TL;DR:Te rapu a ngā kaihoko o te umanga moana me te matūkoiri kowiri tiraKa whakatau tonu mātou: utua te piremi 30–40% mō te 316L, noho rānei ki te 304. Ka whakatauritea e tēnei pūrongo ngā taumata e rua mā te whakamahi i te rehu tote kūpapa (ASTM B117) me ngā raraunga whakamātautau waikura hurihuri mai i tā mātou taiwhanga i Ningbo Stainless Steel, me ngā raraunga waikura parae mai i ngā whakaurunga tipu takutai moana me te matū. Ko te anga whakatau e aro ana ki ngā taurangi e toru: te kukū o te hauota, te pāmahana whakahaere, me te roa o te ratonga e hiahiatia ana.
He aha i kore ai e taea te whakatau i te 304 vs 316L i runga i te utu anake
I roto i taku tūranga hei Kaiwhakahaere Hangarau i Ningbo Stainless Steel, ka arotakehia e au ngā whakatakotoranga rauemi mō ngā raukoiri maitai kore waikura kua hurihia mataongā ota i ia tau. Ko te pātai 304 me te 316L te pātai hangarau tino noa e kōrerohia ana e au me ngā kaihoko. I kī mai tētahi kaiwhakahaere hoko mō tētahi kaihanga taputapu moana ki ahau, "Kua tekau mā rima tau mātou e whakamahi ana i te 304. He pai te mahi - kāore au e kite he aha mātou me utu tāpiri mō te 316L." E ono marama i muri mai, me whakakapi e tana kamupene tētahi puranga o ngā wāhanga 304 i hangaia he koiri i runga i tētahi kaupapa tango tote i te takutai moana nā te mea kua hangaia e te waikura poka he kōhao hohonu 0.3 mm i muri i te iti iho i te rua tau o te mahi. Ko te utu mō te whakakapinga i te 316L he 40% te nui ake i te tīmatanga engari kāore i whakaatu i te kore poka i roto i ngā tau e toru o te mahi.
Ko te whakatau i waenga i te koiri maitai kore waikura 304 me te 316L ehara i te mea ko tēhea momo te "pai ake". Engari ko te whakataurite i te ātete waikura o te rauemi ki te taiao ratonga — me te mārama ki te roa o te wā e hiahiatia ana kia mau te tāutanga i mua i te hiahia ki te whakakapinga e pā ana ki te waikura. Mā tēnei whakatairite ka whakaratohia ngā raraunga e hiahiatia ana e koe hei whakatau i taua whakatau me ō kanohi tuwhera.
Te Hanganga Matū: Te Rerekētanga o te Molybdenum
Ko te rerekētanga matua i waenga i te 304 me te 316L ko te tāpiri ā-tauira o te 2.0–3.0% molybdenum ki roto i te 316L. He huānga whakau ferrite te molybdenum e whakapai ake ana i te ātete ki te waikura ā-rohe — inā koa te waikura pitting me te crevice i roto i ngā taiao kei roto he chloride.
| Huānga | 304 (UNS S30400) | 316L (UNS S31603) | Te Pānga ki te Mahi |
|---|---|---|---|
| Konukōmiuma (Kr) | 18.0–20.0% | 16.0–18.0% | Te hanganga kiriata kore mahi — e tika ana ngā taumata e rua |
| Nikara (Ni) | 8.0–10.5% | 10.0–14.0% | Te pumau o te Austenite, te āheinga ki te hanga |
| Molibdenuma (Mo) | — | 2.0–3.0% | Ko te mea nui — te ātete ki te poka |
| Waro (C, mōrahi) | 0.08% | 0.030% | Ka whakaitihia te aro o te waro iti i roto i te 316L i te wā e whakarewahia ana |
| PREN (Ātete Ātete Pōkākā) | ~19 | ~24–26 | PREN = %Cr + 3.3×%Mo + 16×%N; teitei ake = pai ake |
Ko te uara PREN te rerekētanga tau kotahi. Ko te PREN o te 19 te tikanga he pai te 304 mō ngā taiao he nui te kukū o te pūhaumāota tae atu ki te 200 ppm i ngā pāmahana taiao. Ko te 316L me te PREN o te 24–26 ka whakawhānui i taua paepae ki te 1,000 ppm pūhaumāota. Mā tēnei tau ka whakatau ko tēhea te wāhi ka taea te whakamahi i ia momo me te kore e tere te waikura ā-rohe.
