L'application | UIC54 | UIC60 |
115Re, ,50kg Rail, 60kg rail,
BS80lbs, BS100lbs, ect. |
Nom | QT500-7 | QT450-10 | QT400-15 |
Standard | Go 1348-88 | Go 1348-88 | Go 1348-89 |
Chemical Composition(%) |
C:3.60-3.80 | C:3.40-3.90 | C:3.50-3.60 |
C:3.60-3.80 | Mn:0,2-0,5 | Mn :≤0,5 | |
Si:2.50-2.90 | Si:2.70-3.00 | Si:3.0-3.2 | |
P :≤0,08 | P :≤0,07 | P :≤0,07 | |
S :≤0,025 | S :≤0,03 | S :≤0,02 | |
Résistance à la traction | ≥500 Mpa | ≥450 Mpa | ≥400 Mpa |
La force de rendement | ≥320 Mpa | ≥310 Mpa | ≥250 Mpa |
L'allongement(%) | ≥7 | ≥10 | ≥15 |
La dureté | 170~230HB | 160~210HB | 130~180HB |
Métallographiques
Organisation |
De la ferrite & perlite | Graphite & & perlite de ferrite | De la ferrite |