35S20 (1.0726) cutting steel

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     ● Features and application:
     Low parathion composite free cutting steel, the cutting is better than 30 steel, heat treatment process is basically the same, equal to or somewhat less sensitive to quenching crack, according to the part shape, the complexity of the selected quenching media. Requirements for the manufacture of high strength non-heat treated standard parts can also be used to make heat treatment. Y30 processed into small parts, can be quenched in order to improve life.
     ● Chemical Composition:
     Carbon C: 0.27 ~ 0.35
     Si Si: 0.15 ~ 0.35
     Manganese Mn: 0.70 ~ 1.00
     Sulfur S: 0.08 ~ 0.15
     Phosphorus P: ≤ 0.06
     ● Mechanical Properties:
     Tensile strength σb (MPa): (hot) 510 - 655; (cold drawn) steel thickness or diameter of 8 to 20 hours: 600 ~ 825;> 20 to 30 hours: 560 ~ 765;> 30 hours: 540 ~ 735
     Elongation δ5 (%):( hot) ≥ 15; (cold) ≥ 6.0
     Reduction of ψ (%):( hot) ≥ 25
     Hardness: (hot) ≤ 187HB; (cold drawing) 174 ~ 223HB
     ● Heat treatment and microstructure specifications:
     ● Delivery status: the hot-rolled or cold-drawn state of delivery, delivery status should be indicated in the contract.