UNS #T41902

S2 is a water hardening tool steel possessing extreme toughness, bending before it breaks even at Rockwell C 59/60. When hardened in medium and large size sections, S2 develops a hard case and a tough core. The combination of extreme toughness, hardness and wear resistance makes it suitable for use in many applications that require extreme toughness, must not break, and where other tool steels will not perform.

Type Analysis

  • Carbon (Nominal) 0.5
  • Silicon (Maximum) 1
  • Manganese (Maximum) 0.4
  • Molybdenum (Nominal) 0.5
  • Iron (Nominal) Balance


Punches Knock-out pins Clutch pins Indexing pins Trimming dies Crimping dies Swaging dies Wrenches Fingers Shear blades Heavy-duty forming tools Heavy-duty coining dies Special knurls Stamps Jaws CarTech S2 tool steel has also found application in "battering tools," such as: Pneumatic chisels Vanstoning dies Concrete breakers Caulking tools Rivet busters Beading tools Track chisels Pipe cutter wheels Screw drivers Rivet sets

Applicable Specifications

  • ASTM A681
  • QQ-T-570





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