Although the 9% nickel alloy steel is not utilized normally for elevated temperature service, specific requirements allow pressure vessels to be cycled from moderately elevated temperatures to subzero temperature. A few experimental short time elevated-temperature tensile data for both NNT & QT 9% nickel steel plates are presented in below tables (*Temp.: test temperature; *THK.: plate thickness; *HT: heat treatment type; *T.S: tensile strength; *Y.S: yield strength @ 0.2% offset; *EL.: elongation 1 inch; *RA.: reduction of area).

*Temp. °F	*THK. inch	*HT	*T.S, ksi	*Y.S, ksi	*EL. %	*RA. %
Room	1/2	QT	110	93	25	74
250	1/2	QT	101	91	23	73
450	1/2	QT	101	90	23	73
650	1/2	QT	95	82	31	78
850	1/2	QT	76	68	26	79

*Tensile properties for quenched & tempered 9% nickel steel plates, 1/2″.

*Temp. °F	*THK. inch	*HT	*T.S, ksi	*Y.S, ksi	*EL. %	*RA. %
Room	1/2	NNT	110	88	26	71
250	1/2	NNT	100	77	24	71
450	1/2	NNT	102	76	26	69
650	1/2	NNT	91	70	30	77
850	1/2	NNT	70	60	30	81

*Tensile properties for double-normalized & tempered 9% nickel steel plates, 1/2″.

*Temp. °F	*THK. inch	*HT	*T.S, ksi	*Y.S, ksi	*EL. %	*RA. %
Room	2	QT	109	100	25	72
250	2	QT	102	91	23	73
450	2	QT	101	88	22	69
650	2	QT	96	83	29	77
850	2	QT	76	70	26	82

*Tensile properties for quenched & tempered 9% nickel steel plates, 2″

*Temp. °F	*THK. inch	*HT	*T.S, ksi	*Y.S, ksi	*EL. %	*RA. %
Room	2	QT	109	100	25	72
250	2	QT	102	91	23	73
450	2	QT	101	88	22	69
650	2	QT	96	83	29	77
850	2	QT	76	70	26	82

*Tensile properties for double-normalized & tempered 9% nickel steel plates, 2″.