ERW steel pipe domestic product technology structure assessment of 2005
No.
|
Technical level
|
Pipe category
|
Yield
(10,000 tons)
|
proportion
（％）
|
1
|
First-level
|
X80 grade steel pipeline;
N80, P110 steel grade oil casing and tubing;
alloy boiler tubes
|
0
|
0
|
2
|
Second-level
|
X65,X70 grade pipeline
|
17
|
1.38
|
3
|
3rd-level
|
X52,X60 grade pipeline，
J55, H40 grade oil casing,
STB410-520 boiler tubes，
σb≥600Mpa grade hydraulic cylinder tube
|
60
|
4.88
|
4
|
4th-level
|
belt conveyor roller tubes,
automotive transmission pipes,
low-pressure boiler tubes;
490Mpa grade scaffolding tubes,
thick high-strength structural tubes;
hydraulic support tube,
cold drawn cylinder tube,
transformer tube
|
150
|
12.22
|
5
|
5th-level
|
hierarchy pressure fluid pipes,
mining fluid pipes,
deep well pump tube
|
200
|
16.29
|
6
|
6th-level
|
low pressure fluid pipes,
(including galvanized pipe, plastic composite pipe),
the general structure of the tube,
small diameter square and rectangular tube
|
800
|
65.19
|
7
|
Total
|
1227
|
100
|
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