A871-65 is an HSLA structural steel plate with improved atmospheric corrosion resistance that’s also known as a weathering steel.

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Typical Standards

FormatGrade Sizes Routinely Stocked (Imperial units)
Thickness WidthLength
Coil653/16" - 1/2" 48", 60", 72", 84", 96"Any
Cut to Length653/16" - 1/2"84", 96"Any
Hot Rolled (Strip Mill)653/16" - 1/2"48", 60", 72"Any
Discrete (Mill Rolled)653/16" - 3"72", 84", 96", 120"240" - 480"

General Info About A871

A871 weathering steel comes in 2 different grades including grades 60 and 65. To meet mechanical requirements, 871 steel plate can be provided in the as-rolled, normalized, or quenched and tempered conditions.

More Details About A871

  • Advantages/Disadvantages

    When properly designed, it can be used bare, without paint, for many applications. It has very good corrosion resistance comes at a higher price point than other steel plates. As a microalloyed steel, its fine grain structure contributes to high durability.

  • Applications

    It is used in tubular structures and poles where the atmospheric corrosion resistance is a must. Some examples are:

    • lighting poles
    • signposts
    • transmission poles
  • Machining

    This grade can be machined in the annealed condition, but will have better results when the condition is H1150M.

  • Welding

    Yes, this grade can be welded by common fusion and resistance methods, but should not be joined by oxyacetulene welding.

  • Heat Treatment

    It is heat-treatable.

Chemical Properties

0.17 - 0.20%0.5 - 1.35%0.03%0.03%0.15 - 0.65%0.4 - 0.5%0.4 - 0.7%0 - 0.1%0.20 - 0.50%0.01 - 0.1% 0 - 0.05%

Mechanical Properties

Mechanical Properties
Tensile Strength, Ultimate450 MPa65,000 PSI
Tensile Strength, Yield550 MPa80,000 PSI
Elongation at Break (in 200 mm)15%15%
Elongation at Break (in 50 mm)17%17%

Frequently Asked Questions About A871

  • What is the A871 Grade 60 ultimate strength?


    A871 Grade 60 has an ultimate tensile strength of 75,000 PSI and a yield strength of 60,000 PSI.

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