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Principle Features

Haynes International, Inc. is pleased to announce the development of HAYNES® HR-224® alloy, a new alloy with excellent oxidation resistance and improved fabricability and weldability compared to HAYNES® 214® alloy. This Ni–27.5Fe–20Cr–3.8Al alloy achieves superior oxidation resistance through the formation of a tightly adherent alumina protective scale. It exhibits excellent ductility and formability characteristics, with weldability on par with nickel-iron-chromium alloys of substantially lower aluminum contents. Potential uses include applications in heat recuperators, automotive catalytic converters and heat shields, strand annealing furnace tubulars, and other severely oxidizing environments.

1,008-Hour Oxidation Resistance Preliminary Test Results

Alloy

 

 

1800°F (982°C) Static Air

1400°F (760°C) Air + 5% Water Vapor

Average Metal Affected

Average Metal Affected

Maximum Metal Affected

-

µm

Mils

µm

Mils

µm

Mils

214®

4

0.2

1.3

0.05

2.8

0.11

HR-224®

4

0.2

2.8

0.11

5.8

0.23

230®

18

0.7

6.1

0.24

10.9

0.43

Average Metal Affected = Metal Loss + Average Penetration; Maximum Metal Affected = Metal Loss + Maximum Internal Penetration 

 

Cross Sections after Exposure to 1400°F (760°C) Air + 5% Water Vapor for 1,008 Hours

HAYNES HR-224 alloy Cross Sections after Exposure

HAYNES® HR-224® Alloy Preliminary Tensile Results

Test

Temperature

0.2% Yield

Strength

Ultimate Tensile Strength

Elongation in 2 in (51mm)

°C

°F

MPa

ksi

MPa

ksi

%

RT

RT

342

50

739

107

45

760

1400

401

58

481

70

27

*RT= Room Temperature

 

HAYNES HR-224 alloy will become available for commercial sale upon completion of key process developments.
It is being manufactured in a variety of forms, including sheet, plate, bar, structural and weld wire,
and welded tubular products. Material for trial evaluations and fabrications is available.
Please contact Dr. Keith Kruger at (765) 456-6098 or kkruger@haynesintl.com for more information.

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