Kupu Whakataki
Ko te karaehe 304 te kowiri tira paerewa "18/8"; koinei te kowiri tira tino maha ngā whakamahinga, ā, koia te mea tino whānui te whakamahinga, e wātea ana i roto i te whānuitanga o ngā hua, ngā āhua me ngā whakaotinga atu i tētahi atu. He tino pai ngā āhuatanga hanga me te whakarewa. Nā te hanganga austenitic taurite o te Karaehe 304 ka taea te kume hohonu rawa me te kore e whakamahanahia, ā, nā tēnei i tino kaha ai tēnei karaehe i roto i te hanga o ngā wāhanga kowiri tira kume pērā i ngā totohu, ngā oko tuwhera me ngā kohua. Mō ēnei tono he mea noa te whakamahi i ngā momo motuhake "304DDQ" (Deep Drawing Quality). Ka taea te hanga ngāwari i te Karaehe 304 ki te pakaru, ki te huri rānei hei momo wāhanga mō ngā tono i roto i ngā mara ahumahi, hoahoanga, me te kawe waka. He tino pai hoki ngā āhuatanga whakarewa o te Karaehe 304. Kāore e hiahiatia te whakamahana i muri i te whakarewa i te wā e whakarewahia ana ngā wāhanga angiangi.
Ko te karaehe 304L, te putanga waro iti o te 304, kāore e hiahiatia he whakamahana i muri i te whakarewanga, nō reira he whānuitia te whakamahinga i roto i ngā wāhanga taumaha (neke atu i te 6mm). Ko te karaehe 304H me tōna ihirangi waro teitei ka kitea te whakamahinga i ngā pāmahana teitei. Mā te hanganga austenitic ka tino pakari ēnei karaehe, tae noa ki ngā pāmahana cryogenic.
Ngā Āhuatanga Matua
Kua tohua ēnei āhuatanga mō te hua papatahi kua hurihia (pereti, rau me te koiri) i roto i te ASTM A240/A240M. Kua tohua ngā āhuatanga ōrite engari kāore e tino ōrite mō ētahi atu hua pēnei i te paipa me te pae i roto i ā rātou whakaritenga.
Te hanganga
Kei te ripanga 1 ngā awhe hanganga noa mō ngā maitai kowiri tira 304.
| Tau | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 304 | meneti mōrahi | - 0.08 | - 2.0 | - 0.75 | - 0.045 | - 0.030 | 18.0 20.0 | - | 8.0 10.5 | - 0.10 |
| 304L | meneti mōrahi | - 0.030 | - 2.0 | - 0.75 | - 0.045 | - 0.030 | 18.0 20.0 | - | 8.0 12.0 | - 0.10 |
| 304H | meneti mōrahi | 0.04 0.10 | - 2.0 | - 0.75 | -0.045 | - 0.030 | 18.0 20.0 | - | 8.0 10.5 | |
Ripanga 1.Ngā awhe hanganga mō te maitai kore waikura 304
Ngā Āhuatanga Mīhini
Kei te ripanga 2 ngā āhuatanga ā-pūkaha noa mō ngā maitai kowiri tira 304.
Ripanga 2.Ngā āhuatanga hangarau o te maitai kore waikura 304
| Tau | Kaha Kume (MPa) min | Kaha Hua 0.2% Whakamātautau (MPa) min | Te roa (% i roto i te 50mm) min | Te pakeketanga | |
| Rockwell B (HR B) mōrahi | Brinell (HB) mōrahi | ||||
| 304 | 515 | 205 | 40 | 92 | 201 |
| 304L | 485 | 170 | 40 | 92 | 201 |
| 304H | 515 | 205 | 40 | 92 | 201 |
| Me rite anō hoki te rahi o te kōpaka ki te ASTM Nama 7, ki te rahi matotoru rānei mō te 304H. | |||||
Ātete ki te Waikura
He tino pai i roto i ngā momo taiao hau me ngā momo waikura maha. Ka taea te waikura i ngā wāhi pakaru me ngā kapiti i roto i ngā taiao hauota mahana, ā, ka pakaru te waikura ahotea i runga ake i te 60°C. E kiia ana he ātete ki te wai inu me te 200mg/L o ngā hauota i ngā pāmahana taiao, ka heke ki te 150mg/L i te 60°C.
Ātete Wera
He pai te ātete waikura i roto i te ratonga wā poto ki te 870°C me te ratonga tonu ki te 925°C. Kāore i te tūtohutia te whakamahi tonu i te 304 i roto i te awhe 425-860°C mēnā he mea nui te ātete waikura i muri mai. He ātete ake te karaehe 304L ki te maturuturunga waro, ā, ka taea te whakamahana ki roto i te awhe pāmahana i runga ake nei.
He kaha ake te kaha o te karaehe 304H i ngā pāmahana teitei, nō reira he maha ngā wā e whakamahia ana mō ngā tono hanganga me ngā tono pupuri pēhanga i ngā pāmahana neke atu i te 500°C tae atu ki te 800°C. Ka pāngia te 304H e te awhe pāmahana 425-860°C; ehara tēnei i te raruraru mō ngā tono pāmahana teitei, engari ka iti ake te ātete ki te waikura wai.
Te Maimoatanga Wera
Maimoatanga Wairewa (Whakamahana) – Whakamahanahia ki te 1010-1120°C ka whakamatao wawe. Kāore e taea te whakapakeke i ēnei momo mā te maimoatanga wera.
Whakarewa
He tino pai te whakarewa mā ngā tikanga whakakotahi paerewa katoa, me ngā konganuku whakakī, me te kore rānei. Ka whakamanahia e te AS 1554.6 te whakarewa o te 304 me te Tau 308 me te 304L me ngā tokotoko, ngā irahiko rānei 308L (me ō rātou rite silicon teitei). Ko ngā wāhanga whakarewa taumaha i te Tau 304 me whakamahana i muri i te whakarewa kia nui ai te ātete ki te waikura. Kāore tēnei e hiahiatia mō te Tau 304L. Ka taea hoki te whakamahi i te Tau 321 hei whakakapi mō te 304 mēnā e hiahiatia ana te whakarewa wāhanga taumaha, ā, kāore e taea te maimoatanga wera i muri i te whakarewa.
Ngā tono
Ko ngā tono noa ko:
Ngā taputapu tukatuka kai, inā koa i roto i te hanga pia, te tukatuka miraka me te hanga waina.
Ngā paepae kīhini, ngā totohu, ngā oko, ngā taputapu me ngā taputapu
Ngā panera hoahoa, ngā reera me ngā whakapaipai
Ngā ipu matū, tae atu ki ngā mea hei kawe waka
Ngā Whakawhiti Wera
Ngā mata whatu, ngā mata whakarewa rānei mō te keri maina, te keri kōhatu me te tātari wai
Ngā here miro
Ngā Puna
