• TOOL STEEL - S7 / 1.2357 / 55NiCrMoV7
  • TOOL STEEL - S7 / 1.2357 / 55NiCrMoV7
  • S7 / 1.2357 / 55NiCrMoV7
  • S7 / 1.2357 / 55NiCrMoV7

S7 / 1.2357 / 55NiCrMoV7

S7 Steel Mechanical Properties:

S7 is a shock-resistant air hardening tool steel, designed for high impact resistance at relatively high hardness. It offers toughness to withstand chipping and breaking, combined with high attainable hardness and good wear resistance.

AISI S7 Chemical  Composition:

C Si Mn P S Cr Mo V
0.45-0.55 0.20-1.00 0.20-0.90 ≤ 0.030 ≤ 0.030 3.00-3.50 1.30-1.80 ≤ 0.35
  • Introduction

  • Heat Treatment

  • Applications

  • Equivalent Grade

  • AISI S7 Introduction:

    S7 is a general purpose air hardening tool steel having high impact and shock resistance. It has good resistance to softening at moderately high temperatures. This combination of properties makes it suitable for many hot-work and cold-work applications.


    1500°-1550°F, cool slowly to 1000°F, air cool. Brinell 197 max.


    1200°-1300°F, prior to hardening.


    1750°F. Quench in air if cross section is 2-1/2" or smaller; sections 2-1/2" to 6" should be oil quenched to black (1000°F) followed by air cooling to 150°F. Larger cross sections should be oil quenched to 150°F.


    Double temper one hour per inch of section thickness to desired heating rate of 2 hours per inch. Cool in air to room temperature between the two tempers. Suggested: Cold working applications 400°-500°F. Hot working applications 900°-1000°F.

  • S7 Steel Applications : 

    Typical applications for S7 tool steel are punches, chisels, blanking dies, forming dies, cold and warm header dies, shears, compression dies, hobbed dies, high hardness plastic molds, zinc die casting dies, gripper dies, etc.

  • S7 Equivalent Grade:

    1.2357 55NiCrMoV7


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