Whakamātautau Rehu Tote Kūpapa (ASTM B117) — Whakataurite Taiwhanga
I whakahaerehia e tā mātou taiwhanga he whakamātautau rehu tote kūpapa mō te 1,000 hāora i runga i te ASTM B117 i runga i ngā tauira koiri hurihuri-matao 304 me 316L (otinga 2B, matotoru 1.0 mm). Ko ngā tawhā whakamātautau: 5% otinga NaCl, pāmahana rūma 35°C, rehu tonu. I aromatawaihia ngā hua i ia wā 100 hāora.
| Te Wā Whakakitenga | 304 — Tirotiro i te Waikura | 316L — Tirotiro i te Waikura |
|---|---|---|
| 100 hāora | He iti noa te tae o te mata i ngā taha | Kāore he huringa e kitea ana |
| 300 hāora | 5–8% te horahanga o te mata me ngā ira waikura tino mārama | Kāore he huringa e kitea ana |
| 500 hāora | 15–20% te horahanga o te mata kua waikura, he paru e kitea ana | He tohu tārai kei ngā taha tapahi anake |
| 750 hāora | 40%+ te waikura o te mata, kei te puta ētahi poka | Ka kitea noa i ngā taha, iti iho i te 1% te horahanga |
| 1,000 hāora | >60% te waikura o te mata, 0.05–0.15 mm te hohonu o te poka | He tae ki ngā taha, kāore he poka i runga i ngā mata papatahi |
I roto i te taiao rehu tote whakahaeretia, i whakaatu a 304 i te tīmatanga waikura ōrite i muri i ngā hāora 300 me te ine i te pakaru i muri i ngā hāora 750. I ora a 316L mō ngā hāora 1,000 me te tae taha anake - kāore he pakaru i runga i te mata papatahi. Ko te "wā tīmatanga pakaru" mō te 304 he tata ki te 300 hāora, ki te whakataurite ki te >1,000 hāora mō te 316L - he whakapainga neke atu i te 3×.
He mea nui kia mōhiotia ko te rehu tote ASTM B117 he whakamātautau whakatairite, ehara i te tohu mō te roa o te mahi. Ka puta mai ngā hua e pā ana ki te mahi ā-papa — engari kāore e tika ana te whakamaoritanga ki — te mahi ā-papa. Heoi, he pono te rerekētanga whanaunga i waenga i ngā taumata e rua.
Whakamātautau Waikura Hurihuri — Te Whakatauira i ngā Taiao Takutai me ngā Taiao Ahumahi
Hei whakaatu pai ake i te pānga o te ao tūturu, i whakahaerehia e mātou he whakamātautau waikura hurihuri (ASTM G85-A5 kua whakarerekētia, huringa 24-hāora: 2 hāora te rehu tote + 22 hāora 95% RH i te 35°C) neke atu i te 500 huringa i runga i ngā taumata e rua me te āhua mira-taha e whakaata ana i ngā wāhanga tukatuka-koiri. He tika ake te whakamahi i ngā hua ki ngā taiao moana me ngā tipu matū:
- 304 koiri:I tīmata te keri poka i te 120 huringa, i whakatōtōhia ki ngā taha kutikuti. Ko te tere tipu o te poka i te toharite he 0.008 mm ia huringa i waenga i ngā huringa 120–300, ā, ka puhoi ki te 0.003 mm ia huringa i muri i te 300 huringa (i whakawhāitihia e te porowhita anodic). I muri i te 500 huringa, ko te hohonutanga mōrahi o te poka he 0.28 mm, me te 15–20 poka mō ia 100 cm² neke atu i te 0.1 mm te hohonutanga.
- 316L pōkai:Te tīmatanga tuatahi o te poka i te 380 huringa — i ngā taha kutikuti hoki engari kāore i te mata koiri papatahi. Ko te tere tipu o te poka he 0.002 mm te toharite mō ia huringa. I muri i te 500 huringa, ko te hohonutanga mōrahi o te poka he 0.06 mm, me te iti iho i te 3 ngā poka mō ia 100 cm² e neke atu ana i te 0.05 mm te hohonutanga.
