1. Intshayelelo

I-ASTM A333 Gr.6sisixhobo sombhobho wentsimbi yekhabhoni esisetyenziswa kakhulu kwiqondo lobushushu obuphantsi, esinobushushu obuphantsi benkonzo obuyi -45°C. Ngenxa yokuqina kwayo okugqwesileyo kwiqondo lobushushu eliphantsi kunye nokusebenza kakuhle kweendleko, sisetyenziswa kakhulu kwizityalo zepetrochemical, kwizixhobo ze-cryogenic, nakwiinkqubo zokuhambisa igesi enyibilikisiweyo.

Kwizinto zokuthenga ubunjineli,Imibhobho ye-A333 Gr.6zihlala zahlulwe zibe ziimeko ezimbini zokubonelela: "Inkonzo Emuncu" kunye "Nenkonzo Emnandi" (esemgangathweni/eqhelekileyo). Nangona zombini ezi ntlobo zihlangabezana neemfuno ezisisiseko zekhemikhali kunye neepropati zoomatshini zomgangatho we-ASTM A333, zahlukile ngokusisiseko ekuchaseni kwazo ukubola kwe-hydrogen sulfide (H₂S)—umahluko ochaza iimeko zazo zokusetyenziswa ezahlukeneyo.

2. Umahluko ophambili phakathi kwenkonzo emuncu nemnandi

2.1 Iimeko zeNkonzo

Inkonzo Emnandi (Ayimuncu): Ifanelekile kwiindawo ezingenayo i-H₂S okanye ezinoxinzelelo oluncinci lwe-H₂S oluphantsi kakhulu. Izinto eziphambili ekufuneka ziqwalaselwe kuyilo lokuqina kobushushu obuphantsi kunye nomthamo wesiqhelo wokuthwala uxinzelelo.

Inkonzo Emuncu: Yenzelwe ngokukodwa iindawo ezine-H₂S emanzi, apho izinto kufuneka zimelane namaqondo obushushu aphantsi kunye nokugqwala kwe-H₂S ngaxeshanye. Izixhobo zenkonzo emuncu nazo zamkelekile ngokupheleleyo kwiinkonzo zenkonzo emuncu.

2.2 Ulawulo loKwakhiwa kweeKhemikhali

Nangona iinkcukacha zesiseko ze-ASTM A333 Gr.6 zibeka imida ye-C, Mn, P, S, kunye nezinye izinto, iipayipi zenkonzo ezimuncu zifuna ulawulo oluqinileyo lweekhemikhali:

Ipharamitha	I-A333 Gr.6 esemgangathweni	Inkonzo emuncu A333 Gr.6
I-Sulfur (S)	≤ 0.035%	Ilawulwa ngokungqongqo, ngesiqhelo ≤ 0.015%
I-Phosphorus (P)	≤ 0.035%	Ilawulwa ngokungqongqo, ngesiqhelo ≤ 0.025%
I-Carbon Equivalent (CE)	Akunyanzelekanga	Inqunyelwe kakhulu (umz., ≤ 0.43%) ukuthintela ubulukhuni obugqithisileyo

Ngokunciphisa ngakumbi ukungcola okufana ne-S kunye ne-P, kunye nokunciphisa i-carbon equivalent, imibhobho yenkonzo ye-sour inciphisa ukuthambekela kwi-sulfide stress corrosion cracking (SSC) ngokwembono yokwakheka kweekhemikhali.

2.3 Iimfuneko zoBulukhuni kunye noNyango loBushushu

Ulawulo lokuqina lolunye lwezona zinto zibalulekileyo ezahlula phakathi kwenkonzo emuncu nemnandi. Inkonzo emuncu i-A333 Gr.6 ifuna ubunzima obukhulu obuyi-22 HRC (Rockwell C) okanye i-248 HBW. Oku kungenxa yokuba izakhiwo ezincinci zokuqina okuphezulu zisengozini enkulu yokuqhekeka kwe-hydrogen kunye nokuqhekeka koxinzelelo kwiindawo ze-H₂S.

Ngokuphathelele unyango lobushushu, imibhobho yenkonzo emuncu idla ngokufuna iinkqubo zeNormalized okanye Quenched & Tempered (Q&T) ukuze kufezekiswe isakhiwo esincinci esilinganayo nesinobunono esiphucula ukumelana ne-SSC. Imibhobho yenkonzo eqhelekileyo (emnandi) ineemfuno zonyango lobushushu ezikhululekileyo.

2.4 Iimfuno ezongezelelweyo zovavanyo

Iipayipi zenkonzo yeSour kufuneka ziqinisekiswe ukuba ziyathotyelwa ngokwemigangatho ye-NACE (umz., i-NACE MR0175 / ISO 15156), ngokuqhelekileyo ziquka:

Uvavanyo lwe-SSC (i-Sulfide Stress Cracking, i-NACE TM0177)

Uvavanyo lwe-HIC (Ukuqhekeka Okubangelwa yiHydrogen, i-NACE TM0284)

Iipayipi zenkonzo ezisemgangathweni (ezithambileyo) ngokubanzi zifuna kuphela ukuhlangabezana neemfuno zovavanyo lwempembelelo oluphantsi lobushushu be-ASTM A333 (-46°C, ubuncinci bamandla empembelelo aphakathi ≥ 20J) kunye nokuqinisekiswa kwepropathi yoomatshini rhoqo.

3. Isishwankathelo kunye neengcebiso zokukhetha

Umbono	I-A333 Gr.6 esemgangathweni	Inkonzo emuncu A333 Gr.6
Inkonzo Yendlela	Akukho H₂S okanye H₂S engabalulekanga	I-sour media emanzi ene-H₂S
Umda woBulukhuni	Akukho miqathango ikhethekileyo	≤ 22 HRC / 248 HBW
Unyango lobushushu	Ukucubungula okuqhelekileyo	Isakhiwo esiqhelekileyo okanye se-Q&T; esifanayo
Uvavanyo olongezelelweyo	Uvavanyo lwempembelelo yobushushu obuphantsi	Uvavanyo lwe-SSC + HIC ngokwemigangatho ye-NACE
Ukuthobela i-NACE	Ayifuneki	Ithobela i-NACE MR0175

Iingcebiso zoKhetho: Ngexesha lesigaba soyilo, kubalulekile ukumisela ukuba i-H₂S ikhona na kwindawo yenkonzo. Ukuba kukho iimeko ze-H₂S ezimanzi, iinkcukacha zokuthengwa kufuneka zichaze ngokucacileyo "i-A333 Gr.6 yeNkonzo eSour, ehambelana ne-NACE MR0175 / ISO 15156," kunye neemfuno ezicacileyo zobunzima, ukulingana kwekhabhoni, unyango lobushushu, kunye novavanyo olongezelelweyo. Imibhobho eqhelekileyo ye-A333 Gr.6 akufuneki isetyenziswe kwimidiya eyomileyo, njengoko oku kunokukhokelela ekuqhekekeni okukhulu koxinzelelo.