75kg Rail
Compact · Durable · Cost-effective — A high‑strength I‑section heavy‑haul rail designed for 30–35 tonne axle loads, combining exceptional wear resistance, fatigue performance and long‑term stability for heavy freight lines, industrial spurs and mining railways.
Key Points
High load capacity: Nominal 75 kg/m (theoretical mass 74.414 kg/m); engineered for sustained 30–35 t axle loads.
Excellent wear and crack resistance: Alloy chemistry plus optional surface hardening increases head hardness to 380–420 HBW, significantly extending service life.
Material options: U71Mn for cost‑effective heavy‑haul service; U75V (vanadium‑bearing) for high‑abrasion, high‑impact applications.
Long‑length and jointless support: Standard 12.5 m / 25 m lengths and custom 100 m long rails for continuous welded rail (CWR) systems.
Stringent quality control: 100% ultrasonic inspection, drop‑weight impact testing and visual checks; straightness ≤ 0.3 mm/m.
Material Options & Typical Mechanical Properties
U71Mn (recommended for standard heavy‑haul)
Tensile strength ≥ 880 MPa
Yield strength ≥ 580 MPa
Elongation ≥ 10%
U75V (vanadium alloy, for high wear/impact sections)
Tensile strength ≥ 980 MPa
Yield strength ≥ 680 MPa
Elongation ≥ 8%
Technical Specifications
| Item | Specification / Notes |
|---|---|
| Nominal mass | 75 kg/m (theoretical mass 74.414 kg/m) |
| Cross‑section | I‑section rail |
| Head width | 75 mm |
| Web thickness | 20 mm |
| Foot width | 150 mm |
| Rail height | 192 mm |
| Standard lengths | 12.5 m / 25 m (100 m custom long rails available) |
| Length tolerance | ±20 mm |
| Bolt hole diameter | 31 mm |
| Bolt hole spacing | 600 mm |
| Surface hardness (optional) | 380–420 HBW (after head quenching) |
Typical Applications
Heavy‑haul mainlines: Freight corridors with annual tonnages above 60 million tonnes and operating speeds ≥ 120 km/h.
Metro lines (heavy‑duty sections): Heavily trafficked urban lines where heavy‑duty rails are specified.
Mining railways: Internal mine haulage and steep‑grade operations with frequent heavy loads.
Industrial spurs & port terminals: High‑frequency, high‑abrasion loading/unloading zones.
Competitive Advantages
Superior load capacity: >20% higher bearing capacity than 60 kg/m rails — ideal for 30 t+ axle weights.
Lower life‑cycle cost: Extended service life and longer maintenance intervals reduce total cost of ownership by ~25–30%.
Wide environmental adaptability: Material and surface treatment options for cold environments (down to −40°C), coastal/haline atmospheres, etc.
Strong compatibility & customization: Supports 100 m long‑rail custom orders and conforms to standard hole/Bolt spacing for turnouts and sleepers.
Manufacturing & Quality Assurance Highlights
Refining: Desulfurization + secondary furnace refining to minimize harmful inclusions and segregation.
Rolling: Universal rolling mill with tight control of cross‑section tolerances to ensure profile accuracy.
Straightening & finishing: Combined planar and vertical straightening; straightness controlled to ≤ 0.3 mm/m.
Head quenching (optional): Selective induction hardening for high‑wear track segments.
Final inspection: 100% ultrasonic flaw detection, drop‑weight impact testing and dimensional/verbal inspection prior to shipment.
Selection & Purchasing Recommendations
Standard heavy‑haul corridors (60–80 million tonnes/year): Choose U71Mn for a balanced cost/performance solution.
High‑wear or high‑impact segments (ports, loading pockets): Choose U75V and/or head‑quenched rails.
CWR (continuous welded rail) requirements: Order 100 m long rails and ensure professional welding and stress‑relief procedures.
Lead times: Standard lengths are readily available; bulk custom orders typically require production lead time — discuss with sales at time of inquiry.
FAQs
Q:How is rail durability validated?
A:Each batch is supplied with ultrasonic inspection, impact test and chemical/ mechanical test certificates. On‑site fatigue life estimation should be done based on axle loads, traffic density and wheel/rail profiles.
Q:Do you offer head hardening?
A:Yes — induction quenching of the rail head is available and recommended for high‑wear segments.