ADI Railway Wedge Austempered Ductile iron

Description:
Casting Material:	Austempered Ductile Iron, ADI 1200 / QTD 1200-3 / JS 1200-3 / EN-GJS 1200-3 / FCAD-1200-2 / ASTM A 897/M-16 1200-4
Design Software:	CAD, PRO/E, SolidWorks, UG
Casting Process:	Sand Coated Casting, Lost Foam Casting, Investment Casting
Heat Treatment：	Austempering
Machining:	Casting+CNC Machining
Surface finishing:	Shot blasting, Galvanized/Hot dip galvanized, Powder coated, Spray painting
Package：	Fumigation-free pallet or Wooden Box

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ADI Railway Wedge Austempered Ductile iron

The railway wedge—also called friction wedge or bogie wedge—is a one-piece casting that sits between the bolster and side frame of a freight-truck bogie. Its main jobs are:

Increase yaw damping to suppress hunting and car-body sway.

Lock bogie geometry, keeping wheel-sets parallel and gauge true.

Self-feed as faces wear, maintaining preload without re-tightening. - Compensate for temperature and humidity changes, ensuring a stable friction coefficient.

Correct material and installation directly decide the life, performance and reliability of the entire rail system.

Why ADI?

Tensile ≥ 1 200 MPa – 1.8× forged steel, yet 10 % lighter.

Elongation ≥ 4 % – absorbs impact without brittle fracture.

Fatigue limit 400-500 MPa** – doubles life under 20 kN cyclic shear.

Stable μ 0.28-0.34** from -50 °C to +70 °C, verified by CRRC tests.

Near-net casting** – 18 % machining cost saved.

ADI 1200-4 Material Properties:

Property	Value / Requirement	Unit	Remarks
Tensile strength Rm	≥ 1200	MPa	Mill test 1200-1320
Yield strength Rp0.2	≥ 900	MPa	+50 MPa vs 2020 edition
Elongation after fracture A	≥ 5	%	Min. for grade ADI 1200-5
Brinell hardness HBW	340-410	-	Guidance, wall ≤30 mm
Impact energy KV (un-notched, room temp.)	≥ 55	J	Mill test 55-75
Rotating-bending fatigue limit σw	560-660	MPa	~12 % above ADI 1050
Contact fatigue limit σH	2 000-2 400	MPa	Above carburized low-alloy steel
Modulus of elasticity E	≈ 169	GPa	Same as lower grades
Density ρ	7.1	g·cm⁻³	~10 % lighter than steel
Graphite nodularity	≥ 85	%	GB/T 24733-2023 requirement
Graphite count	≥ 100	pcs/mm²	Same as above
Matrix structure	Ausferrite + trace carbides	-	Other phases <5 %

ADI Railway Wedge Austempered Ductile iron

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