UNS S17400 ASTM A564
UNS S17400 ASTM A564
(OP)
A customer has his own specification of the above material which shows mechanical properties above H1150M and below H1150D condition.
In the past the heat treatment for H1150M condition has always been :-
Soln Treat @ 1040C Water Quench followed by 760C held for 2 hrs air cool followed by 620 C for 4 hrs air cool.
H1150D condition is:-
Soln Treat @ 1040C Water Quench followed by 620C held for 4 hrs air cool followed by 620 C for 4 hrs air cool.
Can these temperatures/times be varied in some way to give properties between 1150M & 1150D?
In the past the heat treatment for H1150M condition has always been :-
Soln Treat @ 1040C Water Quench followed by 760C held for 2 hrs air cool followed by 620 C for 4 hrs air cool.
H1150D condition is:-
Soln Treat @ 1040C Water Quench followed by 620C held for 4 hrs air cool followed by 620 C for 4 hrs air cool.
Can these temperatures/times be varied in some way to give properties between 1150M & 1150D?





RE: UNS S17400 ASTM A564
does the H2250 have enough elongation? if so then stick with it.
If the spec has min/max properties then ask for the heat treatment.
Longer aging at 1150F will reduce strength, but I don't know how much.
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Plymouth Tube
RE: UNS S17400 ASTM A564
If this material is being supplied to this ASTM specification, the answer is NO for Type 630 (UNS S17400).
RE: UNS S17400 ASTM A564
RE: UNS S17400 ASTM A564
You really have no clue what the toughness, fatigue, stress rupture and so on actually are. In some of these alloys you can drive down the toughness without changing the tensile.
You might see this in tensile elongation, but you might not.
I would not try to make up a new heat treatment. I would select a standard one that will result in properties that meet my requirement. If there isn't one then look into using another alloy.
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Plymouth Tube