ASTM B688

This specification covers chromium-nickelmolybdenum- iron UNS N08366 and UNS N08367* plate, sheet, and strip for use in corrosive service and heat-resisting applications.This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

Chemical Properties

UNS Designation	Carbon	Manganese	Silicon	Phosphorus	Sulfur	Chromium	Nickel	Molybdenum	Nitrogen	IronA	Copper
N08366	0.035 max	2.00 max	1.00 max	0.040 max	0.030 max	20.00-22.00	23.50-25.50	6.00-7.00	-	remainder	-
N08367	0.030 max	2.00 max	1.00 max	0.040 max	0.030 max	20.00-22.00	23.50-25.50	6.00-7.00	0.18-0.25	remainder	0.75 max

Note A: Iron shall be determined arithmetically by difference.

Mechanical Properties

UNS Designation	Yield strength, 0.2 % offset, min, ksi (MPa)	Tensile strength, min, ksi (MPa)		Elongation in 2 in. or 50 mm or 4D, min, %	Hardness,Bmax
		≤ 3/16 in. (4.8 mm) thick	> 3/16		≤ 3/16 in. (4.8 mm) thick	> 3/16
N08366	35 (240)	75 (515)	75 (515)	30A	95 HRB	212 HBN
N08367	45 (310)	100 (690)	95 (655)	30A	100 HRB	240 HBN

Note A: Not applicable for thickness under 0.015 in. (0.40 mm).

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