347 yog niobium-muaj austenitic stainless hlau, thaum 347H yog nws cov qib siab carbon. Nyob rau hauv cov nqe lus ntawm composition,347 ibNws tuaj yeem pom tau tias yog ib qho khoom siv tau los ntawm kev ntxiv niobium rau lub hauv paus ntawm 304 stainless hlau. Niobium yog lub ntiaj teb tsis tshua muaj zog uas ua haujlwm zoo ib yam li titanium. Thaum ntxiv rau cov hlau, nws tuaj yeem kho cov qauv nplej, tiv thaiv intergranular corrosion, thiab txhawb lub hnub nyoog hardening.
Ⅰ.Ua raws li cov qauv hauv tebchaws
| Tuam Tshoj | TSI 20878-2007 | 06Cr18Ni11 Nb | 07Cr18Ni11Nb (1Cr19Ni11Nb) |
| US | ASTM A240-15a 1 | S34700, 347 | S34709, 347 H |
| JIS | J1S G 4304:2005 | TIAB SA 347 | - |
| DIN | TS EN 10088-1-2005 | X6CrNiNb18-10 1.4550 | X7CrNiNb18-10 1.4912 |
Ⅱ.CHEMICAL COMPOSITION OF S34700 Stainless hlau bar
| Qib | C | Mn | Si | S | P | Fe | Ni | Cr |
| 347 ib | 0.08 max | max 2.00 Nws | 1.0 max | 0.030 max | 0.045 max | 62,74m ib | 9-12 max | 17.00-19.00 Nws |
| 347 h ua | 0.04-0.10 Nws | 2.0 max | 1.0 max | 0.030 max | 0.045 max | 63,72m ua | 9-12 max | 17.00 – 19.00 dr hab |
Ⅲ.347 347H Stainless hlau bar Mechanical Properties
| Qhov ntom | Melting Point | Tensile zog (MPa) min | Yield zog 0.2% Pov thawj (MPa) min | Elongation (% hauv 50mm) min |
| 8.0 g / cm3 | 1454 ° C (2650 ° F) | Psi - 75000, MPa - 515 | Psi - 30000, MPa - 205 | 40 |
Ⅳ.Material properties
① Zoo heev corrosion kuj piv rau 304 stainless hlau.
② Nruab nrab ntawm 427 ~ 816 ℃, nws tuaj yeem cuam tshuam qhov tsim ntawm chromium carbide, tiv taus rhiab heev, thiab muaj kev tiv thaiv zoo rau intergranular corrosion.
③Nws tseem muaj qee qhov nkag siab tsis zoo hauv qhov chaw muaj zog oxidizing nrog qhov kub ntawm 816 ℃.
④ Yooj yim rau txuas thiab tsim, yooj yim rau vuam.
⑤ Qhov kub thiab txias toughness.
Ⅴ.Application zaus
Kev ua haujlwm siab kub ntawm347 thiab 347 Hstainless hlau yog zoo dua li ntawm 304 thiab 321. Nws yog dav siv nyob rau hauv aviation, petrochemical, zaub mov, ntawv thiab lwm yam lag luam, xws li tso lub ntsiab kav thiab ceg kav ntawm aircraft engine, kub gas pipes ntawm turbine compressors, thiab nyob rau hauv me me loads. thiab kub tsis tshaj 850 ° C. Cov khoom uas ua haujlwm raws li cov xwm txheej, thiab lwm yam.
Post lub sij hawm: May-11-2024