Heat Treating Tool Steels Manufacturing Table Chart

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Heat Treating Tool Steels Manufacturing Table Chart

 
 
Hardening
 
 
Preheat
temperature
Hardening
temperature
Time at
Quenching
Tempering
temperature
Type
Rate of heating
°C
°F
°C
°F
temp, min
medium (a)
°C
°F
Molybdenum high-speed steels
M1,M7,
M10
Rapidly from preheat
730-845
1350-1550
1175-1220
2150-2225(b)
2-5
O, A or S
540-595(c)
1000-1100(c)
M2
Rapidly from preheat
730-845
1350-1550
1190-1230
2175-2250(b)
2-5
O, A or S
540-595(c)
1000-1100(c)
M3, M4,
M30, M33,
M34
Rapidly from
preheat
 
730-845
 
 
1350-1550
 
 
1205
1230(b)
 
2200-
2250(b)
 
2-5
 
 
O, A or S
 
 
540-595(c)
 
 
1000
1100(c)
 
M6
Rapidly from preheat
790
1450
1175-1205(b)
2150-2200(b)
2-5
O, A or S
540-595(c)
1000-1100(c)
M36
Rapidly from preheat
730-845
1350-1550
1200-1245(b)
2225-2275(b)
2-5
O, A or S
540-595(c)
1000-1100(c)
M41
Rapidly from preheat
730-845
1350-1550
1190-1215(b)
2175-2220(b)
2-5
O, A or S
540-595(c)
1000-1100(d)
M42
 
Rapidly from
preheat
730-845
 
1350-1550
 
1190
1210(b)
2175-
2210(b)
2-5
 
O, A or S
 
510
595(d)
950
1100(d)
M43
 
Rapidly from
preheat
730-845
 
1350-1550
 
1190
1215(b)
2175-
2220(b)
2-5
 
O, A or S
 
510
595(d)
950
1100(d)
M44
Rapidly from preheat
730-845
1350-1550
1200-1225(b)
2190-2240(b)
2-5
O, A or S
540-625(d)
1000-1160(d)
M46
Rapidly from preheat
730-845
1350-1550
1190-1220(b)
2175-2225(b)
2-5
O, A or S
525-565(d)
975-1050(d)
M47
Rapidly from preheat
730-845
1350-1550
1180-1205(b)
2150-2200(b)
2-5
O, A or S
525-595(d)
975-1100(d)
Tungsten high-speed steels 
T1, T2,
T4,T8
Rapidly from preheat
815-870
 
1500-1600
 
1260-
1300(b)
2300-
2375(b)
2-5
 
O, A or S
 
540-595(c)
 
1000-
1100(c)
T5, T6
Rapidly from preheat
815-870
1500-1600
1275-1300(b)
2325-2375(b)
2-5
O, A or S
540-595(c)
1000-1100(c)
T15
Rapidly from preheat
815-870
1500-1600
1205-1260(b)
2200-2300(b)
2-5
O, A or S
540-650(d)
1000-1200(d)
Chromium hot-work steels 
H10
Moderately from preheat
815
1500
1010-1040
18501900
15-40(e)
A
540-650
10001200
H11, H12
Moderately from preheat
815
1500
995-1025
18251875
15-40(e)
A
540-650
10001200
H13
Moderately from preheat
815
1500
995-1040
18251900
15-40(e)
A
540-650
10001200
H14
Moderately from preheat
815
1500
1010-1065
18501950
15-40(e)
A
540-650
10001200
H19
Moderately from preheat
815
1500
1095-1205
20002200
2-5
A or O
540-705
10001300
Molybdenum hot work steels
H41, H43
Rapidly from preheat
730-845
1350-1550
1095-1190
20002175
2-5
O, A or S
565-650
10501200
H42
Rapidly from preheat
730-845
1350-1550
1120-1220
20502225
2-5
O, A or S
565-650
10501200
Tungsten hot work steels
H21, H22
Rapidly from preheat
815
1500
1095-1205
20002200
2-5
A or O
595-675
11001250
H23
Rapidly from preheat
845
1550
1205-1260
22002300
2-5
O, A or S
650-815
12001500
H24
Rapidly from preheat
815
1500
1095-1230
20002250
2-5
O, A or S
565-650
10501200
H25
Rapidly from preheat
815
1500
1150-1260
21002300
2-5
A or O
565-675
10501250
H26
Rapidly from preheat
870
1600
1175-1260
21502300
2-5
O, A or S
565-675
10501250
Medium-alloy air-hardening cold work steels
A2
Slowly
790
1450
925-980
17001800
20-45
A
175-540
3501000
A3
Slowly
790
1450
955-980
17501800
25-60
A
175-540
3501000
A4
Slowly
675
1250
815-870
15001600
20-45
A
175-425
350-800
A6
Slowly
650
1200
830-870
15251600
20-45
A
150-425
300-800
A7
Very slowly
815
1500
955-980
17501800
30-60
A
150-540
3001000
A8
Slowly
790
1450
980-1010
18001850
20-45
A
175-595
3501100
A9
Slowly
790
1450
980-1025
18001875
20-45
A
510-620
9501150
A10
Slowly
650
1200
790-815
14501500
30-60
A
175-425
350-800
Oil-hardening cold work steels
O1
Slowly
650
1200
790-815
14501500
10-30
O
175-260
350-500
O2
Slowly
650
1200
760-800
14001475
5-20
O
175-260
350-500
O6
Slowly
-
-
790-815
14501500
10-30
O
175-315
350-600
O7
 
