Cast iron rail to rail cast materials process, method:

Track casting materials: grey cast iron HT250 (GB/T9439-88)

Track casting: sand;

Molding material: sand, clay, sand, sand cores, resin-bonded sand.

Ground rail mechanical properties: tensile strength: ≥ 250N/mm2 hardness: HB=190-240

Rail Machining accuracy:

Surface roughness of less than 0.3mm (full length);

The surface is not more than 1.0mm (full length);

Straightness in the full length is not more than 8mm.

Cast iron Rails to make the production process are as follows:

Snag → design → production → casting first time tempered (heat treatment) → roughing finishing → → → second temper processing tests.

Installation technical data

1.Track depth from ground adorned with flat or slightly higher 3-5mm.

2.Rail installation, any 1mLength of horizontal deviation of not more than 1mm Length is not greater than 2mm Orbit corresponding to this point of the horizontal deviation of not more than 1mm,Between each track of the parallel degree deviation is less than 2mm.

3.Rail fixation in the inside of the track on both sides as required space (About 500-700mm)Use M8Metal expansion screw or nail fixed firmly. Rail bottom surface and the ground must be close, there shall be no deficiency across the gap, to orbit after the load to prevent bending.

4Casting materials, and methods

Track casting materials: grey cast iron HT250(GB/T9439-88)

Track casting: sand;

Molding material: sand, clay, sand, sand cores, resin-bonded sand.

Ground rail mechanical properties: tensile strength: ≥250N/mm2 Stiffness: HB=190-240

5Machining accuracy

Surface roughness of not greater than 0.3mm(In full length);

The surface line is not greater than 1.0mm(In full length);

Linearity within the full length is not more than 8mm.