9Ni590B/9Ni590A steel introduction

9Ni590 is a Ni series low-temperature steel. 9Ni590 is divided into 9Ni590B and 9Ni590A, which are low-alloy high-strength steels. 9Ni590B/A is a 9% Ni steel plate for low-temperature pressure vessels. 9Ni steel is used in a low temperature environment of -196 degrees Celsius, and the thickness of the review is 50mm. 9Ni590B and 9Ni590A steels are widely used in key parts of cryogenic pressure vessels such as cryogenic transport tankers and LNG storage tanks.

9Ni590B/9Ni590A steel executive standard: GB 24510.
9Ni590B/9Ni590A steel chemical element composition, finished product melting analysis:

C	Si	Mn	P	S	Ni	Cr	Mo	Cu	V
≤0.1	≤0.35	0.3-0.8	≤0.010	≤0.005	8.5-10	≤0.25	≤0.1	≤0.35	≤0.010

Remarks on composition: When the steel contains Al (Als≥0.015) or other nitrogen-fixing elements, N≤0.012, otherwise N≤0.009; Cr+Mo+Cu≤0.5.

9Ni590B/9Ni590A steel mechanical properties analysis:

Thickness	Mechanical properties
≤30mm	ReH(MPa)	≥590	When the yield is not obvious, use Rp0.2
	Rm(MPa)	680-820
	A(%)	≥18
	Impact Temperature	-196
	Akv(J)	≥80	Horizontal
	Remark	Delivery status: quenched + tempered or twice quenched + tempered; steel plates with thickness ≤ 15mm can be delivered in double normalized + tempered state
>30-50mm	ReH(MPa)	≥575	When the yield is not obvious, use Rp0.2
	Rm(MPa)	680-820
	A(%)	≥18
	Impact Temperature	-196
	Akv(J)	≥80	Horizontal
	Remark	Delivery condition: quenched + tempered or twice quenched + tempered

9Ni590B/9Ni590A steel ultrasonic inspection flaw detection standard: GB/T 2970-2016; 9Ni590B/9Ni590A steel flaw detection level: first-level flaw detection, second-level flaw detection, third-level flaw detection.