Q550D L05504 - GB /T 1591-2008

Grade	Q550D
China ISC	L05504
Corresponding Standard	GB /T 1591-2008 High Strength Low Alloy Structural Steels
Classification	Alloy Steel
Properties	High Strength

Q550D Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N	Ti	V	Nb	B	Al ^b
Minimum Value	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0.015
Maximum Value	0.18	0.6	2	0.03	0.025	0.8	0.8	0.8	0.3	0.015	0.2	0.12	0.11	0.004	-

Q550D Mechanical Properties

thickness（diameter，length of side） t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
t≤16	670~830	≥550	≥16
16<t≤40	670~830	≥530	≥16
40＜t≤63	620~810	≥520	≥16
63＜t≤80	600~790	≥500	≥16
80＜t≤100	590~780	≥490	≥16

New and Old Grade Replacement List

1 Approximate Comparison Table High strength structural steel plates in the quenched and tempered condition

China	International Organization for Standardization	European Standard
GB	ISO	EN
Q550QD GB/T 16270-2009 Q550D GB/T 16270-1996	E550DD ISO 4950-3-2003	S550Q EN 10025-6-2004

2 Approximate Comparison Table High strength structural steel plates in the quenched and tempered condition

China	International Organization for Standardization
GB	ISO
Q550QD GB/T 34560-4-2017 Q550D GB/T 16270-2009	S550QD ISO 630-4-2012

Q550D Corresponding Standards(Same grade name, different standards)

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!