This standard outlines the dimensional parameters, allowable deviations, and material specifications for hot-rolled track shoe sections, specifically the TS-L1 profile, used in railway track structures. It details chemical makeup, mechanical characteristics, rolling tolerances, and surface finish requirements to ensure uniform production quality. The document serves as a vital reference for professionals involved in manufacturing and quality assurance of railway track components.
Overview
This standard outlines the dimensional parameters, allowable deviations, and material specifications for hot-rolled track shoe sections, specifically the TS-L1 profile, used in railway track structures. It details chemical makeup, mechanical characteristics, rolling tolerances, and surface finish requirements to ensure uniform production quality. The document serves as a vital reference for professionals involved in manufacturing and quality assurance of railway track components.
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Frequently Asked
The standard recommends, though does not mandate, chemical composition ranges for hot-rolled steel used in TS-L1 track shoe sections as outlined in Appendix A. Typical compositions include Carbon between 0.20% and 0.25%, Manganese from 0.50% to 0.80%, Silicon ranging 0.15% to 0.35%, and maximum allowable Sulfur and Phosphorus contents of 0.05%. These values are intended as guidelines subject to purchaser-supplier agreement to ensure the steel exhibits adequate strength, toughness, and wear resistance.
According to the standard, rolling tolerances include strict flatness limits where convexity is prohibited, and concavity up to 0.5 mm is allowed along any straight edge on the link face. Additionally, the mass per unit length must adhere to a tolerance of plus 2.5%. These specifications ensure dimensional accuracy and consistent material quality during manufacturing, with measurement methods defined per the standard's figures.
The code prohibits laps and seams within the critical grouser fillet regions (radii R6 and R7), while permitting a maximum defect depth of 1 mm on other areas like the sides, plate, toe, and heel edges. Hairline cracks are not allowed in the grouser fillet but may be accepted up to 1 mm depth elsewhere provided they can be removed by grinding. Other defects such as linear scars are similarly restricted in critical areas and allowed with limits elsewhere. Overall, defects must not compromise the final heat-treated product's performance, and their acceptance is subject to agreement between buyer and supplier.
Post heat treatment, the steel must meet a minimum impact energy of 29 Joules at room temperature. The heat treatment process involves austenitizing the hot-rolled sections, followed by water quenching, and then tempering in a furnace at 400°C for two hours. This treatment achieves the necessary balance of hardness and toughness essential for the durability and performance of track shoe components.
The permissible sweep refers to the maximum allowable deviation from a straight line along the length of the track shoe section. It is quantified by measuring the greatest deviation (in millimeters) over a specified length of 3 meters. The standard permits a maximum sweep of 6 mm within this length to guarantee proper fit and function, preventing misalignment or excessive wear during service.
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