Quenched and tempered high-strength Q620E steel plate

Q620E quenched and tempered high-strength steel, Q represents the first letter of the Chinese pinyin of the word "yield" for yield strength; 460 represents the value of the yield strength, in MPa; E represents the quality level of E, impact at -40℃.

Technical specification for Q620E steel plate: GB/T 16270.
Q620E steel plate heat treatment delivery status: Q+T (quenching + tempering).

Melting analysis of chemical composition of Q620E steel plate:

Grade	C	Si	Mn	P	S	Ni
Q620E	≤0.2	≤0.8	≤1.7	≤0.02	≤0.010	≤2
Cr	Mo	Cu	Nb	V	Ti	B
≤1.5	≤0.7	≤0.5	≤0.06	≤0.12	≤0.05	≤0.005

Mechanical properties of Q620E steel plate:

Thickness	Mechanical properties
≤50mm	ReH(MPa)	≥620	When the yield is not obvious, use Rp0.2
	Rm(MPa)	700-890
	A(%)	≥15
	Impact temperature	-40
	Akv(J)	≥34	Longitudinal
>50-100mm	ReH(MPa)	≥580	When the yield is not obvious, use Rp0.2
	Rm(MPa)	700-890
	A(%)	≥15
	Impact temperature	-40
	Akv(J)	≥34	Longitudinal
>100-150mm	ReH(MPa)	≥560	When the yield is not obvious, use Rp0.2
	Rm(MPa)	650-830
	A(%)	≥15
	Impact temperature	-40
	Akv(J)	≥34	Longitudinal

Q620E steel plate is mainly used to manufacture low-temperature high-strength structural parts, construction machinery, mining machinery and other large welded structural parts. Such as: drilling rigs, electric shovels, mining trucks, excavators, loaders, bulldozers, various cranes, coal mine hydraulic supports and other mechanical equipment and other structural parts used in mines and various engineering constructions.