G550 Steel

G550 steel is a structural steel grade in the Australian AS 1397 (Continuous hot-dip metallic coated steel sheet and strip) standard. G550 means that the minimum yield strength is 550MPa.

G550 steel can provide the following hot-dip coatings:

Zinc coating (Z).

Zinc coating converted to zinc/iron alloy (ZF).

Zinc/aluminium (ZA).

Zinc/aluminium/magnesium (ZM).

Aluminium/zinc (AZ)

Aluminium/zinc/magnesium (AM).

G550 Requirements for Chemical Composition

Steel grade designation
AS 1397
Chemical composition (cast analysis), % max.
CarbonManganesePhosphorusSulfur
G5500.21.20.040.03

G550 Mechanical Property Requirements

Steel grade
designation
Longitudinal tensile testTransverse bend test
Min. yield
strength
MPa
min. tensile
strength
MPa
Min.elongation,% Angle of bend degreesDiameter of mandrel in terms of test piece thickness (t)
Lo = 50 mmLo = 80 mm
G55055055022

G550 Coating Adhesion (180° bend test) requirements

Steel grade designationDiameter of mandrel in terms of thickness of product (t)
Coating class
"Z", "ZA", "ZF" and "ZM""AZ" and "AM"
Z100,
ZA90
ZF80
ZF100
Z200,
ZA135,
ZA180,
ZM90,
ZM120,
ZM150,
ZM180
Z275,
ZA225,
ZA275,
ZM220,
ZM275
Z350,
ZA350,
ZM350
Z450,
ZA450,
ZM450
Z600AZ150,
AM100,
AM125,
AM150
AZ200,
AM175,
AM200
AM225
G550t2t2t2t2t3t2t2t

G550 Steel equivalent

Standard Grade
EN 10346 S550GD
ASTM A653 SS550
JIS G 3302 SGC550

Use of G550 Steel

Roofing,
Cladding,
Roll-formed sections for structural applications

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