Table 8. Hot-Work Tool Steels Identifying Chemical Composition and Typical Heat-Treatment Data
AISI
Group
Chromium Types
Tungsten Types
Molybdenum Types
Type
H10 H11 H12 H13 H14 H19 H21 H22 H23 H24 H25 H26 H41 H42 H43 0.40 0.35 0.35 0.35 0.40 0.40 0.35 0.35 0.35 0.45 0.25 0.50 0.65 0.60 0.55 … … 1.50 … 5.00 4.25 9.00 11.00 12.00 15.00 15.00 18.00 1.50 6.00 … 2.50 1.50 1.50 1.50 … … … … … … … … 8.00 5.00 8.00 3.25 5.00 5.00 5.00 5.00 4.25 3.50 2.00 12.00 3.00 4.00 4.00 4.00 4.00 4.00 0.40 0.40 0.40 1.00 … 2.00 … … … … … 1.00 1.00 2.00 2.00 ……………4.25………………………
C
W
Identifying Chemical Elements in Percent
Mo
Cr
V
Co
Hardening Temperature Range
1850– 1900
1825– 1875 996– 1024 1000– 1200
1825– 1875 996– 1024 1000– 1200
1825– 1900 996– 1038 1000– 1200
1850– 1950 1010– 1066 1100– 1200
2000– 2200 1093– 1204 1000– 1300
2000– 2200 1093– 1204 1100– 1250
2000– 2200 1093– 1204 1100– 1250
2000– 2300 1093– 1260 1200– 1500
2000– 2250 1093– 1232 1050– 1200
2100– 2300 1149– 1260 1050– 1250
2150– 2300 1177– 1260 1050– 1250
2000– 2175 1093– 1191 1050– 1200
2050– 2225 1121– 1218 1050– 1200
2000– 2175 1093– 1191 1050– 1200
° F
° C 1010– 1038
Tempering Temperature Range
1000– 1200
Heat-Treatment Data
° F
538– 649
538– 649
538– 649
593– 649
538– 704
593– 677
593– 677
649– 816
566– 649
566– 677
566– 677
566– 649
566– 649
566– 649
° C 538– 649
Approx. Tempered Hardness, RC (Rockwell C scale)
56–39 54–38 55–38 53–38 47–40 59–40 54–36 52–39 47–30 55–45 44–35 58–43 60–50 60–50 58–45 Relative Ratings of Properties (A = greatest to D = least) AAAAABBBBBBBCCC AAAAAAAAAAAAAAA
Safety in Hardening Depth of Hardening
Resistance to Decarburization
BBBBBBBBBBBBCBC Air or Salt BBBBCCCC…CCCCCC Oil ……………DDDDDDDDDD C/DC/DC/DC/DD D D D D D D D D D D CCCCCCCCBBBBBBB D D D D DC/DC/DC/DC/DC D C C C C CBBBCCCCDDCDDDD
Characteristics in Heat Treatment
Stability of Shape in Heat Treatment
Quenching Medium
Machinability Hot Hardness Wear Resistance
Service Properties
Toughness
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