Alloy Grade UNS: SC 4340 – General Structural Use

  • Overview

    J24053, also known as SC 4340, is a versatile alloy steel designed for general structural applications where high strength and wear resistance are essential. This alloy exhibits excellent tensile strength, particularly after heat treatment, making it capable of withstanding significant loads and stresses. Its high abrasion resistance ensures durability and long-term performance in applications involving friction and wear. Furthermore, J24053 offers good weldability, castability, and machinability, providing flexibility in fabrication and design. This combination of strength, wear resistance, and ease of manufacturing makes J24053 a valuable choice for a variety of structural applications, including those in demanding environments where components must withstand heavy loads and resist wear and tear.

  • Typical Uses

    Cylinders, marine propulsion, rolls, and shaft sleeves.

  • MetalTek Designation

    MTEK 4340

  • Poured At:

    Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Cast UNS: J24053

Wrought UNS: G43400

Wrought Grade: AISI 4340

Cast Grade: SC 4340

Cast ASTM: A915, A732

Military/AMS: AMS 5331

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.4

Chromium: 0.8

Manganese: 1 MAX

Iron: BAL

Copper: n/a

Nickel: 1.8

Lead: n/a

Tin: n/a

Silicon: 0.60 MAX

Zinc: n/a

Other: Mo 0.30

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

Heat Treatment: Normalize

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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Non-ferrous alloys are, literally, materials that are not iron-based. While others may provide non-ferrous materials of other materials, the MetalTek family of non-ferrous alloys are copper-based. In general, these materials deliver high strength, and excellent wear and corrosion resistance. They are often found in marine applications and also bushing, bearing, and gear environments.
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Stainless steels owe their ability to resist corrosion primarily to the presence of a passive film on their surface. Chromium is chiefly responsible for formation of the passive film. Iron ceases to rust at approximately 12% chromium content and resistance to oxidizing corrosives increases rapidly with chromium content up to approximately 20%.
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Specialty Alloys comprise a broad group of materials that deliver properties for more demanding applications, use more exotic or expensive materials, or require special processes to manufacture. Where standard materials may not offer desired performance, specialty alloys (including those that are modified further) may be a sensible selection.