JIS G3461 STB340 Carbon Steel Tubes
JIS G3461 STB340 Carbon Steel Tubes for Boiler and Heat Exchanger
Standard: JIS G3461
Carbon Steel Tubes for Boiler and Heat Exchanger
JIS G3461 STB 340 specifies the carbon steel tubes, used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superheater tubes, air preheater tubes, etc. of the boiler, and heat exchanger tubes, condenser tubes, catalyzer tubes, etc. used in chemical and petroleum industries.
JIS G3461 STB340 Carbon Steel Tubes Dimensional Range & Specification
Length：6000mm、12000m or specified length as required.
STB340 is a steel grade of JIS G3461 Standard Specification,This Japanese Industrial Standard specifies the carbon steel tubes
JIS G3461 STB340 Carbon Steel Tubes used for exchanging heat on the inside and outside of the tube, such aswater tubes, smoke tubes, superheater tubes, air preheater tubes, etc. of the boiler, and heat exchanger tubes, condenser tubes, catalyzer tubes, etc. used in chemical and petroleum industries.
However,JIS G3461 STB340 Carbon Steel Tubes are not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.
|Hot finished seamless steel tube
Cold finished seamless steel tube
Electric resistance welded steel tube other than hot finished or cold finished steel tube
Finished electric resistance welded steel tube
Fold finished electric resistance welded steel tube
As manufactured, as required, low temperature annealing or normalizing may be performed.
annealing,normalizing or full annealing.
As manufactured. However, as required, low temperature annealing or normalizing may be performed
Note:The cold finished electric resistance welded steel tube which has been normalized prior to cold finishing may be finished by annealing.
||Chemical Composition Limits (%)
Note:Where required by the purchaser, Si may be designated as 0.10 to 0.35%.
||Tensile Property (N/mm2)
||Yield Point or Yield Strength (N/mm2)
|OD ≥20 mm
||10 mm ≤OD ＜20 mm
||OD ＜10 mm
|NO. 11 Sample; NO. 12 Sample
||NO. 11 Sample
||NO. 11 Sample
Appearance of JIS G3461 STB340 Carbon Steel Tubes
(1) The tube shall be practically straight and its both ends shall be at right angles to its axis.
(2) The inside and outside surfaces of the tube shall be well-finished and free from defects injurious to use. However, in the case of electric resistance welded tube the swelling of inside surface of the weld shall be 0.25mm or less. In this case, if necessary, the purchaser may specify the inside swelling as 0.5mm or less for the tubes 50.8mm or under in outside diameter and at the same time 3.5mm or under in wall thickness.
Chemical Analysis , Tensile Test , Flattening Test , Flaring Test , Reverse flattening Test ,Hydrostatic Test or Nondestructive Examination.
W=0.02466 t (D-t)
W: unit mass of tube (Kg/m)
t: wall thickness of tube (mm)
D: outside diameter of tube (mm)
JIS G3461 STB340 Equivalent Steel Grade
||17175 st 35.8
||Sec 6 320