Table 9. Cold-Work Tool Steels Identifying Chemical Composition and Typical Heat-Treatment Data
High-Carbon, High-Chromium Types
Group Types
Medium-Alloy, Air-Hardening Types
Oil-Hardening Types
AISI
D2 D3 D4 D5 D7 A2 A3 A4 A6 A7 A8 A9 A10 O1 O2 O6 O7 1.50 2.25 2.25 1.50 2.35 1.00 1.25 1.00 0.70 2.25 0.55 0.50 1.35 0.90 0.90 1.45 1.20 … … … … … … … 2.002.00 … … … 1.801.001.60 … … ………………………………1.25……1.00… … … … … … … … … …1.001.25… …0.50… …1.75 1.00 … 1.00 1.00 1.00 1.00 1.00 1.00 1.25 1.00 1.25 1.40 1.50 … … 0.25 … 12.00 12.00 12.00 12.00 12.00 5.00 5.00 1.00 1.00 5.25 5.00 5.00 … 0.50 … … 0.75 1.00… … …4.00…1.00… …4.75…1.00… … … … … ………3.00………………………………… ……………………………1.501.80…………
C
Mn
Si W
Identifying Chemical Elements in Percent
Mo Cr Co Ni V
1700– 1800 927– 982
1775– 1850 968– 1010
1800– 1875 982– 1024
1850– 1950 1010– 1066
1700– 1800 927– 982
1750– 1850 954– 1010
1500– 1600 816– 871
1525– 1600 829– 871
1750– 1800 954– 982
1800– 1850 982– 1010
1800– 1875 982– 1024
1450– 1500 788– 816
1450– 1500 788– 816
1400– 1475 760– 802
1450– 1500 788– 816
1550– 1525 843– 829
° F 1800– 1875 ° C 982– 1024 ° F 400– 1000 ° C 204– 538
Hardening Temperature Range
Heat-Treatment Data
Quenching Medium Air
Oil
Air
Air
Air
Air
Air
Air
Air
Air
Air
Air
Air
Oil
Oil
Oil
Oil
400– 1000 204– 538
400– 1000 204– 538
400– 1000 204– 538
300– 1000 149– 538
350– 1000 177– 538
350– 1000 177– 538
350– 800 177– 427
300– 800 149– 427
300– 1000 149– 538
350– 1100 177– 593
950– 1150 510– 621
350– 800 177– 427
350– 500 177– 260
350– 500 177– 260
350– 600 177– 316
350– 550 177– 288
Tempering Temperature Range
Approx. Tempered Hardness, RC (Rockwell C scale)
61–54 61–54 61–54 61–54 65–58 62–57 65–57 62–54 60–54 67–57 60–50 56–35 62–55 62–57 62–57 63–58 64–58 Relative Ratings of Properties (A = greatest to E = least) ACAAAAAAAAAAABBBB AAAAAAAAAAAAABBBB BBBBBBBA/BA/BBBBA/BAAAA ABAAAAAAAAAAABBBB EEEEEDDD/ED/EEDDC/DCCBC CCCCCCCDDCCCDEEEE B/CB BB/CA C BC/DC/DAC/DC/DC D D D D EEEEEDDDDECCDDDDC
Safety in Hardening Depth of Hardening Resistance to Decarburization Stability of Shape in Heat Treatment Machinability Hot Hardness Wear Resistance
Characteristics in Heat Treatment
Service Properties
Toughness
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