Premium R350HT P65 Heat-Treated Steel Rail

Rail & Fittings, Steel Rail

Premium R350HT P65 Heat-Treated Steel Rail

The R350HT (P65) rail is a premium-grade, heat-treated steel rail engineer for the most demanding railway applications worldwide. Its designation provides key information about its properties: “R” for rail, “350” for a minimum tensile strength of 350 kgf/mm² (approximately 1100 MPa), “HT” indicating it is Heat-Treat, and “P65” signifying it is a 65 kg/m (kilograms per meter) section rail. This combination of high strength and heavy section makes it a cornerstone of modern heavy-haul and high-speed infrastructure.

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Product Detail

Chemical Component

Drawing and Size Tolerance

Table 1: Tolerances for the allowable deviations in the cross-sectional dimensions of P65 rails

Cross-section	Data Value (mm)	Tolerance (mm)
Head width	75	±0.5
Base width	150	+1.0,-1.5
Web thickness	18	+1.0,-0.5
Rail height	180	±0.8
Track base thickness point height	11.2	+1.0,-0.5
Web height	105	±0.6
Deviation of tread shape from nominal shape	/	±0.6
Foot convexity (uniform)	/	0.5
Foot convexity	1	Not allowed
Profile deviation from symmetry (asymmetry) Symmetry(asymmetry)	1	±1.3
Single rail length (mm)	25000	±20
Note: Surface quality parameters (including straightness and distortion) shall comply with Grade B requirements specified in EN 13674-1:2011+A1:2017.

Chemistry Component(EN 13674-1:2011+A1:2017)

Table 2 Chemical composition (liquid chemical composition) Unit%

Grade	C	Si	Mn	P	S	Cr	Al	V
R350HT	0.72~0.80	0.15~0.58	0.70~1.20	≤0.020	≤0.025	≤0.15	≤0.004	≤0.03

Table 2: Upper limits for residual elements Unit%

Mo	Ni	Cu	Sn	Sb	Ti	Nb	Cu+10Sn	Cr+Mo+Ni+Cu+ V
0.02	0.10	0.15	0.030	0.020	0.025	0.04	0.35	0.25

Mechanical Properties (EN 13674-1:2011+A1:2017)

Table 3: Mechanical Properties of Rail Steel

Steel grade	Tensile strength rm/mpa	Elongation A1%	Hardness/HBW of centerline of rail head tread	Hardness of rail head cross section /HBW
R350HT	≥1180	≥9	350~390	1	2	3	4
				≥340	≥331	≥321	≥340
Note：Ultrasonic flaw detection was performed on the entire length of the rails in accordance with the EN 13674-1:2011+A1:2017 standard.

Other Notable Features

Strength and Durability: P65 rails are made from high-quality steel, making them robust and capable of withstanding heavy loads and constant train traffic.Weight: The P65 designation indicates a rail weight of 64.88 kg/m.Application: Suitable for a variety of railway lines, including mainline tracks and high-speed rail, offering stability and smoothness for train operations.Fatigue Resistance: P65 rails are known for their excellent resistance to fatigue.Installation: P65 rails are generally installed on concrete or wooden sleepers, providing a firm foundation for the track.Global Use: P65 rails are used both domestically and exported for railway infrastructure projects in various countries.