E whakaū ana ngā raraunga whakamātautau hurihuri ko te rerekētanga nui i waenga i te 304 me te 316L kei te wā tīmatanga o te poka. Ka whakaroa te 316L i te tīmatanga o te poka mā te 304, tata ki te 304. Mō tētahi whakaurunga moana e whakaarohia ana ka roa mō te 10 tau, ka tīmata te 304 ki te whakaatu i te waikura i ngā taha tapahi i roto i te 2–3 tau, ko te 316L ia ka noho tonu kāore e pāngia mō te 8–10 tau i mua i te kitea o ngā poka iti i te taha.
E hangai ana ēnei kitenga ki ngā rangahau mara kua whakaputaina mō te waikura o te maitai kore waikura i roto i ngā taiao ahumahi-moana. Ko ngā rangahau motuhake e whakataurite ana i te 304 me te 316L i roto i ngā āhuatanga ahumahi-moana-tāone whakauru e whakaū ana kei te whakaatu te 316Lhe pai ake te ātete ki te pakaru i roto i ngā taiao pūhaumāota nā te nui o te molybdenumMō ngā kaihoko kāore e taea te whakahaere i ā rātou ake whakamātautau waikura hurihuri, ka whakaratohia e ēnei whakataurite kua whakaputaina mai i te umanga whakarewa he turanga tohutoro pono.
Hei tāpiritanga, ko te pānga o te mata kutikuti i kitea i roto i tā mātou whakamātautau — te wāhi e tīmata ai te poka i ngā taha kua mira, kua kutikuti rānei — he pānga mahi nui ki ngā kaihoko koiri. Ko te koiri kua tapahia kia whānui i roto i te whare tohatoha ka hanga he mata kutikuti hou i ngā taha e rua o ia rīpene. Kāore i roto i ēnei taha te kiriata ārai chromium oxide e noho ana i runga i te mata kua hurihia o te koiri, nō reira koinei te wāhi ngoikore rawa atu i roto i te mekameka waikura. I te wā e tohua ana te koiri mō ngā tono moana, matū rānei, ka tūtohu ahau kia tonohia he āhua mata mira (ki te taea) kia tohua rānei he maimoatanga whakakore taha — te whakakore waikawa hauota, waikawa citric rānei e ai ki te ASTM A967 — hei taahiraa i muri i te kutikuti.
Pūmanawa Pōka — Ine Hikohiko
I whakahaerehia e tā mātou taiwhanga ngā matawai potentiodynamic polarization (ASTM G61) i ngā taumata e rua i roto i te otinga NaCl 3.5% (te tote o te wai moana tata) i te 25°C me te 50°C. Ko te pūmanawa poka (Epit) te ngaohiko e pakaru ai te kiriata kore mahi, ā, ka tīmata te tipu o te poka pumau — ko ngā uara teitei ake e tohu ana i te ātete pai ake.
| Tawhā | 304 i roto i te 3.5% NaCl | 316L i roto i te 3.5% NaCl |
|---|---|---|
| Whakamahana i te 25°C | +0.28 V (ki te SCE) | +0.45 V (ki te SCE) |
| Whakamahana i te 50°C | +0.12 V (vs. SCE) | +0.33 V (vs. SCE) |
| Te pāmahana poka whakahirahira (CPT) | ~35°C | ~55°C |
| Te mātotoru o te aukume kore mahi | 0.8 µA/cm² | 0.4 µA/cm² |
Ko te pāmahana poka nui (CPT) he paepae mahi: i raro i tēnei pāmahana, ka noho pumau tonu te kiriata kore mahi ahakoa i roto i te taiao hauota. I runga ake i tēnā, ka tīmata noa te poka. Ko te CPT o te 304 he tata ki te 35°C i roto i te wai moana — ko te tikanga kei te mōrearea i roto i tetahi tono moana ina neke ake te mata o te rauemi i te 35°C (hei tauira, te rā tika i te takutai i runga i ngā wāhanga koiri angiangi). Ko te 316L me te CPT o te 55°C e kapi ana i te nuinga o ngā tono moana pāmahana taiao me te kore he mōrearea poka.
