phone-icon800.354.0806
765.456.6012
The Home of HASTELLOY® and
HAYNES® Alloys

Top Choice for Nitric Acid Catalyst Grids

For demanding long-term applications as catalyst grid support material in nitric acid production, HAYNES® 230® alloy represents a significant advance over the materials, such as HASTELLOY® X alloy. The increase in resistance to in-service creep distortion displayed by 230 alloy translates directly into as much as 5 times longer service interval between straightening operations. The advantage is greater the higher the operating temperature. 230 alloy is also shows less loss of ductility with long-term thermal exposure. That means when straightening does become necessary, 230 alloy will still have the required ductility.

230 alloy is currently in service in over 30 nitric acid catalyst grid support applications around the world, some for as long as five years or more. Its excellent nitriding-resistance, oxidation-resistance, and resistance to combustion environments, make it suitable for a wide variety of additional industrial applications.

Acid Catalyst 230
Nitric acid catalyst grid support made from HAYNES® 230® alloy and plate bar. Excellent creep strength  at 1700°F (925°C) makes the alloy highly suitable for this application.

Nominal Composition

Nickel: Balance
Cobalt: 5 max.
Chromium: 22
Molybdenum: 2
Tungsten: 14
Iron: 3 max.
Silicon: 0.4
Manganese: 0.5
Carbon: 0.10
Aluminum: 0.3
Boron: 0.015 max.
Lanthanum: 0.02

Typical Tensile Properties, Plate

Test
Temperature
0.2%
Yield Strength
Ultimate
Tensile Strength
Elongation
°F °C ksi MPa ksi MPa %
RT RT 57 395 125 860 50
1000 540 40 275 103 705 53
1200 650 40 275 98 675 55
1400 760 42 275 88 605 53
1600 870 37 255 63 435 65
1800 980 21 145 35 240 83
2000 1095 11 76 20 140 83
2100 1150 7 47 13 91 106
2200 1205 4 30 9 65 109

Typical Rupture Properties, Plate

Test Temperature Typical Rupture Properties: Stress Required to Produce Rupture in Hours Shown
100 h 1,000 h 10,000 h
°F °C ksi MPa ksi MPa ksi MPa
1400 760 25.0 172 17.5 121 11.9 8.2
1500 815 17.0 117 11.8 81 7.8 53
1600 870 11.5 79 7.5 52 4.9 34
1700 915 7.6 52 4.8 33 3.0 21
1800 980 4.8 33 3.0 21 1.9 13

Typical Room Temperature Physical Properties

Physical Property British Units Metric Units
Density 0.324 lb/in3 8.97 g/cm3
Electrical Resistivity 49.2 µohm-in 125 µohm-cm
Modulus of Elasticity 30.6 x 106 psi 211 GPA
Thermal Conductivity 62 Btu-in/ft2-h-°F 8.9 W/m-°C
Specific Heat 0.095 Btu/lb-°F 397 J/Kg-°C

Product Description

230 alloy is a top-of-the-line high-performance, industrial heat-resistant alloy for applications demanding high strength as well as resistance to environment. It is a substantial upgrade in performance capabilities from common iron-nickel-chromium and nickel-chromium alloys, and displays the best combination of strength, stability, environment-resistance and fabricability of any commercial nickel-base alloy.

230 alloy can be utilized at temperatures as high as 2100ºF (1150ºC) for continuous service. Its resistance to oxidation, combustion environments and nitriding commends it highly for applications such as nitric acid catalyst grids, high-temperature bellows, industrial furnace fixtures and hardware, strand annealing tubes, thermo-couple protection tubes, and many more.

230 alloy is covered by ASME Section VIII, Division I, and ASME Section I, Code Case 2063-3, both up to 1650ºF (900ºC). 230 alloy is also covered by a number of ASTM and AMS specifications.

Properties Data

The data and information in this publication are based upon work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature, and are believed to be reliable. However, Haynes International, Inc. does not make any warranty or assume any legal liability or responsibility for its accuracy, completeness, or usefulness. Haynes also makes no warranty of results to be obtained for any particular use of the information here in contained. Material safety data sheets are available from Haynes International, Inc.

Print Page
Back to top