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A detailed description

Is the low sulphur phosphorous composite free cutting steel, the cutting performance than the 30, steel, heat treatment process basic same, quenching cracking is a bit poor, or sensitive according to shape and complexity parts choose quenching medium. Used for manufacturing requirements of high strength of heat treatment, also can be used in the manufacture of standard heat-treated pieces. Y30 into small parts processing, quenching and tempering treatment in order to improve the life.

Had 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

P: more than 0.06 P

-vice mechanical properties:

Tensile strength sigma b (MPa) : (hot) 510 655; (cold pull) steel thickness or diameter 8 ~ 20:600 ~ 825; > 20 ~ 30:560 ~ 765; > at 30:540 ~ 735

Delta 5 (%) elongation hot rolling) acuity 15; : ( Cold rolling) acuity 6.0 (

Section (%) : (ψ shrinkage hot rolling) : 25

Hardness: (more than 187 HB hot rolling); (cold pull) 174 ~ 223 HB

Standard and metallographic organization took heat treatment:

Delivery status: hot rolling with miscalculates or cold pull state delivery, delivery status should be indicated in the contract.