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	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

Product Pictures

Packaging and Delivery

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