ASTM A335 P12 (ASME SA335 P12) bututu ne mai ƙarfe mara tsari wanda aka ƙera don hidimar zafi mai yawa.
Babban abubuwan haɗin P12 sune 0.08–1.25% chromium da 0.44–0.65% molybdenum, suna rarraba shi a matsayin ƙarfe na ƙarfe na Cr-Mo.
Wannan kayan yana ba da ƙarfin zafin jiki mai kyau, juriya ga zafi, da juriya ga iskar shaka, kuma ana amfani da shi sosai a cikin boilers, superheaters, thermometers, da bututun matsi na tasoshin.
Ana kuma amfani da bututun P12 don lanƙwasawa, flanging (vanstoneing), da ayyukan ƙirƙirar makamantan su, da kuma don haɗakar walda.
Lokacin gudanar da gwajin sinadaran P12, za a yi shi bisa ga ASTM A999. Bukatun sinadaran sune kamar haka:
| Matsayi | Abun da aka haɗa, % | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P12 | 0.05 - 0.15 | 0.30 - 0.61 | matsakaicin 0.025 | matsakaicin 0.025 | matsakaicin 0.50 | 0.08 - 1.25 | 0.44 - 0.65 |
Chromium yana ƙara juriyar bututun ƙarfe ga yanayin zafi mai yawa kuma yana inganta kwanciyar hankalinsu yayin aikin zafi mai yawa na dogon lokaci. Molybdenum yana ƙara ƙarfin zafin jiki da juriya ga ƙwanƙwasa.
| Matsayi | ASTM A335 P12 | |
| Ƙarfin tauri, min, ksi [MPa] | 60 [415] | |
| Ƙarfin samarwa, min, ksi [MPa] | 32 [220] | |
| Tsawaita a cikin inci 2 ko 50 mm (ko 4D), minti, % | Tsawon lokaci | Mai wucewa |
| Mafi ƙarancin tsawaitawa na asali don kauri na bango 5/16 a cikin [8 mm] ko sama da haka, gwaje-gwajen tsiri, da kuma ga duk ƙananan girma dabam-dabam da aka gwada a cikakken sashe | 30 | 20 |
| Lokacin da aka yi amfani da daidaitaccen tsawon ma'aunin zagaye na inci 2 ko mm 50 ko ƙaramin samfurin girman da ya yi daidai da 4D (sau 4 diamita) | 22 | 14 |
| Ga gwaje-gwajen tsiri, za a yi ragi ga kowane 1/32 a cikin [0.8 mm] raguwar kauri na bango ƙasa da inci 5/16 [8 mm] daga mafi ƙarancin tsawaitawa na maki masu zuwa. | 1.50 | 1.00 |
Mai ƙera da Yanayi
Za a yi bututun ƙarfe na ASTM A335 P12 ta hanyar amfani da fasahar zamani.tsari mara matsalakuma za a yi amfani da shi ko dai a yi amfani da shi da zafi ko kuma a yi amfani da shi da sanyi, kamar yadda aka ƙayyade.
Maganin Zafi
Za a sake dumama dukkan bututun P12 don maganin zafi da kuma maganin zafi bisa ga buƙatun teburin.
| Matsayi | Nau'in Maganin Zafi | Zafin jiki mai tsauri ko mai jure zafi |
| ASTM A335 P12 | cikakken ko isothermal annea | — |
| normalize da kuma daidaita yanayin | 1200 ℉ [650 ℃] | |
| ƙaramin bincike | 1200 ~ 1300 ℉ [650 ~ 705 ℃] |
Kowace tsawon bututu mai diamita na waje fiye da inci 10 [250 mm] da kauri na bango ƙasa da inci 0.75 [19 mm] za a yi masa gwajin hydrostatic.
A madadin haka, ana iya amfani da gwajin da ba ya lalatawa daidai da ASTM E213, E309, da E570.
Ko da kuwa hanyar gwajin da aka zaɓa, za a nuna ta a kan alamar bututu, tare da buƙatun alama kamar haka:
| Ultrasonic | Ɓoyayyen ruwa | Eddy Current | Hydrostatic | Alamar |
| No | No | No | Ee | Matsi na Gwaji |
| Ee | No | No | No | UT |
| No | Ee | No | No | FL |
| No | No | Ee | No | EC |
| Ee | Ee | No | No | UT / FL |
| Ee | No | Ee | No | UT / EC |
| No | No | No | No | NH |
| Ee | No | No | Ee | Matsi na UT / Gwaji |
| No | Ee | No | Ee | FL / Matsi na Gwaji |
| No | No | Ee | Ee | Matsi na EC / Gwaji |
Juriyar Girma
Ga bututun da aka yi wa oda zuwa NPS [DN] kodiamita na waje, bambance-bambancen diamita na waje ba zai wuce waɗanda aka ƙayyade a cikin teburin busa ba.
| Mai Zaɓen NPS [DN] | Bambancin da aka Yarda | |
| a cikin. | mm | |
| 1/8 zuwa 1 1/2 [6 zuwa 40], inci. | ±1/64 [0.015] | ±0.40 |
| Sama da inci 1 1/2 zuwa 4 [40 zuwa 100], inci. | ±1/32 [0.031] | ±0.79 |
| Sama da 4 zuwa 8 [100 zuwa 200], inci. | -1/32 - +1/16 [-0.031 - +0.062] | -0.79 - +1.59 |
| Sama da 8 zuwa 12 [200 zuwa 300], inci. | -1/32 - +3/32 [-0.031 - 0.093] | -0.79 - +2.38 |
| Sama da 12 [300] | ±1% na diamita na waje da aka ƙayyade | |
Ga bututun da aka yi odadiamita na ciki, diamita na ciki ba zai bambanta fiye da ±1% daga diamita na ciki da aka ƙayyade ba.
Juriyar Kauri a Bango
Baya ga iyakancewar kauri na bango ga bututun da aka sanya ta hanyar iyakance nauyi a cikin ASTM A999, kauri na bango na bututun da ke wurin zai kasance cikin jurewar a cikin teburin busa.
| Mai Zaɓen NPS [DN] | An ƙayyade haƙuri, % siffar |
| 1/8 zuwa 2 1/2 [6 zuwa 65] ya haɗa da duk rabon t/D | -12.5 - +20.0 |
| Sama da 2 1/2 [65], t/D ≤ 5% | -12.5 - +22.5 |
| Sama da 2 1/2, t/D ＞ 5% | -12.5 - +15.0 |
t = Kauri a Bango da aka ƙayyade; D = Diamita a Waje da aka ƙayyade.
| ASME | ASTM | EN | GB | JIS |
| ASME SA335 P12 | ASTM A213 T12 | EN 10216-2 13CrMo4-5 | GB/T 5310 15CrMoG | JIS G 3462 STBA22 |
Kayan aiki:bututun ƙarfe marasa tsari da kayan aiki na ASTM A335 P12;
Girman:1/8" zuwa 24", ko kuma an keɓance shi bisa ga buƙatunku;
Tsawon:Tsawon bazata ko yankewa bisa ga oda;
Marufi:Baƙin shafi, ƙarshen da aka yanke, kariyar ƙarshen bututu, akwatunan katako, da sauransu.
Tallafi:Takaddun shaida na IBR, duba TPI, MTC, yankewa, sarrafawa, da kuma keɓancewa;
Moq:mita 1;
Sharuɗɗan Biyan Kuɗi:T/T ko L/C;
Farashi:Tuntube mu don samun sabbin farashin bututun ƙarfe na P12.
