Fine Grained Boiler Tube Tubing
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Fine Grained Boiler Tube
Seamless tubes for pressure equipment made from fine-grained steels
Tubes used for pressure and thermal equipment made up from fine-grained steels with a ferritic grain size 6 and finer are used in the areas where it is necessary to guarantee the required parameters of the notched impact strength of the steel. The tubes are used for parts of energy type equipments such as boilers, steam superheaters, steam pipelines, etc. Tubes made from the fine-grained steels are supplied as hot rolled or cold drawn.
Steel comparison according to the DIN and EN standards:
The fine-grained steels are supplied in 4 types of qualities
|
RADA
|
DIN 17179
|
EN 10216 – 3
|
||
|---|---|---|---|---|
|
marking
|
stel
|
marking
|
steel
|
|
| Basic |
StE
|
255, 285, 355, 420, 460
|
P-N
|
355, 460
|
| High – temperature |
WstE
|
255, 285, 355, 420, 460
|
P-NH
|
355, 460
|
| Low – temperature |
TstE
|
255, 285, 355, 420, 460
|
P-NL1
|
275, 355, 460
|
| Low – temperature custom |
EStE
|
255, 285, 355, 420, 460
|
P-NL2
|
275, 355, 460
|
Straightness of the tubes for pressure use made from fine-grained steel
Straightness deviation for the whole length of a tube L can not exceed value of 0.0015 x L. In conversion to the 1 meter length it can not exceed 3 mm.
Ends of the boiler tubes
The ends of the tubes are vertical to the longitudinal axis and are without burrs.
Testing of the tubes made from fine-grained steel
The tubes may be tested according to the tested category 1 (without ultrasound) or according to he tested category 2 (with ultrasound).
Ultra-fine grained (UFG) cylindrical tube were produced via recently developed tubular channel angular pressing (TCAP) process through different passes from as-cast AZ91 magnesium alloy. The microstructure and mechanical properties of processed tube through one to four passes of TCAP process at 200 °C were investigated. Micro hardness of the processed tube was increased to 98.5 HV after one pass from an initial value of 67 HV. An increase in the number of passes from one to higher number of passes has no more effect on the micro hardness. Yield and ultimate strengths were increased by 4.3 and 1.4 times compared to those in as-cast condition.
