AISI - S7

Description


Equivalent Grades

American German Japanese China Poland
  (W.Nr) (DIN)      
AISI - S7 1.235550CrMoV13-15---

Chemical Composition (AISI - S7)

  C Si Mn P S Cr Mo V W Co Ni
AISI - S7

Properties

  1. High Impact Resistance
  2. Excellent Toughness at high Strength levels
  3. Good Wear Resistance
  4. High Hardenability & Softening Resistance



Applications

  1. For Tools with Good Resistance to Impact and Softening
  2. Forging Dies
  3. Punches
  4. Chisels
  5. Hammer
  6. Hot Heading Dies
  7. Gripper Dies
  8. Shear Blades



Heat Treatment

  1. Annealing—Heating slowly and uniformly to 815~845℃, furnace cooling to 510℃ at a rate 8~15℃/hr. Hardness max. HB 229
  2. Stress Relieving — Warming to 650℃, furnace cooling.
  3. Hardening—                                                                                                                                                                                                                                                                                             Preheating: Warming to approx. 650~700℃, holding 20 minutes per 25 mm.                                                                                                                                                    Austenitizing: Heating to approx. 925~960℃, holding 20 minutes per 25 mm.                                                                                                                                                                          Quenchant: By oil
  4. Tempering—150~200℃, holding 30 minutes per 25 mm. Air-cooling.

               Hardness min. HRC 56

Tempreing Curve: