1. Kupu Whakataki

ASTM A333 Gr.6He rauemi paipa maitai waro pāmahana-iti te whakamahinga whānuitia, ko te pāmahana ratonga iti rawa ko te -45°C. Nā te tino pakari o te pāmahana-iti me te whai hua o te utu, he whānuitia te whakamahinga i roto i ngā tipu matū hinu, ngā taputapu cryogenic, me ngā pūnaha tuku hau wai.

I roto i te hokohoko hangarau,Ngā paipa A333 Gr.6e whakarōpūtia ana kia rua ngā āhuatanga tuku: "Ratonga Kawa" me "Ratonga Reka" (paerewa/noa). Ahakoa e tutuki ana ngā momo e rua i ngā whakaritenga hanganga matū taketake me ngā āhuatanga miihini o te paerewa ASTM A333, he rerekē te ātete ki te waikura hauwai whanariki (H₂S)—he rerekētanga e whakatau ana i ngā āhuatanga tono rerekē.

2. Ngā Rerekētanga Matua i waenga i te Ratonga Kawa me te Ratonga Reka

2.1 Ngā Tikanga Ratonga

Ratonga Reka (Kore-kawa): He pai mō ngā taiao kāore he H₂S, he iti rawa rānei te pēhanga wāhanga H₂S. Ko ngā whakaaro matua mō te hoahoa ko te pakari o te pāmahana iti me te kaha ki te pupuri i te pēhanga tikanga.

Ratonga Kawa: I hangaia mō ngā taiao kei roto te H₂S māku, me tu atu te rauemi i ngā pāmahana iti me te waikura H₂S i te wā kotahi. E tino manakohia ana hoki ngā rauemi ratonga kawa mō ngā tono ratonga reka.

2.2 Te Whakahaere i te Hanganga Matū

Ahakoa e whakatakoto ana te whakatakotoranga ASTM A333 Gr.6 i ngā rohe mō te C, Mn, P, S, me ētahi atu huānga, me kaha ake te whakahaere matū mō ngā paipa ratonga kawa:

Tawhā	Paerewa A333 Gr.6	Ratonga Waikawa A333 Gr.6
Whānariki (S)	≤ 0.035%	He tino whakahaere, he ≤ 0.015% te nuinga
Whēkau (P)	≤ 0.035%	He tino whakahaere, he ≤ 0.025% te nuinga
Waro ōrite (CE)	Kāore i te whakahauhia	He iti te whakawhāiti (hei tauira, ≤ 0.43%) hei ārai i te pakeketanga nui rawa

Mā te whakaiti i ngā poke pēnei i te S me te P, me te whakawhāiti i te ōrite o te waro, ka whakaitihia e ngā paipa ratonga kawa te āheinga ki te pakaru waikura ahotea whanariki (SSC) mai i te tirohanga hanganga matū.

2.3 Ngā Whakaritenga mō te Pakari me te Maimoatanga Wera

Ko te whakahaere i te pakeketanga tētahi o ngā mea tino nui e wehewehe ana i te kai kawa me te kai reka. Ko te pakeketanga mōrahi o te kai kawa A333 Gr.6 e hiahiatia ana he 22 HRC (Rockwell C) me te 248 HBW rānei. Nā te mea he tino ngāwari ngā hanganga moroiti pakeketanga ki te pakarukaru i puta mai i te hauwai me te pakaru waikura ahotea i roto i ngā taiao H₂S.

Mō te maimoatanga wera, ko ngā paipa ratonga kawa e hiahia ana ki ngā tukanga Normalized, Quenched & Tempered rānei (Q&T) kia tutuki ai he hanganga moroiti ōrite, pai hoki e whakarei ake ana i te ātete SSC. He ngāwari ake ngā whakaritenga maimoatanga wera mō ngā paipa ratonga paerewa (reka).

2.4 Ngā Whakaritenga Whakamātautau Tāpiri

Me whakamana ngā paipa ratonga kawa i te manatoko hanganga ture paerewa NACE (hei tauira, NACE MR0175 / ISO 15156), ko te tikanga kei roto ko:

Whakamātautau SSC (Pakarutanga Taumahatanga o te Sulfide, NACE TM0177)

Whakamātautau HIC (Pakaru i Āraia e te Hauwai, NACE TM0284)

Ko ngā paipa ratonga paerewa (reka) me tutuki noa i ngā whakaritenga whakamātautau pānga pāmahana-iti o te ASTM A333 (-46°C, te kaha pānga toharite iti rawa ≥ 20J) me te manatoko āhuatanga miihini noa.

3. Whakarāpopototanga me ngā Taunakitanga Kōwhiringa

Āhuatanga	Paerewa A333 Gr.6	Ratonga Waikawa A333 Gr.6
Waenga Ratonga	Kāore he H₂S, he iti noa iho rānei te H₂S	Ngā mea kawa kei roto i te H₂S mākū
Tepe Pakari	Kāore he herenga motuhake	≤ 22 HRC / 248 HBW
Te Maimoatanga Wera	Tukatuka tikanga	Hanganga moroiti ōrite kua whakaōritehia, kua whakatauritehia rānei
Whakamātautau Tāpiri	Whakamātautau pānga pāmahana-iti	Whakamātautau SSC + HIC e ai ki ngā paerewa NACE
Te Whakatutukitanga NACE	Kāore e hiahiatia	E tutuki ana i te NACE MR0175

Ngā Taunakitanga Kōwhiringa: I te wā hoahoa, he mea nui kia whakatauhia mēnā kei roto te H₂S i te taiao ratonga. Mena kei te wātea ngā āhuatanga H₂S māku, me mārama te kī a te whakatakotoranga hoko "A333 Gr.6 mō te Ratonga Waikawa, e tutuki ana i te NACE MR0175 / ISO 15156," me ngā whakaritenga mārama mō te pakeke, te ōrite waro, te maimoatanga wera, me ngā whakamātautau tāpiri. Kaua rawa ngā paipa paerewa A333 Gr.6 e whakamahia ki ngā rauemi waikawa, nā te mea ka arahi pea tēnei ki ngā pakaru waikura ahotea kino.