Materials Atlas DefMetrix

Steel · Product form

Steel Plate

Who makes or stocks plate in this alloy, and can I get it US-melted?

What it is

Flat rolled product above the thickness threshold that separates it from sheet, supplied in the mill-annealed or as-rolled condition and typically sold by the pound from a cut plate.

Typical dimensions
0.1875 inch and thicker; widths to roughly 120 inches depending on mill.
Also known as
plates, flat rolled, cut plate

Suppliers

Grouped by what they actually are. A mill and a distributor answer different needs.

Mills and producers 4

Companies that manufacture this form. Mill direct means longer lead times and mill minimums, with full melt traceability.

  • Cleveland-Cliffs Reported
    Cleveland, OH · Mill
    US melted

    Largest flat-rolled producer in North America. Armor and naval qualifications not confirmed. Melt origin recorded as US on the strength of an integrated domestic producer that describes itself as spanning iron ore mining through post-consumer recycling. The deep-dive did NOT establish individual plant locations or whether the route is blast furnace, EAF or DRI, so treat DFARS 252.225-7009 status as a per-heat question to be confirmed on the mill certificate rather than as settled by this record.

    source
  • Clifton Steel Verified
    Maple Heights, OH · Converter Distributor
    Rolled Homogeneous Armor (RHA), High Hardness Armor

    Armor plate with in-house heat treat lines to MIL-A-12560, MIL-A-46100, MIL-DTL-46186 and MIL-DTL-32332. They heat treat rather than melt, so melt source comes from the mill certification. MIL-A-12560 is the RHA specification and MIL-A-46100 the high hardness specification, so both classes are covered.

    source
  • Nucor Corporation Reported
    Charlotte, NC · Mill Recycler
    US melted

    Domestic EAF melting. No armor specification qualification was confirmed. Re-confirmed 2026-07-30 and corroborated: every Nucor mill melts recycled scrap in an electric arc furnace and continuously casts. DFARS 252.225-7009 status is still settled per heat on the mill certificate.

    source
  • Universal Stainless & Alloy Products Verified
    Bridgeville, PA · Mill
    US melted

    Specialty steel plate among the published product forms, including tool steel, bearing steel, gear steel and aircraft quality low alloy grades.

    source

Distributors and stockists 5

Companies that hold inventory for resale. Faster and available in small quantities, at a markup. Ask what mill the material came from if traceability matters.

  • Alro Steel Reported
    Jackson, MI · Distributor

    Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.

    source
  • American Alloy Steel Reported
    Houston, TX · Distributor
    HY-80 and HY-100

    HY-80 and HY-100 against MIL-S-16216 and NAVSEA Technical Publication T9074. Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.

    source
  • Chapel Steel Reported
    Spring House, PA · Distributor Service provider

    Armor plate to MIL-A-12560. Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.

    source
  • Olympic Steel Reported
    Highland Hills, OH · Distributor Service provider

    Armor plate to MIL-DTL-12560. Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.

    source
  • Ryerson Inferred
    Chicago, IL · Distributor

    Distributor stock. Establish grade and mill certification per heat rather than from the catalog listing.

    source

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