Puas yog 347 stainless hlau zoo ib yam li 321 stainless hlau?
Tso lus
Puas yog 347 stainless hlau zoo ib yam li 321 stainless hlau?
347 stainless hlau zoo ib yam li 321 stainless hlau nyob rau hauv uas nws yog feem ntau siv raws li ib tug ruaj khov hloov rau hom 304. Txawm li cas los, nyob rau hauv cov ntaub ntawv ntawm 347, lub stabilizer yog columbium. Cov hlau no txhim kho 347 lub peev xwm uas twb muaj lawm los tiv thaiv intergranular corrosion rau qhov ua tau zoo tshaj plaws. Tsis tas li ntawd, columbium tso cai rau 347 rov ua kom sov dua ntawm qhov kub txog 1650 degree F. Vim li ntawd, cov hlau feem ntau siv rau hauv cov khoom siv kub kub xws li gaskets thiab expansion pob qij txha, nrog rau hauv cov foob pob hluav taws cav thiab kev tsim tshuaj.
Ntxiv nrog rau nws cov cua kub tsis kam, 347 muaj kev tiv thaiv zoo dua rau kev nkag thiab kev ntxhov siab tawg corrosion. Qhov no yog lwm qhov zoo dua ntawm Hom 304, vim tias cov yam ntxwv ntawm 347 tuaj yeem ua tau zoo dua rau cov cheeb tsam uas muaj kev ruaj ntseg yog qhov kev txhawj xeeb tseem ceeb.
Hom 347 paub txog nws qhov tsim nyog rau txhua yam kev siv vuam zoo nrog rau kev ua haujlwm kub thiab txias. Txawm li cas los xij, thaum kho cua sov, cov hlau yuav tsum tau muab tso rau hauv qhov kub ntawm 2100 txog 2250 degree F. Qhov no yog vim qhov tseeb tias 347 tsis tuaj yeem ua haujlwm hardened nyob rau hauv kev kho cua sov. Kev txo qis txias yog tib txoj kev uas tuaj yeem siv cov khoom siv siab heev.
Stainless hlau 347H yog lwm stainless hlau nyob rau hauv cov chav kawm ntawv hlau sau los nag lossis daus hardened steels. Nws muaj ntau yam zoo ib yam thiab cov khoom zoo li stainless hlau 347. Ntxiv nrog rau nws cov ntsiab lus carbon ntau dua, cov hlau tsis ruaj khov los ntawm kev sib ntxiv ntawm niobium lossis qee zaum tantalum. Ob qho ntawm cov khoom no tso cai rau 347H kom raug kub siab dua li qib 347 thiab 304 stainless hlau tuaj yeem tiv taus. 347H muaj kev tiv thaiv corrosion siab thiab yog li no feem ntau siv rau hauv kev ntxhov siab, siab corrosion ib puag ncig uas raug feem ntau hnyav. Kev tsim khoom kub kub, chav piping, boiler raj, cov txheej txheem tshuaj thiab cov kev pab cuam txhua yam tau txais txiaj ntsig los ntawm kev ua haujlwm ntawm 347H. Qhov elasticity no, nyob rau hauv lem, yog vim muaj peev xwm nce chromium cov ntsiab lus nyob rau hauv 347H muaj pes tsawg leeg.
Cov hlau nthuav tawm kev ua haujlwm siab nrog cov txheej txheem vuam feem ntau. Nws tuaj yeem kho cua sov tab sis yuav tsis hnov mob. Tsuas yog ua haujlwm txias txaus los ua kom lub zog thiab lub zog ntawm 347H.
Specifications
| STANDARD | 347 | 347H |
|---|---|---|
| UNS | S34700 | S34709 |
Lub cev muaj zog
| DENSITY | 7.96 g/cm 3 / 0.288 lb/in 3 |
| LUB TSEV | 1398 - 1446 (degree) / 2550 - 2635 (degree F) |
| NYIAJ | 1040 - 1100 (degree) / 1900 - 2000 (degree F) |
| QUENCH | Huab cua / dej nrawm |
Tshuaj muaj pes tsawg leeg
| TSEEM CEEB | 347 | 347H |
|---|---|---|
| NI | 17.0 – 20.0 | 17.0 – 19.0 |
| C | 0.08 max | 0.04 – 0.10 |
| MN | 2 0 max | 2 0 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.030 max |
| SI | 1 0 max | 1 0 max |
| CR | 17.0 – 19.0 | 17.0 – 19.0 |
| NB | 10 xC – 1.10 | 8 xC – 1.10 |
