Home Forums General Discussion Media, Shot, Beads, etc. Questions about shot hardness and cost

What is the price difference between hard shot and
conventional shot? One research reports a two to one difference in fatigue life by using the hard shot peening approach.

Please note these comments are relevant for cast steel shot and not intended to include cut wire peening shot.

1. For aerospace peening applications the term hard shot has come to mean 55-62 HRC per AMS 2431 /2D. To follow, regular or conventional aerospace shot hardness is 45-52 HRC.

2. For this specification, the price is the same for either hardness.

3. The fatigue life difference between these two hardness options is about 15% for the smaller sizes of shot like S-70 or S-110 and 20-30% as the shot sizes increase. I am not familiar with the research report mentioned.

4. For peening applications other than AMS 2431, a range of shot hardness options is available, and application dependent.

5. The SAE shot hardness standard is 40-51 HRC. Any other hardness option for SAE will usually require a process and price premium of 6-10%.

[NOTE: above comments are from a friend of mine in the media supply industry]