Media	Concentration, Percent by Weight	Test Temperature		Average Corrosion Rate per year, Mils*
Media	Concentration, Percent by Weight	°F	(°C)	C-276 alloy	C-22^® alloy	C-4 alloy	625 alloy

Acetic Acid	99	Boiling		<1	Nil	Nil	<1

Ferric Chloride	10	Boiling		2	<1	140	7325

Formic Acid	88	Boiling		1	1	2	9

Hydrochloric Acid	1	Boiling		13	3	25	1

	1.5	Boiling		32	14	64	353

	2	194	(90)	1	Nil	31	Nil

	2	Boiling		51	61	82	557

	2.5	194	(90)	12	<1	34	72

	2.5	Boiling		85	141	44	605

	10	Boiling		288	400	228	642

Hydrochloric Acid + 42g/l Fe₂(SO₄)₃	1	200	(93)	41	2	-	238
Hydrochloric Acid + 42g/l Fe₂(SO₄)₃
	5	150	(66)	5	2	3	2

Hydrochloric Acid + 2% HF	5	158	(70)	26	59	34	123

Hydrofluoric Acid	2	158	(70)	9	9	17	20

	5	158	(70)	10	14	15	16

P₂O₅ (Commercial Grade)	38	185	(85)	9	2	-	1

	44	240	(116)	100	21	-	23

	52	240	(116)	33	11	-	12

P₂O₅ + 2000 ppm Cl	38	185	(85)	12	1	-	2

P₂O₅ + 0.5% HF	38	185	(85)	45	7	-	9

Nitric Acid	10	Boiling		7	<1	7	<1

	65	Boiling		888	134	217	21

Nitric Acid + 6% HF	5	140	(60)	207	67	204	73

Nitric Acid + 25% H₂SO₄ + 4% NaCl	5	Boiling		64	12	97	713

Nitric Acid + 1% HCl	5	Boiling		8	<1	11	1

Nitric Acid + 2.5% HCl	5	Boiling		21	2	26	<1

Nitric Acid + 15.8% HCl	8.8	126	(52)	33	4	114	>10,000

Sulfuric Acid	2	150	(66)	<1	Nil	Nil	Nil

	2	Boiling		6	5	6	6

	5	174	(79)	1	<1	1	<1

	5	Boiling		12	9	16	16

	10	Boiling		19	12	25	37

	20	150	(66)	<1	<1	<1	<1

	20	174	(79)	3	1	2	13

	20	Boiling		39	33	36	91

	30	150	(66)	1	<1	<1	<1

	30	174	(79)	4	3	3	27

	30	Boiling		55	64	73	227

	40	100	(38)	<1	<1	<1	<1

	40	150	(66)	1	<1	9	1

	40	174	(79)	10	9	15	35

	50	100	(38)	Nil	<1	<1	1

	50	150	(66)	4	1	13	25

	50	174	(79)	12	16	25	58

	60	100	(38)	<1	<1	1	<1

	70	100	(38)	Nil	Nil	2	<1

	80	100	(38)	<1	Nil	<1	<1

Sulfuric Acid + 0.1% HCl	5	Boiling		33	26	49	151

Sulfuric Acid + 0.5% HCl	5	Boiling		49	61	91	434

Sulfuric Acid +1% HCl	10	158	(70)	11	<1	24	121

	10	194	(90)	45	94	66	326

	10	Boiling		116	225	192	869

Sulfuric Acid + 2% HF	10	Boiling		22	29	26	55

Sulfuric Acid + 200 ppm Cl^-	25	158	(70)	12	11	37	110
Sulfuric Acid + 200 ppm Cl^-
	25	Boiling		186	215	182	325

Sulfuric Acid + 1.2% HCl + 1% FeCl₃ + 1% CuCl₂	11.5	Boiling		42	3	837	1815

Sulfuric Acid + 1.2% HCl + 1% FeCl₃ + 1% CuCl₂ (ASTM G28B)	23	Boiling		55	8	2155	2721

Sulfuric Acid + 42 g/l Fe₂(SO₄)₃ (ASTM G28B)	50	Boiling		250	40	143	23

* To convert mils per year (mpy) to mm per year, divide by 40.

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

HASTELLOY® C-276 alloy Information*

Excellent corrosion-resistance to both oxidizing and reducing media and excellent resistance to localized corrosion attack.

HASTELLOY^® C-276 alloy Information*

Excellent corrosion-resistance to both oxidizing and reducing media
and excellent resistance to localized corrosion attack.