Q345B L03452 - GB /T 1591-2008

Grade	Q345B
China ISC	L03452
Corresponding Standard	GB /T 1591-2008 High Strength Low Alloy Structural Steels
Brand/Supplier	China -> BENSTEEL
Classification	Alloy Steel
Properties	Low-Temperature Resistance Good Forgability Good Machinability Good Weldability

Q345B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N	Ti	V	Nb
Minimum Value	-	-	-	-	-	-	-	-	-	-	-	-	-
Maximum Value	0.2	0.5	1.7	0.035	0.035	0.3	0.5	0.3	0.1	0.012	0.2	0.15	0.07

Q345B 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	470~630	≥345	≥20
16< t≤ 40	470~630	≥335	≥20
40＜t≤63	470~630	≥325	≥19
63＜t≤80	470~630	≥315	≥19
80＜t≤100	470~630	≥305	≥19
100＜t≤150	450~600	≥285	≥18
150＜t≤200	450~600	≥275	≥17
200＜t≤250	450~600	≥265	≥17

New and Old Grade Replacement List

Approximate Comparison Table Carbon Structural Steel and Engineering Steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	SS	BS EN/BS
Q345B Q345C	SM490A SS490	A572 A678Gr.A SSGrade50	E355C Fe510B	St52-3	E36-2	S355JR Fe510B	1.0045	2132-01	50B

Q345B 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"!