Nhanganyaya
Grade 304 ndiyo yakajairwa “18/8″ stainless; ndiyo inonyanya kushandiswa uye inoshandiswa zvakanyanya simbi isina tsvina, inowanikwa mumhando dzakasiyana-siyana dzezvigadzirwa, mafomu uye kupera kupfuura chero ipi zvayo. Ine maumbirwo akanakisa ekugadzira nekunamata. Zvimedu zvisina tsvina senge sink, hollow-ware uye saucepans kune aya maapplication zvakajairwa kushandisa akakosha "304DDQ" (Deep Drawing Quality) ari nyore mabhureki kana roll akaumbwa mumhando dzakasiyana siyana dzekushandisa muindasitiri, yekuvaka, uye yekufambisa minda isina kuonda zvikamu.
Giredhi 304L, iyo yakaderera kabhoni vhezheni ye304, haidi post-weld annealing uye saka inoshandiswa zvakanyanya mune inorema geji zvikamu (kupfuura 6mm). Giredhi 304H ine yakakwira kabhoni yemukati inowana application pane yakakwirira tembiricha. Iyo austenitic chimiro chinopawo aya mamakisi kusimba kwakanyanya, kunyangwe pasi kusvika kune cryogenic tembiricha.
Key Properties
Izvi zvivakwa zvakataurirwa chigadzirwa chakatenderedzwa (ndiro, shizha uye coil) muASTM A240/A240M. Zvakafanana asi zvisingaite zvakafanana zvivakwa zvinotsanangurwa kune zvimwe zvigadzirwa senge pombi uye bhara mune yavo yakatarwa.
Composition
Yakajairwa yemhando yemhando yegiredhi 304 simbi isina tsvina inopihwa mutafura 1.
| Giredhi | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 304 | min. max. | - 0.08 | - 2.0 | - 0.75 | - 0.045 | - 0.030 | 18.0 20.0 | - | 8.0 10.5 | - 0.10 |
| 304L | min. max. | - 0.030 | - 2.0 | - 0.75 | - 0.045 | - 0.030 | 18.0 20.0 | - | 8.0 12.0 | - 0.10 |
| 304H | min. max. | 0.04 0.10 | - 2.0 | - 0.75 | -0.045 | - 0.030 | 18.0 20.0 | - | 8.0 10.5 | |
Tafura 1.Maumbirwo emhando ye304 giredhi Stainless simbi
Mechanical Properties
Mamichina emhando yegiredhi 304 masimbi asina tsvina anopiwa mutafura 2.
Tafura 2.Mechanical zvimiro zve304 giredhi Stainless simbi
| Giredhi | Tensile Simba (MPa) min | Goho Simba 0.2% Uchapupu (MPa) min | Elongation (% mu50mm) min | Kuoma | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 304 | 515 | 205 | 40 | 92 | 201 |
| 304L | 485 | 170 | 40 | 92 | 201 |
| 304H | 515 | 205 | 40 | 92 | 201 |
| 304H zvakare ine chinodiwa chekukura kwezviyo zveASTM No 7 kana kukora. | |||||
Corrosion Resistance
Yakanakisa munzvimbo dzakasiyana siyana dzemuchadenga uye midhiya yakawanda inoodza. Zvichienderana negomba nekukoromoka munzvimbo dzinodziya dzechloride, uye nekusimbisa ngura inotsemuka pamusoro pe60°C. Inofungidzirwa kuti inoshingirira kumvura inonwiwa inosvika 200mg/L chlorides pane tembiricha yakapoteredza, ichidzika kusvika pa150mg/L pa60°C.
Heat Resistance
Yakanaka oxidation kuramba musevhisi yepakati kusvika 870 ° C uye mukuenderera sevhisi kusvika 925 ° C. Kuenderera mberi kwekushandisa 304 mu 425-860 ° C range haikurudzirwi kana inotevera aqueous corrosion resistance yakakosha. Giredhi 304L inonyanya kushingirira kunaya kwecarbide uye inogona kudziyiswa mukati metembiricha iri pamusoro.
Giredhi 304H rine simba repamusoro patembiricha dzakakwirira saka rinowanzo shandiswa kune zvimiro uye zvine kudzvanywa zvikumbiro patembiricha iri pamusoro pe500°C uye kusvika pa800°C. 304H inozonzwisiswa mukupisa kwe425-860°C; iri harisi dambudziko repamusoro tembiricha yekushandisa, asi inozokonzeresa kuderedzwa kweaqueous corrosion resistance.
Kupisa Kurapa
Solution Kurapa (Annealing) - Kupisa kusvika 1010-1120 ° C uye kutonhora nokukurumidza. Aya mamakisi haagone kuomeswa nekurapa kwekupisa.
Welding
Yakanakisa weldability neyese akajairwa fusion nzira, zvese zvine uye pasina simbi dzekuzadza. AS 1554.6 pre-qualifying welding ye304 neGrade 308 ne304L ine 308L rods kana maelectrodes (uye ane masilicon akaenzana adzo). Zvikamu zvinorema muGiredhi 304 zvinogona kuda post-weld annealing kuti irambe ichiita ngura. Izvi hazvidiwi kuGrade 304L. Giredhi 321 inogona zvakare kushandiswa seimwe nzira kune 304 kana inorema chikamu welding ichidikanwa uye post-weld kupisa kurapwa hakugoneke.
Applications
Yakajairika application inosanganisira:
Midziyo yekugadzira chikafu, kunyanya mukubika doro, kugadzira mukaka & kugadzira waini.
Kicheni mabhenji, singi, zvimwiro, midziyo uye midziyo
Architectural panelling, railings & trim
Makemikari midziyo, kusanganisira yekutakura
Heat Exchangers
Yakarukwa kana welded skrini yekuchera migodhi, kuchera & kusefa kwemvura
Threaded fasteners
Springs
