Amabanga 321 kanye ne-347 ayinsimbi eyisisekelo ye-austenitic engu-18/8 (iBanga 304) eqiniswe ngokungeziwe kwe-Titanium (321) noma i-Niobium (347).Lawa mabanga asetshenziswa ngoba awazwelani nokugqwala kwe-intergranular ngemva kokushisisa ngaphakathi kwebanga le-carbide lemvula engu-425-850 °C.IBanga lama-321 yizinga elikhethwayo lezinhlelo zokusebenza ezingeni lokushisa elifinyelela cishe ku-900 °C, elihlanganisa amandla aphezulu, ukumelana nokukalwa kanye nokuzinza kwesigaba nokumelana nokugqwala okune-aqueous okulandelayo.
I-Grade 321H iwukuguqulwa kwe-321 enokuqukethwe kwekhabhoni ephezulu, ukunikeza amandla athuthukisiwe ezinga lokushisa eliphezulu.
Umkhawulo nge-321 ukuthi i-titanium ayidluliseli kahle ku-arc enezinga lokushisa eliphezulu, ngakho-ke ayinconywa njengento esebenzisekayo yokushisela.Kulesi simo i-grade 347 iyakhethwa - i-niobium yenza umsebenzi ofanayo wokuzinzisa i-carbide kodwa ingadluliselwa ku-arc welding.Ngakho-ke iBanga lama-347 liyizinga elisetshenziswayo lokushisela i-321. Ibanga lama-347 lisetshenziswa ngezikhathi ezithile kuphela njengempahla yepuleti lomzali.
Njengamanye amamaki e-austenitic, i-321 ne-347 inezici ezinhle kakhulu zokwakheka nokushisela, ibhuleki kalula noma i-roll-forming futhi inezici zokushisela ezivelele.I-post-weld annealing ayidingeki.Futhi banokuqina okuhle kakhulu, ngisho naphansi kwamazinga okushisa e-cryogenic.IBanga 321 alipholishe kahle, ngakho-ke alinconyelwe ukusetshenziswa kokuhlobisa.
I-Grade 304L itholakala kalula emikhiqizweni eminingi, ngakho-ke ngokuvamile isetshenziswa ngaphezu kuka-321 uma imfuneko iwukumelana nokugqwala kwe-intergranular ngemva kokushisela.Kodwa-ke, i-304L inamandla aphansi okushisa kuno-321 ngakho-ke akuyona into engcono kakhulu uma imfuneko iwukumelana nendawo yokusebenza engaphezu kuka-500 °C.
Izakhiwo Eziyinhloko
Lezi zakhiwo zicaciswe emikhiqizweni egoqeke isicaba (ipuleti, ishidi, nekhoyili) ku-ASTM A240/A240M.Izakhiwo ezifanayo kodwa ezingafani ngempela zicaciswe kweminye imikhiqizo efana nepayipi nebha ngokucaciswa kwazo.
Ukwakheka
Ububanzi obujwayelekile bokuqamba bamashidi ensimbi angenasici ebangeni lama-321 bunikezwe kuthebula loku-1.
Ithebula 1.Ububanzi bokwakhiwa kwensimbi engagqwali engu-321-grade
| Ibanga | C | Mn | Si | P | S | Cr | Mo | Ni | N | Okunye | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 321 | imiz. ubuningi | - 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | 0.10 | Ti=5(C+N) 0.70 |
| 321H | imiz. ubuningi | 0.04 0.10 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | - | Ti=4(C+N) 0.70 |
| 347 | imiz. ubuningi | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 13.0 | - | I-Nb=10(C+N) 1.0 |
Izakhiwo Zemishini
Izakhiwo ezijwayelekile zomshini zamashidi ensimbi angenasici ebanga lama-321 anikezwe kuthebula lesi-2.
Ithebula 2.Izakhiwo zemishini yensimbi engagqwali engu-321-grade
| Ibanga | Amandla E-Tensile (MPa) min | Amandla Esivuno 0.2% Ubufakazi (MPa) min | Ubude (% ku-50 mm) min | Ukuqina | |
|---|---|---|---|---|---|
| I-Rockwell B (HR B) ubuningi | I-Brinell (HB) ubuningi | ||||
| 321 | 515 | 205 | 40 | 95 | 217 |
| 321H | 515 | 205 | 40 | 95 | 217 |
| 347 | 515 | 205 | 40 | 92 | 201 |
Izakhiwo Zomzimba
Izakhiwo ezibonakalayo ezijwayelekile zamashidi ensimbi angenasici ebangeni lama-321 anikezwe kuthebula lesi-3.
Ithebula 3.Izakhiwo ezibonakalayo zensimbi engagqwali engu-321 esesimweni esifakwe emanzini
| Ibanga | Ukuminyana (kg/m3) | I-Elastic Modulus (GPA) | I-Mean Coefficient of Thermal Expansion (μm/m/°C) | I-Thermal Conductivity (W/mK) | Ukushisa Okuthize 0-100 °C (J/kg.K) | Ukumelana Nogesi (nΩ.m) | |||
|---|---|---|---|---|---|---|---|---|---|
| 0-100 °C | 0-315 °C | 0-538 °C | ku-100 °C | ku-500 °C | |||||
| 321 | 8027 | 193 | 16.6 | 17.2 | 18.6 | 16.1 | 22.2 | 500 | 720 |
Ukuqhathaniswa Kwencazelo Yebanga
Ukuqhathaniswa kwebanga okulinganiselwe kwamashidi angama-321 ensimbi kunikezwa kuthebula lesi-4.
Ithebula 4.Imininingwane yebanga yensimbi engagqwali engu-321
| Ibanga | Inombolo ye-UNS | Old British | I-Euronorm | I-Swedish SS | I-JIS yaseJapane | ||
|---|---|---|---|---|---|---|---|
| BS | En | No | Igama | ||||
| 321 | I-S32100 | 321S31 | 58B, 58C | 1.4541 | I-X6CrNiTi18-10 | 2337 | I-SUS 321 |
| 321H | I-S32109 | 321S51 | - | 1.4878 | I-X10CrNiTi18-10 | - | I-SUS 321H |
| 347 | S34700 | 347S31 | 58G | 1.4550 | I-X6CrNiNb18-10 | 2338 | I-SUS 347 |
Isikhathi sokuthumela: Jun-06-2023