.
| Moqapi oa NPS [DN] | Mamello, % foromo E totobalitsoe |
| 1/8 ho isa ho 2 1/2 [6 ho isa ho 65] ho kenyeletsoa le dikarolelano tsohle tsa t/D | -12.5 - +20.0 |
| Kaholimo ho 2 1/2 [65], t/D ≤ 5% | -12.5 - +22.5 |
| Kaholimo ho 2 1/2, t/D ＞ 5% | -12.5 - +15.0 |
t = Botenya ba Lebota bo Boletsweng; D = Bophara ba Kantle bo Boletsweng.
| ASME | ASTM | EN | GB | JIS |
| ASME SA335 P12 | ASTM A213 T12 | EN 10216-2 13CrMo4-5 | GB/T 5310 15CrMoG | JIS G 3462 STBA22 |
Boitsebiso:liphaephe le lisebelisoa tsa tšepe tse se nang mohele tsa ASTM A335 P12;
Boholo:1/8" ho isa ho 24", kapa e etselitsoe ho latela litlhoko tsa hau;
Bolelele:Bolelele bo sa reroang kapa sehiloeng ho latela odara;
Sephutheloana:Sekoahelo se setšo, lipheletso tse betliloeng, litšireletso tsa pheletso ea liphaephe, mabokose a lehong, jj.
Tšehetso:Setifikeiti sa IBR, tlhahlobo ea TPI, MTC, ho seha, ho sebetsana le eona le ho e etsa ka tsela e ikhethileng;
MOQ:1 m;
Melao ea Tefo:T/T kapa L/C;
Theko:Ikopanye le rona bakeng sa litheko tsa morao-rao tsa peipi ea tšepe ea P12.
