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Heat Treatment and Fabrication

Heat Treatment

Wrought HAYNES® 282® alloy is furnished in the solution annealed condition unless otherwise specified. After component fabrication, the alloy would normally again be solution annealed at 2050 to 2100°F (1121 to 1149°C) for a time commensurate with section thickness and rapidly cooled or water-quenched for optimal properties. Following solution annealing, the alloy is given a two-step age-hardening treatment to optimize the microstructure and induce age-hardening. The first step is 1850°F (1010°C) for 2 hours followed by rapid or air cooling. The second step is 1450°F (788°C) for 8 hours followed by air cooling.

NOTE: The heat treatment for Advanced Ultra-Supercritical (A-USC), Supercritical CO2, and Other ASME Boiler Code Applications is different from the standard heat treatment.  For information regarding the heat treatment for ASME code related applications, please click here.

Hot and Cold Working

HAYNES® 282® alloy has excellent forming characteristics. It may be hot-worked at temperatures in the range of about 1750-2150°F (955-1177°C) provided the entire piece is soaked for a time sufficient to bring it uniformly to temperature. Initial breakdown is normally performed at the higher end of the range, while finishing is usually done at the lower temperatures to afford grain refinement.

As a consequence of its good ductility, 282® alloy is also readily formed by cold-working. Intermediate annealing may be performed at 2050 to 2100°F (1121 to 1149°C) for a time commensurate with section thickness and rapidly cooled or water-quenched, to ensure maximum formability. All hot- or cold-worked parts should normally be annealed prior to age-hardening (as described in the “Heat Treatment” section) in order to develop the best balance of properties.

Cold Forming Characteristics

Average Room-Temperature Hardness and Tensile Properties of
Solution Annealed HAYNES® 282® alloy

Form Hardness 0.2% Yield Strength Ultimate Tensile Strength Elongation Reduction of Area
- HRB ksi MPa ksi MPa % %
Sheet 90 56 384 122 839 59 -
Plate 93 56 384 120 830 60 61
Bar 86 51 348 118 816 62 69

Hardness vs. Cold Work (Sheet)

Alloy 0% 10% 20% 30% 40% 50%
282® 93 HRB 26 HRC 33 HRC 38 HRC 41 HRC 43 HRC
R-41 96 HRB 30 HRC 36 HRC 39 HRC 41 HRC 42 HRC
Waspaloy 94 HRB 26 HRC 32 HRC 37 HRC 39 HRC 41 HRC
263 89 HRB 19 HRC 27 HRC 33 HRC 37 HRC 39 HRC
625 97 HRB 32 HRC 37 HRC 40 HRC 42 HRC 45 HRC

Effect of Cold Reduction on Room-Temperature Tensile Properties*

Cold Reduction 0.2% Yield Strength Ultimate Tensile Strength Elongation
% ksi MPa ksi MPa %
0 55.5 383 121.0 834 58.0
10 87.8 605 131.8 909 46.7
20 114.5 790 144.9 999 31.5
30 139.7 963 165.4 1141 15.5
40 158.5 1093 184.2 1270 8.9
50 174.7 1204 200.4 1382 6.6
60 190.4 1312 215.4 1485 5.6

*Based upon rolling reductions taken upon a solution annealed 0.125” (3.2 mm) thick sheet
HRB = Hardness Rockwell “B”.
HRC = Hardness Rockwell “C”.

Hardness of Solution Annealed Sheet Versus % Cold Work

282 - hardness

Machining

HAYNES® 282® alloy has similar machining characteristics to other nickel alloys used at high temperatures. Rough machining should be carried out prior to age-hardening. Final machining or finish grinding may be done after age-hardening. Machining guidelines can be found in the Welding and Fabrication section of this website.  If further information is required, please contact the technical support group at Haynes International

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