Slowly
650
1200
790-830
14501525
10-30
O or W
175-290
350-550
 
 
 
845-885
15501625
 
 
 
 
Shock-resisting steels
S1
Slowly
-
-
900-955
16501750
15-45
O
205-650
4001200
S2
Slowly
650(f)
1200(f)
845-900
15501650
5-20
B or W
175-425
350-800
S5
Slowly
760
1400
870-925
16001700
5-20
O
175-425
350-800
S7
Slowly
650-705
1200-1300
925-955
17001750
15-45
A or O
205-620
4001150
Mold steels
P2
 
900-925(g)
1650-1700(g)
830-845(h)
1525-1550(h)
15
O
175-260
350-500
P3
 
900-925(g)
1650-1700(g)
800-830(h)
1475-1525(h)
15
O
175-260
350-500
P4
 
900-925(g)
1775-1825(g)
970-995(h)
1775-1825(h)
15
A or O
175-480
350-900
P5
 
900-925(g)
1650-1700(g)
845-870(h)
1550-1600(h)
15
O or W
175-260
350-500
P6
 
900-925(g)
1650-1700(g)
790-815(h)
1450-1500(h)
15
A or O
175-230
350-450
P20
-
870-900(h)
1600-1650(h)
815-870
15001600
15
O
480-595(i)
900-1100(i)
P21(j)
Slowly
Do not preheat
 
705-730
13001350
60-180
A or O
510-550
9501025
Low-alloy special-purpose steels
L2
 
 
 
 
 
Slowly
-
-
W: 790-845
W: 1450-1550
10-30
O or W
175-540
350-1000
 
 
 
O: 845-925
O: 1550-1700
 
 
 
 
L3
Slowly
-
-
W: 775-815
W: 1425-1500
10-30
O or W
175-315
350-600
 
 
 
 
O: 815-870
O: 1500-1600
 
 
 
 
L6
Slowly
-
-
790-845
1450-1550
10-30
O
175-540
350-1000
Carbon-tungsten special-purpose steels
F1, F2
Slowly
650
1200
790-870
14501600
15
W or B
175-260
350-500
Water-hardening steels
W1, W2, W3
Slowly
565-650(k)
1050-1200(k)
760-815
14001550
10-30
B or W
175-345
350-650
High-carbon, high-chromium cold work steels
D1, D5
Very Slowly
815
1500
980-1025
18001875
15-45
A
205-540
4001000
D3
Very Slowly
815
1500
925-980
17001800
15-45
O
205-540
4001000
D4
Very Slowly
815
1500
970-1010
17751850
15-45
A
205-540
4001000
D7
Very Slowly
815
1500
1010-1065
18501950
30-60
A
150-540
3001000

Notes:

(a)O, oil quench; A, air cool; S, salt bath quench; W, water quench; B, brine quench.
(b) When the high-temperature heating is carried out in a salt bath, the range of temperatures should be about 15ºC (25ºF) lower than given in this line.
(c) Double tempering recommended for not less than 1 h at temperat
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