Spec1

MIL-C-26074

Requirement Callout
350-400°F for 3+ hr embrittlement only for steel > Rockwell C40 no treatment for other material Class 1
550 °F for 2+ hr 650 °F for 1-1.5 hr hardness must be > 800 HK100 Class 2
360 to 390°F for 1-1.5 hr for non heat-treatable aluminum Class 3
240 to 260°F for 1-1.5 hr for heat-treatable aluminum Class 4
1.0 mil minimum thickness Grade A
0.5 mil minimum thickness Grade B
1.5 mil minimum thickness Grade C

AMS2404

Requirement Callout
350-400°F for 3+ hr embrittlement only for steel > Rockwell C40 no treatment for other material Class 1
450 °F for 4+ hr hardness must be > 800 HK100 Class 2
360 to 390°F for 1-1.5 hr adhesion non heat-treatable aluminum Class 3
240 to 260°F for 1-1.5 hr adhesion heat-treatable aluminum Class 4
1-13% phosphorus by weight All Classes

ASTM-B-733

Requirement Callout
xxx% phosphorus Type I
1-3% phosphorus Type II
2-4% phosphorus Type III
5-9% phosphorus Type IV
No heat treatment Class 1
260 to 400°C for 2-4 hr hardness must be > 850 HK100 Class 2
180 to 200°C for 1 hr min embrittlement bake for steels Class 3
120 to 130°C for 1 hr min for heat-treatable alloys Class 4
140 to 150°C for 1 hr min for non heat-treatable alloys Class 5
300 to 320°C for 1 hr min adhesion bake for titanium alloys Class 6