Qhov sib txawv ntawm 304 stainless hlau thiab 321 stainless hlau
Qhov sib txawv tseem ceeb nyob rau hauv qhov sib ntxiv ntawm titanium rau 321 stainless hlau, thaum 304 stainless hlau tsis. Qhov sib ntxiv no ua rau 321 stainless hlau zoo dua rau siab - daim ntawv thov kub vim nws tiv thaiv carbide nag lossis daus thaum vuam, uas yuav ua rau 304 stainless hlau corrode ntawm qhov kub thiab txias. Ob leeg muaj kev tiv thaiv corrosion, tab sis 321 stainless hlau muaj qhov zoo dua - kub lub zog thiab thermal stability.
Dab tsi yog 321 stainless hlau?
Hom 321 stainless hlau yog stabilized austenitic stainless hlau, zoo ib yam li hom 304 stainless hlau, tab sis nrog ntxiv ntawm titanium. Qhov sib ntxiv ntawm titanium txo lossis tiv thaiv carbide nag lossis daus thaum vuam thiab kub ntawm 800-1500℃F (427-816℃). Tsis tas li ntawd, nws txhim kho cov alloy cov khoom kub-kub.
304 Stainless hlau
Cov khoom xyaw: muaj kwv yees li 18% chromium thiab 8% npib tsib xee.
Daim ntaub ntawv: Haum rau kev xeb dav dav - daim ntaub ntawv tiv taus nyob rau hauv ntau qhov chaw, nrog rau cov khoom siv ua zaub mov thiab kev tsim khoom.
Cov kev txwv: Thaum raug rau siab - qhov kub thiab txias ib puag ncig tom qab vuam, nws yooj yim rau intergranular corrosion ("weld corrosion") vim yog tsim ntawm chromium carbides.
321 Stainless hlau
Muaj pes tsawg leeg: Zoo ib yam li 304 stainless hlau, tab sis nrog ntxiv titanium.
Cov ntawv thov: Tshwj xeeb tsim rau siab - cov ntawv siv kub xws li cov khoom siv boiler, cov khoom siv hluav taws xob, thiab cov tshuab tso pa tawm.
Qhov zoo: Titanium nyiam dua cov pa roj carbon monoxide los tsim cov carbides, yog li tiv thaiv kev tsim ntawm chromium carbides ntawm cov ciam teb, muab nws siab tiv thaiv intergranular corrosion, tshwj xeeb tshaj yog tom qab vuam.
| 304 VS . 321 | 304 Stainless hlau | 321 Stainless hlau |
| Nta | Corrosion kuj, zoo toughness | Abrasion tsis kam, kub tsis kam, creep kuj |
| Qib | 0Cr18Ni9 (0Cr19Ni9) 06Cr19Ni9 S30408 | X10CrNiTi189 321, S32100, TP321 SUS321 |
| Tshuaj muaj pes tsawg leeg |
C: Tsawg dua lossis sib npaug rau 0.08, Si: Tsawg dua lossis sib npaug rau 1.0, Mn: Tsawg dua lossis sib npaug rau 2.0, Cr: 18.0-20.0, Ni: 8.0-10.5, S: Tsawg dua lossis sib npaug rau 0.03, P: Tsawg dua lossis sib npaug rau 0.035, N Tsawg dua lossis sib npaug 0.1 |
S: 0.030, Ni: 9.00-12.00, Cr: 17.00-19.00 Ti: 5C-0.70 |
| Tensile zog (Mpa) | 520 | Ntau dua lossis sib npaug li 520 |
| Conditional yield zog (MPa) | 205-210 | Ntau dua lossis sib npaug rau 205 |
| Elongation (%) | 40% | Ntau dua lossis sib npaug li 40 |
| Hardness | HB187 HRB90 HV200 | Tsawg dua lossis sib npaug rau 187HB; Tsawg dua lossis sib npaug rau 90HRB; Tsawg dua lossis sib npaug li 200HV |
| Qhov ntom | 7,93g 3 | 7,93g 3 |
| Theoretical hnyav | Qhov hnyav (kg)=thickness (mm) * dav (m) * ntev (m) * tus nqi ceev | Qhov hnyav (kg)=thickness (mm) * dav (m) * ntev (m) * tus nqi ceev |
| Siv |
Tableware, txee, sab hauv tsev pipelines, dej rhaub, boilers, dab da dej, tsheb qhov chaw, khoom siv kho mob, khoom siv hauv tsev, tshuaj, khoom noj khoom haus kev lag luam, kev ua liaj ua teb, thiab nkoj qhov chaw. |
Cov tshuab sab nrauv rau kev lag luam chemical, thee, thiab roj av. |
Kub Resistance
| Khoom | 304 Stainless hlau | 321 Stainless hlau |
|---|---|---|
| Qhov siab tshaj plaws Kev Siv Nruam Temp | ~ 870 degree | ~ 925 degree |
| Thermal stability | Nruab nrab | Siab (kev txhim kho tsis kam rau intergranular corrosion) |
Mechanical thiab Corrosion Properties
| Khoom | SIB 304 | 321 SIB |
|---|---|---|
| Tensile zog | ~ 515 MPa | ~ 505 MPa |
| Elongation | Ntau dua lossis sib npaug li 40% | Ntau dua lossis sib npaug li 40% |
| Corrosion Resistance | Zoo heev nyob rau hauv feem ntau ib puag ncig | Zoo ib yam li 304, tab sis zoo dua ntawm qhov kub siab |
Kev sib piv
| Daim ntawv thov | 304 Stainless hlau | 321 Stainless hlau |
|---|---|---|
| Khoom noj khoom haus | ✓ | ✓ (tsawg dua) |
| Cov Khoom Siv Tshuaj | ✓ | ✓ |
| Kub Exchangers / Boilers | ✗ (tso los ntawm temp) | ✓ |
| Jet Engine Parts / Exhausts | ✗ | ✓ (xav tau) |
| Vuam ib puag ncig | ✓ | ✓ (zoo dua yog tias tom qab- vuam kub siab) |
