JIS G3461 Carbon Steel Tubes for Boiler and Heat Exchanger

JIS G 3461 Carbon Steel Boiler and heat exchanger tube

OD range: 15.9mm to 139.8mm.
Production process: Seamless and electric resistance welding.
Steel grades we offer: STB340 (STB35), STB410 (STB42) and STB510 (STB52).

JIS G3461 carbon steel boiler and heat exchanger tubes transfer heat well, inside and out. They are ideal for water pipes, smoke tubes, superheater tubes, and air preheaters. These tubes are also useful in the chemical and petroleum industries. However, they are not suitable for low temperature services.

All of our pipes are cold normalized before processing. They are either normalized or quenched and tempered, per their manufacturing process. This meets the high-temperature service requirements.

UNIASEN makes small tubes for compact heat exchangers and large tubes for industrial boilers. We follow Japanese Industrial Standards for carbon steel tube manufacturing. This ensures the highest quality and performance in the steel tubes you receive.

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JIS G3461 Specification

Norma de producción	JIS G3461
Procesos de manufactura	BW, ERW, SMLS
Diámetro exterior	DN10 – DN125
Espesor de pared	1.2mm – 12.5mm
Longitud del tubo	específico, aleatorio
Grado de acero	STB340, STB410, STB510
Prevención de la corrosión	Laca, barniz, aceitado, galvanizado
Procesos finales	Corte cuadrado, biselado, roscado, encaje
Tratamiento posterior	Soldadura, plegado, perforación, punzonado, estampado, ahusamiento, abocardado, expansión

Dimension of JIS G3461

Diámetro exterior y espesor de pared especificados admisibles
Specified Outside Diameter D mm (in.)	Specified Wall Thickness t mm (in.)
Specified Outside Diameter D mm (in.)	Tamaños de luz especiales a	Tamaños regulares
≥ 10,3 (0,405) a < 13,7 (0,540)	—	≥ 1,7 (0,068) a ≤ 2,4 (0,094)
≥ 13,7 (0,540) a < 17,1 (0,675)	—	≥ 2,2 (0,088) a ≤ 3,0 (0,118)
≥ 17,1 (0,675) a < 21,3 (0,840)	—	≥ 2,3 (0,091) a ≤ 3,2 (0,125)
≥ 21,3 (0,840) a < 26,7 (1,050)	—	≥ 2,1 (0,083) a ≤ 7,5 (0,294)
≥ 26,7 (1,050) a < 33,4 (1,315)	—	≥ 2,1 (0,083) a ≤ 7,8 (0,308)
≥ 33,4 (1,315) a < 48,3 (1,900)	—	≥ 2,1 (0,083) a ≤ 10,0 (0,394)
≥ 48,3 (1,900) a < 60,3 (2,375)	—	≥ 2,1 (0,083) a ≤ 12,5 (0,492)
≥ 60,3 (2,375) a < 73,0 (2,875)	≥ 2,1 (0,083) a ≤ 3,6 (0,141)	> 3,6 (0,141) a ≤ 14,2 (0,559)
≥ 73,0 (2,875) a < 88,9 (3,500)	≥ 2,1 (0,083) a ≤ 3,6 (0,141)	> 3,6 (0,141) a ≤ 20,0 (0,787)
≥ 88,9 (3.500) a < 101,6 (4.000)	≥ 2,1 (0,083) a ≤ 4,0 (0,156)	> 4,0 (0,156) a ≤ 22,0 (0,866)
≥ 101,6 (4.000) a < 168,3 (6.625)	≥ 2,1 (0,083) a ≤ 4,0 (0,156)	> 4,0 (0,156) a ≤ 25,0 (0,984)
≥ 168,3 (6,625) a < 219,1 (8,625)	≥ 2,1 (0,083) a ≤ 4,0 (0,156)	> 4,0 (0,156) a ≤ 40,0 (1,575)
≥ 219,1 (8,625) a < 273,1 (10,750)	≥ 3,2 (0,125) a ≤ 4,0 (0,156)	> 4,0 (0,156) a ≤ 40,0 (1,575)
≥ 273,1 (10,750) a < 323,9 (12,750)	≥ 3,6 (0,141) a ≤ 5,2 (0,203)	> 5,2 (0,203) a ≤ 45,0 (1,771)
≥ 323,9 (12.750) a < 355,6 (14.000)	≥ 4,0 (0,156) a ≤ 5,6 (0,219)	> 5,6 (0,219) a ≤ 45,0 (1,771)
≥ 355,6 (14.000) a < 457 (18.000)	≥ 4,5 (0,177) a ≤ 7,1 (0,281)	> 7,1 (0,281) a ≤ 45,0 (1,771)
≥ 457 (18.000) a < 559 (22.000)	≥ 4,8 (0,188) a ≤ 7,1 (0,281)	> 7,1 (0,281) a ≤ 45,0 (1,771)
≥ 559 (22.000) a < 711 (28.000)	≥ 5,6 (0,219) a ≤ 7,1 (0,281)	> 7,1 (0,281) a ≤ 45,0 (1,771)
≥ 711 (28.000) a < 864 (34.000)	≥ 5,6 (0,219) a ≤ 7,1 (0,281)	> 7,1 (0,281) a ≤ 52,0 (2,050)
≥ 864 (34.000) a < 965 (38.000)	—	≥ 5,6 (0,219) a ≤ 52,0 (2,050)
≥ 965 (38.000) a < 1422 (56.000)	—	≥ 6,4 (0,250) a ≤ 52,0 (2,050)
≥ 1422 (56.000) a < 1829 (72.000)	—	≥ 9,5 (0,375) a ≤ 52,0 (2,050)
≥ 1829 (72.000) a < 2134 (84.000)	—	≥ 10,3 (0,406) a ≤ 52,0 (2,050)
NOTE Standardized values for specified outside diameter and specified wall thickness of pipe are given in ISO 4200 [7] and ASME B36.10M[8]
a Pipe having the combination of specified outside diameter and specified wall thickness is defined as special light size pipe; other combinations given in this table are defined as regular size pipe.

