JIS G3461 Carbon Steel Tube

JIS G3461 Carbon Steel Tubes for Boiler and Heat Exchanger

Scope:JIS G3461 Carbon Steel Tubes is mainly used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superheater tubes, air preheater tubes, etc.Its application fields are: boiler tubes, heat exchanger tubes, condenser tubes, catalyzer tubes, etc. It can also be used in chemical and petroleum industries, But it can't be used for low temperature service.

 

Chemical Composition:

 Grade Mfg.

Process

Chemical Composition (%)
C Si Mn P S Ni Cr Mo Others
STB35 S, E 0.18Max 0.35Max 0.30~0.60 0.035Max 0.035Max - - - -
STB42 S, E 0.32Max 0.35Max 0.30~0.60 0.035Max 0.035Max - - - -
STB52 S, E 0.25Max 0.35Max 1.00~1.50 0.035Max 0.035Max - - - -

Mechanical Properties:

  Symbol of class  Tensile strength

N/mm2

{kgf/mm2}

 Yield point or proof stress
N/mm2

{kgf/mm2}

Elongation %
Outside diameter 20mm or over Outside diameter 10mm or over to and excl. 10mm Outside diameter under 10mm
No. 11 test piece No. 12 test piece No. 11 test piece No. 11 test piece
STB340

STB410

STB510

340{35}min.

410{42} min.

510{52} min.

175{18} min.

255{26} min.

295{30} min.

35 min.

25 min.

25 min.

30 min.

20 min.

20 min.

27 min.

17 min.

17 min.

Manufacture Method:

 Symbol of class Heat treatment
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
STB 340 As manufactured, as required, low temperature annealing or normalizing may be performed. Low temperature annealing, normalizing or full annealing. Normalizing As manufactured. However, as required, low temperature annealing or normalizing may be performed.    Normalizing
STB 410 As manufactured. However, as required, low temperature annealing or normalizing may be performed. Low temperature annealing, normalizing or full annealing. Normalizing Low temperature annealing
STB 510 Normalizing

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