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Heat Treatment of 3½ Nickel Casting ~ ASTM A352-LC3

thread330-463909

Heat Treatment of 3½ Nickel Casting ~ ASTM A352-LC3

Heat Treatment of 3½ Nickel Casting ~ ASTM A352-LC3

(OP)
The large casting (size and shape of a standard dumpster) heavy section (2~3") undergoes soaking at 1635°F, followed by quenching 'to below 300°C (572°F)'. ASTM A352 offers zero specific instructions for any of the grades it describes.

My experience with welding of ferritic steels with substantial amounts of nickel alloy tells me that 300°C may be insufficiently low to ensure complete martensite transformation.

Anyone have better knowledge or actual experience with this alloy steel? Thanks in advance!

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Heat Treatment of 3½ Nickel Casting ~ ASTM A352-LC3

I do not have direct experience on this alloy, but would expect non-100% martensite when cooing to 572F. Low carbon helps to increase Ms and Mf, but Ni decreases transformation temperature very effectively. 3-4% Ni can decrease Ms by 300-400F!

RE: Heat Treatment of 3½ Nickel Casting ~ ASTM A352-LC3

Our quench times for everything including LC3 were long enough so that the load would come out of the tank well below 300°C. We never put an exact temperature maximum as quenched temperature. If the load came out of the tank and steamed the instruction was to put it back in until the parts were cool enough to comfortably touch.

Bob

RE: Heat Treatment of 3½ Nickel Casting ~ ASTM A352-LC3

(OP)
'not steaming' means < 100°C
'comfortably touch' means < 60°C

both of which are a lot lower than 300°C

Thanks Bob!

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