JIS G3461 Chemical Requirement

Our JIS G 3461 Carbon Steel Tubes. Their chemical composition is carefully regulated during manufacturing. This ensures they can withstand the high temperatures and pressures in boilers and heat exchangers. This precise control of the chemical composition makes the tubes resistant to corrosion and wear. It extends their service life and reduces maintenance needs.

Símbolo de grado	C	Si	Minnesota	PAG	S
STB 340	0,18 máx.	0,35 máx.	0,30 a 0,60	0,035 máx.	0,035 máx.
STB 410	0.32 max.	0,35 máx.	0,30 a 0,80	0,035 máx.	0,035 máx.
STB 510	0,25 máx.	0,35 máx.	1.00 to 1.50	0,035 máx.	0,035 máx.

Mechanical Requirement of JIS G3461

At UNIASEN we recognise the critical role that mechanical properties play in the performance of heat exchangers and boilers. Our JIS G 3461 carbon steel tubes are able to withstand the stresses and strains of high temperature service. These tubes are heat treated, either normalised or quenched and tempered, to enhance their mechanical properties and ensure they provide optimum performance under demanding conditions.

Propiedades mecánicas
Símbolo de grado	Resistencia a la tracción N/mm2	Punto de fluencia o tensión de prueba N/mm2	Alargamiento %
			Outside Diameter under 10 mm	Outside Diameter 10 mm or over to and excl.20 mm	Outside Diameter 20 mm or over
			Outside Diameter under 10 mm	Outside Diameter 10 mm or over to and excl.20 mm	Outside Diameter 20 mm or over
			Test Piece for Tensile Test
			No. 11 Test Piece	No. 11 Test Piece	No. 11 or No. 12 Test Piece
STB 340	340 min.	175 min.	27 min.	30 min.	35 min.
STB 410	410 min.	255 min.	17 min.	20 min.	25 min.
STB 510	510 min.	295 min.	17 min.	20 min.	25 min.
NOTA: 1 N/mm2=1 MPa