347 yog cov hlau tsis xeb austenitic uas muaj niobium, thaum 347H yog nws cov carbon siab. Hauv cov nqe lus ntawm cov khoom sib xyaw,347tuaj yeem pom tau tias yog ib qho hlau uas tau los ntawm kev ntxiv niobium rau hauv paus ntawm 304 stainless hlau. Niobium yog ib qho khoom tsis tshua muaj neeg pom uas ua haujlwm zoo ib yam li titanium. Thaum ntxiv rau hauv cov hlau, nws tuaj yeem ua kom cov qauv noob zoo dua, tiv taus kev xeb intergranular, thiab txhawb kom muaj zog thaum laus.
Ⅰ. Ua raws li cov qauv hauv tebchaws
| Tuam Tshoj | GBIT 20878-2007 | 06Cr18Ni11Nb | 07Cr18Ni11Nb (1Cr19Ni11Nb) |
| US | ASTM A240-15a | S34700,347 | S34709,347H |
| JIS | J1S G 4304:2005 | SUS 347 | - |
| DIN | EN 10088-1-2005 | X6CrNiNb18-10 1.4550 | X7CrNiNb18-10 1.4912 |
Ⅱ.KEV SIB TXUAS LUS NTAWM S34700 Stainless hlau bar
| Qib | C | Mn | Si | S | P | Fe | Ni | Cr |
| 347 | siab tshaj 0.08 | 2.00 siab tshaj | 1.0 siab tshaj plaws | 0.030 siab tshaj | 0.045 siab tshaj | 62.74 feeb | 9-12max | 17.00-19.00 |
| 347H | 0.04 – 0.10 | 2.0 siab tshaj plaws | 1.0 siab tshaj plaws | 0.030 siab tshaj plaws | 0.045 siab tshaj | 63.72 feeb | 9-12max | 17.00 – 19.00 |
Ⅲ.347 347H Stainless hlau bar Mechanical Properties
| Qhov Ceev | Melting Point | Lub zog Tensile (MPa) feeb | Lub zog tawm los 0.2% pov thawj (MPa) feeb | Kev ntev (% hauv 50 hli) feeb |
| 8.0 g/cm3 | 1454 °C (2650 °F) | Psi – 75000, MPa – 515 | Psi – 30000, MPa – 205 | 40 |
Ⅳ. Cov khoom siv
① Kev tiv thaiv corrosion zoo heev piv rau 304 stainless hlau.
② Nruab nrab ntawm 427 ~ 816 ℃, nws tuaj yeem tiv thaiv kev tsim cov chromium carbide, tiv taus kev rhiab heev, thiab muaj kev tiv thaiv zoo rau intergranular corrosion.
③Nws tseem muaj qee qhov kev tiv thaiv nkag mus rau hauv qhov chaw muaj zog oxidizing nrog qhov kub siab ntawm 816 ℃.
④ Yooj yim rau kev nthuav dav thiab tsim, yooj yim rau weld.
⑤Zoo kub qis toughness.
Ⅴ. Cov sijhawm thov
Kev ua haujlwm kub siab ntawm347 & 347HCov hlau tsis xeb zoo dua li 304 thiab 321. Nws yog siv dav hauv kev lag luam dav hlau, petrochemical, zaub mov, ntawv thiab lwm yam lag luam, xws li cov kav dej tso pa tawm thiab cov kav dej ceg ntawm cov cav dav hlau, cov kav dej roj kub ntawm cov compressors turbine, thiab hauv cov khoom me me thiab qhov kub tsis tshaj 850 ° C. Cov khoom uas ua haujlwm raws li cov xwm txheej, thiab lwm yam.
Lub sijhawm tshaj tawm: Tsib Hlis-11-2024