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JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Seamless Steel Low Temperature Boiler Tube

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JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Seamless Steel Low Temperature Boiler Tube

Brand Name:	YUHONG
Model Number:	JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube
MOQ:	1000kgs
Packaging Details:	Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Payment Terms:	L/C,T/T

Detail Information

Product Description

Detail Information

Place of Origin:

CHINA

Certification:

ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008

Product Name:

Carbon Steel Heat Exchanger Tube

Standard Grade:

JIS G3461 STB 340

1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", Etc.

Thickness:

BWG10-25

Length:

Single Random, Double Random & Cut Length

Plain End, Beveled End

Surface Condition:

Oil, Black Painting

Highlight:

JIS G3461 STB 340 Carbon Steel Seamless Tube, Heat Exchanger Tube

Product Description

JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Low-Temperature Boiler Tube

A seamless carbon steel tube made to JIS G3461 grade STB 340, with minimum 340 MPa tensile strength, for heat transfer service in boilers and heat exchangers. The main advantage of STB 340 is that it delivers lowest life-cycle cost for applications where temperature is ≤400°C and fluids are not highly corrosive. This material used in economizers, firetubes, feedwater heaters, and LP evaporators. It combines strength, ductility, weldability, and availability at a price point that is hard to beat.

Equivalent Grades (Cross-reference)

Standard	Grade	Notes
ASTM A179 (USA)	Low-carbon seamless cold-drawn for heat exchangers	Almost identical; A179 requires 180 MPa min yield (slightly higher than STB 340)
ASTM A214 (USA)	Low-carbon welded for heat exchangers	Welded version, not seamless
EN 10216-1 (Europe)	P235TR1 or P235TR2	P235TR2 is closest (TS 360–480 MPa, YS ≥ 235 MPa)
GB 3087 (China)	10# or 20# seamless boiler tube	20# is stronger (TS ≥ 410 MPa)
DIN 17175 (Germany, obsolete)	St35.8	Replaced by EN 10216-1 P235TR2
Most direct equivalent: ASTM A179 (same low carbon, same ductility, similar strength). STB 340 is often interchangeable with A179 for shell-and-tube heat exchangers.

Chemical Composition % of JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Seamless Steel Boiler Tube

Standard	Grade	Chemical Composition Limits (%)
Standard	Grade	C	Si	Mn	P	S
JIS G3461	STB 340	≤ 0.18	≤ 0.3	0.30-0.60	≤ 0.035	≤ 0.035

Mechanical Properties of JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Seamless Steel Boiler Tube

Grade	Tensile Property (N/mm2)	Yield Point or Yield Strength (N/mm2)	Rockwell hardness HRB	Elongation (%)
				OD ≥20 mm	10 mm ≤OD ＜20 mm	OD ＜10 mm
				Longitudinal	Transverse	Transverse
STB 340	≥ 340	≥ 175	77 max.	≥ 35	≥ 30	≥ 27

Comparison with STB 340 Carbon Steel Heat Exchanger Tube vs. STB 410 Carbon Steel Heat Exchanger Tube

Grade	Tensile strength	Typical use	Cost
STB 340	≥ 340 (MPa)	Low/medium pressure, lower temperature (≤ 400°C): economizers, LP heat exchangers, firetubes	Lower
STB 410	≥ 410 (MPa)	Higher pressure/temperature (≤ 450°C): superheaters, high-pressure heat exchangers	Higher
Rule of thumb: Use STB 340 for economizers, feedwater heaters, and general low-temperature boiler tubes. Use STB 410 for superheaters and high-temperature waterwall tubes where creep strength is needed.

Applications

Feedwater heater (shell-and-tube type)
Economizer in a watertube boiler
Firetube boiler (e.g., Scotch marine boiler)
Air cooler / fin fan cooler
Low-pressure evaporator in HRSG

JIS G3461 STB 340 Carbon Steel Heat Exchanger Tube Seamless Steel Low Temperature Boiler Tube 0

Tags:

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube