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Detroit Flame Hardening - Materials
The degree of hardness depends on the chemical analysis of the material, with carbon being the principal controlling element. When heating and quenching rates are accurately controlled, any ferrous material, which can be furnace hardened, can be flame hardened to a higher degree of hardness.
In choosing a material, availability, cost, hardness desired and machine-ability are factors to consider. Our technical staff can advise you and discuss specific applications.
Tables:
| Effects of flame hardening on steels |
| Hardness range of plain carbon steels |
| Typical hardness curve for flame hardened medium carbon steels |
| Metal hardness conversion numbers (approximate) |
Effects of flame hardening on steels
| Steel/Iron Type |
Hardness, Rockwell C |
1020 mid steel
8620 carburized
1045 |
30 - 40
62 +
55 - 60 |
1145*
1060
4140 |
55 - 60
62 +
52 - 56 |
4150
6150
52100 |
58 - 62
58 - 62
55 - 62 |
Hardenable stainless
Pearlitic cast iron
(Ductile and grey) |
50 - 60
50 - 60 |
*fatigue proof, stress proof
Hardness range of plain carbon steels
Flame hardened to depth of one-eighht inch
Hardness
Rockwell C
|
70 |
|
|
|
|
|
|
| 60 |
|
|
|
|
|
|
| 50 |
|
|
|
|
|
|
| 40 |
|
|
|
|
|
|
| 30 |
|
|
|
|
|
|
| 20 |
|
|
|
|
|
|
| 10 |
|
|
|
|
|
|
| |
.10 |
.20 |
.30 |
.40 |
.50 |
.60 |
| |
Carbon Content, % |
Typical hardness curve for flame hardened medium carbon steels
Metal hardness conversion numbers (approx.)
| Rockwell C |
Scleroscope |
Brinelli 10 mm
Steel Ball |
66
65
64 |
_
_
_ |
701
686
671 |
63
62
61 |
84
82
81 |
656
642
628 |
60
59
58 |
80
78
77 |
613
600
584 |
57
56
55 |
76
74
73 |
574
561
548 |
54
53
52 |
71
70
69 |
536
524
512 |
51
50
49 |
67
66
65 |
500
488
476 |
48
47
46 |
63
62
61 |
464
453
442 |
45
44
43 |
59
58
57 |
430
419
408 |
42
41
40 |
56
54
53 |
398
387
377 |
39
38
37 |
52
51
50 |
367
357
347 |
36
35
34 |
48
47
46 |
337
327
318 |
33
32
31 |
45
44
43 |
309
301
294 |
30
29
28 |
42
41
40 |
286
279
272 |
27
26
25 |
39
38
37 |
265
259
253 |
24
23
22 |
36
36
35 |
247
241
235 |
21
20
|
34
33
|
230
220
|
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