Ultra-High-Carbon Steel
Ultra-high-carbon steels occupy a specialized region above conventional high-carbon grades and are used when extreme hardness, fine carbide structures or specialist edge/wear performance is required.
Composition & metallurgy
Often described in literature as roughly 1.0–2.1% carbon, though commercial classification varies and cast irons begin beyond the practical steel range depending on composition and processing.
Common grades and standards
Specialty high-carbon tool, strip and wire compositions rather than one universal grade list. Historical crucible and modern experimental ultrahigh-carbon steels also fall in this family.
Typical applications
Specialty knives and blades, high-wear components, fine wire, research materials and niche tooling.
Engineering characteristics
Potential for very high hardness and wear resistance, but processing is demanding. Carbide control, forging temperature, heat treatment and fracture toughness are key concerns.
Known manufacturers and producer regions
Production is concentrated among specialty steelmakers rather than commodity mills. Examples include specialist operations associated with Daido Steel (Japan), Ovako (Europe), voestalpine/Böhler (Austria) and other tool- and specialty-steel producers.
Selection checklist
Confirm product form, design code, strength level, toughness/impact requirement, service temperature, corrosion exposure, weldability, forming route, heat-treatment condition, dimensional tolerance, inspection level and mill certification. Do not substitute a “similar” grade solely from a cross-reference table without checking the governing specification.
Element Folio engineering reference. Grade ranges are typical and may vary by standard. Verify the latest ASTM/ASME, EN, JIS, API or other governing specification and the mill’s current product data before procurement.
