JIS G3466 Carbon Steel Square And Rectangular Tubes

JIS G3466 is a Japanese industrial standard. JIS G3466 square and rectangular pipes are carbon steel pipes used for civil engineering, construction, and other structural applications.

JIS G3466 Square and Rectangular Tube Specification

Grade: STKR 400, STKR 490

Square Size: 40*40mm-350*350mm

Rectangular Size: 20*50mm-200*400mm

Wall Thickness: 1.6-12mm

Application: For Civil Engineering, Architecture, Other Structures

Technique: Cold-finished ,hot-finished, ERW

MOQ: 3 Tons

Payment Terms: T/T, L/C

JIS G3466 Structural Pipe Chemical composition:

Steel Grade	Chemical Composition %
	C	Si	Mn	P	S
STKR 400	0.25 max.	-	-	0.040 max.	0.040 max.
STKR 490	0.18 max.	0.55 max.	1.50 max.	0.040 max.	0.040 max.

JIS G3466 Carbon Structural Pipe Mechanical proporties:

Steel Grade	Tensile strength	Yield Strength	Elongation %
	N/mm²	N/mm²	(No.5 test piece)
STKR 400	400 {41} min.	245 {25} min.	23 min.
STKR 490	490 {50} min.	325 {33} min.	23 min.

JIS G3466 Carbon Structural Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Five Methods for Detecting Surface Defects in JIS G3466 Rectangular Pipes

1. Eddy Current Testing
Eddy current testing comes in various forms, including conventional eddy current testing, remote field eddy current testing, multi-frequency eddy current testing, and pulsed eddy current testing. Using eddy current sensors, different types and shapes of defects on the surface of JIS G3466 structural pipes generate different signals. The advantages of this method are high detection accuracy, high sensitivity, fast detection speed, and the ability to detect both the surface and subsurface of the pipes, regardless of surface contaminants like oil. The disadvantages include a high false detection rate, where non-defect structures may be misidentified as defects, and difficulty in adjusting detection resolution.

2. Ultrasonic Testing
When ultrasonic waves enter a material and encounter a defect, part of the sound wave is reflected. The transmitter and receiver can analyse the reflected waves to accurately detect defects. Ultrasonic testing is commonly used for inspecting forgings, offering high flaw detection sensitivity. However, it is challenging to inspect pipes with complex shapes, requires a certain level of surface smoothness on the rectangular pipes, and needs a coupling agent to fill the gap between the probe and the inspected surface.

3. Magnetic Particle Testing
Magnetic particle testing works by creating a magnetic field within the JIS G3466 rectangular pipe material. When there are surface or near-surface discontinuities or defects, the magnetic field lines distort locally, creating magnetic poles at these discontinuities. The advantages include low equipment investment, high reliability, and intuitive results. The disadvantages are high operating costs, inability to accurately classify defects, and slower detection speed.

4. Infrared Testing
Using high-frequency induction coils, eddy currents are generated on the surface of the JIS G3466 rectangular pipes. These currents cause defect areas to consume more electrical energy, raising the local temperature. Infrared detection of this temperature rise helps determine the depth of defects. Infrared testing is generally used for detecting defects on flat surfaces and is not suitable for uneven metal surfaces.

5. Magnetic Flux Leakage Testing
The magnetic flux leakage testing method is very similar to magnetic particle testing but offers a broader application range, higher sensitivity, and greater reliability compared to magnetic particle testing.

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