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HASTELLOY^® G-35^® alloy Information*

A nickel alloy with outstanding corrosion resistance to "wet process" phosphoric acid,
other oxidizing acids, alkalis, and chloride-bearing media.

HASTELLOY^® G-35^® alloy Site

Principal Features

Chemical Composition

Physical Properties

Iso-Corrosion Diagrams

Mechanical Properties

Welding and Fabrication

Machining

Specifications

HASTELLOY^® G-35 alloy
Technical Briefs

HASTELLOY^® G-35 alloy
Wire Information

Metallurgist Support

Sales Office Addresses

Tubular Products

Fittings & Flanges

Localized Corrosion Data

Critical Crevice (CCT) and Critical Pitting (CPT) Temperatures in Acidified Ferric Chloride
(ASTM G 48, Methods D and C)

	Critical Crevice Temperatures		Critical Pitting Temperatures
ALLOY	°C	°F	°C	°F

316L	0	32	15	59
254SMO^®	30	86	60	140
28	17.5	64	45	113
31	42.5	109	72.5	163
G-30^®	37.5	100	67.5	154
G-35^®	45	113	95	203
625	40	104	100	212
C-2000^®	80	176	>120	>248

Time to Stress Corrosion Cracking in Boiling 45% Magnesium Chloride (ASTM G 36)

Alloy	Time to Cracking

316L	2 h
254SMO^®	24 h
28	36 h
31	36 h
G-30^®	168 h
G-35^®	No Cracking in 1008 h
625	No Cracking in 1008 h
C-2000^®	No Cracking in 1008 h

Uniform Corrosion Data, (G-35, 625)

Chemical	Conc.	Temperature		Corrosion Rate
	wt.%	°C	°F	G-35^®		625
	wt.%	°C	°F	mm/y	mpy	mm/y	mpy

Hydrochloric Acid	1	Boiling		0.05	2.1	0.23	8.9
	5	79	175	1.23	48.3	4.65	183.0
	10	38	100	0.17	6.7	0.30	11.9
	20	38	100	0.42	16.6	0.36	14.1

Hydrobromic Acid	2.5	Boiling		<0.01	0.1	<0.01	0.1
	5	93	200	<0.01	0.1	0.60	23.7
	7.5	93	200	<0.01	<0.1	0.93	36.5
	10	79	175	<0.01	<0.1	0.82	32.3
	20	66	150	0.44	17.2	0.65	25.7

Hydrofluoric Acid	1	79	175	0.15	6.0	0.31	12.2
	5	52	125	0.1	4.0	0.70	27.4
	10	52	125	0.24	9.5	2.23	87.8
	20	52	125	3.49	137.5	4.33	170.5

Sulfuric Acid	10	93	200	<0.01	0.1	0.24	9.5
	20	93	200	0.01	0.3	0.58	23.0
	30	93	200	2.62	103.0	0.68	26.9
	40	79	175	<0.01	0.1	0.58	22.8
	50	79	175	2.30	90.7	0.89	35.2

Nitric Acid	20	Boiling		<0.01	0.1	0.01	0.3
	40	Boiling		0.01	0.4	0.14	5.5
	60	Boiling		0.06	2.2	0.46	18.1
	70	Boiling		0.10	3.8	0.58	22.7

Phosphoric Acid	50	Boiling		0.01	0.2	0.02	0.9
	60	Boiling		0.01	0.4	0.16	6.2
	70	Boiling		0.11	4.4	0.89	35.2
	80	Boiling		0.42	16.7	4.90	193.0

Chromic Acid	10	66	150	0.15	5.9	0.13	5.2
Chromic Acid	20	66	150	0.85	33.4	1.00	39.3

Acetic Acid	99	Boiling		<0.01	<0.1	<0.01	0.1

Formic Acid	88	Boiling		0.07	2.6	0.24	9.3

ASTM G 28A**		Boiling		0.09	3.7	0.48	18.8
N/T = not tested *G 28A = 50% H₂SO₄ + 42g/l Fe₂(SO₄)₃

Uniform Corrosion Data, (Other Alloys)

Chemical	Conc.	Temperature		Corrosion Rate
	wt.%	°C	°F	C-2000^®		G-30^®		C-276
	wt.%	°C	°F	mm/y	mpy	mm/y	mpy	mm/y	mpy

Hydrochloric Acid	1	Boiling		0.01	0.2	0.01	0.4	0.33	13.0
	5	79	175	<0.01	0.1	2.65	104.5	0.75	29.4
	10	38	100	<0.01	<0.1	0.44	17.5	0.17	6.8
	20	38	100	0.16	6.3	0.3	11.7	0.14	5.4

Hydrobromic Acid	2.5	Boiling		0.01	0.2	N/T	N/T	0.13	5.0
	5	93	200	0.01	0.2	N/T	N/T	0.15	5.8
	7.5	93	200	<0.01	0.1	N/T	N/T	0.73	28.7
	10	79	175	<0.01	<0.1	N/T	N/T	0.51	20.0
	20	66	150	<0.01	<0.1	N/T	N/T	0.37	14.5

Hydrofluoric Acid	1	79	175	0.18	7.0	N/T	N/T	0.40	15.9
	5	52	125	0.09	3.7	N/T	N/T	0.34	13.4
	10	52	125	0.22	8.7	N/T	N/T	0.41	16.0
	20	52	125	0.48	18.8	N/T	N/T	0.48	18.8

Sulfuric Acid	10	93	200	0.02	0.8	<0.01	0.1	0.14	5.5
	20	93	200	0.03	1.0	0.36	14.2	0.40	15.6
	30	93	200	0.04	1.5	0.55	21.7	0.42	16.4
	40	79	175	0.01	0.5	0.04	1.9	0.19	7.5
	50	79	175	0.02	0.7	0.26	10.3	0.26	10.3

Nitric Acid	20	Boiling		0.02	0.7	N/T	N/T	0.66	25.9
	40	Boiling		0.24	9.5	N/T	N/T	4.42	174.0
	60	Boiling		0.94	37.0	0.16	6.2	16.21	638.0
	70	Boiling		1.66	65.4	N/T	N/T	21.55	848.5

Phosphoric Acid	50	Boiling		0.03	1.1	0.01	0.4	0.18	6.9
	60	Boiling		0.08	3.2	0.14	5.4	0.28	11.1
	70	Boiling		0.15	6.0	0.35	13.6	0.13	5.2
	80	Boiling		0.4	15.6	0.61	24.1	0.31	12.3

Chromic Acid	10	66	150	0.1	3.9	0.14	5.7	0.13	5.0
Chromic Acid	20	66	150	0.61	24.1	N/T	N/T	0.53	21.0

Acetic Acid	99	Boiling		<0.01	<0.1	0.03	1.0	<0.01	0.1

Formic Acid	88	Boiling		0.01	0.4	0.05	2.1	0.04	1.4

ASTM G 28A**		Boiling		0.67	26.3	0.17	6.8	5.97	235.0
N/T = not tested *G 28A = 50% H₂SO₄ + 42g/l Fe₂(SO₄)₃