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This is a Russian stainless steel, designated as ЭИ-107 (EI-107) in Cyrillic, with H10S2M being its Polish equivalent. It is a material of choice for the Zlatoust Rosoruzhie company from the Ural Mountains, which uses it alongside the 100X13M steel. In terms of performance, these are high-grade stainless steels that match and even slightly surpass the hardness of the top-tier 440B and 440C steel grades.