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Products Description

JIS G3444 STEEL PIPES
STANDEARD: JIS G3444
GRADE: STKR 400, STKR490
Outside Diameter: 20MM × 20MM - 1200MM × 1200MM(SHS) Wall Thickness:1.3MM - 50MM(SHS)
Outside Diameter: 20MM × 30MM - 1200MM × 1500MM(RHS) Wall Thickness:1.2MM - 50MM(RHS)
LENGTH: 1M - 25M,commonly used 5.8M, 6M, 12M.
Surface Treatment: Galvanizing, Painting, Coating, Oiling

Chemical composition

CHEMICAL COMPOSITION OF JIS G3444,%MAX
GRADE	C	Si	Mn	P	S
STK 400	0.25%MAX	-	-	0.04%MAX	0.04%MAX
STK 500	0.24%MAX	0.35%MAX	0.3-1.3	0.04%MAX	0.04%MAX

Physical Requirements

MECHANICAL PROPERTIES OF JIS G3444
GRADE	Tensile Strength N/mm2	Yield Point or Proof Stress N/mm2	Weld Tensile N/mm2	Flattening Resistance Strength	Bendability
	Tensile Strength N/mm2	Yield Point or Proof Stress N/mm2	Weld Tensile N/mm2	Distance between Flat Plates (H)	Bending Angle, a)	Inside Radius
	Applicable Outside Diameter
	All Outside Diameters	All Outside Diameters	All Outside Diameters	All Outside Diameters	50 mm or under
STKR 400	400min	235min	400min	2/3D	90°	6D
STKR 500	500min	355min	500min	7/8D	90°	6D

Advantages

Highlighting advantages of jIS G3444 STEEL PIPES

Superior material cost and processing performance

JIS G3444 steel pipe is made of ordinary carbon steel (such as STKM11A, etc.), which has low material cost and is easy to process. Its welding performance is excellent, suitable for large-scale welding construction.

Stable mechanical properties

The standard has clear requirements for the tensile strength, yield strength and other mechanical properties of the steel pipe (such as tensile strength ≥310 MPa), which can meet the structural load-bearing requirements.

Moderate corrosion resistance

Through galvanized or coated carbon steel surface treatment, can improve the anti-corrosion ability, suitable for general industrial environment.

High dimensional accuracy

JIS standards strictly control the outer diameter and wall thickness tolerance of the steel pipe (such as the outer diameter tolerance of ±0.5%) to ensure the assembly accuracy.

Common application scenarios

JIS G3444 steel pipe is mainly used in the following fields:

1. Building structure: temporary or permanent support structures such as iron towers, scaffolding, pillars, etc.

2. Civil engineering: foundation pile, non-slip pile, bridge reinforcement, etc.

3. Industrial equipment: simple mechanical frame, pipeline support and other non-high pressure scenarios.

Precautions for storage, use, and maintenance

1. Storage environment

• Avoid stacking in the open to prevent rust caused by rain and humid air; For long-term storage, it is recommended to coat anti-rust oil or use galvanized steel pipes.

• The steel pipe should be placed in a dry and ventilated warehouse to avoid contact with corrosive substances such as acid and alkali.

2. Usage specifications

• When welding, it is necessary to clean the surface oxide to ensure the quality of the weld and avoid the strength reduction caused by impurities.

• Avoid overload use, especially pay attention to the lateral impact load on the tube body damage.

3. Check maintenance

• Check the surface corrosion regularly, and replace it in time when the corrosion depth exceeds 10% of the wall thickness.

• Focus on inspection of welding parts and joints to prevent cracks caused by stress concentration.

JIS G3444 STEEL PIPES

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