Rail Shoulders (Cast-in Rail Shoulders)

Raw Material

QT500-7

QT450-10

QT400-15

Standard Reference

GB 1348-88

GB 1348-88

GB 1348-89

Rail Shoulder 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

Tensile Strength

≥500 Mpa

≥450 Mpa

≥400 Mpa

Yield Strength

≥320 Mpa

≥310 Mpa

≥250 Mpa

Elongation(%)

≥7

≥10

≥15

Hardness

170~230HB

160~210HB

130~180HB

Metallographic organization

Ferrite + Pearlite

Graphite + Ferrite + Pearlite

Ferrite

Surface

Plain, Hot Dip Galvanized, Sandblasting