Q390B - GB /T 1591-2018

Grade	Q390B
Corresponding Standard	GB /T 1591-2018 High Strength Low Alloy Structural Steels
Classification	Alloy Steel

Q390B Chemical Element Composition Content (%)

Component	C ^①	Si	Mn	P ^②	S ^②	Cr	Ni	Cu	Mo	N ^⑤	Ti ^④	V ^④	Nb ^③
Minimum Value	-	-	-	-	-	-	-	-	-	-	-	-	-
Maximum Value	0.2	0.55	1.7	0.035	0.035	0.3	0.5	0.4	0.1	0.015	0.05	0.13	0.05

Q390B Mechanical Properties

thickness or diameter t mm	Test Temperature	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
t≤16	Room Temperature	490~650	ReH: ≥390	long. ≥21 tr. ≥20
16<t≤40		490~650	ReH: ≥380	long. ≥21 tr. ≥20
40<t≤63		490~650	ReH: ≥360	long. ≥20 tr. ≥19
63<t≤80		490~650	ReH: ≥340	long. ≥20 tr. ≥19
80<t≤100		490~650	ReH: ≥340	long. ≥20 tr. ≥19
100<t≤150		470~620	ReH: ≥320	long. ≥19 tr. ≥18
specimen	20°C				long. ≥34 tr. ≥27

New and Old Grade Replacement List

Q390B 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"!