JIS G3466

JIS G3466 Steel Pipe

At UNIACERO, we specialize in JIS G3466 carbon steel square and rectangular tubes, designed primarily for structural applications in civil engineering and construction. These tubes are manufactured to the highest standards, ensuring durability, reliability, and efficiency. Whether you’re involved in civil engineering or construction, our JIS standardized tubes provide the structural integrity and strength required for your projects.

JIS G3466 Specification

Our steel tubes are manufactured using advanced techniques, ensuring they meet the highest standards of quality. Available in grades STKR 400 and STKR 490, these tubes undergo rigorous testing to ensure their mechanical and chemical properties are up to mark. With options for galvanized steel sheets or strips, our tubes can be customized to your specific requirements. Additionally, our tubes come with plain ends, but bevel ends can be provided upon request.

Standard	JIS G3466
Usage	Used for civil engineering architecture and other sturctures
Steel Grade	STKR400			STKR490
Manufacturing Processess	ERW and Seamless into square tubes.
Specification	Square	2020 to 350350
	Rectangular	3020 to 400200
Wall Thickness	1.2 – 12.5 mm
	1.2 – 12mm
Chemical Composition	–	C	Si	Mn	P	S
	STKR400	≤0.25	–	–	≤0.04	≤0.04
	STKR490	≤0.18	≤0.55	≤1.5	≤0.04	≤0.04
Mechanical Properties	–	Tensile Strength(Mpa)		Yield Strength(Mpa)		Elongation %
	STKR400	≥400		≥245		≥23
	STKR490	≥490		≥325		≥23
Wall thickness tolerance	Welded	Under 3mm {0.3mm},3mm or over {10%}
	Seamless	Under 45mm {0.6mm},45mm or over {15%}
Reqired Test	Chemical Analysis
	Tensile test
Equivalent Standard	ASTM A500 {Gr.B Gr.C}
	EN10025 {S275JR S355J0}
	KS {SPSR400 SPSR490}

JIS G3466 Dimension Table

This standardized tubes come in a variety of dimensions to suit your needs:

Square Size: Ranging from 4040mm to 350350mm.
Rectangular Size: Ranging from 2050mm to 200400mm.
Wall Thickness: Ranging from 1.6-12mm.

Chemical Requirements of JIS G3466

The chemical composition of our JIS G3466 tubes is meticulously controlled:

STKR 400: C ≤0.25%, P ≤0.040%, S ≤0.040%.
STKR 490: C ≤0.18%, Si ≤0.55%, Mn ≤1.5%, P ≤0.040%, S ≤0.040%.

Symbol of Grade	C	Si	Mn	P	S
STKR400	0.25 max.	–	–	0.040 max.	0.040 max.
STKR490	0.18 max.	0.55 max.	1.50 max.	0.040 max.	0.040 max.
Note If necessary，Other alloy elements than those given in this table may be added.

Mechanical Requirements of JIS G3466

Our tubes are tested to ensure they meet the required mechanical properties:

STKR 400: Tensile Strength ≥ 400 MPa, Yield Strength ≥ 245 MPa, Elongation ≥ 23%.
STKR 490: Tensile Strength ≥ 490 MPa, Yield Strength ≥ 325 MPa, Elongation ≥ 23%.

Mechanical Properties
Symbol of Grade	Tensile Strength N/mm2	Yield Point or Proof Stress N/mm2	Elongation %
			Tensile Test piece	Test direction
			Test piece No.5	Tube axis direction
STKR400	400 min.	245 min.	23 min.
STKR490	490 min.	325 min.	23 min.
NOTE: 1 N/mm2=1 MPa

Steel Grades in JIS G3466

We offer the standardized tubes in two primary steel grades:

STKR 400: Ideal for general structural applications, offering a balanced mix of strength and flexibility.
STKR 490: Provides higher tensile strength, making it suitable for more demanding structural applications.

Production Tolerance of JIS G3466

Table 4.Dimensional TolerancesSpeclfied item and dimensionDimensional tolerancesLength of side100 mm or under±1.5mmOver 100 mm±1.5%Unevenness of flat plate portion of each sideSide length 100 mm or under0.5 mm maxSide length over 100 mmWithin 0.5% of side lengthAnguiarity made by adfacent flat plate portions±1.5%Dimension at corner: s3mm maxLength+ not specifird 0UnstraightnessWithin 0.3% of side lengthWall thicknessSquare steel tube manufactured by weldingUnder 3 mm±0.3mm3 mm or over±10%Seamless square steel tubeUnder 4 mm±0.6mm4 mm or over±15%

Table Dimensional Tolerances
Speclfied item and dimension			Dimensional tolerances
Length of side	100 mm or under		±1.5mm
	Over 100 mm		±1.5%
Unevenness of flat plate portion of each side	Side length 100 mm or under		0.5 mm max
	Side length over 100 mm		Within 0.5% of side length
Anguiarity made by adfacent flat plate portions			±1.5%
Dimension at corner: s			3mm max
Length			+ not specifird 0
Unstraightness			Within 0.3% of side length
Wall thickness	Square steel tube manufactured by welding	Under 3 mm	±0.3mm
	Square steel tube manufactured by welding	3 mm or over	±10%
	Seamless square steel tube	Under 4 mm	±0.6mm
	Seamless square steel tube	4 mm or over	±15%