Incoloy Alloy 825

General

This grade is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The nickel content is sufficient for resistance to chloride-ion stress-corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids. The molybdenum also aids resistance to pitting and crevice corrosion. The alloy’s chromium content confers resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salt. The titanium addition serves, with an appropriate heat treatment, to stabilize the alloy against sensitization to intergranular corrosion.

Chemical Composition

	Ni	Al	Ti	Cr	C	Si	Cu	Mn	Fe	S	Mo
Min %	38.00	–	0.60	19.50	–	–	1.50	–	22.00	–	2.50
Max %	46.00	0.20	1.20	23.50	0.05	0.50	3.00	1.00	–	0.03	3.50
Other Elements

Mechanical Properties (Annealed)

	MPA	%
Tensile Strength.	690
Yield Strength (0.2% offset)	324
Elongation in 2” (50mm) or 4D		45
Reduction of Area,
Hardness

Alternative Designations

Incoloy 825, Alloy 825, Nickelvac 825, Nicrofer 4241, W. Nr. 2.4858, BS 3076 NA16, ASTM B 425, ASTM B 564, ASME SB 425, ASME SB 564, ASME Code Case N-572, DIN 17752, DIN 17753, DIN 17754, VdTÜV 432, ISO 9723, ISO 9724, ISO 9725. NACE MR0175 for oil and gas service.

The data contained in this publication is for informational purposes only and may be revised at any time without prior notice. The data is believed to be accurate and reliable, but Hague Fasteners Limited makes no representation or warranty of any kind (express or implied) and assumes no liability with respect to the accuracy or completeness of the information contained herein. Although the data is believed to be representative of the product, the actual characteristics or performance of the product may vary from what is shown in this publication. Nothing contained in this publication should be construed as guaranteeing the product for a particular use or application.