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Mechanical Properties & Hardness

Quench-and-tempering or heat treating requirements for 1045, 4140, and 4340 plate usually call out a hardness range, but it is not uncommon for an application to require certain mechanical properties beyond hardness. Normal ranges of mechanical properties corresponding to a specific hardness are listed below. These are intended as guidelines only; actual results may vary because of variations in chemistry, part configuration, and grain size, so please consult an Oliver sales engineer or your heat-treater. Also, it should be expected that 4340 will be at the high end of the range, and 1045 at the low end.

Hardness
Rockwell
C
Hardness
Brinell
Tensile
Strength (ksi)
Yield Point
(ksi)
Elongation,%
Reduction
Of Area, %
Low
High
Low
High
Low
High
Low
High
14
197
93
103
69
78
22
28
60
68
16
207
98
108
73
84
21.5
27.5
59
67
18
217
103
114
76
90
21
27.5
58
66
20
223
106
117
79
93
20.5
26.3
57.5
65.5
22
235
112
124
85
99
20
25.5
56.5
64.5
24
248
118
131
92
107
19.5
24.5
55
63
26
262
124
138
99
114
18.5
24
54
61.5
28
277
131
146
107
122
18
22.5
52
60
30
292
138
154
116
131
17
22
51
59
32
311
146
164
125
141
16
20.5
49
57
34
321
151
170
131
146
15.5
20
48
56
36
341
160
180
141
157
14.5
18.5
46
54
38
363
171
193
153
170
13.5
17
43.5
51.5
40
379
178
201
163
179
12.5
16
42
50
42
401
188
222
176
185
11
15
40
49
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