Alloy Grade UNS: SC 4140 – General Structural Use

  • Overview

    SC 4140 is a high-strength low-alloy steel renowned for its exceptional combination of strength, toughness, and fatigue resistance. This alloy steel significantly surpasses standard steel in strength, making it suitable for demanding applications where structural integrity is paramount. Its excellent toughness allows it to absorb impact energy and resist fracture, while its high tensile strength enables it to withstand significant loads. Furthermore, SC 4140 exhibits exceptional fatigue strength, resisting cracking and failure under cyclic loading conditions. Its good ductility allows for forming, although it requires greater force due to its increased strength. This combination of properties makes SC 4140 a valuable choice for applications requiring a balance of strength, toughness, and fatigue resistance, particularly in demanding environments.

  • Typical Uses

    Cylinders, marine propulsion, pump and valves, rolls, agricultural and defense applications and shaft sleeves.

  • MetalTek Designation

    MTEK 4140

  • Poured At:

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

Similar Specifications

Cast UNS: J14045

Wrought UNS: G41400

Wrought Grade: AISI 4140

Cast Grade: SC 4140

Cast ASTM: A915, A732

Military/AMS: AMS 5338

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.4

Chromium: 0.9

Manganese: 1

Iron: BAL

Copper: n/a

Nickel: n/a

Lead: n/a

Tin: n/a

Silicon: 0.5

Zinc: n/a

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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