Applicable requirements in cases where the steel concerned has been ordered with reference to the steel names indicated in
Wire rod
Bar
Wire
T a b les B. 2,B.3,B.4 or B.5
Ta bles B. 2,B.3,B.4,B.5,B.6 or B,7
Optional
As hot-rolled or peeled
+AR or +PE
X
X
X
Chemical composition as specified in Table B.2
Mechanical properties as specified in Ta b le s B.3 ,B.4 and B.5
Chemical compositior as specified in Table B.2
Mechanical properties as specified in Tables B,3, B.4 and B.5
Values for hardenability according to Ta ble s B.6 and B.7
Supplementa- ry or special requirements as specified in Annex Eh
Cold drawn
+AR+C
-
X
X
Cold drawn + spheroidized
+AR+C+AC
-
X
X
Cold drawn + spheroidized+skin passed
+AR+C+AC +LC
-
X
X
Spheroidized or spheroidized+peeled
+AC or +AC +PE
X
X
X
Spheroidized+cold drawn
+AC+C
X
X
Treated to ferrite- pearlite structure and hardness range
+FP
-
X
-
Others
Other delivery conditions may be agreed at the time of ordering
a X=applicable,-=not applicable. b If agreed at the time of the enquiry and order.
2.化学组成
表B.2-表面硬化用钢的化学成分 (适用于铸造分析)
Steel name b
% mass fraction a
C
Si c
Mn
P
S
Cr
Ni
Mo
B
Cu
18MnB4
0,16 to 0,20
0,30
0,90 to 1,20
0,025
0,025
—
—
0,0008 to 0,005
0,25
Elements not quoted in this table should not be intentionally added to the steel without the agreement of the purchaser,except those intended for finishing the heat.All reasonable precautions shall be taken in order to prevent the addition of such elements from scrap or other materials used in the production process,which can affect the hardenability, mechanical properties and applicability To improve the performance of cold heading,it is possible to add Al:0,020 %to 0,050 % a Maximum values unless otherwise indicated. b In the case of steels with hardenability requirements (see Tables B.6 and B.Z),minor deviations from the specified limits are permitted (with the exception of sulfur and phosphorus),provided that they do not exceed 0,01 %for carbon and the values indicated in Table 2 for the other elements. c A lower silicon content or a specific silicon range may be agreed at the time of ordering
表B.2-表面硬化用钢的化学成分 (适用于铸造分析)
3.力学性能
表B.4-硼合金钢牌号的力学性能
Steel name
Diameter
Delivery condition
+AR
+AC or +AC+PE
+AR+C
+AR+C+AC
+AR+C+AC+LC
+AC+C
above mm
up to mm
Rm max. MPa
Za min %
Rm max. MPa
Z min. %
Rm max. MPa
Z min %
Rm max. MPa
Z min. %
Rm max. MPa
Z min. %
Rm max. MPa
Z min. %
18MnB4
2
5
—
—
500
64
540
62
5
10
580
55
500
64
680
53
480
64
520
62
600
59
10
40
580
55
500
64
670
53
480
64
520
62
590
59
a The values are given only for information.
4.淬透性要求
表B.6-标准淬透性钢种的硬度限值 (H级)
Steel name
Symbol
Austenitizing temperature ℃±5℃
Limits of range
Hardness HRC at a distance from quenched end of test piece(in mm)of
