Single values are maxima unless indicated otherwise; unlisted elements and blank cells are not assumed zero. Alternative limits, optional additions and analysis tolerances require the relevant table notes and order agreement. This reference table does not replace the complete standard.
3.力学性能
表C.5-不含硼合金钢牌号的力学性能
Steel name
Diameter
Delivery condition
+AC or +AC+PE
+AC+C+AC
+AC+C+AC+LC
above mm
up to mm
Rm max. MPa
Z min %
Rm max. MPa
Z min. %
Rm max. MPa
Z min. %
34Cr4
2
5
—
—
570
64
610
62
5
40
580
62
560
64
600
62
4.淬透性要求
表C.7-具有规定 (正常) 淬透性的不含硼的钢种的硬度限值 (H级)
Steel name
Sym- bol
Austenitizing temperature °℃±5℃
Limits of range
Hardness HRC at a distance from quenched end of test piece(in mm) of
1
2
3
4
5
6
7
8
9
10
11
13
15
20
25
30
34Cr4
+H
850
max.
57
57
56
54
52
49
46
44
39
37
35
34
33
32
31
min.
49
48
45
41
35
32
29
27
23
21
20
—
—
表C.9-淬透性受限的无硼钢种的硬度限值散射带 (HH和HL等级) a
Steel name
Symbol
Austenitizing temperature °℃±5℃
Limits of range
Hardness HRC at a distance from quenched end of test piece(in mm) of
1,5
3
5
7
9
11
13
15
20
25
30
35
40
45
50
34Cr4
+HH
850
max
57
57
56
54
52
49
46
44
39
37
35
34
33
32
31
min.
52
51
49
45
41
38
35
33
28
m
25
24
23
22
21
+HL
max
54
54
52
50
46
43
40
38
34
32
30
29
28
27
26
min.
49
48
45
41
35
32
29
27
23
21
20
min.
56
55
53
51
47
43
41
39
35
31
29
27
26
25
24
min.
53
52
50
47
41
37
34
32
29
26
23
21
——
——
This table is not applicable to steels ordered with a restricted range of carbon content,see footnote c)in Table C.2.
表C.10-芯部硬度试验中至少应获得90% 马氏体的最大直径 (+ CH等级)
Steel name
Symbol
Austenitizing temperature in the core hardening testa C±5℃
Min.core hardness ( 90 %martensite structure) HRC
Maximum diameter to ensure 90 %of martensite in the coreb mm
34Cr4
+CH
850
46
14
a As a guideline,a hardening time at temperature of at least 30 min is recommended. The maximum diameters stated are those attainable with the lowest hardenability within each steel grade.Using +HH grades the maximum diameter can be increased.
