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<p>[QUOTE=&quot;Conder101, post: 4396349, member: 66&quot;]Yes they are softer before the hubbing process.&nbsp; The hubbing work hardens them and they are the re-annealed to soften them again. (For steel alloy annealing involves heating them and then SLOWLY cooling them at a controlled rate.)&nbsp; After the hubbing is finished they are heat treated and rapidly quench cooling to to harden them.&nbsp; The annealing and hardening processes are more involved than I have described because how soft or hard the resulting material is depends on serveral variables including to what temperature they were heated, how long they were held at temperature, how slowly or rapidly they were cooled, for hardening what they were quenched in etc.&nbsp; And then after hardening there is also a tempering step to make sure the dies aren&#039;t too brittle.&nbsp; I understand the processes but I don&#039;t know the exact details, and those details will vary depending on the exact alloy of the steel used for the dies.&nbsp; That is more of a discussion for a metallurgist.[/QUOTE]</p><p><br /></p>

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