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IS 16733:2018 is the Indian Standard (BIS) for hot rolled steel rails for railway tracks - specification. This standard specifies the requirements for hot-rolled steel rails used in railway tracks. It covers manufacturing, chemical composition, mechanical properties, geometric dimensions, testing procedures, and classification for various grades of rails.
Specifies requirements for hot rolled steel rails of various grades used in railway tracks, representing modern standards.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! This single standard harmonizes and replaces six previous IS codes for different types of rails, simplifying procurement and specification.
! Pay close attention to the rail class ('A' or 'B') as Class 'A' has much stricter controls on hydrogen content and internal defects, intended for high-speed or heavy-haul routes.
! The grade designation (e.g., R 260) directly corresponds to the minimum specified Brinell hardness (BHN), making identification easier.
EN 13674-1:2011+A1:2017CEN (European Committee for Standardization), Europe
HighCurrent
Railway applications - Track - Rail - Part 1: Vignole railway rails 46 kg/m and above
Specifies requirements for hot-rolled Vignole (flat-bottom) rails for conventional and high-speed railway tracks.
AREMA MRE, Chapter 4AREMA (American Railway Engineering and Maintenance-of-Way Association), USA
HighCurrent
Manual for Railway Engineering, Chapter 4, Rail
Provides specifications, manufacturing practices, and recommended guidelines for steel rails used in North American railways.
UIC 860 V:2008UIC (International Union of Railways), International
HighCurrent
Technical specification for the supply of rails
Defines the quality requirements and testing conditions for Vignole rails supplied to UIC member railways.
GOST R 51685-2013Rosstandart (Federal Agency on Technical Regulating and Metrology), Russia
HighCurrent
Railway rails. General specifications
Covers general technical specifications for hot-rolled, non-heat-treated and heat-treated railway rails.
Key Differences
≠Hydrogen content in liquid steel is limited to ≤ 2.0 ppm in IS 16733, whereas EN 13674-1 imposes a stricter limit, typically ≤ 1.8 ppm, and even lower for premium grades (e.g., ≤ 1.3 ppm for R350HT).
≠IS 16733 uses its own methods (Method A/B) and limits for micro-inclusion cleanliness, which differ from the more detailed and stringent Method K specified in EN 13674-1, a common international benchmark.
≠IS 16733 specifies tighter maximum limits for phosphorus (≤ 0.030%) and sulphur (≤ 0.025%) compared to the most stringent grades in EN 13674-1, which often require P ≤ 0.020% and S ≤ 0.020%.
≠While both standards define dimensional tolerances, EN 13674-1 provides distinct tolerance classes for straightness (e.g., Class X for high-speed and Class Y for standard lines) which are more stringent than the standard 'Class A' in IS 16733.
Key Similarities
≈All standards mandate that rails be manufactured via a Basic Oxygen Furnace (BOF) or Electric Arc Furnace (EAF) process, from continuously cast blooms, and include vacuum degassing to control gas content.
≈The fundamental set of qualification and acceptance tests is similar, including tensile tests, hardness testing on the rail head, impact/drop weight tests, and macro-etching for internal structure examination.
≈Major rail profiles, such as the 60E1 (formerly UIC60), are common across standards, ensuring a high degree of dimensional interoperability for key track components.
≈All standards include provisions for head-hardened (HH) rails (e.g., Grade HH 350 in IS 16733, R350HT in EN 13674-1) to provide enhanced wear resistance and extended service life for heavy haul or high traffic lines.
Parameter Comparison
Parameter
IS Value
International
Source
Tensile Strength (Standard Grade)
Min 880 MPa (for Grade 880)
880 - 1030 MPa (for Grade R260)
EN 13674-1
Hardness (Head Hardened Grade)
340 - 380 HBW (for Grade HH 350)
350 - 390 HBW (for Grade R350HT)
EN 13674-1
Hydrogen Content (in liquid steel)
≤ 2.0 ppm
≤ 1.8 ppm (for standard grades)
EN 13674-1
Sulphur (S) Content
≤ 0.025%
≤ 0.020%
EN 13674-1
Phosphorus (P) Content
≤ 0.030%
≤ 0.020%
EN 13674-1
Straightness Deviation (Vertical, 1.5m wave)
≤ 0.7 mm (for Class 'A' rail)
≤ 0.3 mm (for Class 'X' high-performance rail)
EN 13674-1
Elongation (Standard Grade)
Min 10% (for Grade 880)
Min 10% (for Grade R260)
EN 13674-1
⚠ Verify details from original standards before use
What are the main grades of rails specified in IS 16733?+
The main grades are R 260, 880, 1080 Cr, and Head Hardened grades like R 350 HT. (Clause 4)
What are the standard lengths for rails?+
Standard lengths are 13 m and 26 m. They can also be supplied as long welded rails (LWR) up to 260 m. (Clause 11.6)
What is the minimum hardness for a Grade R 260 rail?+
The hardness must be between 260 and 300 BHN. (Table 3)
What is the difference between Class 'A' and Class 'B' rails?+
Class 'A' rails have stricter controls on hydrogen content (<1.6 ppm) and ultrasonic testing acceptance criteria, making them suitable for more demanding applications. (Clause 5.4.1 & 13.5)