43 kg/m Rail P43
Product Overview
The P43 (43 kg/m) rail is manufactured to GB2585-2007 and is available in 50Mn or U71Mn grades. With a theoretical weight of 44.653 kg/m (measured ≈ 44.635 kg/m) and a rail height of 140 mm, this rail balances strength, wear resistance and economy — an ideal choice for freight branch lines, yard tracks, industrial railways, ports and a range of mining applications.
Key Benefits
High strength & toughness — tensile strength ≥ 880 MPa, yield strength ≥ 580 MPa, elongation ≥ 10%, providing reliable load capacity and fatigue resistance.
Excellent wear resistance — U71Mn grade reaches approx. 260 HB, extending service life and reducing maintenance.
Cost-effective — more economical than 50 kg/m or 60 kg/m rails, suitable where heavy line capacity is not required.
Standards-compliant & ready to install — produced to GB2585-2007 with drilled bolt holes at both ends for straightforward fishplate and splice bar connections.
Flexible supply — standard lengths 12.5 m and 25 m; custom lengths between 12–25 m available on request.
Technical Specification
Type: P43 (43 kg/m)
Theoretical weight: 44.653 kg/m (measured ≈ 44.635 kg/m)
Rail height: 140 mm
Base width: 114 mm
Head width: 70 mm
Web thickness: 14.5 mm
Materials: 50Mn or U71Mn (high-manganese steel)
Hardness (U71Mn): ≈ 260 HB
Mechanical properties: Tensile strength ≥ 880 MPa; Yield strength ≥ 580 MPa; Elongation ≥ 10%
Standard lengths: 12.5 m, 25 m (custom 12–25 m)
Standard: GB2585-2007 “Hot-rolled rails”
Comparison Table
| Feature | P43 (43 kg/m) | 50 kg/m | 60 kg/m |
| Theoretical weight (kg/m) | 44.653 | 51.514 | 60.64 |
| Rail height (mm) | 140 | 152 | 176 |
| Typical use | Branch lines, industrial, yards, mining | Mainline, heavier freight | High-speed & heavy axle loads |
| Advantage | Best value for medium duty | Balanced performance | Highest load & stability |
Typical Applications
Freight branch lines and yard tracks
Secondary/mainline tie-ins and short connectors
Industrial plant internal lines and port/terminal tracks
Track renewal and maintenance projects where balanced cost and performance are required
Ideal Mining Applications
P43 is particularly well suited to many mining scenarios where moderate load, good wear resistance and cost-efficiency are required:
Underground main haulage roadways: Primary horizontal haulage for medium-production mines (approx. 1.0–3.0 million tonnes/year).
Production-area transport systems: Rails for local inclines/declines and section drifts within the mining district (used for ore movement between working faces and local conveyors).
Auxiliary transport lines: Non-primary routes used for material deliveries, equipment transfer and personnel commutes.
Small-to-medium open-pit mines: Short-haul ore or waste transport roads where haul distances are typically < 5 km.
Shaft guide rails / skip guideways: Guidance rails for hoisting containers (skips) in some small and medium shafts — suitable where guide-run stability and wear life matter.
Installation & Maintenance
Use matched sleepers and fastening systems specified for 43 kg/m rails to ensure proper gauge and track geometry.
Inspect bolted joints and fishplates regularly — the joint area typically shows accelerated wear.
Monitor head wear and rail profile for scheduled grinding or replacement.
For poor subgrade (soft soil) conditions, evaluate upgrading the ballast/bed or consider a heavier rail section.
In mining environments, increase inspection frequency in dust/abrasive conditions and ensure secure fastening against vibration from mobile equipment.
FAQs
Q:What materials are available?
A:Common grades are 50Mn and U71Mn (high-manganese steels). U71Mn offers higher wear resistance (≈260 HB) while 50Mn is widely used for a balance of toughness and cost.
Q:What are the main use cases for P43?
A:Branch lines, yard tracks, industrial lines, port terminals, and mining applications — e.g., underground main haulage, production area drifts, auxiliary lines, short open-pit haul roads and some skip/shaft guideways.
Q: How does U71Mn compare to 50Mn?
A:U71Mn has better wear resistance and hardness (longer life in abrasive environments). 50Mn offers good toughness and is generally more cost-effective. Choose based on wear environment and lifecycle costs.