H10 -- low-V hot work die steel. Better thermal shock resistance than H13. For aluminium extrusion dies and hot forging dies subject to severe cyclic thermal shock where H13 cracks from fatigue.
X32CrMoV3-3 (EN 1.2365 / AISI H10) per EN ISO 4957. Lower V (0.5%) than H13 (1.0%) gives better toughness and thermal shock resistance -- critical for aluminium extrusion dies that see rapid heating-cooling cycles. Standard for Al extrusion dies, die-casting ejector pins under thermal cycling and heavy forging punch.
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