			Average
		Concentration	Corrosion Rate Per Year
Acid Medium		Weight Percent	Mils	mm
Acetic Acid		10	0.2	0.005
		30	0.2	0.005
		50	0.2	0.005
		70	0.2	0.005
		99 (Glacial)	0.7	0.017

Formic Acid		10	0.4	0.010
		20	0.6	0.015
		30	0.6	0.015
		40	0.5	0.013
		60	0.3	0.008
		89	0.2	0.005

Hydrochloric Acid		1	0.3	0.005
		2	1.2	0.03
		5	3.8	0.10
		10	5.5	0.14
		15	8.6	0.22
		20	12.1	0.31
	(As-welded)	20	13.6	0.35
	(50 ppm Fe⁺³)	20	80.0	2.0

Phosphoric Acid		10	2.4	0.06
(Chemically Pure)		30	2.0	0.05
		50	3.0	0.08
		85	2.9	0.07

Sulfuric Acid		2	0.4	0.010
		5	0.7	0.018
Phosphoric Acid		10	0.8	0.020
(Chemically Pure)		20	1.2	0.03
		30	1.2	0.03
	(50 ppm Fe⁺³)	30	18.8	0.48
		40	1.2	0.03
		50	1.7	0.04
	(As-welded)	50	2.4	0.06
	(Aged 48 Hrs @ 1000°F (540°C))	50	2.0	0.05
		60	2.3	0.06
		70	6.6	0.17

* Data from three production heats, for material in the solution heat-treated condition, unless noted. Test values were determined from an average of four 24 hour exposures.

Comparative Uniform Corrosion Resistance in Boiling Acids

	Average Corrosion Rates Per Year, Mils (mm)
	B-3^®		B-2		Type		MONEL^® 400
Acid Medium	alloy		alloy		316L		alloy
50% Acetic Acid	0.2	(0.005)	0.4	(0.010)	0.2	(0.005)	-
40% Formic Acid	0.5	(0.013)	0.7	(0.018)	41	(1.041)	2.1	(0.053)
50-55% Phosphoric Acid	3.0	(0.076)	6	(0.152)	18	(0.457)	4.5	(0.114)
50% Sulfuric Acid	1.7	(0.043)	1.2	(0.030)	>20,000	(>500)	185	(4.699)
20% Hydrochloric Acid	12	(0.305)	15	(0.381)	>20,000	(>500)	1587	(40.310)

Average Uniform Corrosion Resistance in HF Solutions*

	Average Corrosion Rates Per Year For Indicated Temperatures
	125°F (52°C)		175°F (79°C)
% HF	Mils	mm	Mils	mm
1	8.6	0.22	11.1	0.28
3	8.7	0.22	12.7	0.32
5	9.0	0.23	13.7	0.35
10	10.0	0.25	15.9	0.41
20	11.8	0.30	22.8	0.58
48	13.4	0.34	35.0	0.89
70	31.6	0.80	-	-

* Data from three production heats, for material in the solution heat-treated condition.

Comparative Stress Corrosion Cracking Resistance

U-Bend Specimens (ASTM G-30 Stress Method) Boiling 60% H₂SO₄

HASTELLOY^® B-3^® alloy Annealed + 1 hr at 1290°F (700°C) (No cracking, 24 hours)	HASTELLOY B-2 alloy Annealed + 1 hr at 1290°F (700°C) (Intergranular cracking, 3 hours)

Flat, Sheet Specimens Mill Annealed and Aged 1 Hour at 1290°F (700°C)
Boiling Solution	B-2 alloy	B-3 alloy
5%H₂SO₄	IG-SCC	NC**
0.5%H₂SO₄	IG-SCC	NC
20%HCl	IG-SCC	NC
* Intergranular stress-corrosion cracking at stamped identification sites. ** No Cracking

Effect of Cold Work Upon Corrosion Resistance in Boiling 20% HCl*

%	Hardness	Ultimate Tensile Strength		Yield Strength at 0.2% Offset		Elongation in 2" (51mm)	Corrosion Rate Per Year
Coldwork	Rc	Ksi	MPa	Ksi	MPa	% EL	Mils	(mm)
0	18	125	860	62	425	57	13	(0.33)
10	30	140	965	100	690	40	13	(0.33)
20	37	159	1095	130	895	25	13	(0.33)
30	41	180	1240	154	1060	13	13	(0.33)
40	44	202	1395	172	1185	9	13	(0.33)
50	46	221	1525	183	1260	8	13	(0.33)

* Exposure for four 24 hour periods

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

HASTELLOY® B-3 ® alloy Information*

A nickel-molybdenum alloy with outstanding resistance to hydrochloric and sulfuric acids in the as-welded condition and excellent thermal stability.

HASTELLOY^® B-3 ^® alloy Information*

A nickel-molybdenum alloy with outstanding resistance to hydrochloric and sulfuric acids
in the as-welded condition and excellent thermal stability.