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P43 Rail GOST 51685 | 1520mm Broad Gauge Medium Light Steel Rail

P43 Rail GOST 51685 | 1520mm Broad Gauge Medium Light Steel Rail

P43 rail is a medium-light flat-bottom rail applied for 1520mm broad gauge railway, manufactured strictly in accordance with GOST 51685 standard. It serves as an economical rail option for lines with lower axle loads and moderate traffic volume.

P43 rail features compact cross-section, stable dimensional tolerance and good machinability. Matched with standard broad-gauge fasteners, sleepers and fishplates. U71Mn is the primary steel grade for P43 rail, with balanced hardness and toughness, reliable weldability and competitive cost. It is extensively adopted for industrial dedicated tracks, station siding lines, mine auxiliary railways and temporary transport lines in Russia, Kazakhstan, Uzbekistan and other CIS & Central Asian countries.

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Product Detail
Chemical Component
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Standard & Dimension Table

Executive Standard: GOST 51685 Rail Type: P43 Steel Rail Applicable Gauge: 1520mm Broad Gauge

ParameterSpecification
Theoretical Weight43.61 kg/m
Total Rail Height140 mm
Rail Base Width114 mm
Rail Head Width70 mm
Web Thickness14.5 mm

 

Steel Grade Introduction — U71Mn

U71Mn is the mainstream grade for P43 rail. It is conventional pearlitic rail steel designed for medium-light service conditions. Core Advantages:

  • Mature manufacturing technology and stable metallurgical quality
  • Sufficient wear resistance for low & medium traffic operation
  • Good on-site welding performance
  • Cost-effective choice for auxiliary lines and industrial tracks
  • Adaptable to common climate conditions across Central Asia

Chemical Composition (U71Mn)

ElementContent Range (%)
C (Carbon)0.65 ~ 0.76
Si (Silicon)0.15 ~ 0.35
Mn (Manganese)1.10 ~ 1.40
P (Phosphorus)≤ 0.030
S (Sulfur)≤ 0.030

 

Mechanical Properties

Inspection implemented according to GB/T 2585; project acceptance follows GOST 51685

Mechanical IndexStandard Value (U71Mn)
Tensile Strength≥ 880 MPa
Yield Strength≥ 500 MPa
Elongation≥ 9%
Rail Head Hardness260 ~ 310 HB

 

Application Scenarios

P43 broad gauge rail is widely used for light & medium-load track projects:

  • Low-traffic regional branch railways
  • Station sidings, marshalling auxiliary tracks
  • Factory dedicated lines, port auxiliary transport tracks
  • Small and medium mine internal transport railways
  • Temporary railway lines and low-budget track renovation projects in CIS and Central Asia