JIS G 3466

The JIS G3466 standard is a Japanese Industrial Standard that specifies the requirements for carbon steel square and rectangular tubes intended for general structural purposes. These tubes are widely used in construction, civil engineering, bridges, machinery, and various steel structures. They are characterized by their excellent weldability, uniform mechanical properties, and cost-effectiveness for structural frameworks.

JIS G3466 specifically covers carbon steel tubes for general structural purposes that are typically formed by a cold-forming process and subsequently electric resistance welded (ERW). These sections are supplied in the as-rolled condition without heat treatment unless otherwise specified.

This standard specifies requirements for the chemical composition, mechanical properties, and dimensional tolerances of these structural steel tubes.

If you are working with square or rectangular hollow sections (SHS, RHS) for structural applications in projects following Japanese or international specifications, understanding JIS G3466 is essential to ensure product quality, manufacturing consistency, and structural integrity.

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JIS G 3466 specifies the requirements for carbon steel square and rectangular tubes manufactured by an electric resistance welding (ERW) process. It is applicable to tubes used for civil engineering, construction, architecture, machinery, and other general structural applications. The standard primarily covers carbon steels, ensuring reliable mechanical properties for structural use.

In summary, JIS G3466 is the standard for general structural carbon steel tubes. Its specific focus on carbon steel grades and its foundation in the Japanese Industrial Standards (JIS) system. It is critically important for applications such as building frameworks, bridges, towers, and support structures.

The steels in JIS G 3466 are classified into several grades based on their tensile strength and yield point. Unlike the European standard which uses a detailed naming system with impact test indicators, JIS G 3466 uses a simpler grade designation system.

The primary grades specified in JIS G 3466 are:

 STK: Stands for "Steel Tube for general structure" (K is the designation for structural purposes).

 Number: Indicates the minimum tensile strength (N/mm²) of the material.

For example: STK 490

 STK -- Steel Tube for general structure

 490 -- Minimum tensile strength of 490 N/mm²

The chemical composition requirements vary by grade. The following table outlines the typical limits for the main grades (based on the standard, for reference).

The mechanical properties, including yield point (or proof stress) and tensile strength, are critical for structural design.

The tolerances on dimensions, such as the outside dimensions for square/rectangular tubes, thickness, and length, are established in accordance with the specifications outlined in JIS G 3466. These tolerances ensure consistency for fabrication and structural applications.

Dimensions of tubes(square)
Side length A×B mm	Wall thick- ness t mm	Reference
		Unit mass W kg/m	Sectional areaa) S cm²	Geometrical mo · men of inertia a) Ix,Iy cm4	Section modulus a) Zx,Zy cm3	Radius of gyration of cross"section a) ix,iy cm
40×40	1.6	1.88	2.392	5.79	2.90	1.56
40×40	2.3	2.62	3.332	7.73	3.86	1.52
50×50	1.6	2.38	3.032	11.7	4.68	1.96
50×50	2.3	3.34	4.252	15.9	6.34	1.93
50×50	3.2	4.50	5.727	20.4	8.16	1.89
60×60	1.6	2.88	3.672	20.7	6.89	2.37
60×60	2.3	4.06	5.172	28.3	9.44	2.34
60×60	3.2	5.50	7.007	36.9	12.3	2.30
75×75	1.6	3.64	4.632	41.3	11.0	2.99
75×75	2.3	5.14	6.552	57.1	15.2	2.95
75×75	3.2	7.01	8.927	75.5	20.1	2.91
75×75	4.5	9.55	12.17	98.6	26.3	2.85
80×80	2.3	5.50	7.012	69.9	17.5	3.16
80×80	3.2	7.51	9.567	92.7	23.2	3.11
80×80	4.5	10.3	13.07	122	30.4	3.05
90×90	2.3	6.23	7.932	101	22.4	3.56
90×90	3.2	8.51	10.85	135	29.9	3.52
100×100	2.3	6.95	8.852	140	27.9	3.97
100×100	3.2	9.52	12.13	187	37.5	3.93
100×100	4.0	11.7	14.95	226	45.3	3.89
100×100	4.5	13.1	16.67	249	49.9	3.87
100×100	6.0	17.0	21.63	311	62.3	3.79
100×100	9.0	24.1	30.67	408	81.6	3.65
100×100	12.0	30.2	38.53	471	94.3	3.50
125×125	3.2	12.0	15.33	376	60.1	4.95
125×125	4.5	16.6	21.17	506	80.9	4.89
125×125	5.0	18.3	23.36	553	88.4	4.86
125×125	6.0	21.7	27.63	641	103	4.82
125×125	9.0	31.1	39.67	865	138	4.67
125×125	12.0	39.7	50.53	103×10	165	4.52
150×150	4.5	20.1	25.67	896	120	5.91
150×150	5.0	22.3	28.36	982	131	5.89
150×150	6.0	26.4	33.63	115×10	153	5.84
150×150	9.0	38.2	48.67	158×10	210	5.69
175×175	4.5	23.7	30.17	145×10	166	6.93
175×175	5.0	26.2	33.36	159×10	182	6.91
175×175	6.0	31.1	39.63	186×10	213	6.86
200×200	4.5	27.2	34.67	219×10	219	7.95
200×200	6.0	35.8	45.63	283×10	283	7.88
200×200	8.0	46.9	59.79	362×10	362	7.78
200×200	9.0	52.3	66.67	399×10	399	7.73
200×200	12.0	67.9	86.53	498×10	498	7.59
250×250	5.0	38.0	48.36	481×10	384	9.97
250×250	6.0	45.2	57.63	567×10	454	9.92
250×250	8.0	59.5	75.79	732×10	585	9.82
250×250	9.0	66.5	84.67	809×10	647	9.78
250×250	12.0	86.8	110.50	103×102	820	9.63
300×300	4.5	41.3	52.67	763×10	508	12.00
300×300	6.0	54.7	69.63	996×10	664	12.00
300×300	9.0	80.6	102.70	143×102	956	11.80
300×300	12.0	106.0	134.50	183×102	122×10	11.70
350×350	9.0	94.7	120.70	232×102	132×10	13.90
350×350	12.0	124.0	158.50	298×102	170×10	13.70
The symbols in this table are as follows.   Note a) The values in this table are obtained by thefollowing formulae and rounded to four significant figures for sectional area(s)and to three significant figures for geometrical moment of inertia(),section modulus(Z)and radius of gyration of area(i),according to Rule A of JIS Z8401.