Brief introduction of P690QH steel plate

P690QH is a European standard pressure vessel plate, which belongs to welding fine grain steel. The implementation standard of P690QH steel plate is EN 10028-6-2003, and the heat treatment process of P690QH plate is quenching + tempering.

P690QH steel plate mechanical properties:

Thickness	Mechanical properties
<5mm	ReH(MPa)	≥690	If the yield is not obvious, use Rp0.2 instead of ReH
	Rm(MPa)	770-940
	A(%)	≥14
5-50mm	ReH(MPa)	≥690	If the yield is not obvious, use Rp0.2 instead of ReH
	Rm(MPa)	770-940
	A(%)	≥14
	Impact temperature(℃)	-20
	Akv(J)	≥27
>50-100mm	ReH(MPa)	≥670	If the yield is not obvious, use Rp0.2 instead of ReH
	Rm(MPa)	770-940
	A(%)	≥14
	Impact temperature(℃)	-20
	Akv(J)	≥27
>100-150mm	ReH(MPa)	≥630	If the yield is not obvious, use Rp0.2 instead of ReH
	Rm(MPa)	720-900
	A(%)	≥14
	Impact temperature(℃)	-20
	Akv(J)	≥27

Chemical elemental analysis of P690QH steel plate:
C≤0.2; Si≤0.8; Mn≤1.7; P≤0.025; S≤0.015; Ni≤2.5; Cr≤1.5; Mo≤1.5; Cu≤1.5; Mo≤0.7; Cu≤0.3; Nb≤0.06; V≤ 0.12; Ti≤0.05; N≤0.015; Zr≤0.15; B≤0.005.

Composition Notes: The proportion of grain refining elements should be at least 0.015. Aluminum is also included in these elements, Als≥0.015, Alt≥0.018.