AISI S-1

Description

As a shock resisting steel it is suited for both hot and cold work applications. The tungsten content of this steel grade confers fatigue resistance, the chromium content provides depth of hardness and resistance to abrasion. It is suitable for cold work tools subject to heavy shock. 1.2550 is also used with great success for chisels and punches required for heavy work on hard and tough materials. Suitable for hot work applications where high fatigue strength with medium hot hardness is desirable. Tools made from this grade can be water cooled in service with minimal risk of cracking.

Equivalent Grades

American German Japanese China Poland
  (W.Nr) (DIN)      
AISI S-1 1.255060WCrV8---

Chemical Composition (AISI S-1)

  C Si Mn P S Cr Mo V W Co Ni
AISI S-1

Properties

Coefficient of thermal expansion at °C

20 – 100

20 – 200

20 – 300

20 – 400

20 – 500

20 – 600

20 – 700

10-6 m/(m • K)

11.9

12.9

13.3

13.6

14.1

14.4

14.7


Thermal    Conductivity at °C

20

350

700

W/(m • K)

34.3

32.8

31




Applications

  • Blanking dies for cutting sheets
  • Trimming and splitting dies
  • Cold piercing punches
  • Performing punches
  • Shear blades
  • Chipping knives
  • Pneumatic chisels
  • Coining tools
  • Cold shear blades
  • Ejectors



Heat Treatment

Soft annealing °C
Cooling
Hardness HB
700 – 740
Furnace
max. 230


Stress-relief annealing °C
Cooling
approx. 655
Furnace


Hardening °C
Quenching
Hardness after quenching HRC
875 – 910
Oil or saltbath, 180 – 220 °C

58


Tempering °C

100

200

300

400

500

600

HRC

58

56

54

50

46

41


Tempreing Curve: