Edgar I think Michael and I in total agreement. Michael sights 1008-1030 as low carbon steels which are not hardened. I state that plain steels with a carbon content of 0,4 and above can be hardened, anotherwords 1040-1095 can be hardened. The VH you note which had 0.35 carbon can be hardened but in order to harden it using only its own carbon you have to reach critical temperature (martensite) before you quench. I believe Parker added carbon to the surface and quenched at a lower temperature leaving the core soft.
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