Q690D high-strength structural steel plate

Q690D high-strength structural steel plate can require thickness direction performance, Z15, Z25,
Z35, such as Q690D-Z15, Q690D-Z25, Q690D-Z35, etc.
Q690D steel plate technical standard: GB/T 16270.
Q690D steel plate heat treatment: Q+T, quenching + tempering.

Chemical composition of Q690D steel plate:

Grade	C	Si	Mn	P	S	Ni
Q690D	≤0.2	≤0.8	≤1.8	≤0.025	≤0.015	≤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 Q690D high-strength structural steel plate:

Thickness	Mechanical properties
≤50mm	ReH(MPa)	≥690	When the yield is not obvious, use Rp0.2
	Rm(MPa)	770-940
	A(%)	≥14
	Impact temperature	-20
	Akv(J)	≥47	Longitudinal
>50-100mm	ReH(MPa)	≥650	When the yield is not obvious, use Rp0.2
	Rm(MPa)	760-930
	A(%)	≥14
	Impact temperature	-20
	Akv(J)	≥47	Longitudinal
>100-150mm	ReH(MPa)	≥630	When the yield is not obvious, use Rp0.2
	Rm(MPa)	710-900
	A(%)	≥14
	Impact temperature	-20
	Akv(J)	≥47	Longitudinal

Q690D steel smelting method:
Converter / electric furnace steelmaking → LF furnace refining → VD furnace vacuum degassing → continuous casting / die casting / electroslag → cleaning and heating → rolling → flaw detection → heat treatment → steel plate finishing → sampling → performance inspection

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