HOT News

• Improper welding of X80 pipeline may cause cracks
• Brief introduction of API X52 pipeline steel
• The difference between PSL1 and PSL2
• Harm of inclusions in X70 pipeline steel
• API 5L pipeline pipe
• X52 steel plate surface quality standards that need to be met
• The basic production process of API 5L X60 pipeline steel
• The key to Q460D steel welding process
• What does the heat treatment of Q690 Steel include?
• Reasons for choosing Q690D steel

European standard quenched and tempered steel S690Q plate

Posted:2022-01-14 10:36:33

S690Q plate is a European standard quenched and tempered high yield strength structural steel, S represents structural steel, Q represents delivery conditions, 690 is the yield value, in MPa, which can be divided into S690Q, S690Q L and S690Q L1.

S690Q steel plate delivery status: quenching + tempering.

Melting analysis of chemical composition of S690Q steel plate:

C

Si

Mn

P

S

Ni

Cr

Mo

Cu

Nb

V

Ti

N

Zr

B

≤0.2

≤0.8

≤1.7

≤0.025

≤0.015

≤2

≤1.5

≤0.7

≤0.5

≤0.06

≤0.12

≤0.05

≤0.015

≤0.15

≤0.005

Mechanical properties of S690Q plate:

Thickness	Mechanical properties
3-50mm	ReH(MPa)	≥690
	Rm(MPa)	770-940
	A(%)	≥14
	Impact temperature	-20
	Longitudinal Akv(J)	≥30
>50-100mm	ReH(MPa)	≥650
	Rm(MPa)	760-930
	A(%)	≥14
	Impact temperature	-20
	Longitudinal Akv(J)	≥30
>100-150mm	ReH(MPa)	≥630
	Rm(MPa)	710-900
	A(%)	≥14
	Impact temperature	-20
	Longitudinal Akv(J)	≥30

European standard quenched and tempered steel S690Q plate steelmaking process:
Converter / electric furnace steelmaking → LF furnace refining → VD furnace vacuum degassing → continuous casting / mold casting / electroslag → cleaning and heating → rolling → flaw detection → heat treatment → steel plate finishing → sampling → performance inspection.