Alloy Grade UNS: SC 4140 – General Structural Use

  • Overview

    SC 4140 alloy steel is excellent for marine applications along with general structural uses. It is much stronger than standard steel and has good toughness and tensile strength. Alloy 4140 steel contains carbon, chromium, silicon, and manganese.

  • Typical Uses

    Cylinders, marine propulsion, rolls, and shaft sleeves.

  • MetalTek Grade

    MTEK 4140

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


Tensile, MPa


Yield, ksi


Yield, MPa




Heat Treatment: Normalize, Quench And Temper