Ngā rerekētanga i waenga i ngā paerewa me te tūnga
GB/T 9948: E tika ana mō ngā paipa maitai kore hononga i roto i ngā āhuatanga pāmahana reo me te pāmahana teitei (≤500℃) pēnei i tepakaru hinumetaputapu matū, ā, nō te paerewa paipa motuhake.
GB/T 5310: I hangaia mōngā kohua pēhanga teitei(ngā tawhā mamaoa ≥9.8MPa), e whakanui ana i te haumaru mō te wā roa i raro i te pāmahana teitei me te pēhanga teitei, ā, koinei te paerewa matua mō ngā ngongo poihā.
Ngā rerekētanga matua o ngā rauemi me te mahi
Te hanganga matū
Ki te whakataurite ki te 20 maitai,20GHe tino kaha ake te whakahaere a te maitai i ngā poke (pēnei i te P≤0.025%, S≤0.015%), ā, me ≤0.70% te tapeke o ngā huānga toenga (Cu, Cr, Ni, me ētahi atu) kia pumau i te pāmahana tiketike.
Ngā āhuatanga miihini
Ko te kaha kume pāmahana-rūma o te 20G (410-550MPa) te āhua nei e taupatupatu ana ki te kaha kume o te maitai 20 (≥410MPa), engari me whakarite anō hoki e te 20G te kaha manawanui pāmahana-tiketike i te 450℃ (≥110MPa), koinei te whakaritenga matua mō ngā ngongo poiha.
Hanganga iti
Me tirotirohia te 20G mō te taumata porowhita o te pearlite (≤ taumata 4) hei ārai i te pirau o te hanganga moroiti i muri i te whakamahinga roa i te pāmahana teitei, engari kāore he whakaritenga pērā mō te maitai 20G.
Ngā rerekētanga o te tukanga hanga
Te maimoatanga wera
Me whai maimoatanga whakataurite (Ac3+30℃) te 20G kia rite te rahi o te kōhao ki te taumata 5-8. Ka taea te whakamahana, te whakataurite rānei i te maitai 20, ā, he tino ngāwari te whakahaere tukanga.
Whakamātautau kore-whakangaro
Me kimi takitahi ngā hapa ultrasonic me te whakamātautau iahiko hurihuri mō ia wahi mō te maitai 20G, ko te maitai 20G ia me tirotiro tauira anake.
Te whakataurite i ngā horopaki tono
20G: Ngā poiha teihana hiko (ngā pakitara whakamatao wai, ngā whakamahana nui), ngā tauhohenga matū pēhanga teitei (ngā horopaki me ngā pāmahana hoahoa > 350℃)
20 maitaiNgā paipa ngongo mō te whakamahana i ngā oumu i roto i ngā whare hanga hinu, ngā paipa mō ngā waeine whakamātao hau me te korehau (ko te pāmahana te tikanga < 350℃)
Ngā Whakaritenga Tiwhikete
Me whiwhi ngā paipa maitai 20G i te Raihana Hanga Taputapu Motuhake (tiwhikete TS), ā, me whakarato e ia puranga he pūrongo whakamātautau mahi pāmahana teitei. Ko te maitai 20G anake e hiahiatia ana he tiwhikete taurangi kounga auau.
Ngā whakaaro kōwhiringa:
Ina tae ki ngā kaupapa tiwhikete ASME, PED rānei, ka taea e te 20G te hono atu kiSA-106B/ASTM A192, ko te maitai 20 kāore he hononga tika ki ngā rauemi paerewa o Amerika.
Mō ngā āhuatanga mahi i runga ake i te 540℃, me whai whakaaro ki ngā maitai koranu pēnei i te 12Cr1MoVG. Ko te rohenga o runga o te pāmahana e tika ana mō te 20G ko te 480℃ (te pūwāhi matua o te whakakāwhata o te maitai waro).
Wā tuku: Mei-23-2025
