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We have 3 other definitions for HY
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We start with steel that has mill-certified metallurgical properties specifically formulated for the process to insure a weld of maximum strength and a steel that can be quenched and tempered to a very high yield strength.
The atoms of these elements are of different sizes, so they don't readily form crystals, even when cooled slowly One aspect of this alloy is its very high yield strength, which approaches the theoretical limit and far exceeds the strength currently available in crystalline metals and alloys.
All models boast a reinforced structure with built-in crumple zones, high yield strength cross-beams and steel rollover protection.