Alloy Grade UNS: HY-80 – NAVSEA Technical Publication T9074

  • Overview

    HY-80 is a high-strength, low-alloy steel commonly used in Naval applications, particularly for the construction of submarines and other military vessels. With high yield strength, it offers excellent structural integrity under the extreme pressures encountered at depth. The alloy provides a balance of strength, toughness, and resistance to corrosion, crucial for submarines operating in harsh marine environments. HY-80 also demonstrates good weldability, allowing for efficient assembly of complex structures without compromising its mechanical properties. Its toughness, particularly at low temperatures, further enhances its suitability for underwater applications where resistance to brittle fracture is essential. Overall, HY-80 is a vital material for ensuring the durability, safety, and performance of naval vessels.

  • Typical Uses

    HY-80 is suited for the Naval defense market, including both submarines and surface ships.

  • MetalTek Designation

    HY-80

  • Poured At:

    Carondelet Division

Similar Specifications

Wrought Grade: HSLA-80

Military/AMS: T9074-BD-GIB-010/0300

Typical Chemical Composition (% by wt.)

Aluminum: 0.04 MAX

Carbon: 0.2 MAX

Chromium: 1.35-1.65

Manganese: 0.55-0.75

Iron: BAL

Copper: 0.25 MAX

Nickel: 2.75-3.25

Lead: n/a

Tin: n/a

Silicon: 0.5 MAX

Zinc: n/a

Other: Mo 0.3-0.6

Minimum Mechanical Properties

Brinell Typical:

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

Heat Treatment: Quench And Temper

Frequently Asked Questions

Alloy steels are steels alloyed with elements such as chromium, nickel, molybdenum, or vanadium to improve mechanical properties and performance.

Alloy steels are used in aerospace structures, pressure vessels, pipelines, tools, and machinery requiring high strength and toughness.

Alloy steel differs from carbon steel by the addition of alloying elements like chromium, nickel, and molybdenum to improve mechanical properties and corrosion resistance.

Types include low-alloy steel (up to 8% alloying elements) and high-alloy steel (above 8%), tailored for strength, wear resistance, or toughness.

Commonly added elements include chromium, nickel, molybdenum, vanadium, manganese, silicon, and boron to enhance strength, hardness, and corrosion resistance.

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