Lead hardening
The steel is hardened through a special process using a bath of molten lead where the forged steel blade is immersed at 800 °C (degrees Celsius).[1] The efficient metal-to-metal heat transfer, from the surrounding lead to the steel blade, enables fast and uniform heating of the steel at the optimum temperature for maximum hardness. The annealing stage follows the hardening process, where at 300 °C the steel becomes flexible and brittleness is eliminated according to phase diagrams for steel.[1][6]
Thiers Issard is allowed by special exemption in French law to continue using this lead hardening process, while health concerns prohibit its use by any other manufacturer.[1]
The steel is hardened through a special process using a bath of molten lead where the forged steel blade is immersed at 800 °C (degrees Celsius).[1] The efficient metal-to-metal heat transfer, from the surrounding lead to the steel blade, enables fast and uniform heating of the steel at the optimum temperature for maximum hardness. The annealing stage follows the hardening process, where at 300 °C the steel becomes flexible and brittleness is eliminated according to phase diagrams for steel.[1][6]
Thiers Issard is allowed by special exemption in French law to continue using this lead hardening process, while health concerns prohibit its use by any other manufacturer.[1]
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