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Non-alloy steel, quenchable and temperable in water and oil. Pieces of a particular size with sufficiently transformed structures can be extracted. It is one of the most used steels in Europe.
KV20 R20Pb
KV30 R30S
KV35 R35Pb
KV40 R40S R40Pb
KV50 R50Pb
R55
RE60S