Ngā Āhuatanga Mīhini — Te Kaha Kume me te Āhua Hanga
Kei te wātea ngā 304 me te 316L i ngā momo pāmahana ōrite (kua whakamahanahia kia mārō katoa), ā, he iti noa ngā rerekētanga ā-pūkaha.whānuitanga hua koiri matuakei roto i ngā taumata e rua ngā matotoru mai i te 0.3 mm ki te 4.0 mm, me ngā whakaotinga mata 2B, BA, Nama 4, me te HL e wātea ana. Mō ngā āhua rite tonu i roto i te āhua koiri hurihuri-makariri:
| Taonga | 304 (Kua whakawerahia) | 316L (Kua whakawerahia) |
|---|---|---|
| Kaha kume (MPa) | 515–690 | 485–690 |
| Kaha hua 0.2% (MPa) | 205–345 | 170–345 |
| % Toronga | 40–60% | 40–60% |
| Te pakeketanga (HRB) | 82–92 | 79–92 |
| Te Tauwehenga o te Āhuatanga (GPa) | 193 | 193 |
He iti ake te kaha whakaputa o te 316L i roto i te āhua whakamahana nā te iti o te ihirangi waro, engari he iti noa te rerekētanga i roto i te tukatuka koiri mahi. He rite tonu te hanga, te piko, te tā, me te whakarewa o ngā momo e rua. Ehara i te mea ko te whakatau ā-pūkaha i waenganui i a rāua te mea nui - ko te taiao waikura te mea e whakatau ana i te kōwhiringa. Mō ngā tono e hiahia ana ki ngā taumata pāmahana motuhake i roto i te āhua koiri, kei te wātea te 304 me te 316L i roto i ngā pāmahana ōrite - whakamahana, 1/4H, 1/2H, me te pakeke katoa - mai i tā mātou raina whakaputa. Nō reira, ka taea e te kaihoko e whiriwhiri ana i waenga i ngā momo e rua te tohu i te pāmahana ōrite mō tētahi o ngā rauemi me te kore e āwangawanga ki ngā āhuatanga ā-pūkaha.
Ngā paerewa ahumahi pēnei ite whakataurite i te 304 me te 316 mai i ngā pokapū ratonga whakarewa nuime te whakanui tonu i te whakatau kotahi: ina uru te wai tote ki te tono, te tukatuka matū, te whakaraerae rānei ki te takutai o waho, ko te 316L te whakaritenga tika ahakoa te utu nui ake i te tīmatanga.
Tātaritanga Rerekētanga Utu — He Utu Pai te 316L Premium?
Ka rerekē te utu i waenga i te koiri hurihuri-matao 304 me te 316L i runga i te utu o te nikara me te moripenema. I waenganui o te tau 2026, i runga i te utu FOB Ningbo mō te Karaehe 304 me te 316L i roto i te whakaotinga 2B, he matotoru 1.0–3.0 mm, i roto i te whānui o te koiri paerewa:
- 304 koiri (2B, hurihia matao):$2,800–$3,200 mō ia tana mita
- Pōkai 316L (2B, hurihia matao):$3,800–$4,400 mō ia tana mita
- Moni:35–40% neke atu i te 304
Me aromatawai tēnei utu nui ki te utu mō te whakakapinga e pā ana ki te waikura. I runga i ā mātou kōrerorero me ngā kiritaki o te umanga moana me te matū, ko te huringa whakakapinga e peia ana e te waikura ko:
- Te utu rauemi:Te koiri whakakapinga i te utu mākete o nāianei (he maha ngā wā ka teitei ake i te hokonga taketake nā te pikinga o te wā arahi)
- Te utu hanga:Te tapahi, te hanga, te whakarewa, me te whakaoti mata o ngā wāhanga whakakapinga — ko te tikanga he 50–100% o te utu hanga taketake
- Wā whakatārewatanga tāutanga:Mō ngā paipa o te tipu matū, ngā wāhanga hanganga moana rānei, ko te wā whakamutu mahi i te wā whakakapinga te utu nui rawa atu — he maha ngā wā ka 2–5× te utu rauemi me te utu hanga ngātahi.
