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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 |
| STKR 400 | 0.25%MAX | - | - | 0.04%MAX | 0.04%MAX |
| STKR 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 | |
| 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
Attention
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.
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