JIS G3461 Carbon Steel Tubes

JIS G3461: Carbon Steel Tubes for Boiler and Heat Exchanger

Standard: JIS G3461
We mainly produce different grades of carbon steel pipes, regarding STB 340, STB 410, STB 510, etc.

Applications JIS G3461 carbon steel tube is a kind of pipe used for transferring heat inside and outside the pipe. Can be widely used as boiler water tube, smoke tube, superheater tube, air preheating tube, accessories.

Advantages of JIS G3461 Carbon Steel Pipe

JST advanced rolling technology can make the quality and mechanical properties of this pipe get the standard value. Under the control of our advanced rolling technology, our carbon steel tubes for boiler and heat exchanger own smaller tolerance range than that from other manufacturers.
We own micro oxidization or non-oxidation treatment furnaces with temperature difference below 5℃. This furnace makes no oxide layer on the surface of carbon steel pipes and ensures smooth surface and stable performance of carbon steel tubes.
Iwowwee has multiple inspection machines and professional inspectors which obtained the correct qualified certificates.
JST production process is relative to PDCA circular total quality management system (TQMS). Certainly strictly control the production process of carbon steel pipes for boiler and warmth exchanger. As indicated by customers' requirements, we can do inspections for JIS G3461 carbon steel tubes, regarding eddy current inspection, magnetic particle inspection, magnetic flux leakage inspection, ultrasonic joint inspection, quite a few. We are also in a very provide inspection reports.
JST possesses professional physical and chemical testing center with international advanced testing equipment for testing carbon steel pipes. We have German full spectrum direct-reading spectrometer, Japan metallurgical microscope, impact testing machine, tensile testing machine, computer controlled electro-hydraulic servo universal testing machine in conjunction with a variety of machine tools. They can do tensile, flaring, flattening, curling together with other physical tests for carbon steel tubes in order to guarantee thier stable performance.

Parameters of JIS G3461 Carbon Steel Pipe

1. Mechanical Properties

Grade Tensile Property (N/mm2) Yield Point or Yield Strength (N/mm2) Elongation (%)
OD ≥20 mm 10 mm ≤OD <20 mm OD <10 mm
NO. 11 Sample; NO. 12 Sample NO. 11 Sample NO. 11 Sample
Longitudinal Transverse Transverse
STB340 ≥ 340 ≥ 175 ≥ 35 ≥ 30 ≥ 27
STB410 ≥ 410 ≥ 255 ≥ 25 ≥ 20 ≥ 17
STB510 ≥ 510 ≥ 295 ≥ 25 ≥ 20 ≥ 17

1. OD refers to outside diameter.
2. The above table is only applicable for heat exchanger carbon steel tubes. The buyer can appoint the upper limit value of tensile strength. The upper limit value of tensile strength is the above shown value plus 120 N/mm2.
3. For the carbon steel pipes with the thickness of less than 8 mm, we use NO.12 sample for tensile test. The minimum elongation will be reduced by 1.5% from the table value when the thickness reduces 1 mm. The value ​​obtained will be rounded to an integer value according to JIS Z8401 (a rounding method).
4. When we take the electric resistance welded steel pipes for tensile test, we also choose NO.12 sample from the parts not containing welding seams.

2. Chemical Composition of JIS G3461 Carbon Steel Pipe (Unit: %)

Standard Grade Chemical Composition Limits (%)
C Si Mn P S
JIS G3461 STB340 ≤ 0.18 ≤ 0.3 0.30-0.60 ≤ 0.035 ≤ 0.035
STB410 ≤ 0.32 ≤ 0.35 0.30-0.80 ≤ 0.035 ≤ 0.035
STB510 ≤ 0.25 ≤ 0.35 1.00-1.50 ≤ 0.035 ≤ 0.035


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