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HAYNES® Alloys

Fabrication

HAYNES® 25 alloy has good forming and welding characteristics. It may be forged or otherwise hot-worked, providing that it is held at 2200°F (1205°C) for a time sufficient to bring the entire piece to temperature. The alloy has good ductility, and thus also may be formed by cold working. The alloy does work-harden very rapidly, however, so frequent intermediate annealing treatments will be needed for complex component forming operations. All hot- or cold-worked parts should be annealed and rapidly cooled in order to restore the best balance of properties. The alloy can be welded by both manual and automatic welding methods, including gas tungsten arc (GTAW), gas metal arc (GMAW), shielded metal arc, electron beam and resistance welding. It exhibits good restraint welding characteristics.

Heat Treatment

HAYNES® 25 alloy is furnished in the solution heat-treated condition, unless otherwise specified.  The alloy is normally final solution heat-treated at 2150 to 2250°F (1175 to 1230°C) for a time commensurated with section thickness and rapidly cooled or water-quenched for optimal properties. Because annealing at temperatures less than the solution heat-treating temperature will produce some carbide precipitation in 25 alloy, which may affect the alloy’s properties, annealing during fabrication may be performed at lower temperatures, but a final, subsequent solution heat treatment is needed to produce optimum properties and structure. 

Machining

For information on Machining, please refer to the machining section of Welding and Fabrication.

Effect of Cold Reduction Upon Room-Temperature Properties*

Cold Reduction Subsequent
Anneal
0.2% Yield Strength Ultimate Tensile Strength Elongation Hardness
% None ksi MPa ksi MPa % HRC
0 68.4 470 144.0 995 58.5 24
10 123.6 850 181.9 1255 37.1 36
15 148.5 1025 178.2 1230 27.7 40
20 150.9 1040 193.5 1335 18.2 42
25 183.9 1270 232.5 1605 14.6 44
10 1950°F (1065°C) for 5 min. 97.9 675 163.0 1125 39.3 32
15 91.2 630 167.1 1150 43.8 30
20 96.5 665 170.7 1175 40.8 32
25 88.9 615 169.5 1170 44.3 32
10 2050°F (1120°C) for 5 min. 74.0 510 156.6 1080 53.4 27
15 78.6 540 161.2 1110 51.9 28
20 82.0 565 164.8 1135 47.6 31
25 82.9 570 165.6 1140 48.0 30
10 2150°F (1117°C) for 5 min. 66.9 460 148.1 1020 62.6 21
15 73.6 505 156.1 1075 55.4 26
20 72.1 495 154.0 1060 59.3 26
25 68.5 470 149.3 1030 61.7 25

*Based upon cold reductions taken upon 0.110-inch (2.8 mm) thick sheet. Duplicate tests.
HRC = Hardness Rockwell “C”.

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