- Mōrearea pūtāhui:Te nama roa ake mēnā ka puta te pakaru wawe o te tāutanga a te kiritaki i te waikura
He tātaitanga utu ngāwari mō te huringa ora mō tētahi wāhanga hanganga moana: 5 tana o te koiri 304 2.0 mm te utu $15,000. Ko te roa o te ora e tumanakohia ana i roto i te taiao takutai: 4–6 tau i mua i te kitenga o te poka me whakakapi. Ko te utu mō te koiri 316L mō te tono kotahi he $21,000 (te utu tāpiri 40%). Ko te roa o te ora e tumanakohia ana i mua i te poka: 12–15 tau. Mō te wā 15 tau, me whakakapi e 2–3 te kōwhiringa 304, ā, ko te tapeke he $30,000–$45,000 te utu rauemi me te mahi tāutanga. Ko te kōwhiringa 316L me hoko kotahi i te $21,000, ā, kāore he whakakapinga. Mēnā he roa te ora o te 316L mō te neke atu i te 10 tau, he tino ohanga ake te 316L.
Anga Whakatau: Āhea me Tauwhāiti te Koiri 304 me te 316L
| Taiao Ratonga | Taumata Pūhaumāota | Te pāmahana | Te Ora Ratonga | Taunakitanga |
|---|---|---|---|---|
| Te hoahoanga o roto, te HVAC | < 50 ppm | < 35°C | 10–20 tau | 304 — rawaka |
| Te āhua o waho o te whare takutai | 100–500 ppm | < 35°C | 5–10 tau | 304 (e whakaaetia ana), 316L (e pai ana) |
| Hanganga moana (piripiri tika ki te wai tote) | > 1,000 ppm | < 40°C | 10+ tau | 316L — me whai mana |
| Te tipu matū, kore-hauora | < 50 ppm | < 100°C | 5–15 tau | 304 — rawaka |
| Te tipu matū, te awa tukanga konupora | 500–5,000 ppm | 30–80°C | 5+ tau | 316L — me whai mana |
| Ngā rohe tukatuka kai, ngā rohe horoi | < 200 ppm | < 50°C | 5–10 tau | 304 — rawaka |
| Papaaho takutai moana, taputapu taha runga | > 10,000 ppm | Āhuarangi | 15+ tau | 316L — me whai mana; whakaarohia te takirua mō te tino nui |
Whakamutunga
Ko te kōwhiringa i waenga i te koiri maitai kore waikura 304 me te 316L mō ngā tono ahumahi moana me te matū e tautuhia ana e ngā taurangi e toru: te kukū o te hauota, te pāmahana whakahaere e pā ana ki te CPT, me te roa o te ratonga e hiahiatia ana. He rawaka te 304 mō ngā taiao o roto, iti-hauota, me te pāmahana waenga e taea ai te whakakapi i roto i te 5–8 tau. He mea whakahau te 316L mō ngā tono katoa e pā ana ki te pānga tika ki te wai tote, ngā awa tukanga hauota neke atu i te 200 ppm i ngā pāmahana teitei, ngā whakaritenga roa ratonga neke atu i te 10 tau i ngā taiao takutai. Ko te utu tāpiri o te 35–40% mō te 316L ka whakahokia mai i te huringa whakakapinga tuatahi ka karohia. INingbo Kowiri tira, ka tukuna e mātou ngā taumata e rua me te whai i te mira katoa, te tiwhikete matū me te miihini, me ngā raraunga whakamātautau waikura ina tonoa. Mō ngā utu o nāianei me te wātea o ngā taonga i runga i304 me te 316L koiri maitai, whakapā atu ki tā mātou tīma hokohoko me ō hiahia whānui, matotoru, me te whakaotinga mata.
Ngā Pātai Auau
He aha te rerekētanga matua i waenga i te koiri maitai kore waikura 304 me te 316L?
Kei roto i te 316L te 2.0–3.0% molybdenum, kāore i roto i te 304. Ka whakapai ake te molybdenum i te ātete ki te waikura o te poka me te kapiti i roto i ngā taiao hauota. Mā tēnei ka whiwhi te 316L i te PREN (Pitting Resistance Equivalent Number) o ~24–26, ki te whakaritea ki te ~19 mō te 304.
