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HAYNES® Alloys

Fabrication Characteristics

Heat Treatment

HAYNES® 188 alloy is normally solution heat treated in the range of 2125-2175°F for a time to commensurate with section thickness. Annealing during fabrication can be performed at even lower temperatures, but a final, subsequent solution heat treatment is needed to produce optimum properties and structure.

Effect of Cold Reduction Upon Room-Temperature Properties*

Cold Reduction Subsequent Temperature 0.2% Yield Strength Ultimate Tensile Strength Elongation Hardness
% - ksi MPa ksi MPa % HR B/C
0 NONE 66.9 460 137.2 945 54.2 98.1 HRB
10 105.9 730 151.5 1045 45.1 32.1 HRC
20 132.9 915 165.9 1145 28.3 37.1 HRC
30 167.0 1150 195.1 1345 13.4 41.2 HRC
40 176.8 1220 214.9 1480 9.8 43.5 HRC
10 1950°F (1065°C) For 5 min. 91.2 630 148.5 1025 41.4 29.7 HRC
20 87.8 605 153.3 1055 41.0 27.8 HRC
30 84.2 580 158.3 1090 41.3 29.6 HRC
40 90.8 625 162.7 1120 39.8 31.1 HRC
10 2050°F (1120°C) For 5 min. 64.7 445 143.0 985 50.1 21.9 HRC
20 71.4 490 149.0 1025 47.2 24.5 HRC
30 80.3 555 155.2 1070 43.7 27.6 HRC
40 86.9 600 159.0 1095 43.2 29.5 HRC
10 2150°F (1175°C) For 5 min. 61.9 425 139.6 965 55.3 95.6 HRB
20 64.9 445 141.3 975 53.3 97.1 HRB
30 66.5 460 142.8 985 51.8 98.5 HRB
40 64.1 440 141.5 975 55.5 97.2 HRB

*Based upon rolling reduction taken upon 0.125 in. (3.2 mm) thick sheet. Duplicate tests.
HRB = Hardness Rockwell “B”
HRC = Hardness Rockwell “C”

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