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45# Low Alloy Structural Steel

Steelmaking Products

Name	Implementation Standards
Name	Standard	Grade	AS M E / ASTM	JIS	DIN	EN
High strength low alloy structural steel	GB/T1 591-2008	Q345B	Gr.50/Gr.345	SPFC590	S335JR	EN S335JR
		Q345C	Gr.50/Gr.345	SPFC590	S335JO	EN S335JO
		Q345D	Gr.50/Gr.345	SPFC590	S335J2	EN S335J2
		Q345E	Gr.50/Gr.345	SPFC590	S335NL	EN S335NL

Chemical Composition

Grade

Chemical Composition（%）

C≤

Al≥

Cr≤

Ni≤

Q345

0.2

1~1.6

0.55

0.040

0.02

0.015

0.060

0.02

0.20

0.035

0.015

0.18

0.030

0.015

0.025

0.015

Mechanical Properties

Grade	Grade	Yield Point òs/Mpa				Tensile Strength òs/Mpa	Elongation（%）≥	The impact absorbing energy of Akv (vertical) /J
		Thickness (Diameter, Length)/mm						The impact absorbing energy of Akv (vertical) /J
		≤16	＞16~35	＞35~50	＞50~100			+20℃	0℃	-20℃	-40℃
Q345	B	345	325	295	275	470 ~ 630	21	34
	C						22		34
	D						22			34
	E						22				27

Applicable Scope

High strength low alloy structural steel, in carbon steel (Wc=0.16%~0.2%) on the basis of adding a small amount of alloy elements is made, has good welding performance, plasticity, toughness and machining process, good corrosion resistance, high strength and low brittleness critical transition temperature. Its brand representation is basically the same as carbon structural steel. It is suitable for manufacturing structural parts of buildings, bridges, ships, vehicles, railways, high pressure vessels, boilers, automobiles, tractors, large steel structures and large military projects.