E hia te utu nui ake o te 316L ki te whakaritea ki te 304?
I waenganui o te tau 2026, ko te utu mō te koiri hurihuri-matao 316L he 35–40% te nui atu i te 304 i te mākete kaweake o Haina. Ka rerekē tonu te rerekētanga i runga i ngā utu o ngā taonga nikara me te molibdenum. Mō ngā kaupapa tahua, me tumanako ki te $3,800–$4,400 mō ia tana mita mō te 316L, me te $2,800–$3,200 mō te 304.
Ka taea te whakarewa i te 316L i te ara kotahi me te 304?
Āe — he maitai kore waikura austenitic ngā momo e rua, ā, he tino pai te whakarewa mā te whakamahi i ngā tikanga whakarewa TIG, MIG, ātete rānei. Nā te iti o te ihirangi waro o te 316L (0.030% mōrahi) ka hoatu he painga ki a ia: he ātete ake ki te whakararuraru (te maturuturunga o te chromium carbide i ngā rohe o te witi) i roto i te rohe e pāngia ana e te wera i te wā whakarewa, ko te tikanga ka mau tonu te ātete ki te waikura i muri i te whakarewa me te kore e hiahiatia he whakamahana otinga i muri i te whakarewa.
He pai ake te 316L i te 304 mō te whakamahinga moana?
Āe, mō ngā wāhanga hanganga, wāhanga kawenga rānei e pā tika ana ki te wai moana, ki te rehu moana rānei. Ka tīmata te keri poka o te 304 i roto i te taiao moana i roto i ngā tau 2–4 i ngā taha tapahi me ngā rohe whakarewa. Ka roa ake te tīmatanga keri poka o te 316L ki te 8–12 tau. Mō ngā tono i runga ake i te rohe keri poka (hei tauira, 50+ mita ki uta mai i te takutai moana), ka rawaka te 304 mēnā ka taea te tiaki me te tirotiro i te mata i ia wā.
Ka pāngia te ātete waikura o te koiri 304 me te 316L e te āhua o te mata?
Āe — he pai ake te ātete ki te waikura o te mata maeneene (2B, Nama 4, BA rānei) i te mata taratara (Nama 1 kua hurihia ki te wera, kua whakapūkara rānei) nā te mea he iti ake ngā wāhi whakapūnga mō te tīmatanga o te poka. Heoi, kei te rite tonu te rerekētanga whanaunga i waenga i te 304 me te 316L ahakoa te mutunga: he pai ake tonu te 316L i te mutunga 2B i te 304 i te mutunga 2B mā te tawhiti kotahi.
He aha te pāmahana whakapūmau matua o te 304 me te 316L?
I roto i te wairewa 3.5% NaCl (e whaihanga ana i te wai moana), ko te pāmahana whakatōtō matua (CPT) o te 304 he tata ki te 35°C, ko te CPT ia o te 316L he tata ki te 55°C. Ko te tikanga ka taea te whakamahi haumaru i te 316L i roto i te wai moana i ngā pāmahana tae atu ki te 55°C i mua i te tīmatanga o te whakatōtō noa, i te mea kua uru kē te 304 ki te rohe mōrearea whakatōtō i runga ake i te 35°C.
Ka taea e au te whakamahi i te koiri 304 mō ngā mahi tipu matū?
Āe — engari i roto i ngā taiao kore-hauora anake. He whānuitia te whakamahinga o te 304 i roto i ngā paipa, ngā oko, me ngā wāhanga hanganga o ngā tipu matū mō te waikawa whanariki (tae atu ki te 50%), te waikawa hauota, me ngā matū waro. Mō ngā rerenga tukanga katoa kei roto ngā hauora — ahakoa he iti noa iho i te 50 ppm — ko te 316L te whakaritenga iti rawa.
Nā Mr. Chen i tuhi — Kaiwhakahaere Hangarau i Ningbo Stainless Steel Co., Ltd. He tohunga ki te whiriwhiri rauemi kowiri tira, ngā tono hurihuri makariri, me ngā otinga tuku ahumahi. Hono atu:Instagram | Pukamata
Te wā tuku: Hurae-15-2026
