1. Imigangatho yokusetyenziswa
Qinisekisa inguqulelo yamva nje ye-ASTM A333/A 333M (ulwakhiwo lweekhemikhali lwenguqulelo emva kowama-2016 luyalungiswa, kwaye kongezwa imida emitsha yezinto ezifana neCr, Ni, kunye neMo).
2. Ulawulo lokwakheka kweekhemikhali
Imida yezinto eziphambili:
C≤0.30% (ikhabhoni ephantsi iqinisekisa ukuqina), Mn 0.29-1.06% (ihlengahlengiswe ngomxholo we-C), P≤0.025%, S≤0.025% (yinciphisa ngokungqongqo izinto ezinobungozi).
Inguqulelo ka-2016 yongeza imida ephezulu yeNi, Cr, Mo, njl. (ezifana neNi≤0.40%), kwaye kuyimfuneko ukujonga ukuba incwadi yewaranti iphawulwe nge-carbon equivalent (CET).
Ukuphuculwa kwezinto: Uhlobo olutsha lwe-A333GR6 luphuculwe ukusuka kwintsimbi ye-C-Mn ukuya kwintsimbi ye-alloy ephantsi, kwaye lusebenza ngcono.
1. Iimpawu zoomatshini
Amandla okutsalwa ≥415MPa, amandla okukhupha ≥240MPa, umlinganiselo wamandla okukhupha ophantsi (obonisa amandla okuguqula iplastiki)
Uvavanyo lwempembelelo kubushushu obuphantsi:
Ubushushu bovavanyo buyahluka ngokobukhulu bodonga (obufana no -45℃ ~ -52℃), kwaye iimfuno zesivumelwano kufuneka zichazwe ngokucacileyo.
Ixabiso lamandla ombane ochaphazelekayo kufuneka lihlangabezane nomgangatho, odla ngokufuna i-≥20J (jonga i-ASTM A333 ukuze ufumane iinkcukacha).
2. Ulwakhiwo lwe-Metallographic
Imeko yokubonelela kufuneka ifane ne-ferrite + pearlite, enobukhulu beenkozo obuyi-7 ~ 9 (iinkozo ezirhabaxa zinokunciphisa umlinganiselo wamandla esivuno).
Kungcono ukhethe imibhobho yentsimbi ecinyiweyo + eqinisiweyo (isakhiwo siqiniswe yi-troostite, kwaye ukuqina kobushushu obuphantsi kungcono).
Inkqubo yokunyanga ubushushu
Iirekhodi zonyango lobushushu mazibonelelwe: ukufudumeza ≥815℃→ukucima amanzi→ukufudumala ukuqinisekisa ukufana kwesakhiwo.
Kuphephe imeko yokuqala enganyangwanga okanye engalunganga (ulwakhiwo olurhabaxa lukhokelela ekubeni buthathaka kubushushu obuphantsi).
Imeko yokuhanjiswa
Ihlala ihanjiswa kwimeko eqhelekileyo + ethambileyo okanye ecinyiweyo + efudumeleyo, ekufuneka ichazwe kwisivumelwano.
1. Ubukhulu bodonga kunye nokuhambelana kobushushu obunempembelelo
Umzekelo: xa ubukhulu bodonga buyi-7.62mm, ubushushu bovavanyo lokuchaphazela kufuneka bufikelele kwi--52℃ (ngaphantsi komgangatho we--45℃).
Iinkcukacha zendawo eqhelekileyo: 8-1240mm×1-200mm (SCH5S-XXS), imfuno yokwenyani kufuneka ihlolwe.
2. Izinto ezilinganayo ezizezinye
A333GR6≈X42N/L290N/API 5L B PSL2 (umbhobho womgca), kodwa kuyimfuneko ukuqinisekisa ukuba ukusebenza kobushushu obuphantsi kuyafezekiswa na.
Amaxwebhu ekufuneka uwaqwalasele
Isiqinisekiso sezinto (i-MTC), ingxelo yonyango lobushushu, ingxelo yovavanyo lwempembelelo yobushushu obuphantsi, ingxelo yovavanyo olungonakalisiyo (i-UT/RT).
Emva kwenguqulelo ka-2016, idatha yovavanyo lwezinto ezisandula ukongeza i-alloy (Ni, Cr, njl.njl.) kufuneka ifakwe.
Ukuhlolwa kwakhona komntu wesithathu
Kucetyiswa ukuba kuhlolwe kwakhona izinto ezibalulekileyo (ezifana novavanyo lwempembelelo, ukwakheka kweekhemikhali) ngokuthatha iisampulu, ingakumbi kwizicelo ezinobungozi obukhulu (ezifana nemibhobho ye-LNG).
Uluhlu lobushushu
Ubushushu bokusebenza obuyilwe ngokwe-≥-45℃, iimeko zobushushu obuphantsi kakhulu (ezifana ne--195℃) kufuneka zihlole ukuba ingaba umgangatho ophezulu (ofana ne-A333GR3/GR8) uyafuneka na.
Isicelo soshishino
Iikhemikhali zePetrochemical (i-ethylene, i-LNG), izixhobo zokukhenkcisa, iipayipi ze-cryogenic, njl.njl., kufuneka ziqwalasele ukhuseleko olongezelelweyo (njengokugquma) ngokwendlela ezirhwaqelisa ngayo izinto ezisetyenziswayo.
Iziqinisekiso kunye nokusebenza
Khetha ngokukhethekileyo abavelisi abaneemfuno zemveliso ze-ASTM A333, kwaye ufune iimeko zobonelelo kwiiprojekthi ezifanayo.
Lumka ngendlela abarhwebi abaziphatha ngayo "nge-OEM" kwaye uqinisekise amaxwebhu ewaranti yokuqala yefektri.
Ixabiso kunye nexesha lokuhanjiswa
Inguqulelo ye-alloy ephantsi (ngaphambi kowama-2016) isenokuba nexabiso eliphantsi, kodwa umahluko wokusebenza mkhulu, kwaye kufuneka ukusebenza kweendleko ezipheleleyo.
Iinkcukacha ezikhethekileyo (ezifana neepayipi ezinkulu ezinodonga oluqinileyo) zisenokufuna ukwenziwa ngokwezifiso, nto leyo eyandisa umjikelo wokuhanjiswa.
Umngcipheko wokudideka: Musa ukubhidanisa i-A333GR6 ne-A335GR6 (intsimbi ye-chromium-molybdenum yobushushu obuphezulu).
Uluhlu oluqhelekileyo oludala: Qinisekisa ukuba umbhobho wentsimbi wenziwa emva kohlobo luka-2016 ukuze kuthintelwe ukuba izinto ze-alloy zeemveliso ezisemgangathweni ezindala zingahlangabezani nemigangatho.
Inkqubo yokuwelda: Ukuwelda ngemibhobho yentsimbi enobushushu obuphantsi kufuna izixhobo zokuwelda ezifanayo (ezifana ne-ENiCrMo-3), kwaye umthengisi kufuneka anike isikhokelo sokuwelda.
Ngala manqaku angasentla, umthengi unokuvavanya ngokucwangcisiweyo ukuthobela imithetho, ukuhambelana kokusebenza kunye nokuthembeka komthengisi wepayipi ye-alloy ye-A333GR6 ukuqinisekisa ukhuseleko kunye noqoqosho lweprojekthi.
Ixesha leposi: Juni-12-2025
