High mechanical strength and high thermal conductivity vermicular cast iron alloy, high mechanical strength and high thermal conductivity vermicular cast iron alloy manufacturing process, and internal combustion engine part

EP4555117A4Pending Publication Date: 2026-07-08TUPY SA
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
TUPY SA
Filing Date
2022-07-12
Publication Date
2026-07-08

AI Technical Summary

Technical Problem

Conventional vermicular cast irons face a trade-off between mechanical strength and thermal conductivity, with existing solutions failing to simultaneously achieve high levels of both properties, which is critical for advanced internal combustion engine applications.

Method used

A vermicular cast iron alloy with a specific composition including controlled amounts of elements like silicon, magnesium, rare earths, and inoculants, along with precise control of residual elements, is developed to achieve high mechanical strength and thermal conductivity, combined with a manufacturing process that ensures precise chemical composition and microstructure optimization.

Benefits of technology

The alloy achieves a minimum of 450 MPa tensile strength, 320 MPa yield strength, and 39 W/mK thermal conductivity at ambient temperature, with comparable performance at elevated temperatures, while maintaining superior machinability and eliminating the need for post-solidification heat treatments.

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Abstract

This invention relates to a vermicular cast iron alloy with high mechanical strength and thermal conductivity requirements to replace the conventional gray and vermicular cast irons and introduces a manufacturing process for high mechanical strength and thermal conductivity vermicular cast iron alloy and internal combustion engine parts produced from said alloy. The alloy includes carbon, manganese, tin, copper, molybdenum, silicon, magnesium, rare earths, chromium, titanium, niobium, vanadium, tungsten, phosphorus, sulfur, aluminum, and nickel. The alloy has a graphite microstructure consisting of up to 70% of vermicular particles and up to 30% of nodular particles in area, with a matrix in area up to 80% pearlitic and up to 20% ferritic, with presence of segregating carbides of up to 1%.
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