JIS G3444 Steel Pipe

JIS G3444 Specification & Introduction

  1. Our JIS G3444 Structural Steel Tubes come with a comprehensive specification that includes dimensions, production procedures, steel grades, surface coatings, end types, joint methods, and machining services. 
  2. The tubes are available in a variety of dimensions to suit your specific needs. 
  3. They are produced using advanced procedures that ensure their structural integrity and durability. 
  4. The steel grades used in their production are chosen for their strength and resistance to wear. 
  5. The tubes are coated to protect against corrosion and can be customized with different end types and joint methods. 
  6. Additionally, we offer machining services to tailor the tubes to your exact specifications.
erw pipe
StandardJIS G 3444
ProcedureSMLS ERW SAWL SAWH
Dimensions21.7-1016.0mm
Thickness2.0-22mm
Unit Length3-18m
Steel GradeSTK290STK 500
STK 400STK 540
STK 490
Surface CoatingBlack lacquer coating,Varnishing, Oiling, Hot Dip Galvanizing
FBE, 2PP, 3PP, 2PE, 3PE
End TypePlain, Bevelled, Threaded, Grooved,Shouldered
Joint MethodFitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe MachiningWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

JIS G3444 Dimension Table

schematic-diagram-of-pipe-dimension
  1. The dimensions of our JIS G3444 Structural Steel Tubes are meticulously designed to meet a variety of application needs. 
  2. They are available in a range of outer diameters, wall thicknesses, and lengths, providing you with the flexibility to choose the perfect size for your project. 
  3. The outer diameter can range from small sizes suitable for intricate structures to larger sizes ideal for robust constructions. 
  4. The wall thickness is carefully calibrated to balance strength and flexibility. 
  5. The length of the tubes can be customized to fit your specific requirements. 
  6. With PandaPipe, you have the freedom to choose the dimensions that best suit your needs.
Outside Diameter mm Wall Thickness mm
21.7 2
27.2 2 2.3
34 2.3
42.7 2.3 2.5
48.6 2.3 2.5 2.8 3.2
60.5 2.3 3.2 4
76.3 2.8 3.2 4
89.1 2.8 3.2
101.6 3.2 4 5
114.3 3.2 3.5 4.5
139.8 3.6 4 4.5 6
165.2 4.5 5 6 7.1
190.7 4.5 5.3 6 7 8.2
216.3 4.5 5.8 6 7 8 8.2
267.4 6 6.6 7 8 9 9.3
318.5 6 6.9 8 9 10.3
355.6 6.4 7.9 9 9.5 12 12.7
406.4 7.9 9 9.5 12 12.7 16 19
457.2 9 9.5 12 12.7 16 19
500 9 12 14
508 7.9 9 9.5 12 12.7 14 16 19 22
558.8 9 12 16 19 22
600 9 12 14 16
609.6 9 9.5 12 12.7 14 16 19 22
700 9 12 14 16
711.2 9 12 14 16 19 22
812.8 9 12 14 16 19 22
914.4 12 14 16 19 22
1016 12 14 16 19 22

Chemical Requirements of JIS G3444

  1. Our JIS G3444 Structural Steel Tubes meet stringent chemical requirements to ensure their durability and performance. 
  2. The tubes are composed of a carefully balanced mix of carbon, manganese, phosphorus, sulfur, and silicon. 
  3. The carbon content gives the tubes their strength and hardness, while manganese enhances their toughness. 
  4. Phosphorus and sulfur are kept to a minimum to prevent brittleness, and silicon is added for its heat-resisting properties. 
  5. At PandaPipe, we ensure that the chemical composition of our tubes meets the highest standards, giving you a product that delivers exceptional performance.
Chemical Composition  Unit:%
Symbol of Grade C Si Mn P S
STK290 0.050 max. 0.050 max.
STK400 0.25 max. 0.040 max. 0.040 max.
STK490 0.18 max. 0.55 max. 1.65 max. 0.035 max. 0.035 max.
STK500 0.24 max. 0.35 max. 0.30 to 1.30 0.040 max. 0.040 max.
STK540 0.23 max. 0.55 max. 1.50 max. 0.040 max. 0.040 max.

Mechanical Requirements of JIS G3444

  1. The mechanical properties of our JIS G3444 Structural Steel Tubes are designed to withstand the demands of various applications. 
  2. They exhibit high tensile strength, ensuring they can resist large amounts of force without breaking. 
  3. Their yield strength is also high, meaning they can deform under pressure without permanently losing their shape. 
  4. The tubes also have good ductility, allowing them to be bent and shaped without cracking. 
  5. With these mechanical properties, our tubes offer you the durability and flexibility you need for your projects.
Symbol of Grade Tensile Strength N/mm2 Yield Point or Proof Stress N/mm2 Weld Tensile Strength N/mm2 Flattening Resistance Bendability
Distance Between Flat Plates(H) Bending Angle Inside Radius
Applicable Outside Diameter
All Outside Diameters All Outside Diameters All Outside Diameters All Outside Diameters 50 mm or under
STK290 290 min. 290 min. 2/3 D 90° 6 D
STK400 400 min. 235 min. 400 min. 2/3 D 90° 6 D
STK490 490 min. 315 min. 490 min. 7/8 D 90° 6 D
STK500 500 min. 355 min. 500 min. 7/8 D 90° 6 D
STK540 540 min. 390 min. 540 min. 7/8 D 90° 6 D
NOTE 1 In this table,D stands for the outside diameter of tube.

Steel Grades of JIS G3444 Steel Pipes

  1. We offer JIS G3444 Structural Steel Tubes in a variety of steel grades, each with its unique properties to suit different applications. 
  2. The grades include STK290, STK400, STK500, and STK490, each offering varying levels of strength, ductility, and toughness. 
  3. Whether you need tubes for a lightweight structure or a heavy-duty construction, we have a steel grade that fits your needs. 
  4. With PandaPipe, you can choose the steel grade that best matches your project requirements.

Production Tolerance of JIS G3444

Classification Tolerances on wall thickness
Seamless steel tube Other than seamless steel tube
Class 1 < 4mm +0.6mm -0.5mm ≥4mm +15% -12.5% < 4mm +0.6mm -0.5mm ≥4mm +15% -12.5% < 12mm -12.5% ≥12mm +15% -1.5mm
Class 2 < 3mm[0.3% ≥3mm [10% < 3mm [0.3% ≥3mm [10% < 12mm[10% ≥12mm +10% -1.2mm

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