P65 / R65 Rail U71Mn | GOST 51685 Heavy Rail

Rail & Fittings, Steel Rail

P65 / R65 Rail U71Mn | GOST 51685 Heavy Rail

P65 rail, also widely known as R65 rail, is the standard heavy-duty steel rail for 1520mm broad gauge railway systems across Russia, Central Asia, and all CIS countries. Manufactured in full compliance with GOST 51685 industrial standards, this 65kg-class heavy rail features optimized cross-section design, high wear resistance, and excellent structural stability under heavy axle loads and high-volume freight traffic.

Compared with standard 1435mm gauge UIC60 rail, P65/R65 rail has a larger section size, heavier linear weight, and stronger overall bearing capacity, making it the preferred rail profile for mainline railways, heavy-haul freight routes, and large-scale industrial transit lines in broad-gauge regions. Strict dimensional tolerance control and professional heat treatment options ensure long service life and low maintenance costs for long-term railway operation.

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Product Detail

Chemical Component

Standard & Dimension Parameters Table

Executive Standard: GOST 51685 (Latest Version)

Rail Type: P65 / R65 Heavy Steel Rail

Applicable Gauge: 1520mm Broad Gauge

Item	Specification Value
Theoretical Weight	64.88 kg/m
Total Rail Height	180 mm
Rail Base Width	150 mm
Rail Head Width	73 mm
Web Thickness	18 mm
Flange Thickness	20.5 mm

Steel Grade Options

Our P65/R65 broad gauge heavy rail is mainly produced in U71Mn steel grade, the most mainstream and widely approved material for standard 1520mm railway projects. Balancing stable mechanical performance, excellent weldability, cost-effectiveness and strong environmental adaptability, U71Mn P65/R65 rail is the preferred choice for most passenger-freight mixed railway lines and conventional freight routes in CIS and Central Asian regions.

U71Mn Standard Grade (Core Product): The default mass-production steel grade for P65/R65 heavy rail. It features uniform material texture, stable hardness and fatigue resistance, compliant with GOST 51685 standard. Suitable for conventional passenger lines, mixed traffic lines and general freight railway projects, covering most conventional railway construction and renovation demands. Optional rail head hardening treatment is available to further enhance wear resistance for medium-load freight routes.

Chemical Composition（GOST 51685）

Element	Content Range (%) – U71Mn
C (Carbon)	0.68 – 0.78
Si (Silicon)	0.60 – 0.90
Mn (Manganese)	1.00 – 1.30
P (Phosphorus)	≤ 0.030
S (Sulfur)	≤ 0.030
Cr (Chromium)	≤ 0.15
V (Vanadium)	Trace

Mechanical Properties（GOST 51685）

Mechanical Index	Standard Value – U71Mn
Tensile Strength	≥ 880 MPa
Yield Strength	≥ 480 MPa
Elongation	≥ 9%
Surface Hardness (Rail Head)	280 – 320 HB (Normal) / 340 – 380 HB (Optional Head Hardened)
Low-temperature Impact Toughness	Stable operational performance at -35℃ low-temperature environment

Application Scenarios

U71Mn P65/R65 heavy rail is the most widely used track material for 1520mm broad-gauge conventional railway systems. With balanced performance and high cost performance, it is universally applicable to various conventional railway infrastructure and industrial track projects in broad-gauge regions:

Conventional passenger & freight mixed main lines in Russia, Uzbekistan, Kazakhstan and other CIS Central Asian countries
Medium-volume freight railway lines with conventional axle load requirements
General industrial dedicated tracks, port branch lines and conventional mining auxiliary railway lines
Daily railway renovation, track replacement and new conventional railway construction projects
Ordinary trunk lines requiring stable performance and low daily maintenance costs