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Track Shoe Steel

Overview

Track shoe steel is a specialized material designed for the manufacturing of track shoes used in heavy machinery such as bulldozers, loaders, and excavators. This high-strength steel is engineered to withstand the extreme conditions of construction, mining, and agricultural applications. The primary grades of track shoe steel include 40Mn2, 35MnBH, and 35MnBM, each selected for its specific mechanical properties.

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Characteristics

High Yield Strength:Track shoe steel offers exceptional yield strength, ensuring the material can handle heavy loads without permanent deformation. For instance, 40Mn2 steel typically exhibits a yield strength of around 400 MPa, providing the necessary robustness for demanding environments.
Excellent Wear Resistance:This steel is highly resistant to wear, which is critical for maintaining the longevity of track shoes in abrasive conditions. Wear resistance is often quantified by the steel’s hardness, with grades like 35MnBH and 35MnBM achieving Rockwell hardness values in the range of HRC 45-50 after appropriate heat treatment.
Good Impact Toughness:Track shoe steel demonstrates good impact toughness, meaning it can absorb energy and resist fracturing under sudden impacts. This is essential for operations involving heavy and dynamic loads.
Cold Formability:The steel can be cold-formed into various shapes without cracking, allowing for the production of complex components such as track plates and links.
Superior Weldability:Excellent weldability ensures that track shoe components can be easily joined during manufacturing and repair, reducing downtime and maintenance costs.

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Production Process

Steelmaking:The production of track shoe steel begins with melting high-quality raw materials in a blast furnace or electric arc furnace.
Alloying:Specific alloying elements, such as manganese and boron, are added to the molten steel to enhance its mechanical properties. For instance, 35MnBM includes boron to improve hardenability.
Hot Rolling:The molten steel is cast into slabs and then hot-rolled into plates or strips through a series of rolling processes to achieve the desired thickness and width.
Heat Treatment:The steel undergoes heat treatments such as quenching and tempering to attain the necessary hardness and toughness. For example, 40Mn2 steel is often quenched and tempered to achieve a balanced combination of strength and toughness.
Surface Treatment:The surface of the steel is treated to enhance corrosion resistance, typically through processes like shot blasting and applying anti-corrosive coatings.

Applications

Construction Machinery:Track shoe steel is crucial for manufacturing track shoes and links for bulldozers, loaders, and excavators. For example, an excavator operating in a quarry relies on the high strength and wear resistance of track shoe steel to navigate rough terrains without frequent replacements.
Mining Equipment:In the mining industry, track shoe steel is used in track loaders and dozers that work in highly abrasive conditions. The durability and wear resistance of the steel ensure these machines can operate efficiently and with minimal downtime.
Agricultural Machinery:Track shoe steel is also used in tractors and harvesters, where its strength and toughness help the machines perform reliably across various soil conditions.

Common Sizes

Bar:

Diameter: φ50-100mm

Length 4-12m

Chemical Composition

Track shoe steel typically includes high carbon content along with alloying elements such as manganese, chromium, and boron to enhance its properties.

For example, 40Mn2 contains around 0.4% carbon and 1.2-1.6% manganese, while 35MnBH and 35MnBM include boron for improved hardenability.

Product Category	Steel Type	Representative Grade	Execution Standard
Track Shoe Steel	Mn	40Mn2	Agreement
Track Shoe Steel	MnB	35MnBH, 35MnBM	Agreement

Comparison Table of Steel Grades by Country

Track Shoe Steel
GB	ISO	AISI	JS	BS
40Mn2	42Mn6	1340	SMn438	150M36
35MnB	IE0669

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