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. %
38Cr2
2
5
590
62
630
60
5
40
600
60
580
62
620
60
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
38Cr2
+H
850
max.
59
57
54
49
43
39
37
35
32
30
27
25
24
23
22
—
min.
51
46
37
29
25
22
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
38Cr2
+HH
850
max.
59
57
54
49
43
39
37
35
32
30
27
25
24
23
22
min.
54
50
43
36
31
28
26
24
21
—
+HL
max.
56
53
48
42
37
33
31
29
26
24
21
—
—
—
min.
51
46
37
29
25
22
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
38Cr2
+CH
850
48
8
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.
