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ASTM A653 Galvanized Steel Sheet Zinc-Iron Alloy Mechanical Strength

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ASTM A653 Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM A653 specify for hot-dip zinc-coated (galvanized) or zinc-iron alloy-coated (galvannealed) steel sheet (coils and cut lengths), which defines complete test requirements, methods, mainly for tension, bending (Coating Adhesion Test),  and acceptance criteria to verify the quality, mechanical performance, coating properties, and chemical composition of coated steel sheets. 

It covers a range of steel sheet types including zinc-coated (galvanized) or zinc-iron alloy-coated (galvannealed) by the hot-dip process in coils and cut lengths. Structural steel, high strength low alloy steel, solution hardened steel, and bake hardenable steel are available in several grades based on mechanical properties. Yield strength, elongation, and bending properties of the steel shall be determined. A bend test shall be done to the coated sheets.

ASTM A653 Galvanized Steel Sheet Zinc-Iron Alloy Mechanical Strength


Test stipulated in the ASTM A653 details introduction: 

1, Mechanical Property Tests

(Tension, Bend, r-value, n-value)

Determine the structural integrity, ductility, and formability of the steel substrate.

Test Methods

Tension Test, Bend Test, Plastic Strain Ratio (r-value), and Tensile Strain-Hardening Exponent (n-value).

Test stipulation

The base metal must conform to the mechanical property requirements (Yield Strength, Tensile Strength, Elongation) based on its designation.

Test Sample Information

Tension test specimens are typically full-thickness, machined parallel to the rolling direction (longitudinal).

For r and n values, specific specimen geometries and strain measurement devices are required. 

Test EquipmentUniversal testing machine (UTM)Electronic Universal Testing Machine

Extensometer (ASTM E83); 

For r-value testing, a transverse strain measuring device is also needed.

Test Procedure

Test specimens must be prepared and tested strictly in accordance with ASTM A370.

r-value testing follows ASTM E517, and n-value testing follows ASTM E646.

2. Coating Adhesion Test 

(Bend Test for Coating)   

Evaluates the bond strength between the zinc coating and the steel substrate.
Test Method

180° bend to evaluate coating flaking. As per ASTM A1122.

ASTM A653 Galvanized Steel Sheet Zinc-Iron Alloy Mechanical Strength

Test stipulation

The coating must not flake or peel off excessively when the sheet is subjected to a specified bend.

Test Sample InformationStrip specimens of a defined width and length.
Test Equipment

Universal testing machine (UTM)Electronic Universal Testing Machine with bending test fixtures; 

Bend test machine. 

Test Procedure

Perform 180° bend; inspect for flaking on the outer bend surface.

Other test: Chemical Composition Analysis. Dimensional Inspections (Thickness, Width, Flatness). Coating Weight [Mass] Test


ASTM A653 Main Application Fields: 

ASTM A653 galvanized steel sheet is widely used in:


Automotive: Body panels, inner fenders, structural components (BHS, HSLAS grades).

Construction: Roofing, cladding, framing, gutters (corrosion resistance).

Home appliances: Refrigerators, washers, ovens (paintability, smooth finish).

Containers & storage: Steel drums, tanks (CS/FS grades).

General engineering: Brackets, ducts, pipes (structural steel SS grades).


Why ASTM A653 Tests Are Critical for the Steel sheet? 


Corrosion resistance: Coating weight/mass tests ensure sufficient zinc layer; service life is linearly proportional to coating mass.

Coating integrity: Bend test prevents flaking during forming/handling, maintaining protective performance.

Formability & strength: Mechanical/BHI tests confirm suitability for stamping, bending, and structural use.

Quality consistency: Chemical analysis avoids defects from off-composition base metal or zinc bath.

Industry compliance: Meets requirements for automotive, construction, and appliance sectors, ensuring fitness for service.

Process control: Guides production adjustment for coating uniformity and material stability.

Related products and device

ASTM A653 Galvanized Steel Sheet Tensile, Bending Universal Testing Machine

United Test make Universal Testing Machines are known for their long lasting trouble-free performance and highest quality material used in the manufacturing process. The Hydraulic universal testing machine can perform tension, compression, flexure/bending and shearing test for kinds of specimens. Suitable for metal and nonmetal material, such as iron, steel, steel bar, rebar, cement, concrete, rod and so on. Specially design for production, research, student training and industrial laboratory. Available in wide range of loadframe capacities (300kN to 2000kN)/(10Ton to 200Ton) and with combination of control panels (Digital, Computerized) makes United Test product range suitable for every customer requirement.

ASTM A653 Galvanized Steel Sheet tensile testing machine

WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

ASTM A653 Galvanized Steel Sheet Bending Testing Machine

Metal Bending & Rebending Testing Machine is used for bending tests of metal materials such as rods, sheets and rebar for construction, and is loaded with two-way hydraulic cylinders, adjusting the roll spacing by hand wheels and being able to lock itself.

ASTM A653 Galvanized Steel Sheet Bending test fixture for UTM

Metal bending test fixture used measure the ductility of metallic materials, bent the test specimen to a predetermined angle or until the specimen fractures. Conform with ASTM E290, ISO 7438, and JIS Z2248 standard.

Related Standard

ASTM A370 Test method for mechanical testing of steel

ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products


ASTM A370 test methods cover procedures and definitions for the mechanical testing of steels, stainless steels, and related alloys. The various mechanical tests herein described are used to determine properties required in the product specifications. Variations in testing methods are to be avoided, and standard methods of testing are to be followed to obtain reproducible and comparable results. In those cases in which the testing requirements for certain products are unique or at variance with these general procedures, the product specification testing requirements shall control.


Covering tests like Tension, Bend, Hardness, Brinell, Rockwell, Portable, and Impact, each catering to distinct aspects of mechanical property assessment. Moreover, it accommodates annexes for specific product types, including Bar Products, Tubular Products, Fasteners, Round Wire Products, and more, ensuring a holistic approach to testing.


ASTM E290 Metal Bend testing of materials ductility

ASTM E290 Standard Test Methods for Bend Testing of Material for Ductility


ASTM E290 is a destructive mechanical test standard that evaluates the ductility and structural soundness of metallic materials (and welds) by subjecting specimens to controlled bending deformationASTM International. It is a widely used quality control and qualification method for metals, alloys, and welded joints across industries.

ISO 7438 Metallic materials Bending test details

ISO 7438 is a standard that specifies a method for determining the ability of metallic materials to undergo plastic deformation in bending. It is used to evaluate the flexural strength and stiffness of a material , The bend test shall be carried out in testing machines equipped with a bending device with two supports and a former; bending device with a V-block and a former; bending device with a clamp. 

ISO 6892-1 Metallic materials - Tensile testing

ISO 6892 specifies the method for tensile testing of metallic materials and defines the mechanical properties which can be determined at room temperature.  Related standard ASTM E8 , JIS Z2241 Method of tensile test for metallic materials.

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