|
●
Grade and Chemical composition(%)
|
Grade
|
Chemical
composition(%)
|
|
|
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
Cu
|
Nb
|
Re
|
|
Max
|
|
20
|
0.17-0.24
|
0.17-0.37
|
0.35-0.65
|
0.035
|
0.035
|
0.25
|
0.25
|
0.20
|
--
|
--
|
|
35
|
0.32-0.40
|
0.17-0.37
|
0.50-0.80
|
0.035
|
0.035
|
0.25
|
0.25
|
0.20
|
--
|
--
|
|
45
|
0.42-0.50
|
0.17-0.37
|
0.50-0.80
|
0.035
|
0.035
|
0.25
|
0.25
|
0.20
|
--
|
--
|
|
27SiMn
|
0.24-0.32
|
1.10-1.40
|
1.10-1.40
|
0.035
|
0.035
|
0.25
|
0.25
|
0.20
|
0.020-0.050
|
0.02-0.04
|
Note: Other grade can also be provided after consulting as
per agreement.
●
Dimension Tolerances
|
Pipe Sizes (mm)
|
Tolerances (%)
|
|
Standard
|
Higher
|
|
OD
|
±1
|
±0.75
|
|
WT
|
≤20
|
±12.5
|
±10
|
|
>20
|
+12.5
-10
|
Note: Pipe OD
and wall thickness tolerances allowed as per GB/T17396
●
Mechanical Properties
|
Grade
|
Sample
Hat Treatment System
|
Rm, MPa Tensile Strength
|
Rel,
MPa Yield Point
|
A,% Elongation
|
ψ,%
Contrention
|
Akv,J
Impact Energy
|
Hardness
|
|
Less Than
|
|
20
35
40
|
--
|
400
510
590
|
245
305
335
|
20
17
14
|
--
|
--
|
--
|
|
27SiMn
|
920℃±20℃
Water quenching
450℃±50℃
Temper
Coolant:
oil or Water
|
980
|
835
|
12
|
40
|
39
|
217
|
●
Size
|
OD\WT
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
32
|
34
|
36
|
38
|
40
|
|
68
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
76(76.1)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
83(82.5)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 89(88.9) |
|
|
|
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|
|
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|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
95.5
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
102(101.6)
|
|
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|
105
|
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|
|
|
|
|
|
|
|
|
108
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
114(114.3)
|
|
|
|
|
|
|
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|
|
|
|
|
|
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|
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|
|
|
|
|
|
|
|
|
121
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
127
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
133
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
140(139.7)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
146
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
152(152.4)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
159
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
168(168.3)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
180(177.8)
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
194(193.7)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
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|
|
|
|
|
|
203
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
219(219.1)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
224
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
232
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
245(244.5)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
252
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
273
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
299
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
325(323.9)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
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|
|
Remarks: The new production line can produce OD size Max
457mm, Pls contact with sales people for updated information .
|
