S550QL1H 1.8686 - EN 10219-3-2020

Grade	S550QL1H
European Standard Steel Grade	1.8686
Corresponding Standard	EN 10219-3-2020 Cold Formed Welded Steel Structural Hollow Sections - Part 3: Technical Delivery Conditions for High Strength and Weather Resistant Steels
Classification	Alloy Steel

S550QL1H Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N	Ti ^③	W	V ^③	Nb ^③	Zr ^③	B
Minimum Value	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Maximum Value	0.25	0.8	1.7	0.02	0.01	1.5	2	0.5	0.7	0.02	0.05	1.5	0.16	0.06	0.15	0.005

① Depending on thickness of the product and the manufacturing conditions, the manufacturer may, in order to obtain the specified properties, add one or several alloying elements up to the maximum values given.
② The deoxidation method is designated as follows: FF= fully killed steel containing nitrogen binding elements in amounts sufficient to bind the available nitrogen and having a fine grain structure.
③ There shall be at least 0,015 % of a grain-refining element present. Aluminium is one of these elements. The minimum content of 0,015 % applies to soluble aluminium, this value is regarded as attained if the total aluminium content is at least 0,018 %; in case of dispute the soluble aluminium content shall be determined.

S550QL1H Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
t≤16	640~820	ReH: ≥550	l：≥16 t：≥14
16＜t≤40	640~820	ReH: ≥530	l：≥16 t：≥14
/				l：≥35 t：≥27

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