Alloy 22

A nickel-chromium-molybdenum grade, Alloy 22 exhibits excellent resistance to both oxidising and reducing environments.

With the addition of tungsten, alloy 22 provides exceptional resistance to pitting and crevice corrosion, in oxidising acid halide environments.

Inventory

Product Form	Size range from	Size range to
Alloy 22 welding wire	0.89 mm	3.175 mm
Alloy 22 sheet & plate	0.96 mm	50.8 mm
Alloy 22 round tubing	6.35 mm	50.8 mm
Alloy 22 round bar	3.175 mm	279.4 mm
Alloy 22 pipe	0.375 in	8 in
Alloy 22 pipe fittings	0.375 in	8 in
Alloy 22 flanges	0.375 in	8 in

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Pipe
Pipe Fittings
Flanges
Welding Consumables
Sheet & Plate
Round Bar

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Chemical Analysis

%	Ni	Cr	Mo	Fe	W	Co	C	Mn	Si	V	P	S
Min	Balance	20	12.5	2	2.5	-	-	-	-	-	-	-
Max	-	22.5	14.5	6	3.5	2.5	0.015	0.5	0.08	0.35	0.02	0.02

Applications

Perfect for applications in the Chemical Processing Industry

Alloy 22 can be used in a variety of applications including:

Reactors and pressure vessels
Nutsche pressure filters
Centrifugers and dryers
Agitators and mixers
Containment vessels and glove boxes
Pollution control equipments
Flue gas desulphurisation (FGD) lined ducts and dampers

About Alloy 22

Due to its high nickel content, Alloy 22 is immune to chloride-induced stress corrosion cracking.

The alloy demonstrates outstanding resistance to pitting and crevice corrosion particularly in high chloride containing environments.

Alloy 22 has exceptional resistance to a large range of chemical process environments, including ferric chlorides, chlorine, hot contaminated solutions, acetic acids, seawater and brine solutions. Alloy 22 is the ideal choice when considering alloys for use in extreme corrosive environments.

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Properties

Density:: 8.61g/cm³
Melting Range:: 1351-1387°C
Hardness:: 89 HRB
Specific Heat Capacity:: 381 J/kg.°C
Electrical Resistivity:: 1.215µΩ.m
Curie Temperature:: < -196°C
Poisson's Ratio:: 0.3

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Mechanical & Physical Properties
Aqueos Corrosion Data

Mechanical & Physical Properties	-196⁰C	20⁰C	100⁰C	200⁰C	300⁰C	400⁰C
Ultimate Tensile Strength for sheet ≤ 50 mm thick		690-950
Ultimate Tensile Strength for bar ≤ 90 mm thick		690-951
0.2% Yield Strength for sheet ≤ 50 mm thick		310	270	225	195	175
0.2% Yield Strength for bar ≤ 90 mm thick		310	290	245	215	195
Elongation, % for sheet ≤ 50 mm thick		45
Elongation, % for bar ≤ 90 mm thick		45
Charpy Impact V-notch men value / J	96	120
Thermal Conductivity		10.1	11.1	13.4	15.5	17.5
Modulus of Elasticity / 10⁵MPA		2.05		1.97		1.85

Media	Common Name	Temp. °F (°C)	Corrosion Rate (mpy)
99% C2H4O2	Acetic Acid	Boiling	NIL
10% FeCl3	Ferric Chloride	Boiling	1
88% CH2O2	Formic Acid	Boiling	<1
1% HCl	Hydrochloric Acid	Boiling	3
5% HCl	Hydrochloric Acid	158 (70)	19
10% HCl	Hydrochloric Acid	Boiling	400
5% HCl + 42 g/l Fe2(SO4)3	Mixed Acid	150 (66)	2
5% HCl + 2% HF	Mixed Acid	158 (70)	59
5% HF	Hydrofluoric Acid	158 (70)	14
85% H3PO4	Phosphoric Acid	Boiling	13
44% P2O5	Phosphoric Oxide	240 (116)	21
38% P2O5 + 2000ppm Cl	Mixed Acid	185 (85)	1
38% P2O5 + 0.5% HF	Mixed Acid	185 (85)	7
10% HNO3	Nitric Acid	Boiling	<1
65% HNO3	Nitric Acid	Boiling	134
5% HNO3 + 6% HF	Mixed Acid	140 (60)	67
5% HNO3 + 25% H2SO4 + 4% NaCl	Mixed Acid	Boiling	12
5% HNO3 + 1% HCl	Mixed Acid	Boiling	<1
5% HNO3 + 2.5% HCl	Mixed Acid	Boiling	2
8.8% HNO3 +15.8% HCl	Mixed Acid	126 (52)	4
2% H2SO4	Sulphuric Acid	Boiling	5
10% H2SO4	Sulphuric Acid	Boiling	12
20% H2SO4	Sulphuric Acid	Boiling	33
50% H2SO4	Sulphuric Acid	174 (79)	16
80% H2SO4	Sulphuric Acid	199 (93)	68
10% H2SO4 + 1% HCl	Mixed Acid	194 (90)	94
25% H2SO4 + 200 ppm Cl-	Mixed Acid	158 (70)	11
23% H2SO4 + 1.2% HCl + 1% FeCl3 + 1% CuCl2	ASTM G28B	Boiling	8
50% H2SO4 + 42g/l Fe2(SO4)3	ASTM G28A	Boiling	40

