Q355B - GB /T 1591-2018

Grade	Q355B
Corresponding Standard	GB /T 1591-2018 High Strength Low Alloy Structural Steels
Classification	Alloy Steel
Properties	High Strength

Q355B Chemical Element Composition Content (%)

	Component	C ^①	Si	Mn	P ^②	S ^②	Cr	Ni	Cu	N ^③
厚度t≤30	Minimum Value	-	-	-	-	-	-	-	-	-
厚度t≤30	Maximum Value	0.24	0.55	1.6	0.035	0.035	0.3	0.3	0.4	0.012

	Component	C ^①	Si	Mn	P ^②	S ^②	Cr	Ni	Cu	N ^③
厚度30<t≤100	Minimum Value	-	-	-	-	-	-	-	-	-
厚度30<t≤100	Maximum Value	0.22	0.55	1.6	0.035	0.035	0.3	0.3	0.4	0.012

Q355B 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	470~630	ReH: ≥355	long. ≥22 tr. ≥20
16<t≤40		470~630	ReH: ≥345	long. ≥22 tr. ≥20
40<t≤63		470~630	ReH: ≥335	long. ≥21 tr. ≥19
63<t≤80		470~630	ReH: ≥325	long. ≥20 tr. ≥18
80<t≤100		470~630	ReH: ≥315	long. ≥20 tr. ≥18
100<t≤150		450~600	ReH: ≥295	long. ≥18 tr. ≥18
150<t≤200		450~600	ReH: ≥285	long. ≥17 tr. ≥17
200<t≤250		450~600	ReH: ≥275	long. ≥17 tr. ≥17
specimen	20°C				long. ≥34 tr. ≥27

New and Old Grade Replacement List

Approximate Comparison Table High strength low alloy structural steels

China	International Organization for Standardization	European Standard
GB	ISO	EN
Q355B GB/T 1591-2018	S355B ISO 630-2-2011	S355JR EN 10025-2-2004

Q355B Corresponding Standards(Same grade name, different standards)

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