Boiler tube - for pressure equipment, used at higher temperatures
Standards and steel grades,
Tube sizes acc. to EN, DIN, BS, NF A, UNI, STN, ČSN and PN-H standards,
Tube sizes acc. to GOST and TU standards,
Tube sizes acc. to ANSI standards,
Tube sizes acc. to ASME standards,
Precision tube sizes.
Boiler tube is made from heat resisting carbon and low alloyed steels which can withstand the load at high pressure and temperature. Boiler tube is used for parts of energy type equipment such as boilers, steam superheaters, steam pipelines, etc. The tubes are supplied as hot rolled or cold drawn. Specifications, dimensions and the steel grades are shown in a separate overview.
The boiler tubes are made from the following steels according to EN 10216-2: P195GH, P235GH, P265GH, 16Mo3, 14MoV6-2, 14MoV6-3, 10CrMo5-5, 13CrMo4-5, 10CrMo9-10, 11CrMo9-10, 25CrMo4, T2, T24, T5,T91; ASTM A 106: Grade A, Grade B, Grade C. Additional steel grades according to DIN 17175, BS 3059-1, BS 3059-2, BS 3602-1, BS 3604-1, NFA 49-211, NF A 49-213, UNI 5462, GOST 8731, GOST 4543, GOST 20072 and PN-H 74252 and its chemical composition and mechanical properties are shown in a separate overview.
Length of the boiler tube
|Diameter (OD) [mm]||Wall (WT) [mm]||Length (L) [m]|
|OD < 60,3||5 – 6|
|OD => 60,3||WT < 7,1||5 – 6 or 10 – 14 after an agreement 22,4|
|WT => 7,1||5 – 6|
Boiler tube straightnessStraightness deviation for the whole length of a tube 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 tubesThe ends of the tubes are vertical to the longitudinal axis and are without burrs.
Condition of the tubes surfaceThe tubes condition corresponds to the requirements of appropriate standards, heat treatment to the way of tube manufacturing and chemical composition of steel.
Marking of the tubes and tube bundlesThe tubes with the outside diameter up to 51 mm are marked with a label that is attached to the bundle. Larger tubes are marked at least at a one end of a tube by the necessary data.
Surface protection of the boiler tubesWhile ordering, it is necessary to agree upon the way and means of temporary protecting the surface of the tubes during transportation and storing. The tubes may be supplied without temporary preservation of the surface, or with the preservation of the surface with an agreed upon preservative.
Testing of boiler tubesThe boiler tubes are tested only with a specified testing.
Test comparison according to DIN 17175 and EN 10216 – 2:
DIN - grade level I
EN - testing class
Unalloyed steel– grade I or III, class TC1 or TC2;
Alloyed steel– level III, class TC2
A precise list of mandatory and optional tests is shown in standards.
The TR1 quality group is usually tested with nonspecified testing. The TR2 quality group is always tested with specified testing. The main difference in the mandatory tests between the TR1 and the TR2 is the fact, that in the TR2 quality the test is done using blow bending test at the 0°C temperature and as an optional test in this quality it is possible to agree on nondestructive test as a proof of longitudinal defects.
Certified test reportsCertified test reports are issued according to the appropriate TDC standards:
EN 10204 – 3.1 or 3.2
STN, ČSN 42 0251
ASTM A450, A530
DIN 50049 3.1.B