Regarding the low impact requirements for 16Mn forgings at -20°C
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Question: When performing low-temperature impact testing on 16Mn forgings at -20°C, what value should be used for the impact energy? NB/T47008 only provides the impact energy value at 0°C; where can I find the value at -20°C?
Can -20°C be treated as 0°C? I just saw that for NB/T47008, the 2010 version specifies 34J, while the 2017 version specifies 41J
This post was last edited by zjq1962 on 2018-5-24 10:56. Yes, the indicator is still set at 0 degrees.
According to NB/T47009, the value at -40°C is not less than 47 J; according to NB/T47008, the value at 0°C is not less than 41 J. Based on this, I think 47 J should be chosen
The impact temperature decreases, while the impact value remains unchanged
It is a 16Mn forging, not a 16MnD forging; the former is governed by NB/T47008, while the latter is governed by NB/T47009