550AT - CSA G40.21-2013

Grade	550AT
Corresponding Standard	CSA G40.21-2013 Structural Quality Steel
Classification	Alloy Steel

550AT Chemical Element Composition Content (%)

	Component	C	Si ^ⓑ	Mn ^ⓖ	P	S	Cr ^ⓟ	Ni ^ⓟ	Cu ^ⓓ
①	Minimum Value	-	0.15	-	-	-	-	0.25	0.2
①	Maximum Value	0.15	0.4	1.75	0.025	0.035	0.7	0.5	0.6

	Component	C	Si ^ⓑ	Mn ^*	P	S	Cr ^ⓟ	Ni ^ⓟ	Cu ^ⓓ
②	Minimum Value	-	0.15	-	-	-	-	-	0.2
②	Maximum Value	0.15	0.4	1.85	0.03	0.03	0.7	0.9	0.6

550AT Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
t≤65①	620~860	≥550	L0=200mm: long.: ≥13 tr.: ≥10 L0=50mm: long.: ≥15 tr.: ≥12
Hollow section	620~860	≥550	L0=50mm: ≥15

550AT Corresponding Standards(Same grade name, different standards)

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