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      Hot Dip Galvannealed Steel

      ZINCGRIP? GA Steel, is continuously coated on both sides with a zinc-iron alloy. Galvannealed steel is a specialized variation of galvanized steels where induction heating is used to alloy the zinc coating with the steel to create a zinc-iron coating. The hot dip process, which was pioneered by us, provides a tight metallurgical bond between the steel and coating. This process results in a material with the strength and formability of steel plus the corrosion protection of the zinc-iron coating. Zinc protects the base metal by providing a barrier to corrosive elements and also by the sacrificial nature of the coating. ZINCGRIP GA Steel is available with special surface finishes, tailored for specific applications, and in a variety of base metal grades and coating weights. ZINCGRIP GA Steel is widely used in many applications in automotive and general manufacturing.

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      Product Applications

      Available Grades

      Commercial Steel (CS)

      Deep Drawing Steel (DDS)

      Extra Deep Drawing Steel (EDDS, EDDS+)

      Structural Steel (SS)

      High Strength Low Alloy Steel (HSLAS)

      Dent Resistant (DR)

      Bake Hardenable (BH)

      Dual Phase (DP)

      Product Details

      Product Features


      The zinc coating protects the base metal by providing a barrier to corrosive elements and also by the sacrificial nature of the coating. Ultimate service life depends on coating thickness and the severity of the environment.


      Available as EXTRASMOOTH? or ULTRASMOOTH? for surface critical applications.


      Can be used to produce parts containing simple bends to parts with deep drawing requirements.


      Readily paintable provided proper pre-treatment is performed.


      Can be joined using a variety of accepted welding practices. Its spot weldability is improved over free zinc coatings.

      Coating Characteristics

      The hot dip coating process assures a tightly adherent, uniform coating of zinc on both sides of the product. The strip passes through an induction furnace after the coating pot to allow the iron from the base metal to further diffuse into the zinc creating a zinc-iron alloy layer. The coating is nominally 8 – 13% Fe. Precise temperature control provides sufficient ductility in the coating to permit normal fabrication practices without incurring significant coating damage or powdering. Coating designation at A40 and higher may not be suitable for higher forming applications due to the inherent attributes of the coating.

      ZINCGRIP? GA Steel has a matte gray surface with no spangle which provides a good base for painting. For best results, the surface should be carefully cleaned with an alkaline cleaner, however in some cases, cleaning by a solvent may be acceptable. Cleaning should be followed by a pre-treatment prior to painting.

      Surface Protection and Lubrication

      To prevent staining in transit and storage, ZINCGRIP? GA Steel should be coated with a protective oil. The mill can apply a mineral oil with a rust preventative combination, a pre-applied press forming lubricant, a mill-applied phosphate coating or a chemical treatment (with or without oil). A chemical treatment is not recommended if the product will be painted unless proper surface preparations are taken. Specific chemical treatment requirements (such as RoHS) must be clearly indicated and reviewed.

      Formability and Mechanical Properties


      Commercial Steel Type B (CS Type B) and Forming Steel Type B (FS Type B) should be used for moderate forming or bending applications. These products are produced from aluminum-killed continuously cast slabs and unless otherwise specified, have a carbon content of 0.02 – 0.15%C and 0.02 – 0.10%C respectively. To prevent the occurrence of fluting or stretcher strains during forming or processing, both products must be ordered as EXTRASMOOTH. These products are subject to aging and the temper rolling effect is temporary.


      For more stringent forming applications, Deep Drawing Steel, should be ordered. Deep Drawing Steel has a controlled carbon content less than 0.06%C and is produced in such a manner that parts formed from DDS should not exhibit stretcher strain.


      Extra Deep Drawing Steel or Extra Deep Drawing Steel Plus (EDDS+) should be ordered for the most difficult forming applications. These steels, also known as Interstitial Free (I-F) steel, are produced from vacuum degassed stabilized grades with less than 0.010%C. EDDS+ has the lowest carbon content available and has been specially formulated to be our most ductile product.

      For high strength applications, ZINCGRIP? GA Steel is available as STRUCTURAL STEEL (SS) or HIGH STRENGTH LOW ALLOY STEEL (HSLAS). BAKE HARDENABLE (BH), DENT RESISTANT (DR), and DUAL PHASE (DP) Steels are also available.

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