Although not specifically designed for use in applications which require resistance to aqueous corrosion, 242^® alloy does exhibit resistance in some media which compares favorably with that exhibited by traditional corrosion-resistant alloys. Data shown for 242 alloy was generated for samples tested in the mill annealed condition.

			Corrosion Rate, Mils/year (mm/year)
Corrosive	Temperature	Exposure
Media	°F (°C)	Hours	242^® alloy		alloy B-2		C-22 alloy		alloy N
5% HF	175 (79)	24	14	(0.36)	12	(0.30)	25	(0.64)	20	(0.51)
48% HF	175 (79)	24	32	(0.81)	25	(0.64)	27	(0.69)	31	(0.79)
70% HF	125 (52)	24	35	(0.89)	66	(1.68)	32	(0.81)	48	(1.22)
10% HCl	Boiling	24	22	(0.56)	7	(0.18)	400	(10.16)	204	(5.18)
20% HCl	Boiling	24	41	(1.04)	15	(0.38)	380	(9.65)	-
55% H₃PO₄	Boiling	24	3	(0.08)	4	(0.10)	9	(0.23)	-
85% H₃PO₄	Boiling	24	4	(0.10)	4	(0.10)	120	(3.05)	-
10% H₂SO₄	Boiling	24	2	(0.05)	2	(0.05)	11	(0.28)	46	(1.17)
50% H₂SO₄	Boiling	24	5	(0.13)	1	(0.03)	390	(9.91)	-
99% ACETIC	Boiling	24	<1	(<0.03)	1	(0.03)		Nil	-

Haynes International, Inc. 800-354-0806 765-456-6012

HAYNES® 242® alloy Information

An age-hardenable Ni-Mo-Cr alloy that combines high-temperature strength, low thermal expansion characteristics and good oxidation-resistance for service to 1400°F (760°C). Also resistance to high-temperature fluorine and fluoride environments.

HAYNES^® 242^® alloy Information

An age-hardenable Ni-Mo-Cr alloy that combines high-temperature strength, low thermal expansion characteristics
and good oxidation-resistance for service to 1400°F (760°C). Also resistance to high-temperature fluorine and fluoride environments.