ʻO F51, F53, F55, F60 a me F61 he mau kapa kila kila kila ʻelua a me super duplex i lawe ʻia mai ASTM A182. ʻO kēia maʻamau kekahi o nā maʻamau i kuhikuhi nui ʻia no ka hoʻolako ʻana i nā kila kila.
ʻO ka American Society of Testing and Materials (ASTM) kekahi o nā hui kūlana kiʻekiʻe loa o ka honua, e nānā ana, e hōʻuluʻulu a hoʻopuka i nā kūlana ʻenehana no ka nui o nā mea waiwai. Paʻi ʻia nā maʻamau e hoʻomaka me ka huaʻōlelo 'A' uhi metala.
ʻO ke kūlana ASTM A182 ('Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service') aia i kēia manawa i kāna 19th edition (2019). I ka wā o kēia mau paʻi ʻana, ua hoʻohui ʻia nā mea hoʻohui hou a hoʻokaʻawale i kahi helu 'papa' hou. Hoʻonohonoho ka prefix 'F' i ka pili o kēia maʻamau i nā huahana hoʻopunipuni. Hoʻohui hapa ʻia ka suffix helu e ke ʻano alloy ie austenitic, martensitic, akā ʻaʻole ia i kuhikuhi ʻia. Ua helu ʻia nā kila duplex i kapa ʻia ʻo 'Ferritic-Austenitic' ma waena o F50 a me F71, me nā helu piʻi e pili ana i nā māka i hoʻohui hou ʻia.
ʻO nā ʻano like ʻole o Duplex Stainless Steels
Ua like ka ASTM A182 F51 me UNS S31803. ʻO kēia ka huaʻōlelo kumu no ka 22% Cr duplex stainless steel. Eia nō naʻe, e like me ka wehewehe ʻana i kahi ʻatikala ma mua, ua hoʻomaikaʻi nā mea hana i ka haku mele ʻana i ka hopena kiʻekiʻe o nā palena e hoʻomaikaʻi ai i ka pitting corrosion resistance. ʻO kēia papa, me kahi kikoʻī ʻoi aku ka paʻakikī, ua kapa ʻia ʻo F60, e hoʻohālikelike ana me UNS S32205. No laila, hiki iā S32205 ke hōʻoia ʻelua-hōʻoia e like me S31803 akā ʻaʻole ka hope. Loaʻa ia ma kahi o 80% o ka duplex stainless steel production. Nā waihona ʻo Langley AlloysSanmac 2205, ʻo ia ka huahana proprietary a Sandvik e hāʻawi 'i ka machinability hoʻonui e like me ke kūlana'. Mai ka ½” a hiki i ka 450mm anawaena mau pahu paa, a me na kaola puka a me ka papa pu kekahi.
Ua like ka ASTM A182 F53 me UNS S32750. ʻO kēia ka 25% Cr super duplex stainless steel i hoʻolaha nui ʻia e Sandvik asSAF2507. Me ka hoʻonui ʻana i ka chromium i hoʻohālikelike ʻia me F51 hāʻawi ia i ka hoʻomaikaʻi ʻana i ka pitting corrosion resistance. ʻOi aku ka ikaika o ka hoʻoulu ʻana, e ʻae ana i nā mea hoʻolālā ʻāpana e hōʻemi i ka nui o ka ʻāpana no nā noi lawe ukana. Hoʻopaʻa ʻo Langley Alloys i nā lāʻau paʻa SAF2507 mai Sandvik, ma nā nui mai ka ½" a hiki i ka 16" anawaena.
Ua like ka ASTM A182 F55 me UNS S32760. Hiki ke huli ʻia ke kumu o kēia papa i ka hoʻomohala ʻana o Zeron 100 e Platt & Mather, Manchester UK. ʻO ia kekahi super duplex stainless steel e pili ana i kahi haku mele 25% Cr, akā me ka hoʻohui o tungsten. Nā waihona ʻo Langley AlloysSAF32760mau kaola paʻa mai Sandvik, ma ka nui mai ka ½” a hiki i ka 16” anawaena.
Ua like ka ASTM A182 F61 me UNS S32550. ʻO kēia, ʻo ia hoʻi, kahi kokoke o Ferralium 255, ke kila kila kila super duplex i haku ʻia eLangley Alloys. Hoʻokuʻu ʻia i ka makahiki 1969, ua hāʻawi ʻia i kēia manawa ma mua o 50 mau makahiki i ka lawelawe kūleʻa i kahi ākea o nā noi koi. Hoʻohālikelike ʻia me F53 a me F55 e hoʻonui i ka ikaika a me ka hana corrosion. ʻOi aku ka ikaika o kona haʻahaʻa haʻahaʻa ma mua o 85ksi, ʻoiai ua kaupalena ʻia nā māka ʻē aʻe i 80ksi. Eia kekahi, loaʻa iā ia a hiki i ka 2.0% o ke keleawe, e kōkua ana i ka pale ʻana i ka corrosion. Nā waihona ʻo Langley AlloysFerralium 255-SD50i ka nui mai ka 5/8" a hiki i ka 14" anawaena paa paa, me na papa a hiki i ka 3" ka manoanoa.
Ka manawa hoʻouna: Mar-06-2020