1. Nhanganyaya

ASTM A333 Gr.6ipombi yesimbi yekabhoni inoshandiswa zvakanyanya uye tembiricha shoma yekushanda inosvika -45°C. Nekuda kwekusimba kwayo kwakanyanya patembiricha yakaderera uye kushanda zvakanaka kwemari, inoshandiswa zvakanyanya muzvifekitori zvemafuta, michina ye cryogenic, uye masisitimu ekutumira gasi rakanyungudutswa.

Mukutenga zvinhu zveinjiniya,Mapaipi eA333 Gr.6Kazhinji dzinoiswa muzvikamu zviviri: "Sour Service" uye "Sweet Service" (yakajairika). Kunyange zvazvo mhando dzese dziri mbiri dzichisangana nezvinodiwa zvemakemikari uye zvehunhu hwemakanika zveASTM A333 standard, dzakasiyana zvakanyanya mukudzivirira kwadzo hydrogen sulfide (H₂S) corrosion—musiyano unosarudza mamiriro avo akasiyana ekushandiswa.

2. Musiyano Mukuru Pakati Pebasa Rinonaka Nerinonaka

2.1 Mamiriro Ebasa

Basa Rinotapira (Risingasvibi): Rakakodzera nzvimbo dzisina H₂S kana dzine kumanikidzwa kwakaderera kweH₂S. Chinhu chikuru chaunofanira kufunga nezvacho magadzirirwo acho kusimba kwekupisa kwakaderera uye kugona kwakajairika kutakura kumanikidzwa.

Basa Rinovava: Rakagadzirirwa nzvimbo dzine H₂S yakanyorova, uko zvinhu zvinofanira kutsungirira tembiricha yakaderera uye ngura yeH₂S panguva imwe chete. Zvinhu zvinovava zvinogamuchirwawo zvizere pakushandisa sevhisi inotapira.

2.2 Kudzora Kuumbwa Kwemakemikari

Kunyangwe ASTM A333 Gr.6 specification yebase ichiisa miganhu yeC, Mn, P, S, nezvimwe zvinhu, ma sour service pipes anoda kudzorwa kwakasimba kwemakemikari:

Paramita	Standard A333 Gr.6	Basa reSour A333 Gr.6
Sarufa (S)	≤ 0.035%	Inodzorwa zvakasimba, kazhinji ≤ 0.015%
Phosphorus (P)	≤ 0.035%	Inodzorwa zvakasimba, kazhinji ≤ 0.025%
Yakaenzana neKabhoni (CE)	Hazvisungirwi	Yakaganhurirwa zvishoma (semuenzaniso, ≤ 0.43%) kudzivirira kuomarara kwakanyanya

Nekuderedza tsvina yakaita seS neP, uye kuderedza carbon equivalent, sour service pipes inoderedza mukana wekubatwa ne sulfide stress corrosion cracking (SSC) kubva pakuona kwemakemikari.

2.3 Zvinodiwa paKuoma uye Kupisa

Kudzora kuomarara ndechimwe chezvinhu zvinonyanya kusiyanisa pakati pesimba rinonaka nerinotapira. Simba rinonaka A333 Gr.6 rinoda kuomarara kwakanyanya kwe22 HRC (Rockwell C) kana 248 HBW. Izvi zvinodaro nekuti ma microstructures ekuomarara anowanzo kanganiswa nehydrogen uye stress corrosion munzvimbo dzeH₂S.

Panyaya yekurapa kupisa, mapaipi emvura anodziya anowanzoda maitiro eNormalized kana Quenched & Tempered (Q&T) kuti awane chimiro chakafanana, chakapfava chinowedzera kuramba kweSSC. Mapaipi emvura anodziya (anotapira) ane zvinodiwa zvekurapa kupisa zvishoma nezvishoma.

2.4 Zvimwe Zvinodiwa Pakuongororwa

Mapaipi emvura anofanirwa kuongororwa kuti anoenderana nemutemo weNACE (semuenzaniso, NACE MR0175 / ISO 15156), anowanzo sanganisira:

Kuedzwa kweSSC (Sulfide Stress Cracking, NACE TM0177)

Kuongororwa kweHIC (Kupwanyika Kunokonzerwa neHydrogen, NACE TM0284)

Mapaipi ebasa akajairika (anotapira) anowanzo fanirwa kusangana nezvinodiwa zveASTM A333 zvine tembiricha yakaderera (-46°C, avhareji yesimba remagetsi ≥ 20J) pamwe chete nekuongorora zvivakwa zvemakanika nguva dzose.

3. Pfupiso uye Mazano Ekusarudza

Chikamu	Standard A333 Gr.6	Basa reSour A333 Gr.6
Nzvimbo Yebasa	Hapana H₂S kana H₂S isingakoshi	Sour media ine H₂S yakanyorova
Muganho weKuoma	Hapana muganho wakakosha	≤ 22 HRC / 248 HBW
Kurapa Kupisa	Kugadziriswa kwakajairika	Yakajairika kana kuti Q&T; microstructure yakafanana
Kuedzwa Kwekuwedzera	Kuedzwa kwemhedzisiro yekupisa kwakaderera	Kuongororwa kweSSC + HIC zvichienderana neNACE standards
Kutevedzera NACE	Hazvidikanwi	NACE MR0175 inoenderana nezvinodiwa

Mazano Ekusarudza: Munguva yekugadzira, zvakakosha kuona kana H₂S iripo munzvimbo yebasa. Kana mamiriro eH₂S akanyorova aripo, zvirevo zvekutenga zvinofanirwa kunyorwa zvakajeka kuti "A333 Gr.6 yeSour Service, inoenderana neNACE MR0175 / ISO 15156," ine zvinodiwa zvakajeka zvekuomarara, kufanana nekabhoni, kurapwa kwekupisa, uye kuyedzwa kwekuwedzera. Mapaipi eA333 Gr.6 akajairwa haafanire kushandiswa mu sour media, sezvo izvi zvinogona kukonzera njodzi yekukundikana kwekupwanya ngura.