ʻO ke kila kila Martensitic kila kila he ʻano kila kila chromium e mālama ana i ka microstructure martensitic i ka mahana o ka lumi, nona nā waiwai hiki ke hoʻoponopono ʻia e ka mālama wela (quenching a me ka tempering). Ma ke ʻano laulā, he ʻano kila kila paʻakikī. Ma hope o ke kaʻina hana quenching, tempering a me ka annealing, ua hoʻomaikaʻi nui ʻia ka paʻakikī o ke kila kila 440 ma mua o nā kila kila kila ʻē aʻe a me ke kūpaʻa wela. Hoʻohana pinepine ʻia ia i ka hana ʻana i nā bearing, nā mea ʻokiʻoki, a i ʻole nā mea hoʻoheheʻe plastik e pono ai nā ukana kiʻekiʻe a me ke kūpaʻa ʻana i ke kapa ma lalo o nā kūlana corrosive. ʻO ke kila kila kila maʻamau ʻAmelika 440 e komo pū ana me: 440A, 440B, 440C, 440F. Ua piʻi mau ka ʻike kalapona o 440A, 440B a me 440C. ʻO 440F (ASTM A582) kahi ʻano kila ʻoki manuahi me ka ʻike S i hoʻohui ʻia ma ke kumu o 440C.
Nā Papa like o 440 SS
| ʻAmelika | ASTM | 440A | 440B | 440C | 440F |
| UNS | S44002 | S44003 | S44004 | S44020 | |
| Kepanī | JIS | SUS 440A | SUS 440B | SUS 440C | SUS 440F |
| Alemania | DIN | 1.4109 | 1.4122 | 1.4125 | / |
| Kina | GB | 7Cr17 | 8Cr17 | 11Cr17 9Cr18Mo | Y11Cr17 |
Ka Hoʻohui Kemika o 440 SS
| Nā Papa | C | Si | Mn | P | S | Cr | Mo | Cu | Ni |
| 440A | 0.6-0.75 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440B | 0.75-0.95 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440C | 0.95-1.2 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440F | 0.95-1.2 | ≤1.00 | ≤1.25 | ≤0.06 | ≥0.15 | 16.0-18.0 | / | (≤0.6) | (≤0.5) |
Nānā: ʻae ʻia nā waiwai i loko o nā pale a ʻaʻole koi ʻia.
Paʻakikī o 440 SS
| Nā Papa | Paʻakikī, Annealing (HB) | Ka mālama wela (HRC) |
| 440A | ≤255 | ≥54 |
| 440B | ≤255 | ≥56 |
| 440C | ≤269 | ≥58 |
| 440F | ≤269 | ≥58 |
E like me ke kila kila maʻamau, ʻo ke kila kila Martensite 440 series o Saky he mau ʻano o ka paʻakikī ma o ka quenching, a hiki ke loaʻa i kahi ākea o nā waiwai mechanical ma o ka mālama wela like ʻole. Ma keʻano laulā, loaʻa iā 440A ka hana paʻakikī maikaʻi loa a me ka paʻakikī kiʻekiʻe, a ʻoi aku ka kiʻekiʻe o kona paʻakikī ma mua o 440B a me 440C. ʻOi aku ka paʻakikī a me ka paʻakikī o 440B ma mua o 440A a me 440C no nā mea hana ʻoki, nā mea hana ana, nā bearings a me nā valves. ʻO ka 440C ka paʻakikī kiʻekiʻe loa o nā kila kila a pau a me ke kila kūpaʻa wela no nā mea hana ʻoki kiʻekiʻe, nā nozzles a me nā bearings. He kila ʻoki manuahi ʻo 440F a hoʻohana nui ʻia i nā lathes aunoa.
Ka manawa hoʻouna: Iulai-07-2020