Questions about heat treating spring steel AISI 6150 3

[slashragnarok]

Hi,

Currently I am attempting to build myself a piece of weightlifting equipment (a barbell) and have settled on building the main shaft with 2200mm long 29mm dia 6150 spring steel. My dad's friend has offered to heat treat it for me for no charge. But he has asked me to provide him details of the temperatures and time for quenching and subsequent tempering as he has no experience HTing 6150. I tried pulling some data from the ASM Specialty Handbook for Tool Materials. Please help. Can I use that data?

 

[slashragnarok]

I found out that the knurl depth is directly related by the TPI of the knurl which is again dictated by the bar diameter. So on a 28.5mm bar a 20 TPI knurl would be used to prevent double tracking. So the knurling depth is not really something I can control.