A633 is high-strength low alloy structural steel plate with high notch toughness. Kloeckner Metals routinely stocks A633 nationwide.

Download Spec Sheet

Typical Standards

Dimensions (Imperial Units)
3/8" - 4"48" - 120"96" - 480"

General Info About A633

It is suited for applications where temperatures drop to up to -50 °F and high notch toughness is a requirement.

More Details About A633

  • Advantages/Disadvantages

    This steel grade has strong notch toughness, high strength, and is suitable for low temperatures.

  • Industries

    Some common industries for this grade are the marine, chemical, power, and boiler industries.

  • Applications

    Heat exchangers, spherical tanks, oil and gas tanks, boiler drums, and separators are common applications for this steel.

  • Machining

    A633 can be machined in the annealed condition, however condition H1150M will provide the best result.

  • Welding

    A633 is excellent for welding.

  • Heat Treatment

    A633 is heat treatable.

Chemical Properties

0.19% Max0.80 - 1.25%0.030% Max0.030% Max0.30 - 0.65%0.40% Max0.40 - 0.65%0.25 - 0.40%0.02 - 0.10%

Mechanical Properties

Tensile Strength485 MPa65 KSI
Yield Strength345 MPa50 KSI
Elongation 200mm/8"1818
Elongation 50mm/2"2121

Frequently Asked Questions

  • What is the yield strength of A633?

    The yield strength, or the point at which this steel grade will show permanent deformation, is at 345 MPa, or 50,000 psi.

  • What grades does this steel come in?

    This steel is available in four grades: A, C, D, and E. The differ slightly in their mechanical properties. For example, in their minimum yield points. Grade A has a minimum yield point of 290 MPa / 40 ksi, versus grade C and D at 345 Mpa / 50 ksi. Mechanical properties, such as yield point, will also vary depending on the thickness of the steel product. Of all four grades, grade E is available in the greatest thickness.

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