Steel 1035 cross-references to DIN Ck35, a killed, fine-grain variant of the same 0.32–0.38% carbon family as standard C35 but produced with tighter deoxidation control and a defined silicon addition (roughly 0.15–0.30%). That extra processing control gives Ck35 a cleaner, more consistent microstructure than a rimmed or semi-killed equivalent, which pays off in more predictable heat-treat response and more uniform mechanical properties from batch to batch.

Like other grades in the 1035 family, this is a medium-carbon steel that balances strength, ductility, and machinability well enough for a broad range of shafts, bolts, gears, and general mechanical components. The manganese content (0.60–0.90%) adds a modest hardenability boost, and because the carbon level is high enough to respond to heat treatment, Ck35 can be supplied normalized for straightforward machining or quenched and tempered afterward when a finished part needs higher strength or wear resistance than the normalized condition delivers.

Ck35's carbon content puts it in the same reasonably free-cutting range as the rest of the 1035 family, and in the normalized or annealed condition it machines with moderate, predictable cutting forces and good chip formation using standard carbide tooling. The silicon addition and cleaner deoxidation practice used to produce Ck35 don't change the cutting mechanics much on their own, but the more consistent grain structure tends to translate into steadier tool wear across a batch compared with less tightly controlled steel.

As with any grade in this carbon range, hardness rises quickly once the part is quenched and tempered, and that rise drives up cutting forces, flank wear, and heat at the cutting edge. It's worth confirming whether the stock in front of you is in the normalized or the heat-treated condition before locking in a cutting speed, since parameters tuned for soft, normalized material will wear a tool out fast against tempered stock.

Light or hesitant cuts can still work-harden the surface on this material, so keeping the edge engaged with a steady feed, using rigid workholding, and matching coolant to the operation all help maintain consistent tool life and surface finish through a run.