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Chemical Compositions

GENERAL PURPOSE HIGH SPEED STEELS

Type Chemical Compositions
Hardness
Carbon Tungeston Molybdenum Chromimum Vanadium Rockwell Term
M1 0.80 1.50 8.00 4.00 1.00 63-65 "HSS"
M2 0.85 6.00 5.00 4.00 1.90 63-65 "HSS"
M7 1.00 1.75 8.75 4.00 2.00 63-65 "HSS"

COBALT HIGH SPEED DRILLS

Type Chemical Compositions
Hardness
Carbon Tungeston Molybdenum Chromimum Vanadium Cobalt Rockwell Term
M35 0.80 6.00 5.00 4.00 2.00 5.00 65-67 "5% Cobalt"
M42 1.10 1.50 9.50 3.75 1.15 8.00 65-67 "Super Cobalt"

MANUFACTURERS COMPARISONS

German German USA Japan
Grade DIN AISI JIN
Number
1.3202 S 12-1-4-5 T 15 SKH 57
1.3207 S 10-4-3-10 SKH 55
1.3243 S 6-5-2-5
1.3246 S 7-4-2-5 M 41 SKH 59
1.3247 S 2-10-1-8 M 42
1.3249 S 2-9-2-8 M 33/ M 34 SKH 3
1.3255 S 18-1-2-5 T 4 SKH 4
1.3265 S 18-1-2-10 T 5
1.3342 SC 6-5-2 M 2 SKH 51
1.3343 S 6-5-2 M 3
1.3344 S 6-5-3 M 3 Class2 SKH 52/ SKH 53
1.3348 S 2-9-2 M 7
1.3355 S 18-0-1 T 1 SKH 2