Mechanical & Physical Properties

Mechanical & Physical Properties	-196⁰C	20⁰C	100⁰C	200⁰C	300⁰C	400⁰C
Ultimate Tensile Strength for sheet ≤ 50 mm thick		690-950
Ultimate Tensile Strength for bar ≤ 90 mm thick		690-951
0.2% Yield Strength for sheet ≤ 50 mm thick		310	270	225	195	175
0.2% Yield Strength for bar ≤ 90 mm thick		310	290	245	215	195
Elongation, % for sheet ≤ 50 mm thick		45
Elongation, % for bar ≤ 90 mm thick		45
Charpy Impact V-notch men value / J	96	120
Thermal Conductivity		10.1	11.1	13.4	15.5	17.5
Modulus of Elasticity / 10⁵MPA		2.05		1.97		1.85

Aqueos Corrosion Data

Media	Common Name	Temp. °F (°C)	Corrosion Rate (mpy)
99% C2H4O2	Acetic Acid	Boiling	NIL
10% FeCl3	Ferric Chloride	Boiling	1
88% CH2O2	Formic Acid	Boiling	<1
1% HCl	Hydrochloric Acid	Boiling	3
5% HCl	Hydrochloric Acid	158 (70)	19
10% HCl	Hydrochloric Acid	Boiling	400
5% HCl + 42 g/l Fe2(SO4)3	Mixed Acid	150 (66)	2
5% HCl + 2% HF	Mixed Acid	158 (70)	59
5% HF	Hydrofluoric Acid	158 (70)	14
85% H3PO4	Phosphoric Acid	Boiling	13
44% P2O5	Phosphoric Oxide	240 (116)	21
38% P2O5 + 2000ppm Cl	Mixed Acid	185 (85)	1
38% P2O5 + 0.5% HF	Mixed Acid	185 (85)	7
10% HNO3	Nitric Acid	Boiling	<1
65% HNO3	Nitric Acid	Boiling	134
5% HNO3 + 6% HF	Mixed Acid	140 (60)	67
5% HNO3 + 25% H2SO4 + 4% NaCl	Mixed Acid	Boiling	12
5% HNO3 + 1% HCl	Mixed Acid	Boiling	<1
5% HNO3 + 2.5% HCl	Mixed Acid	Boiling	2
8.8% HNO3 +15.8% HCl	Mixed Acid	126 (52)	4
2% H2SO4	Sulphuric Acid	Boiling	5
10% H2SO4	Sulphuric Acid	Boiling	12
20% H2SO4	Sulphuric Acid	Boiling	33
50% H2SO4	Sulphuric Acid	174 (79)	16
80% H2SO4	Sulphuric Acid	199 (93)	68
10% H2SO4 + 1% HCl	Mixed Acid	194 (90)	94
25% H2SO4 + 200 ppm Cl-	Mixed Acid	158 (70)	11
23% H2SO4 + 1.2% HCl + 1% FeCl3 + 1% CuCl2	ASTM G28B	Boiling	8
50% H2SO4 + 42g/l Fe2(SO4)3	ASTM G28A	Boiling	40

Specifications

UNS Number:: N06022
Werkstoff Number:: 2.4602
Standards:: ASTM B564, B574, B575, B619, B622, B626, B366, B462, B775

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