Table 6. Molybdenum High-Speed Steels Identifying Chemical Composition and Typical Heat-Treatment Data
M3 Cl. 2 M4 M6 M7 M10 M30 M33 M34 M36 M41 M42 M43 M44 M46 M47
AISI Type
M1 M2 M3 Cl. 1
0.85 1.00 0.80 0.90 0.90 0.80 1.10 1.10 1.20 1.15 1.25 1.10
C
0.80 0.85 1.00 1.05 1.20 1.30 0.80 1.00
Identifying Chemical Elements in Percent
W
1.50 6.00 6.00 6.00 5.50 4.00 1.75 … 2.00 1.50 2.00 6.00 6.75 1.50 2.75 5.25 2.00 1.50 8.00 5.00 5.00 5.00 4.50 5.00 8.75 8.00 8.00 9.50 8.00 5.00 3.75 9.50 8.00 6.25 8.25 9.50 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.25 3.75 3.75 4.25 4.00 3.75 1.00 2.00 2.40 3.00 4.00 1.50 2.00 2.00 1.25 1.15 2.00 2.00 2.00 1.15 1.60 2.25 3.20 1.25 … … … … … 12.00 … … 5.00 8.00 8.00 8.00 5.00 8.00 8.25 12.00 8.25 5.00
Mo
Cr
V
Co
2175– 2225 1191– 1218 1000– 1160 538– 627
2200– 2250 1204– 1232 1000– 1100 538– 593
2200– 2250 1204– 1232 1000– 1100 538– 593
2200– 2250 1204– 1232 1000– 1100 538– 593
2150– 2200 1177– 1204 1000– 1100 538– 593
2150– 2225 1177– 1218 1000– 1100 538– 593
2150– 2225 1177– 1218 1000– 1100 538– 593
2200– 2250 1204– 1232 1000– 1100 538– 593
2200– 2250 1204– 1232 1000– 1100 538– 593
2200– 2250 1204– 1232 1000– 1100 538– 593
2225– 2275 1218– 1246 1000– 1100 538– 593
2175– 2220 1191– 1216 1000– 1100 538– 593
2175– 2210 1191– 1210 950– 1100 510– 593
2175– 2220 1191– 1216 950– 1100 510– 593
2190– 2240 1199– 1227 1000– 1160 538– 627
2175– 2225 1191– 1218 975– 1050 524– 566
2150– 2200 1177– 1204 975– 1100 524– 594
° F 2150– 2225 ° C 1177– 1218 ° F 1000– 1100 ° C 538– 593
Hardening Temperature Range
Heat- Treatment Data
Tempering Temperature Range
Approx. Tempered Hardness, RC (Rockwell C scale)
65–60 65–60 66–61 66–61 66–61 66–61 66–61 65–60 65–60 65–60 65–60 65–60 70–65 70–65 70–65 70–62 69–67 70–65 Relative Ratings of Properties (A = greatest to E = least) DDDDDDDDDDDDDDDDDD
Safety in Hardening Depth of Hardening
AAAAAAAAAAAAAAAAAA Resistance to Decarburization C B B B B C C C C C C C C C C C C C Stability of Shape in Heat Treatment Quench ing Medium Air or Salt CCCCCCCCCCCCCCCCCC Oil DDDDDDDDDDDDDDDDDD
Characteristics in Heat Treatment
Machinability Hot Hardness Wear Resistance
DDDD/EDDDDDDDDDDDDDD BBBBBABBAAAAAAAAAA BBBBABBBBBBBBBBBBB EEEEEEEEEEEEEEEEEE
Service Properties
Toughness
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