347 o se niobium-o loʻo i ai austenitic uʻamea uʻamea, ae 347H o lona maualuga carbon version. I le tulaga o le tuufaatasiga,347e mafai ona vaʻaia o se mea faʻapipiʻi e maua mai i le faʻaopopoina o le niobium i le faʻavae o le 304 stainless steel. O le Niobium o se elemene e le masani ai le eleele e galue tutusa ma le titanium. Pe a faʻaopoopoina i le uʻamea, e mafai ona faʻamamaina le fausaga o saito, tetee i le faʻaleagaina o le intergranular, ma faʻamalosia le faʻamaʻaina o tausaga.
Ⅰ. E fetaui ma tulaga fa'ale-atunuu
| Saina | 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. FA'AVAE FA'AVAE O S34700 pa uamea
| Vasega | C | Mn | Si | S | P | Fe | Ni | Cr |
| 347 | 0.08 maualuga | 2.00max | 1.0 maualuga | 0.030 maualuga | 0.045 maualuga | 62.74 min | 9-12max | 17.00-19.00 |
| 347H | 0.04 – 0.10 | 2.0 maualuga | 1.0 maualuga | 0.030 maualuga | 0.045 maualuga | 63.72 min | 9-12max | 17.00 – 19.00 |
Ⅲ.347 347H pa uamea uamea Meatotino Fa'ainisinia
| Malosi | Lisi Lisi | Malosi Tetele (MPa) min | Malosi e maua 0.2% Fa'amaoniga (MPa) min | Elongation (% i le 50mm) min |
| 8.0 g/cm3 | 1454 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 40 |
Ⅳ. Meatotino
①E sili atu le tete'e o le pala e fa'atusatusa i le 304 u'amea u'amea.
② I le va o le 427 ~ 816 ℃, e mafai ona faʻalavelaveina le faʻavaeina o le chromium carbide, tetee atu i le faʻalogo, ma e lelei le teteʻe atu i le pala.
③O loʻo i ai pea se faʻalavelave fetolofi i totonu o se siosiomaga faʻamaʻi malosi ma le maualuga o le vevela o le 816 ℃.
④ Faʻafaigofie ona faʻalautele ma faʻapipiʻi, faigofie ona faʻafefe.
⑤Le lelei maualalo vevela faigata.
Ⅴ. Talosaga taimi
O le faatinoga maualuga-vevela o347&347Huamea stainless e sili atu nai lo le 304 ma le 321. E masani ona faaaoga i vaalele, petrochemical, meaai, pepa ma isi alamanuia, e pei o paipa autu exhaust ma paipa lala o afi afi, paipa kasa vevela o turbine compressors, ma i uta laiti. ma le vevela e le sili atu i le 850°C. Vaega e galue i lalo o tuutuuga, ma isi.
Taimi meli: Me-11-2024