Loaʻa i ka Duplex stainless steel he microstructure ʻelua-phase kahi o ka hapa nui o ka ferrite a me ka austenite e pili ana i 50%. Ma muli o kā lākou microstructure ʻelua-phase, ua hui kēia mau mea kila i nā waiwai maikaʻi loa o ka ferritic a me ka austenitic stainless steels. ductility.
ʻO ka hui pūʻana o kēia mau waiwai ke kumu i hoʻohana nuiʻia ai nā kila kila duplex i loko o ka petrochemical, pulp a me ka pepa, ka moana a me ka hana mana.
Hiki i nā mea ikaika kiʻekiʻe ke hōʻemi i ka mānoanoa a me ke kaumaha. No ka laʻana, hiki i ka super duplex stainless steel ke hāʻawi i ʻekolu a ʻehā mau manawa kiʻekiʻe o ka ikaika a me ke kūpaʻa kiʻekiʻe i ka pitting corrosion ma mua o 316 stainless steel.
Hoʻokaʻawale ʻia nā kila kila ʻole Duplex i ʻekolu mau māka e pili ana i ka gravimetric chromium (Cr) content a me ka pitting resistance equivalent number (PREN):
ʻO kekahi o nā mea koʻikoʻi o ka welding DSS, SDSS, HDSS a me nā mea kila kila kila kūikawā, ʻo ia ka hoʻomalu ʻana i nā ʻāpana welding.
No ka la'ana, koi ka DSS i ka PREN o 35 a me SDSS i PREN o 40. Hō'ike ke ki'i 1 i ka DSS a me kona metala ho'opihapiha pili no GMAW a me GTAW. 'O ka ma'amau, e like ka Cr o ka metala piha me ka metala kumu. ʻAʻole kūlike ka metala ma muli o ka ʻenehana maikaʻi ʻole, hiki ke hāʻawi i ka metala hoʻopihapiha over-alloyed i ka PREN makemake a me nā waiwai ʻē aʻe no ka laʻana welded.
Ma ke ʻano he laʻana e hōʻike ai i kēia, ʻōlelo kekahi mau mea hana e hoʻohana i ka uea hoʻopihapiha SDSS (25% Cr) no nā alapili DSS-based (22% Cr), a me HDSS filler wire (27% Cr) ma SDSS (25% Cr) based alloys. , 5% molybdenum a ua manaʻo ʻia he emi ma lalo o 0.015% kalapona haʻahaʻa.
Ke hoʻohālikelike ʻia me SDSS, ʻoi aku ka ikaika o ka hoʻoulu ʻana o ka HDSS a ʻoi aku ka maikaʻi o ke kūʻē ʻana i ka lua a me ka crevice corrosion.
Hāʻawi ʻia i ka laulā o nā mea kumu, nā koi mechanical a me nā kūlana lawelawe, e noʻonoʻo e kūkākūkā me kahi noi DSS a me ka loea hoʻopihapiha hoʻopihapiha ma mua o ka hoʻomaka ʻana i kāu papahana aʻe.
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