High Speed Steel

HIGH SPEED steels have been named to show their ability to resist softening at elevated temperatures therefore maintaining a sharp cutting edge when cuts are heavy and speeds are high. They are the most highly alloyed of all of the tool steel types. They normally contain comparatively large amounts of tungsten or molybdenum, chromium, Cobalt and vanadium, along with carbon.



Two groups are available: Molybdenum Types and Tungsten Types

THE MOLYBDENUM high speed tool steels contain 3.50 to 9.50% molybdenum. They characteristically contain 4.00% tungsten, and 1.00 to 5.00% vanadium. Carbon is fairly high—0.80 to 1.50%. Applications cover a wide range of cutting tools. Examples include these: twist drills, reamers, milling cutters, lathe and planer tools, cutoff knives, and insert cutter blades.

THE TUNGSTEN high speed tool steels have 12.00 to 20.00% tungsten. They also have substantial amounts of chromium and vanadium, and some have considerable amounts of cobalt. Carbon is high—0.70 to 1.50%, depending on the grade. Tooling uses include bits, drills, reamers, taps, broaches, milling cutters, hobs, punches, and dies.

Characterised by the following properties, among other things:

  • Very good wear resistance
  • High pressure resistance
  • Great toughness

STANDARD STOCK GRADES & COMPARABLE STANDARDS

EST GB (CHINA) DIN ASTM JIS OTHER
DF6 W6Mo5Cr4V2 1.3343 M2 SKH51  
DF6Co          
DF6M          
DF18 W18Cr4V 1.3355 T1 SHK2  
DF35 W6Mo5Cr4V2Co5 1.3243 M35 SKH55  
DF42 W2Mo9Cr4VCo8 1.3247 M42 SKH59  

STANDARD STOCK SIZES

PRODUCT DELIVERY CONDITION AND AVAILABLE DIMENSIONS
ROUND COLD DRAWN CENTERLESS GROUND PEELED TURNED
DIAMETER IN MM 2.50 - 12.0 8.5 - 30.0 16 - 75 75 - 205
SQUARE HOT ROLLED BLACK FORGED ALL SIDE MILLED
SIZE IN MM 7.5 X 7.5 - 50.0 X 50.0 55 X 55 - 180 X 180
FLATS HOT ROLLED BLACK HOT ROLLED, 2 EDGE MILLED FORGED ALL SIDE MILLED
THICK x WIDTH IN MM 6 - 30 X 20 - 130 13 - 80 X 150 - 410 90 - 130 X 100 - 410
SHEET COLD ROLLED HOT ROLLED
THICK x WIDTH xLENGTH IN MM 1.0 - 2.5 X 600 - 800 X 1500 - 2000 2.60 - 10 X 600 - 800 X 1500 - 2000