ʻO ke kila kila he kila kila kiʻekiʻe e hiki ai ke pale aku i ka ʻino i ka ea a i ʻole nā mea hoʻoheheʻe kemika. ʻAʻole pono ke kila kila e hana i ka mālama ʻana i ka ʻili e like me ke kala kala, akā hiki ke loaʻa iā ia nā waiwai kūlohelohe o ke kila kila. Mai kahi hiʻohiʻona metallographic, loaʻa ka chromium i ke kila kila, kahi kiʻi chromium lahilahi loa ma ka ʻili. Hiki i kēia kiʻiʻoniʻoni ke hoʻokaʻawale i kanā hoʻoheheʻe kila kuhiliʻolemai ka hoʻokomo ʻana i ka oxygen, pēlā e hāʻawi ai i ka pale ʻana i ka corrosion. No ka mālama ʻana i ke kūpaʻa corrosion kūlohelohe o ke kila kila, ma ka ʻōlelo maʻamau, pono e loaʻa i ke kila kila ma mua o 12% chromium.
ʻO 347 ke kila kila ma ka pae ASTM A240/240M. He kila kuhiliʻole austenitic. Ma Kina, ʻo 0Cr18Ni11Nb ka papa kūpono o 347 stainless steel. No ka mea, aia ka nui o ka niobium (Nb) element, 347 stainless steel he kū'ē maikaʻi i ka corrosion crystallographic, a he kiʻekiʻe ka ikaika a me ka plasticity. ʻO 347 ke kila kila maikaʻi ke kūpaʻa oxidation a me ka weldability i ka ea ma lalo o 800 ° C.
ʻO 347 ke kila kila maikaʻi ke kūpaʻa i ka corrosion i loko o nā pāpaʻi kemika e like me nā waikawa, alkalis, a me nā hopena paʻakai. ʻOi aku ka maikaʻi o ka hana ʻana o ke koʻikoʻi wela kiʻekiʻe a me ke kūpaʻa kiʻekiʻe kiʻekiʻe o ka creep resistance stress mechanical properties o 347 stainless steel ma mua o ka304 kila kila. He ākea loa kona mau papa noi, e like me ka mokulele, ka hana mana, kemika, ʻoihana petrochemical, meaʻai, hana pepa,pahu puka, etc.
ʻO ka hui kemika o 347 stainless steel penei:
Kalapona C: ≤0.08%
Silicon Si: ≤1.00%
Manganese Mn: ≤2.00%
ʻO Phosphorus P: ≤0.045%
Sulfur S: ≤0.030%
Chromium Cr: 17.00~19.00
Nikela Ni: 9.00~12.00
Niobium Nb: ≥10*C %
ʻO nā waiwai mechanical o 347 stainless steel (solid solution state) penei:
Ka ikaika hua (N/mm2) ≥205
Ka ikaika uʻi (N/mm2) ≥515
Elongation (%) ≥ 40
Paʻakiki: HB: ≤187
Ka manawa hoʻouna: Dec-09-2023