Experts,
Used to work with small diameter (<10'' OD) low alloy carbon steel tubing and casing and now deal with big diameter bar stocks. Got a question on a MTR of 4330V I received today:
The heat treatment process of this heat of material, 11'' OD:
Hardened 1600F 7.0 Hours Oil Quenched
Tempered 1100F 11.0 Hours Air Cooled
I am surprised by those durations! I know it is 11.0 in. OD, but still wondering if they are too long. 7 hours for austenitizing and 11 hours for tempering? I assume they are the holding times, not including heating time. Will 7 hours Austenitizing blow up grain size like crazy? BTW, the final yield strength is 150ksi. Thanks for all coments in advance.
Used to work with small diameter (<10'' OD) low alloy carbon steel tubing and casing and now deal with big diameter bar stocks. Got a question on a MTR of 4330V I received today:
The heat treatment process of this heat of material, 11'' OD:
Hardened 1600F 7.0 Hours Oil Quenched
Tempered 1100F 11.0 Hours Air Cooled
I am surprised by those durations! I know it is 11.0 in. OD, but still wondering if they are too long. 7 hours for austenitizing and 11 hours for tempering? I assume they are the holding times, not including heating time. Will 7 hours Austenitizing blow up grain size like crazy? BTW, the final yield strength is 150ksi. Thanks for all coments in advance.