Q345B - GB /T 1591-1994

Grade	Q345B
Corresponding Standard	GB /T 1591-1994 High Strength Low Alloy Structural Steels
Classification	Alloy Steel

Q345B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr ^*	Ni ^*	Cu ^*	Ti	V	Nb
Minimum Value	-	-	1	-	-	-	-	-	0.02	0.02	0.015
Maximum Value	0.2	0.55	1.6	0.04	0.04	0.3	0.3	0.3	0.2	0.15	0.06

Q345B Mechanical Properties

thickness t mm	Test Temperature	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
t≤16	Room Temperature	470~630	≥345	≥21
16＜t≤35		470~630	≥325	≥21
35＜t≤50		470~630	≥295	≥21
50＜t≤100		470~630	≥275	≥21
specimen	20°C				≥34

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)

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