1. Melao ea ho phethahatsa
Netefatsa mofuta oa morao-rao oa ASTM A333/A 333M (motsoako oa lik'hemik'hale oa mofuta ka mor'a 2016 o lokisoe, 'me lithibelo tse ncha tse kang Cr, Ni, le Mo lia eketsoa).
2. Taolo ea sebopeho sa lik'hemik'hale
Meeli ea lintlha tsa bohlokoa:
C≤0.30% (khabone e tlaase e tiisa ho tiea), Mn 0.29-1.06% (e fetotsoe ka litaba tsa C), P≤0.025%, S≤0.025% (fokotsa ka ho hlaka lintho tse kotsi).
Phetolelo ea 2016 e eketsa meeli e ka holimo bakeng sa Ni, Cr, Mo, joalo-joalo (joaloka Ni≤0.40%), 'me hoa hlokahala ho hlahloba hore na buka ea tiisetso e tšoauoa ka carbon equivalent (CET).
Ntlafatso ea thepa: Mofuta o mocha oa A333GR6 o ntlafalitsoe ho tloha ho tšepe ea C-Mn ho ea ho tšepe e tlase ea alloy, ka ts'ebetso e ntle.
1. Thepa ea mechine
Matla a thata ≥415MPa, tlhahiso ea matla ≥240MPa, karo-karolelano ea matla a poelo e tlase (e bonts'ang bokhoni ba deformation ea polasetiki)
Teko ea tšusumetso e tlase ea mocheso:
Thempereichara ea teko e fapana le botenya ba lebota (joaloka -45 ℃~-52 ℃), 'me litlhoko tsa konteraka li tlameha ho boleloa ka ho hlaka.
Boleng ba matla a tšusumetso bo tlameha ho kopana le maemo, hangata a hlokang ≥20J (bona ASTM A333 bakeng sa lintlha).
2. Sebopeho sa Metallographic
Boemo ba phepelo bo lokela ho ba ferrite e tšoanang + pearlite, ka boholo ba lijo-thollo 7 ~ 9 (lithollo tse mahoashe li ka fokotsa tekanyo ea matla a lihlahisoa).
Ka ho khetheha khetha liphaephe tsa tšepe tse tingoeng + tse halefileng (mohaho o halefile troostite, 'me mocheso o tlase o thata o betere).
Mokhoa oa phekolo ea mocheso
Litlaleho tsa phekolo ea mocheso li tlameha ho fanoa: ho futhumatsa ≥815℃→ ho tima metsi → ho halefa ho netefatsa ho tšoana ha mohaho.
Qoba boemo ba pele bo sa phekoloeng kapa bo sa tšoaroeng hantle (mohaho o mahoashe o lebisa ho brittleness e tlase ea mocheso).
Boemo ba thomello
Hangata e fanoa ka boemo bo tloaelehileng + bo halefileng kapa bo tingoeng + bo halefileng, bo hlokang ho hlalosoa ho konteraka.
1. Botenya ba marako le ho amahanngoa ha mocheso
Mohlala: ha botenya ba lebota e le 7.62mm, mocheso oa tlhahlobo ea tšusumetso o hloka ho fihla ho -52 ℃ (tlase ho feta -45 ℃).
Litlhaloso tse tloaelehileng tsa sebaka: 8-1240mm×1-200mm (SCH5S-XXS), tlhokahalo ea sebele e hloka ho hlahlojoa.
2. Lisebelisoa tse ling tse lekanang
A333GR6≈X42N/L290N/API 5L B PSL2 (peipi ea mohala), empa hoa hlokahala ho netefatsa hore na ts'ebetso e tlase ea mocheso e fihletsoe.
E tlameha ho hlahloba litokomane
Setifikeiti sa lintho tse bonahalang (MTC), tlaleho ea kalafo ea mocheso, tlaleho ea tlhahlobo ea mocheso o tlase, tlaleho ea tlhahlobo e sa senyeheng (UT/RT).
Ka mor'a phetolelo ea 2016, lintlha tsa tlhahlobo ea lisebelisoa tsa alloy tse sa tsoa eketsoa (Ni, Cr, joalo-joalo) li tlameha ho kenngoa.
Tlhahlobo ea motho oa boraro
Ho khothaletsoa ho hlahloba hape lintho tsa bohlokoa (joalo ka tlhahlobo ea phello, sebopeho sa lik'hemik'hale) ka lisampole, haholo bakeng sa lits'ebetso tse kotsi haholo (joalo ka liphaephe tsa LNG).
Boemo ba mocheso
Thempereichara e etselitsoeng ho sebetsa ≥-45℃, maemo a mocheso a tlase haholo (joalo ka -195℃) a hloka ho lekola hore na ho hlokahala sehlopha se hodimo (jwalo ka A333GR3/GR8).
Tšebeliso ea indasteri
Petrochemical (ethylene, LNG), lisebelisoa tsa sehatsetsi, liphaephe tsa cryogenic, joalo-joalo, li hloka ho nahana ka ts'ireletso e eketsehileng (joalo ka ho roala) ho latela ho bola ha mahareng.
Litšoaneleho le ts'ebetso
Khetha ka ho khetheha bahlahisi ba nang le mangolo a tlhahiso ea ASTM A333, 'me u hloka linyeoe tsa phepelo bakeng sa merero e ts'oanang.
Ela hloko boitšoaro ba "OEM" ba barekisi 'me u netefatse litokomane tsa pele tsa tiisetso ea feme.
Theko le nako ea ho fana
Mofuta o tlase oa alloy (pele ho 2016) o ka ba le theko e tlase, empa phapang ea ts'ebetso e kholo, mme ts'ebetso e felletseng ea litšenyehelo e ea hlokahala.
Litlhaloso tse khethehileng (tse kang liphaephe tse teteaneng tse bophara ba bophara bo boholo) li ka 'na tsa hloka ho etsoa ka mokhoa o ikhethileng, ho atolosa potoloho ea ho fana.
Kotsi ea pherekano: U se ke ua ferekanya A333GR6 le A335GR6 (tšepe ea chromium-molybdenum bakeng sa mocheso o phahameng).
Thepa ea khale e tloaelehileng: Netefatsa hore na phala ea tšepe e hlahisoa ka mor'a phetolelo ea 2016 ho qoba likarolo tsa alloy tsa lihlahisoa tsa khale tsa khale tse sa finyelle litekanyetso.
Ts'ebetso ea ho tjheseletsa: Mocheso o tlase oa mocheso oa tšepe oa tšepe o hloka lisebelisoa tse ts'oanang tsa welding (joalo ka ENiCrMo-3), mme mofani oa thepa o lokela ho fana ka tataiso ea welding.
Ka lintlha tse kaholimo, moreki a ka lekola ka mokhoa o hlophisehileng ho latela melao, ho bapisa ts'ebetso le ts'epo ea mofani oa phaephe ea alloy A333GR6 ho netefatsa polokeho le moruo oa morero.
Nako ea poso: Jun-12-2025
