2205 duplex stainless hlau yeeb nkab muaj cov cuab yeej zoo heev, corrosion kuj, thiab zoo weldability. Nws yog dav siv hauv kev lag luam roj thiab roj, marine engineering, tshuaj lom neeg kev lag luam thiab lwm yam lag luam. Qhov ntev ntawm cov roj thiab cov kav dej tau muab tso rau hauv cov khoom siv stainless hlau duplex hauv kev lag luam roj thiab roj tau tshaj 850Km, thiab feem ntau ntawm lawv yog 2205 duplex stainless hlau seamless steel kav (qee yam yog S31803 duplex stainless hlau kav, 2507 duplex stainless hlau kav) ; West-East Gas Pipeline Vim yog qhov muaj zog corrosive ntawm qhov nruab nrab ntawm cov pa roj carbon monoxide hauv qhov project, cov kav dej muaj zog yog tag nrho ua los ntawm 2205 duplex stainless hlau.
2205 duplex steel yeeb nkab ua ke nrog cov khoom muaj txiaj ntsig zoo tshaj plaws ntawm ferrite thiab austenite thiab muaj kev tiv thaiv zoo rau chloride ion kev ntxhov siab corrosion tawg. Nws yog duplex stainless hlau muaj li ntawm 21% chromium, 2.5% molybdenum thiab 4.5% nickel-nitrogen alloy. Lub zog tawm los yog ob zaug ntawm austenitic stainless hlau. Qhov tshwj xeeb no tso cai rau cov neeg tsim qauv kom txo qhov hnyav thaum tsim cov khoom, muab cov hlau no kom zoo dua 316 thiab 317L. Vim nws cov ntsiab lus chromium thiab molybdenum siab, cov hlau no muaj kev tiv thaiv zoo heev rau pitting thiab uniform corrosion. Lub dual-theem microstructure xyuas kom meej tias cov hlau muaj kev ua haujlwm siab rau kev ntxhov siab corrosion cracking thiab siab mechanical zog.
2205 duplex stainless hlau yeeb nkab tshuaj muaj pes tsawg leeg
|
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
N |
|
Tsawg dua lossis sib npaug rau 0.030 |
Tsawg dua los yog sib npaug rau 1.00 |
Tsawg dua lossis sib npaug rau 2.00 |
Tsawg dua lossis sib npaug rau 0.030 |
Tsawg dua lossis sib npaug rau 0.015 |
4.50~6.50 |
21.00~23.00 |
2.90~3.50 |
0.14~0.20 |
|
- |
Ob chav hlau 2205 |
304 |
316L |
|
|
| Corrosion kuj | Tsis kam rau chloride kev nyuaj siab corrosion |
>1000 |
47 |
152 |
40% Cacl 2 100 degree corrosion cracking lub sij hawm (h) |
| Pitting corrosion kuj coefficient PREN |
- |
35.4 |
18.4 |
25.9 |
Qhov loj dua PREN coefficient, qhov muaj zog tiv thaiv pitting corrosion. |
| Ua haujlwm rau intergranular corrosion | |||||
| Uniform corrosion kuj g.(m2.h)-1 |
0.021 |
57 |
12.1 |
20% H2So4 60 degree 100h |
|
| Fatigue corrosion kuj Ntau dua los yog sib npaug | |||||
| Mechanical zog | Tensile zog Rm((Mpa) Ntau dua los yog sib npaug rau |
620 |
485 |
485 |
1020-1100 degree |
| Yield zog Rp0.2(Mpa) Ntau dua lossis sib npaug |
- |
450 |
170 |
170 |
1020-1100 degree |
| Elongation A50 (%) Ntau dua lossis sib npaug |
25 |
40 |
40 |
1020-1100 degree |
|
| Hardness(Brimnell/Rockwell) Tsawg dua los yog sib npaug |
290/30.5 |
187/90 |
187/90 |
1020-1100 degree |
|
| Lub cev muaj zog | Thermal conductivity w / (m. degree) |
19 |
18 |
15 |
20-100 degree |
| Linear expansion coefficient (10-5/ degree) |
- |
13.7 |
16 |
16 |
20-100 degree |
